원자로압력용기장 용접열영향부의 미세조직 변화가 Magnetic Barkhausen Noise 거동에 미치는 영향

김주학,윤의박,문종걸,박덕근,홍준화 韓國非破壞檢査學會 1998 한국비파괴검사학회지 Vol.18 No.4

최근 자기적 특성의 변화가 재료의 미세조직적 상태에 민감하다는 보고가 있다. 재료의 미세조직은 상(phase), 결정립의 크기, 석출물 등의 다양한 인자로 구성되며, 본 연구에서는 이러한 인자들을 이용하여 재료의 특성과 Barkhausen noise(BN)의 관계를 연관시키기 위한 시도를 하였다. ASTM A 508 Gr.3 원자로압력용기강을 대상으로 용접열영향부의 미세조직적인 변화를 일곱가지 대표적인 영역으로 구분하였고, 각 영역에서의 미세조직과 기계적특성의 변화를 파악한 후, 각 조건별로 BN을 측정하였다. 통상의 보자력이나 잔류자화 같은 자기적 성질은 큰 변화가 없었지만, BN은 미세조직의 상태에 따라 현격한 변화를 보였다. 결정립과 석출물의 크기가 증가함에 따라 BN은 증가하였고, tempered martensite 보다는 tempered bainite 조직에서 높은 BN을 나타냈다. Recent study has demonstrated that some magnetic properties are sensitive to the microstructural state of material. The ASTM A 508 Gr. 3 reactor pressure vessel steel has various microstructural changes including martensitic and bainitic phases, and various sizes of grain and precipitates in the weld heat-affected zone (HAZ). To correlate the microstructural state with Barkhausen noise (BN), specimens were prepared through simulating various weld thermal cycles using a thermal simulator. The conventional magnetic properties, i.e. coercive force, remanence and maximum induction, did not change significantly. whereas the BN amplitude and energy during a magnetization cycle changed markedly with microstructural state. The BN increased with increasing grain and carbide sizes, and the tempered bainite structure showed higher BN parameter than tempered martensite.

日本傳統空間美學이 日本現代室內디자인에 미친 影響에 관한 硏究

김문덕 건국대학교 조형연구소 1995 조형연구 Vol.3 No.-

This research is to explain the influence of Japanese traditional aesthetics and space concepts to Japanese contemporary interior design. Also, this paper illustrates the methods that applied. This is clearly stated in the speech by John Naisbitt “Think locally, Act globally.” By studing the Japanese traditional aesthetics and characteristics of space concepts we can enhance the contemporary Korean design by introducing the traditional Korean Aesthetics. Works of famous interior designer has been reviewed and analyzed. That is analysis of traditional aesthetics which can be seen in WABI, SABI or SUKI: influence of Japanese traditional architecture internal and external space concept to Japanese contemporary interior design. This study is believed to help the modernization of traditionality in Korean contemporary interior design.

네델란드 근대건축이 현대건축에 미친 영향에 관한 연구

김문덕 건국대학교 조형연구소 2001 조형연구 Vol.9 No.-

In this research, we will review the development processes and contents of several schools including : the Amsterdam School that is the modern Dutch expressionism and the mainstream of modem Dutch architecture: the De Stijl School that is referred as the essence of modern architecture that exhibits aesthetics of horizontality, perpendicularity and asymmetry; and the Deft School that is close to the Dutch Functionalism arid Eclecticism that have shown a mode of mechanical aesthetics. Another objective is to understand how these trends are connected to contemporary architecture. For the purposes, we have visited 12 cities in the Netherlands, along with performing literature review. Not to mention on Duch architecture, the De Stijl School of the perpendicularity and horizontality aesthetics or of asymmetric composition had influenced on Maki Fumihiko's TEPIA building and Aida Takefumi's series of Toy Block Houses in Japan, on the Peter Eisenman's collective houses from the U.S. exhibited at Berlin IBN Architecture Show, and on Koizumi Lighting Theater called IZM in Tokyo, Japan, Hejduk's series of diamond houses, as well as on the intense color of Esprit Store designed by Ettore Sottsass, an Italian interior designer and architect. The effects of the Amsterdam School, which is highly of the organic expressionism, is found at gigantic projects such as ING Bank in Amsterdam and GASUNIE headquarters in Groningen that are by Max van Huut W Ton Alberts working in the Netherlands. The Dutch Functionalism indirectly affected high-tech architecture such as Ponpidou Center in Paris as well as Schiphol Amsterdam Airport Terminal West by Benthem Crouwel in the Netherlands. In these ways, modern Dutch architecture has exerted an influence on the domestic and global contemporary architecture.

