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무월경 환자의 DITI와 HRV, 체성분 분석을 통한 특성 연구
정재혁,이진무,이창훈,조정훈,장준복,이경섭,Jeong, Jae-Hyuk,Lee, Jin-Moo,Lee, Chang-Hoon,Cho, Jung-Hoon,Jang, Jun-Bock,Lee, Kyung-Sub 대한한방체열의학회 2009 대한한방체열의학회지 Vol.7 No.1
Purpose : The purpose of this study is investigate the characters of DITI, HRV and Body composition analysis in Amenorrhea. Methods : We studied 47 patients visiting OO hospital from 1st October 2007 to 19st September 2009. The subjects were categorized in two groups, amenorrhea group(26) and normal group(21). We studied the difference of DITI, HRV and Body composition analysis between two groups by Mann-whitney test using SPSS for windows(version 12.0). Results : there is not statistically significant difference of DITI, HRV and BMI between amenorrhea group and normal group. But there is statistically significant difference of percent body fat and waist-hip ratio between amenorrhea group and normal group. Conclusion : Percent body fat and Waist-Hip ratio of amenorrhea groups is lower than normal groups. Percent body fat and Waist-Hip ratio can be diagnosis index.
장대 터널 내 구난역의 열차 화재 시 제연을 위한 1D-3D 연계 해석
정재혁(Jae Hyuk Jung),허남건(Nahmkeon Hur),이정표(Jung-Pyo Lee),김진곤(Jin Kon Kim) 대한설비공학회 2010 설비공학 논문집 Vol.22 No.10
In the present study a 1D-3D numerical simulation was performed to analyze the fire safety in a rescue station of a long railroad tunnel equipped with a mechanical ventilation. The behavior of hot air was studied for the emergency operation mode of ventilation system in case of fire in the rescue station. The 1D simulation was carried out for entire tunnel region. Detailed 3D CFD simulation was performed for the rescue station area in the central region of the tunnel by using the result of the 1D simulation as the boundary condition of the 3D simulation. Various type of cross passage installation were evaluated for the prevention of smoke diffusion to suggest the optimized interval of the cross passages in the rescue tunnel.
토크컨버터의 성능 예측 정확성 향상을 위한 열유동 해석기법 연구
정재혁(Jae Hyuk Jung),이명성(Myungsung Lee),허남건(Nahmkeon Hur),장재덕(Jae Duk Jang),홍순석(Soon Seok Hong) 한국유체기계학회 2009 유체기계 연구개발 발표회 논문집 Vol.2009 No.-
Recently, the steady and transient incompressible viscous turbulent flow is simulated for performance prediction of a torque converter with various numerical methods. In the previous study, even though the transient analysis requires substantial computational resource than that of steady analysis, both the steady and transient analysis predicted fairly accurate results with the experimental data. In the present study, the influence of viscosity variation on prediction of performance was investigated by thermo-fluid analysis. Flow regions of each parts of entire torque converter are modeled for the analysis by using the polyhedral mesh. The thermo-fluid analysis shows more accurate result than fluid analysis on the capacity factor.
코퍼스 기반 번역 연구에서의 연어 관계 검증 : 통시 패턴 편차로 보완한 장르 패턴 편차 분석
정재혁(Jung, Jaehyuk) 한국통번역교육학회 2020 통번역교육연구 Vol.18 No.3
This paper demonstrated the ability of the Genre-specific Frequency Deviation Index to detect collocations that involve peculiarities and thus require translators to take a more careful approach when attempting to make sense of what they mean and use them in their translation work. To this end, the top 30 collocations of the adjective swift and nouns were listed in terms of frequency of use using the Corpus of Contemporary American English (COCA) and then subject to qualitative analysis. Among them were proper nouns and ones predominantly used in specific fields or contexts, and these collocations were found to exhibit a relatively high Genre-specific Frequency Deviation Index. Thus, a diachronic approach was considered, and an index called the Diachronic Frequency Deviation Index was newly devised which represents how different the frequency of these collocations in each of the time periods defined in COCA is from the corresponding frequency pattern of the adjective swift. The effectiveness of this index was then examined and confirmed.
정재혁(JaeHyuck Jung),최세완(Sewan Choi),이정민(JungMin Lee) 전력전자학회 2006 전력전자학술대회 논문집 Vol.- No.-
본 논문에서는 유도가열용 전원장치의 역률을 개선함으로써 효율을 극대화 시킬 수 있는 새로운 기법을 제안한다. 일반적으로 유도가열 부하의 경우 전기적인 특성상 Q(quality factor) 값이 매우 크므로 인해 전원장치에서 공급되는 대부분의 전력은 위상차에 따른 무효전력이며 더불어 입력전류 고조파에 의한 무효전력도 포함되어 있다. 이러한 무효전력 성분을 보상하기 위해 유도가열용 전원장치 인버터부에 역률보상용 콘덴서를 부착하고 적절하게 운전하여 위상차에 따른 무효전력 성분을 보상할 수 있다. 또한 컨버터부에 간단한 보조회로를 추가하여 입력전류의 고조파를 제거함으로써 고조파에 의한 역률도 개선 할 수 있을 뿐만 아니라 고조파로 인해 야기되는 문제도 사전에 차단할 수 있다.