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Kim Y, Jung GI, Jeon D, Wijesinghe RE, Seong D, Lee J, Do WJ, Kwon SM, Lee JH, Hwang JH, Kim HD, Lee KB, Jeon M, Kim J. Non-Invasive Optical Coherence Tomography Data-Based Quantitative Algorithm for the Assessment of Residual Adhesive on Bracket-Removed Dental Surface. Sensors (Basel) 2021; 21:4670. [PMID: 34300410 PMCID: PMC8309505 DOI: 10.3390/s21144670] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [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] [Subscribe] [Scholar Register] [Received: 05/21/2021] [Revised: 06/30/2021] [Accepted: 07/05/2021] [Indexed: 11/17/2022]
Abstract
The aim of this study was to quantitatively assess the residual adhesive on orthodontic ceramic bracket-removed dental surface. In orthodontic process, ceramic bracket was repeated debonding physically, then the adhesive remained on the dental surface. The residual adhesive caused a lack of adhesive strength between dental and ceramic bracket. Since commonly used adhesive in orthodontics is translucent, residual adhesive is hard to be detected with conventional microscopes. Therefore, 1310 nm center wavelength swept-source OCT system based on laboratory customized image processing algorithm was used for the precise detection of residual adhesive on tooth surface. The algorithm separates residual adhesive from dental surface by comparing the height of adjacent B-scan images, while providing color-scaled images emphasizing the thickness information of residual adhesive. Finally, the acquired results were compared with microscopic and adhesive remnant index scoring gold standards, while the comparison confirmed the potential merits and the improvements of the proposed method over gold standards.
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Affiliation(s)
- Yoonseok Kim
- School of Electronic and Electrical Engineering, College of IT Engineering, Kyungpook National University, Daegu 41566, Korea; (Y.K.); (D.J.); (D.S.); (J.L.); (H.D.K.); (J.K.)
| | - Gu-In Jung
- Institute of Advanced Convergence Technology, Kyungpook National University, Daegu 41061, Korea; (G.-I.J.); (W.J.D.); (S.-M.K.); (J.H.L.); (J.H.H.)
| | - Deokmin Jeon
- School of Electronic and Electrical Engineering, College of IT Engineering, Kyungpook National University, Daegu 41566, Korea; (Y.K.); (D.J.); (D.S.); (J.L.); (H.D.K.); (J.K.)
| | - Ruchire Eranga Wijesinghe
- Department of Materials and Mechanical Technology, Faculty of Technology, University of Sri Jayewardenepura, Pitipana, Homagama 10200, Sri Lanka;
| | - Daewoon Seong
- School of Electronic and Electrical Engineering, College of IT Engineering, Kyungpook National University, Daegu 41566, Korea; (Y.K.); (D.J.); (D.S.); (J.L.); (H.D.K.); (J.K.)
| | - Jaeyul Lee
- School of Electronic and Electrical Engineering, College of IT Engineering, Kyungpook National University, Daegu 41566, Korea; (Y.K.); (D.J.); (D.S.); (J.L.); (H.D.K.); (J.K.)
| | - Woo Jong Do
- Institute of Advanced Convergence Technology, Kyungpook National University, Daegu 41061, Korea; (G.-I.J.); (W.J.D.); (S.-M.K.); (J.H.L.); (J.H.H.)
| | - Sung-Min Kwon
- Institute of Advanced Convergence Technology, Kyungpook National University, Daegu 41061, Korea; (G.-I.J.); (W.J.D.); (S.-M.K.); (J.H.L.); (J.H.H.)
| | - Jong Hoon Lee
- Institute of Advanced Convergence Technology, Kyungpook National University, Daegu 41061, Korea; (G.-I.J.); (W.J.D.); (S.-M.K.); (J.H.L.); (J.H.H.)
| | - Jun Ho Hwang
- Institute of Advanced Convergence Technology, Kyungpook National University, Daegu 41061, Korea; (G.-I.J.); (W.J.D.); (S.-M.K.); (J.H.L.); (J.H.H.)
| | - Hyun Deok Kim
- School of Electronic and Electrical Engineering, College of IT Engineering, Kyungpook National University, Daegu 41566, Korea; (Y.K.); (D.J.); (D.S.); (J.L.); (H.D.K.); (J.K.)
