건설 예정의 Coil Center 운영에 대한 Simulation 분석

성덕현,윤원영,옥영석 釜山大學校生産技術硏究所 1997 生産技術硏究所論文集 Vol.52 No.-

본 논문은 건설예정인 coil center의 처리능력과 물류를 평가하기위한 시뮬레이션모델을 개발하는 연구이다. 경험적인 추정에 의한 야드에서의 수량, 저장시간의 분포를 구하고 3가지 운영대안이 제안되어 SLAMII를 이용한 시뮬레이션을 실시하며 최종적인 대안은 설비(Slitter)의 추가가 추천되어 이 것에 대한 시뮬레이션 결과를 분석한다. 그 결과 Slitter와 저장야드의 병목현상이 나타나므로 향후 이부분에 대한 기술적인 고려가 필요한 것으로 나타났다. In this paper, the simulation model is developed to evaluate the capacity and the material flow of the planned coil center. By the empirical estimation, the distributions of the quantity and the elapse time in the yard are obtained, and three alternatives are proposed. Based on the primitive simulation using SLAMII, the final alternative is prepared which includes one more facility (slitter), and the simulation is also performed. The result shows that the slitter and the storage yard are the bottleneck points throughout the slitting process. And the problem should be solved technically in managerial decision making related to construct the new coil center.

意思決定補助시스템의 效果的運用

崔德圓 成均館大學校 科學技術硏究所 1983 論文集 Vol.34 No.2

Several approaches toward the effective Operation of DSS have been identified thro(μ)gh the survey of literature. The intelligence phase of DSS is not dealt with in this paper since it is more related with data base activities. This paper provides an outline of current trends in the search of effectiveness in DSS. Robustness rather than optimality is stressed in the search for effectiveness.

고온가스냉각로(HTGR) 열전달 연구를 위한 상사실험 방법론 개발

문덕원,고상혁,정범진 제주대학교 공과대학 첨단기술연구소 2005 尖端技術硏究所論文集 Vol.16 No.2

Increasing interests on hydrogen, as a future alternative energy source, have led activities concerning the production, transportation, and use of hydrogen. As an activity to produce hydrogen using the nuclear heat, the development of HTGR(High Temperature Gas-cooled Reactor) are in progress. The gas phase coolant in the HTGR results in the coupling of buoyancy effect and increased radiation effect to most of heat transfer phenomena. In order to overcome those difficulties in the heat transfer study of gas phase coolant, an analogy experiment methodology was developed using analogy concept between heat transfer and mass transfer. The electroplating system with the limiting current technique is adopted to simulate heat transfer systems. Two typical heat transfer problems of Poiseuille flow and laminar and turbulent natural convections with well-known heat transfer correlations, were simulated. The test results show close agreements between heat transfer and mass transfer, which is encouraging indication of the validity of the analogy experiment methodology.

資産性 投資事業의 效果的 管理를 위한 經營情報시스템의 設計

崔德圓,崔相萬,洪永植 成均館大學校 1980 論文集 Vol.28 No.-

Most industries have several projects to undertake which fall into the category of capital investments. But the general tendency of their economic analysis has been confined to a project by project basis. This tendency made it very difficult to configurate overall possible impacts upon the value of a firm, and upon the future financial structure that may be produced from the performance of a certain set of selected project alternatives. This thesis attempts to resolve these shortcomings by adopting the concept of integrated management information system. For this purpose a data base schema was constructed to facilitate the systematic processing of capital investment information. From the cash flow information a desirable debt ratio (DDR) was determined to find the amount of debt that can be financed to each project under specified risk level. The DDR model, when applied with the 0-1 integer programming model, plays an important role in the selection of optimum project-mix that will keep the firm in healthy financial position throughout its planning horizon. Another important achievement from this study is that it was made possible to derive various kinds of expected financial ratios over the forthcoming time domain of top management's concern, while the conventional financial ratio analysis has been restricted to the past.

