• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2003년도 ICCAS
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• pp.2298-2303
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• 2003

In this paper, very simple methods based on the exponential analysis are presented by which transfer function models for processes can easily be obtained. These methods employ step responses or impulse responses of the processes. These can also give a more precise transfer function model compared to the well-known graphical methods. Transfer functions are determined based on Prony method, which is one of the oldest and the most representative methods in the exponential analysis. Here, the method is reformed and applied to obtain the so-called low-order transfer function with pure time delay from the data of the step response. The effectiveness of the proposed method is examined through several numerical examples and experiments of the 2-tank level control process.

• 소성∙가공
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• 제7권5호
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• pp.489-495
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• 1998

Spinning is a chipless forming method for producing axially symmetric parts by using axial-radial motions of a spinning roller. This process has still some advantages in such a view point that a variety of complex shapes which can not be formed in a press can be easily spun at a low cost although it is one of the oldest forming methods for spinning mainly cookware parts for a long time. This study is to investigate the optimum roller path in order to obtain the maximum spinnability in producing cylindrical cups of Aluminum(A1050-H16) sheet metal. Working conditions applicable to any size of blank were predetermined through preliminary spinning tests. 9 types of roller path were proposed and experiments were carried out. The modified involute curve was shown to give the maximum drawing ration and more uniform quality of spun cups as compared with other results of this study. in addition thickness distribution and dimensional accuracy of spun cups were examined and discussed.

• 대한치과의사협회지
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• 제19권3호통권142호
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• pp.269-274
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• 1981

Several patients of trigeminal neuralgia were observed pathologically. The results were as follows. 1. Three of five were female and two of five were male. The oldest was 76-year-old man and the youngest 49-year-old woman. The average age was 59.4 years. 2. The main division of involvement was third branch and two cases were combined with infra orbital nerve. 3. There was no constant pathologic changes in nerve tissue, but capillary proliferation were observed in perineural connective tissue in two cases. In one case, there was microneuromatic lesion and mild schwann cell proliferation. But in general, there were nonspecific pathological changes in nerve fiber.

• 한국주거학회논문집
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• 제13권2호
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• pp.15-22
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• 2002

This paper aims to analyze the changes in the living arrangements of the elderly in Chejoo-do for the elderly housing supply by using census data. The conclusions are as follows; The rate of living alone and living with spouse only of the elderly have been increasing. The trend in county was higher than that in city. Living alone rate of the elderly of Chejoo-do was higher than that of Korean average. Even in the oldest old, living alone rate has been increasing in Chejoo-do. It is a unique phenomenon in Korea and similar with U.S. In Chejoo-do, it is strongly required to evolve elderly housing by universal design for living alone elderly in county as well as for living alone elderly in city.

• 천문학논총
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• 제10권1호
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• pp.109-125
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• 1995

According to historical records, Woon-Ju-Sa temple in Hwa-Soon, Chollanamdo, have had one thousand stone buddhas and one thousand stone pagodas, located south-west hill side of Woon-Ju-Sa is the Seven-Star-Stone(SSS). It consist of seven circular rocks with varying sizes that form a pattern similar to the constellation Ursa Major. SSS(Seven Star Stone) is an important astronomical remain because it might be one of the oldest records showing stellar brightness in Korea. We have compared the sizes of 888s with the magnitudes of stars of Ursa Major. It is found that the sizes of SSSs do roughly represent the magnitudes of Ursa Major stars in a way consistent with the magnitude scale used in Chun-Sang-Yul-Cha-Bun-Ya-Ji-Do(天象列次分野之圖) of Chosun.

• 천문학회지
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• 제43권4호
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• pp.135-139
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• 2010

We present the result of our investigation on the impact of the low Solar abundance of Asplund and collaborators (2004) on the derived ages for the oldest star clusters based on isochrone fittings. We have constructed new stellar models and corresponding isochrones using this new solar mixture with a proper Solar calibration. We have found that the use of the Asplund et al. (2004) metallicity causes the typical ages for old globular clusters in the Milky Way to be increased roughly by 10%. Although this may appear small, it has a significant impact on the interpretation for the formation epoch of Milky Way globular clusters. The Asplund et al. (2004) abundance may not necessarily threaten the current concordance cosmology but would suggest that Milky Way globular clusters formed before the reionization epoch and before the main galaxy body starts to build up. This is in contrast to the current understanding on the galaxy formation.

• 한국의사학회지
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• 제20권1호
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• pp.7-12
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• 2007

Wang Hao Gu is a famous Chinese medical scientist of the 13 century. He studied the oldest classic in China, Huangjaenaekyung, and also studied Zhangzhongjing's medical documents. He was influenced by contemporary medical scientists Zhang Yuan Su and Li Dong Yuan, and came up with an original medical theory Yinzheng. Although he is of considerable importance in the history of medicine, not many studies on him were done in Korea although Korean medicine was influenced by Chinese medicine. This study focuses on the study of his insight on medical stuffs and theory of Shanghan.

• 한국의사학회지
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• 제20권1호
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• pp.22-29
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• 2007

Lisangsokdanbang is the oldest known medical document in existence. It is, however lost-its original copy could not be traced. But the contents of Lisangsokdanbang quoted in Uibangyuchwi, a document published in Chosun in 1447. Thus this study aims to restore the contents of Lisangsokdanbang based on Uibangyuchwi and present the synthesis of facts on Lisangsokdanbang extracted from the reference books.

• 한국문헌정보학회지
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• 제20권
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• pp.473-491
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• 1991

Summarizing the conclusion of this article is following this: 1. Donginjimun-ouchil(동인지문오칠) published at the close of Koryo, is not only the oldest anthology but also the only one of the same kinds that we have in present. 2. Donginjimun-ouchil is consist of 9 Kweons. We can know the fact through comparing samhansiguegam(삼한시구감), becouse it seems to summerize Donginjimun-ouchil. 3. Donginjimun-ouchil is different from other books and espically has a speial features which in eluding profils about the characters. 4. With additional punctuation marks in profile and critiism marks, we can know the rule of punctuation mark and at the same time it can give many assistances to the study of poetics.

• 한국지구과학회지
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• 제31권5호
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• pp.430-436
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• 2010

Some materials belonging to the Leptostrobus myeongamensis Kim were found in the Upper Triassic Amisan Formation, Nampo Group, Korea. This species is closely associated with the foliage of Czekanowskia ex gr. rigida Heer. Although none of Leptostrobus myeongamensis Kim has been found in organic connection with Czekanowskia leaves, it is considered that they belong to the same taxa based on their common occurrence. The occurrence of Leptostrobus myeongamensis Kim from the Late Triassic floras of Korea is one of the oldest records in the Mesozoic floras found in the world.