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바이오디젤 축소 메커니즘의 저온산화반응 개선 및 3-D 엔진 해석
서현규,서현규,송윤석,임영찬,박인강 한국연소학회 2022 한국연소학회지 Vol.27 No.4
This study was conducted to improve errors such as low-temperature heat release, ignition delays, and exhaust emissions that occurred during the mechanism reduction process. To achieve this, the error of the reduced mechanism was improved by modifying the A-factor of the important reaction in the selected combustion process through the analysis of the reaction path of 0D CVC. As a result of the 3D CFD analysis, the NOx error rate of the improved mechanism decreased from 92% to 14%, the ignition delay error decreased by 2% on average, and the low temperature and NTC regions, which were the key targets, decreased by 6%.
의료산업체 수요맞춤형 물리치료교육과정 개발에 관한 연구
서현규,이재홍,권원안,Seo, Hyun-Kyu,Lee, Jae-Hong,Kwon, Won-An 대한고유수용성신경근촉진법학회 2012 PNF and Movement Vol.10 No.3
Purpose : This research has been studied physical therapy curriculum according to the demands of the medical institution. Methods : The subjects of this study were 88 physical therapists. The subjects were divided by OS(n=41) and NS(n=47) group. The results of research were analyzed using independent t-test with average and standard deviations as the statistical methods for data analysis. Results : the results of the study were as follow : First, it was needed on the development planning for physical therapy curriculum according to the demands of the medical institution. Second, tests of independent t-test were a statistically significant difference between OS and NS group on the demands of the medical institution. Third, it was needed that time tables on physical therapy curriculum were partially regulated by the demands of the medical institution. Conclusion : We suggest to change the curriculum of physical therapy. It is more accurately reflected the rigor of the high-quality education preparation needed for current and future practice.
서현규,권원안,양경한 대한물리치료학회 2000 대한물리치료학회지 Vol.12 No.1
This study shows that menstrual pain is decreased conspicuously or disappeared completely after appliying taping therapy to the patients who had menstrual paid but could not find special treatments for it. The study also indicates that the taping therapy helped the patients who had s long menstrual period to have the period reduced, and who had a short period to have it prolonged. All the phenomena of menstruation were inclined to maintain equlibrium due to the taping therapy, Therefore, it is believed that the taping therapy, which is one of the alternative medical fields, will minimize menstrual pain with the medical therapy.
초음파와 관절가동기법이 측두하악관절의 가동범위에 미치는 영향
서현규,김한수,김상수,이동호,김승준,정현애,배성수,Seo, Hyun-Kyu,Kim, Han-Soo,Kim, Sang-Soo,Lee, Dong-Ho,Kim, Seung-Joon,Jeong, Hyun-Ae,Bae, Sung-Soo 대한물리치료학회 2001 대한물리치료학회지 Vol.13 No.3
This study was carried out from 1 November 2000 to 29 March 2001 and objects are 20 college students located Taegu area. Also to determine effect of ultrasound and manipulation on temporomandibular joint pain and limited range of motion. Results obtained were as follows 1. The mean value of open mouth rate are ultrasound group more high than manipulation group between two group until first visiting treatment, but after second visiting treatment tend to increased manipulation group. We are find out that mean are reciprocal action between two group and visiting times 2. Rate of open mouth are almost same between two group, but after 3 times, manipulation group are more effect than ultrasound group. There are no significantly difference(P<.005) between rate of open mouth due to the treatment times(P<;.ool ) and two group. 3. The mean value due to the treatment times have tendency to increased on the left and right lateral motion mean. but no statistical significantly difference between two group. Also two group have effects according to treatment times, but no significantly difference between two group.
