• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2001.11a
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• pp.173-178
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• 2001

부분구조 합성법(substructuring or substructure synthesis)은 부분구조(substructure)의 주파수 응답함수(FRFs, frequency response functions)를 이용하여 합성된 전체 구조물의 동특성(dynamic behavior)을 파악하는 기술로서 이에 관한 이론은 명확하며 간단하다. 즉, 역행렬 계산과 같은 기본적인 행렬연산으로 부분구조 합성을 수행한다. 그러나, 여러 가지 요인으로 인하여 계산된 합성 결과는 실제로 결합된 전체 구조물의 동특성과는 차이를 보인다. 현실적인 이유로 고려하지 못하는 회전자유도와 실험에서 수반되는 여러 가지 측정오차는 주요한 요인이며 이에 대한 연구 또한 많이 진행되었다. 본 연구에서는 이러한 요인 중, 상대적으로 덜 중요하게 평가된 모드자름 오차(modal truncation error)의 영향을 고려한다. 단순한 구조물에 대하여 모의실험을 수행함으로써, 모드자름 오차로 인하여 완전히 잘못된 합성 결과가 나을 수 있다는 것을 보인다. 측정된 FRE를 이용하여 이러한 오차를 보정(compensation)하는 소개하고 이를 대상 구조물에 적용하여 모드자름 오차의 영향을 상당히 줄일 수 있다는 것을 보인다. 복잡한(complicated) 구조물에 대하여 모드자름 오차의 영향을 줄이기 위해서 모든 FRFs를 보정하는 것은 어려우므로 현실적인 대안을 모색한다.

• Korean Security Journal
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• no.28
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• pp.57-77
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• 2011

Recently, property and life loss is increasing internally and externally, due to fire spread in high-rise buildings which results from a variety of disasters like fire and terror. In this study, therefore, an evacuation simulation was performed to predict escape behaviors of occupants and assess escape safety in high-rise office buildings after setting up each scenario, as part of safety measures for high-rise buildings. Based on the results and data obtained, escape safety was assessed, finally. The results and suggestions of this study are as follows. Firstly, most of the present researches on high-rise building and multiple-use facilities are weighted towards qualitative perspectives. It is, therefore, considered that we have to establish concrete, practical, systematical and rational safety measures to minimize damages in dangerous situations, by analyzing security plans for high-rise buildings in depth and preparing for those situations from various angles. Secondly, setting up evacuation sections in security plans for high-rise buildings is an important factor which influences refuge. Thirdly, in relation to security plans for high-rise buildings, it is possible to reduce the entire time for escape, by setting up escape exits of each floor in consideration of a simultaneous evacuation situation.

• Journal of Korea Entertainment Industry Association
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• v.15 no.3
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• pp.141-152
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• 2021

The purpose of this study is to examine the effects of screen baseball experience factor on pleasrue, experience value and quality of life based on experience economy theory. To achieve the purpose of the study, 366 questionnaires who had experience visiting screen baseball were surveyed. Frequency analysis, factor analysis, reliability analysis, correlation analysis, Multiple regression analysis using SPSS ver 21.0. Results of this study are as follows, First, Experience factors (entertainment experience, escapist experience) were found to have a significant effect on the pleasure. Second, Experience factors(entertainment experience, escapist experience and aesthetic experience) were found to have a significant effect on the experience value. Third, Experience factors(entertainment experience, educational experience and escapist experience) were found to have a significant effect on the quality of life. Through these study results, this suggests that the experience factors of screen baseball users positively influence the pleasure, experience value and quality of life. Therefore, it is necessary to develop an experience factor reinforcement program and expand facilities in order to increase the pleasure, experience value, and quality of life of screen baseball users in the future.

