• Journal of Digital Convergence
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• v.8 no.3
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• pp.115-127
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• 2010

This study investigates the effect of E-learning service quality toward users' learning satisfactions when moderating by users' study motivations at cyber universities. For this end, the E-learning service quality was measured with SERVQUAL which was widely employed in academic research area. From rich survey analysis, this study finds that the three factors of E-learning service quality such as concreteness, certainty, credibility and sympathy are statistically correlated with users' learning satisfactions, but the responsiveness is not. Also in order to test the hypothesis that the study motivation is a moderate variable, the three step regression analysis was applied. Finally, this research finds that the study motivation has the role of moderate variable to affect the users' learning satisfactions.

• Proceedings of the KIEE Conference
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• 2015.07a
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• pp.1637-1638
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• 2015

최근 환경문제와 더불어 새로운 에너지 패러다임의 변화에 따라 국내 외적으로 효율적인 수요관리의 수단과 신재생에너지원을 기반으로 하는 스마트그리드의 핵심 요소로서 전기저장장치가 주목받고 있다. 현재는 전기저장장치의 보급이 시장 형성전의 실증단계이지만 향후 신재생에너지의 확대와 전력 수요관리를 위한 보급 정책에 따라 수요가 빠르게 증가할 것으로 예상된다. 그러나 전기저장장치에 대한 시설기준의 부재로 인하여 설비의 설계 및 시공에 있어 안전성 및 신뢰성 확보가 어려우며 법정 검사의 사각지대에 있는 실정이다. 특히, 이차전지를 이용한 전기저장장치의 경우 축전지의 전기화학적 특성에 따라 안전을 확보하기 위한 특별한 시설기준이 요구된다. 따라서, 전기사업법에 의한 전기설비기술기준에 전기저저장치의 시설에 대한 최소한의 안전요건을 규정하는 시설기준을 제정함으로서 인체의 안전과 설비의 신뢰성을 확보하는 것이 필요하다.

• Journal of Korean Society of Environmental Engineers
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• v.36 no.4
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• pp.271-276
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• 2014

The purpose of this study was to survey Suwon citizens over the age of 20 in order to provide basic data on the extent of coverage of the city's water reclamation system and to set guidelines for a policy on water reuse. The survey used a questionnaire with two fields, rainwater use and wastewater recycling, for analyzing factors that influenced water reuse. A factor analysis of 19 questionnaires gave a Cronbach's alpha coefficient greater than 0.4. Factors that influenced rainwater use were environmental protection, water charges, and the risk of climate change. Of the total explanatory power, the share of rainwater use and environmental protection was 39.7% and 28.1% respectively. Environmental protection (explanatory power 24.2%) had an effect on the explanatory power of wastewater reuse. When factors influencing wastewater recycling, like cost of recycling, water management policy, climate change, and suspension of tap water supply were included, the explanatory power of each of these factors went up by 4.3%, 2.8%, 3.3%, and 1.1%, respectively. For more effective wastewater recycling, a water management policy that factors in the above is required, along with a campaign to educate citizens on water management and environment conservation. Additionally, it may be necessary to improve the reliability and the quality of water supply.

• Journal of Digital Convergence
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• v.11 no.12
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• pp.319-326
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• 2013

There are many software reliability models that are based on the times of occurrences of errors in the debugging of software. Software error detection techniques known in advance, but influencing factors for considering the errors found automatically and learning factors, by prior experience, to find precisely the error factor setting up the testing manager are presented comparing the problem. It is shown that it is possible to do asymptotic likelihood inference for software reliability models based on infinite failure model and non-homogeneous Poisson Processes (NHPP). Statistical process control (SPC) can monitor the forecasting of software failure and thereby contribute significantly to the improvement of software reliability. Control charts are widely used for software process control in the software industry. In this paper, we proposed a control mechanism based on NHPP using mean value function of logarithmic hazard learning effects property.

• Journal of Digital Convergence
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• v.14 no.10
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• pp.183-193
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• 2016

Recently, collaborations through MCS use in team projects are frequently conducted. This study developed a research model to examine the impact of collaboration through MCS on project performance. Team commitment and team trust regarded as the key drivers of enhancing project performance. Moreover, we also investigated the effect of usefulness of MCS on project performance. We posit ubiquity, polychronic use, and ease of use as the key antecedents of usefulness of MCS. The proposed theoretical framework was tested by using survey data collected from 116 university students who have rich experience with collaboration through MCS. PLS was employed for the analysis of the data. The analysis results showed that team trust significantly influences team commitment and project performance, respectively. However, usefulness of MCS is not significantly related to team commitment, while it play a prominent role in enhancing project performance. The results reveals that ease of use has a significant effect on usefulness of MCS, whereas ubiquity and polychronic use are not significantly related to it. From theoretical and practical perspective, this paper can provide in-depth knowledge of the effects of collaboration via MCS on project performance.