- Institute of Advanced Convergence Technology, Kyungpook National University, Daegu 41061, Korea; (G.-I.J.); (W.J.D.); (S.-M.K.); (J.H.L.); (J.H.H.)
| | - Kyu-Bok Lee
- Advanced Dental Device Development Institute, Kyungpook National University, Daegu 41940, Korea;
- Department of Prosthodontics, School of Dentistry, Kyungpook National University, Daegu 41940, Korea
| | - Mansik Jeon
- School of Electronic and Electrical Engineering, College of IT Engineering, Kyungpook National University, Daegu 41566, Korea; (Y.K.); (D.J.); (D.S.); (J.L.); (H.D.K.); (J.K.)
| | - Jeehyun Kim
- School of Electronic and Electrical Engineering, College of IT Engineering, Kyungpook National University, Daegu 41566, Korea; (Y.K.); (D.J.); (D.S.); (J.L.); (H.D.K.); (J.K.)
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Jung GI, Park BK, Kim JS, Lee TH, Choi JH, Oh HB, Kim AH, Goh BJ, Kim JW, Lee KS, Jun JH. A new optical technique to monitor joint motion using position sensitive detector. Technol Health Care 2015; 23 Suppl 2:S473-80. [PMID: 26410514 DOI: 10.3233/thc-150984] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
BACKGROUND Evaluation of joint movements is essential to choose an appropriate rehabilitation protocol for a patient. OBJECTIVE The aim of this study is to suggest an alternative optical technique for measurement of joint angle which is convenient, inexpensive, and can be operated in real time. METHODS According to the principle of the triangulation method, position sensitive detector (PSD) converts reflected light signals into distance-related voltages. Various parameters were investigated to increase detection range and resolution of joint angle measurements. RESULTS The accuracy of the suggested optical sensor was verified by comparing with a commercial goniometer and 3D motion capture system. CONCLUSIONS This method can be applied to monitor recovery progress for the patient in rehabilitation and sport science.
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Affiliation(s)
- Gu-In Jung
- Department of Biomedical Engineering, BK21+ Research Institute of Biomedical Engineering, College of Biomedical and Health Science, Konkuk University, Chungju, Korea
| | | | - Ji-Sun Kim
- Department of Biomedical Engineering, BK21+ Research Institute of Biomedical Engineering, College of Biomedical and Health Science, Konkuk University, Chungju, Korea
| | - Tae-Hee Lee
- Department of Biomedical Engineering, BK21+ Research Institute of Biomedical Engineering, College of Biomedical and Health Science, Konkuk University, Chungju, Korea
| | - Ju-Hyeon Choi
- Department of Biomedical Engineering, BK21+ Research Institute of Biomedical Engineering, College of Biomedical and Health Science, Konkuk University, Chungju, Korea
| | - Han-Byeol Oh
- Department of Biomedical Engineering, BK21+ Research Institute of Biomedical Engineering, College of Biomedical and Health Science, Konkuk University, Chungju, Korea
| | - A-Hee Kim
- Department of Biomedical Engineering, BK21+ Research Institute of Biomedical Engineering, College of Biomedical and Health Science, Konkuk University, Chungju, Korea
| | - Bong-Jun Goh
- Department of Biomedical Engineering, BK21+ Research Institute of Biomedical Engineering, College of Biomedical and Health Science, Konkuk University, Chungju, Korea
| | - Ji-Won Kim
- Department of Biomedical Engineering, BK21+ Research Institute of Biomedical Engineering, College of Biomedical and Health Science, Konkuk University, Chungju, Korea
| | | | - Jae-Hoon Jun
- Department of Biomedical Engineering, BK21+ Research Institute of Biomedical Engineering, College of Biomedical and Health Science, Konkuk University, Chungju, Korea
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Kim JS, Jung GI, Choi JH, Lee TH, Kim AH, Oh HB, Kwon Y, Lee ES, Cho YB, Jun JH. Development of multi-colored LED system for therapeutic application. Technol Health Care 2015; 23 Suppl 2:S511-7. [PMID: 26410518 DOI: 10.3233/thc-150988] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
BACKGROUND The evaluation and control of lighting is crucial in physiological, biomedical, and industrial fields. Many kinds of lighting techniques based on LED have been developed due to its advantages. OBJECTIVE The aim of this study is to develop the multi-colored LED system for healing purposes. METHODS Light source with three-color chip LEDs was investigated to detect the dominant wavelength. RESULTS The results show that the additive principle by three-color LEDs can be successfully applied to lighting system by generating a variety of colors. CONCLUSIONS The results are expected to be useful in the field of light therapy and medicine. Applications of the developed light system are lighting therapies such as stimulating blood circulation and digestive processes, and controlling inflammation.