원자로 Stud Bolt 의 결함검출을 위한 초음파 신호처리 기법개발

오원덕,이준현,최상우,박문호,조윤호 한국비파괴검사학회 2004 학술대회 논문집 Vol.- No.-

Bolt failure is a hazard factor for the safety of reactor vessels in nuclear power plants. However, in the practical application of ultrasonic technique for crack detection in stud bolt, the classification of crack signal from the signals reflected from threads in stud bolt is very difficult. In this study, shadow effect technique combined with new signal processing method has been investigated to enhance the detectability of small crack initiated from root of thread in stud bolt. The key idea of new signal processing concept is based on the fact that the shape of waveforms from the threads is uniform since the shape of the threads in a bolt is same. If some cracks exist in the thread, the flaw signals are different from the reference signals. It has shown that the small flaws can be effectively detected by novel ultrasonic technique combined with this new signal processing concept.

임피던스 방법을 이용한 뇌혈류량 측정기기의 개발(Ⅰ)

김덕원,김정래,송철규,김정열,남문현 대한의용생체공학회 1989 의공학회지 Vol.10 No.1

In this study, Rheoencephalography(REG) was designed and constructed. Using the constructed instrument cerebral blood flow(CBF) of left and right brain, CBF change by posture, and reproducibility were studied. Followings are important results. Relative CBF could be measured noninvasively and continuously. Since reproducibility of the constructed REG was found to be quite high (4 %), the accuracy of the instrument itself was proved. REG can be easily applied for testing the effect of drugs for the patients with cerebral vessel diseases since it is quite sensitive to the relative changes of CBF. Various cerebral diseases can be diagnosed by analyzing the REG waveforms. The area of restricted cerebral blood vessels can be located by arranging the electrode configuration. Comparative studies with the standard techniques of measuring CBF are needed to verify the accuracy of REG. Further studies on optimal electrode configuration and various artifacts are also necessary.

지식공간론에 기초한 학습경로 탐색 알고리즘 연구

변두원,박달원,이덕호 공주대학교 과학교육연구소 2002 과학교육연구 Vol.33 No.-

일반적으로 어떤 학습주제에 대한 학습경로의 선택은 학습내용에 의존하므로, 교과내용 전문가가 내용을 분석하여 학습경로를 결정한다. 이러한 학습경로의 결정 과정을 컴퓨터시스템에 구현하는 것은 매우 어려운 문제이다. 그러므로 이것을 극복하기 위하여 자료의 처리과정을 기호화하여 한다. 본 논문에서는 평가결과로부터 얻어지는 학생들이 맞힌 문항만을 이용하여 학습경로를 결정하는 방법을 제시한다. 연구 방법은 지식공간론의 연구결과를 교육평가의 관점에서 재해석하는 것이다. Generally, the choice of the learning path for a subject depends on contents near to it, and a decision of the learning path is made by an expert. It is difficult to realize such a decision in the computer system. Hence, we must symbolize the course of obtaining the learning path. In this paper, we obtain an algorithm of searching the learning path from only the collection of questions that a students is capable of solving. Our method is again to interpretate some results of the knowledge space theory in the view of educational evaluation.

운동훈련이 흰쥐 노화심근에 미치는 영향 : I. 장기간 지구력 운동 훈련 I. Long Term Endurance Exercise

이용덕,이상선,박원학 THE KOREAN SOCIETY FOR BIOMEDICAL LABORATORY SCIEN 1996 Journal of biomedical laboratory sciences Vol.2 No.1

