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Chanjoong Choi,Taeseung Lee,Seung-Kee Min,Ahram Han,Song-Yi Kim,Sang-il Min,Jongwon Ha,In Mok Jung 대한외과학회 2017 Annals of Surgical Treatment and Research(ASRT) Vol.93 No.2
Purpose: Intermittent claudication is the most common early symptom of peripheral arterial occlusive disease. Walking impairment questionnaire (WIQ) is a short, inexpensive, easy-to-complete questionnaire to assess intermittent claudication and can provide data of usual walking. The purpose of this study is to validate the new Korean version of WIQ. Methods: Total 51 patients with claudication were enrolled. While 4 patients were dropped out, 47 patients with claudication into were divided groups based on the treatment received: surgery (n = 33) and medication (n = 14). The surgery group was subdivided into the bypass (n = 13) and intervention (n = 20) groups. WIQ score, ankle-brachial index (ABI), and treadmill test scores were assessed initially and after 12 weeks. Results: The WIQ scores were significantly correlated with ABI and pain-free walking distance (PFWD) and maximum walking distance (MWD) in all groups (except for MWD in the intervention group). Speed and stair-climb scores (2 WIQ domains) were well correlated with ABI, PFWD, and MWD. Distance scores were mostly correlated with ABI, PFWD, and MWD in all groups except ABI in the bypass and intervention groups and MWD in the bypass group. Reproducibility was observed in all groups (intraclass correlation coefficient > 0.8). Conclusion: The Korean version of the WIQ is valid and reproducible, and can be effectively used to assess Korean patients with intermittent claudication.
Midterm Outcome of Kidney Transplantation From Donors With Thin Basement Membrane Nephropathy
Choi, Chanjoong,Ahn, Sanghyun,Min, Seung-Kee,Ha, Jongwon,Ahn, Curie,Kim, Yonsu,Lee, Hajeong,Min, Sang-il Wolters Kluwer Health, Inc. All rights reserved. 2018 Transplantation Vol.102 No.4
<P>Conclusions Kidney transplant donors with TBMN and their recipients maintained their renal function through midterm follow-up without significant complications. Therefore, kidney transplantation from donors with TBMN could be a safe option.</P>
물성테이블 기반 보간 알고리즘을 이용한 작동유체의 열역학적 물성 계산에 대한 연구
김찬중(Chanjoong Kim),최상미(Sangmi Choi),임현정(Hyunjeong Lim),조연주(Yeonjoo Cho),김민성(Minsung Kim) 대한설비공학회 2017 대한설비공학회 학술발표대회논문집 Vol.2017 No.6
Modern thermal energy systems are required for being smarter and more intelligent in connection with information and communication technology (ICT) to perform multiple functions. To achieve this goal, a number of complicated property calculations are essential. The refrigerant property calculation program REFPROP developed by NIST is most popularly used, however, direct use of REFPROP for low-end ICT devices are too heavy to be equipped. In this manner, an alternative computational method to calculate refrigerant property from thermodynamic tables is developed. As two steps of the procedure, machine-friendly thermodynamic tables are generated from REFPROP first, and then quadrilateral interpolation is carried out for intermediate properties. The results showed competitiveness of the interpolation method compared with the original calculation from REFPROP. From the research, the generation of thermodynamic tables is found to be important to increase its accuracy and reliability of property calculation.
냉각장치를 이용한 헤드램프 습기 억제 시스템 개발을 위한 연구
김찬중(Chanjoong Kim),최경덕(Kyungduk Choi),고민수(Minsu Ko) 한국자동차공학회 2019 한국자동차공학회 학술대회 및 전시회 Vol.2019 No.11
While studies on the fogging in the headlamp so far have focused on fogging removal, this study suggests ways to suppress the generation of fogging. We have understood the mechanism of fogging to improve fogging performance in the headlamp system. and the relationship between the temperature of the headlamp housing and the fogging performance has been found by analyzing the thermal characteristics of vehicles. Finally, the method of controlling the fogging suppression using water was proposed in the humid conditions and the analysis was performed.
전기 외장램프 환경조건 변화 분석 및 그에 따른 제품 개발방향과 시험평가법 제안
김찬중(Chanjoong Kim),김경희(Kyunghee Kim),최경덕(Kyungduck Choi),정재훈(Jaehoon Jeong),고민수(Minsu Ko) 한국자동차공학회 2023 한국자동차공학회 학술대회 및 전시회 Vol.2023 No.11
In developing and evaluating automobile parts, the environmental conditions of automobiles are the most important. In particular, in the case of exterior lamps, the development standards are very different depending on the environmental conditions of the vehicle because consumers can directly respond to parts conditions under both thermal stress from the engine and vibration stress from the vehicle body. Therefore, with the recent expansion of electric vehicles, advantages and disadvantages arise by applying the test conditions of internal combustion engines when developing parts. For example, in terms of thermal conditions, it is advantageous because there is no engine heat, and in terms of noise, it is disadvantageous because there is no engine noise. In terms of vibration, the structure and weight of the vehicle are different compared to vehicles of the same class, and the characteristics are different. Therefore, by re-researching and applying these conditions for lamps dedicated to electric vehicles, it is possible to bring cost advantages and prepare for consumer claims in advance. In this study, the environmental conditions of exterior lamps for these electric vehicles are reanalyzed and product development direction and test evaluation method that can be differentiated from internal combustion engines is proposed.