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Affiliation(s)
- Ji-Sun Kim
- Department of Biomedical Engineering, Research Institute of Biomedical Engineering, College of Biomedical and Health Science, Konkuk University, Chungju, Korea
| | - Gu-In Jung
- Department of Biomedical Engineering, Research Institute of Biomedical Engineering, College of Biomedical and Health Science, Konkuk University, Chungju, Korea
| | - Ju-Hyeon Choi
- Department of Biomedical Engineering, Research Institute of Biomedical Engineering, College of Biomedical and Health Science, Konkuk University, Chungju, Korea
| | - Tae-Hee Lee
- Department of Biomedical Engineering, Research Institute of Biomedical Engineering, College of Biomedical and Health Science, Konkuk University, Chungju, Korea
| | - A-Hee Kim
- Department of Biomedical Engineering, Research Institute of Biomedical Engineering, College of Biomedical and Health Science, Konkuk University, Chungju, Korea
| | - Han-Byeol Oh
- Department of Biomedical Engineering, Research Institute of Biomedical Engineering, College of Biomedical and Health Science, Konkuk University, Chungju, Korea
| | - Yuri Kwon
- Department of Biomedical Engineering, Research Institute of Biomedical Engineering, College of Biomedical and Health Science, Konkuk University, Chungju, Korea
| | - Eun-Suk Lee
- Department of Biomedical Engineering, Research Institute of Biomedical Engineering, College of Biomedical and Health Science, Konkuk University, Chungju, Korea
| | - Yeong Bin Cho
- School of Business Administration and Economics, Konkuk University, Chungju, Korea
| | - Jae-Hoon Jun
- Department of Biomedical Engineering, Research Institute of Biomedical Engineering, College of Biomedical and Health Science, Konkuk University, Chungju, Korea
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Kim JS, Kim AH, Oh HB, Goh BJ, Lee ES, Kim JS, Jung GI, Baek JY, Jun JH. Simple LED spectrophotometer for analysis of color information. Biomed Mater Eng 2015; 26 Suppl 1:S1773-80. [DOI: 10.3233/bme-151478] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Affiliation(s)
- Ji-Sun Kim
- Department of Biomedical Engineering, BK21 Plus Research Institute of Biomedical Engineering, College of Biomedical and Health Science, Konkuk University, Chungju, Republic of Korea
| | - A-Hee Kim
- Department of Biomedical Engineering, BK21 Plus Research Institute of Biomedical Engineering, College of Biomedical and Health Science, Konkuk University, Chungju, Republic of Korea
| | - Han-Byeol Oh
- Department of Biomedical Engineering, BK21 Plus Research Institute of Biomedical Engineering, College of Biomedical and Health Science, Konkuk University, Chungju, Republic of Korea
| | - Bong-Jun Goh
- Department of Biomedical Engineering, BK21 Plus Research Institute of Biomedical Engineering, College of Biomedical and Health Science, Konkuk University, Chungju, Republic of Korea
| | - Eun-Suk Lee
- Department of Biomedical Engineering, BK21 Plus Research Institute of Biomedical Engineering, College of Biomedical and Health Science, Konkuk University, Chungju, Republic of Korea
| | - Jun-Sik Kim
- Department of Biomedical Engineering, BK21 Plus Research Institute of Biomedical Engineering, College of Biomedical and Health Science, Konkuk University, Chungju, Republic of Korea
| | - Gu-In Jung
- Department of Biomedical Engineering, BK21 Plus Research Institute of Biomedical Engineering, College of Biomedical and Health Science, Konkuk University, Chungju, Republic of Korea
| | - Jin-Young Baek
- Department of Biomedical Engineering, BK21 Plus Research Institute of Biomedical Engineering, College of Biomedical and Health Science, Konkuk University, Chungju, Republic of Korea
| | - Jae-Hoon Jun
- Department of Biomedical Engineering, BK21 Plus Research Institute of Biomedical Engineering, College of Biomedical and Health Science, Konkuk University, Chungju, Republic of Korea
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Kim HS, Kim JS, Jung GI, Jun JH, Park JR, Kim SP, Choi S, Park SJ, Choi MH, Chung SC. Evaluation of the possibility and response characteristics of laser-induced tactile sensation. Neurosci Lett 2015; 602:68-72. [PMID: 26145316 DOI: 10.1016/j.neulet.2015.06.053] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [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: 04/18/2015] [Revised: 06/13/2015] [Accepted: 06/29/2015] [Indexed: 10/23/2022]
Abstract
In this study, we examined the possibility and perceptual response characteristics of tactile sense induced by laser stimulation to the finger with different laser energy densities through human response experiments. 15 healthy adult males and 4 healthy adult females with an age of 22.6±2.2 years were tested. A frequency-doubled Q-switched laser was used with a wavelength of 532 nm and a 5 ns pulse width. The experimental trial spanned a total of 30 s and included a rest phase (19 s), a stimulation phase (7 s), and a response phase (4 s). During the rest phase, subjects kept their fingers comfortable. During the stimulation phase, one of three types of laser energy density (13.5, 16.6, 19.8 mJ/cm(2)) or a sham stimulation was used to irradiate the distal phalanx on the right index finger. During the response phase, the cognitive response to the laser stimulation was recorded by a PC by pressing the response button. The confusion matrix was configured to evaluate the possibility that the tactile sense was caused by the laser. In addition, changes in the response characteristics were observed according to three types of laser energy densities. From the analysis of the confusion matrix, the accuracy and sensitivity were not high. In contrast, precision and specificity were found to be high. Furthermore, there was a strong positive correlation between the laser irradiation and tactile perception, indicating that tactile sense can be induced using a laser in a mid-air manner. In addition, it was found that as the laser energy density increased, the tactile perception possibility also increased.
