1
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Byun J, Pal A, Ko J, Sitti M. Integrated mechanical computing for autonomous soft machines. Nat Commun 2024; 15:2933. [PMID: 38575563 PMCID: PMC10995184 DOI: 10.1038/s41467-024-47201-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2023] [Accepted: 03/25/2024] [Indexed: 04/06/2024] Open
Abstract
Mechanical computing offers a new modality to formulate computational autonomy in intelligent matter or machines without any external powering or active elements. Transition (or solitary) waves, induced by nonreciprocity in mechanical metamaterials comprising a chain of bistable elements, have proven to be a key ingredient for dissipation-free transmission and computation of mechanical information. However, advanced processing of mechanical information in existing designs is hindered by its dissipation when interacting with networked logic gates. Here, we present a metamaterial design strategy that allows non-dispersive mechanical solitary waves to compute multi-level cascaded logic functions, termed 'integrated mechanical computing', by propagating through a network of structurally heterogeneous computing units. From a perspective of characteristic potential energy, we establish an analytical framework that helps in understanding the solitary wave-based mechanical computation, and governs the mechanical design of key determinants for realizing cascaded logic computation, such as soliton profile and logic elements. The developed integrated mechanical computing systems are shown to receive, transmit and compute mechanical information to actuate intelligent soft machine prototypes in a seamless and integrated manner. These findings would pave the way for future intelligent robots and machines that perform computational operations between various non-electrical environmental inputs.
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Affiliation(s)
- Junghwan Byun
- Physical Intelligence Department, Max Planck Institute for Intelligent Systems, 70569, Stuttgart, Germany
- Soft Hybrid Materials Research Center, Korea Institute of Science and Technology, 02792, Seoul, Republic of Korea
| | - Aniket Pal
- Physical Intelligence Department, Max Planck Institute for Intelligent Systems, 70569, Stuttgart, Germany
- Institute of Applied Mechanics, University of Stuttgart, 70569, Stuttgart, Germany
| | - Jongkuk Ko
- Physical Intelligence Department, Max Planck Institute for Intelligent Systems, 70569, Stuttgart, Germany
- Department of Chemical and Biological Engineering, Gachon University, Gyeonggi-do, 13120, Republic of Korea
| | - Metin Sitti
- Physical Intelligence Department, Max Planck Institute for Intelligent Systems, 70569, Stuttgart, Germany.
- Institute for Biomedical Engineering, ETH Zürich, 8092, Zürich, Switzerland.
- School of Medicine and College of Engineering, Koç University, 34450, Istanbul, Turkey.
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2
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Zhang M, Lee Y, Zheng Z, Khan MTA, Lyu X, Byun J, Giessen H, Sitti M. Micro- and nanofabrication of dynamic hydrogels with multichannel information. Nat Commun 2023; 14:8208. [PMID: 38081820 PMCID: PMC10713606 DOI: 10.1038/s41467-023-43921-9] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2023] [Accepted: 11/23/2023] [Indexed: 04/28/2024] Open
Abstract
Creating micro/nanostructures containing multi-channel information within responsive hydrogels presents exciting opportunities for dynamically changing functionalities. However, fabricating these structures is immensely challenging due to the soft and dynamic nature of hydrogels, often resulting in unintended structural deformations or destruction. Here, we demonstrate that dehydrated hydrogels, treated by a programmable femtosecond laser, can allow for a robust fabrication of micro/nanostructures. The dehydration enhances the rigidity of the hydrogels and temporarily locks the dynamic behaviours, significantly promoting their structural integrity during the fabrication process. By utilizing versatile dosage domains of the femtosecond laser, we create micro-grooves on the hydrogel surface through the use of a high-dosage mode, while also altering the fluorescent intensity within the rest of the non-ablated areas via a low-dosage laser. In this way, we rationally design a pixel unit containing three-channel information: structural color, polarization state, and fluorescent intensity, and encode three complex image information sets into these channels. Distinct images at the same location were simultaneously printed onto the hydrogel, which can be observed individually under different imaging modes without cross-talk. Notably, the recovered dynamic responsiveness of the hydrogel enables a multi-information-encoded surface that can sequentially display different information as the temperature changes.
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Affiliation(s)
- Mingchao Zhang
- Physical Intelligence Department, Max Planck Institute for Intelligent Systems, 70569, Stuttgart, Germany
| | - Yohan Lee
- 4th Physics Institute and Research Center SCoPE, University of Stuttgart, 70569, Stuttgart, Germany
| | - Zhiqiang Zheng
- Physical Intelligence Department, Max Planck Institute for Intelligent Systems, 70569, Stuttgart, Germany
| | - Muhammad Turab Ali Khan
- Physical Intelligence Department, Max Planck Institute for Intelligent Systems, 70569, Stuttgart, Germany
| | - Xianglong Lyu
- Physical Intelligence Department, Max Planck Institute for Intelligent Systems, 70569, Stuttgart, Germany
- Institute for Biomedical Engineering, ETH Zürich, 8092, Zürich, Switzerland
| | - Junghwan Byun
- Physical Intelligence Department, Max Planck Institute for Intelligent Systems, 70569, Stuttgart, Germany
| | - Harald Giessen
- 4th Physics Institute and Research Center SCoPE, University of Stuttgart, 70569, Stuttgart, Germany
| | - Metin Sitti
- Physical Intelligence Department, Max Planck Institute for Intelligent Systems, 70569, Stuttgart, Germany.
- Institute for Biomedical Engineering, ETH Zürich, 8092, Zürich, Switzerland.
- School of Medicine and College of Engineering, Koç University, 34450, Istanbul, Turkey.
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3
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King N, Rivera D, Cunningham S, Pickett W, Harkness K, McNevin SH, Milanovic M, Byun J, Khanna A, Atkinson J, Saunders KEA, Duffy A. Mental health and academic outcomes over the first year at university in international compared to domestic Canadian students. J Am Coll Health 2023; 71:2663-2672. [PMID: 34606410 DOI: 10.1080/07448481.2021.1982950] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/22/2021] [Revised: 07/20/2021] [Accepted: 09/13/2021] [Indexed: 06/13/2023]
Abstract
OBJECTIVE To compare risk factors and associated mental health and academic outcomes between international and domestic students. PARTICIPANTS Canadian university undergraduate students. METHODS Electronic surveys were completed at university entry and the end of first year. Surveys assessed demographics, risk factors, symptoms of mental disorders, and access to support. Academic outcomes were obtained from university databases. RESULTS International students had comparable or lower rates of clinically significant anxiety, depression, and insomnia. Domestic female students reported the highest screening rates for common mental disorders. However, international students were more likely to report having attempted suicide. International students felt less connected to the university community and had lower academic performance. Psychosocial risk factor profiles and proportions accessing mental health services were similar. CONCLUSIONS The scope of mental health need appears more similar than different between international and domestic students; however, international students may benefit from targeted academic and social support initiatives.
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Affiliation(s)
- N King
- Department of Public Health Sciences, Queen's University, Kingston, ON, Canada
| | - D Rivera
- Department of Pharmacology and Toxicology, University of Toronto, Toronto, ON, Canada
| | - S Cunningham
- Department of Psychology, Queen's University, Kingston, ON, Canada
| | - W Pickett
- Department of Public Health Sciences, Queen's University, Kingston, ON, Canada
| | - K Harkness
- Department of Psychology, Queen's University, Kingston, ON, Canada
| | - S H McNevin
- Department of Psychiatry, Division of Student Mental Health, Queen's University, Kingston, ON, Canada
| | - M Milanovic
- Department of Psychology, Queen's University, Kingston, ON, Canada
| | - J Byun
- Faculty of Health Sciences, Queen's University, Kingston, ON, Canada
| | - A Khanna
- Student Wellness Services, Queen's University, Kingston, ON, Canada
| | - J Atkinson
- Faculty of Arts and Science, Queen's University, Kingston, ON, Canada
| | - K E A Saunders
- Department of Psychiatry, University of Oxford, Oxford, United Kingdom
| | - A Duffy
- Department of Psychiatry, Division of Student Mental Health, Queen's University, Kingston, ON, Canada
- Department of Psychiatry, University of Oxford, Oxford, United Kingdom
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4
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Li M, Pal A, Byun J, Gardi G, Sitti M. Magnetic Putty as a Reconfigurable, Recyclable, and Accessible Soft Robotic Material. Adv Mater 2023; 35:e2304825. [PMID: 37713134 DOI: 10.1002/adma.202304825] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/22/2023] [Revised: 08/31/2023] [Indexed: 09/16/2023]
Abstract
Magnetically hard materials are widely used to build soft magnetic robots, providing large magnetic force/torque and macrodomain programmability. However, their high magnetic coercivity often presents practical challenges when attempting to reconfigure magnetization patterns, requiring a large magnetic field or heating. In this study, magnetic putty is introduced as a magnetically hard and soft material with large remanence and low coercivity. It is shown that the magnetization of magnetic putty can be easily reoriented with maximum magnitude using an external field that is only one-tenth of its coercivity. Additionally, magnetic putty is a malleable, autonomous self-healing material that can be recycled and repurposed. The authors anticipate magnetic putty could provide a versatile and accessible tool for various magnetic robotics applications for fast prototyping and explorations for research and educational purposes.
