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First record of the beetle family Clambidae (Coleoptera: Scirtoidea) in Korea
송정훈,안기정 국립중앙과학관 2017 Journal of Asia-Pacific Biodiversity Vol.10 No.2
The beetle family Clambidae, represented by Clambus formosanus japonicus Endrödy-Younga, is identified for the first time in Korea. A habitus photograph, diagnosis, and illustrations of diagnostic characters of the species are provided.
십이지장 협착으로 인한 위출구폐쇄에 의해 악화된 식도칸디다증 및 효모위석 발생 1예
송정훈,이은빈,박남선,강병국,진대호,안태홍,한윤주,이규철,이형석 대한소화기내시경학회 2007 Clinical Endoscopy Vol.34 No.4
Esophageal candidiasis is the most common disease among all candida infections of the gastrointestinal tract, and generally develops in immunocompromised patients. The prevalence of esophageal candidiasis has increased in patients undergoing antibiotic therapy, diabetes, adrenal dysfunction, alcohol intoxication, old age, esophageal injury, esophageal stasis, gastric surgery, and acid suppressive therapy. However, the overall prevalence is not higher than that of immunocompromised patients. Gastric candidiasis is uncommon because of the strong acidity of the gastric juices. The most common clinical setting for gastric candidiasis is in patients with neoplastic disease. However, there are some case reports suggesting an increase in the prevalence of gastric candidiasis after gastric ulcer therapy with surgery or acid suppressive agents. Delayed gastric emptying, increased intragastric pH, and reflux of the duodenal contents into the stomach are factors indicative of the pathophysiology of gastric candidiasis after gastric surgery. We encountered a case of aggravated esophageal candidiasis and the formation of a gastric yeast bezoar following a gastric outlet obstruction due to a duodenal stenosis. We herein report this case along with an overview of the relevant literature. (Korean J Gastrointest Endosc 2007;34:205-209) 식도칸디다증은 칸디다에 의한 위장관 감염 중 가장 흔하며 HIV 감염 및 기타 면역 억제 상태에서 호발한다. 광범위 항생제 치료, 당뇨병, 부신기능장애, 알코올중독, 고령, 부식성 식도손상, 식도저류, 위수술 및 위산억제제에 의한 저염산증 등이 식도칸디다증을 유발한다는 보고가 있지만 면역억제상태의 환자에 비해 그 유병률은 높지 않다. 위칸디다증은 위액의 산도가 높아 유병률이 낮고 보통 종양성 질환 환자에서 발생하지만 소화성 궤양의 수술적 치료 및 위산억제제의 사용이 위칸디다증의 유병률을 증가시킨다는 보고도 있다. 수술 후 위칸디다증의 발생 기전으로는 위배출 지연, 위내 산도 저하 및 십이지장 내 물질의 위내 역류 등으로 추측되고 있다. 본 증례에서는 만성 십이지장 궤양에 의한 위출구폐쇄 및 식도염이 있던 75세 남자에서 식도칸디다증이 악화되고 효모위석이 발생한 1예를 경험하였기에 문헌고찰과 함께 보고하는 바이다.
송정훈,박종진,Song, Jung-Hoon,Park, Jong-Jin 대한기계학회 1996 大韓機械學會論文集A Vol.20 No.11
Compared to a full three dimensional FEM, the Slab-FEM hybrid method reduces the required computation time distinctly and it can be applied to the analysis of a shape rolling process. However, the method is somewhat approximate and predictions by the method contain certain inaccuracies. In the present investigation a parameter called T-factor was introduced to compensate the inaccuracies of the method and proper values of the parameter were estimated for different widths of bars and reduction ratios. Then, the method was applied to analyze cold and hot rollings of rectangular bars and predicted results were compared to those of experiments. Nonuniform distributions of temperature in the bars were predicted by utilizing the temperature equation obtained for a semi-infinite solid under radiation and convection boundary conditions. It was found out that accuracies of spread and roll separating force predictions could be enhanced by using proper values of the T-factor.
SI 기관에서 초기 화염의 생성 및 성장에 대한 모델링
송정훈,선우명호,Song, Jeonghoon,Sunwoo, Myoungho 대한기계학회 1999 大韓機械學會論文集B Vol.23 No.2
In spark ignited engines, the electrical spark not only sets the time for the onset of combustion but also is able to greatly influence the character of the initial flame growth and the subsequent combustion, and thereby can influence engine performance. The relative importance of the ignition energy is particularly high under lean or high residual gas or exhaust gas recirculation (EGR). In this study, a modeling of flame Initiation and its development is proposed. Submodels consist in representing of cylinder pressure and temperature, heat transfer to cylinder wall, and flame kernel heat transfer to ambient air and to spark plug electrodes. The breakdown process and the subsequent electrical power input initially control the kernel growth while intermediate growth is mainly dominated by diffusion or conduction. Then, the flame propagates by the chemical energy, and laminar and turbulent flame velocity.
가시화를 이용한 정적연소기에서 점화장치가 화염전파에 미치는 영향에 관한 연구
송정훈,선우명호,Song, Jeong-Hun 대한기계학회 2000 大韓機械學會論文集B Vol.24 No.12
A visualization study using the schlieren method is adopted in an optically-accessible, cylindrical constant volume combustion chamber to identify the mechanism of ignition energy and ignition system interaction in spark ignited, lean gasoline-air mixture. In order to research the effects of ignition system on flame propagation, two kinds of ignition system are designed, and several kinds of spark plugs are tested and evaluated. To control the discharge energy, the dwell time is varied. The initial flame development is quantified in terms of 2-D images which provides information about the projected flame area and development velocity as a function of ignition system and discharge energy. The results show that high ignition energy and extended spark plug gap can shorten the combustion duration in lean mixtures. The material, diameter and configuration of electrodes the flame development by changing the transfer efficiency from electrical energy to chemical energy and discharge energy. However these factors do not affect of flame development as much a ignition energy or extended gap does.