Does Diabetes Mellitus Influence Carpal Tunnel Syndrome?

김유환,양경숙,김한준,석흥열,이정훈,손명훈,김병조 대한신경과학회 2017 Journal of Clinical Neurology Vol.13 No.3

Background and Purpose Diabetes mellitus (DM) has been proposed as a risk factor for carpal tunnel syndrome (CTS), but this remains controversial. We investigated the association between DM and CTS using both ultrasonography (US) and nerve conduction study (NCS) data. Methods We analyzed a prospectively recruited database of neuromuscular US and medical records of subjects who had undergone NCSs and electromyography for symptoms suggestive of CTS. Subjects were assigned to the follow groups: Group I, CTS with DM; Group II, CTS without DM; Group III, no CTS with DM; and Group IV, no CTS without DM. US cross-sectional area (CSA) and NCS measurements at the median nerve (MN) were compared among groups. We used a general linear mixed model to adjust for statistically significant covariates. Results The 230 participants comprised 22, 83, 19, and 106 in Groups I–IV, respectively. In multivariate analyses, the MN action potential amplitude in females was the only variable that was significantly associated with DM (p<0.001). Groups with DM tended to have a longer latency, smaller amplitude, and lower conduction velocity in the NCSs compared to groups without DM. The measured US CSA values did not differ significantly among the groups. Conclusions NCS measurements of the MN tended to differ between DM and non-DM patients regardless of the presence or absence of CTS. However, US did not reveal any statistically significant relationship between CTS and DM.

인장과 굽힘을 받는 반무한 평판내의 분기균열 해석

김유환,범현규,박치용 한국전산구조공학회 2002 한국전산구조공학회논문집 Vol.15 No.3

본 연구에서는 균일한 인장과 굽힘을 받는 반무한 평판내의 분기균열에 대하여 해석하였다. 중첩의 원리를 이용하여 인장과 굽힘을 받는 분기균열에 대하여 응력 및 모멘트 확대계수를 해석하였다. 응력확대계수는 유한요소법과 J 기저 상호매개적분을 이용하여 해석하였고, 모멘트확대계수는 균열선단의 모멘트로부터 모멘트외삽을 이용하여 계산하였다 무차원화된 응력확대계수와 모멘트확대계수에 대한 수치해석 결과는 분기균열 길이와 주균열의 비, 그리고 분기균열각의 함수로 나타내었다. A branched crack in a semi-infinite plate under uniform tension and bending moment is considered in this study By using the superposition, the stress and moment intensity factors for the branched crack subjected to uniform tension and bending moment we evaluated. The stress intensity factors we obtained by using the finite element method and the J-based mutual integral. The moment intensity factors are calculated by extrapolating the values of the moment new the crack tip. Numerical results lot the normalized stress and moment Intensity factors we shown as functions of the ratio of branched crack length to main crack length and the branching angle.

5월의 복숭아원 재배요령

김유환 한국작물보호협회 1980 자연과 농업 Vol.1 No.2

공공갈등의 사법적 해결: 의미와 한계 ―새만금판결의 분석을 중심으로―

김유환 한국행정판례연구회 2007 행정판례연구 Vol.12 No.-

신경계 질환에서 근적외선분광분석법의 적용: 기립불내증을 중심으로

김유환,백승호,Zephaniah Phillips V,석흥열,전남준,김법민,김병조 대한신경과학회 2017 대한신경과학회지 Vol.35 No.1

Near-infrared spectroscopy (NIRS), a noninvasive optical method, utilizes the characteristic absorption spectra of hemoglobin in the near-infrared range to provide information on cerebral hemodynamic changes in various clinical situations. NIRS monitoring have been used mainly to detect reduced perfusion of the brain during orthostatic stress for three common forms of orthostatic intolerance (OI); orthostatic hypotension, neurally mediated syncope, and postural orthostatic tachycardia syndrome. Autonomic function testing is an important diagnostic test to assess their autonomic nervous systems for patients with symptom of OI. However, these techniques cannot measure dynamic changes in cerebral blood flow. There are many experimentations about study of NIRS to reveal the pathophysiology of patients with OI. Research using NIRS in other neurologic diseases (stroke, epilepsy and migraine) are ongoing. NIRS have been experimentally used in all stages of stroke and may complement the established diagnostic and monitoring tools. NIRS also provide pathophysiological approach during rehabilitation and secondary prevention of stroke. The hemodynamic response to seizure has long been a topic for discussion in association with the neuronal damage resulting from convulsion. One critical issue when unpredictable events are to be detected is how continuous NIRS data are analyzed. Besides, NIRS studies targeting pathophysiological aspects of migraine may contribute to a deeper understanding of mechanisms relating to aura of migraine. NIRS monitoring may play an important role to trend regional hemodynamic distribution of flow in real time and also highlights the pathophysiology and management of not only patients with OI symptoms but also those with various neurologic diseases.