• Journal of Digital Convergence
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• v.12 no.12
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• pp.277-284
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• 2014

The NHPP software reliability models for failure analysis can have, in the literature, exhibit either constant, monotonic increasing or monotonic decreasing failure occurrence rates per fault. In this paper, finite failure NHPP models that assuming the expected value of the defect and infinite failures NHPP models that repairing software failure point in time reflects the situation, were presented for comparing property. Commonly used in the field of software reliability based on Rayleigh distribution software reliability model finite failures and infinite failures were presented for comparison problem. As a result, infinite fault model is effectively finite fault models, respectively. The parameters estimation using maximum likelihood estimation was conducted. In this research, can be able to help software developers for considering software failure property some extent.

• Journal of the Korea Society of Computer and Information
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• v.15 no.2
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• pp.189-197
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• 2010

This study positively analysed the effects of service qualities of workers in integrated social welfare facilities on their working attitudes, targeting those who work for the welfare facilities. It identified the effects of service qualities such as tangibility, reliability, responsiveness, assurance, and sympathy on relationship factors such as relationship closeness through customization, organizational immersion and job satisfaction and presents suggestions to improve working attitudes of the workers. The results of the study are presented as follows: Reliability, responsiveness and assurance, service qualities of the workers, had effects on working attitudes. Relationship closeness through customization had an effect on organizational immersion and job satisfaction. Therefore, reliability, responsiveness and assurance that had effects on working attitudes of the workers were very significant factors and relationship closeness through customization were significant factors to improve working attitudes of the workers. This study presents political suggestions on the relations between service qualities of the workers in the welfare facilities and their working attitudes as alternatives.

• Journal of Digital Convergence
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• v.12 no.3
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• pp.219-226
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• 2014

In this study, reliability software cost model considering shape parameter based on life distribution from the process of software product testing was studied. The shape parameter using the Erlang and Log-logistic model that is widely used in the field of reliability problems presented. The software failure model was used finite failure non-homogeneous Poisson process model, the parameters estimation using maximum likelihood estimation was conducted. In comparison result of software cost model based on the Erlang distribution and the log-logistic distribution software cost model, because Erlang model is to predict the optimal release time can be software, but the log-logistic model to predict to optimal release time can not be, Erlang distribution than the log-logistic distribution appears to be effective. In this research, software developers to identify software development cost some extent be able to help is considered.

• Journal of Korea Port Economic Association
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• v.30 no.4
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• pp.169-198
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• 2014

Due to the recent worldwide economic downturn, companies are required to put more effort into their innovation and quality improvement. In particular, business relationship is increasingly emphasized to be changed from a vertical relationship to a more horizontal relationship, such as collaborative partnership based on trust. In the logistics industry, through the collaboration, consignors can gain competitive advantages by focusing on their core capabilities, and freight forwarders also take advantages of securing stable cargoes and specialist expertise in distribution. Therefore, this study aims to identify key factors for developing a collaborative partnership between freight forwarders and consignors, and further examine the differences between the two groups empirically by using questionnaire survey. Based on the results, the main factors were found as follows: 1) Trust Building, 2) Competence Improvement, 3) Business Ecosystem and 4) Government Assistance. According to the analysis on sub-factors, first, among the four main factors, it turned out that trust is the most important variable. Specifically, the sub-factor of providing regular and stable service was revealed to be most critical. Second, it was found that forwarders need to improve services on 'Information Exchange System' and 'Electronic Data Interchange'. Finally, it is necessary for both consignors and forwarders to have better understanding of partnership. Key implications for both groups are highlighted based on the results.

• Information and Communications Magazine
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• v.27 no.1
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• pp.28-34
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• 2009

인터넷의 진화에 따라 우리사회는 매우 빠르게 변화하고 있으며, 이러한 변화를 선도한 인터넷은 앞으로도 개인 맞춤형, 사물 지능화 등으로 진화를 거듭하여 우리 삶에 더욱 큰 변화를 가져올 것이다. 경제적 측면에서도 인터넷을 기반으로 한 다양한 형태의 융합이 산업발전의 새로운 패러다임으로 대두되어 전력, 교통 등 산업간 융합이 가속화되고, 첨단 융합보안기술로 고(高)부가가치 신규 시장의 창출이 가능해질 전망이다. 그러나 인터넷, IT의 발전과 더불어 사이버 공격의 특성이 과거 호기심이나 자기 과시적 행태에서 조직적이고 금전적인 이익을 노리는 방향으로 확산되고 있으며, 인터넷의 익명성과 비대면성으로 인해 불건전 정보의 유통, 저작권 침해, 명예 훼손, 언어폭력 등 개인과 사회의 피해가 점증하고 있는 상황이다. 본고에서는 이러한 환경변화에 맞추어 융합을 통한 가치 창조적 정책 및 선진 인터넷 기반마련, 깨끗하고 안전한 인터넷 이용환경 조성, 글로벌 협력체계 강화 등의 전략 목표 달성을 통해 신뢰할 수 있는 인터넷 및 방송통신융합의 가치창조와 진흥이라는 미션을 완수하기 위한 한국인터넷진흥원의 주요 중점 추진과제를 정리하였다.