• Convergence Security Journal
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• v.18 no.2
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• pp.159-166
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• 2018

The purpose of this study is to investigate the effect of selection motivation on the NCS curriculum and career decision of the students in security related department. The contents of the questionnaire consisted of "First, Motivation to select major, Second, NCS curriculum, Third, Career decision". In this study, Chronbach's Alpha coefficients were presented to analyze the reliability of variables and exploratory factors, and the Berimax method was performed. The AVE and CR values of the items were calculated to be 0.5 and 0.7, respectively. Therefore, it was analyzed that the Intensive feasibility of items were well-focused. As a result of the hypothesis test, the standardized coefficients were calculated as follows: 'Selective motivation ⇨ NCS curriculum' is 0.563, 'NCS curriculum ⇨ career decision' is 1.339. The relationship between the two hypotheses was found to be positive (+). In order to improve the career decision of students in security related departments, it seems necessary to raise the motivation of selection and to improve the satisfaction of NCS curriculum.

• Proceedings of the Korea Information Processing Society Conference
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• 2008.11a
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• pp.699-701
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• 2008

최근 들어 경제 운전 및 친환경 운전 즉 에코 드라이빙에 대한 관심과 필요성이 사회적 이슈로 등장하였다. 에코 드라이빙을 위한 요인 중 가장 중요한 요인은 바로 운전자의 운전 성향이다. 본 논문에서는 에코 드라이빙을 위한 운전자의 운전성향분석을 위한 주요 요소들을 도출하고 이를 이용하여 에코 지수(Eco Index)를 산출하는 방법에 대하여 기술한다. 에코지수는 주행중인 차량으로부터 실시간으로 주행 정보를 수집한 후 이를 분석하여 계산되고 차량에 장착된 단말기를 통하여 운전자의 경제운전 및 친환경 운전 성향이 제공되며 서버로 전송되어 운전자의 장기적인 운전 성향 분석에도 사용된다.

• Journal of Satellite, Information and Communications
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• v.10 no.2
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• pp.40-45
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• 2015

In this paper, we proposed and implemented a crime prediction algorithm based upon crime influential factors. To collect the crime-related big data, we used a data which had been collected and was published in the supreme prosecutors' office. The algorithm analyzed various crime patterns in Seoul from 2011 to 2013 using the spatial statistics analysis. Also, for the crime prediction algorithm, we adopted a Bayesian network. The Bayesian network consist of various spatial, populational and social characteristics. In addition, for the more precise prediction, we also considered date, time, and weather factors. As the result of the proposed algorithm, we could figure out the different crime patterns in Seoul, and confirmed the prediction accuracy of the proposed algorithm.

• Korean Security Journal
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• no.10
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• pp.15-34
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• 2005

1. There was significant relationship between personality traits and coping behavior. (1) Type A Group used more problem-focused and emotion-focused coping style than Type B Group (2) Non-sociable group used more emotion-focused coping style especially 'escape-avoidance' behavior than sociable group (3) Emotionally unstable group used more emotion-focused coping style especially 'distancing' and 'escape-avoidance behavior than stable group. 2. There was no significant relationship between personality traits and stress coping effect except emotional stability. 3. There was same inter-correlations among personality, coping style, and coping effect, (1) Type A was significantly correlated with sociability but not with emotional stability. (2) Problem-focused coping style was positively correlated with emotion-focused coping style. (3) Coping effect was not significantly correlated with coping style and personality traits accept emotional stability. 4. There was significant relationship between cognitive appraisal and coping style. (1) When they appraised the event 'could change or did something about it,' that used more problem-focused coping style than appraised 'had to accept.' (2) When they appraised the event ' could control before it occures.' they used more problem-focused and emotion-focused coping style than appraised it 'could not control'. (3) When they appraised the event 'had to gold back.' they used more problem-focused and emotion-focused coping style than appraised it 'had not to hold back.' (4) When they appraised the event 'happened by me.' they used more problem-focused coping style than appraised it 'happened by others.' (5) When they appraised the event 'needed to know more, 'they did not significantly use more coping behavior than appraised it 'needed not to know more.' 5. There was no significant difference except two cases in cognitive appraisal to the problem according to the personality. The two cases were as follows: (1) Sociability group appraised the event 'had to accept.' while non-sociability group appraised it 'could change or did some thing about.' (2) Emotionally stable group appraised the event 'happened by others.' while emotionally unstable group appraised it "happened by me".