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Affiliation(s)
- Meng Li
- Department of Physical Intelligence, Max Planck Institute for Intelligent Systems, 70569, Stuttgart, Germany
- Department of Civil and Environmental Engineering, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA
| | - Aniket Pal
- Department of Physical Intelligence, Max Planck Institute for Intelligent Systems, 70569, Stuttgart, Germany
- Institute of Applied Mechanics, University of Stuttgart, 70569, Stuttgart, Germany
| | - Junghwan Byun
- Department of Physical Intelligence, Max Planck Institute for Intelligent Systems, 70569, Stuttgart, Germany
| | - Gaurav Gardi
- Department of Physical Intelligence, Max Planck Institute for Intelligent Systems, 70569, Stuttgart, Germany
| | - Metin Sitti
- Department of Physical Intelligence, Max Planck Institute for Intelligent Systems, 70569, Stuttgart, Germany
- Institute for Biomedical Engineering, ETH Zürich, Zürich, 8092, Switzerland
- School of Medicine and College of Engineering, Koç University, Istanbul, 34450, Turkey
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Kim Y, Ko J, Byun J, Seo J, Park B. Passivation effect on Cd 0.95Mn 0.05Te 0.98Se 0.02 radiation detection performance. Appl Radiat Isot 2023; 200:110914. [PMID: 37423060 DOI: 10.1016/j.apradiso.2023.110914] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2022] [Revised: 06/25/2023] [Accepted: 06/25/2023] [Indexed: 07/11/2023]
Abstract
CdTe-based detectors have the problem of Te-rich surface layers caused by Br etching, which is one of fabrication steps. Te-rich layer acts as a trapping center and serves as an additional source of charge carriers, thereby degrading transport property of charge carriers and enriching leakage current on surface of detector. To solve this problem, we introduced sodium hypochlorite (NaOCl) as a passivant, and investigated its effect on Cd0.95Mn0.05Te0.98Se0.02 (CMTS), by analyzing chemical state of surface and its performance. After passivation with NaOCl, the results of X-ray photoelectron spectroscopy (XPS) shows the formation of tellurium oxide and elimination of water on CMTS surface, and CMTS presented enhanced performance with Am-241 radioisotope. Consequently, it is demonstrated that the passivation with NaOCl reduces leakage current, compensates defect, and elevates transport of charge carriers, thereby decreasing charge loss of carriers and improving performance of CMTS detector.
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Affiliation(s)
- Y Kim
- Marine Radioactivity Monitoring Group, Korea Marine Environment Management Corporation, Busan 48931, Republic of Korea; Interdisciplinary Program in Precision Public Health, Korea university, Seoul 02841, Republic of Korea
| | - J Ko
- Department of Chemistry, Konkuk University, Seoul 05029, Republic of Korea
| | - J Byun
- Interdisciplinary Program in Precision Public Health, Korea university, Seoul 02841, Republic of Korea; Department of Health and Safety Convergence Science, Korea university, Seoul 02841, Republic of Korea
| | - J Seo
- Interdisciplinary Program in Precision Public Health, Korea university, Seoul 02841, Republic of Korea; Department of Health and Safety Convergence Science, Korea university, Seoul 02841, Republic of Korea
| | - B Park
- Interdisciplinary Program in Precision Public Health, Korea university, Seoul 02841, Republic of Korea; Department of Health and Safety Convergence Science, Korea university, Seoul 02841, Republic of Korea; Advanced Crystal Material/Device Research Center, Konkuk University, Seoul 143-701, Republic of Korea.
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6
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Byun J, Kim Y, Seo J, Kim E, Kim K, Jo A, Lee W, Park B. Development and evaluation of photon-counting Cd 0.875Zn 0.125Te 0.98Se 0.02 detector for measuring bone mineral density. Phys Eng Sci Med 2023; 46:245-253. [PMID: 36592283 DOI: 10.1007/s13246-022-01213-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2022] [Accepted: 12/21/2022] [Indexed: 01/03/2023]
Abstract
Cadmium zinc telluride (CZT) has been actively researched and developed by researchers in various fields. In medical applications, especially photon-counting, CZT enables improved image quality, multi-material decomposition, and improved dose efficiency. Moreover, band gap engineering and selenium addition on CZT improved electrical, spectroscopic and structural properties, thereby supporting performance of CZT as a photon-counting detector. In this study, it is shown that Cd0.875Zn0.125Te0.98Se0.02 (CZTS) shows sufficient performance without loss of detection efficiency. We carried out a study involving the application of this CZTS on calculating bone mineral density (BMD) values, because this application has a novelty of new material for BMD sensor which follows the CdTe- or CdZnTe- based BMD detector. Anatomical images from different energy bins contained different information of attenuation although the images were taken in the same region at the same time. Moreover, calculated BMD values had a proper tendency depending on the amount of bone in that region. The final BMD value was 1.1972 g/cm2, which is close to the real value of 1.2 g/cm2. The introduction with a bone filter and a smaller pixel size will improve the accuracy and precision of photon-counting CZTS detectors for measuring BMD values. However, in this study the CZTS showed the feasibility that a photon-counting CZTS detector can help the measurement of BMD values and the diagnosis of osteoporosis.
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Affiliation(s)
- J Byun
- Department of Health and Safety Convergence Science, Korea University, Seoul, 02841, Korea
- Interdisciplinary Program in Precision Public Health, Korea University, Seoul, 02841, Korea
| | - Y Kim
- Interdisciplinary Program in Precision Public Health, Korea University, Seoul, 02841, Korea
- Marine Radioactivity Monitoring Group, Korea Marine Environment Management Corporation, Busan, 48931, Korea
| | - J Seo
- Department of Health and Safety Convergence Science, Korea University, Seoul, 02841, Korea
- Interdisciplinary Program in Precision Public Health, Korea University, Seoul, 02841, Korea
| | - E Kim
- Department of Health and Safety Convergence Science, Korea University, Seoul, 02841, Korea
| | - K Kim
- Department of Health and Environmental Science, Korea University, Seoul, 02841, Korea
| | - A Jo
- Health Science Research Center, Korea University, Seoul, 02841, Korea
| | - W Lee
- Department of Health and Environmental Science, Korea University, Seoul, 02841, Korea
- Graduate School, Transdisciplinary Major in Learning Health Systems, Korea University, Seoul, 02841, Korea
| | - B Park
- Department of Health and Safety Convergence Science, Korea University, Seoul, 02841, Korea.
- Interdisciplinary Program in Precision Public Health, Korea University, Seoul, 02841, Korea.
- Liquid Crystals Research Center, Konkuk University, Seoul, 05029, Korea.
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7
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Byun J, Seo J, Seo J, Park B. Growth and characterization of detector-grade CdMnTeSe. Nuclear Engineering and Technology 2022. [DOI: 10.1016/j.net.2022.06.007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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8
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Park B, Kim Y, Seo J, Byun J, Kim K. Passivation effect on large volume CdZnTe crystals. Nuclear Engineering and Technology 2022. [DOI: 10.1016/j.net.2022.06.005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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9
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Park MJ, Kim W, Yu SY, Cho J, Kang W, Byun J, Jeong U, Cho K. Deployable Soft Origami Modular Robotic Arm With Variable Stiffness Using Facet Buckling. IEEE Robot Autom Lett 2022. [DOI: 10.1109/lra.2022.3232267] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Affiliation(s)
- Min Jo Park
- Biorobotics Laboratory, Soft Robotics Research Center, Department of Mechanical Engineering, Institute of Engineering Seoul National University, Seoul, Republic of Korea
| | - Woongbae Kim
- Biorobotics Laboratory, Soft Robotics Research Center, Department of Mechanical Engineering, Institute of Engineering Seoul National University, Seoul, Republic of Korea
| | - Sung-Yol Yu
- Biorobotics Laboratory, Soft Robotics Research Center, Department of Mechanical Engineering, Institute of Engineering Seoul National University, Seoul, Republic of Korea
| | - Jungmin Cho
- Biorobotics Laboratory, Soft Robotics Research Center, Department of Mechanical Engineering, Institute of Engineering Seoul National University, Seoul, Republic of Korea
| | - Wonkyeong Kang
- Biorobotics Laboratory, Soft Robotics Research Center, Department of Mechanical Engineering, Institute of Engineering Seoul National University, Seoul, Republic of Korea
| | - Junghwan Byun
- Physical Intelligence Department, Max Planck Institute for Intelligent Systems, Stuttgart, Germany
| | - Useok Jeong
- Robotics R&D Department, Korea Institute of Industrial Technology(KITECH), University of Science & Technology (UST), and HYU-KITECH, Ansan-si, Republic of Korea
| | - Kyujin Cho
- Biorobotics Laboratory, Soft Robotics Research Center, Department of Mechanical Engineering, Institute of Engineering Seoul National University, Seoul, Republic of Korea
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10
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Hwang H, An H, Lee S, Byun J. LB784 Anticancer activity of Ramalin isolated from ramalina terebrata on human Squamous Cell Carcinoma in vitro and in vivo. J Invest Dermatol 2021. [DOI: 10.1016/j.jid.2021.07.048] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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11
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Byun J, Park M, Baek SM, Yoon J, Kim W, Lee B, Hong Y, Cho KJ. Underwater maneuvering of robotic sheets through buoyancy-mediated active flutter. Sci Robot 2021; 6:6/53/eabe0637. [PMID: 34043564 DOI: 10.1126/scirobotics.abe0637] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2020] [Accepted: 03/30/2021] [Indexed: 01/09/2023]
Abstract
Falling leaves flutter from side to side due to passive and intrinsic fluid-body coupling. Exploiting the dynamics of passive fluttering could lead to fresh perspectives for the locomotion and manipulation of thin, planar objects in fluid environments. Here, we show that the time-varying density distribution within a thin, planar body effectively elicits minimal momentum control to reorient the principal flutter axis and propel itself via directional fluttery motions. We validated the principle by developing a swimming leaf with a soft skin that can modulate local buoyancy distributions for active flutter dynamics. To show generality and field applicability, we demonstrated underwater maneuvering and manipulation of adhesive and oil-skimming sheets for environmental remediation. These findings could inspire future intelligent underwater robots and manipulation schemes.
