• Journal of KIISE:Databases
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• v.32 no.3
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• pp.297-303
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• 2005

When confronted with a query, question answering systems endeavor to extract the most exact answers possible by determining the answer type that fits with the key terms used in the query. However, the efficacy of such systems is limited by the fact that the terms used in a query may be in a syntactic form different to that of the same words in a document. In this paper, we present an efficient semantic query expansion methodology based on a question category concept list comprised of terms that are semantically close to terms used in a query. The semantically close terms of a term in a query may be hypernyms, synonyms, or terms in a different syntactic category. The proposed system constructs a concept list for each question type and then builds the concept list for each question category using a learning algorithm. In the question answering experiments on 42,654 Wall Street Journal documents of the TREC collection, the traditional system showed in 0.223 in MRR and the proposed system showed 0.50 superior to the traditional question answering system. The results of the present experiments suggest the promise of the proposed method.

• Proceedings of the Korea Information Processing Society Conference
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• 2016.10a
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• pp.753-754
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• 2016

스트레스는 매일 살아가면서 사소한 일부터 큰 충격을 받는 삶의 주요한 사건까지 다양한 요인으로 부터 온다. 이는 어느 한 시기에만 나타나는 것이 아니라 인간의 전 생애에 거쳐 나타나므로 지속적으로 스트레스를 관리할 수 있는 연구가 필요하다. 이에 본 논문은 홍채의 형태, 균열, 색깔, 고리, 주름 등의 특징들을 분석하여 환자의 병을 진단하는 홍채진단을 이용하여 스트레스 지수를 측정하는 시스템을 개발하였다. 개발한 시스템은 홍채의 특징인 스트레스 고리를 검출하고, 스트레스 설문지의 결과와 함께 분석하여 안드로이드 어플리케이션을 통해 사용자에게 스트레스 정도를 제공한다. 제안한 시스템은 사용자가 언제 어디서나 쉽게 현재 자신이 느끼고 있는 스트레스 정도를 알 수 있고 이에 상응하는 예측되는 질병에 대해 예방하여 조기 진단 및 질병 예방의 하나의 방법으로 사용할 수 있다.

• Proceedings of the KIPE Conference
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• 2003.07a
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• pp.150-153
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• 2003

한전 전력연구원은 기준 발전소 시뮬레이터가 없는 고리1호기 원자력발전소의 현황을 고려하여 주제 어실은 없지만 고리1호기의 운전특성을 나타내는 전범위 시뮬레이터개발의 1단계로서 강사 및 운전원 모니터에 나타나는 Soft Panel 만으로 운전훈련이 가능 하도록 하는데 목표를 두고 원자력발전소 운 전원 훈련용 시뮬레이터를 개발 하였다. 본 논문에서는 상기의 개발내용 중에서 시뮬레이션 시스템 구성, 컴퓨터별 주요기능, 강사제어 프로그램, 운전원제어 프로그램, Simulation Diagram 화면, Soft Panel 화면, 시뮬레이터 연동 등에 대한 내용을 기술하고자 한다.

• Proceedings of the KIEE Conference
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• 2001.07c
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• pp.1823-1825
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• 2001

고리형 반도체-광섬유 레이저 공진기 안에 높은 복굴절률을 가지고 있는 편광 유지 광섬유 루프 거울을 삽입하여 새로운 구조의 다파장 발진 시스템을 제안하고 구현하였다. 이득 매질인 반도체 광 증폭기의 특성으로 인해 실온에서 파장 간격이 1 nm 이내인 22 개의 파장의 빛을 발진시킬 수 있었다.

• Korean Journal of Optics and Photonics
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• v.6 no.2
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• pp.115-121
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• 1995

본 논문에서는 일체형, Nd:YAG 고리 레이저에서 서로 반대방향으로 진행하는 두 모드의 비선형적인 상호작용에 의한 출력 불안정 현상을 조사하였다. 실험을 통하여 두 모드가 각각 단일 종모드로 발진함을 확인하였고, 레이저가 발진하는 임계치 부근의 낮은 펌핑수준을 유지하여 다중모드간의 경쟁이나 단방향 발진에 의한 출력 불안정이 아님을 확인하였다. 또한 잘 알려진 시스템 고유의 감쇄진동과 구별되는 현상임을 보였다. 두 모드간의 손실차가 클수록 이 출력의 변조주파수는 증가하고 변조폭이 줄어 들어 안정화 되며 단방향 발진이 일어난다.