시스템 다이내믹스를 이용한 간호단위별 간호인력 산정에 관한 연구

김문실,성영희,권경자,김도형,김정아,신덕신,유인자,유재국,이현숙 병원간호사회 2006 임상간호연구 Vol.11 No.2

Purpose: The purpose of the study was to forecast manpower by building the nursing manpower-staffing model(surgical-medical nursing unite). Method: The system dynamics approach was adapted to build a simulation model for calculating medical-surgical nursing manpower-staffing. The model was built up on Venism 5.0b DSS. Result: The results in the basic circumstance are in following. The level of nursing service quality, patientsatisfaction, and nurse job satisfaction maintains higher at medical-surgical nursing unit of the tertiary hospitals with the ratio of bed to nurse 2.5:1-3.0:1 than at any other situations. The level of nursing service quality, patient satisfaction, and nurse job satisfaction maintains higher at madical nursing unit of the secontary hospotals with the ratio of bed to nurse 3.0:1 and at surgical nursing unit of the secondary hospitals with the ratio of bed to nurse 3.0:1-3.5:1 than at any other situations in the fundamental from. The results in the simulation circumstance are in following, As author raises the operating rate of bed into 95-100%, and cut skilled nursing staff down, the level of nursing-service quality, patient satisfaction, and nurse job satisfaction drops slightly. Conclusion: In terms of economic efficiency on tertiary hospotals, the ratio of bed to nurse for the best reasonable medical-surgical nursing manpower-staffing is 3.0:1. In terms of economic efficiency on secondary hospitals, the ratio of bed to nurse for the best reasonable medical nursing manpower-staffing is 3.0:1 and surgical nursing manpower-staffing is 3.5:1

TMCP 강재를 사용한 용접 H형강 보-기둥의 특성에 관한 연구

문태섭,김규석,김동규,김덕재 서울市立大學校 1993 論文集 Vol.27 No.-

This paper is the experimental study on the behavior of welded H-shape beam-column using TMCP steel. The purpose of this paper is to evaluate the elasto-plastic behavior of TMCP steel as it applies beam-column members. In the test, H-188 ×188 ×30 ×30 shape beam-column was loaded monotonic and cyclic by parameter "e"(eccentricity). The structural behavior of specimen under the eccentric loading have been evaluated by moment-curvature relationship and load-deflection relationship. Their load carrying capacities from the result of the test are compared with the theoretical load capacities based on P-M interaction curve.

변형률 측정을 이용한 추진기관용 Al 합금의 파괴인성 평가

김재훈,김덕회,임동규,박성욱,문순일 한국산업안전학회 2002 한국안전학회지 Vol.17 No.3

The fracture toughness is evaluated by using CT(compact tension) and 3PB(thress point bending) specimens of A1 alloys for propulsive engine. To evaluate the static fracture toughness, strain gage method is used. The static fracture toughness obtained from the strain measurement is compared with the results by ASTM standard and FEM analysis. For the reliable evaluation of fracture toughness, strain gages are attached at various positions.

실내공간에 있어서 색체계적 접근방법에 관한 연구

김문덕 건국대학교 조형연구소 1999 조형연구 Vol.7 No.-

It is not too much to say that the environment in which a human being lives is consisted of color and he lives in the middle of color. I, a researcher of this thesis, think it is important to prepare systematic color plan and to apply it to interior space which is very close to a human being's living because color is essential element to consist the created environment which is related to safety, health, and survival of a human being. Therefore, I prepared theory and standard of color plan to interior space based on the deveoped project which was focused on public area in interior space of a dormitory. I explained the importance and the need of color plan in interior space and discussed purpose and method of this study on chapter 1. introduction part. And, I debated about the meaning, characteristics and development method of color plan in interior space on Chapter 2. Also, I explained the theoretical background which especially was focused on NCS(Natural Color System) and approach to color plan of interior space on Chapter 3. On Chapter 5, I did show the development of plan which was focused on color plan of interior space for the dormitory of K university applying theory which I mentioned above to it. In addition, I explained how I interpreted functional and structural characteristics of the space under the plan and intended to prepare theoretical basis in my own way for further color plan through this process. I concluded what the desirable way in order to progress the study which combined thoery with practical matter in color plan which would fulfil in future.

흡입관에 부착된 디퓨저 효과에 대한 연구

김도태,이행남,박길문,이덕구,설재림 朝鮮大學校 機械技術硏究所 2004 機械技術硏究 Vol.7 No.1

The diffuser is used to get low pressure, and it has been applied to a lot of industry field like the heat engine, the fluid instrument power plant, the food industry, environment industry etc... because there are not any problem even it is mixed with kinds of liquid, gas, and solid. The flow characteristics in diffuser are investigated by prv and CFD. The experiment using PIV measurement for mixing pipe's flow characteristics acquired velocity distribution, .Condition : when mixing pipe's diameter ratio is 1:2.3, and the flux is Q₁ = 1.136 l/s, Q₂ = 1.706 l/s, Q₃ = 2.276 l/s . Based on the PIV and the CFD results, the flow characteristics in ejector are discussed, and it shows the validity of this study.