장기간 반복 주행운동이 흰쥐의 심근에 미치는 효과를 규명하기 위하여 생후 3개월, 10개월 및 20개월된 흰쥐를 운동군과 대조군으로 대별하여 motor driven treadmill을 이용하여 Park등이 사용한 방법에 준해서 5개월간, 주 5일 20분간 운동을 시킨 후 심근의 조직 및 세포학적 변화를 관찰하고 심근 세포 내 미세구조 변화를 입체해석학적으로 비교 분석하였다. 연령 증가에 따라 장기간 반복운동이 흰쥐 심근 미세구조에 미치는 영향은 8, 15개월의 운동군과 대조군 사이에 뚜렷한 차이를 인정할 수 없으며, 15개월의 운동군에서 대조군에 비하여 변성된 사립체, 리소조옴, 지방적, 공포, 노화색소 등이 증가하는 경향이 있었다. 25개월 운동군은 같은 연령 대조군에 비하여 근원섬유 수축대, 근원섬유 소실, 윤반분리, 세포간질 증식, 핵의 변성, 교원섬유 근섬유내 침입 등 매우 심한 변화를 보였다. 조직상에 나타나는 early lipofusin과 미세구조상에 나타나는 노화색소는 8, 15개월의 운동군과 대조군 사이에 유의한 차이는 없었으며, 25개월 운동군은 같은 연령 대조군에 비하여 유의한 차이로 증가하였다. Glucose-6-phosphatase 활성도 8, 15개월군에서 운동군과 대조군에서 모두 활성이 높았으며 25개월의 대조군과 운동군에서는 모두 활성이 거의 나타나지 않았다. 미세구조 변화를 입체해석학적으로 분석한 결과 8,15개월의 대조군과 운동군에서 체적 밀도의 모든 항은 양군사이에 유의한 차이가 없었다. 25개월에서는 세포간질이 대조군에 비하여 운동군이 유의한 증가를 나타내었고, 근원섬유는 유의한 차이는 없지만 증가하는 경향을 보였으며, 사립체는 대조군에 비하여 유의한 감소를 나타내었고 근형질세망의 체적밀도는 감소하는 경향을 보였다. 사립체와 근원섬유 비는 8개월 운동군에서 유의한 차이는 없지만 대조군에 비하여 높게 나타났으며, 15개월의 운동군과 대조군 사이에서는 차이를 인정할 수 없었다. 그러나 25개월 운동군은 대조군에 비하여 유의한 차이로 감소하였다. 연령증가에 따른 사립체 내막 표면밀도와 사립체수는 대조군과 운동군 사이에는 유의한 변화는 없었다. 본 연구의 성적을 검토한 결과 젊은층(3개월군)과 중령층(10개월군)의 흰쥐에서는 반복된 지구력 운동이 심장에 미치는 역효과를 인정할 수 없었으며 젊은층의 흰쥐에서는 오히려 심장기능 강화를 보이는 경향이 나타났으며, 노화층(20개월군)에서 운동군에서는 스트레스로 작용하여 심장기능의 저하를 초래 하였다고 생각된다. There is considerable current interest in the effect of regular vigorous exercise and in particular endurance-running as a possible measure in improving myocardial function. Some data indicate that the aging heart may actually suffer from vigorous endurance exercise. On the contrary, appropriate exercise in aged animals improves myocardial function and aerobic energy metabolism. So far there is relatively little data to indicate that endurance exercise is in fact beneficial in improving myocardial function or damaging to heart of aged animals. The present investigation aimed to study the possible effect of a long range treadmill training program on the heart in aging rats. Male rats aged 3, 10, and 20 months were divided at random into a control (sedentary) and an exercise group. The training group was exercised for 5 days a week on an automated treadmill for 20minutes at 18m/min over a period of 5 months. The exercise regimen of our experiments did not cause any significant changes in the tissues and ultrastructural as compared with sedentary age-matched control. Tissues and ultrastructures of myocardial cells in trained group aged 8 months are intact and well organized as well as sedentary control group. Age associated tissue and ultrastructural changes of trained group aged 15 months included : an increase in transformed mitochondria, vacuoles, lysosomes, lipid droplets and early lipofuscin. But the trained heart did not show significant difference in tissue and ultrastructural properties from those of sedentary controls. Endurance-trained group aged 25 months showed significant qualitative tissue and ultrastructural difference as compared with age-matched controls. In addition to those found in 25 months control group, focal necrosis, myofibril fraying, hypercontraction band, seperation of intercalated discs, degenerating nucleus and infiltration of collagenous fiber into myocyte were noted in trained 25 months group. The stereological examination of the micrographs disclosed no significant difference in the myofibril, mitochondrion, sarcotubule and interstitium volume density and surface density of mitochondrial cristae and numerical density of mitochondria between trained and control group aged 8 and 15 months. In the trained 25 months group, significant increase in volume density of interstitium, lipofucsin granule were shown as compared to untrained agematched control. On the other hand, significant decrease in mitochondrion volume density was shown. The myofibril volume density did not differ between trained and control group although trained group showed slight increase. From the data obtained, a reduced mitochondria/myofibrils ratio was found in trained rat heart aged 25 months and there was no difference between trained and control rat aged 15 months. But a slight but not significant increase was found in the trained group aged 8 months as compared with same age control group. Such increase in the ratio in young animals is considered to be of great importance to cardiac pumping and adaptability. Whereas such adaptations don't seem to occur in aged heart muscle. This study proposed that repeated endurance exercise do not cause any significant qualitative and quantitative ultrastructural change of heart muscle in young(3months) and adult(10months) suggesting that the heart is able to adapt to the exercise. On the contrary, the repeated endurance exercise stress may actually induce degenerative changes in the aged heart muscle(20months).

