76
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Van 't Westeinde T, Charaghvandi K, Horton J, Yoo S, Scholten V, Van Asselen B, Van den Bongard H. EP-1546: MR-Linac based single fraction ablative radiotherapy for early-stage breast cancer: a planning study. Radiother Oncol 2017. [DOI: 10.1016/s0167-8140(17)31981-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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77
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Lee E, Park N, Oh Y, Yoo S, Lee H, Lee J, Kim Y. 728 3D Multi-photon imaging for evaluating the anti-aging efficacy of Paeonia Albiflora extract on UV-irradiated fibroblasts in a collagen matrix. J Invest Dermatol 2017. [DOI: 10.1016/j.jid.2017.02.752] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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78
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Seo HK, Kim H, Lee J, Park MH, Jeong SH, Kim YH, Kwon SJ, Han TH, Yoo S, Lee TW. Efficient Flexible Organic/Inorganic Hybrid Perovskite Light-Emitting Diodes Based on Graphene Anode. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2017; 29:1605587. [PMID: 28117521 DOI: 10.1002/adma.201605587] [Citation(s) in RCA: 75] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/17/2016] [Revised: 12/06/2016] [Indexed: 06/06/2023]
Abstract
Highly efficient organic/inorganic hybrid perovskite light-emitting diodes (PeLEDs) based on graphene anode are developed for the first time. Chemically inert graphene avoids quenching of excitons by diffused metal atom species from indium tin oxide. The flexible PeLEDs with graphene anode on plastic substrate show good bending stability; they provide an alternative and reliable flexible electrode for highly efficient flexible PeLEDs.
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79
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Kim BJ, Han D, Yoo S, Im SG. Organic/inorganic multilayer thin film encapsulation via initiated chemical vapor deposition and atomic layer deposition for its application to organic solar cells. KOREAN J CHEM ENG 2016. [DOI: 10.1007/s11814-016-0303-3] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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80
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Jain D, Sidharthan R, Moselund PM, Yoo S, Ho D, Bang O. Record power, ultra-broadband supercontinuum source based on highly GeO 2 doped silica fiber. OPTICS EXPRESS 2016; 24:26667-26677. [PMID: 27857397 DOI: 10.1364/oe.24.026667] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
We demonstrate highly germania doped fibers for mid-infrared supercontinuum generation. Experiments ensure a highest output power of 1.44 W for a broadest spectrum from 700 nm to 3200 nm and 6.4 W for 800 nm to 2700 nm from these fibers, while being pumped by a broadband Erbium-Ytterbium doped fiber based master oscillator power amplifier. The effect of repetition frequency of pump source and length of germania-doped fiber has also been investigated. Further, germania doped fiber has been pumped by conventional supercontinuum source based on silica photonic crystal fiber supercontinuum source. At low power, a considerable broadening of 200-300 nm was observed. Further broadening of spectrum was limited due to limited power of pump source. Our investigations reveal the unexploited potential of germania doped fiber for mid-infrared supercontinuum generation. These measurements ensure the potential of germania based photonic crystal fiber or a step-index fiber supercontinuum source for high power ultra-broad band emission being by pumped a 1060 nm or a 1550 nm laser source. To the best of our knowledge, this is the record power, ultra-broadband, and all-fiberized supercontinuum light source based on silica and germania fiber ever demonstrated to the date.
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81
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Sheng Y, Li T, Yoo S, Yin F, Blitzblau R, Horton J, Palta M, Hahn C, Ge Y, Wu Q. Development of an Ultra-Fast, High-Quality Whole-Breast Radiation Therapy Treatment Planning System. Int J Radiat Oncol Biol Phys 2016. [DOI: 10.1016/j.ijrobp.2016.06.566] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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82
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Lee J, Han TH, Park MH, Jung DY, Seo J, Seo HK, Cho H, Kim E, Chung J, Choi SY, Kim TS, Lee TW, Yoo S. Synergetic electrode architecture for efficient graphene-based flexible organic light-emitting diodes. Nat Commun 2016; 7:11791. [PMID: 27250743 PMCID: PMC4895731 DOI: 10.1038/ncomms11791] [Citation(s) in RCA: 70] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2016] [Accepted: 04/27/2016] [Indexed: 12/21/2022] Open
Abstract
Graphene-based organic light-emitting diodes (OLEDs) have recently emerged as a key element essential in next-generation displays and lighting, mainly due to their promise for highly flexible light sources. However, their efficiency has been, at best, similar to that of conventional, indium tin oxide-based counterparts. We here propose an ideal electrode structure based on a synergetic interplay of high-index TiO2 layers and low-index hole-injection layers sandwiching graphene electrodes, which results in an ideal situation where enhancement by cavity resonance is maximized yet loss to surface plasmon polariton is mitigated. The proposed approach leads to OLEDs exhibiting ultrahigh external quantum efficiency of 40.8 and 62.1% (64.7 and 103% with a half-ball lens) for single- and multi-junction devices, respectively. The OLEDs made on plastics with those electrodes are repeatedly bendable at a radius of 2.3 mm, partly due to the TiO2 layers withstanding flexural strain up to 4% via crack-deflection toughening. Replacing indium tin oxide with graphene in organic light-emitting diodes is a promising approach to enhance the flexibility of displays and light sources. Here, the authors combine graphene, TiO2 and low-index hole-injection layers to achieve high external quantum efficiency and good bendability.
