ZVS를 이용한 풀 브릿지 단일 전력단 고주파 공진 AC-DC 컨버터의 특성해석

남승식,황계호,오경섭,원재선,조규판,김동희 嶺南大學校 工業技術硏究所 2003 工業技術硏究所論文集 Vol.31 No.2

This paper proposes a single-stage high frequency resonant AC-DC converter using zero voltage switching with high input power factor. The proposed high frequency resonant converter ingegrates a half bridge boost rectifier as power factor corrector(PFC) and half resonant converter into a single stage. The input stage of the half bridge boost converter is working in discontinuous conduction mode(DCM) with constant duty cycle and variable switching frequency. Therefore, high power factor is achieved naturally. The results of simulation using the Pspice have demonstrated the feasibility of the proposed AC-DC converter. The proposed converter will be able to be practically used as power supply.

전기 치수 검사 시 역치 자극 이후 과용(過用) 자극 시간의 측정

남기창,안선희,김수찬,김덕원,이승종 大韓齒科保存學會 2004 Restorative Dentistry & Endodontics Vol.29 No.3

Use of electric pulp testing elicits painful response in vital teeth. In this study, we examined the excessive time from pain feeling to stimulation disconnection in clinical situation. D626D (Parkell Inc., USA.) scan type electric pulp tester was used in total of 23 young healthy individuals. Each of the right central incisors and first premolars were used as testing teeth. Stimulation disconnection was achieved by EMG in anterior belly of digastric muscle, finger span, and voice and the excessive stimulation time over the sensory threshold was recorded. As a result, we found that the short responses before the stimulation disconnection appeared following order: EMG, finger span, and voice. The EMG disconnection is suggested to be used to reduce the excessive stimulus time in electric pulp testing.

집쥐에 의한 슴새 번식성공률 감소

남기백,유승화,김동원,유정칠 경희대학교 한국조류연구소 2002 연구보고 Vol.8 No.1

본 조사는 2001년 6월 25일부터 30일, 8월 12일부터 17일, 10월 20~25일까지 제주도 북제주군 추자면에 위치한 사수도에서 집단 번식하는 슴새의 번식성공률을 조사하였다. 현재 사수도에는 약 4000쌍 정도의 슴새가 번식을 하는 것으로 조사되었다. 총 110개의 둥지를 관찰한 결과, 부화률은 약 15%로 나타났으며, 전체 번식성공률은 약 3%로 나타났다. 전체 번식실패률은 96.4%로 나타났으며, 번식실패 요인으로 집쥐에 의한 포식이 92.5%로 가장 높게 나타났다. 또한 포란기와 부화기에 포식률이 각각 42%, 36%로 육추기의 포식률(11%)보다 높게 나타났다. The rate of breeding success of Streaked Shearwaters (Calonectris leucomelas) was studied at Sasu-islet, in chuja-do, cheju island during 25-30 June, 12-17 August, 20-25 October 2001. The breeding population of Streaked Shearwaters at Sasu-islet is estimated to be about 4,000 pairs. This study was based on detailed observations of 110 nests dispersed over a wide range of nest habitats within colony. Hatching success was 15% (n=17), breeding success was 3% (n=3) and breeding failure was 96% (n=106). Norway Rat(Rattus norvegicus) were responsible for failure of at least 89% of all the breeding failure. The predation rates of both incubation and hatiching periods was higher than that of rearing period.

