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김채환(Kim, Chaehwan) 동서언론학회 2015 동서언론 Vol.17 No.-
본 연구는 청소년의 휴대전화 의존도를 결정하는 주요 요인을 탐구함으로써 궁극적으로는 이들의 휴대전화 의존도를 감소시키는 실증적 자료를 제공하고자 함과 동시에 휴대전화 의존도가 학교생활적응에 미치는 영향을 살펴보는데 그 목적을 두었다. 분석 결과 청소년의 휴대전화 사용 목적은 2010년 1차 조사 당시에는 ‘친구와 문자 메시지’, ‘시간보기’, ‘친구와 통화’, ‘가족과 통화’ 순으로 휴대전화를 자주 사용하고 있었으며, 3차 조사에서는 ‘시간보기’, ‘친구와 문자 메시지’, ‘친구와 통화’, ‘음악듣기’ 순으로 휴대전화를 사용하고 있었다. 휴대전화 의존도를 낮추는 주요 요인으로 1차 조사에서는 ‘자기 통제감’, ‘자존감’, ‘가족과 통화’, ‘가족과 문자 메시지’, 3차 조사에서는 ‘자기 통제감’, ‘자존감’, ‘가족과 통화’ 순이었다. 한편 휴대전화 의존도 유형별로 살펴본 결과 고(高)의존군의 경우 1차 조사에서는 ‘자기 통제감’과 ‘가족과 통화’, 3차 조사에서는 ‘학습활동’, ‘자기 통제감’, ‘가족과 통화’, ‘자존감’ 순으로 나타났다. 저(低)의존군의 경우 1차 조사에서는 ‘교사관계’, ‘자기 통제감’, ‘학교규칙’, 3차 조사에서는 ‘자기 통제감’ 순으로 나타났다. 학교생활적응에는 휴대전화 의존도가 부적인 관계로 나타났으나, 하위변인 교우관계에 있어서는 긍정적인 역할을 했으며, 자아성향 자기통제감이 학교생활적응에 있어서도 주요한 변인으로 나타났다. 본 연구결과 조사 차수와 의존 유형을 막론하고 휴대전화 의존도를 낮추고 학교생활 적응을 높이는 유의미한 예측 변인으로 ‘자기 통제감’이 주요한 역할을 하고 있었다. The purpose of this study was to investigate th effects of mobile phone dependency on school life adjustment of youth, A data of Korean Child-Youth Panel Survey(KCYPS) was employed in 2010, 2012. The resultsof study were as follows: First, major purpose of mobile phone use in 2010 were ‘texting(short messaging service) with friends’ and ‘checking the time’. Girls were more likely to use mobile phone than boys. But that of 2012 were ‘checking the time’ and ‘texting(short messaging service) with friends’. Second, major reduce facts of mobile phone dependency in 2010 was self-control, self-esteem, communication with family, short messaging service with family. Finaly, school life adjustment was negative correlated with mobile phone dependency, but that was positive correlated with friendship.
김채환(Chaehwan Kim),김성호(Sungho Kim),오화진(Hwajin Oh),윤재륜(Jae Ryoun Youn) 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.11_3
Injection molding is a flexible production technique for the manufacturing of polymer products, but introduces residual stresses. Residual stresses in a structural material or component are those stresses which exist in the object without other external loads. This paper introduces two comparative methods that can be used for the measurement of residual stress. The layer removal and hole drilling method are used for the measurement of residual stress in injection molded polystyrene part. Results obtained by experiments agree with each other. The hole drilling method is potentially more flexible for determining residual stress in complex geometries and can be used as an adoptable technique for the measurement of residual stress in polymeric materials.
김성호(SUNGHO KIM),김채환(CHAEHWAN KIM),오화진(HWAJIN OH),윤재륜(JAE RYOUN YOUN) 한국자동차공학회 2007 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Injection molding is one of the most common operations in polymer processing. Good quality products are usually obtained and major post-processing is not required. However, residual stresses which exist in plastic parts after ejection affect the final shape and mechanical properties. Residual stresses are caused by polymer melt flow, pressure distribution, non-uniform temperature field, and density distribution. Residual stresses are predicted in this study by numerical methods using Hypermesh™, Moldflow™ and ABAQUS™. Residual stresses are measured by two methods, the Layer removal and Hole drilling method, but in this paper, we use hole drilling method because automotive part has complex shapes. We have presented that Hole drilling method is applicable to measure residual stresses. Residual stress distribution predicted by the thermal stress analysis is compared with the measuremental results obtained by Hole drilling method. And then we can verify them though 3D Scanning datum.
인터넷신문 수용 행태 비교 연구 : The Technology Acceptance Model을 중심으로
강호수,김채환 동명정보대학교 2000 東明情報大學校論文集 Vol.3 No.-
The purpose of this study is to predict the adoption of online newspaper through the comparison of online newspaper Reader and Non-online newspaper reader. The Technology Acceptance Model(TAM) was compared and used to predict intentions to adopt online newspaper. On the basis of TAM, the following question is derived to explain and predict the adoption of online newspaper for online newspaper Reader and Non-online newspaper reader. The questions are as follows: [Research Question] How well do the Theory of Reasoned Action, Theory of Planned Behavior, and Technology Acceptance Model explain the decisions to adopt online newspaper? [Research Question 1] Is there any difference between online newspaper users and non-users? [Research Question 2] Is there any difference between online newspaper users and non-users in behavioral intention willing to accept online newspaper? [Research Question 2-1] Is there any difference between online newspaper users and non-users in behavioral intention willing to use online newspaper? [Research Question 2-2] Is there any difference between online newspaper users and non-users in the attitude and usability comprising the intention of willing to accept online newspaper? For method, the questionnaire responded by the participants were analyzed. The participants were recruited from 361 undergraduate students. Each of the previously stated hypotheses was tested using multiple regression. For this study, the indicators are discrete. All of the items were scored on a 3 to +3 scale except for the motivation to comply items, which were scored on a 1 to 7 scale. This study showed the following conclusions. First, both of online newspaper users and non-users are well cognizant of the advantage of decreasing time to search informations. This can be seen in the attitude of the planning behavior theory about online newspaper and the usability of the Technology Acceptance Model in common. Connecting speed is considered as hindering factor. Second, according to the Technology Acceptance Model, usability and easiness have more predictability and more appeal to online newspaper users than non-users. Third, usability of online newspaper is more important factor than individual attitudes, social effects and barriers to use internet in accpeting online newspaper. Considering online newspaper as usable, the attitudes of online newspaper users get more positive. Moreover, Online newspaper users are more conscious of usability and easiness of using online newspaper than non-users. In conclusion, strong support was found for the Technology Acceptance Model as an explanation of the process by which Non-online newspaper readers to adopt online newspaper. As with all empirical research, there exist some potential limitations. First, the relatively restrictive sampling(i.e.) undergraduate students) is a limitation of this study even though there is not necessary to consider demographic factors. The common method variance is also a limitation of this study. Since all of the data were collected from self-reports of Non-online newspaper readers, the potential for inflated correlation is high. However, the tests were performed for each of the theories to determine the unique contribution of each independent variable to dependent variable.