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김달현,박해원,이세경,구자용,김구영 韓國非破壞檢査學會 1994 한국비파괴검사학회지 Vol.14 No.3
진공도가 10-¹¹Torr 수준의 초고진공 상태에서 작동되고 실제공간에서 개별원자를 구별할 수 있는 주사형 터널링 현미경을 제작하였다. 주사형 터널링 현미경의 배경 및 작동원리와 제작에 있어서의 제문제점들을 서술하고 흑연결정과 실리콘에 대해서 관찰한 결과를 보고한다. A scanning tunneling microscope has been built, which can resolve atomic arrangements of conductors and semiconductors in ultra high vacuum below 10-¹¹Torr. Its background operational principles are reviewed and the guide lines in building the scanning tunneling microscope are shown. The results of measurements for highly oriented pyrolytic graphite and Si(111) surface are presented
公共圖書館法 硏究 : 韓國, 日本, 美國, 英國을 中心으로 comparative Study
崔達鉉 경북대학교 1987 社會科學 Vol.6 No.-
Public library movement of United States and United Kingdom, so called the developed countries, is characterized by the upward one compared with the downward in Korea and Japan. In other words, libraries are originally the concern of local governments in the former whereas the central government initiated the public library movement in the latter. And there was a great difference between these two blocks in the preparation of public library legislation. In the US and UK every library law is a product of many studies carried out by governmental and professional research projects. In Korea, there has been a long silence since the 1964 library law was enacted. Responding to the need of information age, the law was revised thoroughly in October, 1987. However it still remains as an insufficient library law, for it lacks lots of necessary provisions for fulfilment of the current requirements to achieve pulic library's goal elucidated in Unesco Public library Manifesto. Major deficiences in the law are such problems as free library use, government unit for library services, appointment of professional personnel in all kinds of libraries, securing a firm and enduring library expenses, and library education and remuneration for librarians, etc. These might be the important future problems to solve.
박달원,이현복 공주대학교 사범대학 과학교육연구소 1995 과학교육연구 Vol.26 No.1
행렬은 비교적 복잡한 형태로 이미 존재하는 개념에 대한 축약적인 표현이며 행렬은 일차변환으로부터 발생된 개념이다. 실제세계에서의 구체적이니 자료로부터 비형식적인 이론과 형식적인 이론으로의 진전을 포함하는 형식화와 공리화의 과정을 겪게 하는 진정한 의미에서의 수학화를 학생들이 배우도록 하기 위하여 행렬은 일차변환으로부터 지도가 시작되어야 한다. Matrices is a compact expression for idea which already exist in more expanded from. Matrices arose in the linear transformations. In order that students learn mathematization in genuine meaning that is experience formalization and axiomatization process including advance from concrete materials in real world to non-formal theory and formal theory, teaching of matrices should start from linear transformations.
圖書館目錄上 번자표기의 實態와 諸 問題 : 우리나라 公共 및 大學圖書館을 中心으로
崔達鉉 慶北大學校 1979 論文集 Vol.28 No.-
Librarian and bibliographers in the world have been greatly concerned in Universal Bibliographic Control(UBC) during 1970's in which various international activities occurred. Transliteration is one of the major problems to have an effective control of bibliography all over the world. So far many people have believed that Romanization was a unique and standard method to acquire an integrated world bibliography. However, many points at issue relating to Romanization have come to the fore again in recent years. In order to analyse the present situation of transliteration in Korea, I made a survey of script conversion practices in 101 public and university libraries through the questionnaires of which 67 libraries responded. I'd like to draw up some suggestions to alleviate the present situation. Firstly, it's desirable to separate the author-title catalog into three parts: Korean and Chinese, Japanese, and Roman alphabet. Secondly, in subject catalog, book entries with the same subject heading but in the different language should be filed by scripts. In order that libraries may bring together the same script entries, I propose to add a sort of symbol or letter to the end of each subject heading. Thirdly, the standard scheme for transliteration available to all the libraries in Korea should be established as soon as possible. Fourthly, translations from other languages into Korean should be entered under Korean main entry. Fifthly, our national bibliographic agency must take a more positive activities in which providing model of transliterated cataloging card for both Korean and foreign librarians is included.