• Korean Security Journal
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• no.47
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• pp.61-84
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• 2016

The objective of this study is to closely examine the relationship between intrinsic extrinsic job satisfaction and organizational citizenship behavior and closely examine a moderation effect that job characteristic variable has, focusing on workers in private security guard industry. In order to attain the above-mentioned objectives, a purposive sampling method was used as sampling method. Data on 207 people were used for analysis. A frequency analysis, correlation analysis, reliability analysis, structural equation model analysis, multiple group analysis of the collected data was made by utilizing SPSS 21.0 and AMOS 22.0. The results of study can be summarized as follows. First, it was shown that intrinsic satisfaction, sub-factor of intrinsic extrinsic job satisfaction, had a positive (+) effect on altruism. Second, it was shown that intrinsic satisfaction had a positive (+) effect on conscientiousness. Third, it was shown that intrinsic satisfaction had a positive (+) effect on participation. Fourth, it was shown that extrinsic satisfaction didn't have significant effect on altruism. Fifth, it was shown that extrinsic satisfaction didn't have significant effect on conscientiousness. Sixth, it was shown that extrinsic satisfaction didn't have significant effect on participation. Seventh, it was shown that skill variety had a moderation effect on the relationship which intrinsic satisfaction had with altruism and participation. Eighth, it was shown that task identify had a moderation effect on the relationship which intrinsic satisfaction had with altruism and participation. Ninth, it was shown that task significance had a moderation effect on the relationship which intrinsic satisfaction had with altruism, conscientiousness and participation.

• Korean Security Journal
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• no.30
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• pp.7-32
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• 2012

Korea faces The 2014 Incheon Asian Games and 2018 Pyungchang Winter Olympics. It is imperative to hold a safe event for the economic benefits, enhancing Korea's image, social integration, national harmony and unity in order to be evaluated as a successful international event. Furthermore, since the international event tends to draw many spectators, the host country must be ready to accommodate a large number of injured people in the event of an accident or terror attack. As stadiums for international events are where a large number of spectators gather in, a large refuge is essential, when dangerous situations happen. In this study, evacuation simulation was conducted using three scenarios in order to predict escape behaviors of spectators during the large escape by destruction of safety systems of stadiums and assess escape safety. As the result, the following results and proposals were extracted. Firstly, it is considered that dangerous situations during the security of stadiums should be predicted in advance and concrete plans for a large refuge of spectators have to be established to minimize damage. Secondly, it was found that the reduction in evacuation exits has an important impact on evacuation in an emergency situation. It implies that securing escape exits are quite important. Thirdly, there were areas where spectators stayed, due to blocked escape exits, while they were dispersed and concentrated at once. It demonstrates that security plans considering properties of facilities are required to solve these problems.

• Convergence Security Journal
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• v.14 no.1
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• pp.59-69
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• 2014

The purpose of this study is to investigate an effect of the department satisfaction of college students majoring in security on the career expectation consciousness, and through this to propose basic data to help college students prepare positive school life and career and increase school life adaptation; doing this, it is to investigate the cause to promote not only their development but also school development. As of 2013, I set up a population targeting female and male college students majoring in security at Y University located in Y City, Gyeonggi Province, K University in G City, North Gyeongsang Province, and H University in C City, South Chungcheong Province and conducted study targeting the total 352 students using the random sampling method. The research tool was questionnaires, which I used by recomposing on the basis of the precedent studies at home and abroad. Regarding data processing, I used SPSS WIN 18.0 and carried out frequency analysis, one-way analysis of duncan variance, post hoc analysis, reliability analysis, factorial analysis, correlation analysis and multiple regression analysis. Through the above research methods and data analysis according to the procedures I drew conclusions as follows: First, the department satisfaction according to demographic characteristics of the college students majoring in security had a partially significant difference. Second, the career expectation according to demographic characteristics of the college students majoring in security had a partially significant difference. Third, the effect of the department satisfaction of the college students majoring in security on the career expectation consciousness was partial.