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Woong Cheul Lee,Weon Jin Ko,Jun-Hyung Cho,Tae Hee Lee,Seong Ran Jeon,Hyun Gun Kim,Joo Young Cho 대한소화기내시경학회 2014 Clinical Endoscopy Vol.47 No.2
Recently, increasingly invasive therapeutic endoscopic procedures and more complex gastrointestinal surgeries such as endoscopic mucosalresection, endoscopic submucosal dissection, and novel laparoscopic approaches have resulted in endoscopists being confrontedmore frequently with perforations, fistulas, and anastomotic leakages, for which nonsurgical closure is desired. In this article, we presentour experiences with the use of over-the-scope clip (OTSC) for natural orifice transluminal endoscopic surgery (NOTES) closure, preventionof perforation, anastomotic leakages, and fistula closures. The OTSC is a valuable device for closing intestinal perforations and fistulas,for NOTES closure, and for the prevention of perforation after the excision of a tumor from the proper muscle layer. Furthermore, itseems to be quite safe to perform, even by endoscopists with little experience of the technique.
가솔린 직접분사엔진의 흡기과급에 따른 성층화 연소에 미치는 영향
박형철(Hyung-Cheul Park),김미로(Mi-Ro Kim),조남효(Nam-Hyo Cho) 한국자동차공학회 2002 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2002 No.5_1
The effects of pressure charge on combustion stability and emissions have been analyzed in a GDI single cylinder engine. A late injection mode of stratified condition at 1200~2400rpm was tested and the charge pressure ratio was increased up to 1.5: 1. In-cylinder CFD analysis has been also performed to understand in-cylinder flow and fuel spray behavior. With a higher charge pressure ratio and a constant air-fuel ratio of 40:1 IMEP was increased greatly due to the increased amount of intake air mass. ISFC was improved by increasing the engine load, and the limiting stratification zone was extended to a higher engine speed, but a stable ignition timing zone was limited. ISCO was increased slightly with the increase of IMEP while ISHC was decreased. Intercooling was not used in this study but natural air cooling by a long flexible intake hose, therefore an appropriate turbocharging condition should be studied further to understand the effect of charge intake temperature on NOx emissions etc.
전기화학적 가속 부식 평가법에서 강재의 부식 손상에 미치는 인가전류밀도의 영향
이정형(Jung-Hyung Lee),박일초(Il-Cho Park),박재철(Jae-Cheul Park),김성종(Seong-Jong Kim) 한국표면공학회 2016 한국표면공학회지 Vol.49 No.5
In this study, we investigated the corrosion damage characteristics of steel for offshore wind turbine tower substructure using an accelerated electrochemical test. The galvanostatic corrosion test method was employed with a conventional 3 electrode cell in natural sea water, and the steel specimen was served as a working electrode to induce corrosion in an accelerated manner. Surface and cross-sectional image of the damaged area were obtained by optical microscope and scanning electron microscope. The weight of the specimens was measured to determine the gravimetric change before and after corrosion test. The result revealed that the steel tended to suffer uniform corrosion rather than localized corrosion due to active dissolution reaction under the constant current regime. With increasing galvanostatic current density, the damage depth and surface roughness of surface was increased, showing approximately 25 times difference in damage depth between the lowest current density (1 ㎃/㎠) and the highest current density (200 ㎃/㎠). The gravimetric observation showed that the weight loss was proportionally increased with increment of current density that has 75 times different according by experimental conditions. Consequently, uniform corrosion of the steel specimen was conveniently induced by the electrochemically accelerated corrosion technique, and it was possible to control the extent of the corrosion damage by varying the current density.
경북지역 재래산양의 세균성, 바이러스성 설사병 병원체 검출률 조사
손준형 ( Jun-hyung Sohn ),도재철 ( Jae-cheul Do ),조길재 ( Gil-jae Cho ) 한국동물위생학회 2016 한국동물위생학회지 (KOJVS) Vol.39 No.1
The purpose of this study was to survey on infection status of pathogens of diarrhea from Korean indigenous goat. A total of 800 fecal samples was collected from 50 farms from January to October 2015 and was tested by automatic biochemical machine and polymerase chain reaction (PCR). The overall detection ratio of bacterial pathogens was 22.4% and viral pathogens was 16.3%, respectively. The detection ratio of Escherichia coli (E. coli), Salmonella spp., bovine viral diarrhea virus (BVDV), rotavirus and coronavirus were 21.5%, 0.9%, 7.6%, 5.6% and 3.0%, respectively. In the rates of mixed detection, single was 78.2%, double 8.4%, triple 11.6% and quadruple 1.8% in each sample and 38%, 12%, 16%, 20% in each farm, respectively.
The Effect of Prostaglandin $F_2{\alpha}$ on Semen Collection Training in Boars
Ryu, Jae-Weon,Cho, Kyu-Ho,Lee, Joo-Hyung,Son, Jung-Ho,Chung, Ki-Hwa,Kim, In-Cheul The Korean Society of Animal Reproduction 2007 Reproductive & developmental biology Vol.31 No.4
The objective of this study was to determine the effect of administration of Prostaglandin $F_2{\alpha}$ ($PGF_2{\alpha}$) on semen collection training and semen characteristics in sexually inexperienced boars. Boars were moved individually to a semen collection pen and were trained to mount dummy sow. During the first and second semen collection secessions, 4 out of 17 boars and 4 out of remaining 13 boars allowed collection of semen. The 9 boars that failed semen collection from first 2 attempts received immediately 15 mg of $PGF_2{\alpha}$ i.m. (intramuscular injection) upon entering the collection pen for semen collection resulted in successful semen collection from all 9 boars. Total numbers of spermatozoa were higher in $PGF_2{\alpha}$ treated boars but there was no significant difference in % motility kinematics characteristics between control and $PGF_2{\alpha}$ treated groups during 72 hr period. Overall, administration of $PGF_2{\alpha}$ in sexually inexperienced boars increased the sex drive and facilitated the mounting activity to the dummy sow for semen collection.