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Affiliation(s)
- Junghwan Byun
- Soft Robotics Research Center, Seoul National University, Seoul, Republic of Korea.,Biorobotics Lab, Department of Mechanical Engineering, Institute of Advanced Machines and Design, Institute of Engineering Research, Seoul National University, Seoul, Republic of Korea.,Physical Intelligence Department, Max Planck Institute for Intelligent Systems, Stuttgart, Germany
| | - Minjo Park
- Soft Robotics Research Center, Seoul National University, Seoul, Republic of Korea.,Biorobotics Lab, Department of Mechanical Engineering, Institute of Advanced Machines and Design, Institute of Engineering Research, Seoul National University, Seoul, Republic of Korea
| | - Sang-Min Baek
- Soft Robotics Research Center, Seoul National University, Seoul, Republic of Korea.,Biorobotics Lab, Department of Mechanical Engineering, Institute of Advanced Machines and Design, Institute of Engineering Research, Seoul National University, Seoul, Republic of Korea
| | - Jaeyoung Yoon
- Department of Electrical and Computer Engineering, Inter-university Semiconductor Research Center, Seoul National University, Seoul, Republic of Korea
| | - Woongbae Kim
- Soft Robotics Research Center, Seoul National University, Seoul, Republic of Korea.,Biorobotics Lab, Department of Mechanical Engineering, Institute of Advanced Machines and Design, Institute of Engineering Research, Seoul National University, Seoul, Republic of Korea
| | - Byeongmoon Lee
- Department of Electrical and Computer Engineering, Inter-university Semiconductor Research Center, Seoul National University, Seoul, Republic of Korea
| | - Yongtaek Hong
- Department of Electrical and Computer Engineering, Inter-university Semiconductor Research Center, Seoul National University, Seoul, Republic of Korea
| | - Kyu-Jin Cho
- Soft Robotics Research Center, Seoul National University, Seoul, Republic of Korea. .,Biorobotics Lab, Department of Mechanical Engineering, Institute of Advanced Machines and Design, Institute of Engineering Research, Seoul National University, Seoul, Republic of Korea
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12
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Byun J, Lee Y, Yoon J, Lee B, Oh E, Chung S, Lee T, Cho KJ, Kim J, Hong Y. Electronic skins for soft, compact, reversible assembly of wirelessly activated fully soft robots. Sci Robot 2021; 3:3/18/eaas9020. [PMID: 33141703 DOI: 10.1126/scirobotics.aas9020] [Citation(s) in RCA: 81] [Impact Index Per Article: 27.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2018] [Accepted: 04/20/2018] [Indexed: 11/02/2022]
Abstract
Designing softness into robots holds great potential for augmenting robotic compliance in dynamic, unstructured environments. However, despite the body's softness, existing models mostly carry inherent hardness in their driving parts, such as pressure-regulating components and rigid circuit boards. This compliance gap can frequently interfere with the robot motion and makes soft robotic design dependent on rigid assembly of each robot component. We present a skin-like electronic system that enables a class of wirelessly activated fully soft robots whose driving part can be softly, compactly, and reversibly assembled. The proposed system consists of two-part electronic skins (e-skins) that are designed to perform wireless communication of the robot control signal, namely, "wireless inter-skin communication," for untethered, reversible assembly of driving capability. The physical design of each e-skin features minimized inherent hardness in terms of thickness (<1 millimeter), weight (~0.8 gram), and fragmented circuit configuration. The developed e-skin pair can be softly integrated into separate soft body frames (robot and human), wirelessly interact with each other, and then activate and control the robot. The e-skin-integrated robotic design is highly compact and shows that the embedded e-skin can equally share the fine soft motions of the robot frame. Our results also highlight the effectiveness of the wireless inter-skin communication in providing universality for robotic actuation based on reversible assembly.
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Affiliation(s)
- Junghwan Byun
- Department of Electrical and Computer Engineering, Inter-University Semiconductor Research Center, Seoul National University, Seoul, Republic of Korea.,Department of Mechanical and Aerospace Engineering, Institute of Advanced Machines and Design, Seoul National University, Seoul, Republic of Korea.,Soft Robotics Research Center, Seoul National University, Seoul, Republic of Korea
| | - Yoontaek Lee
- Department of Electrical and Computer Engineering, Inter-University Semiconductor Research Center, Seoul National University, Seoul, Republic of Korea
| | - Jaeyoung Yoon
- Department of Electrical and Computer Engineering, Inter-University Semiconductor Research Center, Seoul National University, Seoul, Republic of Korea
| | - Byeongmoon Lee
- Department of Electrical and Computer Engineering, Inter-University Semiconductor Research Center, Seoul National University, Seoul, Republic of Korea
| | - Eunho Oh
- Department of Electrical and Computer Engineering, Inter-University Semiconductor Research Center, Seoul National University, Seoul, Republic of Korea
| | - Seungjun Chung
- Photoelectronic Hybrids Research Center, Korea Institute of Science and Technology, Seoul, Republic of Korea
| | - Takhee Lee
- Department of Physics and Astronomy, Seoul National University, Seoul, Republic of Korea
| | - Kyu-Jin Cho
- Department of Mechanical and Aerospace Engineering, Institute of Advanced Machines and Design, Seoul National University, Seoul, Republic of Korea. .,Soft Robotics Research Center, Seoul National University, Seoul, Republic of Korea
| | - Jaeha Kim
- Department of Electrical and Computer Engineering, Inter-University Semiconductor Research Center, Seoul National University, Seoul, Republic of Korea.
| | - Yongtaek Hong
- Department of Electrical and Computer Engineering, Inter-University Semiconductor Research Center, Seoul National University, Seoul, Republic of Korea.
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13
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Kim D, Shin W, Byun J. 1197 Utility of Fitbit Charge 2 for Sleep Monitoring in Patients With Obstructive Sleep Apnea. Sleep 2020. [DOI: 10.1093/sleep/zsaa056.1191] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Abstract
Introduction
The wearable device may be useful in monitoring sleep. Many studies reported reliable data in detecting sleep-wake states and sleep stage proportion in healthy adults, However, only a few validation studies were performed evaluating sleep using the wearable devices in patients with obstructive sleep apnea(OSA), which showed insufficient accuracy. We aimed to evaluate the reliability of multi-sensory wristband (Fitbit Charge 2) in patients with OSA.
Methods
This was a preliminary analysis of a prospective single-center observational study. Consecutive patients underwent standard Polysomnography (PSG) for evaluation of OSA with Fitbit Charge 2. Sleep data from PSG and Fitbit charge 2 were compared using paired t-tests and Bland-Altman plots.
Results
A total of eighty-six patients were analyzed. Four of them had poor data quality, 18 of them did not show sleep stages. Compared with the PSG, Fitbit Charge 2 showed higher total sleep time (419.1±194.0 vs 269.8±22.6, p<0.001) and sleep efficiency (95.8±2.5 vs 84.6±7.1, p<0.001). Those with sleep stage data showed higher sleep efficacy (87.7±5.5 vs 82.37.5, p=0.024) and a lower proportion of N1 sleep (33.7±19.9 vs 65.3±38.8, p=0.01).
Conclusion
Fitbit Charge 2 showed limited utility in monitoring sleep in patients with obstructive sleep apnea.
