• Proceedings of the Korea Information Processing Society Conference
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• 2005.05a
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• pp.129-132
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• 2005

RFID 시스템에서 태그의 위치를 추적하기 위해서 궤적은 모델링되고 색인되어야 한다. 궤적은 태그가 판독기의 인식영역으로 들어갈 때와 나갈 때 보고되는 두개의 시공간 위치를 연결한 선분으로 표현될 수 있다. 만약 태그가 판독기의 인식영역에 들어와 나가지 않으면 시공간 위치는 오직 태그가 인식영역에 들어올 때만 보고된다. 따라서 판독기에 머물고 있는 태그는 궤적을 표현할 수가 없으므로 질의 시 이러한 태그를 검색할 수 없다. 이러한 문제를 해결하기 위하여 이 논문에서는 태그의 궤적을 시간 매개변수 간격으로 정의한다. 시간 매개변수 간격은 시간에 따라 시간 축길이가 변하는 시간에 종속적인 선분으로 판독기에 머무는 객체의 궤적을 표현할 수 있다. 또한 RFID 시스템에서 사용되는 질의를 분류하고 효율적인 처리를 위해 태그의 식별자를 차원에 추가하는 방법을 제안한다.

• Management & Information Systems Review
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• v.35 no.1
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• pp.1-22
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• 2016

The increased number of foreigners in Korea (now more than 1.8 million) has necessitated understanding, analyzing and interpreting the immigration issues in order to solve the foreign workers' social problems. Foreign workers in Korea are suffering from a lot of difficulties such as bad working conditions, lower income, unpaid wages, cultural adaptation, etc. This paper aims to investigate how the social capital factors (social network and social support) and media use (Korean and Chinese media) influence cultural adaptation and job satisfaction. In addition, the paper aims to provide practical guidelines for social welfare organizations and enterprises which support and recruit them. The sample of our respondents was 273 Chinese workers (216 Korean-Chinese workers and 57 Han-Chinese workers) in Korea. We used SPSS 21.0 for statistical analysis. The results are as follows: Korean network, native network, family support, native support and Korean media use have a significant effect on cultural adaptation. Korean network, native network, family support, native support and Korean media use have a significant impact on job satisfaction. Furthermore, cultural adaptation was found to mediate the relationship between Korean/native network and job satisfaction as well as between family/native support and job satisfaction. Cultural adaptation was also found to mediate the relationship between Korean media use and job satisfaction.

• Journal of the Korean Data and Information Science Society
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• v.26 no.2
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• pp.335-346
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• 2015

The purpose of this study is to compare not only network influence of individual coauthor but also the types and properties of two coauthor networks of Communications for Statistical Applications and Methods and the Korean Journal of Applied Statistics which are published by the Korean Statistical Society using social network analysis.As the result of two network structure comparison, density, inclusiveness, reciprocity and clustering coefficient which represent the type of coauthor networks show almost similar values and the Korean Journal of Applied Statistics has bigger values in average degree, average distance and diameter because it has more nodes than Communications for Statistical Applications and Methods. Finally two journals have very similar type of coauthor network. In the comparison of network centrality of two coauthor networks, closeness centrality and betweenness centrality of the Korean Journal of Applied Statistics are bigger than those of Communications for Statistical Applications and Methods at the statistical significance level 0.05. The coauthor network of the Korean Journal of Applied Statistics has faster information delivery and stronger betweenness than that of Communications for Statistical Applications.

• Proceedings of the Korean Society of Computer Information Conference
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• 2019.07a
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• pp.247-248
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• 2019

본 논문에서는 블루투스 비콘을 이용해 고소 작업장 등의 위험지역에서 작업자 추적 및 확인과 안전 벨트고리를 체결했는지 여부와 작업자의 행동에 따른 데이터를 추가로 수집하여 작업자의 행동 패턴을 분석하였다. IoT 국제 표준인 oneM2M을 기반으로 IoT Device와 Application을 연결하는 중간 매개체로 모비우스 플랫폼을 사용해 시스템을 구축하였다. 또한, 본 연구팀의 선행 연구에서 작업자 위험 행동분류 시스템을 개선할 수 있는 연구 결과를 비교하였다.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.12 no.6
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• pp.1022-1025
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• 2008

Session Initiation Protocol (SIP) has become the call control protocol of choice for Voice over IP (VoIP) networks because of its open and extensible nature. However, the integrity of call signaling between sites is of utmost importance, and SIP is vulnerable to attackers when left unprotected. Currently a herby-hop security model is prevalent, wherein intermediaries forward a request towards the destination user agent sewer (UAS) without a user agent client (UAC) knowing whether or not the intermediary behaved in a trusted manner. This paper presents an integrated security model for SIP-based VoIP network by combining hop-by-hop security and end-to-end security.

