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入力電流의 高調波 低減을 위한 새로운 다이리스터 整流回路의 개발
柳喆魯,金聖中,李公熙,李星龍,高榮浩 全北大學校 1987 論文集 Vol.29 No.-
The harmonics involved in input AC line currents of thyristor rectifier apparatus have recently been a serious problem in the cause of burning power condenser, mis-action of UFR(protective relay), and trouble of the automatic voltage controller, etc, in the sending or distribution electric power system. As an effective counter-measure for this, the method of having switching taps on the conventional interphase reactor and its artificial utilization have been adapted, as we know. The conventional 3 tap method, however, is not achieved an effect of reducing harmonics under firing angle 15˚. In this paper, a new method of reducing harmonics involved in input AC line currents or output DC voltage of rectifier circuit is presented, which is due mainly to the equipment of the 2-3 switching taps on interphase reactor. Thereofre, main contents of this study are the following three items; 1) optimal number of taps 2) optimal turn ratio of interphase reactor 3) optimal control angle of interphase reactor.
이철희,이용인,김기중 충남대학교 자연과학연구소 1980 學術硏究誌 Vol.7 No.2
The purpose of this study was to observe the effects of the exercise of flextion and extention on the improvement of physical constitution. The authors examined the physical condition of the following athletes registered on the Korean amateur sports association. Flextion exercise athletes. Velleyball (69 men, 77 women). Basketball (58 men, 56 women): Table tennis (60 men. 69 women): Baseball (107 men): Soccer (113 men): Handball (41 men): Rugby Football (68 men): Hockey (40 men): Tennis (18 men). Athletics (70 men); Tae Kwon Do (220 men) Extension exercise athletes Wrestling (16 men): Judo (72 men). Ssi reum (S5 men). The results were as follows. 1. The body weight ratio of flection athletes (42.7 % ) was higher than that of extention athletes (38.0%) 2. The nutrition rate of flection athletes (915.7%) was higher than that of extention athletes (828.1%). 3. The Kaup's index of flection athletes (2.48%) was higher than that of extention athletes (2.16%) Between the body weight and broca's standard weight, the extention athletes group showed greater differences than those of the flection athletes group
백서 창상의 피복방법에 따르는 Muofibroblast의 생성 및 소실되는 과정의 실험적인 비교관찰
김한중,최희윤,조철현,이인승 大韓成形外科學會 1985 Archives of Plastic Surgery Vol.12 No.1
The question of how skin coverage affects contracting wounds has long been a significant problem in the study of wound contraction. Myofibroblasts appear to be well established as the cellular cause of wound contraction. Myofibroblasts are found in many types of contracting wounds, including granulating wounds and hypertrophic burn scars. Myofibroblasts in contracting wounds have definitive life cycles, being present when contraction is active and then disappearing when contraction has ceased. In this study, we observated comparatively quantitative changes in the surface area by planimetry and changes of myofibroblasts by electron microscope through 8 weeks according to the types of skin coverage. The purpose of this study was to evaluate the myofibroblast population in skin coveraged wounds in a rat model, which allowed frequent biopsies as well as precise identificaion of the interface of the skin coverage and the wound bed. The results of our experiments are as follows: 1. Granulating wound Contracted rapidly and had long persistence of myofibroblasts. 2. Split-thickness skin graft Contrated less and myofibroblasts were more rapidly decreased and were disappeared at 5 weeks later. 3. Full-thickness skin graft Minimum contracti aondnmyofibroblasts were very rapidly decreased and were disappeared at 4 weeks later. 4. Local flap No contraction and could not find myofibroblast. Slowly increase in size at begining. 5. Contraction was influenced by number and lasting time of myofibroblast.
윤화중,진성일,윤민중,윤혜수,이영하,최철규,이천배,신대현 충남대학교 자연과학연구소 1986 忠南科學硏究誌 Vol.13 No.2
Chungnam National University (CNU) is located in Daeduk Science Town, a center of science and technology in Korea, and it is expected to play an important role in the development of science in Korea. With this in mind, the basic natural sciences at CNU should be more actively supported in both education and research. Accordingly analysis and comparison of the basic science program at major college in Korea as well as those in the USA and Europe has been performed. The current cooperative relationship between CNU and research institutes in the science town has also been analyzed. This study has resulted in propositions to make more efficient the upbringing of the basic sciences at CNU, by focusing on the following points ; a) to improve academic affairs, b) to make graduate studies substantial, c) to secure highly qualified faculty members, d) to increase cooperation in research between CNU and reserch institutes, e) to enlarge research laboratories and acquire more equipment and facilities.