Support
none
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Affiliation(s)
- D Kim
- KyungHee University Hospital at Gangdong, Seoul, KOREA, REPUBLIC OF
| | - W Shin
- KyungHee University Hospital at Gangdong, Seoul, KOREA, REPUBLIC OF
| | - J Byun
- KyungHee University Hospital at Gangdong, Seoul, KOREA, REPUBLIC OF
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Lee B, Oh JY, Cho H, Joo CW, Yoon H, Jeong S, Oh E, Byun J, Kim H, Lee S, Seo J, Park CW, Choi S, Park NM, Kang SY, Hwang CS, Ahn SD, Lee JI, Hong Y. Ultraflexible and transparent electroluminescent skin for real-time and super-resolution imaging of pressure distribution. Nat Commun 2020; 11:663. [PMID: 32005935 PMCID: PMC6994701 DOI: 10.1038/s41467-020-14485-9] [Citation(s) in RCA: 48] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2019] [Accepted: 01/03/2020] [Indexed: 11/16/2022] Open
Abstract
The ability to image pressure distribution over complex three-dimensional surfaces would significantly augment the potential applications of electronic skin. However, existing methods show poor spatial and temporal fidelity due to their limited pixel density, low sensitivity, or low conformability. Here, we report an ultraflexible and transparent electroluminescent skin that autonomously displays super-resolution images of pressure distribution in real time. The device comprises a transparent pressure-sensing film with a solution-processable cellulose/nanowire nanohybrid network featuring ultrahigh sensor sensitivity (>5000 kPa-1) and a fast response time (<1 ms), and a quantum dot-based electroluminescent film. The two ultrathin films conform to each contact object and transduce spatial pressure into conductivity distribution in a continuous domain, resulting in super-resolution (>1000 dpi) pressure imaging without the need for pixel structures. Our approach provides a new framework for visualizing accurate stimulus distribution with potential applications in skin prosthesis, robotics, and advanced human-machine interfaces.
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Affiliation(s)
- Byeongmoon Lee
- Department of Electrical and Computer Engineering, Inter-University Semiconductor Research Center (ISRC), Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul, 08826, Republic of Korea
| | - Ji-Young Oh
- Reality Device Research Division, ICT Materials & Components & Research Laboratory, Electronics & Telecommunications Research Institute (ETRI), Daejeon, 34129, Republic of Korea.
| | - Hyeon Cho
- Department of Electrical and Computer Engineering, Inter-University Semiconductor Research Center (ISRC), Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul, 08826, Republic of Korea
| | - Chul Woong Joo
- Reality Device Research Division, ICT Materials & Components & Research Laboratory, Electronics & Telecommunications Research Institute (ETRI), Daejeon, 34129, Republic of Korea
| | - Hyungsoo Yoon
- Department of Electrical and Computer Engineering, Inter-University Semiconductor Research Center (ISRC), Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul, 08826, Republic of Korea
| | - Sujin Jeong
- Department of Electrical and Computer Engineering, Inter-University Semiconductor Research Center (ISRC), Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul, 08826, Republic of Korea
| | - Eunho Oh
- Department of Electrical and Computer Engineering, Inter-University Semiconductor Research Center (ISRC), Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul, 08826, Republic of Korea
| | - Junghwan Byun
- Department of Mechanical and Aerospace Engineering, Institute of Advanced Machines and Design, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul, 08826, Republic of Korea
- Soft Robotics Research Center (SRRC), Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul, 08826, Republic of Korea
| | - Hanul Kim
- Department of Electrical and Computer Engineering, Inter-University Semiconductor Research Center (ISRC), Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul, 08826, Republic of Korea
| | - Seunghwan Lee
- Department of Electrical and Computer Engineering, Inter-University Semiconductor Research Center (ISRC), Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul, 08826, Republic of Korea
| | - Jiseok Seo
- Department of Electrical and Computer Engineering, Inter-University Semiconductor Research Center (ISRC), Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul, 08826, Republic of Korea
| | - Chan Woo Park
- Reality Device Research Division, ICT Materials & Components & Research Laboratory, Electronics & Telecommunications Research Institute (ETRI), Daejeon, 34129, Republic of Korea
| | - Sukyung Choi
- Reality Device Research Division, ICT Materials & Components & Research Laboratory, Electronics & Telecommunications Research Institute (ETRI), Daejeon, 34129, Republic of Korea
| | - Nae-Man Park
- Reality Device Research Division, ICT Materials & Components & Research Laboratory, Electronics & Telecommunications Research Institute (ETRI), Daejeon, 34129, Republic of Korea
| | - Seung-Youl Kang
- Reality Device Research Division, ICT Materials & Components & Research Laboratory, Electronics & Telecommunications Research Institute (ETRI), Daejeon, 34129, Republic of Korea
| | - Chi-Sun Hwang
- Reality Device Research Division, ICT Materials & Components & Research Laboratory, Electronics & Telecommunications Research Institute (ETRI), Daejeon, 34129, Republic of Korea
| | - Seong-Deok Ahn
- Reality Device Research Division, ICT Materials & Components & Research Laboratory, Electronics & Telecommunications Research Institute (ETRI), Daejeon, 34129, Republic of Korea
| | - Jeong-Ik Lee
- Reality Device Research Division, ICT Materials & Components & Research Laboratory, Electronics & Telecommunications Research Institute (ETRI), Daejeon, 34129, Republic of Korea
| | - Yongtaek Hong
- Department of Electrical and Computer Engineering, Inter-University Semiconductor Research Center (ISRC), Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul, 08826, Republic of Korea.
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Kim W, Byun J, Kim JK, Choi WY, Jakobsen K, Jakobsen J, Lee DY, Cho KJ. Bioinspired dual-morphing stretchable origami. Sci Robot 2019; 4:4/36/eaay3493. [DOI: 10.1126/scirobotics.aay3493] [Citation(s) in RCA: 68] [Impact Index Per Article: 13.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2019] [Accepted: 10/09/2019] [Indexed: 01/30/2023]
Abstract
Nature demonstrates adaptive and extreme shape morphing via unique patterns of movement. Many of them have been explained by monolithic shape-changing mechanisms, such as chemical swelling, skin stretching, origami/kirigami morphing, or geometric eversion, that were successfully mimicked in artificial analogs. However, there still remains an unexplored regime of natural morphing that cannot be reproduced in artificial systems by a “single-mode” morphing mechanism. One example is the “dual-mode” morphing of Eurypharynx pelecanoides (commonly known as the pelican eel), which first unfolds and then inflates its mouth to maximize the probability of engulfing the prey. Here, we introduce pelican eel–inspired dual-morphing architectures that embody quasi-sequential behaviors of origami unfolding and skin stretching in response to fluid pressure. In the proposed system, fluid paths were enclosed and guided by a set of entirely stretchable origami units that imitate the morphing principle of the pelican eel’s stretchable and foldable frames. This geometric and elastomeric design of fluid networks, in which fluid pressure acts in the direction that the whole body deploys first, resulted in a quasi-sequential dual-morphing response. To verify the effectiveness of our design rule, we built an artificial creature mimicking a pelican eel and reproduced biomimetic dual-morphing behavior. By compositing the basic dual-morphing unit cells into conventional origami frames, we demonstrated architectures of soft machines that exhibit deployment-combined adaptive gripping, crawling, and large range of underwater motion. This design principle may provide guidance for designing bioinspired, adaptive, and extreme shape-morphing systems.
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Byun J, Han Y, Edelson J, Ostrom Q, Amos C. P1.11-05 Genetic Architecture of Lung Cancer Using Machine-Learning Approaches in Genome-Wide Association Studies. J Thorac Oncol 2019. [DOI: 10.1016/j.jtho.2019.08.1078] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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17
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Wang S, Jhawar S, Rivera-Nunez Z, Byun J, Parikh R, Weiner J, Goyal S. Association of Radiation Dose-Fractionation and Immunotherapy Use with Overall Survival in Metastatic Melanoma Patients. Int J Radiat Oncol Biol Phys 2019. [DOI: 10.1016/j.ijrobp.2019.06.529] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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18
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Rooney M, Sachdev S, Byun J, Jagsi R, Golden D. Readability of Online Patient Education Materials in Radiation Oncology – Are We Improving? Int J Radiat Oncol Biol Phys 2019. [DOI: 10.1016/j.ijrobp.2019.06.304] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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19
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Yoon J, Joo Y, Oh E, Lee B, Kim D, Lee S, Kim T, Byun J, Hong Y. Soft Modular Electronic Blocks (SMEBs): A Strategy for Tailored Wearable Health-Monitoring Systems. Adv Sci (Weinh) 2019; 6:1801682. [PMID: 30886798 PMCID: PMC6402283 DOI: 10.1002/advs.201801682] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/27/2018] [Revised: 11/15/2018] [Indexed: 05/09/2023]
Abstract
Precise monitoring of human body signals can be achieved by soft, conformal contact and precise arrangement of wearable devices to the desired body positions. So far, no design and fabrication methodology in soft wearable devices is able to address the variations in the form factor of the human body such as the various sizes and shapes of individual body parts, which can significantly cause misalignments and the corresponding inaccurate monitoring. Here, a concept of soft modular electronic blocks (SMEBs) enabling the assembly of soft wearable systems onto human skin with functions and layouts tailored to the form factors of individuals' bodies is presented. Three types of SMEBs are developed as fundamental building blocks for functional modularization. The physical design of SMEBs is optimized for a mechanically stable island-bridge configuration. The prepared SMEBs can be integrated onto a target body part through rapid, room-temperature (RT) assembly (<5 s) using an oxygen plasma-induced siloxane bonding method. A soft metacarpophalangeal (MP) joints flexion monitoring system that is tailored to allow for accurate monitoring for multiple individuals with unique joint and hand sizes is demonstrated.
