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클러스트링 기법의 성능 분석 및 칼라 양자화에 대한 응용
차지훈,박지연,전도홍 한국컴퓨터교육학회 1999 컴퓨터교육학회 논문지 Vol.2 No.4
본 논문에서는 퍼지 신경학습망에 의한 클러스트링의 성능을 분석하기 위해 기존의 클러스트링기법인 K-means와 신경망 모델에 의한 SOM을 함께 비교 조사한다. 각 알고리즘들은 인위적으로 생성한 기하학적 데이터 공간에서의 모의실험을 통해 그 성능과 특징을 도출한다. 또한 각 기법들의 화상이미지의 칼라 양자화에 대한 응용성을 검토하기 위해 실험을 통한 결과를 정량적인 측정값인 왜곡치와 처리속도의 관점에서 비교 분석한다.
Removal of epoxy resin from carbon fiber reinforced polymer composites with superheated steam
차지훈,이지영,이연식 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.0
Waste carbon fiber reinforced polymer (CFRP) composites have caused economic and environmental problems. Thus, the development of an effective method for the recycling of such waste is needed. In this study, the superheated steam-induced degradation method was chosen for removal of epoxy from waste CFRP, among various degradation method such as thermal, mechanical, and solvolytic processes. The degradation products were analyzed by GC-MS. In order to more clearly understand the degradation mechanism, model epoxy materials were prepared using diglycidylether of bisphenol A and either diaminodiphenyl sulphone or diaminodiphenyl methane as an oligomer epoxy resin and a curing agent, respectively. And then they were treated with superheated steam under the same conditions as for the waste CFRP. Other simpler compounds were also prepared, and degraded under the identical conditions. The experimental results will be presented in detail along with the proposed degradation mechanism.
차지훈,조경은,엄기현 동국대학교 영상문화콘텐츠연구원 2009 영상문화콘텐츠연구 Vol.0 No.-
A Game Evaluation Technique with EEG Measures Um, Ky-hyun Game Evaluation is the process of evaluating the quality of the game and checking internal error of the game, which is on the verge of commercialization. Shortcomings of the existing Game Evaluation are that it is not only easy to collect objective data but easy to evaluate user experience. In this paper, the degree of concentration measured by user's electroencephalogram(EEG) is analyzed statistically and the methodology which applies in game design evaluation and game contents evaluation is proposed. Electroencephalogram helps to measure objective and quantitative state of the user and additional paper work process, which is indispensable in the past research method will be eliminated. Degree of concentration is the criterion of the user’s immersion in game and it enables to evaluate the overall design of the game. Furthermore, contents of the game will be evaluated by degree of concentration. Game evaluation based on the degree of concentration will help to overcome shortcomings of the past research methods. Also, it will be a counterproposal of the quantitative evaluation to check user’s experience. 게임 평가는 상용화를 앞둔 게임 개발 과정에서 게임 내의 오류를 검사하고 게임의 품질을 평가하는 과정이다. 기존의 게임 평가 방법은 객관적인 자료의 수집이 힘들고 사용자의 경험을 측정하는데 쉽지 않다는 단점을 갖고 있다. 이에 본 연구에서는 뇌전도를 통해 측정된 집중도를 통계적 분석으로 해석하고, 이를 게임 디자인 평가와 게임 콘텐츠 평가에 적용하는 방법을 제안한다. 뇌전도를 이용해 객관적이고 정량적인 사용자의 상태를 계측할 수 있고, 기존의 평가 방법에서 필요로 하는 플레이 이후의 문서 작성 과정을 제거할수 있다. 집중도는 게임의 몰입 정도를 파악하는 척도로써 게임의 전반적인디자인 평가와 이벤트 발생 시의 콘텐츠 평가를 가능케 한다. 뇌전도를 이용한 집중도 기반의 게임 평가는 기존 평가 방법의 단점을 극복하고, 정량적인사용자 경험 측정을 위한 새로운 대안이 될 것이다.
차지훈,안무업,김동원,이상규,이창현,김상미,김정혁,김형기,한재현,박경숙 대한응급의학회 2019 대한응급의학회지 Vol.30 No.5
Objective: The aim of this study was to identify the latent class, according to the risk factors, of the patients hospitalized due to intentional self-harm by lethal means. Methods: The risk factors were derived by categorizing the intentional self-harming measures by lethal (hanging, pesticide poisoning, jumping, and drowning) and non-lethal (drug poisoning and stab) measures and comparing the demographics, diseased state, and suicide-related characteristics. Latent class analysis was performed to identify the type of intentional self-harm. Results: Male (sex), elderly (age), rural (residing location), and comorbid diseases were found to be the risk factors for fatal injuries. For this, four latent classes were modeled. Factors, such as the age group between 20 to 40 years, women, and family conflict were included in the first class. The second class included the age group between 30 to 50 years, men, and financial problems. The third class covered the age group between 60 to 70 years and comorbidity. The fourth class contained the age group of 10 to 50 years, women, and mental problems. The rate of suicide and choice of fatal suicide was ranked in the order of 3 (62.7%, 21.5%), 2 (59.8%, 13.9%), 4 (36.8%, 5.7%), and 1 (29.5%, 5.9%). Conclusion: A lethal mean access control policy needs to be established for the high-risk group of self-harm. Moreover, establishing an emergency room-community link prevention policy could help reduce the re-suicide attempt among suffering patients.