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지성민,서용칠,구교진,현창택 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.2
In terms of the Safety, a risk of accident in construction industry is the most dangerous thing in any other industries. So, there have been many studies to improve the safety performance of construction projects. But, the most of them were dealt with controls in the job site and the contractor. For these reasons, the purpose of this study(Construction Safety Management) is two-part. : One is showing the basic items composed of prequalification in Construction Safety Management, and the other is improving the selection method to meet the owner's needs including a Contractor's Safety Management Performance.
신용승,이승호,서유원,정성교 서울産業大學校 1999 논문집 Vol.49 No.2
As developing the technology in industry, the materials with superior grade of stiffiness and lightness are required, and hence the higher fatigue strength characteristics are necessary. Thus, the non-traditional machining to increase fatigue strength is becoming influential as very important technology. Considering environmental problem, the shot peening process is selected as a good process to increase fatigue strength. But the data related to shot peening process are not enough in this country. Shot peening process is essential to ensure repeatability and uniformity on a part to part and lot to lot basis, while conforming to the applicable specifications. The shot material, size, shape and hardness as well as velocity and impact angle must be controlled to provide consistency in peening results. In order to effectively control the shot peening process, parameters must be addressed in the following order, such as media control, coverage control, intensity control, equipment control and so on.
전자상거래는 과연 상품가격을 낮추는가? : Online 상품과 Offline 상품의 가격비교
徐敏敎,安聖恩 경일대학교 2001 論文集 Vol.17 No.-
The purpose of this study is to investigate the proposition that e-commerce lowers the commodity prices, so that the online commodity prices are lower than those of offline commodities. We first study the proposition theoretically by employing microeconomic theories, and we also do some empirical researches. This study supports the proposition.
서신석,김동표,문교태,노재성 忠南大學校 産業技術硏究所 1997 산업기술연구논문집 Vol.12 No.1
Cordierite ceramic was prepared by sol-gel method. It was analyzed by Infrared spectroscopy and X-ray diffraction patterns that the ceramic was chemically mixed in molecular level and transformed to α-cordierite at 1250℃. Water vapour treatments for aging and drying process were conducted to get porous cordierite with thermally stable pore structure. It resulted in 220-410㎡/g BET surface area and mesoporous structure with mean pore diameter, 40Å. Compared to naturally dried ceramic, the ceramic showed superior thermal stability of surface area up to 700℃.
관상동맥 조영술을 시행한 환자에서 신동맥 협착의 유병율과 이에 연관된 위험인자 분석
유교상(Kyo Sang Yoo),강재영(Jae Young Kang),장재원(Jae Won Jang),서장원(Jang Won Seo),정영옥(Young Ok Jung),유혜승(He Sung Yoo),박성욱(Seong Wook Park),박승정(Seung Jung Park),박정식(Jung Sik Park) 대한내과학회 1998 대한내과학회지 Vol.54 No.3
Objectives: The distributive pattern of atherosclerotic vascular disease is known to be different among the races. In Caucasian population, renal artery stenosis (RAS) was reported to be a frequent finding in the patients with ischemic heart disease (IHD), ranging from 5% to 29%. We investigated the prevalence of RAS and the risk factors in Korean patients. Methods: Over a 12-month period, 574 patients (M:F, 407:167) with clinical ND underwent cardiac catheterization. Before the procedure, demographic data, medical history, physical findings, and blood chemistries were obtained. During the procedure, selective renal arteriogram was also obtained. The degree of renal artery stenosis was quantitated with automatic edge detection technique, and narrowing of diameter greater than 50% was considered to be significant. Results : RAS was identified in 42 patients (7%), of whom 5 patients (1%) had bilateral disease. Angiographically significant coronary artery disease was present in 473 patients. The prevalence of RAS in patients with single, double and triple vessel disease of coronary artery were 4% (9/235), 13% (20/154), and 12% (10/84), respectively, Among the 101 patients with normal coronary arteries, 3 (3%) had RAS. By univariate analysis, there was significant difference between RAS and non-HAS in age (66±8 yrs vs 59±10 yrs, p<0.0001), duration of hypertension (73±13 yrs vs 3.40.3 yrs, p=0.0002), and the frequency of double or triple ±coronary artery disease (p=0.004). However, no association was found between RAS and serum lipids, lipoprotein(a), creatinine, sex, smoking, diabetes mellitus, or peripheral vascular disease. By multivariate logistic regression analysis, the following parameters were independent risk factors for RAS: age over 65 years (p<0.001), duration of hypertension (p=0.003), and coronary artery disease involving double or triple vessels (p=0.004). Conclusion : The prevalence of RAS in Koreans is somewhat lower than in western population. However, in patients with high degree coronary heart disease, old age over 65 years, or long history of hypertension, the possibility of combined RAS should be considered.
한국의 대 EU 국가 해외직접투자 결정요인에 관한 연구
김성기(Seong-Ki Kim),서민교(Min-Kyo Seo),강한균(Han-Gyoun Kang) 한국관세학회 2011 관세학회지 Vol.12 No.2
The main research method for this study is to adopt the Vector Error Correction Model. The study proposes that explanatory variables are GNI per person in each EU country, consumer price index, population, real effective exchange rate, ICT investment, internet users per 100 persons and telecom line per 100 persons to each EU country. The findings of the study are as follows: The importance of technological capabilities, advertising intensity, and firm size at the parent at parent company level and learning effect at local subsidiary level foreign direct investment decisions. Korean large corporations’ investment strategies in EU are based on EU’s local markets unlike cheap factors of production in developing countries.