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83
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Das L, Teh K, Tanya M, Yoo S, Tan J, Choo J, Tan T, Arkachaisri T. SAT0273 Corticosteroids as Rescue Therapy for Resistant Kawasaki Disease. Ann Rheum Dis 2016. [DOI: 10.1136/annrheumdis-2016-eular.5617] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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84
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Sheng Y, Li T, Yoo S, Yin F, Blitzblau R, Horton J, Palta M, Hahn C, Ge Y, Wu Q. WE-AB-209-05: Development of an Ultra-Fast High Quality Whole Breast Radiotherapy Treatment Planning System. Med Phys 2016. [DOI: 10.1118/1.4957774] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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85
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Furie R, Merrill J, Werth V, Khamashta M, Kalunian K, Brohawn P, Illei G, Drappa J, Wang L, Yoo S. OP0291 Anifrolumab, An Anti-Interferon-Alpha Receptor Monoclonal Antibody, in Moderate To Severe Systemic Lupus Erythematosus (SLE). Ann Rheum Dis 2016. [DOI: 10.1136/annrheumdis-2016-eular.3919] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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86
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Yoo S, Sprafke A, Lipiński W, Liu J. Feature issue introduction: light, energy and the environment, 2015. OPTICS EXPRESS 2016; 24:A981-A984. [PMID: 27409971 DOI: 10.1364/oe.24.00a981] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
The feature issue highlights contributions from authors who presented their research at the OSA Light, Energy and the Environment Congress, held in Suzhou, China from 2 to 5 November, 2015.
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87
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Kim JJ, Lee J, Yang SP, Kim HG, Kweon HS, Yoo S, Jeong KH. Biologically Inspired Organic Light-Emitting Diodes. NANO LETTERS 2016; 16:2994-3000. [PMID: 27014918 DOI: 10.1021/acs.nanolett.5b05183] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
Many animal species employ highly conspicuous traits as courtship signals for successful mating. Fireflies utilize their bioluminescent light as visual courtship signals. In addition to efficient bioluminescent light emission, the structural components of the firefly lantern also contribute to the enhancement of conspicuous optical signaling. Recently, these firefly lantern ultrastructures have attracted much interest and inspired highly efficient light management approaches. Here we report on the unique optical function of the hierarchical ultrastructures found in a firefly (Pyrocoelia rufa) and their biological inspiration of highly efficient organic light-emitting diode (OLED) applications. The hierarchical structures are comprised of longitudinal nanostructures and asymmetric microstructures, which were successfully replicated using geometry-guided resist reflow, replica molding, and polydimethylsiloxane (PDMS) oxidation. The external quantum efficiency (EQE) of the bioinspired OLEDs was enhanced by up to 61%. The bioinspired OLEDs clearly showed side-enhanced super-Lambertian emission with a wide-viewing angle. The highly efficient light extraction and wide-angle illumination suggest how the hierarchical structures likely improve the recognition of firefly optical courtship signals over a wide-angle range. At the same time, the biologically inspired designs provide a new paradigm for designing functional optical surfaces for lighting or display applications.
