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다중채널 LED 백라이트를 위한 Capacitor-Diode 전류평형 회로
박성한(Sung-Han Park),정영진(Young-Jin Jung),홍성수(Sung-Soo Hong),한상규(Sang-Kyoo Han) 전력전자학회 2011 전력전자학술대회 논문집 Vol.2011 No.7
최근 저전력 소모와 얇은 두께, 무 수은, 다양한 색 표현력, 빠른 응답 속도 등의 다양한 장점을 가진 LED(Light Emitting Diode)를 광원으로 이용하는 LCD(Liquid Crystal Display) TV가 큰 주목을 받고 있다. 이러한 LCD TV의 화면을 균등한 휘도로 표현하기 위해 기존의 구동회로는 다 채널의 LED를 정전류로 제어하는 DC/DC 컨버터가 채널마다 각각 적용되었고, 이는 원가 상승 및 효율 저하의 원인이 되었다. 이를 해결하기 위하여 본 논문에서는 각 LED 채널에 적용되는 DC/DC 컨버터 없이 트랜스포머, 커패시터, 다이오드를 이용하여 모든 LED 채널의 정전류 제어가 가능한 저가격형 구동회로를 제안한다. 이는 전력변환 효율과 전력밀도를 획기적으로 개선할 수 있고 수동소자만을 사용하므로 높은 신뢰성을 확보할 수 있다. 본 논문에서는 제안된 회로에 대한 이론적 해석과 실험을 통해 제안 회로의 타당성을 검증한다.
급성 출혈성 직장 궤양의 임상적 그리고 내시경적 특징소견과 재출혈의 위험인자
박성한 ( Sung Han Park ),김태오 ( Tae Oh Kim ),이정남 ( Jung Nam Lee ),유현석 ( Hyun Seok You ),류동엽 ( Dong Yup Ryu ),이봉은 ( Bong Yun Lee ),송근암 ( Geun Am Song ) 대한장연구학회 2009 Intestinal Research Vol.7 No.1
Background/Aims: Acute hemorrhagic rectal ulcers (AHRUs) are rare and have not been thoroughly studied. This study aimed to assess the clinical and endoscopic characteristics of AHRUs and to determine the risk factors for rebleeding after the initial management. Methods: Thirty patients who underwent colonoscopy within 48 hours of the onset of hematochezia were consecutively enrolled between January 2004 and December 2007. The patients were divided into a rebleeding group and a non-rebleeding group according to presence of recurrent bleeding after initial management. We analyzed the clinical features, including the underlying disorder, the Karnofsky performance status (PS), the use of anticoagulant or antiplatelet agents, the endoscopic findings, and the methods used for hemostasis. Results: All of the patients were elderly, in a bedridden status, and all had experienced the sudden onset of massive, fresh rectal bleeding without pain. The characteristics of the lesions on colonoscopy included solitary or multiple rectal ulcers, or Dieulafoy lesions located in the distal rectum. There were no differences between the two groups based on mean age, gender, use of anticoagulant or antiplatelet agents, PS, methods of hemostasis, and clinical outcomes. The PT (INR) and endoscopic findings (Dieulafoy types), however, differed significantly between the two groups (p=0.024 and p=0.013, respectively). Conclusions: When massive hematochezia occurs in bedridden patients with severe comorbid illnesses, AHRUs should be considered in the differential diagnosis. It is advisable to be vigilant for rebleeding in patients with prolongation of the PT (INR) and Dieulafoy-type ulcers on colonoscopy. (Intest Res 2009;7:8-13)
천안시 주민들의 주택보유형태 및 주택점유형태 결합선택 분석
박성휘(Park, Sung-Hwie),한종호(Han, Jong-Ho),이성렬(Lee, Sung-Ryul) 한국산학기술학회 2011 한국산학기술학회논문지 Vol.12 No.4
본 연구는 다항로짓분석을 이용하여 천안시 주민들의 가구별 주택특성 및 사회경제적 변수가 주택보유형태 및 주택점유형태의 결합선택에 미치는 영향을 분석하고자 한다. 분석 결과, 자가-비아파트에 살고 있는 가구는 주로 오랜 기간 지역을 지켜온 원주민들의 특성을 나타내고 있음을 확인할 수 있었다. 또한 임대-아파트에 거주하는 가구 는 수도권 거주경험도 가지고 있으며 언제든지 수도권으로의 이전을 생각하여 자가 주택을 구입하지 않는다는 것을 알 수 있었다. 한편 가구의 다양한 사회경제적 변수가 주택선택에 영향을 미침을 알 수 있었는데, 예를 들어 가구주 의 연령이 높을수록, 그리고 거주기간이 길고, 학생 수가 많을수록, 임대주택보다는 자가주택을 선호하였다. This study explores the plausible socio-economic variables that influence joint choice of tenure and dwelling type in Cheonan. For estimating these joint choice models, multinomial logit framework is employed. Following the practice of other studies, we chose the age of householder, education level of householder, occupation of householder, residence duration in Cheonan, experience of capital area residence, plan of capital area move and the monthly income of household as socio-economic variables, and size of house, access of subway area, residence area as house characteristics. According to the estimation result, we can derive som implications. For example, the higher monthly income of household, more member of student, bigger size of house, longer residence duration of Cheonan, the more they prefer owing house apartment to renting it. In addition, as householders are older, size of house is bigger, they prefer owing-non apartment to owing house-apartment.
