• Korean Security Journal
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• no.17
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• pp.53-68
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• 2008

The purpose of this study is to investigate about security service history as enlightenment period from the provisional government to 1920s. This study used materials by historical facts for the regulations and books in provisional government, newspapers in 1920s. There are four parts conclusion of this study: police department of provisional government, security service agency in the provisional government, security service agents of an independence movement, the general society of Korea. Firstly, Kim Gu, a prominent Korean nationalist leader, was understand of security service which was to protect provisional government from the enemy. So, Kim Gu participated in training of security service agents in the police department of provisional government. Secondly, there was security service agency in the provisional government. In 1920s, security service agency and agents appeared for the first time in regulations of the provisional government. At the beginning of the security service agency's appearance was influenced on background and circumstances for Korean independence activist who helped the independence of Korea from Japan. Thirdly, security service agents leaded an active for independence movement of the private organizations in 1920s. They carried on an independence movement in defiance of Japanese coercion as nationalist in Korea history. Fourthly, security service came out the general society of Korea in 1920s. The security service was not just for safety, but also for its security system and peace of mind, which were influenced by the political situation, social environment in 1920s. For the this reason, now security service has safety perception in Korea despite the historical progress.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2002.11a
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• pp.70-73
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• 2002

본 논문체서는 2001.12월 중국국무원 의결 36호 전신체제 개혁방안에 의해 중국전신 남ㆍ북 분할계획이 확정된 이후 신산부의 분리작업을 거쳐 2002.5.16일 중국네트웍통신그룹(중국망통)의 창립식을 갖고 중국 전신에서 정식으로 분리 출범하였다 따라서 중국의 신규 중국망통은 북경, 천진, 요녕, 길림 등 북부지역 10개성ㆍ시의 통신자산 일체를 중국전신에서 이관 받아 관장하게 되어 두 회사는 상대방 관할 지역에서는 상호 영업할 수 있게 되었다. 그리고 유선전화 부문에서도 본격적인 경쟁체제가 이루어지고 있으며, 중국망통 설립으로 매출액기준 통신사업자별 시장점유율은 중국전신: 33.8% 중국네트웍통신: 17.2%; 중국이동통신: 36.6%; 중국연통: 11.3%; 중국위성과 중국철도통신: 1.1%를 차지하게 되었다. 중국전신의 분할, 중국 마이크로소프트 회사와 MOU 체결, 차이나텔레콤과 SKT간 합작회사 설립 MOU 체결, 중국 국가 정보화 영도팀 제2차 회의결과 내용, 중국의 VDSL 시장출현 둥 중국의 IT 산업정보에 대한 전반적인 내용을 다룸으로써 우리나라의 IT전망을 조망하여 본다.

• Journal of the Korean Wood Science and Technology
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• v.39 no.3
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• pp.230-237
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• 2011

The study was performed to investigate the characteristics of charcoal and temperature change of a kiln's inner and outer walls in carbonization process using improved kiln. In this kiln system, carbonization process was completed in eight days. In the kiln, the ignition temperature was kept about $720^{\circ}C$. And then the temperature were increased gradually prior to be refined. Finally, the temperature in refining process was reached to maximum point, $1,000^{\circ}C$. In the chimney, the temperature was increased gradually from $90^{\circ}C$ at ignition to $750^{\circ}C$ at refining. The temperature change of the kiln wall resembles a temperature change progress curve during a carbonization process. The highest temperature of the kiln wall that appeared by a carbonization process was around $500^{\circ}C$. As a result of having measured an inner wall and the outer wall of the kiln using an infrared thermography camera, it was judged with there being considerable latent heat on kiln wall and ceiling. Fixed carbon contented of charcoal was 85.9~89.9%. Refining degree of charcoal, hardness, calorific value and pH were l, 12, 7,047~7,456 kcal/kg, 9.0~9.9, respectively. The yield of wood charcoal was 13.8%, and compared to conventional kiln's yield increased 1.5%.