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최민주,이종수,김성삼,조성찬,양형석,손종수,천원기 제주대학교 공과대학 첨단기술연구소 2001 尖端技術硏究所論文集 Vol.12 No.2
In the study we measured and evaluated the acoustical property of a domestic spark gap type extracorporeal shock wave lithotripsy (ESWL). Altering the discharging medium between the electrodes of the shock wave generator (water, 1% an 10% NaCl electrolyte), we measured shock waveforms and sound pressure level (SPL). For the shock waves produced using the discharging medium, water, it was seen that the shock wave peak pressure went up to 70 MPa, and the SPL was in the range of 90 - 100 dB. As the concentration of NaCl increased in the electrolyte. the SPL did not change much and was shown to increase correlation with the discharging voltage. In the case of the discharging medium. 10% NaCl electrolyte, it was found that the shock amplitudes varied in a narrow range when being high in the concentration of NaCl and were large when being high in discharging voltages. While the stone fragmentation was in process, we measured the acoustic emission and compared their spectral properties.
냉매 충전량의 조건 변화에 따른 냉동시스템의 성능 분석
양형석(Hyeong-Seok Yang) 산업기술교육훈련학회 2014 산업기술연구논문지 (JITR) Vol.19 No.2
This study is the performance variation analysis of refrigeration systems by changing the amount of refrigerant charging quantity according to adjusting the refrigerant charging 600gram, 800gram, and 1,000gram with vapor compressional refrigeration training equipment. At 600g refrigerant charging, the superheat, outlet temperature of compressor, refrigeration effect, coefficient of performance, refrigeration capacity were higher than 1,000gram refrigerant charging, while at 1,000gram refrigerant charging, evaporating and condensing pressure, compression work, were higher than 800gram refrigerant charging condition, Thus, we could see changes of the refrigeration system performance s factor the affect of amount of between resonable refrigerant charging and over charging conditions.
Byoung-Chul Yang,Sung-Sik Kang,Chang-Seok Park,Ui-Hyung Kim,Hyeong-Cheol Kim,Gi-Jun Jeon,Sidong Kim,Seok-Dong Lee,Hyun-Jae Lee,Sang-Rae Cho 한국수정란이식학회 2015 한국동물생명공학회지 Vol.30 No.4
The aim of the study was to investigate the ability of sperm derived from the epididymis in regard to sperm motility, sperm penetration to oocyte and subsequent development of the embryo. Frozen-thawed sperm from epididymis showed similar percentage of motile sperm (VSL ≥ 25 μm/sec) as compared to that of commercial sperm (control). Sperm penetration of frozen-thawed epididymal and commercial sperm was not significantly different. Moreover, cleavage and blastocyst rates were similar in both epididymal and control. Sperm derived from the epididymis also showed fertilizability and subsequent embryonic development
Hyeong Min Park,Young Hoe Hur,Chol Kyoon Cho,Yang Seok Koh,Hee Joon Kim,Eun Kyu Park 한국간담췌외과학회 2016 Annals of hepato-biliary-pancreatic surgery Vol.20 No.4
Backgrounds/Aims: Despite hepatolithiasis being a risk factor for biliary neoplasm including cholangiocarcinoma, the incidence of underlying biliary neoplasm is unknown in patients with preoperative benign hepatolithiasis. The aim of this study was to evaluate the incidence of underlying biliary neoplasm in patients who underwent major hepatectomy for preoperative benign hepatolithiasis. Methods: Between March 2005 and December 2015, 73 patients who underwent major hepatectomy for preoperative benign hepatolithiasis were enrolled in this study. The incidence and pathological differentiation of concomitant biliary neoplasm were retrospectively determined by review of medical records. Postoperative complications after major hepatectomy were evaluated. Results: Concomitant biliary neoplasm was pathologically confirmed in 20 patients (27.4%). Biliary intraepithelial neoplasia (BIN) was detected in 12 patients (16.4%), and 1 patient (1.4%) had intraductal papillary mucinous neoplasm (IPMN), as the premalignant lesion. Cholangiocarcinoma was pathologically confirmed in 7 patients (9.6%). Preoperative imaging of the 73 patients revealed biliary stricture at the first branch of bile duct in 31 patients (42.5%), and at the second branch of bile duct in 39 patients (53.4%). Postoperative complications developed in 14 patients (19.1%). Almost all patients recovered from complications, including intra-abdominal abscess (9.6%), bile leakage (4.1%), pleural effusion (2.7%), and wound infection (1.4%). Only 1 patient (1.4%) died from aspiration pneumonia. Conclusions: The incidence of underlying biliary neoplasm was not negligible in the patients with hepatolithiasis, despite meticulous preoperative evaluations.