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Affiliation(s)
- Hyung-Sik Kim
- Department of Biomedical Engineering, BK21+ Research Institute of Biomedical Engineering, College of Biomedical & Health Science, Konkuk University, Chungju, Chungbuk 380-701, South Korea
| | - Ji-Sun Kim
- Department of Biomedical Engineering, BK21+ Research Institute of Biomedical Engineering, College of Biomedical & Health Science, Konkuk University, Chungju, Chungbuk 380-701, South Korea
| | - Gu-In Jung
- Department of Biomedical Engineering, BK21+ Research Institute of Biomedical Engineering, College of Biomedical & Health Science, Konkuk University, Chungju, Chungbuk 380-701, South Korea
| | - Jae-Hoon Jun
- Department of Biomedical Engineering, BK21+ Research Institute of Biomedical Engineering, College of Biomedical & Health Science, Konkuk University, Chungju, Chungbuk 380-701, South Korea
| | - Jong-Rak Park
- Department of Photonic Engineering, Chosun University, Gwangju 501-759, South Korea
| | - Sung-Phil Kim
- Department of Human and Systems Engineering, Ulsan National Institute of Science and Technology, Ulsan 689-798, South Korea
| | - Seungmoon Choi
- Department of Computer Science and Engineering, Pohang University of Science and Technology, Pohang, Gyeongbuk 790-784, South Korea
| | - Sung-Jun Park
- Department of Biomedical Engineering, BK21+ Research Institute of Biomedical Engineering, College of Biomedical & Health Science, Konkuk University, Chungju, Chungbuk 380-701, South Korea
| | - Mi-Hyun Choi
- Department of Biomedical Engineering, BK21+ Research Institute of Biomedical Engineering, College of Biomedical & Health Science, Konkuk University, Chungju, Chungbuk 380-701, South Korea
| | - Soon-Cheol Chung
- Department of Biomedical Engineering, BK21+ Research Institute of Biomedical Engineering, College of Biomedical & Health Science, Konkuk University, Chungju, Chungbuk 380-701, South Korea.
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Jung GI, Kim JS, Lee TH, Choi JH, Oh HB, Kim AH, Kim JS, Park JR, Chung SC, Yeom DI, Kim HS, Jun JH. Photomechanical effect on Type I collagen using pulsed diode laser. Technol Health Care 2015; 23 Suppl 2:S535-41. [DOI: 10.3233/thc-150991] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Affiliation(s)
- Gu-In Jung
- Department of Biomedical Engineering, BK21+ Research Institute of Biomedical Engineering, College of Biomedical and Health Science, Konkuk University, Chungju, Korea
| | - Ji-Sun Kim
- Department of Biomedical Engineering, BK21+ Research Institute of Biomedical Engineering, College of Biomedical and Health Science, Konkuk University, Chungju, Korea
| | - Tae-Hee Lee
- Department of Biomedical Engineering, BK21+ Research Institute of Biomedical Engineering, College of Biomedical and Health Science, Konkuk University, Chungju, Korea
| | - Ju-Hyeon Choi
- Department of Biomedical Engineering, BK21+ Research Institute of Biomedical Engineering, College of Biomedical and Health Science, Konkuk University, Chungju, Korea
