정밀금형 알루미늄 합금 주물에서의 잔류응력 측정에 관한 연구

김채환,문수동,강신일,Kim, Chae-Hwan,Mun, Su-Dong,Gang, Sin-Il 대한기계학회 1999 大韓機械學會論文集A Vol.23 No.11

One of the main causes of unwanted dimensional changes in precision metal mold casting parts is excessive and irregular residual stresses induced by temperature gradients and plastic deformation in the solidifying shell. Residual stresses can also cause stress cracking, and lower the fatigue life and fracture strength of the casting parts. In the present study, aluminum alloy casting system with metal mold equipped with electrical heating elements and water cooling units was designed and the casting specimens were produced to quantify the effects of different cooling conditions on the development of residual stresses. The layer removal method was used to measure the biaxial residual stresses in casting specimens produced from the experiments. The experimental results agreed with Tien-Richmond's theoretical model for thermal stress development for the solidifying metal plate.

인터넷 뉴스 댓글의 이용과 상호작용성의 만족도에 관한 연구

김채환 ( Chae Hwan Kim ) 한국지역언론학연합회 2009 언론과학연구 Vol.9 No.1

DMS와 방송매체의 경쟁구도에 대한 적소분석 연구

김채환(Chae-Hwan Kim) 한국방송학회 2006 한국방송학보 Vol.20 No.5

인터넷 신문의 만족도와 부가적 콘텐츠 서비스 이용의 변화에 관한 연구

김채환 ( Chae Hwan Kim ) 한국커뮤니케이션학회 2006 커뮤니케이션학연구 Vol.14 No.2

UCC의 이용동기와 재이용 의도에 관한 연구

김채환(Chae-Hwan Kim) 부산울산경남언론학회 2008 지역과 커뮤니케이션 Vol.12 No.1

본 연구는 UCC의 이용행태와 이용동기를 알아보고, 이용동기가 만족도에 주는 요인과 만족도가 재이용 의도에 어떻게 작용하는지를 이용과 충족 접근의 이론적 틀을 통해 분석을 시도하였다. 이를 위해 대학생을 대상으로 설문조사를 실시하여 실증적인 연구방법으로 분석을 시도하였다. UCC의 이용동기에 대해서는 요인분석을 통해 "정보유익성", "상호참여성" , "업무표현성", "오락휴식성"의 4개 요인이 추출되었고, UCC의 이용에 대한 만족도에서는 편리성과 품질의 2개 요인이 추출되었다. 이들 UCC의 이용동기 4개 요인 중에서 UCC 만족도의 편리성 요인에는 "정보유익성"이 가장 중요한 요인으로 나타났고, 품질 요인에 는 "상호참여성"의 요인이 가장 영향을 많이 주는 것으로 나타났다. 한편 UCC 이용의 만족도 요인 중에서는 편리성 요인이 UCC의 재이용 의도에 품질 요인보다 큰 영향력이 있음을 알 수 있었다. This study explored three questions: (1) What are the motives of using user-created contents(UCC), (2) What are the motives of satisfactions that users gain from UCC, and (3) What are the UCC reusing motives by individual satisfactions factors. The survey was conducted to 275 UCC university student users and data were factor-analysis to find the using motives abd satisfactions by Uses and gratification approach. As for the motives of UCC uses, four factors were conducted: information benefit, work expression, interactive participation, and amusing entertainment. As for the satisfactions, two factors were conducted: using easiness and using quality, information benefit of UCC using motives showed the largest variation in using easiness of UCC satisfactions. Interactive participation of UCC using motives showed the largest variation in using quality in UCC satisfactions. Easiness of UCC satisfactions showed the largest variation in reusing intentions.