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Affiliation(s)
- Jaeyoung Yoon
- Department of Electrical and Computer EngineeringInter University Semiconductor Research Center (ISRC)Seoul National UniversitySeoul08826Republic of Korea
| | - Yunsik Joo
- Department of Electrical and Computer EngineeringInter University Semiconductor Research Center (ISRC)Seoul National UniversitySeoul08826Republic of Korea
| | - Eunho Oh
- Department of Electrical and Computer EngineeringInter University Semiconductor Research Center (ISRC)Seoul National UniversitySeoul08826Republic of Korea
| | - Byeongmoon Lee
- Department of Electrical and Computer EngineeringInter University Semiconductor Research Center (ISRC)Seoul National UniversitySeoul08826Republic of Korea
| | - Daesik Kim
- Department of Electrical and Computer EngineeringInter University Semiconductor Research Center (ISRC)Seoul National UniversitySeoul08826Republic of Korea
| | - Seunghwan Lee
- Department of Electrical and Computer EngineeringInter University Semiconductor Research Center (ISRC)Seoul National UniversitySeoul08826Republic of Korea
| | - Taehoon Kim
- Department of Electrical and Computer EngineeringInter University Semiconductor Research Center (ISRC)Seoul National UniversitySeoul08826Republic of Korea
| | - Junghwan Byun
- Department of Mechanical and Aerospace EngineeringInstitute of Advanced Machines and Design (IAMD)Soft Robotics Research Center (SRRC)Seoul National UniversitySeoul08826Republic of Korea
| | - Yongtaek Hong
- Department of Electrical and Computer EngineeringInter University Semiconductor Research Center (ISRC)Seoul National UniversitySeoul08826Republic of Korea
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Byun J, Hathout L, Vergalasova I, Mahmoud O. Number of Implanted Catheters and Dose Homogeneity May Increase Risk for Long-Term Toxicity in Cervical Cancer Patients Treated with Interstitial Brachytherapy: A Single-Institution Analysis. Int J Radiat Oncol Biol Phys 2018. [DOI: 10.1016/j.ijrobp.2018.07.1692] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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21
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Byun J, Haffty B, Ohri N. Patterns of Postmastectomy Radiation in Clinically Node Positive Breast Cancer Patients with Pathologically Negative Lymph Nodes after Neoadjuvant Chemotherapy. Int J Radiat Oncol Biol Phys 2018. [DOI: 10.1016/j.ijrobp.2018.07.1574] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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22
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Yoo H, Gu B, Byun J, Cho Y, Hong S, Kim J, Kim C, Kim Y. P05.42 The natural course of atypical meningioma after gross total resection without adjuvant treatment. Neuro Oncol 2018. [DOI: 10.1093/neuonc/noy139.368] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Affiliation(s)
- H Yoo
- Asan Medical Center, Seoul, Korea, Republic of
| | - B Gu
- Asan Medical Center, Seoul, Korea, Republic of
| | - J Byun
- Asan Medical Center, Seoul, Korea, Republic of
| | - Y Cho
- Asan Medical Center, Seoul, Korea, Republic of
| | - S Hong
- Asan Medical Center, Seoul, Korea, Republic of
| | - J Kim
- Asan Medical Center, Seoul, Korea, Republic of
| | - C Kim
- Asan Medical Center, Seoul, Korea, Republic of
| | - Y Kim
- Asan Medical Center, Seoul, Korea, Republic of
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23
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Paek S, Seok S, Park J, Jeon Y, Byun J, Son S, Lee S, Kim J, Hwang J, Kim J, Lyu S, Kim J, Kwak I, Lee W. Can single good quality frozen-thawed blastocyst transfer augment pregnancy rates in patients with elevated progesterone? Fertil Steril 2018. [DOI: 10.1016/j.fertnstert.2018.07.1034] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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24
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Rajasekharan S, Byun J, Lee J. Inhibitory effects of deoxynivalenol on pathogenesis ofCandida albicans. J Appl Microbiol 2018; 125:1266-1275. [DOI: 10.1111/jam.14032] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2018] [Revised: 06/22/2018] [Accepted: 06/25/2018] [Indexed: 12/11/2022]
Affiliation(s)
- S.K. Rajasekharan
- School of Chemical Engineering; Yeungnam University; Gyeongsan Republic of Korea
| | - J. Byun
- Department of Health Sport; Uiduk University; Gyeongju Republic of Korea
| | - J. Lee
- School of Chemical Engineering; Yeungnam University; Gyeongsan Republic of Korea
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25
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Byun J, Chung S, Hong Y. Artificial Soft Elastic Media with Periodic Hard Inclusions for Tailoring Strain-Sensitive Thin-Film Responses. Adv Mater 2018; 30:e1802190. [PMID: 30133014 DOI: 10.1002/adma.201802190] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/05/2018] [Revised: 07/18/2018] [Indexed: 06/08/2023]
Abstract
Engineering the coupling behavior between a functional thin film and a soft substrate provides an attractive pathway for controlling various properties of thin-film materials. However, existing studies mostly rely on uniform deformation of the substrate, and the effect of well-regulated and nonuniform strain distributions on strain-sensitive thin-film responses still remains elusive. Herein, artificially strain-regulated elastic media are presented as a novel platform for tailoring strain-sensitive thin-film responses. The proposed artificial soft elastic media are composed of embedded arrays of inkjet-printed polymeric strain modulators that exhibit a high modulus contrast with respect to that of the soft matrix. This strain-modulating lattice induces spatially regulated strain distributions based on localized strain-coupling. Controlling the structural parameters and lattice configurations of the media leads to spatial modulation of the microscopically localized as well as macroscopically accumulated strain profiles. Uniform thin films coupled to these media undergo artificially tailored deformation through lattice-like strain-coupled pathways. The resulting phenomena yield programmable strain-sensitive responses such as spatial arrangement of ternary-state surface wrinkles and stepwise tuning of piezoresistive responses. This work will open a new avenue for addressing the issue of controlling strain-sensitive thin-film properties through structural engineering of artificial soft elastic media.
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Affiliation(s)
- Junghwan Byun
- Department of Mechanical and Aerospace Engineering, Institute of Advanced Machines and Design, Soft Robotics Research Center (SRRC), Seoul National University, Seoul, 08826, Republic of Korea
| | - Seungjun Chung
- Photo-Electronic Hybrids Research Center, Korea Institute of Science and Technology (KIST), Seoul, 02792, Republic of Korea
| | - Yongtaek Hong
- Department of Electrical and Computer Engineering, Inter-University Semiconductor Research Center (ISRC), Seoul National University, Seoul, 08826, Republic of Korea
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Pak J, Jang Y, Byun J, Cho K, Kim TY, Kim JK, Choi BY, Shin J, Hong Y, Chung S, Lee T. Two-Dimensional Thickness-Dependent Avalanche Breakdown Phenomena in MoS 2 Field-Effect Transistors under High Electric Fields. ACS Nano 2018; 12:7109-7116. [PMID: 29952557 DOI: 10.1021/acsnano.8b02925] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
As two-dimensional (2D) transition metal dichalcogenides electronic devices are scaled down to the sub-micrometer regime, the active layers of these materials are exposed to high lateral electric fields, resulting in electrical breakdown. In this regard, understanding the intrinsic nature in layer-stacked 2D semiconducting materials under high lateral electric fields is necessary for the reliable applications of their field-effect transistors. Here, we explore the electrical breakdown phenomena originating from avalanche multiplication in MoS2 field-effect transistors with different layer thicknesses and channel lengths. Modulating the band structure and bandgap energy in MoS2 allows the avalanche multiplication to be controlled by adjusting the number of stacking layers. This phenomenon could be observed in transition metal dichalcogenide semiconducting systems due to its quantum confinement effect on the band structure. The relationship between the critical electric field for avalanche breakdown and bandgap energy is well fitted to a power law curve in both monolayer and multilayer MoS2.
