• Journal of Korean Society for Atmospheric Environment
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• v.20 no.1
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• pp.17-31
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• 2004

The subway play an important part in serious traffic problems. However, because subway system is a closed environment, many serious air pollution problems occurred in subway stations and injured passenger's health. Therefor, it is a necessary to identify sources and to estimate pollutant sources in order to protect passenger's health and to keep clean subway environment. The purpose of this study was to analyze a air quality in the subway stations and to apply a new receptor methodology for quantitatively estimate of PM10 sources. In this study, the size distributions of particulate matters has been measured by using Aerosizer LD (U.S.A., API, Inc.). It's real time measurement capability of time-of-flight technique offers a significant advantage of user convenience and air pollution management. Also, the mass concentrations of PM 10 has been measured by using mini-vol portable sampler (U.S.A., Airmetrics Co.). The sampling performed in Seoul subway stations during the period of February 2000 and April 2000. The number distribution data used in this study consisted of 26 raw data sets in the Jongno-sam-ga station. Correlation Analysis can be used in subway stations for source separation and identification. Then, number contribution from each source is determined by the particle number balance (PNB). The mass concentration data used in this study consisted of 31 raw data in the 8 different stations. The mass contributions of PM10 sources in the concourse by using PMF/CMB model.

• Journal of the Korean BIBLIA Society for library and Information Science
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• v.24 no.2
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• pp.231-246
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• 2013

This paper attempts to explore the use of social metadata in academic libraries. A total of 173 academic libraries were examined and analyzed. Various social metadata were reviewed, involved with users' participation and contribution. Error-reports, tagging, recommendations, ratings, reviews, comments, sharing, and community were identified that support selection, sharing and collaboration through social engagement. Suggestions drawn from the findings are offered to utilize social metadata in order to enhance users' contribution and interaction. It is hoped that this exploratory study will provide insight into the use of social metadata in academic libraries.

• Knowledge Management Research
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• v.12 no.5
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• pp.25-40
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• 2011

Today, Internet users start off using heavily SNS(Social Network Site) such like, Facebook, Twitter. The reason of the growth of using SNS would be closely related to the various services of gaming, playing, entertainment items, sharing information etc., provided by the SNS, technically, the most important one out of the services provided would be behaving of sharing knowledge among people who connected and networked in the site. In sum, we assume that the users may communicate well each other and pay attention to build closely a social network using that kind of activities. However, nevertheless the new trends of communications and sharing knowledge become popular, researchers have just began the research issues in explaining why Internet user rush into SNS and enjoy the time in there. Therefore, we investigate on the reasons of posting knowledge voluntarily in the SNS and how others response to the posted information and actually affected by the behavior. We appled personal relation and social identity theory for this study, which personal relation in SNS may affect on social identity and make them produce knowledge generation. We found that social identity and involvement in SNS is closely related and influence knowledge creation and generation. This empirical study resulted in the importance of social relations in SNS, which leads to a sharing knowledge.

• Knowledge Management Research
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• v.14 no.2
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• pp.25-48
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• 2013

SNS is one of the fastest service entering in mature stage. But now there are not any empirical analysis the effect of SNS from user point of view. In this paper, we investigate the effect of self presentation on SNS to interpersonal relation and intention to use. we set online presentation self-efficacy and involvement as two antecedent factors. And we suggest that the purposes of using SNS be Image improvement and knowledge contribution. The change of interpersonal relation in offline is set a result of using SNS and a mediating variable between online self-presentation and intention to use. In the results, firstly, we confirmed that the online presentation self-efficacy and involvement are predisposing factors for online self-presentation on SNS in the positive direction. Secondly, the using SNS has significantly positive effect on the change of interpersonal relation. Especially, the improvement of interpersonal relation is originated from image improvement and knowledge contribution. Thirdly, the improvement of interpersonal relation have also significantly more higher effect on the intention of use.

• Journal of Digital Convergence
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• v.10 no.10
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• pp.237-245
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• 2012

This study deals with the influencing factors for satisfaction and the emotional value perception of mobile voucher service user. Thus researcher examined a structural equation modeling methodology of the paths within word of mouth, satisfaction, and other exogenous variables (economic/rational value, trust, joyfulness, innovativeness). As a result of this study, First, it was confirmed that the emotional value, and innovativeness affected user's trust for coupon service and joyfulness for using mobile voucher. Second, it was confirmed that trust and joyfulness affected user's satisfaction and word of mouth activities. Therefore, in cases of utilizing the emotional appeal of mobile voucher as part of a marketing tool, corporate can maximize efficiency by using their mobile voucher service & event from the point of view of customer's satisfaction & voluntary word of mouth. Researcher's consideration is that this paper's theoretical and practical contribution point is the propose of the one of the post adoption model with the quantitative study of the mobile voucher service user's emotional perception in the initial development stages of high-tech industry.