Experimental Investigation of Nozzle Cavitating Flow Characteristics for Diesel and Biodiesel Fuels
서현규,박수한,이창식 한국자동차공학회 2008 International journal of automotive technology Vol.9 No.2
This study was performed to clarify criteria for cavitation inception and the relationship between flow conditions and cavitation flow patterns of diesel and biodiesel fuels. The goal was to analyze the effects of injection conditions and fuel properties on cavitating flow and disintegration phenomena of flow after fuel injection. To accomplish this goal, it was utilized a test nozzle with a cylindrical cross-sectional orifice and a flow visualization system composed of a fuel supply system and an image acquisition system. In order to analyze the rate of flow and injection pressure of the fuel, a flow rate meter and pressure gauge were installed at the entrance of the nozzle. A long distance microscope device equipped with a digital camera and a high resolution ICCD camera were used to acquire flow images of diesel and biodiesel, respectively. The effects of nozzle geometry on the cavitating flow were also investigated. Lastly, a detailed comparison of the nozzle cavitation characteristics of both fuel types was conducted under a variety of fuel injection parameters. The results of this analysis revealed that nozzle cavitation flow could be divided into four regimes: turbulent flow, beginning of cavitation, growth of cavitation, and hydraulic flip. The velocity coefficient of diesel fuel was greatly altered following an increase in flow rate, although for biodiesel, the variation of the velocity coefficient relative to the rate of flow was mostly constant. The cavitation number decreased gradually with an increase in the Reynolds number and Weber number, and the discharge coefficient was nearly equal to one, regardless of cavitation number. Lastly, it could not observe cavitation growth in the tapered nozzle despite an increase in fuel injection pressure. This study was performed to clarify criteria for cavitation inception and the relationship between flow conditions and cavitation flow patterns of diesel and biodiesel fuels. The goal was to analyze the effects of injection conditions and fuel properties on cavitating flow and disintegration phenomena of flow after fuel injection. To accomplish this goal, it was utilized a test nozzle with a cylindrical cross-sectional orifice and a flow visualization system composed of a fuel supply system and an image acquisition system. In order to analyze the rate of flow and injection pressure of the fuel, a flow rate meter and pressure gauge were installed at the entrance of the nozzle. A long distance microscope device equipped with a digital camera and a high resolution ICCD camera were used to acquire flow images of diesel and biodiesel, respectively. The effects of nozzle geometry on the cavitating flow were also investigated. Lastly, a detailed comparison of the nozzle cavitation characteristics of both fuel types was conducted under a variety of fuel injection parameters. The results of this analysis revealed that nozzle cavitation flow could be divided into four regimes: turbulent flow, beginning of cavitation, growth of cavitation, and hydraulic flip. The velocity coefficient of diesel fuel was greatly altered following an increase in flow rate, although for biodiesel, the variation of the velocity coefficient relative to the rate of flow was mostly constant. The cavitation number decreased gradually with an increase in the Reynolds number and Weber number, and the discharge coefficient was nearly equal to one, regardless of cavitation number. Lastly, it could not observe cavitation growth in the tapered nozzle despite an increase in fuel injection pressure.
경부통 증상자에게 Mulligan technique과 TENS 적용 후 관절가동범위에 미치는 영향
서현규,공원태,Seo, Hyun-Gyu,Gong, Won-Tae 대한정형도수물리치료학회 2010 대한정형도수물리치료학회지 Vol.16 No.2
Purpose : The purpose of this study was to compare Mulligan technique with Transcutaneous electrical nerve stimulation(TENS) in persons with neck pain. Methods : Twenty subjects with neck pain participated in the experiment. All subjects randomly assigned to the Mulligan technique group and TENS group. Both groups receive treatment(Mulligan technique: all areas 8 times once, TENS : 100Hz 15 minute once) 3 times during 2 weeks. And LEX was used to measure range of motion of neck. All measurement of each subject were measured at pre-treatment and post-treatment. Results : 1. All areas of range of motion of neck were significantly increased (p<0.05). 2. These data suggest that Mulligan technique and TENS are beneficial to increase all areas of range of motion of neck. 3. Comparing with two groups, Mulligan technique increases all areas of range of motion of neck more than TENS and appeared significant difference statistically. Conclusion : Mulligan technique is more effective than TENS to increse range of motion in persons with neck pain.