• Journal of the Korean Operations Research and Management Science Society
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• v.31 no.3
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• pp.127-143
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• 2006

While e-learners' satisfaction would be determined by qualify of e-learning environment including learning management systems, learning contents and interactions, the influence of quality on satisfaction can be changed by e-learners' self-regulated efficacy The objective of this study is to show difference of the relationship between qualify and satisfaction In e-learning by self-regulated efficacy. For this purpose, we propose a research model which consists of five quality factors in e-learning as explaining variables, satisfaction as a result variable and self-regulated efficacy as a control variable. For empirical test of this model, the sample is collected from e-learning classes in a college and divided into two groups by self-regulated efficacy in order to analyze the effects of control variable. By multi-group analysis, we show two groups are different from each other in the relationship between quality and satisfaction of e-learning environment.

• Proceedings of the Korea Society of Information Technology Applications Conference
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• 2005.11a
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• pp.305-310
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• 2005

Recently, many organizations in various industries have introduced e-businesses for the purpose of adding value to their businesses. However, due to no comparable business models to e-business in the past, there are no reliable yardsticks to predict the performance of an e-business. This paper considers an environmental change analysis as a means to resolve this difficulty. System Dynamics (SD) could be a useful tool to generate effective results by examining the e-business model. SD model is developed to analyze the effects of an e-sales channel which was appended to the existing sales channels in the steel manufacturing industry. The results show an increase in average price and sales volume through the use of an auction process on the e-marketplace. Stocking expenses are reduced as well by the increase of the sales turnover. A possible scenario was adopted to the developed simulation model and investigated strategic issues to draw desirable strategies with market changes.

• International Commerce and Information Review
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• v.9 no.2
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• pp.231-253
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• 2007

This paper intends to develop an performance evaluation framework of e-trade. The Korea e-trade has been largely attracting many research communities because it brings about e-trade platform which is happening at the early stage of information system maturity. It is true that many research works have been focusing on development issues in e-trade but not much works have been done in e-trade performance study. This paper suggests an e-trade performance framework based on both field and literatures surveys. In addition, an factor analysis model has been introduced to determine that the suggested factors are empirically supporting the hypotheses in the model. Since this paper is opening up many research issues in e-trade performance study many research group could participate in this research area.

• The Transactions of the Korea Information Processing Society
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• v.4 no.7
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• pp.1665-1680
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• 1997

The Entity-Relationship (E-R) model is widely used not only to increase understanding between user and designer, but also to model the relationship of real world data appropriately when designing database system in many application areas. It should be then transformed into an Object-Oriented database model which gives good merits to represent and manipulate data efficiently. Therefore, a method of transforming an E-R model into an Object-Oriented database model should be studied, but without losing any semantics of concept for the E-R model. This paper not only deals with transformation rules taking as input the elements of E-R model and delivering the elements of an Object-Oriented database model, but also improves the concept of generalization and aggregation inheritance. The paper also presents a method of transformation of relationship depending on these rules. The proposed method that obtains Object-Oriented database schema from an E-R model with preserving the properties of the E-R model is shown with examples. The method presented is able to be used to the logical database design.

• Knowledge Management Research
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• v.9 no.4
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• pp.35-49
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• 2008

The purpose of the study is to develop and validate an instructional design model from the perspective of the knowledge creation. To serve the purpose, the researcher conducted 1) literature review to find causal relationship model among knowledge creation factors and to propose a hypothetical instructional design model, 2) data analysis with 50 senior level e-Learning instructional designers, and 3) testing the fitness of the proposed model and relevant causal-relational hypotheses. Results indicate; 1) the proposed model fit to the empirical evidence, 2) 6 hypotheses among 11 were validated. A typical instructional designer's personal competency was evidenced as the most powerful independent variable that predicted knowledge acquisition, knowledge sharing, and the application of the instructional models. However, the expected effect of instructional design models toward other dependent variable was not be found. In addition, further suggestions for the future research are addressed.

