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이범재,황의환,노재성,홍성수 忠南大學校 産業技術硏究所 1996 산업기술연구논문집 Vol.11 No.2
The effect of particle size of Al powder and water repellent agent on frost resistance, absorption ratio and structure of micropore was examined to improve the physical properties and durability of ALC. The compressive strength and the tensile strength are increased and independent of water repellent agent when the specific gravity is increased in the range from 0.4 to 0.7. According as the added amount of water repellent agent was increased, frost resistance was improved and absorption ratio was decreased. ALC produced from fine Al powder has a low volume reduction by scaling and a sound apperance after freezing/thawing test and top surface freezing test. The results from this research can be expected to be utilized for stabilization and growth of ALC industry.
Subchronic Inhalation Toxicity of iso-Butylalcohol in Rats
Jang, Beom-Su,Lim, Jong-Hwan,Yun, Hyo-In,Park, Jong-Il,Ha, Chang-Su,Kim, Jong-Choon,Kim, Hyeon-Yeong,Chung, Yong-Hyun,Jeong, Jae-Hwang The Korean Society of Toxicology Korea Environment 2000 Toxicological Research Vol.16 No.4
The purpose of this study is to investigate toxic effects of iso-butylalcohol (iBA) in Sprague-Dawley (SD) rats under the exposure of 6 hours a day, 5 days a week for 13 weeks by inhalation, and to evaluate the occupational safety of iBA in comparison with the permissible exposure level (PEL) stipulated by the Occupational Safety and Health Administration (OSHA). iBA did not induce any abnormal changes from the aspects of clinical signs, feed consumption, ophthalmic test, urinalysis, hematology and blood chemistry during and at the terminal of the inhalation toxicity tests. We did not find any abnormal findings in the gross and microscopic observations due to the inhalation of iBA. There was no alteration in relative organ weights by the inhalation of iBA. No observed adverse effect level (NOAEL) of iBA was considered to be more than 3,000 ppm in rats under the inhalation of 6 hours a day, 5 days a week for 13 weeks. Fifty ppm of iBA, the PEL regulated by OSHA, is too conservative for working places. As iBA showed no abnormal observations in all the experimental parameters at any concentration under this experimental condition, we suggest that 150 ppm is safe enough for the PEL of iBA in the working areas, even taking into onsideration that OSHA lowered the PEL to 50 ppm for fear of the probable risk of its skin irritation.
윤덕로,강대희,이승준,주영수,박진구,황호영,황필규,황은주,황예원,성주헌,홍순범,황승식,황재욱,조수헌 大韓産業醫學會 1998 대한직업환경의학회지 Vol.10 No.1
Industrialization has introduced various working systems into the modern society. Shift work is a good representative among those. So far various adverse health effects, possibly caused by this shift work, have mainly been reported in the fields of manufacturing industry by many other researchers ; sleep disorders, gastrointestinal disorders and cardiovascular disorders and so on, These health effects were thought to be caused by the changes of circadian rhythm on shift working. This study was especially planned to evaluate effects of shift work on sleep disorders among shift-working medical manpower like hospital nurses, important persons dealings with lives, and ultimately to provide them with basic evidence for improving work environment. The study subjects were arbitrarily selected among shift-working female nurses and day-working female pharmacists in one university hospital in Seoul, and finally 79 nurses and 58 pharmacists were enrolled. The research was conducted by using self-administered questionnaire, consisting of items about socio-behavioral factors including demographic factors which can affect sleep patterns and questions which make it possible to evaluate sleep disorders(e.g. sleeping duration, sleep latency, re-sleep latency, days of insomnia per week, drug use for sleep, and subjective symptoms). The result showed that the shift workers had significantly longer sleep and re-sleep latency, more days of insomnia, and a stronger likelihood of using drugs when they had sleep difficulty than day-working pharmacists. And the number of night shift duties per month was discovered as the only significant predictor of sleep latency. Additionally, the subjective symptoms related to sleep disorders when awake and at work, showed negligible differences between the shift workers and dayworkers. In conclusion, we found shift-work was risk factor for sleep disorders.