토끼의 Aflatoxin B₁중독증에 대한 인삼엑기스의 효과 : 임상, 생리적 및 병리학적 변화 Clinical, Physiological and Pathological Changes

김차용,변유성,문평일,정덕화,김종수 慶尙大學校 1987 論文集 Vol.26 No.1

Chinchilla 계통 1~1.5㎏ 되는 토끼 30마리를 5군 으로 나누어 체중㎏당 제 1군은 대조군으로서 Cornoil 0.3ml 씩 제 2군은 aflatoxin B? 0.03mg과 인삼 엑기스 8mg을 제 5군은 aflatoxin B? 0.06mg과 인삼엑기스 8mg을 3주동안 카테타로 경구 투여하여 임상, 혈액학적 및 병리학적 변화를 관찰하였다. 1.사료소비량 감소, 침울, 쇠약, 혼수, 체중증가율감소등과 같은 임상증상은 대조군을 제외한 전 처리군에서 독을 투여후 3일째 부터 전처리기간을 통하여 나타났으나 aflatoxin B? 단독처리군에서 인삼엑기스 혼합처리군보다 더 현저하게 나타났다. 2. 혈청 효소와 AST, ALT는 독물투여후 7일부터 인삼엑기스 혼합투여군 보다 aflatoxin B? 단독 투여군에서 높게 증가하였다. 3.전처리군에서 적혈수용적, 헤모글로빈농도는 영향을 받지 않았고, 혈장단백질은ㅇ 독물투여후 14일이후 aflatoxin B?단독 처리군에서 현저하게 감소하였다. 4. Aflatoxin B?과 인삼엑기스 혼합 투여군 보다 aflatoxin B? 단독투여군에서 간장의 공포변성,담관증생, 핵농축, 붕괴, hepatic fibrosis와 임파절 및 비장에서 현저한 임파양 세포의 소실을 나타내었다. The present study has been carried out to investigate the effectsof ginseng extract on induced chronic aflatoxicosis in rabits. Groups of rabbits were treated orally with aflatoxin B? and mixture of ginseng extract for 21 days with a dosage of 0.03mg, 0.06mg of the toxin and 0.03mg or o.o6mg of the toxin mixture of 8mg of ginseng extract or 0.3ml corn oil s place to per kg body weight. The results obtained were is follows. 1. Sings o toxicosis included reduction of feed consumption emaciation, decrese of body weight and coma revealed in both groups treated with 0.03mg pr 0.06,mg of aflatoxin B?/Kg/B.W than groups 4.5 after days 3. 2. In groups 2, 3(aflatoxin B? 0.03, 0.06mg), Activity of asparate aminotransferase(AST) and alanine aminotransferase (ALT)were increased sigificantly in dats7, 14 and 21. 3. In all groups, Mean values for packed cell volume(PCV)and hemogobin were unremarkasble, but plasma total protein were decreased in groups 2,3than 4,5 groups on days 14 and 21. 4. The rabits treated with aflatoxin B?(2,3 groups)showed markedly degenerative chasnges ranging from swelling and decreaseed granularity to marked vacuolation, hepatic necrosis, fibrosis and bile duct, Proliferation and depletion of lymphocytes in lymphocytes in lymphonde, spleen than groups 4,5.

원통 연삭에서 가공 능률 향상을 위한 연삭 저항의 측정에 관한 연구

김원일,이진,이윤경,왕덕현,이상복,이관철,문원길 경남대학교 공업기술연구소 2000 硏究論文集 Vol.18 No.-

본 연구에서는 원통 연삭 가공에서 가공 능률 향상을 위한 연삭 저항을 측정하고자 연삭 가공 중에 발생하는 연삭 저항의 추이를 확인하였고 다음과 같은 결과를 얻었다. 숫돌과 공작물간의 연삭 강성은 공작 속도의 증가에 따라 지지계의 강성이 높은 경우 증가하였고 절삭 깊이와 연삭 숫돌의 속도에는 연삭 강성이 감소하는 경향을 보였다. 또한 총합 강성은 공작 속도, 절삭 깊이 및 연삭 숫돌의 속도 증가에 따라 지지계의 강성이 높을 수록 증가하였다. 연삭기의 강성 변형과 가공 능률에 영향을 주는 값으로 연삭 강성비는 지지계의 강성이 높을 수록 감소하였다. In this study, the measurement of grinding resistance to improve grinding efficiency in cylindrical grinding was studied and the following conclusions could be obtained. Relation grinding wheel and workpiece, grinding stiffness increases according to increase of work speed for high machine stiffness and decreases depth of cut and grinding wheel speed. Also, resultant stiffness increases high machine stiffness according to increase work speed, depth of cut and grinding wheel speed. The values of the effect stiffness deflection in grinding machine, grinding stiffness ratio decrease according to high machine stiffness.