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Affiliation(s)
- Jinsu Pak
- Department of Physics and Astronomy, and Institute of Applied Physics , Seoul National University , Seoul 08826 , Korea
| | - Yeonsik Jang
- Department of Physics and Astronomy, and Institute of Applied Physics , Seoul National University , Seoul 08826 , Korea
| | - Junghwan Byun
- Department of Electrical and Computer Engineering , Inter-university Semiconductor Research Center (ISRC), Seoul National University , Seoul 08826 , Korea
| | - Kyungjune Cho
- Department of Physics and Astronomy, and Institute of Applied Physics , Seoul National University , Seoul 08826 , Korea
| | - Tae-Young Kim
- Department of Physics and Astronomy, and Institute of Applied Physics , Seoul National University , Seoul 08826 , Korea
| | - Jae-Keun Kim
- Department of Physics and Astronomy, and Institute of Applied Physics , Seoul National University , Seoul 08826 , Korea
| | - Barbara Yuri Choi
- Department of Physics and Astronomy, and Institute of Applied Physics , Seoul National University , Seoul 08826 , Korea
| | - Jiwon Shin
- Department of Physics and Astronomy, and Institute of Applied Physics , Seoul National University , Seoul 08826 , Korea
| | - Yongtaek Hong
- Department of Electrical and Computer Engineering , Inter-university Semiconductor Research Center (ISRC), Seoul National University , Seoul 08826 , Korea
| | - Seungjun Chung
- Photo-electronic Hybrids Research Center , Korea Institute of Science and Technology (KIST) , Seoul 02792 , Korea
| | - Takhee Lee
- Department of Physics and Astronomy, and Institute of Applied Physics , Seoul National University , Seoul 08826 , Korea
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27
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Byun J, An H, Yeom S, Choi G. 127 NDRG1 regulates proliferation of endothelial cells of infantile hemangioma. J Invest Dermatol 2018. [DOI: 10.1016/j.jid.2018.03.132] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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28
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Shin Y, Byun J, Ahn S, Yang K, Cho Y, Shin W. 0554 Efficacy Of Dental Device For Treatment For Moderate To Severe Obstructive Sleep Apnea In Korean: Interim Result Of Prospective Multi-center Study. Sleep 2018. [DOI: 10.1093/sleep/zsy061.553] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Y Shin
- Kyung-Hee University Hospital at Gangdong, Seoul, KOREA, REPUBLIC OF
| | - J Byun
- Kyung-Hee University Hospital at Gangdong, Seoul, KOREA, REPUBLIC OF
| | - S Ahn
- Kyung-Hee University Hospital at Gangdong, Seoul, KOREA, REPUBLIC OF
| | - K Yang
- SOON CHUN HYANG University Hospital Cheonan, Cheonan, KOREA, REPUBLIC OF
| | - Y Cho
- Keimyung University Dongsan Medical Center, Daegu, KOREA, REPUBLIC OF
| | - W Shin
- Kyung-Hee University Hospital at Gangdong, Seoul, KOREA, REPUBLIC OF
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Cha K, Park J, Koo S, Kim T, Jun J, Byun J, Sunwoo J, Jung K. 0669 Thalamocortical Dysfunction In Patients With Idiopathic Restless Legs Syndrome (RLS) Suggested By Reduced Sleep Spindle Activity. Sleep 2018. [DOI: 10.1093/sleep/zsy061.668] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
- K Cha
- Seoul National University Hospital, Seoul, KOREA, REPUBLIC OF
- Yonsei University, Wonju, KOREA, REPUBLIC OF
| | - J Park
- Seoul National University Hospital, Seoul, KOREA, REPUBLIC OF
| | - S Koo
- Seoul National University Hospital, Seoul, KOREA, REPUBLIC OF
| | - T Kim
- Seoul National University Hospital, Seoul, KOREA, REPUBLIC OF
| | - J Jun
- Seoul National University Hospital, Seoul, KOREA, REPUBLIC OF
| | - J Byun
- Kyung Hee University Hospital at Gangdong, Seoul, KOREA, REPUBLIC OF
| | - J Sunwoo
- Soonchunhyang University College of Medicine, Seoul, KOREA, REPUBLIC OF
| | - K Jung
- Seoul National University Hospital, Seoul, KOREA, REPUBLIC OF
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30
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Chung S, Byun J, Shin Y, Shin W. 0502 Alternative Stop-bang Questionnaire Scoring Criteria To Detect Obstructive Sleep Apnea In Korean Population. Sleep 2018. [DOI: 10.1093/sleep/zsy061.501] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
- S Chung
- Kyung-Hee University Hospital at Gangdong, Seoul, KOREA, REPUBLIC OF
| | - J Byun
- KyungHee University Hospital at Gangdong, Seoul, KOREA, REPUBLIC OF
| | - Y Shin
- KyungHee University Hospital at Gangdong, Seoul, KOREA, REPUBLIC OF
| | - W Shin
- KyungHee University Hospital at Gangdong, Seoul, KOREA, REPUBLIC OF
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31
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Kim T, Cha K, Jun J, Lim J, Byun J, Sunwoo J, Shin J, Han S, Joo E, Jung K. 0674 Intracerebral Sources of Periodic Leg Movement during Sleep. Sleep 2018. [DOI: 10.1093/sleep/zsy061.673] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Affiliation(s)
- T Kim
- Seoul National University Hospital, Seoul, KOREA, REPUBLIC OF
| | - K Cha
- Seoul National University Hospital, Seoul, KOREA, REPUBLIC OF
| | - J Jun
- Seoul National University Hospital, Seoul, KOREA, REPUBLIC OF
| | - J Lim
- Department of Neurology, National Center for Mental Health, Seoul, KOREA, REPUBLIC OF
| | - J Byun
- 2Department of Neurology, Kyung Hee University Hospital at Gangdong, Seoul, KOREA, REPUBLIC OF
| | - J Sunwoo
- Department of Neurology, Soonchunhyang University Seoul Hospital, Seoul, KOREA, REPUBLIC OF
| | - J Shin
- Department of Neurology, CHA Bundang Medical Center, CHA University, Seongnam, KOREA, REPUBLIC OF
| | - S Han
- Department of Neurology, Wonkwang University Sanbon Hospital, Gunpo, KOREA, REPUBLIC OF
| | - E Joo
- Department of Neurology, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, KOREA, REPUBLIC OF
| | - K Jung
- Seoul National University Hospital, Seoul, KOREA, REPUBLIC OF
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Koo JW, Myong JP, Yoon HK, Rhee CK, Kim Y, Kim JS, Jo BS, Cho Y, Byun J, Choi M, Kim HR, Kim EA. Occupational exposure and idiopathic pulmonary fibrosis: a multicentre case-control study in Korea. Int J Tuberc Lung Dis 2018; 21:107-112. [PMID: 28157473 DOI: 10.5588/ijtld.16.0167] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
SETTING Multicentred hospital-based cases and control subjects in Korea. OBJECTIVE To evaluate the association between idiopathic pulmonary fibrosis (IPF) and hazardous materials to which people are occupationally exposed. DESIGN A multicentre, hospital-based, matched case-control study was performed. The ratio of IPF cases to controls was 1:1 (n = 78 in each group). IPF cases and controls were matched in terms of age group, sex and place of residence. Conditional logistic regression analysis was performed. RESULTS In simple logistic regression analysis, exposure to metal dust and any exposure for >1 year in an occupational setting were significantly associated with IPF (metal dust OR 4.00, 95%CI 1.34-11.97; any exposure OR 3.67, 95%CI 1.02-13.14). After adjustment for environmental and military exposures and smoking history, the OR for metal dust exposure was 4.97 (95%CI 1.36-18.17) in multiple logistic regression analysis. CONCLUSIONS Metal dust was associated with incident IPF in Seoul and Gyeonggi Provinces in Korea. This information will be used to support a tailored preventive strategy in specific industries or occupations.