양진방,송형석 師範大學 體育硏究所 1996 서울大學校 體育硏究所論集 Vol.17 No.2
The twentieth century marked the first flurry of genuine academic interest in the field of sport philosophy. Many philosophical papers and books in connection with sport have been published in this century. At the beginning of this century the philosophical interest in sport was centedred upon educational problems. But since 1960 the range of the philosophical interest in sport has been enlarged. Metaphysical, epistemological, and axiological Aspekts in connection with sport have been discussed broadly and deeply. The metaphysical field consists of cosmological studies which inquired the natur of sport-world, and onthological studies which inquired the natur of human being in sport. In epistemological field the major issue is the academical demension of physical education and sport. It was until 1980 that desperate efforts which legitimated the field of physical education and sport as an academic discipline, had been made. Since 1980 new epistmological efforts which constitute a original framework of the science of physical education and sport, have been made. The axiological studies deal with the ethical, social-philosophical, and aethetical issues in relation with sport. In spite of broad and deeply studies, the field of sport philosophy has several problems awaiting solution. A lack of meta-theoritical studies in connection with the academic identity of sport philosophy, the abstract and impracticality of result of the research, narrow-mindeded empirical method of the research, and absence of lingustic studies are main problems.
Yang, Byoung-Chul,Kang, Sung-Sik,Park, Chang-Seok,Kim, Ui-Hyung,Kim, Hyeong-Cheol,Jeon, Gi-Jun,Kim, Sidong,Lee, Seok-Dong,Lee, Hyun-Jae,Cho, Sang-Rae The Korean Society of Embryo Transfer 2015 한국동물생명공학회지 Vol.30 No.4
The aim of the study was to investigate the ability of sperm derived from the epididymis in regard to sperm motility, sperm penetration to oocyte and subsequent development of the embryo. Frozen-thawed sperm from epididymis showed similar percentage of motile sperm (VSL ${\geq}25{\mu}m/sec$) as compared to that of commercial sperm (control). Sperm penetration of frozen-thawed epididymal and commercial sperm was not significantly different. Moreover, cleavage and blastocyst rates were similar in both epididymal and control. Sperm derived from the epididymis also showed fertilizability and subsequent embryonic development.
Ultrasound-guided internal jugular vein catheterization in critically ill pediatric patients
Yang, Eu Jeen,Ha, Hyeong Seok,Kong, Young Hwa,Kim, Sun Jun The Korean Pediatric Society 2015 Clinical and Experimental Pediatrics (CEP) Vol.58 No.4
Purpose: Continuous intravenous access is imperative in emergency situations. Ultrasound-guided internal jugular vein (IJV) catheterization was investigated in critically ill pediatric patients to assess the feasibility of the procedure. Methods: Patients admitted to the pediatric intensive care unit between February 2011 and September 2012 were enrolled in this study. All patients received a central venous catheter from attending house staff under ultrasound guidance. Outcome measures included successful insertion of the catheter, cannulation time, number of cannulation attempts, and number and type of resulting complications. Results: Forty-one central venous catheters (93.2%) were successfully inserted into 44 patients (21 males and 23 females; mean age, $6.54{\pm}1.06$ years). Thirty-three patients (75.0%) had neurological disorders. The right IJV was used for catheter insertion in 34 cases (82.9%). The mean number of cannulation attempts and the mean cannulation time was $1.57{\pm}0.34$ and $14.07{\pm}1.91$ minutes, respectively, the mean catheter dwell time was $14.73{\pm}2.5$ days. Accidental catheter removal was observed in 9 patients (22.0%). Six patients (13.6%) reported complications, the most serious being catheter-related sepsis, which affected 1 patient (2.3%). Other complications included 2 reported cases of catheter malposition (4.6%), and 1 case each of arterial puncture (2.3%), pneumothorax (2.3%), and skin infection (2.3%). Conclusion: The results suggest that ultrasound-guided IJV catheterization can be performed easily and without any serious complications in pediatric patients, even when performed by visiting house staff. Therefore, ultrasound-guided IJV catheterization is strongly recommended for critically ill pediatric patients.