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유정석 ( Jeong-seok Yoo ),홍지훈 ( Ji-hoon Hong ),정준권 ( Jun-kwon Jung ),정태명 ( Tai-myoung Chung ) 한국정보처리학회 2014 한국정보처리학회 학술대회논문집 Vol.21 No.1
최근 인터넷이 발전함에 따라 월드와이드웹(World Wide Web) 기반의 웹 서비스가 급격한 발전을 이루었다. 또한 이 웹 서비스를 바탕으로 다양한 컨텐츠들과 이를 이용하는 사용자의 수도 함께 증가하였다. 그러나 이와 같은 웹 서비스의 보편화가 증대될수록 이를 악용하려는 사이버 범죄 또한 비례하여 증가하고 있다. 최근에는 공격자들이 스마트폰을 대상으로 악성코드를 전파하기 위한 방법으로 웹 서비스를 활용하기 시작하면서 웹 서비스의 보안에 대한 중요성이 더욱 강조되고 있다. 이러한 웹 서비스 보안의 필요성을 인지하고, 많은 사람들이 무료로 쉽게 웹 서비스 보안취약점을 진단 할 수 있도록 여러 오픈소스 기반의 보안 취약점 진단도구가 연구, 개발되고 있다. 하지만 웹 서비스의 보안약점을 진단하는 도구의 적합성 평가 및 기능 분류가 명확하지 않아서 진단도구를 선택하고 활용함에 있어 어려움이 따른다. 본 논문에서는 OWASP에서 위험도에 따라 선정한 웹 서비스의 보안 취약점 Top 10 항목과 소프트웨어 보안약점 진단가이드 등을 통해 웹 서비스 보안 취약점을 진단하는 도구에 대한 분석 기준을 제시한다. 이후 오픈소스로 공개된 테스트 기반 취약점 탐지도구와 소스 기반 취약점 진단도구들에 대해 제시한 기준을 이용하여 분석한다. 본 논문의 분석결과로 웹 서비스의 안전성을 평가하기 위해 활용할 수 있는 진단 도구에 대한 분석정보를 제공함으로써 보다 안전한 웹 서비스의 개발과 운영에 기여할 것으로 기대한다.
유정석(Yoo, Jung-Seok),한광령(Han, Kwang-Leong) 한국체육과학회 2012 한국체육과학회지 Vol.21 No.3
This study is based on the purpose of understanding the current status and problems of Taekwondo organizations with those who are working for or in activities for the international Taekwondo organizations, and finding success factors of innovation for international Taekwondo organizations on the theoretical basis. The concrete subjects of this study were about, firstly, what are the success factors in individual characteristics for the innovation of international Taekwondo organizations? Secondly, what are the success factors in managerial characteristics for the innovation of international Taekwondo organizations? In order to get those answers, I set up the frame of the theoretical reference through the documentary study prior to the data collection, and chose the qualitative methodology as a series of study method. 19 study participants were selected by the purposeful sample among those who have businesses or activities related to the international Taekwondo organizations, and the data collection was made through interviews with them through the narrative and semi-structured interviews as well as the telephone interview. In conclusion, for the success factors in individual characteristics for innovation of international Taekwondo organizations, the individual creativity, outer-directedness, and learning orientation were found, and their stronger tendencies were more related to success factors for innovation in the aspects of individual characteristics. For the success factors in managerial characteristics for innovation of international Taekwondo organizations, sharing knowledge, task autonomy, and leadership were found, and these were more related to success factors for it in the aspects of managerial characteristics.
300MW급 실증 가스화기의 최적 운전조건 및 성능 예측
유정석(Yoo, Jeong-Seok),구자형(Koo, Ja-Hyung),백민수(Paek, Min-Su),이황직(Lee, Hwang-Jik) 한국신재생에너지학회 2008 한국신재생에너지학회 학술대회논문집 Vol.2008 No.05
The optimal operation condition of gasifier is one of the most important parameters to increase efficiency and reliability in IGCC plant. Also the prediction of the syngas composition and quantity must be predicted to carry out process design of the gasification plant. However, the gasifier process licensor are protective with information on process design and optimal gasifier design conditions. So, the most of process studies in the engineering company for gasification plant have carried out to look for key parameters and optimal design conditions using several prediction methods. In this paper, we present the estimated preliminary optimal operation condition of the 300MW Demonstration Entrain Flow Gasifier using Aspen Plus. The gasifier operation temperature considering slag flow was predicted by FactSage software and Annen Model.
석탄 IGCC 플랜트 성능예측을 위한 공정모델 기술개발
유정석(Jeongseok Yoo),백민수(Minsu Paek),김유석(Youseok Kim) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.5
The optimal operation condition of gasifier is one of the most important parameters to increase efficiency and reliability in IGCC plant besides key design condition. But, the gasifier process providers are protective with information on process design and optimal gasifier design conditions. So, the most process studies in the engineering company for gasification plant have carried out to look for key parameters and optimal design conditions using several prediction methods and demonstration test. The predicted performance using Aspen Plus provide net plant efficiency of 41~42% and net electric power of 302MWe.
유정석(Yoo, Jeongseok),김유석(Kim, Youseok),백민수(Paek, Minsu) 한국신재생에너지학회 2013 신재생에너지 Vol.9 No.3
The gasification process has developed to convert coal into the more useful energy and material since decades. Despite the numberous design of ones, entrained flow gasifier of the major companies has had an advantage on the market. Because it has a merit of full-scale and high performance plant. In this paper, the gasification technologies of GE energy, Phillips, Siemens and Shell have been reviewed to compare their characteristics and a high performance gasification process was suggested. And the simulation model of gasifiers using Aspen Plus offered the quantitative comparison data for difference designs. The simulation results revealed the poor performance of the slurry feed than dry design. The corresponding cold gas efficiency of 77% is much lower than the 80.3% for the dry feed cases. The exergy analysis of the difference syngas quenching system showed that chemical quenching is superior to another. The results of analysis recommend the two stage gasifier with dry multi-feeder as the energy effective design.
유정석(Yoo, Jung-Seok) 한국체육과학회 2013 한국체육과학회지 Vol.22 No.4
This study is based on the purpose of understanding the current status and problems of Taekwondo organizations with those who are working for or in activities for the international Taekwondo organizations, and finding disturbance factors of innovation for international Taekwondo organizations on the theoretical basis. The concrete subjects of this study were about what are disturbance factors of innovation for international Taekwondo organizations?. In order to get those answers, I set up the frame of the theoretical reference through the documentary study prior to the data collection, and chose the qualitative methodology as a series of study method. 19 study participants were selected by the purposeful sample among those who have businesses or activities related to the international Taekwondo organizations, and the data collection was made through interviews with them through the narrative and semi-structured interviews as well as the telephone interview. this study could be summarized as follow: For disturbance factors of innovation for international Taekwondo organizations, complexity, centralization, and communication were found. Firstly, complexity was related with establishment of task force team. Secondly, centralization was related with power and authority. Thirdly, communication was related with language communication, exchanges between national organizations as well as relating organizations, and individuals.