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88
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Oh YS, Lee H, Choi DY, Lee SU, Kim H, Yoo S, Park I, Sung HJ. High-Performance, Solution-Processed, Embedded Multiscale Metallic Transparent Conductors. ACS APPLIED MATERIALS & INTERFACES 2016; 8:10937-10945. [PMID: 27074908 DOI: 10.1021/acsami.6b02333] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
High-performance multiscale metallic transparent conductors (TCs) are demonstrated by incorporating Ag nanowire (NW) networks into microscale Ag grid structures. Highly conductive Ag grids are fabricated via direct imprinting of an Ag ion ink using a reservoir-assisted mold. In this mold, a macroscale cavity, called the "reservoir", is designed to connect to a grid-patterned cavity. The reservoir has a large cavity volume, which reduces unwanted residual layers within the grid spacings by introducing a thinner liquid film. The reservoir undergoes a large volume reduction during mold deformation, which improves ink filling within the grid-patterned cavity through deformation-induced ink injection. The multiscale metallic TCs show a sheet resistance (Rs) of <1.5 Ω/sq and a transmittance (T) of 86% at 550 nm, superior to the corresponding values of Ag NW networks (Rs of 15.6 Ω/sq at a similar T). We estimate the Rs-T performances of the Ag grids using geometrical calculations and demonstrate that their integration can enhance the opto-electrical properties of the Ag NW networks. Multiscale metallic TCs are successfully transferred and embedded into a transparent, flexible, and UV-curable polymer matrix. The embedded multiscale metallic TCs show reasonable electromechanical and chemical stability. The utility of these TCs is demonstrated by fabricating flexible organic solar cells.
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89
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Kang BK, Cho H, Han JH, Shin JW, Song J, Park SK, Lee J, Joo CW, Kim E, Yoo S, Lee JI, Ju BK, Moon J. Area-selective external light extraction for metal bus equipped large area transparent organic light-emitting diodes. OPTICS EXPRESS 2016; 24:5356-5365. [PMID: 29092359 DOI: 10.1364/oe.24.005356] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Area-selective external light extraction films based on wrinkle structured films were applied to large transparent organic light-emitting diodes (TOLEDs) with auxiliary metal buses. To be specific, on the external surface of the glass, we selectively formed a wrinkle structured film, which was aligned to the auxiliary metal electrodes. The wrinkle-structured film was patterned using a photo-mask and UV curing, which has the same shape of the auxiliary metal electrodes. With this area-selective film, it was possible to enhance the external quantum efficiencies of the bottom and top emissions TOLEDs by 15.7% and 15.1%, respectively, without significant loss in transmittance. Widened angular luminance distributions were also achieved in both emissions directions.
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90
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Lee K, Lee J, Kim E, Lee JI, Cho DH, Lim JT, Joo CW, Kim JY, Yoo S, Ju BK, Moon J. Simultaneously enhanced device efficiency, stabilized chromaticity of organic light emitting diodes with lambertian emission characteristic by random convex lenses. NANOTECHNOLOGY 2016; 27:075202. [PMID: 26778539 DOI: 10.1088/0957-4484/27/7/075202] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
An optical functional film applicable to various lighting devices is demonstrated in this study. The phase separation of two immiscible polymers in a common solvent was used to fabricate the film. In this paper, a self-organized lens-like structure is realized in this manner with optical OLED functional film. For an OLED, there are a few optical drawbacks, including light confinement or viewing angle distortion. By applying the optical film to an OLED, the angular spectra distortion resulting from the designed organic stack which produced the highest efficiency was successfully stabilized, simultaneously enhancing the efficiency of the OLED. We prove the effect of the film on the efficiency of OLEDs through an optical simulation. With the capability to overcome the main drawbacks of OLEDs, we contend that the proposed film can be applied to various lighting devices.
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91
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Kim Y, Park S, Lee YH, Jung J, Yoo S, Lee MH. Homoleptic Tris-Cyclometalated Iridium Complexes with Substituted o-Carboranes: Green Phosphorescent Emitters for Highly Efficient Solution-Processed Organic Light-Emitting Diodes. Inorg Chem 2016; 55:909-17. [DOI: 10.1021/acs.inorgchem.5b02444] [Citation(s) in RCA: 61] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
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92
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Sim DM, Kim M, Yim S, Choi MJ, Choi J, Yoo S, Jung YS. Controlled Doping of Vacancy-Containing Few-Layer MoS2 via Highly Stable Thiol-Based Molecular Chemisorption. ACS NANO 2015; 9:12115-23. [PMID: 26503105 DOI: 10.1021/acsnano.5b05173] [Citation(s) in RCA: 169] [Impact Index Per Article: 18.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
MoS2 is considered a promising two-dimensional active channel material for future nanoelectronics. However, the development of a facile, reliable, and controllable doping methodology is still critical for extending the applicability of MoS2. Here, we report surface charge transfer doping via thiol-based binding chemistry for modulating the electrical properties of vacancy-containing MoS2 (v-MoS2). Although vacancies present in 2D materials are generally regarded as undesirable components, we show that the electrical properties of MoS2 can be systematically engineered by exploiting the tight binding between the thiol group and sulfur vacancies and by choosing different functional groups. For example, we demonstrate that NH2-containing thiol molecules with lone electron pairs can serve as an n-dopant and achieve a substantial increase of electron density (Δn = 3.7 × 10(12) cm(-2)). On the other hand, fluorine-rich molecules can provide a p-doping effect (Δn = -7.0 × 10(11) cm(-2)) due to its high electronegativity. Moreover, the n- and p-doping effects were systematically evaluated by photoluminescence (PL), X-ray photoelectron spectroscopy (XPS), and electrical measurement results. The excellent binding stability of thiol molecules and recovery properties by thermal annealing will enable broader applicability of ultrathin MoS2 to various devices.