Hwang, Sun-Hwi,Park, Do Joong,Kim, Hyung-Ho,Hyung, Woo Jin,Hur, Hoon,Yang, Han-Kwang,Lee, Hyuk-Joon,Kim, Hyoung-Il,Kong, Seong-Ho,Kim, Young Woo,Lee, Han Hong,Kim, Beom Su,Park, Young-Kyu,Lee, Young-J The Korean Gastric Cancer Association 2022 Journal of gastric cancer Vol.22 No.2
Purpose: Laparoscopic proximal gastrectomy with double-tract reconstruction (LPG-DTR) is a function-preserving procedure performed for treating upper early gastric cancer (EGC). However, few studies have compared the outcomes of LPG-DTR with those of laparoscopic total gastrectomy (LTG). This study aimed at comparing the short-term outcomes of LPG-DTR between LTG and upper EGC. Materials and Methods: For upper-third EGC, a multicenter, prospective, randomized trial was performed to compare those who underwent LPG-DTR with those who underwent LTG. Short-term outcomes, including clinicopathologic results, morbidity, mortality, and postoperative courses, were evaluated using a full analysis set based on the intention-to-treat principle and the per-protocol set. Results: Of the patients, 138 who fulfilled the criteria were randomized to each group. One patient in the LPG-DTR group withdrew consent. Sixty-eight patients underwent LPG-DTR and 69 underwent LTG. The operative time (LPG-DTR=219.4 minutes; LTG=201.8 minutes; P=0.085), estimated blood loss (LPG-DTR=76.0 mL; LTG=66.1 mL; P=0.413), and the morbidity rate (LPG-DTR=23.5%; LTG=17.4%; P=0.373) between the groups were not significantly different. No mortality occurred in either of the study groups. Two weeks post operation, the Visick scores for postprandial symptoms, including reflux symptoms, were not significantly different between the groups (P=0.749). Laboratory findings on postoperative day 5 were not significantly different between the groups. Conclusions: The short-term outcomes of LPG-DTR for upper EGC were comparable to those of LTG.
Hwang, Jun Ho,Lee, Ki Beom,Kim, Min Su,Lee, Seong Ro,Kim, Hasuck,Kim, Hyo Jin,Lee, Gae Ho 한국분석과학회 1995 분석과학 Vol.8 No.4
Three anode configurations of six-jet, cone-jet and cylindrical-jet are tested for their analytical performance under power mode operation. The effect of pressure, power and gas flow rate on atomic absorption signals have been studied. The increase of atomic absorption signal of sample element is observed at a fixed pressure in all configurations as the gas flow rate increase up to 300-600 seem, and as the power dissipated in the glow discharge cell increase. The lower the pressure is in the glow discharge cell at a fixed discharge power and argon flow rate, the greater the absorbance of sample element is. The optimum conditions are taken from these data and a calibration curve of Cu in low-alloy steel sample is obtained. In this calibration curve, six-jet configuration shows the best analytical results varies as the sample element.
중·고등부 태권도선수의 성취목표성향과 스포츠자신감 및 인지된경기력의 관계
설수황(Su Hwang Seol),여인성(In Sung Yeo),김범준(Beom Joon Kim) 한국체육교육학회 2013 한국체육교육학회지 Vol.18 No.3
본 연구는 우리나라 태권도의 미래를 책임질 중·고등부 태권도선수들의 성취목표성향과 스포츠자신감 및 인지된경기력간의 관계를 규명함으로써, 향후 우리나라 태권도선수들의 경기력향상에 유용한 정보를 제공하는데 궁극적인 목적을 두고 진행되었다. 본 연구목적을 달성하기 위하여 SPSS 18.0과 AMOS 18.0을 이용하여 빈도분석, 탐색적 요인분석, 확인적 요인분석, 신뢰도분석과 상관관계분석을 실시하였고 구조방정식모형(SEM)을 통하여 변인간의 인과적 관계를 규명하였다. 본 연구에서 도출된 결과는 다음과 같다. 첫째, 태권도선수의 성취목표성향은 스포츠자신감에 긍정적인 영향을 미치는 것으로 나타났다. 둘째, 태권도선수의 성취목표성향은 인지된경기력에 영향을 미치지 않는 것으로 나타났다. 셋째, 스포츠자신감은 인지된경기력에 긍정적인 영향을 미치는 것으로 나타났다. 넷째, 태권도선수의 성취목표성향과 인지된경기력의 관계에서 스포츠자신감은 매개하는 것으로 나타났다. This research intends to provide the basic data for the taekwondo major middle, high school student`s efficient and positive use of their practice time that is on increase. For this purpose, it examined the taekwondo major student`s achievement goal orientations, sports confidence and also studied their influence on the perceived performance. The subject of this study were taekwondo major students. The date were analyzed by frequency analysis, reliability analysis, exploratory factor analysis, confirmatory factor analysis, correlation analysis, structural equation modeling in accordance with the purpose of the study by using SPSS Version 18.0. and Amos 18.0 program. The results are as follows. First, achievement goal orientations had a significant influence on the sports confidence. Second, achievement goal orientations had no significant influence on the perceived performance. Third, sports confidence had a significant influence on the perceived performance. Fourth, sports confidence mediated the relationship between achievement goal orientations and the sports confidence.