연계 교육 활성화를 위한 예비대학 프로그램 개발에 관한 연구
박성종(Sung Jong Park),한명석(Myoung Seok Han),김정순(Jeong Soon Kim),박덕현(Deok Hyun Park),김갑일(Kab Il Kim) 대한공업교육학회 1998 대한공업교육학회지 Vol.23 No.1
The purpose of this study was to modify the bridge course especially for active 2+2 articulation educational program. The bridge course was assessed through the survey on opinions of technical high school teaches and bridge course graduates. Through this study (1) not only technical skills(technical contents) but also coping skills(to help students to learn how to cope with new challenges and prepare them for life long learning), (2) the basic set of skills it takes to transfer from one jobs or area of work to another, were suggested and prototypes of bridge course were developed.
호산구증가증 환자에서 Toxocara canis에 대한 특이 IgE 항체의 진단적 의의
박한정 ( Han Jung Park ),최성진 ( Sung Jin Choi ),김현미 ( Hyun Mi Kim ),최길순 ( Gil Soon Choi ),성준모 ( Jun Mo Sung ),이진우 ( Jin Woo Lee ),예영민 ( Young Min Ye ),박해심 ( Hae Sim Park ) 대한천식알레르기학회 2009 천식 및 알레르기 Vol.29 No.2
Background: Toxocariasis is one of the major causes of peripheral eosinophilia and it provokes eosinophilic infiltration in the internal organs. Diagnosis of toxocariasis has relied mainly on the immunological methods including measurement of serum specific IgG to Toxocara canis excretory-secretory antigen (TES-Ag) in which the detection rate by ELISA was 68% in patients with eosinophilia. Objective: The aim of this study is to measure serum specific antibodies to TES-Ag in patients with peripheral eosinophilia in order to evaluate the clinical significance. Method: Twenty-one patients with peripheral eosinohilia (>500 cells/uL or >10% of total white blood cell count), who have no identifiable cause of eosinophilia such as drugs, well known parasite infection, malignancy or allergic diseases, were enrolled. Serum specific IgE, IgG1 and IgG4 antibodies to TES-Ag were determined by ELISA (Phadia, Uppsala, Sweden) which were compared to those of specific IgE by immunoCAP system (Phadia), and specific IgG to TES-Ag by ELISA (Bordier). Serum total IgE and ECP levels were measured by immunoCAP system. Result: The detection rate of serum specific IgE by ELISA was the highest (90.5%) followed by serum specific IgG1 (65%) and IgG4 (75%). Concordance rate of specific IgE by ELISA and immunoCAP was 100%, while that between specific IgE by ELISA (home-made) and specific IgG by ELISA (Bordier) was 60%. The most commonly involved organ was liver (57.1%). Serum total IgE level in patients with liver involvement was significantly higher than those without it (P<0.01). Conclusion: Toxocariasis should be considered as one of the major causes of the patients with eosinophilia in this country. Measurement of serum specific IgE to TES-Ag may be useful to evaluate the Toxocara canis infection. (Korean J Asthma Allergy Clin Immunol 2009;29:105-111)