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휴대용 시스템을 위한 고효율 PWM DC-DC Buck 변환기
강남구(Nam-Gu Kang),황인호(In-Ho Hwang),유성목(Seong-Mok Yu),박종태(Jong-Tae Park),유종근(Chong-Gun Yu) 대한전기학회 2010 정보 및 제어 심포지엄 논문집 Vol.2010 No.10
In this paper, we describe a current-mode DC-DC buck converter which operates in the input voltage range of 2.5~3.5V and load current up to 800㎃. It has been designed using a 0.35㎛ CMOS technology. The DC-DC converter design has been focused on minimizing the current consumption of the control circuits and a zero current sensing circuit is employed to improve the converter efficiency at light load condition. The converter designed using a 0.35㎛ CMOS technology exhibits a maximum power efficiency of 97.6% and output voltage ripple less than 2㎷. Its chip size is 1.53㎜×1.2㎜ including PAD.
Subsyndromal Anxiety Disorder의 특징과 임상적 중요성
강남인,양종철,Kang, Nam-In,Yang, Jong-Chul 대한생물정신의학회 2011 생물정신의학 Vol.18 No.4
Subsyndromal anxiety disorder indicates mental states of having anxiety symptoms not fulfilling criteria for anxiety disorders. Despite of the lack of previous objective findings of the subsyndromal anxiety disorder, its clinical importance has increased. It can cause many kinds of clinical anxiety symptoms and functional disabilities. But the early intervention and early treatment make it possible not only to attenuate the anxiety symptoms and functional disabilities but also to prevent disease progression to a full syndromal anxiety disorder. In this article, we will review the previous studies about the subsyndromal anxiety disorder and discuss its clinical characteristics and importance.
자궁경부암의 방사선치료 후 방사선대장염 발생의 위험인자
강남용(Nam Young Kang),김주성(Joo Sung Kim),우홍균(Hong Gyun Wu),김병관(Byeong Gwan Kim),남상민(Sang Min Nam),장은정(Eun Jeong Jang),정현채(Hyun Chae Jung),송인성(In Sung Song) 대한소화기학회 2002 대한소화기학회지 Vol.40 No.4
Background/Aims: Radiation therapy is an effective treatment modality for uterine cervix carcinoma. The adverse effects, however, can be seen as acute and chronic colitis, which may lead to serious complications including fistula, bleeding, and stricture. The aim of this study was to evaluate the clinical characteristics of radiation- induced colitis and analyze the predictive factors of chronic bowel complications. Methods: All 192 consecutive patients were enrolled from January 1995 to April 1998. The characteristics of acute and chronic complications were analyzed retrospectively. The acute and chronic complications were graded according to EORTC/RTOG grading criteria. Risk factors of chronic colitis were obtained by univariate and multivariate analyses. Results: Of 192 patients, 142 (74%) developed acute bowel complications (38/grade I, 93/II, and 11/III). The common symptoms were diarrhea, abdominal pain, and nausea. Fifty-six (29%) of the 192 patients developed chronic bowel complications (23/grade I, 10/II, 11/III, and 12/IV). In univariate analysis, age, body mass index, hypertension, abdominal surgery, and intracavitary radiation (ICR) were statistically significant in the development of chronic colitis. Multivariate analysis revealed that ICR had the greatest prognostic significance. Conclusions: The patients treated with ICR have a high probability of developing chronic radiation-induced colitis. A meticulous follow-up is needed to manage these patients promptly. ( Korean J Gastroenterol 2002; 40: 247-254)
열기계적 피로에 따른 단결정 니켈기 초내열합금의 변형 및 파괴거동
김인수 ( In Soo Kim ),강정구 ( Jeong Gu Kang ),조창용 ( Chang Yong Jo ),홍현욱 ( Hyun Uk Hong ),강남현 ( Nam Hyun Kang ),최백규 ( Baig Gyu Choi ) 대한금속재료학회(구 대한금속학회) 2011 대한금속·재료학회지 Vol.49 No.2
The out-of-phase thermo-mechanical fatigue (OP TMF) in a <001> oriented single crystal nickelbased superalloy CMSX-4 has been studied. OP TMF life was less than a half of low cycle fatigue(LCF) life in spite of a small hysteresis loop area of OP TMF compared to that of LCF. The failure was caused by the initiation of a crack at the oxide-layered surface followed by its planar growth along the <100> γ channel in both LCF and OP TMF. However, deformation twins appeared near the major crack of OP TMF. The multiple groups of parallel twin plates on {111} planes provided a preferential path for crack propagation, which caused a significant decrease in OP TMF life. Additionally, the analysis on the surface crack morphology revealed that the tensile strain at the minimum temperature of OP TMF was found to accelerate the crack propagation.