| | - Han-Byeol Oh
- Department of Biomedical Engineering, BK21+ Research Institute of Biomedical Engineering, College of Biomedical and Health Science, Konkuk University, Chungju, Korea
| | - A-Hee Kim
- Department of Biomedical Engineering, BK21+ Research Institute of Biomedical Engineering, College of Biomedical and Health Science, Konkuk University, Chungju, Korea
| | - Jun-Sik Kim
- Department of Biomedical Engineering, BK21+ Research Institute of Biomedical Engineering, College of Biomedical and Health Science, Konkuk University, Chungju, Korea
| | - Jong-Rak Park
- Department of Photonic Engineering, Chosun University, Gwangju, Korea
| | - Soon-Cheol Chung
- Department of Biomedical Engineering, BK21+ Research Institute of Biomedical Engineering, College of Biomedical and Health Science, Konkuk University, Chungju, Korea
| | - Dong-Il Yeom
- Department of Physics, Ajou University, Suwon, Korea
- Department of Energy Systems Research, Ajou University, Suwon, Korea
| | - Hyung-Sik Kim
- Department of Biomedical Engineering, BK21+ Research Institute of Biomedical Engineering, College of Biomedical and Health Science, Konkuk University, Chungju, Korea
| | - Jae-Hoon Jun
- Department of Biomedical Engineering, BK21+ Research Institute of Biomedical Engineering, College of Biomedical and Health Science, Konkuk University, Chungju, Korea
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Jun JH, Park JR, Kim SP, Min Bae Y, Park JY, Kim HS, Choi S, Jung SJ, Hwa Park S, Yeom DI, Jung GI, Kim JS, Chung SC. Laser-induced thermoelastic effects can evoke tactile sensations. Sci Rep 2015; 5:11016. [PMID: 26047142 PMCID: PMC4603782 DOI: 10.1038/srep11016] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.0] [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: 06/27/2014] [Accepted: 05/06/2015] [Indexed: 11/09/2022] Open
Abstract
Humans process a plethora of sensory information that is provided by various entities in the surrounding environment. Among the five major senses, technology for touch, haptics, is relatively young and has relatively limited applications largely due to its need for physical contact. In this article, we suggest a new way for non-contact haptic stimulation that uses laser, which has potential advantages such as mid-air stimulation, high spatial precision, and long working distance. We demonstrate such tactile stimulation can be enabled by laser-induced thermoelastic effects by means of physical and perceptual studies, as well as simulations. In the physical study, the mechanical effect of laser on a human skin sample is detected using low-power radiation in accordance with safety guidelines. Limited increases (< ~2.5 °C) in temperature at the surface of the skin, examined by both thermal camera and the Monte Carlo simulation, indicate that laser does not evoke heat-induced nociceptive sensation. In the human EEG study, brain responses to both mechanical and laser stimulation are consistent, along with subjective reports of the non-nociceptive sensation of laser stimuli.