• Journal of Korea Society of Industrial Information Systems
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• v.23 no.1
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• pp.65-86
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• 2018

This study focuses on the relationship structure of SMEs with outsourcing based on buyer-supplier relationships and aims to test the role of trust management and mutual growth in the activities of SMEs. Trust management and mutual growth have a context in which the outsourcing type is determined through the company's slack resources, partnership relations, and buyer-supplier relationship. In this context, research hypotheses were set up, research model was designed and an empirical analysis was conducted by using structural equation modeling. For the empirical analysis, hypotheses were tested using data obtained from questionnaires of 206 SMEs nationwide. As a result, trust management and mutual growth have a significant effect on outsourcing type and performance, and mediation effect of cooperation relationship and buyer-supplier relationship was in the process.

• The Journal of Society for e-Business Studies
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• v.18 no.1
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• pp.33-55
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• 2013

Information sharing behavior in the Internet has raised much interest. Recently, social network sites provide a new information sharing channel for the users who want to connect with others based on common social background or tastes. Especially, we focus that a social network site becomes one of major routes for information sharing about socially influential issues. Therefore, studying how information is diffused via a social network site may give theoretically, practically significant implication. Based on the assertion, we investigated user's behavior to mediate other user's information messages. We define information mediating behavior as concurrent actions of filtering and distributing behavior of the digital content that is originated from one of the connected users. In this study, we intended to understand the effects of information mediating behavior, and tried to understand characteristics of re-mediating of previously mediated information. Using an agent-based simulation model, we found that information mediating behavior increased the extent of information diffusion significantly. In addition, even a small degree of mediating probability could boost up the level of information diffusion in the case of a re-mediating condition. We believe that those findings provide remarkable insight of research and business application on both of information sharing and diffusion in a social network site.

• Informatization Policy
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• v.21 no.4
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• pp.40-58
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• 2014

This study investigated how online information affected consumers' purchases at social commerce websites. In the online purchase process, consumers use two types of online information: user generated content(UGC) and vendor generated content(VGC). These information types may influence consumers'purchase intention differently because each information builds entity trust and content trust, which play mediation roles between online information and purchase intention. According to the analysis results, general transactional information and safe transaction information of VGC and reputation information of UGC significantly affected entity trust. But content trust was affected only from general transactional information of VGC. And entity trust significantly affected content trust as well as purchase intention. These findings imply that social commerce vendors should focus mainly on entity trust for enhancing consumers' purchase intention. To achieve this objective, in the short term perspective, they should endeavor how to enhance general transaction information and safe transaction information qualities because these information types are easily controlled and improved by vendors. In the long term perspective, they should focus on reputation formation because reputation takes long time.

• Journal of the Korea Society of Computer and Information
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• v.17 no.2
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• pp.69-76
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• 2012

The purpose of the study is to identify the relationship among the variables related learner's satisfaction, flow experience and self-directedness and verify the path model of causal relationship among those variables in web based computer e-learning. Based on the theoretical rationale, we hypothesized the path model including learner's satisfaction as outcome variable, flow experience and self-directedness as causal and mediating variables. A total of 193 students were participated in this study and the main results showed as follows: 1. Learner's self-directedness showed significant (p<.01), indirect effect on learner's satisfaction mediated by flow experience and the flow experience showed significant (p<.01), direct effect on learner's satisfaction; 2. Among 7 constructs of self-directedness, 'creative approach', 'love of learning', 'self-confidence as a learner' showed significant (p<.01), indirect effects on learner's satisfaction mediated by 'clear goals' construct among flow experience.

• Journal of The Korean Association of Information Education
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• v.25 no.3
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• pp.579-590
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• 2021

This study examined the mediating effect of learning engagement in the relationship between self-regulation, teaching presence and computational thinking in online SW education. To verify the research problem, a blended learning model adopted SW liberal course at A Women's University located in Seoul, which 94 students were enrolled in, was selected. The results of this study and the implications are as follows: First, it was found that learning engagement mediated the relationship between self-regulation and computational thinking. Second, it was found that learning engagement mediated the relationship between teaching presence and computational thinking. This study suggested a plan to improve learners' active engagement and self-regulation strategy in online SW education. In addition, it is significant that this study considered a method for learners to perceive teaching presence in online learning environment.