슬관절 전치환술로 치료한 한국 및 미국 골관절염 환자군의 비교

김회천,Fitzgerald, Robert H. Jr.,Lotke, Parul A. 대한노인병학회 2002 대한노인병학회지 Vol.6 No.1

한국수산업의 해외진출전략에 관한 연구

김회천 한국수산경영학회 1984 수산경영론집 Vol.15 No.1

Fishery resources are still abundant compared with other resources and the possibility of exploitation is probably great. The Korean fishery industry has grown remarkably since 1957, and Korea is ranked as one of the major fishery countries. Its output of fishery products reached the 9th in the world and the value of exports was 5th in 1982. But recently a growth rate has slowed down, due to the enlargement of territorial seas by the declaration of the 200 mile, Exclusive Economic Zone, the tendency to develop fishery resources strategically in international bargaining, the change in function of the international organizations, the expansion of regulated waters, the illegal arrest of our fishing boats, the rapid rise in oil prices, and the fall in fish prices, the development of fishery resources as a symbol of nationalism, the fishing boats decrepitude, the rise of crew wages, regulations on fishing methods, fish species, fishing season, size of fish, and mesh size, fishing quotas and the demand of excessive fishing royalties. Besides the obligation of coastal countries, employing crews of their host countries is also an example of the change in the international environment which causes the aggravation of foreign profit of fishing firms. To ameliorate the situation, our Korean fishery firms must prepare efficient plans and study systematically to internationalize themselves because such existing methods as conventional fishing entry and licence fishing entry are likely to be unable to cope with international environmental change. Thus, after the systematic analysis of the problem, some new combined alternatives might be proposed. These are some of the new schemes to support this plan showing the orientation of our national policy : 1. Most of the coastal states, to cope with rapid international environmental change and to survive in the new era of ocean order, have rationalized their higher governmental structure concerning the fishery industries. And the coastal countries which are the objectives of our expecting entry, demand excessive economic and technical aid, limit the number of fishing boats' entry and the use of our foreign fishing bases, and regulate the membership of the international fishery commissions. Especially, most of the coastal or island countries are recently independent states, which are poorer in national budget, depend largely on fishing royalties and licence entry fees as their main resources of national finance. 2. Alternatives to our entry to deep sea fishing, as internationalization strategies, are by direct foreign investment method. About 30 firms have already invested approximately US $ 8 million in 9 coastal countries. Areas of investment comprise the southern part of the Atlantic Ocean, the Moroccan sea and five other sea areas. Trawling, tuna purse seining and five other fields are covered by the investment. Joint-venture is the most prominent method of this direct investment. If we consider the number of entry firms, the host countries, the number of seas available and the size of investment, this method of cooperation is perhaps insufficient so far. Our fishery firms suffer from a weakness in international competitive ability, an insufficiency of information, of short funds, incompetency in the market, the unfriendliness of host coastal countries, the incapability of partners in joint-ventures and the political instability of the host countries. To enlarge our foreign fishing grounds, we are to actively adopt the direct investment entry method and to diversify our collaboration with partner countries. Consequently, besides proper fishing, we might utilize forward integration strategies, including the processing fied. a. The enterprise emigration method is likely to be successful in Argentina. It includes the development of Argentinian fishing grounds which are still not exploited in spite of abundant resources. Besides, Argentina could also be developed as a base for the exploitation of the krill resources and for further entries into collaboration with other Latin American countries. b. The co-business contract fishing method works in American territorial seas where American fishermen sell their fishery products to our factory ships at sea. This method contributes greatly to obtaining more fishing quotas and in innovating bottom fishing operations. Therefore we may apply this method to other countries to diffuse our foreign fishing entry. c. The new fishing ground development method was begun in 1957 by tuna long-line experimental fishing in the Indian Ocean. It has five fields, trawling, skipjack pole fishing and shrimp trawling, and so on. Recently, Korean fisheries were successful in the development of the Antarctic Ocean krill and tuna purse seining. 3. The acceleration of the internationalization of deep sea fishing: a. Intense information exchange activities and commission participation are likely to be continued as our contributions to the international fishery organizations. We should try to enter other international fishery commissions in which we are not so far participating. And we have to reform adequately to meet the changes of the function of the international commissions. With our partner countries, we ought to conclude bilateral fishery agreements, thus enlarging our collaboration. b. Our government should offer economic and technical aids to host countries to facilitate our firms' fishery entry and activities. c. To accelerate technical innovation, our fishery firms must invest greater amount in technical innovation, at the same time be more discriminatory in importing exogeneous fishery technologies. As for fishing methods: expanded use of multi-purpose fishing boats and introduction of automation should be encuraged to prevent seasonal fluctuations in fishery outputs. d. The government should increases financial and tax aid to Korean firms in order to elevate already weak financial structure of Korean fishery firms. e. Finally, the government ought to revise foreign exchange regulations being applied to deep sea fishery firms. Furthermore, dutes levied on foreign purchased equipments and supplies used by our deep sea fishing boats thould be reduced or exempted. when the fish caught by Korean partner of joint-venture firms is sold at the home port, pusan, import duty should be exempted.