公正去來規制의 執行體制

김유환 한국공법학회 2005 公法硏究 Vol.33 No.5

Fair trade and antitrust regulations of the Republic of Korea have been based on the traditional paradigm that focuses on economic policy rather than legal legitimacy. However, this paradigm of regulations has to be reformed according to recent socioeconomic transition of R.O.K. and worldwide globalization trends. In addition, R.O.K needs to establish a strong legal system for effective fair trade and antitrust regulations in order to foster a free market economy. The key issue for the reformation is how to build a new regime for implementing fair trade regulations. This study aims to develop legal policies for establishing the new regime. There are three dimensions of the legal policies for the development of a new regime for establishing fair trade regulations. Firstly, Fair Trade Commission(FTC) of Korea should be reorganized in order to enhance its independence and fairness. For this purpose, FTC commissioners' status in the adjudication process should be equalized regardless of their administrative functions in the light of FTC's nature as a consensus organization. Personnel management system of FTC also has to be reformed with regard to this point. Secondly, administrative procedures of FTC should be changed. Procedural legal principles such as “separation of functions” and “ban on ex parte communications” should be adopted in the adjudicative procedure. Dependants' rights of defence and participation is to be protected as well. Lastly, we need to make new institutions for activating private actions with regard to fair trade and anti-trust issues.

CMOS IF PLL 주파수합성기 설계

김유환,권덕기,문요섭,박종태,유종근 대한전자공학회 2003 電子工學會論文誌-SD (Semiconductor and devices) Vol.40 No.8

본 논문에서는 CMOS IF PLL 주파수합성기를 설계하였다. 설계된 주파수합성기는 칩 외부에 LC 공진 회로를 원하는 값에 맞게 바꿈으로써 다양한 중간 주파수에서 동작 가능하다. VCO는 자동진폭조절 기능을 갖도록 설계하여 LC 공진회로의 Q-factor에 무관하게 일정한 진폭의 출력을 발생한다. 설계된 주파수분주기는 8/9 또는 16/17 dual-modulus prescaler를 포함하며, 다양한 응용분야에 적용 가능하도록 외부 직렬데이터에 의해 동작 주파수를 프로그램할 수 있도록 하였다. 설계된 회로는 0.35㎛ n-well CMOS 공정을 사용하여 제작되었으며, 제작된 IC의 성능을 측정한 결과 260㎒의 동작주파수에서 위상잡음은 -114dBc/Hz@100kHz 이고 lock time은 300㎲보다 작다. 설계된 회로는 3V의 전원전압에서 16mW의 전력을 소모하며, 칩 면적은 730㎛×950㎛이다. This paper describes a CMOS IF PLL frequency synthesizer. The designed frequency synthesizer can be programmed to operate at various intermediate frequencies using different external LC-tanks. The VCO with automatic amplitude control provides constant output power independent of the Q-factor of the external LC-tank. The designed frequency divider includes an 8/9 or 16/17 dual-modulus prescaler and can be programmed to operate at different frequencies by external serial data for various applications. The designed circuit is fabricated using a 0.35${\mu}{\textrm}{m}$ n-well CMOS process. Measurement results show that the phase noise is 114dBc/Hz@100kHz and the lock time is less than 300$mutextrm{s}$. It consumes 16mW from 3V supply. The die area is 730${\mu}{\textrm}{m}$$\times$950${\mu}{\textrm}{m}$.

