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李炳贊 啓明大學校 産業經營硏究所 1986 經營經濟 Vol.19 No.1
The world economy in 1980's presents low growth rate, high industrial competition and protectionism in international trade. For increasing competitive power, enterprises endeavor to develop new products through research and development, and to enhance productivity and reduce costs by management rationalization. Important developments in the rationalization of production and operations management are Material Requirement Planning technique in America and Kanban System in Japan. From those methods well-managed U.S. firms were turning inventories ten to twenty times a year, and Japanese firms in repetitive manufacturing were reporting inventory turns of 50 to 100 times per year. This paper first described the classical inventory control method which could be illustrated as economic lot size, and derived MRP which is more practical and time phasing method. Toyoda Kanban System was researched in the following. The structure of Toyoda System could be summarized two main pillars as automation by human and just-in-time (JIT) system. The latter JIT is thought to be more important subject and stand for Kanban System. Therefore the meaning and characteristics of JIT was defined. Operation and circulation of kanban, production planning and control by the system are studied too. The criteria to improve inventory control based on JIT were discussed finally. In other words, set-up cost reduction and their impact on lot sizing decisios, size of time bucket, and lead time management should be examined to introduce JIT effectively and control inventory economically. Kanban System or Just-In-Time is derived and developed from interaction of cultural base and operation environment and from trial and error for long time in Japanese businesses, especially in Toyoda Motors Company. Therefore it would be somewhat impossible to adopt the system thoroughly by merely knowing the theory or introducing its formal control procedures. None the less our Korean business should be active to introduce the JIT system and to continue practical study in order to improve productivity and reduce costs. It is hoped that this study would be a catalyzer for future extensive research in auto-parts industry.
이병찬,권영직,신호균 대구대학교 산업기술연구소 1989 産業技術硏究 Vol.8 No.-
This study first searched the theoretical background of programmar productivity related with white coller productivity and carried an empirical study for improving the productivity. In experimental study, productivity was not measured by programming cost but by central processing unit time(qualitative aspects), and it was analyzed by COBOL language and 16 bit personal computer. Also, three file organization method and three access method were selected with this experiment. The experiment was conducted with test data for a programs by individual programming. The result was that relative file is more efficient regardless of updated ratio in file organization and dynamic method of random method is more efficient in file access method in case of 500 updated data, random access method in more efficient in the other cases. Also sequential was more efficient in input in case of 500 updated data, and relative file was efficient in output.
李秉讚 대진대학교 1996 大眞論叢 Vol.4 No.-
This study is the work that I have researched the plot on <NAMWONGOSA>, one of the representative another volumes of the <CHUNHYANGJUN>. The characteristic of this novel is the longest story among the <CHUNHYANGJUN> that were written before 20th century and is composed of more than about one hundred thousand words. It's plot is largely divided into the former part and the latter. The former part is the first meeting, the true love, and the parting course. The latter is expressed with the course in which the two characters must overcome the trial of their loves and relieve the pain each other. They are destined to meet the desperate love in the former part, but as a resolt they have to achieve their profound love with their happy ending.
회전 압축기와 왕복동식 압축기의 쉘 내부공간 공명 소음 저감법
이병찬 忠州大學校 2003 한국교통대학교 논문집 Vol.38 No.2
This study is about noise reduction of hermetic rotary compressor in air conditioner and reciprocating compressor in household refrigerator. Especially, it is about method to reduce the low-frequency band noise which is related to shell cavity resonance. The method of reducing noise for the same shell cavity resonance in rotary compressor and reciprocating compressor is different from each other. Shell cavity resonance frequencies are derived from experiments and analyses. The position of discharge muffler outlet hole is determined to minimize cavity resonance in the rotary compressor. The cavity resonance modes of hermetic reciprocating compressor are the major factors of the 400 ~ 630Hz in 1/3 octave band noise spectrum. Di-pole type cavity modes make high contribution to the total noise level in the reciprocating compressor. In order to avoid shell cavity resonance frequencies under reciprocating compressor operating condition, new shell design is made.
李炳讚,閔潤植,池明順,趙載敏 충주대학교 산업과학기술연구소 2002 産業科學論文集 Vol.10 No.-
The study was carried of out to investigate the effects of water on the fermentative characteristics of the mixed and needed dough and the quality of white pann bread produced by using of Distilled water(DW), Mineral water (MW) and Hot spring water(SW). The results of the characteristics of dough and the quality of white bread measured were as the follow. 1. Mineral water showed higher swelling in the fermentation processing but it was lower in the loaf volume at the baking stage. 2. In the quality, the loaf volume of baked bread made by using of Mineral water and Hot spring water was higher then Distilled water. 3. The measured hardness of baked bread made by using of Distilled water was lower then Mineral water and Hot spring water As the result of this quality test, the white bread made of Mineral water and Hot spring water was showed excellent result.