• Journal of Science Education
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• v.37 no.1
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• pp.157-169
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• 2013

The purpose of this study is to analyze carbon cycle concepts based on earth systems from the perspective of high school students. The subjects for this study were seven students who have completed Earth-science I curriculum. to analyze of carbon cycle concepts based on earth systems perspective, the methods of word association, casual map and drawing were used. The results of this study were as follows: first, 5 out of 7 students have suggested carbon cycle concepts less than three. Second, the carbon cycle concepts on the change of state were 2. Also, the carbon cycle concets on process were 8. Third, 2 out of 7 students present 2 feedback loops, 3 out of 7 students 1 feedback loops, but 2 out of 7 students couldn't present the feedback loops associated with carbon cycle. Finally, As for carbon cycle concepts through drawing, 1 out of 7 students drew 9 concepts, 3 out of 9 students drew 7 concepts and the rest of them drew 5, 4, 3 concepts respectively. These results suggest that concept and feedback loop thinking skills on carbon cycle are a low level. Therefore, It is suggested that more educational programs be developed on various topics in order for high school students to improve their system thinking skills as well as knowledge integration of earth systems.

• Journal of the Korean Institute of Intelligent Systems
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• v.22 no.5
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• pp.563-569
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• 2012

The studies of opinion mining or sentiment analysis have been the focus with social web proliferation. Sentiment analysis requires sentiment resources to decide its polarity. In the existing sentiment analysis, they have been built resources designed with intensity of sentiment polarity and decided polarity of opinion using the ones. In this paper, I will present sentiment categories for not only polarity of opinion but also the basis of positive/negative opinion. I will define psychological emotions to primary sentiments for the reasonable classification. And I will extract the informations of sentiment from social web texts for the actual distribution of sentiments in social web. Re-classifying primary sentiments based on extracted sentiment information, I will organize sentiment categories for the social web. In this paper, I will present 23 categories of sentiment by using proposed method.

• Proceeding of EDISON Challenge
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• 2016.03a
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• pp.113-115
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• 2016

온실가스의 주범을 친환경적으로 활용한다는 측면과 carbon source를 영구적으로 저렴한 비용으로 공급할 수 있다는 경제적 측면에서 CO2를 활용한 고부가가치 화학물질의 합성이 최근에 주목 받고 있다. 본 연구에서는 살렌(salen)-전이금속 착물을 단일 촉매로 사용한 모델 시스템을 통해 고부가가치 소비재의 주된 원료인 고리형 카보네이트 (cyclic carbonate)와 폴리카보네이트 (polycarbonate)가 생성되는 반응경로를 규명하였으며, 이들의 활성화 에너지를 조절함으로써 생성물을 선택적으로 합성할 수 있다는 이론적 근거를 제시하였다.

• Smart Media Journal
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• v.6 no.1
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• pp.61-67
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• 2017

A large number of people living in modern times prefer remaining unmarried or living alone independently for the reason of their own will or another person's will. This is because they dislike being interfered with by other persons or because there is a financial problem. This behavior has become mainstream in persons working for professional jobs, persons having a strong disposition toward individual activity or college students. In particular, career women pursuing their own comfortable life have the tendency to prefer single life. However, sometimes, they become a target of crime that targets and makes bad use of this point. For these reasons. Consequently, sometimes, they additionally install and use a security system such as door security guard at front door and so on. It is not so difficult to lock the door security guard at the front door. However, it is apt to be forgotten. And when they are on the bedspread before falling asleep, in case they should check whether the door security guard is locked or in case they should lock it, they should get up, go to the entrance, and check and lock the door security guard. They often don't lock the door security guard due to their feeling that it is all right because of annoyance and inconvenience. This paper is intended to work for safety from crime such as illegal housebreaking by more conveniently using the door security guard after designing and implementing a system that can remotely control the door security guard, using a smartphone as a method of resolving this annoyance and keeping life more safe.

• Journal of KIISE:Information Networking
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• v.28 no.3
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• pp.309-320
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• 2001

This paper deals with security issues in a mobile agent system, especially protecting agent data from malicious agent servers. For this purpose, one-time key generation system, OKGS in short, is proposed. In OKGS, we integrate notions of a one-way hash function and a coupler. One-way function plays a major role in ensuring confidentiality and integrity of agent data. And the notion of a coupler is used to establish inter-relationship among consecutive encryption keys for agent data, i.e. all agent keys form a unidirectional chain. With these two features of OKGS, therefore, only the agent owner, who creates the agent bearing data, can decrypt and protect all the agent data which are gathered in the itinerary.