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홍순영,신영섭,홍성용,Hong, Soon-Young,Shin, Yeoung-Seop,Hong, Sung-Yong 한국전자파학회 2007 한국전자파학회논문지 Vol.18 No.4
위성 DMB용 중계기는 위성으로부터 수신된 2.304 MHz의 기준 신호를 이용하여 10 MHz의 클럭 신호를 재생하여 시스템 동기 신호로 사용한다. 본 논문에서는 기준 신호가 잡음에 의해 흔들리거나 끊기더라도 안정된 신호를 재생할 수 있는 클럭 재생 모듈을 제안하였다. 제안된 모듈은 기존 방식에 비해 저가로 구현이 가능하며, 정기적인 주파수 조정이 필요 없는 장점이 있다. 본 논문에서는 클럭 재생용 IC를 CPLD를 이용하여 구현하였고, lock time을 짧게 하면서 동시에 출력 주파수의 hold over 시간을 늘리기 위해 새로운 루프 필터를 적용하였다. 제작된 모듈은 출력 주파수의 안정도가 0.01 ppm 이내일 경우 hold over 시간이 11초, 출력 전력은 -0.66 dBm, 위상잡음은 100 Hz 오프셋에서 -113 dBc/Hz로 측정되었다. The clock recovery module of gap filler for satellite DMB is proposed. Proposed module sustains the output frequency of 10 MHz whether the received signal from the satellite is unstable or cut off within 0.5 sec. The advantages of this module is without frequency tuning at regular interval and low material cost. This module is fabricated by using CPLD as clock recovery IC and new type of loop filter for satisfying the fast lock time and long hold over time simultaneously. The measured performance of the fabricated module has a holdover time of 11 sec at frequency stability less than 0.01 ppm, and phase noise of -113 dBc/Hz at 100 Hz offset.
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Cataloging in Publication (CIP) 및 그 도입에 관한 소고
洪淳英 이화여자대학교 한국문화연구원 1983 韓國文化硏究院 論叢 Vol.42 No.-
The idea to make the cataloging information available at the time of cataloging had been thought of by many librarians and tried out in various forms. Cataloging in publication is the latest outcome of this very idea. This not only holds essential cataloging information in the new publication, but also has come to provide other benefits to librarians, publishers, and library users. Since CIP was started by the United States in 1973, many countries are now utilizing the program and a set of practical recommendations for CIP program was prepared at the 1982 IFLA meeting. It is the purpose of this paper to review the CIP program and several points that might be raised if it were put to trial in Korea. In view of geographical and organizational consideration, the centralized operation with the National Central Library as the center would be perhaps the ideal choice for Korea; NCL is receiving every new publication under the Copyright Act and it also is experimenting KORMARC which is expected to be in utilization in the near future. In addition, professional cooperation and assistance from library associations to the center will be essential to make the program professionally sufficient. Although the recently stabilizing publishing business will encourage publishers understanding and cooperation for the program, their compulsory participation similar to that in the Copyright Act might be necessary.
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우리나라 대학도서관 업무의 전산화 및 그 실현에 관한 연구
洪淳英 韓國圖書館學會 1985 圖書館學 Vol.12 No.1
We have come to the time when we no longer ask why we computerize, but we need to concentrate on how to effectively accomplish the task. Application of computers has been very active in many fields in Korea during the last few years. And yet libraries are rather slow in taking adventage of computers most likely due to the lack of adequate funds and proper understanding of administrators, but also it seems that the majority of librarians are not quite prepared to adopt it. The purpose of this paper is to study the various aspects of computerization of library work, mainly for library administrators and librarians; although they need not understand the electronical and technical aspects of computers, but they should prepare themselves enough at least to be able to make proper requests to computer specialists in relation to what they want to accomplish with computers in order to improve the work of the library. In preparing this paper, not only successful cases of computer application which had been carried out in many libraries of advanced countries have been studied, but also various reasons for failure have been reviewed in order not to make the same mistakes. The paper covers those areas of library work where computers can be applied, such as feasibility, cost effectiveness, planning, implementation and some other aspects of computerization. As a conclusion, two viewpoints need to be discussed. First, each library should work cooperatively with other libraies instead of trying to develop its own computer programs, since we cannot affort to waste financial and technical resources as well as time. Computer applicable library work can be divided and assumed by certain libraries with responsibility to develop turn-key system applicable to Korean university libraries. In order to carry out this task, there should be complete financial assistance from government, and in turn those libraries should be required to offer assistance to any other interested libraries in Korea. Secondly, library school curriculum should offer such courses where future librarians can learn decision making, business administration and independent thinking in addition to traditional courses. Future librarians as well as those who are already in the profession should prepare themselves to meet the challenge of the professional requirements in order to meet the ever increasing and diverse needs for good quality service generated from the library users
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홍순영,함영일,강영길 한국식물병리학회 2003 식물병연구 Vol.9 No.3
This study was conducted to clarify developmental characteristics of scab in potato fields in Jeju island, Korea from 1995 to 1999. Occurrence of potato scab increased with repeated cultivation of potato and high soil pH in the fields. Incidence of the disease was as high as 54.8% in the repeatedly cultivated potato fields but relatively low as 20.8~26.3% in the non-cultivated fields and in the fields where barley and Chinese cabbage were formerly cultivated. A total of 66 isolates were obtained from the diseased potato tubers and identified as Streptomyces scabies, S. turgidiscabies and S. acidiscabies. The isolation frequency of each Streptomyces species was 37.7%, 14.8% and 18.0%, respectively. The optimum temperature for mycelial growth of the Streptomyces spp. was 28~30oC, and the optimum pH for that 6~7.
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