김범철,박주현,허우명,임병진,황길순,최광순,최종수 江原大學校 附設 環境硏究所 2001 環境硏究 Vol.18 No.-
In this study limnological characteristics of Lake Juam was surveyed from June 1993 to May 1994 in order to provides important information regarding water resources. Seschi disc transparency, epilimnetic chlorophyll a(chl-a), tatal nitrogen(TN), total phosphorus(TP) concentration and primary productivity were in the range of 2.0~4.5 m, 0.9~13.6 mgChl/㎥, 0.78~2.32N/l, 11~56 mgP/㎥, 270~2,160mgCm^(-2)day^(-1), respectively. On the basis of TP, Chl-a and Secchi disc depth, the trophic state of Lake Juam can be classified as mesotrophic lake. The phosphorus inputs from non-point sources are concentrated in heavy rain episodes during the monsoon season. As a result, phosphorus concentration are higher in summer than in winter. TP loading from the watershed were estimated to be 0.9 gPm^(-2)yr(-1), which correspond to a boundary of the critical loading (1.0 gPm^(-2)yr(-1), which correspond to a boundary of the critical loading (1.0 gPm^(-2)yr(-1)) for eutrophication. From the results of the algal assay, both phosphous and nitrogen act as limiting nutrients in algal growth. The seasonal succession of phytoplankton community structure in Lake Juam was similar to that observed in other temperate lakes. Diatoms(Asterionella formosa and Aulacoseira granulata var. angustissima) were dominant in spring and winter, cyanobacteria (Microcystis aeruginosa, M. sp. and M. viridis) were dominant in warm season. The organic carbon, nitrogen and phosphorus content of lake sediment were 9.5~14.0 mgC/g, 1.01~1.82 mgN/g, and 0.51~0.65 mgP/g, respectively. The allochthonous organic carbon loading from the watershed and autochthonous organic carbon loading by primary production of phytoplankton were determined to be 1,122 tC/yr and 6,718 tC/yr, respectively. To prevent eutrophication of Lake Juam, nutrient management of watershed should be focus on reduction of fertilizer application, proper treatment of manure, and conservation of topsoil as well as point source.
김희철,김중환 한국외국어대학교 외국학종합연구센터 부설 기초과학연구소 1996 기초과학연구 Vol.4 No.-
본 논문에서는 가스망을 나타내는 방향그래프에서 말단의 사용자들의 가스 사용량이 주어져 있을 경우 다른 모든 정점들(정압기)을 흐르는 가스량을 구하는 문제를 고려하여 이를 규명하고 또한 주어진 가스망에서 사용자들의 가스 사용량이 주어져 있을 경우 다른 모든 정점들에 흐르는 가스량을 구하기 위한 최소수의 감지기(sensor)를 어느 가스관에 부착해야 하는지를 결정하는 알고리즘을 제시하였다. 그리고 위의 문제에서 source가 여러 개일 경우 이들 source들에서 나가는 가스량과 말단의 사용자들의 가스 사용량을 알고 있는 가정 하에 위의 문제를 다시 고려하여 이를 규명하였다. 그리고 감지기들이 부착된 가스망과 source들과 사용자들의 가스량에 대하여 나머지 모든 정점들의 흐름량을 구하는 알고리즘을 제시하였다. In this paper, we consider digraphs representing gas-networks in which gas quantity of end users is given. The problem of determining gas-flow of all the vertices is characterized. Given a gas-network, we present an algorithm of finding the minimum number of sensors which are attached to edges to determine gas-flow of all the vertices. Next we consider the problem to which the following assumptions are added: multiple sources exist and flow of each source is known. This problem is also characterized. Finally given a gas-network in which sensors are attached, we present an algorithm of determining gas-flow of all the vertices.