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93
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Cho H, Jeong SH, Park MH, Kim YH, Wolf C, Lee CL, Heo JH, Sadhanala A, Myoung N, Yoo S, Im SH, Friend RH, Lee TW. Overcoming the electroluminescence efficiency limitations of perovskite light-emitting diodes. Science 2015; 350:1222-5. [DOI: 10.1126/science.aad1818] [Citation(s) in RCA: 2021] [Impact Index Per Article: 224.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2015] [Accepted: 10/22/2015] [Indexed: 11/02/2022]
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94
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Yoo S, Horton J, Yin F, Blitzblau R. Dosimetric Effect of the Prone Breast Board and the Couch Top for Whole-Breast Treatment in Prone Position. Int J Radiat Oncol Biol Phys 2015. [DOI: 10.1016/j.ijrobp.2015.07.2105] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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95
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Chung J, Cho H, Koh TW, Lee J, Kim E, Lee J, Lee JI, Yoo S. Towards highly efficient and highly transparent OLEDs: advanced considerations for emission zone coupled with capping layer design. OPTICS EXPRESS 2015; 23:27306-27314. [PMID: 26480391 DOI: 10.1364/oe.23.027306] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Strategies to achieve efficient transparent organic light-emitting diodes (TrOLEDs) are presented. The emission zone position is carefully adjusted by monitoring the optical phase change upon reflection from the top electrode, which is significant when the thickness of the capping layer changes. With the proposed design strategy, external quantum efficiency and transmittance values as high as 15% and 80% are demonstrated simultaneously. The effect of surface plasmon polariton (SPP) loss from thin metal electrodes is also taken into account to correctly describe the full scaling behavior of the efficiency of TrOLEDs over key optical design parameters.
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Chungsomprasong P, Hamilton R, Fatah M, Seed M, Manlhiot C, Yoo S, McCrindle B, Grosse-Wortmann L. PRESENTATION AND DISEASE PROGRESSION OF CHILDREN AND ADOLESCENTS EVALUATED FOR ARRHYTHMOGENIC RIGHT VENTRICULAR CARDIOMYOPATHY. Can J Cardiol 2015. [DOI: 10.1016/j.cjca.2015.07.399] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
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97
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Tremblay C, Yoo S, Mertens L, Jacques F, Greenway S, Caldarone C, Coles J, Grosse-Wortmann L. COMPARISON OF THE SUTURELESS REPAIR TO THE CLASSICAL APPROACH FOR PULMONARY VEIN PATHOLOGIES: A PROSPECTIVE PILOT STUDY USING CARDIAC MAGNETIC RESONANCE. Can J Cardiol 2015. [DOI: 10.1016/j.cjca.2015.07.452] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
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98
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Lacouture M, Guillen J, Kudchadkar R, Rogers G, Olencki T, Tang J, Yoo S, Dawson K, Mun Y, Sekulic A. 3332 Real-world treatment of vismodegib (VISMO)-related adverse events (AEs) in patients with locally advanced basal cell carcinoma: Report from the RegiSONIC Disease Registry Study. Eur J Cancer 2015. [DOI: 10.1016/s0959-8049(16)31850-0] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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99
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Yoo S, Ghafoor K, Kim S, Sun Y, Kim J, Yang K, Lee DU, Shahbaz H, Park J. Inactivation of pathogenic bacteria inoculated onto a Bacto™agar model surface using TiO2-UVC photocatalysis, UVC and chlorine treatments. J Appl Microbiol 2015; 119:688-96. [DOI: 10.1111/jam.12877] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2014] [Revised: 05/28/2015] [Accepted: 06/14/2015] [Indexed: 12/30/2022]
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100
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White TP, Wysocki G, Domínguez C, Yoo S. Feature issue introduction: Light, Energy and the Environment, 2014. OPTICS EXPRESS 2015; 23:A764-A766. [PMID: 26072898 DOI: 10.1364/oe.23.00a764] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
This feature issue highlights contributions from authors who presented their research at the OSA Light, Energy and the Environment Congress, held in Canberra, Australia from 2-5 December, 2014.
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