• Journal of Korean Society on Water Environment
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• v.25 no.5
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• pp.651-660
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• 2009

Detailed flow analysis in river is essential to increase the accuracy of water quality simulation since flow variation depends on many factors such as cross sections, channel slopes, and bed materials. In the QUAL2E stream water quality simulation model, the hydraulic coefficients are assigned to the reach that is collection of computational element using the hydraulic coefficient. This study developed a module that can incorporate the results of non-uniform flow analysis and assign such information to each individual element. Model application focused on the upstream of the Hoengseong reservoir including the reservoir where significant flow change is expected. Comparing with original QUAL2E model the developed module improved the result of water quality simulation without considering the relation of flow velocity and flow depth in terms of flow rates.

• 한국정보통신설비학회:학술대회논문집
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• 2003.08a
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• pp.106-111
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• 2003

인터넷망에서 IP전화의 요구가 강하게 대두되고 있는 시점에, 사용자들의 통화품질 욕구를 만족시키고, 서비스 제공업자들의 업무에 이용될 수 있는 QoS 측정방법이 꾸준히 연구되고 있다. 전통적인 회선교환 전화망에 적용되던 몇 가지 측정도구들 중에서 ITU-T G.107의 E-model은 요즈음의 VoIP망에서도 적용할 수 있다. VoIP의 통화 방법에는 기존 PSTN 전화와 인터넷 PC전화의 혼용이 가능한데, PC사용자들 간에도 전화 통화할 수 있도록 한다는 기조 하에 E-model의 적용성을 고찰해 본다. 기존 전화망에서 고려되던 여러 가지 파라미터 외에 인터넷 망에서 나타나는 지연변동, 패킷손실 등의 파라미터와 인터넷 전화 단말의 영향을 포함하여 E-model을 분석해 보고 문제점들을 고찰한다.

• Journal of The Institute of Information and Telecommunication Facilities Engineering
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• v.2 no.3
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• pp.72-82
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• 2003

인터넷의 사용이 폭발적으로 증가함으로 인해 다양한 서비스들의 욕구가 있고 그 중에서도 VoIP가 대표적인 예이다. ITU-T의 Study Group12에서 QoS (Quality of Service)에 관한 연구를 진행하고 있다. 그 중에서도 품질평가 방법에서 전송계획을 위한 G,107의 E-model을 PSTN에서 IP네트워크로 적용하는 연구를 진행하고 있다. VoIP의 QoS문제점을 분석하고 E-model에서 개선되어야 할 파라미터들을 확인하고, 이를 위한 ITU-T의 개선동향을 살펴봄으로써 앞으로의 E-model이 나아가야 할 방향에 대해서 기술하였다.

• Journal of Digital Contents Society
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• v.8 no.1
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• pp.61-68
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• 2007

In order to expand e-Learning and to increase effect of e-Learning, e-learning should be improved more and more. It is achived when reflecting learning planning, teaching method design, well-designed operation, etc. The quality of e-Learning can be influenced by the development method and operational method, and the quality of e-learning can decide teaming effect. That is, the development method(model) of contents influence contents quality, and contents quality decides learning effect. Therefore, this study, analyzing e-Learning models and introducing "Knowledge-based e-Learning Model" which can increase quality of e-Learning, should contibute to achieve e-Learning purpose.

• Journal of the Korean Society for Library and Information Science
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• v.46 no.1
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• pp.99-117
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• 2012

Due to the recent technological improvements, the environments of e-books and its contents have been changed and the users of e-books have drastically increased. This study aimed to propose a model on how children access and search e-books in this digital era. For this study, a potential model was proposed based on the analyses on various information-seeking behavior models. For analyzing children's access and search processes on e-books, 30 children in five public libraries or school media centers in Seoul and Kyoungi-do areas were recruited for the in-depth interviews. As a potential model on children's access and search on e-books was re-visited and revised based on the results, a cyclic model of children's access and search on e-books was proposed containing six factors.