圖書利用頻度 分析에 의한 學生利用 圖書量測定에 관한 硏究 : 大學圖書館 學部學生을 中心으로
崔達鉉,孫正彪 慶北大學校 文理科大學 1975 文理學叢 Vol.3 No.-
This study is an attempt to present a model for a more reasonable, economical standard of building a library collection for undergraduates students. On the basis of various circulation data of external and internal literature, the following methods of calculation for the study were employed: 1) A quantitative standard for undergraduate students was calculated by the exponential function derived from Trueswell's figure % of Circulation satisfied vs. % of Holdings satisfying circulation and Leimkuhler's hypothetical table for Relative use of stored items. 2) A standard for the annual increase of the collection was made by a formula derived from the principle of half-life in nuclear physics. 3) A statistical method for the measurement of duplication were formulas applied by the standard deviation and the coefficient of variation. The scope of this study was set up quantitatively by the number of students and limited to the circulation of books taken-out in the general collection. Other standards were excluded. The result of this study is as follows: First, the setting up the quantitative standard by solving of an equation of exponential function. C_q=K^avt_e, derived from the figure by Trueswell and Leimkuhler, revealed that colleges and universities will have to maintain the following ration of books to undergraduate students: 1) The minimum-more than 9 volumes per student. 2) The optimum-more than 14 volumes per student. Secondly, the standard of the annual increase of collection, a result of calculating the formula, N=N_oe^-λT, derived form the principle of half-life in nuclear physics, shows that colleges and universities will have to maintain the following ratio of books to undergraduate students: 1) The minimum-more than 0.62 volumes per student. 2) The optimum-more than 0.97 volumes per student. Thirdly, concerning the increase in student demand for duplication, colleges and universities will have to maintain a level of duplication to be calculated by the following formula derived from the standard deviation and coefficient of variation: 1) The quantity satisfying 99.73%…X_199.73%=X_1av+3×S/X×X. 2) The quantity satisfying 99.45%…X_199.45%=X_1av+2×S/X×X.
정수현,김달수 명지대학교 예체능연구소 2003 藝體能論集 Vol.14 No.-
The purpose of this study is to analyze amateur baduk players' viewpoint on their lives, especially in relation to their job, by means of participant-observation and in-depth interview. Amateur baduk players are engaged in a variety of baduk activities and have been causing some conflict with the group of professional players because of their ambiguous status. Understanding their way of living and thinking, therefore, will be able to help resolve some troubles aroused by the subtle relationship with an institutional baduk organization The result indicates that. 1) They devote themselves to the baduk-related jobs with a firm consciousness that baduk is of their calling, although they have no license as a professional expert on baduk. 2) They would not have a will to proceed to other realms because they recognize the lack of knowledge and experience about them, which was caused by their long-time absorbtion to baduk. 3) Their everyday life is characterized by low income, unrestricted freedom, and indulgence to drinking. Most of them tend to enjoy getting together for drinking after work and communicating with their colleagues. 4) They have an Utopian concept of baduk, being enthralled by the strong attraction of the game and making an extraordinary effort in the study of it. 5) They seem to keep a deep regret in their mind against their long-cherished dream of being a professional was frustrated. This is sometimes manifested in the movement of organizing an institution hostile to Hankook-Kiwon(Korean Baduk Association). Since this study relies mainly on the researchers' personal interpretations on several amateur players' discourse, it should be investigated in various ways, qualitative or quantitative.
李鉉雨,高義石,金正達 慶南大學校 附設 工業技術硏究所 1987 硏究論文集 Vol.5 No.-
直流 平等電界중에서 電氣的 負性氣體인 SF?가스와 N₂가스를 混合시킨 경우 破壤電壓과 PMMA 스페이서가 존재하는 경우 沿面放電特性을 760〔torr·cm〕이하에서 조사 검토한 結果를 要約하면 다음과 같다. 1. SF?, N₂,SF?/N₂가스 混合가스중에서 스페이서가 없는 直流平等電界의 破壤强度는 파센곡선에 따랐으며 電極과 스페이서의 接觸狀態가 完全한 경우도 거의 직선적으로 증가했다. 2. 스페이서가 없는 경우와 스페이서와 電極이 完全한 경우는 가스 種類에 관계없이 極性效果는 나타나지 않고 電極과 스페이서간에 接觸缺陷이 있는 경우 負極性 閃絡電壓은 正極性의 경우보다 낮았다. 3. pd≥500〔torr·cm〕범위에서는 스페이서 效率이 낮게 나타나고 pd?200〔torr·cm〕범위에서는 閃絡電壓이 가스壓에 依存한다. 4. SF?30〔%〕N₂70〔%〕混合가스의 경우 N₂단독가스와 비교해 볼 때 약 2.2배의 絶綠强度를 나타내므로 N₂가스에 소량의 SF? 가스를 混合하여도 閃絡電壓은 매우 높게 된다. Surface Breakdown Characteristics of Spacer in SF?/N ₂Compressed Gas. The flashover voltages have been investigated for PMMA spacer and unbridged-gap in SF?/N₂gas mixtures up to the value of 760(torr·cm), The gap was stressed by DC source The results obtained are as follow; 1. The flashover voltages for an unbridged gap and for a spacer in SF?/N₂gas mixtures follow the Paschen's curve. 2. The polarity effects was not observed in both unbridged gap and a spacer which had perfect contacts with an electrodes. The flashover voltages for negative polarity are lower than those for positive polarity in case of imperfect contacts. 3. 3% flashover voltages is decreased by the putting a spacer which had perfect contacts with an electrodes. The spacer which has gap void shows the lowest flashover voltages. 4. The lowest spacer efficiency was obtained with higher gas pressure & large amount of N₂content. The flashover voltages depend on the gas pressure rather than the spacer efficiency at low valuse of pd. 5. The flashover voltage of gas mixtures of N₂with SF? are relatively high, even though the amount of SF? gas content is small.