창호와 발코니 형상에 의한 화염의 분출성상에 따른 온도변화에 대한 연구

김회천,손장열,박형주 대한건축학회 2007 대한건축학회논문집 Vol.23 No.2

In buildings, windows and doors have architectural functions and environmental accommodation factors while balcony is also ruled as architectural element of shock absorbing space connecting inside and outside of the building. But, though the disaster preventing factors of these members are also one of important functions, we haven't considered this seriously. If the sectional fire develops enough for flame to erupt through windows and doors, the phenomena of eruption become different according to shapes of windows, doors and the balcony while the significance of preventing the disaster is much great such as changing the influence of temperature affecting upper floors and the spread of fire becoming diverse. Accordingly, this paper has assessed the erupting image of flame influence of temperature affecting the surrounding environment followed by diversity of shapes in windows and balconies by building an actual sample room with similar size and shape in order to duplicate the fire of public housing. In addition, by study the spread of fire due to the shape of balcony and comparing with temperature conditions assessed by actual model, we shall overcome the limitations of experiment possessed by actual model and find out whether the fire experiment using scale model can be the alternative.

냉동공장 방열자재의 발달사

김회천,Kim, Hoe-Cheon 대한건축사협회 1970 建築士 Vol.5 No.12

냉동 공조용 압축기의 고효율 BLDC 모터 설계 및 특성 분석

김회천,한준희,정태욱 대한전기학회 2012 대한전기학회 학술대회 논문집 Vol.2012 No.7

연기의 제어(I)

김회천 한국화재소방학회 1992 한국화재소방학회논문지 Vol.6 No.1

가정용 BLDC 전동기 세탁기의 운전특성 시뮬레이션

김회천(Hoe-Cheon Kim),정태욱(Tae-Uk Jung) 대한전기학회 2012 전기학회논문지 Vol.61 No.7

This paper studied about the measurement method of the instantaneous dynamic load characteristics. this experimental study, we derived the instantaneous washing load characteristics and inertial moment characteristics according to the amount of laundry and water level. Also, this studied about the dynamic driving characteristics simulation method for the prediction of washing performance based on this load characteristics analysis. For this study, the design parameters of the driving motor are obtained by FEM analysis and the experiment. By using theses motor parameters and load characteristics, the instantaneous driving characteristics simulation is accomplished and it is verified with the experimental result of various driving conditions. The results of this paper would be very useful to the prediction of washing mode operation characteristics, and it can be also utilized to the washer motor control algorithm design for the washing performance improvement.

무드조명 제어기의 직류전원 회로 개발

김회천(Hoe-Chun Kim),정태욱(Tea-Uk jung),김태현(Tae-Hyun Kim),안현근(Hyon-Geun An) 대한전기학회 2010 대한전기학회 학술대회 논문집 Vol.2010 No.7

본 논문은 현재 사용되는 가정용 또는 사무실용 조명제어기의 단순한 전기접점 방식의 온/오프 스위치를 지능형 전원회로로 지능형 조명제어가 가능하게 개발하였다. 기존의 지능형 스위치는 제어를 위해 D+, D-, GND로 구성되어 신규주택만 사용가능 하며, 기존주택에 사용할 수 없었다. 이를 기존주택에도 사용할 수 있게 연구하였으며, 최근 거주 공간의 안락함과 심미적인 부분을 추구하는 성향이 높아짐에 따라 햅틱 기능을 갖는 진동 터치판넬(Touch panel) 온/오프 스위치와 LED 조명을 이용한 무드라이트를 제어할 수 있게 하였다.

동기전동기의 개방고장에 따른 고장특성에 관한 연구

김회천(Hoe-Cheon Kim),정태욱(Tae-Uk Jung) 한국조명·전기설비학회 2012 조명·전기설비학회논문지 Vol.26 No.11

Recently, permanent magnet synchronous motor are applied to various applications. Because of the importance of high reliable operation in these areas, many research related to the fault detection and diagnosis of inverter system are conducted. So, a faults model for an inverter-driven permanent magnet synchronous motor is studied by using the fault current of motor according to switch open, which can be effectively used for performance evaluation of the diagnostic algorithm. And fault of the permanent magnet synchronous motor inverter drive system is divided into four types. The feasibility of the proposed method are improved by simulation and experiment.

펌프용 소형 BLDC 모터의 원가절감을 고려한 회전자 최적화 설계

김회천(Hoe-Cheon Kim),정태욱(Tae-Uk Jung) 대한전기학회 2013 전기학회논문지 Vol.62 No.4

In the present study, a BLDC motor for a pump in which a neodymium PM is replaced with a Ferrite PM has been developed in preparation for the cost increase and to ensure the stability of the resource supply. One of the currently used motors for pumps is a BLDC motor having an interior PM wherein a rare-earth PM is adopted. However, a BLDC motor for a pump is designed to have large airgap because of the use of a waterproof insulator according to its structural characteristics, and therefore, a SPM structure is suitable. Hence, an SPM BLDC motor in which a Ferrite PM is used is designed. Nevertheless, the use of Ferrite instead of rare-earth materials causes a deterioration in the performance of the electric motor, such as a decrease in the BEMF and the maximum power of the motor and the irreversible demagnetization of the PM. In order to mitigate such disadvantages, an optimized design of the BLDC motor is developed by changing each design parameter and by improving the electromagnetism structure.