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KVN MONITORING OBSERVATIONS TOWARD THE RECENT OUTBURST SYMBIOTIC STAR V407 CYGNI
조세형,김재헌,윤영주 한국천문학회 2015 Journal of The Korean Astronomical Society Vol.48 No.5
Simultaneous time monitoring observations of H$_{2}$O and SiO maser lines were performed toward the D-type symbiotic binary system V407 Cyg with the Korean VLBI Network single dish radio telescope.These monitoring observations were carried out from March 2, 2010 (optical phase $\phi$ = 0.0), 8 days before the nova outburst on March 10, 2010 to June 5, 2014 ($\phi$ = 2.13). Eight days before the nova outburst, we detected the SiO $v$ = 1, 2, $J$ = 1--0 maser lines which exhibited values of 0.51 K ($\sim$ 6.70 Jy) and 0.71 K ($\sim$ 9.30 Jy), respectively, while after the outburst we could not detect them on April 2 ($\phi$ = 0.04), May 5 ($\phi$ = 0.09), May 8 ($\phi$ = 0.09), or on June 5, 2010 ($\phi$ = 0.13) within the upper limits of our KVN observations. After restarting our monitoring observations, we detected SiO $v$ = 2, $J$ = 1--0 masers starting on October 20, 2011 ($\phi$ = 0.83) and detected SiO $v$ = 1, $J$ = 1--0 masers starting on December 22, 2011 ($\phi$ = 0.92).These results provide clear evidence of the interaction between the shock from the nova outburst and the SiO maser regions of the Mira envelope.The peak emission of SiO $v$ = 1, 2, $J$ = 1--0 masers always occurred at blueshifted velocities with respect to the stellar velocity except for that of SiO $v$ = 1 at one epoch. These phenomena may be related to the redistribution of SiO maser regions after the outburst. The peak velocity variations of SiO masers associated with stellar pulsation phases show an increasing blueshifted trend during our monitoring interval after the outburst.
조세형,Jo, Se-Hyeong 한국정보처리학회 2001 정보처리학회논문지B Vol.8 No.6
This paper describes a method for stemming of Korean language by using unsupervised learning from raw corpus. This technique does not require a lexicon or any language-specific knowledge. Since we use unsupervised learning, the time and effort required for learning is negligible. Unlike heuristic approaches that are theoretically ungrounded, this method is based on widely accepted statistical methods, and therefore can be easily extended. The method is currently applied only to Korean language, but it can easily be adapted to other agglutinative languages, since it is not language-dependent. 본 논문은 태그가 없는 단순 말뭉치만을 가지고 자율학습을 이용하여 정보 검색을 위한 색인어의 추출 등에 이용될 수 있도록 한국어의 실질 형태소와 형식 형태소를 분리해내는 기법에 대하여 기술한다. 본 기법은 사전 등의 언어 관련 지식을 요구하지 않으며 오직 단순 말뭉치만을 필요로 한다. 또한 자율학습을 이용함으로써 사람의 간섭이 필요하지 않아 학습에 필요한 시간과 노력이 거의 들지 않는다. 본 방식은 잘 확립된 통계적 방법론을 이용하기 때문에 일반적인 휴리스틱과는 달리 이론적인 기반이 확고하여 확장 및 발전이 용이하다. 본 결과는 한국어에 우선 적용되었으나 한국어에 종속적인 방법이 아니어서 다른 교착어에도 쉽게 적용될 수 있을 것이다.
정보시스템의 전략적 활용 성과의 실증적 측정에 관한 연구
조세형 한국정보전략학회 2000 한국정보전략학회지 Vol.3 No.2
This paper provides variables and a framework for evaluating empirically the strategic performance of information systems which are used to obtain competitive advantage. Three variables are extracted from preceding studles and tested using empirical data, which can be used for measuring the strategic performance of information systems empirically. These are user functionality of customer resource life cycle, value activity efficiency and contribution to organizational performance. The framework identifies four phases in regular sequence: considering contextual factors, selecting variables to measure, selecting methods of measurement, and interpreting measurement results. This model suggests the contingency approach to find the effective measurement programs.