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Affiliation(s)
- Jae-Hoon Jun
- Department of Biomedical Engineering, BK21+ Research Institute of Biomedical Engineering, College of Biomedical &Health Science, Konkuk University, Chungju, Chungbuk 380-701, South Korea
| | - Jong-Rak Park
- Department of Photonic Engineering, Chosun University, Gwangju 501-759, South Korea
| | - Sung-Phil Kim
- Department of Human and Systems Engineering, Ulsan National Institute of Science and Technology, Ulsan 689-798, South Korea
| | - Young Min Bae
- Department of Physiology, KU Open Innovation Center, Research Institute of Medical Science, Konkuk University School of Medicine, Chungju, Chungbuk 380-701, South Korea
| | - Jang-Yeon Park
- 1] Center for Neuroscience Imaging Research (CNIR), Institute for Basic Science (IBS), Suwon, Gyeonggi 440-746, South Korea [2] Department of Biomedical Engineering, Sungkyunkwan University, Suwon, Gyeonggi 440-746, South Korea
| | - Hyung-Sik Kim
- Department of Biomedical Engineering, BK21+ Research Institute of Biomedical Engineering, College of Biomedical &Health Science, Konkuk University, Chungju, Chungbuk 380-701, South Korea
| | - Seungmoon Choi
- Department of Computer Science and Engineering, Pohang University of Science and Technology, Pohang, Gyeongbuk 790-784, South Korea
| | - Sung Jun Jung
- Department of Physiology, Medical School, Hanyang University, Seoul 133-791, South Korea
| | - Seung Hwa Park
- Department of Anatomy, Konkuk University School of Medicine, Chungju, Chungbuk 380-701, South Korea
| | - Dong-Il Yeom
- Department of Physics and Energy Systems Research, Ajou University, Suwon, Gyeonggi 443-749, South Korea
| | - Gu-In Jung
- Department of Biomedical Engineering, BK21+ Research Institute of Biomedical Engineering, College of Biomedical &Health Science, Konkuk University, Chungju, Chungbuk 380-701, South Korea
| | - Ji-Sun Kim
- Department of Biomedical Engineering, BK21+ Research Institute of Biomedical Engineering, College of Biomedical &Health Science, Konkuk University, Chungju, Chungbuk 380-701, South Korea
| | - Soon-Cheol Chung
- Department of Biomedical Engineering, BK21+ Research Institute of Biomedical Engineering, College of Biomedical &Health Science, Konkuk University, Chungju, Chungbuk 380-701, South Korea
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Kwon Y, Park SH, Kim JW, Ho Y, Jeon HM, Bang MJ, Jung GI, Lee SM, Eom GM, Koh SB, Lee JW, Jeon HS. A practical method for the detection of freezing of gait in patients with Parkinson's disease. Clin Interv Aging 2014; 9:1709-19. [PMID: 25336936 PMCID: PMC4199977 DOI: 10.2147/cia.s69773] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
Abstract
Purpose Freezing of gait (FOG), increasing the fall risk and limiting the quality of life, is common at the advanced stage of Parkinson’s disease, typically in old ages. A simple and unobtrusive FOG detection system with a small calculation load would make a fast presentation of on-demand cueing possible. The purpose of this study was to find a practical FOG detection system. Patients and methods A sole-mounted sensor system was developed for an unobtrusive measurement of acceleration during gait. Twenty patients with Parkinson’s disease participated in this study. A simple and fast time-domain method for the FOG detection was suggested and compared with the conventional frequency-domain method. The parameters used in the FOG detection were optimized for each