• 전기학회논문지
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• 제59권3호
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• pp.657-663
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• 2010

Today, rapid evolution of Internet makes various types of services in ubiquitous environment are intelligent and active. As a result, user's demand on high quality of life increases and health care service based on ubiquitous environment draws a lot of attention. However, user's private information used for health care service is illegally distributed and exposed, causing serious individual and social problems. Therefore, this thesis is intended to suggest a secure health care service to prevent unauthorized third party's access and to protect user's privacy in health care systems. The proposed scheme establishes a session key through communication channel between health care system and user based on explicit mutual authentication and provides secure communication and access control, improving security as one of the leading health care systems.

• 대한전기학회논문지:전력기술부문A
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• 제53권1호
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• pp.67-72
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• 2004

This paper addresses the bidding strategies of generating firms in a competitive market where the firms are provided with payment for generating reactive power. Reactive support for voltage control is an integral and critical part of power system operations. Since reactive support is unbundled in a competitive market under open access transmission, it is treated as one of ancillary services. The operation costs and opportunity costs for reactive support are compensated by payment to the firms, hence their bidding strategies will be affected. The opportunity costs are evaluated from the foregone profits of a generator in making sales in real power market by providing reactive support instead of real power. Game theory approach is used to analysis the transaction strategies of real power by the bimatrix method in this paper. Through computing the Nash equilibrium in a sample system, an incentive of a generator for improving the reactive generating capacity is found to be effective and the variations of the profits are analyzed as the demand power factor changes.

• International Journal of Knowledge Content Development & Technology
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• 제4권2호
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• pp.5-23
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• 2014

The instant messenger (IM) is frequently encountered as a facilitator of communication in both social and working contexts. Nevertheless, there are concerns about the extent to which IMs bring organizational benefits, thereby overcoming interruptions to work. In this study, we focus on how IM tools contribute to knowledge transfer at work, as well as their influence on team performance. Our research model is validated by a survey of work professionals (n=41) at a small sized company. Implications and conclusions are discussed.

• 통상정보연구
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• 제6권3호
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• pp.81-99
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• 2004

Research relevant to the electronic commerce tends to either overestimate or underrate the role of Information and Communication Technology (lCT). There is both technological skepticism within the social science circles and technical optimism within the engineering and computing field. Each perspective seems to have a limitation in adequately explaining the phenomenon of electronic commerce diffusion. Therefore, this research attempts to explore major characteristics of Web-based shopping systems as enablers of new business, concerning both the technical and business aspects in contemporary electronic commerce settings. On this basis, this paper addresses a configuration model of WBSS on the harmonious perspective concerning both the technical and business issues. It is our hope that both technical perspective and business perspective for exploring WBSS's configuration model presented in this paper can be an initial step towards a more balanced debate of ICT role, for electronic commerce.

• 복식문화연구
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• 제14권2호
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• pp.334-351
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• 2006

The purpose of study is to examine fashion bags reflected women's changing lifestyle, their needs and vogue in modern environment since 20th century. Today fashion bags can be divided into practical bag, evening bag, luxury bag and utility bag. Practical bag is a type of tote which is perfect for working mom or women carrying lots of things on a daily basis. Evening bag is a symbol of femininity in respect for its handmade artistry and impracticality by its small size. Luxury bag embodies human desire for high quality and being part of prestige of luxury brand regardless of its cost. Utilitarian bag was coming from military or sports gear and are popular among young generation armed with mobile computing or crazy about popular music and all kinds of sports. In contemporary fashion culture, fashion bags play an important roles on balancing women's social and domestic life as functional and decorative accessory.

• 한국정보과학회논문지:컴퓨팅의 실제 및 레터
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• 제15권6호
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• pp.430-434
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• 2009

본 논문에서는 분산해시테이블 기반의 구조적 P2P 오버레이 네트워크에서 효율적인 컨텐트의 공유와 검색을 위한 라우팅 기법을 제안한다. 기존의 익명성을 기반으로 하는 P2P 시스템과는 달리, 본 논문에서 제안하는 기법은 사회적 관계에 기반한 라우팅 테이블의 생성과 라우팅 알고리즘을 설계하고 이를 평가한다. 본 논문의 중요성은 사회적 관계에 기반한 분산 환경에서의 컨텐트 공유를 통해, 무임승차의 문제를 완화하고 악성 피어에 의한 네트워크 공격 위험을 줄일 수 있다는 점에 있다.

• 한국수학교육학회지시리즈D:수학교육연구
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• 제9권3호
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• pp.187-201
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• 2005

The spreadsheet Microsoft Excel is the most widely used mathematical tool in today's workplace. Moreover, it is also an outstanding means for developing a surprisingly wide range of creative and innovative educational uses within such areas as mathematical modeling, visualization, and instruction. The spreadsheet's format provides us with a tool that closely parallels the way in which we naturally carry out problem solving, while the spreadsheet creation process itself illuminates the underlying mathematical concepts. In addition, the spreadsheet's visual layout allows us to introduce a broad variety of challenging and interesting topics, and to design creative demonstrations through eye-catching animated graphics. The material presented comes from actual classroom mathematics teaching experience in both industrially advanced and developing nations. A series of highly visual interactive illustrations from mathematics, the natural and social sciences, computing, engineering, and the arts provide a number of usable examples. The material discussed is applicable at diverse levels, ranging from schools and universities through adult education and in-service teacher development programs.

• 산업경영시스템학회지
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• 제35권4호
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• pp.133-141
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• 2012

Virtual project organization may be recognized as one of the promising business models in which many knowledge sources externalize through cross boundaries of knowledge-based organizations. This paper proposes a knowledge competence evaluation of virtual project organization based on the following perspectives: 1) Individual knowledge perspective, 2) Activity-oriented knowledge perspective, and 3) Knowledge-driven social network perspective. In the framework, individual knowledge competence having experienced or learned from knowledge-based activities and virtual networks in the project, should be evaluated according to the assumption that knowledge and collaboration competence depends on the activities and networks acquired proportionally by the past participation to projects. An illustrative SI example is given in order to validate the proposed evaluation and computing procedure.

• International Journal of Internet, Broadcasting and Communication
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• 제5권1호
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• pp.9-13
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• 2013

This paper presents the concepts of ubiquitous computing technology to construct a ubiquitous learning environment that enables learning to take place anywhere at any time. This ubiquitous learning environment is described as an environment that supports students' learning using digital media in geographically distributed environments. The u-learning model is a web-based e-learning system that could enable learners to acquire knowledge and skills through interaction between them and the ubiquitous learning environment. Students are allowed to be in an environment of their interest. The communication between devices and the embedded computers in the environment allows learner to learn while they are moving, hence, attaching them to their learning environment.

• 디지털융복합연구
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• 제11권10호
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• pp.431-435
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• 2013

정보화 사회에서 디지털이라는 단어와 결합된 컨버전스는 정보통신 분야의 단위기술들의 융합을 통해 등장하는 새로운 제품이나 서비스를 일컫고 있다. 이러한 컨버전스 기술의 파급효과 및 컨버전스 사회의 현상들은 이미 경제, 사회, 문화등 사회의 전 부분에서 가시화되고 있다. 본 연구에서는 이러한 디지털 컨버전스 환경에서의 필요한 기술현황 및 전망과 컨버전스의 대표적 사례이면서도 차세대 모바일 대표시장의 가능성이 매우 큰 웨어러블 컴퓨터와 관련된 내용을 기술하였다.