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Affiliation(s)
- J-W Koo
- Department of Occupational and Environmental Medicine, Seoul St Mary's Hospital, Catholic University of Korea, Seoul, South Korea; Center for Occupational and Environmental Medicine, Seoul St Mary's Hospital, Catholic University of Korea, Seoul, South Korea
| | - J-P Myong
- Department of Occupational and Environmental Medicine, Seoul St Mary's Hospital, Catholic University of Korea, Seoul, South Korea<; Center for Occupational and Environmental Medicine, Seoul St Mary's Hospital, Catholic University of Korea, Seoul, South Korea
| | - H-K Yoon
- Department of Internal Medicine, Yeouido St Mary's Hospital, College of Medicine, Catholic University of Korea, Seoul, South Korea
| | - C K Rhee
- Department of Internal Medicine, Seoul St Mary's Hospital, College of Medicine, Catholic University of Korea, Seoul, South Korea
| | - Y Kim
- Department of Internal Medicine, Bucheon St Mary's Hospital, College of Medicine, Catholic University of Korea, Bucheon, South Korea
| | - J S Kim
- Department of Internal Medicine, Incheon St Mary's Hospital, College of Medicine, Catholic University of Korea, Incheon, South Korea
| | - B S Jo
- Department of Occupational and Environmental Medicine, Seoul St Mary's Hospital, Catholic University of Korea, Seoul, South Korea
| | - Y Cho
- Department of Occupational and Environmental Medicine, Seoul St Mary's Hospital, Catholic University of Korea, Seoul, South Korea
| | - J Byun
- Department of Occupational and Environmental Medicine, Seoul St Mary's Hospital, Catholic University of Korea, Seoul, South Korea
| | - M Choi
- Department of Occupational and Environmental Medicine, Seoul St Mary's Hospital, Catholic University of Korea, Seoul, South Korea
| | - H-R Kim
- Department of Occupational and Environmental Medicine, Seoul St Mary's Hospital, Catholic University of Korea, Seoul, South Korea; Center for Occupational and Environmental Medicine, Seoul St Mary's Hospital, Catholic University of Korea, Seoul, South Korea
| | - E-A Kim
- Occupational Safety and Health Research Institute, Korea Occupational Safety and Health Agency, Ulsan, Republic of Korea
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Lee S, Lee S, Yoon H, Lee CK, Yoo C, Park J, Byun J, Kim G, Lee B, Lee B, Hong Y. Printed cylindrical lens pair for application to the seam concealment in tiled displays. Opt Express 2018; 26:824-834. [PMID: 29401962 DOI: 10.1364/oe.26.000824] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/07/2017] [Accepted: 12/25/2017] [Indexed: 06/07/2023]
Abstract
Seamless tiling of displays is one of the key enabling technologies for the next-generation large-area electronics applications. In this paper, we propose a facile method to demonstrate a seamless display using cylindrical lens pair (CLP) fabricated by dispenser printing method. Optical properties of the printed CLP and corresponding capability of concealing seam in the display are analyzed by a set of luminance simulation and measurement in terms of geometric parameters of the lens. The seamless display with an optimized CLP features a viewing angle of the seam concealment of 40°.
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34
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Jin Seul A, Byun J, Ban Ju Y. Protective effect of Korean ginseng berry on hydrogen peroxide (H2O2)-induced oxidative damage in SH-SY5Y cells. Am J Transl Res 2017. [DOI: 10.1055/s-0037-1608447] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Affiliation(s)
- A Jin Seul
- Department of Dental Pharmacology, College of Dentistry, Dankook University, Cheonan, Korea, Republic of (South)
| | - J Byun
- Department of Dental Pharmacology, College of Dentistry, Dankook University, Cheonan, Korea, Republic of (South)
| | - Y Ban Ju
- Department of Dental Pharmacology, College of Dentistry, Dankook University, Cheonan, Korea, Republic of (South)
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35
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Cho H, Byun J. 512 The Decrease of psoriatic redness by PEMF in IL 17A-treated Keratinocytes. J Invest Dermatol 2017. [DOI: 10.1016/j.jid.2017.07.708] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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36
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Byun J, Singer E, Modi P, Farber N, Radadia K, Kim S, Rivera-Nunez Z, Goyal S, Jang T, Elsamra S, Parikh R. Utilization of Radiation Therapy in Locally Advanced Penile Cancer: A National Cancer Database Analysis. Int J Radiat Oncol Biol Phys 2017. [DOI: 10.1016/j.ijrobp.2017.06.1124] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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37
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Byun J, Jin Seul A, Ban Ju Y. Anti-inflammatory and anti-oxidant effects of Korean ginseng berry extract in LPS-activated RAW 264.7 macrophages. Am J Transl Res 2017. [DOI: 10.1055/s-0037-1608446] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Affiliation(s)
- J Byun
- Department of Dental Pharmacology, College of Dentistry, Dankook University, Cheonan, Korea, Republic of (South)
| | - A Jin Seul
- Department of Dental Pharmacology, College of Dentistry, Dankook University, Cheonan, Korea, Republic of (South)
| | - Y Ban Ju
- Department of Dental Pharmacology, College of Dentistry, Dankook University, Cheonan, Korea, Republic of (South)
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Affiliation(s)
- D. Jung
- Ewha Womans University, Seoul, Korea (the Republic of)
| | - J. Byun
- Ewha Womans University, Seoul, Korea (the Republic of)
| | - M. Lee
- Ewha Womans University, Seoul, Korea (the Republic of)
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39
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Koh Y, Byun J, Kim Y, Lee D, Park K, Yoon S, Bea G, Kim D. REDEFINING THE ROLE OF ETOPOSIDE IN PERIPHERAL T-CELL LYMPHOMA TREATMENT. Hematol Oncol 2017. [DOI: 10.1002/hon.2438_102] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Y. Koh
- Internal Medicine; Seoul National University Hospital; Seoul Republic of Korea
| | - J. Byun
- Internal Medicine; Seoul National University Hospital; Seoul Republic of Korea
| | - Y. Kim
- Cancer Policy Branch, National Cancer Control Institute; National Cancer Center; Goyang Republic of Korea
| | - D. Lee
- National Cancer Control Institute; National Cancer Center; Goyang Republic of Korea
| | - K. Park
- Cancer Policy Branch, National Cancer Control Institute; National Cancer Center; Goyang Republic of Korea
| | - S. Yoon
- Internal Medicine; Seoul National University Hospital; Seoul Republic of Korea
| | - G. Bea
- Cancer Policy Branch, National Cancer Control Institute; National Cancer Center; Goyang Republic of Korea
| | - D. Kim
- (none), Health Insurance Review Agency, Wonju; Gangwon-do Republic of Korea
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40
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Byun J, Kim H, Ahn H, Park H, Chung H. 111 Regulation of endothelial cell proliferation of infantile hemangioma through mTORC2 and FOXO1 signaling pathways. J Invest Dermatol 2017. [DOI: 10.1016/j.jid.2017.02.125] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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41
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Chung S, Shin Y, Byun J, Seong M, Cho H, SHIN W. 0345 EFFICACY OF UNPOLISHED RICE GERM-DRIVED GABA ON SUBJECTIVE AND OBJECTIVE QUALITY OF SLEEP IN PATIENTS WITH INSOMNIA: A RANDOMIZED, PLACEBO-CONTROLLED TRIAL. Sleep 2017. [DOI: 10.1093/sleepj/zsx050.344] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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42
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Byun J, Lee B, Oh E, Kim H, Kim S, Lee S, Hong Y. Fully printable, strain-engineered electronic wrap for customizable soft electronics. Sci Rep 2017; 7:45328. [PMID: 28338055 PMCID: PMC5364427 DOI: 10.1038/srep45328] [Citation(s) in RCA: 42] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2016] [Accepted: 02/22/2017] [Indexed: 11/16/2022] Open
Abstract
Rapid growth of stretchable electronics stimulates broad uses in multidisciplinary fields as well as industrial applications. However, existing technologies are unsuitable for implementing versatile applications involving adaptable system design and functions in a cost/time-effective way because of vacuum-conditioned, lithographically-predefined processes. Here, we present a methodology for a fully printable, strain-engineered electronic wrap as a universal strategy which makes it more feasible to implement various stretchable electronic systems with customizable layouts and functions. The key aspects involve inkjet-printed rigid island (PRI)-based stretchable platform technology and corresponding printing-based automated electronic functionalization methodology, the combination of which provides fully printed, customized layouts of stretchable electronic systems with simplified process. Specifically, well-controlled contact line pinning effect of printed polymer solution enables the formation of PRIs with tunable thickness; and surface strain analysis on those PRIs leads to the optimized stability and device-to-island fill factor of strain-engineered electronic wraps. Moreover, core techniques of image-based automated pinpointing, surface-mountable device based electronic functionalizing, and one-step interconnection networking of PRIs enable customized circuit design and adaptable functionalities. To exhibit the universality of our approach, multiple types of practical applications ranging from self-computable digital logics to display and sensor system are demonstrated on skin in a customized form.
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Affiliation(s)
- Junghwan Byun
- Department of Electrical and Computer Engineering, Inter-University Semiconductor Research Center (ISRC), Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 151-744, Korea
| | - Byeongmoon Lee
- Department of Electrical and Computer Engineering, Inter-University Semiconductor Research Center (ISRC), Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 151-744, Korea
| | - Eunho Oh
- Department of Electrical and Computer Engineering, Inter-University Semiconductor Research Center (ISRC), Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 151-744, Korea
| | - Hyunjong Kim
- Department of Electrical and Computer Engineering, Inter-University Semiconductor Research Center (ISRC), Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 151-744, Korea
| | - Sangwoo Kim
- Department of Electrical and Computer Engineering, Inter-University Semiconductor Research Center (ISRC), Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 151-744, Korea
| | - Seunghwan Lee
- Department of Electrical and Computer Engineering, Inter-University Semiconductor Research Center (ISRC), Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 151-744, Korea
| | - Yongtaek Hong
- Department of Electrical and Computer Engineering, Inter-University Semiconductor Research Center (ISRC), Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 151-744, Korea
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43
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Byun J, Goyal S, Kim I, Parikh R. Local Therapy Improves Overall Survival in Patients with Newly Diagnosed Metastatic Prostate Cancer. Int J Radiat Oncol Biol Phys 2016. [DOI: 10.1016/j.ijrobp.2016.06.459] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Affiliation(s)
- J. Byun
- College of Nursing; Ewha Womans University; Seoul Korea
| | - D. Jung
- College of Nursing; Ewha Womans University; Seoul Korea
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Abstract
Nanoporous polymeric networks, are firstly exploited for uranium capture from seawater. Amidoxime PIM-1 is capable of uptake 95% of uranium in 24 h, and the U extraction efficiency is to be intact throughout three cycles of sorbent regeneration.
