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李熙泰 울산대학교 1977 연구논문집 Vol.8 No.1
事故없이 水泳을 즐기며 健康도 增進시키려면 泳法을 배워야 하겠다는 動機附與와 水泳에 關한 理論的 背景을 論하고 初心者 水泳指導는 우선 물에 親熟할 수 있게 물에 適應시키는 課程을 거친후 뜨기, 미끄러져 나아가기등 基礎技術을 익히고 팔, 다리, 호흡의 各個 및 複合動作을 熟達시키는 段階別 指導가 보다 效果的이라 主張하고 끝으로 水泳時 지켜야 할 留意事項을 記錄하였다. In the present report the wirter emphasizes the necessity of a well-organized swimming course in order to make the trainess safe in water and enjoy swimming properly. He also surveyed various suggestions and theories on swimming. The first step of swimming course for the beginners should be focused on making the trainees familiar and adapted to water. After this they may learn how to float, to dash forward, and other basic technique. The movementm of arms and legs and breathing are suggested to be trained in two separate steps-first separatel, then in unison. In the last part the present writer enumerated a number of cautions to be kept in mind before swimming.
냉간 정수압 성형시 금속분말과 맨드렐 사이의 마찰이 분말의 치밀화에 미치는 영향
이희태,김기태,Lee, Hui-Tae,Kim, Ki-Tae 대한기계학회 1997 大韓機械學會論文集A Vol.21 No.7
The effects of friction between powder and a mandrel on densification behavior of metal powder were investigated under cold isostatic pressing. The elastoplastic constitutive equations based on the yield function of Shima and Oyane were implemented into finite element program (ABAQUS) to simulate compaction responses of metal powders during cold isostatic pressing. The friction coefficients between powder and mandrels with different roughness were determined by comparing experimental data and finite element results. Density distributions in the powder compacts were also studied for different friction coefficients. Finite element results were compared with experimental data for pure iron powder under cold isostatic pressing.
이희태,김희연,박현진,조영은,유소영,이경진,정종선,고광표,Lee, Hee-Tae,Kim, Hee-Yeon,Park, Hyun-Jin,Cho, Young-Eun,Ryu, So-Young,Lee, Kyung-Jin,Jung, Jong-Sun,Ko, Gwang-Pyo 한국환경보건학회 2008 한국환경보건학회지 Vol.34 No.1
Lake Shiwha, an artificial lake located near metropolitan Seoul, offers a unique water environment and has been suspected to have high levels of chemical and microbiological contaminations. Lake Shiwha was originally connected to the sea but currently has four major surface water inputs from agricultural, municipal, industrial areas and in addition an occasional inflow from the sea. The objectives of this study are to investigate the relative contribution of microbial contaminants from each of the inflowing surface waters and to identify appropriate microbial indicator organisms in this unique water environment. We measured the levels of microbial contaminations in the four inflowing surface waters. A number of microbial indicator organisms including total coliform (TC), fecal coliform (FC), E. coli, Enterococci, somatic and male-specific coliphages were analyzed. Bacterial indicator microorganisms were detected and quantified by the $Colilert^{(R)},\;Enterolert^{(R)}$ kit. Surface water (50 l) was sampled by $ViroCap^{TM}\;5"$ cartridge filters and analyzed by the single agar layer method for detecting coliphages. The concentrations of TC, FC, E. coli, and Enterococci were 1543 CFU/100 ml${\sim}1.99{\times}10^6$ CFU/100 ml, 0 CFU/100 ml${\sim}202$ CFU/100ml, 0 CFU/100 ml${\sim}1.80{\sim}10^5$ CFU/100ml, 74 CFU/100 ml${\sim}3408$ CFU/100 ml, respectively. The male-specific and somatic coliphages were detected in three different inflowing surface waters. Isolated E. coli and Enterococci strains were further analyzed by 16s rDNA amplification and subsequent phylogenetic analysis from Jungwang-chun, Ansan-chun, Banwol-chun and penstock of inflowing surface water. Our results indicated that the concentrations of different fecal indicator microorganisms might not be highly correlated with each other. Multiple microbial indicator organisms should be used for monitoring microbial contamination and microbial source tracking methods.