童蒙先習의 敎育課程論的 考察

朴德元 부산외국어대학 1983 논문집 Vol.1 No.-

Dongmongseonsub was the first one of the textbooks which have been written by korean scholars. Park, Sae-moo, the author of this book, was the county headman at MaJeon in 1541 and at that tie he wrote it to teach the primary school children the basic moral. We need to examine this textbook in the viewpoint of modern curricular theory and we could come to the conclusion that sums up as follow. (1) The aims of education in Dongmongseonsub was to make the children understand the five cardinal articles of morality and practice them strictly in every day life. (2)The structure of the contents is composed of two units which one is the five cardinal articles of morality and the other is general remarks in which contains the history of Korea and China. (3)The order and the way of arrangement o the content in each article is very formal and regular; in the first place is laid the sum and substance of concept about the article, in the second place the way of practice, it, thirdly the significant other whom we can be eager to imitate, and finally a sage's teaching. (4)The process off learning is belong to the method of a mastery learning kind and there are five stages in it as follow terms; ①recitation (a brief oral test of previous day's learning) ② presentation ③ study ④ understanding ⑤ perusal. And we can find they are similar to the morrison's five stage; ① exploration ② presentation ③assimilation ④ organization ⑤ recitation (5)It is the main weak point of this book that throughout this book the author not only described China as if she were a suzerain state of our nation but also he wrote down a little about our own culture, and that the content is too difficult for the primary school children to learn it effectively.

朱震亨의 中風論에 관한 考察

고경덕,이동원,정승현,신길조,이원철 동국대학교 한의학연구소 1997 東國韓醫學硏究所論文集 Vol.6 No.1

朱震亨은 金元四大家중 가장 후대의 인물로서 朱子學의 철학적 배경에 근거하여 劉河間, 張子和, 李??의 장점을 흡수하여 醫論을 펼쳤으므로, 金元四大家의 中風 內因論을 인식하는데 있어 그 의미가 크다. 朱震亨 中風論의 특징은 그가 거처한 純域的 特性에 근거하여 肥瘦人과 半身不遂의 左右에 따라 각각 治法을 달리하였으나, 中風 病因病理를 濕痰生熱로 보고 內因의 주요소로 痰을 중시하여 中風入方藥物은 治痰한다는 원칙에 기준하여 藥物을 사용하였다. 이러한 독특한 中風論은 후대 中風 內因論의 발전에 지대한 영향을 주었으므로, 이에 관한 연구는 中風 內因論 측면에서 韓醫學發展에 寄與할 것으로 恩慮된다. We inquired into the origins, pathologies, theraphies and prescriptions of Jungpung(中風) especially on the ground of Keokchiyeron(格致餘論)ㆍDangeosimbub(丹溪心法) written by JuJinHyoung(朱震亨) as modical blocks, from this study we could get that conclusions. 1. According to special feature of the theroies of JuJinHyoung's(朱震亨) Jungpung(中風) he thought pathologies of Jungpung(中風) as 「sub seong dam dam seong yeol yeol seong puns 濕疾痰痰生熱 熱生_風」through studying stress on regional characteristics and thought much of dam(疲) as one of major elements of internal causes. 2. He suggested chi-dam(治痰) in the first place in the treatment of Jungpung(中風) and emphasises the treatment using Succus Pyllostachyos(竹瀝), waterly extracted Rhizoma Zingiberis(鐘汁) in that they had the virtues of sodam-ganghwa(消痰降火), geo-gyeongrak(開經絡), haeng-heolgi(行血氣). 3. He treated differently whether a man in fat and thin, and have right or left hemiplegia, but he prescribed herb-medications on the principle that medications should have the virtues of chi-dam(治痰).