patient. Results The calculation load was 1,154 times less in the time-domain method than the conventional method, and the FOG detection performance was comparable between the two domains (P=0.79) and depended on the window length (P<0.01) and dimension of sensor information (P=0.03). Conclusion A minimally constraining sole-mounted sensor system was developed, and the suggested time-domain method showed comparable FOG detection performance to that of the conventional frequency-domain method. Three-dimensional sensor information and 3–4-second window length were desirable. The suggested system is expected to have more practical clinical applications.
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Affiliation(s)
- Yuri Kwon
- Biomedical Engineering, Konkuk University, Chungju, Korea
| | - Sang Hoon Park
- Biomedical Engineering, Konkuk University, Chungju, Korea
| | - Ji-Won Kim
- Biomedical Engineering, Konkuk University, Chungju, Korea
| | - Yeji Ho
- Biomedical Engineering, Konkuk University, Chungju, Korea
| | | | - Min-Jung Bang
- Biomedical Engineering, Konkuk University, Chungju, Korea
| | - Gu-In Jung
- Biomedical Engineering, Konkuk University, Chungju, Korea
| | - Seon-Min Lee
- Department of Neurology, Korea University College of Medicine, Seoul, Korea
| | - Gwang-Moon Eom
- Biomedical Engineering, Konkuk University, Chungju, Korea ; Research Institute of Biomedical Engineering, Konkuk University, Chungju, Korea
| | - Seong-Beom Koh
- Department of Neurology, Korea University College of Medicine, Seoul, Korea
| | - Jeong-Whan Lee
- Biomedical Engineering, Konkuk University, Chungju, Korea ; Research Institute of Biomedical Engineering, Konkuk University, Chungju, Korea
| | - Heung Seok Jeon
- Department of Computer Engineering, Konkuk University, Chungju, Korea
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Jung GI, Kim JS, Lee TH, Choi JH, Oh HB, Kim AH, Eom GM, Lee JH, Chung SC, Park JR, Lee YJ, Park HJ, Jun JH. Development of an optical fiber sensor for angular displacement measurements. Biomed Mater Eng 2013; 24:771-80. [PMID: 24211963 DOI: 10.3233/bme-130867] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
For diagnostic and therapeutic purposes, the joint angle measurement of a patient after an accident or a surgical operation is significant for monitoring and evaluating the recovering process. This paper proposed an optical fiber sensor for the measurement of angular displacement. The effect of beveled fiber angle on the detected light signal was investigated to find an appropriate mathematical model. Beveled fiber tips redirected the light over a range of angles away from the fiber axis. Inverse polynomial models were applied to directly obtain and display the joint angle change in real time with the Lab-VIEW program. The actual joint angle correlated well with the calculated LabVIEW output angle over the test range. The proposed optical sensor is simple, cost effective, small in size, and can evaluate the joint angle in real time. This method is expected to be useful in the field of rehabilitation and sport science.
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Affiliation(s)
- Gu-In Jung
- Department of Biomedical Engineering, College of Biomedical and Health Science, Konkuk University, Chungju, South Korea Department of Biomedical Engineering, Research Institute of Biomedical Engineering, Konkuk University, Chungju, South Korea
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