M-13 박테리오파지 기반 컬러센서를 이용한 살모넬라균 검출 연구

김유환,김나영,장원석,김해정,오진우 한국환경과학회 2020 한국환경과학회 학술발표회 발표논문집 Vol.2020 No.11

졸-겔법으로 제조한 $ZrO_2$ 의 코발트 흡착량에 미치는 하소온도의 영향

김유환,김용익,배성렬 한국세라믹학회 1996 한국세라믹학회지 Vol.33 No.4

본 연구는 졸-겔법을 이용하여 알칼리 조건인 pH 10에서 제조한 ZrO2의 하소온도에 따른 분말특성과 코발트 흡착량에 미치는 하소온도의 영향에 대하여 검토하였다. 졸-겔법을 이용하여 ZrO2 분말을 제조하고, 600, 800, 1000, 1200, 140$0^{\circ}C$로 하소한 후, X-선 회절법, SEM, BET 방법, Fourier transform 적외선(FT-IR), 열중량 및 열시차분석법(TG-DTA)등을 이용하여 특성을 분석하였다. 알칼리조건인 pH 10에서 제조한 ZrO2는 하소온도가 $600^{\circ}C$일때 고온수에서 코발트 흡착량이 가장 우수하였으며, 이때 $600^{\circ}C$로 하소한 ZrO2의 비표면적은 24.03m2/g이였으며 25$0^{\circ}C$의 고온수에서 코발트 흡착량은 0.16m-eq/g이였다. ZrO2 gel was prepared under pH 10 alkaline condition by sol-gel process and was investigated as a function of calcination temperature and effect of calcination temperature on cobalt adsorption capacity. The ZrO2 powder prepared by sol-gel process was calcined at 600, 800, 1000, 1200, 140$0^{\circ}C$ and analyzed by X-ray diffractometry. SEM specific surface area by BET nitrogen adsorption FT-IR and TG-DTA technique. It was shown that cobalt adsorption capacity of ZrO2 prepared under pH 10 alkaline condition and then calcined at $600^{\circ}C$ in high temperature was determined to be larger than that of ZrO2 at various calcination temperature. The specific surface area of ZrO2 calcined at $600^{\circ}C$ was 24.03m2/g and cobalt adsorption capacity at 25$0^{\circ}C$ high-temperature water was 0.16m-eq/g.

장애인 신체상에 대한 탐색

김유환,추근도 한국체육철학회 2008 움직임의철학 : 한국체육철학회지 Vol.16 No.2

Body Image is a blueprint of a person's physique which was formated in one's mind. It is a multi-dimensional concept which can express personal feelings and attitudes of his or her appearance and physical ability. The significance of body image for persons with disability from the sport field as follows. First, the inquiry of variables related to body image for persons with disability need to get out of fragmentary suggestions and need to consider as a simultaneous, coexistent, development intentional, and whole status. The characteristics of persons with disability has been expressed in various ways depend on the social cultural contexts within their own special quality. Second, a sport has contributed to establish the foundation of developing valuable theory through participating sport activities and helping to understand persons with disability better via explanation and description of meanings and subjective structures of disability awareness which was grasped with one's subjectivity. A sport also has served as a base of public concept without flection of body image to construct the overall social environment rather than the concept of specially planed education program. Third, in sport phenomenon, body image has been expressed on the base of cognition structure of persons without disability rather than the position of persons with disability. Reconsideration of body value of persons with disability is necessary to embody proper body image. Findings from this investigation is suggested that the trend of body image for persons with disability is helping persons with disability have righteous body understanding and obtain values of their own body. At the same time, disability sports play important role to expand social service project in our society. In addition, the trend will become a theoretical foundation to build programs for activation of disability sports. 신체상은 마음에서 형성된 자신의 신체에 대한 청사진으로 자신의 외모와 신체기능에 대해 주관적인 느낌이나 태도를 표현하는 다차원적 개념이다. 스포츠가 장애인의 신체상에 주는 의의는 다음과 같이 제시할 수 있다. 첫째, 장애인의 신체관과 관련된 변수규명을 단편적으로 제시하는 것에서 벗어나 스포츠를 통한 동시적, 공존적, 총체적, 발달 지향적 현상으로 보며 장애인 나름대로 장애 인식의 독특한 특성을 지니고 있으며 사회문화적 맥락에 따라 다양하게 나타나고 있다는 것이다. 둘째, 스포츠는 우리사회에서 장애인식을 개개인의 주관성에 따라 파악하여 그 구조와 의미를 기술, 설명하여 준다. 그리고 스포츠는 장애인 신체상에 대한 이해를 돕고 장애인의 스포츠 활동을 통하여 가치 있는 이론개발을 할 수 있는 바탕이 되는데 기여하며, 또한 스포츠는 장애인을 위한 특별한 교육으로서의 중요성보다는 누구나 공감하고 현실적으로 장애인에 대한 신체상에 굴곡이 없는 환경을 조성하는데 있다. 셋째, 스포츠현상에서 신체상은 장애인 입장보다는 비장애인의 인식구조를 기초로 하여 신체상을 표현하고 있다. 그러나 올바른 장애인 신체상을 구현하기 위해 장애인의 신체에 대한 가치와 이해가 필요하다는 것이다. 본 연구의 결과에서 발견된 장애인 신체인식의 나아갈 바는 ‘장애인’에 대한 신체상을 스포츠와 관련된 몸에 대한 이해와 가치를 가질 수 있도록 함과 동시에 우리사회에서 장애인스포츠가 복지사업 분야에서 중추적인 역할을 할 수 있도록 장애인스포츠 활성화를 위한 방안 마련에 이론적 기초가 되었으면 한다.