김시종 시 연구 : 탈식민적 전략으로서의 공간 탐구

남승원 이화어문학회 2015 이화어문논집 Vol.37 No.-

재일 시인 김시종은 디아스포라의 삶을 살아오면서 경계에 대한 예민한 감각과 유민의 기억을 바탕으로 창작 활동을 해왔다. 특히, 지배자들의 질서와 논리로 구성되는 기록의 왜곡에 맞서 구체적인 대항 공간의 탐색과 그 내부에 충격을 주는 언어에 대한 탐구는 남다른 의미를 가지고 있다. 말하자면 그는 표준어의 구심력에서 자유로운 언어와 또 그 언어를 사용하는 민중들의 거주공간에 대한 인식을 통해서 현실을 지배하고 재배치는 힘에 균열을 일으키고 있는 것이다. 재일 조선인의 대명사이기도 한 오사카의 재일 조선인 거주지역 이카이노에 관심을 기울이고, 행정 편의에 따라 이제는 이름조차 사라져버린 그곳을 되살리고자 하는 노력은 그 구체적인 결과물이라고 할 수 있다. 이 같은 태도는 김시종의 문학 세계를 구성하는 가장 근원적인 지점이라고 할 수 있는데, 그의 대표작인 장편시집 니이가타 에 가장 잘 드러나 있다. 거대한 역사적 흐름을 바탕으로 하고 있는 이 시집에서 김시종은 고통스러운 현실을 이겨낼 수 있는 것으로 모든 사람들의 참여를 바탕으로 한 노력과 더불어 현실의 경계를 넘는 월경(越境)의 상상력을 한결같이 드러내고 있다. Kim Si-Jong makes poetry with sense of boundary and displaced memory as Korean Residents in Japan. Especially space and language research against the ruling class is a meaningful his own way. This way makes the rift within logic of domination by free language escapes from standard and space reside displaced people. Kim Si-Jong focused on Ikaino, Osaka city represents Korean Residents in Japan this meaning of he wants people turn attention to erase name by ruling power. The Niigata, his masterpiece also includes same critical mind. The Niigata based on historical consciousness and signified imagination of cross boundary could be possiblity overcome difficulty with participation of all the people.

人體 胃癌 및 胃炎에서의 CEA의 表現에 對한 免疫酵素 組織學的 硏究

元南熙,李大一,白承龍 고려대학교 의과대학 1982 고려대 의대 잡지 Vol.19 No.3

Carcinoembryonic antigen (CEA) isolated from adenocarcinomata of human digestive system and fetal or embryonic gut tissue is one of tumor associated antigens. In recent years, extensive studies to detect CEA in the blood as well as in the tissue of various conditions have been reported. However, characterization of CEA in the tissue of stomach cancer, common malignant tumor in Korea, has rarely been investigated. The author performed peroxidase-antiperoxidase immunohistologic study with anti-CEA antibody to determine the presence of CEA in 51 cases of gastric adenocarcinoma and 18 cases of chronic gastritis. All tissues examined were obtained with endoscopic biopsy, fixed in 10% formalin and embedded in paraffin. The findings were analysed and results obtained are as following. 1. CEA positive reaction to anti-CEA antibody was noted in 45 of the 51 cases with gastric cancer (88.2%). 2. Patterns of positive reaction to anti-CEA antibody of 45 CEA positive adenocarcinomas were focal in 9 cases (20.0%), moderate in 10 cases (22.2%) and diffuse in 26 cases (57.8%). 3. Comparing the pattern of CEA positive reaction with histologic differentiation of cancer cell, the differentiated type showed diffuse linear pattern along membrane the surface and undifferentiated type revealed focal positive pattern in the cytoplasm. 4. Of 18 cases with chronic gastritis, 8 cases of non-specific gastritis and 10 cases of intestinal metaplasia, CEA poistive reaction to anti-CEA antibody was noted in 4 cases at the lesion of intestinal metaplasia. The results obtained above suggest that presence of CEA in gastric cancer is detected 88% of cases, variable in pattern, partly depending on morphologic differentiation, and even exhibit in goblet cells in some intestinal metaplasia which is believed to be a precancerous condition of stomach cancer.