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Affiliation(s)
- Y. H. Sihn
- Department of Nuclear and Quantum Engineering
- Korea Advanced Institute of Science and Technology (KAIST)
- Daejeon
- Korea
| | - J. Byun
- Graduate School of Energy, Environment, Water and Sustainability (EEWS)
- Korea Advanced Institute of Science and Technology (KAIST)
- Daejeon
- Korea
| | - H. A. Patel
- Graduate School of Energy, Environment, Water and Sustainability (EEWS)
- Korea Advanced Institute of Science and Technology (KAIST)
- Daejeon
- Korea
| | - W. Lee
- Department of Civil and Environmental Engineering
- Korea Advanced Institute of Science and Technology (KAIST)
- Daejeon
- Korea
| | - C. T. Yavuz
- Graduate School of Energy, Environment, Water and Sustainability (EEWS)
- Korea Advanced Institute of Science and Technology (KAIST)
- Daejeon
- Korea
- Department of Chemistry
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46
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Thirion D, Rozyyev V, Park J, Byun J, Jung Y, Atilhan M, Yavuz CT. Observation of the wrapping mechanism in amine carbon dioxide molecular interactions on heterogeneous sorbents. Phys Chem Chem Phys 2016; 18:14177-81. [DOI: 10.1039/c6cp01382a] [Citation(s) in RCA: 35] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
CO2 binds multiple amines if nearby, leading to higher heats of adsorption, a previously unknown observation.
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Affiliation(s)
- D. Thirion
- Graduate School of EEWS
- KAIST
- Daejeon
- Korea
| | - V. Rozyyev
- Department of Chemistry
- KAIST
- Daejeon
- Korea
| | - J. Park
- Graduate School of EEWS
- KAIST
- Daejeon
- Korea
| | - J. Byun
- Graduate School of EEWS
- KAIST
- Daejeon
- Korea
| | - Y. Jung
- Graduate School of EEWS
- KAIST
- Daejeon
- Korea
| | - M. Atilhan
- Department of Chemical Engineering
- Qatar University
- Doha
- Qatar
| | - C. T. Yavuz
- Graduate School of EEWS
- KAIST
- Daejeon
- Korea
- Department of Chemistry
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47
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Joo Y, Byun J, Seong N, Ha J, Kim H, Kim S, Kim T, Im H, Kim D, Hong Y. Silver nanowire-embedded PDMS with a multiscale structure for a highly sensitive and robust flexible pressure sensor. Nanoscale 2015; 7:6208-15. [PMID: 25779911 DOI: 10.1039/c5nr00313j] [Citation(s) in RCA: 115] [Impact Index Per Article: 12.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/19/2023]
Abstract
The development of highly sensitive pressure sensors with a low-cost and facile fabrication technique is desirable for electronic skins and wearable sensing devices. Here a low-cost and facile fabrication strategy to obtain multiscale-structured elastomeric electrodes and a highly sensitive and robust flexible pressure sensor is presented. The principles of spontaneous buckle formation of the PDMS surface and the embedding of silver nanowires are used to fabricate the multiscale-structured elastomeric electrode. By laminating the multiscale-structured elastomeric electrode onto the dielectric layer/bottom electrode template, the pressure sensor can be obtained. The pressure sensor is based on the capacitive sensing mechanism and shows high sensitivity (>3.8 kPa(-1)), fast response and relaxation time (<150 ms), high bending stability and high cycle stability. The fabrication process can be easily scaled up to produce pressure sensor arrays and they can detect the spatial distribution of the applied pressure. It is also demonstrated that the fingertip pressure sensing device can sense the pressure distribution of each finger, when grabbing an object.
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Affiliation(s)
- Yunsik Joo
- Department of Electrical and Computer Engineering, Inter University Semiconductor Research Center (ISRC), Seoul National University, Seoul, 151-742, Republic of Korea.
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Byun J, Son SM, Cha MY, Shong M, Hwang YJ, Kim Y, Ryu H, Moon M, Kim KS, Mook-Jung I. CR6-interacting factor 1 is a key regulator in Aβ-induced mitochondrial disruption and pathogenesis of Alzheimer's disease. Cell Death Differ 2014; 22:959-73. [PMID: 25361083 PMCID: PMC4423180 DOI: 10.1038/cdd.2014.184] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2014] [Revised: 08/25/2014] [Accepted: 09/25/2014] [Indexed: 12/13/2022] Open
Abstract
Mitochondrial dysfunction, often characterized by massive fission and other morphological abnormalities, is a well-known risk factor for Alzheimer's disease (AD). One causative mechanism underlying AD-associated mitochondrial dysfunction is thought to be amyloid-β (Aβ), yet the pathways between Aβ and mitochondrial dysfunction remain elusive. In this study, we report that CR6-interacting factor 1 (Crif1), a mitochondrial inner membrane protein, is a key player in Aβ-induced mitochondrial dysfunction. Specifically, we found that Crif1 levels were downregulated in the pathological regions of Tg6799 mice brains, wherein overexpressed Aβ undergoes self-aggregation. Downregulation of Crif1 was similarly observed in human AD brains as well as in SH-SY5Y cells treated with Aβ. In addition, knockdown of Crif1, using RNA interference, induced mitochondrial dysfunction with phenotypes similar to those observed in Aβ-treated cells. Conversely, Crif1 overexpression prevented Aβ-induced mitochondrial dysfunction and cell death. Finally, we show that Aβ-induced downregulation of Crif1 is mediated by enhanced reactive oxygen species (ROS) and ROS-dependent sumoylation of the transcription factor specificity protein 1 (Sp1). These results identify the ROS-Sp1-Crif1 pathway to be a new mechanism underlying Aβ-induced mitochondrial dysfunction and suggest that ROS-mediated downregulation of Crif1 is a crucial event in AD pathology. We propose that Crif1 may serve as a novel therapeutic target in the treatment of AD.
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Affiliation(s)
- J Byun
- Department of Biochemistry and Biomedical Sciences, Seoul National University College of Medicine, Seoul, Korea
| | - S M Son
- Department of Biochemistry and Biomedical Sciences, Seoul National University College of Medicine, Seoul, Korea
| | - M-Y Cha
- Department of Biochemistry and Biomedical Sciences, Seoul National University College of Medicine, Seoul, Korea
| | - M Shong
- Research Center for Endocrine and Metabolic Diseases, Chungnam National University School of Medicine, Daejeon, Korea
| | - Y J Hwang
- Center for Neuro-Medicine, Brain Science Institute, KIST, Seoul, Korea
| | - Y Kim
- Center for Neuro-Medicine, Brain Science Institute, KIST, Seoul, Korea
| | - H Ryu
- 1] Center for Neuro-Medicine, Brain Science Institute, KIST, Seoul, Korea [2] Department of Neurology and Pathology, Boston University School of Medicine, Boston, MA, USA
| | - M Moon
- Department of Psychiatry, McLean Hospital/Harvard Medical School, Belmont, MA, USA
| | - K-S Kim
- Department of Psychiatry, McLean Hospital/Harvard Medical School, Belmont, MA, USA
| | - I Mook-Jung
- Department of Biochemistry and Biomedical Sciences, Seoul National University College of Medicine, Seoul, Korea
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Lawrence C, Byun J, Chow V, Poon K, Havelock J, Roberts J, Seethram K. Improvement of sperm motility in surgically retrieved testicular sperm (TESE) samples with in vitro culture. Fertil Steril 2014. [DOI: 10.1016/j.fertnstert.2014.07.334] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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50
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Kim S, Byun J, Choi S, Kim D, Kim T, Chung S, Hong Y. Negatively strain-dependent electrical resistance of magnetically arranged nickel composites: application to highly stretchable electrodes and stretchable lighting devices. Adv Mater 2014; 26:3094-3099. [PMID: 24615882 DOI: 10.1002/adma.201304686] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/18/2013] [Revised: 11/10/2013] [Indexed: 06/03/2023]
Abstract
A novel property of the negatively strain-dependent electrical resistance change of nickel conductive composites is presented. The composite shows negatively strain-dependent resistance change when magnetically arranged, while most conductive materials show opposite behavior. This negative dependency is utilized to produce highly stretchable electrodes and to demonstrate a new conceptual resolution-sustainable stretchable lighting/display device.
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Affiliation(s)
- Sangwoo Kim
- Department of Electrical Engineering and Computer Science, Inter-University Semiconductor research Center (ISRC), Seoul National University, Seoul, 151-744, Republic of Korea
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