온라인 신문의 이용 변화에 관한 연구

김채환(Chae-Hwan Kim),안수근(Su-Geun Ann) 한국언론정보학회 2004 한국언론정보학보 Vol.26 No.-

본 논문은 온라인 신문의 이용에 대한 1999년과 2004년의 장기적인 변화를 분석한 연구이다. 이를 위해 이용과 충족 접근 방식을 통하여 온라인 신문 이용자들의 이용 동기는 무엇이며 온라인 뉴스의 이용과 만족도에 5년 동안의 변화를 살펴보았다. 온라인 신문의 이용동기는 ‘정보/편리성’, ‘상호작용성’, ‘여가성’의 3가지 요인으로 추출되었다. ‘정보/편리성’은 온라인 신문의 이용 동기와 만족도에서 1999년보다 2004년에 낮아졌으며, ‘상호작용성’과 ‘여가성’은 높게 나타났다. 온라인 신문에서 뉴스의 이용정도에서는 전체적으로 1999년보다 2004년에 낮게 나타났다. 종류별 온라인 뉴스의 이용 정도에서 1999년에는 ‘톱’, ‘정치’ 등의 순이었고, 2004년에는 ‘사람들’, ‘오피니언’으로 순으로 높게 나탄ㅆ다. 온라인 뉴스의 종류별 만족도에서 1999년에는 ‘톱’, ‘경제’, ‘정보/과학’이 높았고, 2004년에는 ‘사람들’, ‘오피니언’, ‘방송/연예’가 차지했다. This longitudinal study examines changing factors readers of online newspaper on 1999 and 2004. In terms of Uses and Gratification approach, this survey explore changing what is motives of online newspaper readers, using and satisfying of online news during five years. The factor analysis of Online newspaper's reading motive statements yielded three interpretable factors: 'informativeness-convenience", "interactivity', 'entertainment'. First, 'informativeness-convenience' on 2004 was lower than '99 in online newspaper reading motives and satisfying, but factor of 'interactivity and 'entertainment' measured that 2004 was higher than '99 in that of online newspaper. A level of reading online newspaper on 2004 is lower than '99. 'people' and 'opinion' is highest reading online newspaper item. But that of '99 is 'top news' and 'political news'. Top news', 'economics' and "infor-mation/science' is highest satisfying level of online news item on '99, but that of order changed into 'people', 'opinion' and 'broadcasting/enter-tainments' on 2004. In conclusion, this study shows online newspaper readers perceived interactive service and entertainment tactor.

부산지역 언론사의 온라인 서비스 특성과 전략에 관한 연구

김채환(Chae-Hwan Kim),이화행(Hwa-Haeng Lee) 한국언론학회 2003 한국언론학보 Vol.47 No.6

This study examines the online services of local newspapers and broadcasting stations, with a focus on characteristics of the online services, strategies used by them, and successful business models. Face-to-face interviews were conducted in Busan to find out information about group structures, management, profit models, and prospects for local online papers and broadcasting stations. Their online contents were also compared. This research indicates three outcomes. First, the online services of local newspapers and broadcasting stations in Busan have been managed in various ways including as an independent department, subordinate department, or a lone corporation. Second, in regard to benefits, most newspaper companies seek profit, while network companies emphasize program introduction and P.R., depending on their head office. Third, the online services mainly support news and information and lack using their sites as businesses and two-way communications services. They also cannot afford to serve in English and offer movie files. Finally, the present paper offers suggestions for what local newspapers and broadcasting stations should do in the future. They should develop their own content on Busan-related issues, create content exclusively for their online service, support a public sphere for the discussion of local issues, offer industrial-educational cooperation, and keep in close touch with other local newspapers and broadcasting stations.

사출성형된 자동차 내장재에서의 잔류응력 측정

김채환(Chae Hwan Kim),김성호(Sungho Kim),오화진(Hwajin Oh),윤재륜(Jae Ryoun Youn) 한국자동차공학회 2007 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-

Injection molding represents one of the most important processes for manufacturing plastic parts, but introduces residual stresses. This study employs incremental hole drilling method to evaluate the residual stress on injection molded automotive part. In order to verification the results, the commercial software Moldflow is used for residual stress analysis. Results obtained by experiments and Moldflow analysis agree with each other. The incremental hole-drilling method is potentially more applicable to determination of the residual stress in complex geometries and can be used as an adoptable technique for measurement of the residual stress in polymeric materials.

공업용 플라스틱 성형품에 대한 잔류응력의 측정

김채환(Chae-hwan Kim),윤재륜(Jae Ryoun Youn) 한국소성가공학회 2006 한국소성가공학회 학술대회 논문집 Vol.2006 No.5

한국,중국,베트남 이동통신 이용자의 IMC 요인 인식 차이와 해외진출 전략에 관한 연구

임채관 ( Chae Kwan Lim ),김채환 ( Chae Hwan Kim ),정성호 ( Seong Ho Cheong ),유승관 ( Seung Kwan Ryu ) 한국PR학회 2009 PR연구 Vol.13 No.1

This study aimed to investigate the structural relationship and difference of IMC(integrated marketing communication) factors, corporate image, brand image, service quality, and customers` satisfaction of Korean, Chinese and Vietnamese mobile telecommunication users. In doing so, this paper suggested reasonable IMC strategies and oversea markets. This study conducted survey for each mobile telecommunication users: Koreans(303), Chinese(244), and Vietnamese(179). Based on this survey, this study employed empirical analysis and proposed comprehensive IMC strategies, which are suitable for each countries. As a result, IMC factors have positively impacted on corporate and brand image, and so good corporate and brand image have a positive influence on service quality and ultimately customers` satisfaction for Korean mobile telecommunication users. However, this study found out that brand image and service quality were not statistically significant for Chines and Vietnamese users.