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초저변형 윤곽경화를 위한 1㎿ 이중주파수 유도가열시스템 개발
성병기,김종환,안규상,정재우,성환진 한국소성가공학회 2016 단조 심포지엄 Vol.2016 No.6
윤곽경화 표면경화처리는 표면의 굴곡이나 형상에 따라 균일하게 표면을 경화시키는 기술이며, 주로 기어류와 같은 동력전달 부품의 표면경화를 통한 내피로성ㆍ내마모성 향상에 활용된다. 이들 부품의 표면경화처리에는 주로 고주파열처리, 침탄열처리, 질화열처리 등이 적용되고 있다. 컨투어 표면 경화기술을 적용하기 위해 1MW급 이중주파 표면경화 공정경화 공정기술을 개발하는 것에 목적을 두었다. 제안된 시스템의 타당성을 검증하기 위해 1MW급 이중주파수 시스템을 개발하였고 균일한 윤곽경화 표면경화처리 기술을 구현하였다.
공진주파수 추종 직렬공진형 고효율 유도.가열장치에 관한 연구
성병기,박성준,김광태,김철우 한국조명전기설비학회 1999 조명·전기설비학회논문지 Vol.13 No.3
본 연구는 고주파 직렬공진 인버어터를 이용한 20[kHz],10[kHz]급 고효율 유도가열장치에 관한 것이다. 치가열체인 부하변동에 대해서는 인버어터의 직류 입력 전압을 가변시키고 인버어터 스윗칭을 공진 주파수를 추종해 동작시킴으로써 무료전력을 최소화 할 수 있는 회로 구성을 제시하였다. 그리고 시뮬레이션과 실험을 통해 유도가열장치의 인버어터 역률이 약0.96으로 양호함을 알 수 있었다. The object of the present study is to obtain a 20[kHz], 10[kW] rating, high efficiency induction heating system by high frequency serises-resonant inverter. Proposed is a topology that minimize a reactive power, by which direct iOIrt voltage is variable corresponding to the variation of the load, heated-object, and by which the switching of inverter is forced to follow a resonant frequency. And assured that the power foctor of the inverter in a induction heating system is proper about O.96 through the simulation and results.esults.
Carcinoma Showing Thymus-Like Differentiation (CASTLE)치험 1예
김진평,성병기,안성기,이정희 대한이비인후과학회 2004 대한이비인후과학회지 두경부외과학 Vol.47 No.5
Carcinoma showing tymus-like diferentiation (CASTLE)and surounding soft tisue, or soft tissue of the neck. It originates from ectopic thymus or branchial pouch remnants. The histolo-gic finding shows that the tumor is divided into lobules of variable size and shape, cord with thin and thick fibrous septa, which are infiltrated by lymphocytes and plasma cells. Tumor cells consist of large vesicular nuclei, prominent nucleoli, and abundant cyto-lymphoepithelioma of thymus. We report a case of CASTLE that we treated by surgery and radiation therapy.
전시영,성병기,김진평,안성기,박정제,정재호 대한비과학회 2006 Journal of rhinology Vol.13 No.2
Background and Objectives:An understanding of the cross-sectional structures and histological features of experimental animals is necessary for conducting the research of rhinosinusitis in experimental animals. The aim of this study is to determine the most suitable cross-sectional level of rhinosinusitis in a rat model. Materials and Methods:The study examined the histological features of the mucosal epithelium, gland, lymphoid tissue, and vomeronasal organs using 4 week-old male rats weighing 60-70 g as test subjects. Whole mounted sinus-nose complexes were divided into four levels of areas which were sectioned according to the coronal plane and each section was stained with hematoxylin-eosin and observed under light microscopy. Results:Level I revealed the nasal turbinate, maxilloturbinale, and nasolacrimal duct. Level II revealed the nasal turbinate, maxilloturbinale, vomeronasal organ, and nasolacrimal duct. Level III revealed the ectoturbinale I, II, endoturbinale II, III, maxillary sinus, Steno’s gland, maxillary sinus gland, and nasal associated lymphoid tissue (NALT). Level IV revealed the ectoturbinale II, endoturbinale III, IV, pharyx respiratorius, and NALT. The lining epithelia were squamous, respiratory and olfactory. However, the squamous epithelium was not observed in level III and IV. Conclusion:The Level III appears to be the most suitable for the rhinosinusitis animal rat model since we can observe the respiratory epithelium lined sinonasal airspace including the maxillary sinus and NALT.
