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레이저 흡수에 의해 발생하는 열 효과의 펄스 폭 의존성
장경민 ( Kyungmin Jang ),양승진 ( Seung Jin Yang ),백준혁 ( Jun Hyeok Baek ),김재영 ( Jae Young Kim ),정재훈 ( Jae Hoon Jung ),권민기 ( Min Ki Kwon ),박종락 ( Jong Rak Park ) 조선대학교 공학기술연구원 2016 공학기술논문지 Vol.9 No.1
We investigated the thermal effects induced by pulsed laser absorption in an optical medium. In particular, the dependences of maximum temperature increment and decay time constant on the laser pulse width were examined. As the laser pulse width was increased, the maximum temperature increment was decreased and the decay time constant was increased. It was found that the temporal behaviors of the temperature increment could be predicted by the convolution of the response function of the system with a very short laser pulse and a square pulse function corresponding to the laser pulse width.
레이저 흡수에 의해 발생하는 열 효과의 빔 직경 및 흡수 계수 의존성
장경민 ( Kyungmin Jang ),백준혁 ( Jun-hyeok Baek ),양승진 ( Seung-jin Yang ),정재훈 ( Jae Hoon Jung ),권민기 ( Min-ki Kwon ),박종락 ( Jong-rak Park ) 조선대학교 공학기술연구원 2016 공학기술논문지 Vol.9 No.2
The thermal effects induced by pulsed laser absorption in an optical medium were simulated. In particular, the dependences of maximum temperature increase and decay time constant on the laser beam diameter and the medium absorption coefficient were investigated. The maximum temperature increase showed the inverse square dependence on the laser beam diameter, and the decay time constant was found to be almost independent of the laser beam diameter for relatively large absorption coefficients. As the absorption coefficient increased, the maximum temperature increase increased and the decay time constant decreased. The maximum temperature increase was directly proportional to the absorption coefficient, and the decay time constant was found to be almost independent of the absorption coefficient for relatively small laser beam diameters.
Development of Organic Thin-film Transistors on a Biocompatible Parylene-C Substrate
KyungMin Kim,Sookyeong Kim,Ah-Hyun Hong,Yoojeong Ko,Hyowon Jang,Hyeok Kim,Dong-Wook Park 대한전자공학회 2023 Journal of semiconductor technology and science Vol.23 No.1
Organic thin-film transistors (OTFTs) fabricated on a biocompatible Parylene-C substrate can be applied to biosensors using a simple and cost-effective process. In this study, we developed biocompatible OTFTs by using organic materials to fabricate the substrate, gate dielectric, channel, and passivation layer. Poly(3-hexylthiophene) (P3HT) was used to fabricate the OTFTs on a Parylene-C-based platform. As the gate dielectric, Parylene-C showed promising insulation properties. Finally, we generated a cyclic olefin polymer (COP) passivation layer to protect P3HT from oxygen and moisture, and the effect of the COP passivation layer on the P3HT channel was analyzed. The proposed materials and fabrication methods will be useful for various bio-applications of OTFTs.
Graphene-Based Wireless Environmental Gas Sensor on PET Substrate
Kyungmin Na,Hyunggun Ma,Jihun Park,Junho Yeo,Jang-Ung Park,Bien, Franklin IEEE 2016 IEEE Sensors Journal Vol.16 No.12
<P>Modern gas detection systems have expanded into the monitoring of greenhouse gases, which are believed to cause global warming and are toxic to the human body. This demand has led to the development of numerous different discrete and distinct sensor technologies. A wireless sensing system is formed using the integrated arrays of field-effect transistors and sensors comprising graphene channels, silver nanowire electrodes, and interconnects with a wireless communication antenna. These carbon devices are highly flexible and can be transferred onto both planar and non-planar substrates, including papers, clothes, fingernails, and human skin. The printed wireless sensing antenna senses the gases by detecting the change in the signal produced by a change in sensor resistance.</P>
Kyungmin Kim,Sungsik Kong,Ye Inn Kim,Amael Borzee,Yoonhyuk Bae,Yikweon Jang 한국동물분류학회 2018 Animal Systematics, Evolution and Diversity Vol.34 No.1
Because of the potential negative influence on their hosts, ecto-parasites are of prime importance to numerous species. Ticks are among these, distributed worldwide, and potentially transmitting diseases while sucking blood of diverse hosts. The leopard cat (Prionailurus bengalensis euptilura Elliot, 1871) is the only felid left in the Republic of Korea following widespread anthropogenic disturbances that have resulted in the extinction of both Panthera species: the Siberian tiger (Panthera tigris altaica Temminck, 1844) and Amur leopard (P. pardus orientalis (Schlegel, 1857)). This study identifies ticks collected from a roadkill leopard cat retrieved in Seosan area in the Republic of Korea. Two ticks attached to the facial area of the carcass were identified as Japanese hard ticks, Ixodes nipponensis, based on mitochondrial cytochrome oxidase I. The matching sample was from Japan with 99.7% similarities, and the only available sequence on GenBank. This study reconfirms that I. nipponensis parasitizes the endangered leopard cat P. bengalensis euptilura.