간경화를 가진 환자의 척추 수술 후 발생한 급성 간부전 : 증례보고 A case report

김형남,최준석,박천희,이철승,김원태 全南大醫大 2001 전남의대학술지 Vol.37 No.4

Fe-Ni-C 합금의 Ausforming처리에 의한 기계적성질의 변화

백승남,강조원 조선대학교 동력자원연구소 1987 動力資源硏究所誌 Vol.9 No.1

The ausformed martensite obtained from austenite with various deformation degrees in Fe-30% Ni-0.25% C alloy was transformed to reversed austenite at 500℃ by cyclic reverse martensitic transformation. The effects of prior deformation and number of cyclic transformation on the microstructure, mechanical properties of reversed austenite were investigated. The results obtained are summarized as follows : 1) Prior deformation degrees applied below A_d point raises A_f point.A_f points of ausformed martensites in this alloy are from 475 C to 486 C with prior deformation degrees. 2) The strength of reversed austenite is higher than that of original austenite without prior deformation. This is considered to be due to the higher dislocation density and grain size refinement. 3) The yield strength of reversed austenite below 25% prior deformation is higher than that of deformed austenite, but above 25% prior deformation, the yield strength of the reversed austenite is lower than that of the deformed austenite. 4) The strength of reversed austenite is more increased with the number of cyclic transformation, especially it is principally strengthened at the first cyclic transformation and the strengthening effect is more remarkable in yield strength than in ultimate tensile strength.

十全大補湯의 免疫增强 및 抗癌 效果

崔承勳,吳旼錫,宋泰元,남기열 대전대학교 한의학연구소 2002 혜화의학회지 Vol.11 No.1

Objectives : Sipjundaebo-tang is prepared by ten medical herbs that tone the blood and vital energy, and strengthen health. This prescription has long been used traditionally against anemia, anorexia, extreme exhausion and fatigue. The purpose of this thesis was to review the effects of Sipjundaebo-tang that are about immunopotentiation effects, antitumor activities and potentiation, detoxification of antitumor drugs Methods : We studied the research methods and results of experiments which were selected from Korean, Japaness and American theses were on the topic of immunopotentiation effects, antitumor activities and potetiation, detoxification of antitumor drugs from Sipjundaebo-tang Results and conclusions : Sipjundaebo-tang not only potentiates the effects of the combined use of chemotherapy, but also reduces and elimimate the immunotoxicity of antitumor drugs and radiotherapy. And it strengthen immunity and improve QOL, S/OH of cancer patients.

Sheehan 증후군 발생한 Torsades de Pointes

김승환,김남호,김용철,최준호,박은미,이상재,이은미,유남진,윤경호,오석규,정진원 圓光大學校 醫科學硏究所 2008 圓光醫科學 Vol.23 No.1

재발하는 심실 빈맥으로 내원한 환자에서 Sheehan 증후군을 진단하였고, 적절한 호르몬 보충 치료 후 심전도 이상이 정상으로 회복된 예를 경험하였기에 문헌고찰과 함께 보고하는 바이다. Torsades de Pointes is a form of polymorphic ventricular tachycardia that is associated with prolongation of QT intervals, characterized by QRS complexes of progressively changing ampulitude and cyclic length, giving the appearance of oscillations around the baseline. A 77 years-old woman was presented with hypotention and arrhythmia. Twenty four-hour ECG showed typical episodes of torsades de pointes with QT prolongation. This arrhythmia was controlled by isoproterenol and magnesium infusion, but it was not disappeared. She was diagnosed as Sheehan's syndrome by past history, anterior pituitary stimulation test and empty sella on CT scan. After hormone replacement treatment, Prolonged QT interval was normalized and polymorphic ventricular tachycardia has not recurred. We report a case of torsades de pointes associated with Sheehan's syndrome

생활환경온도와 착의량이 기초대사에 미치는 영향

李元子,沈揆男,金鎭先,朴承順 복식문화학회 2000 服飾文化硏究 Vol.8 No.3

This study investigated the relation between seasonal variation of total clothing weight, room, outdoor temperature and basal metabolic rate in man. The basal metabolic rate and total clothing weight, room temperature was determined seasonal for a period of two years and grouped four seasons. Subjects (adults volunteers) who live in seoul and mokpo were compose 120 subjects The results were obtained as follows. Seasonal outdoor temperature was difference of seoul and. mokpo. But room temperature in apartments was a little difference than private house. Total-clothing weight is showed seasonal variations at the seoul, private house than at the mokpo, apartment.. The basal metabolic rate is suggested there in gender difference in the basal metabolic rate (P〈.001). The basal metabolic rate increased gradually with the peak of winter sespectively and deceased again todward summer. The difference of between basal metabolic rate in summer and winter was significant room temperature, of seoul and private house, and light total clothing weight