Single-Stage PFC AC/DC Full Bridge Converter의 소프트 스위칭에 관한 연구
임경내(Kyoung-Nae Lim),성병기(Beang-Gee Sung),계문호(Moon-Ho Kye),권순재(Soon-Jae Kwon),김철우(Cheul-U Kim) 전력전자학회 1998 전력전자학술대회 논문집 Vol.- No.-
This paper proposes a new soft switching single stage AC/DC full bridge converter with unit power factor and isolated output. This circuit shows that it is possible to combine the boost converter which is for PFC(Power Factor Correction) and full bridge converter which is for DC/DC converter. A simple auxiliary circuit which includes neither lossy components nor active switches eliminates ringing of secondary side of the transformer. The characteristics of proposed circuit are investigated and the validity is verified by the simulation results.<br/> <br/>
비부비동염 흰쥐모델의 비 과민반응에 있어서 유도형 산화질소 합성효소의 역할
김진평,전시영,안성기,황원효,성병기,김은아 대한이비인후과학회 2003 대한이비인후과학회지 두경부외과학 Vol.46 No.1
Background and Objectives:Hyper-responsivenes to nonspecific stimuli is a characteristic finding of all allergic diseases. It the whole mechanism has not been clearly established. We aimed to understand the role of inducible nitric oxide synthase (iNOS) expresion in nasal hyper-responsivenes of rhinosinusitis. Materials and Method:1) To develop a platelet activating factor (PAF)-induced rhinosinusitis rat model, 50 μl of 16 μg/ml PAF was applied into the nose of rats. At days 1, 3 and 5, the rats were killed. 2) μl of 10 μM capsaicin was applied intranasaly and the amount of microvascular leakage in the nasal mucosa was measured with Evans blue asay at days 1, 3 and 5 in the rhinosinusitis model and the control rats. 3) To examine the efect of iNOS, 75 mg/kg of aminoguanidine was pretreated systemicaly 1 hour before the application of capsaicin. 4) To localize the expresion of iNOS, immunohistochemical staining was performed using the avidin-biotin-peroxidase method with an anti-iNOS antibody. Results:Induction of rhino-ium, varied according to the time interval, were observed. A significant enhancement of microvascular leakage was clearly demon-strated by topicaly applied capsaicin, which was completely blocked by aminoguanidine, the iNOS inhibitor in the PAF-induced rhinosinusitis. The expression of iNOS was localized in the inflamatory cells infiltrated in the mucosa. Conclusion:The expression of iNOS in the inflamatory cells as well as epithelial damage related to eosinophil infiltration may cause nasal hyper-responsivenes. (Korean J Otolaryngol 203 ;46 :35-41)
김현성,전시영,안성기,김진평,박정제,정재호,성병기,강윤식 대한이비인후과학회 2005 대한이비인후과학회지 두경부외과학 Vol.48 No.6
Background and Objectives:An experimental model of bacterial rhinosinusitis is essential to study the pathogenesis of rhinosinusitis.To our knowledge, there hasnt been an experimental model using rats for bacterial rhinosinusitis, where Staphylococcusaureus is directly inoculated to the rat nose. Staphylococcus aureus is also a predominantly isolated bacterial pathogen in theepisode of acute rhinosinusitis. The aim of this study was to develop a rat model of rhinosinusitis induced by Staphylococcus aureus,ATCC 25923. Subjects and Method:The infected Sprague-Dawley rats (4-6 week-old male) were applied intranasally with40 μl of Staphylococcus aureus, ATCC 25923, which corresponds to 108 colony-forming units per milliliter, which in turncorresponds to a No. 1 McFarland turbidity by spectrophotometer (VITEK, USA). After the 2nd, 5th, and 14th day, the ratswere killed respectively. Results:Nasal sinuses were then observed at low power field (×40) for changes in the amount ofinflammatory cell clusters in the sinus cavity. There were significant differences in the number of inflammatory cell clustersbetween the infected and control rats (p<0.05). The infected rats killed at the 5th day had significantly more inflammatory cellclusters within the sinus cavities (p<0.05). Conclusion:Staphylococcus aureus induces acute bacterial rhinosinusitis in rats asmeasured by increased inflammatory cell clusters. This study demonstrates the efficacy of a rat model of acute bacterial rhinosinusitis