Kyungmin Kim,Eunhee Sohn,Hyo-Deog Rim,Seoyoung Jang,Jungmin Woo 대한신경정신의학회 2020 PSYCHIATRY INVESTIGATION Vol.17 No.11
Objective The purpose of this study is to identify personality types that can influence breast cancer screening (BCS) compliance among Korean women with breast cancer using a mixed-method approach. Methods The participants consisted of 93 women who underwent surgery for breast cancer between July 2010 and March 2012. The demographic and medical characteristics of the participants were evaluated through structured interviews. To identify personality types, in-depth interviews were performed and the transcribed interviews were evaluated using interpretive phenomenological analysis. The participants were categorized into two groups (compliance and non-compliance) based on compliance with the Korean Breast Cancer Society recommendations for BCS. Results Five personality types were identified through phenomenological analysis. There were significant differences in the chi-square test results for the BCS compliance and non-compliance groups according to age (p=0.048), cancer stage (p<0.001), and personality types (p=0.018). Logistic regression showed that the odds ratio for compliance with BCS was 9.35 (p=0.01) for individuals with a cautious- organized personality type, 9.38 (p=0.02) for those with a cautious-dependent personality, and 10.58 (p=0.04) for those with a sensitive-downcast personality compared to those with a cautious personality type. Conclusion Participants with cautious-organized, cautious-dependent, and sensitive-downcast personality types were less likely to follow the BCS recommendations than those with a cautious personality type. This study provides a basis for the future development of an effective questionnaire to investigate the personality types of individuals with breast cancer in order to predict compliance with BCS.
Kyungmin Na,Heedon Jang,Hyunggun Ma,Bien, Franklin Professional Technical Group on Microwace Theory a 2015 IEEE Transactions on Microwave Theory and Techniqu Vol. No.
<P>This paper presents a new method to track the optimal efficiency of a magnetic resonance (MR)-wireless power transfer (WPT) system for biomedical capsule endoscopy. Recently, capsule endoscopy technology has been developed and emerged as an alternative to small bowel endoscopy, gastroscopy, and colonoscopy, all of which cause discomfort to patients because of their relatively large-diameter and flexible cables. However, commercialized capsule endoscopy still suffers from limited battery capacity. This paper presents a theory for tracking the optimal efficiency of an MR-WPT system, along with its experimental verification. An MR-WPT system with a 9-mm-diameter receiver is implemented, which is small enough to fit in the current capsule endoscope. The proposed system improves the efficiency despite variations in the distance, angle, and axial misalignment, with maximum increases of 2.45, 4.69, and 1.48 dB, respectively. Penetrative transfer through biological tissue is demonstrated with a low degradation in efficiency of 0.390 dB. The proposed system was found to have a very low specific absorption rate of 1.74 W/kg, which demonstrated that it is safe to use in the human body.</P>
Kim, Kyungmin,Kong, Sungsik,Kim, Ye Inn,Borzee, Amael,Bae, Yoonhyuk,Jang, Yikweon The Korean Society of Systematic Zoology 2018 Animal Systematics, Evolution and Diversity Vol.34 No.1
Because of the potential negative influence on their hosts, ecto-parasites are of prime importance to numerous species. Ticks are among these, distributed worldwide, and potentially transmitting diseases while sucking blood of diverse hosts. The leopard cat (Prionailurus bengalensis euptilura Elliot, 1871) is the only felid left in the Republic of Korea following widespread anthropogenic disturbances that have resulted in the extinction of both Panthera species: the Siberian tiger(Panthera tigris altaica Temminck, 1844) and Amur leopard (P. pardus orientalis(Schlegel, 1857)). This study identifies ticks collected from a roadkill leopard cat retrieved in Seosan area in the Republic of Korea. Two ticks attached to the facial area of the carcass were identified as Japanese hard ticks, Ixodes nipponensis, based on mitochondrial cytochrome oxidase I. The matching sample was from Japan with 99.7% similarities, and the only available sequence on GenBank. This study reconfirms that I. nipponensis parasitizes the endangered leopard cat P. bengalensis euptilura.