• Journal of the Korea Convergence Society
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• v.11 no.11
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• pp.155-163
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• 2020

This study investigated experimentally how factors of SNS advertising attribute impact on advertising likeability and purchase intention according to use motive and use intensity of SNS. Firstly showing difference according to use motive of SNS, in user of motive to managing human relation, reliability of advertising contents has effect the largest and entertainment of advertising interest has effect also as important factor. In user of motive to sharing interest information, irritation of advertising on using SNS has effect the largest negatively and information of advertising's information offering capability has effect larger as positive factor. Next showing difference according to use intensity of SNS, in user of high intensity, reliability and information of advertising contents has effect larger than other factors. In user of low intensity, irritation of advertising has effect the largest negatively and other factors have effect very small. This results can provide a practical contribution that explains important factors in producing effective SNS advertising according to using behavior characteristics of SNS.

• Journal of Korea Game Society
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• v.15 no.2
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• pp.19-32
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• 2015

Presence, flow, and arousal are interesting user experiences provided by video and people's demand for media which responds to personal interest is getting strong. This research compares video watching and game play by conducting a survey and measuring brain wave to find out the difference of those user experiences in the two media. As a result, all the three user experiences were proved to be significantly higher in game play than video watching. And those EEG frequencies which are known to be related to the state of flow were also measured higher scalp distribution of the game play group. Finally, presence, arousal, and EEG(${\alpha}$, ${\beta}$, ${\delta}$) were found to have influence on the flow state in game play. This research is intended to prove above relations by experiment and make a contribution to the theoretical and methodological improvement in the related area.

• Journal of Digital Contents Society
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• v.13 no.3
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• pp.431-438
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• 2012

Recently, many mobile applications have been developed and published by increasing popularity of smart phone's market. However, a lack of research work is an issue for mobile applications' favoritism to users. In this paper, we have determined the acceptance factors on the existing smart phone applications in order to fit into mobile user's requirements. In addition, we have defined the modification of acceptance factors which are the interesting element of mobile applications, code users reviews of top 20 paid applications among android market applications, and analyse on what element can attract users' interest of mobile applications. As a result, we propose a development method of mobile applications based on the analyzed interesting elements. Our contribution is to provide useful information to mobile application companies for helping them to develop and publish successful mobile applications.

• Journal of Korean Society of Industrial and Systems Engineering
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• v.41 no.3
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• pp.50-60
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• 2018

The use of Project Management Information System (PMIS) is increasing in project management industries such as construction, defense, manufacturing, software development, telecommunication, etc. It is generally known that PMIS helps to improve the quality of decision making in project management, and consequently improves the project performance. However, how much and which parts of project management performance are affected by PMIS still need to be studied further. The purpose of this study is to investigate the impact of PMIS quality on project management performance. We collected data from various project based industries such as construction, defense, manufacturing, software development and telecommunication by using survey questionnaire. PMIS quality was measured in three dimensions. They are system quality, information quality and service quality. Project management performance was measured in nine variables such as time reduction, work accuracy, cost management, etc. Statistical analyses such as multiple regression were used to analyze the data. The results showed that PMIS quality had significant impacts on the project management performance and user satisfaction. It was notable that only two dimensions out of the three PMIS quality dimensions, system quality and information quality, affected the project management performance. Also, it was found that PM performance played a mediating role between PMIS and user satisfaction, and between PMIS and reuse intention. The contribution of this research is that it helps to clarify what aspects of PMIS affect the project management performance and user satisfaction.

• Journal of Digital Contents Society
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• v.13 no.3
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• pp.301-307
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• 2012

This study deals with the influencing factors for satisfaction of mobile coupon service. Thus researcher examined a structural equation modeling methodology of the path within word of mouth, satisfaction, and other exogenous variables (economic value, trust, joyfulness, innovativeness). As a result of this study, mobile coupon users understand the characteristics of basic coupon concept, and First, it was confirmed that the economic value, innovativeness affected user's trust for coupon service and joyfulness for using coupon. Second, it was confirmed that trust and joyfulness affected user's satisfaction and word of mouth activities. Moreover, this paper's contribution point is the proposes of the one of the post adoption model with the quantitative study of the industrial development stages of current various mobile coupon application.