• 한국정보통신학회:학술대회논문집
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• 한국해양정보통신학회 2007년도 춘계종합학술대회
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• pp.823-826
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• 2007

유비쿼터스 환경에서 사용자가 휴대하는 이동장치는 제한적인 능력을 갖기 때문에 강력한 보안성과 경량의 연산량을 지원하는 인증 프로토콜이 요구된다. 최근에 제안된 S/key 기반의 인증기법들은 경량의 암호화 연산과 함께 강력한 사용자 인증, 세션키 교환을 제공함으로써 이러한 요구사항을 만족한다. 특히, You와 Jung이 제안했던 프로토콜은 효율성과 보안성을 함께 고려할 때 가장 우수하다. 본 논문에서는 You-Jung 기법을 다른 기법들과 비교 분석하고 실제 유비쿼터스 환경에서의 적용을 위해 이동장치 상태변화를 설계하고 프로토콜을 구현한다.

• 가족자원경영과 정책
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• 제14권4호
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• pp.21-38
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• 2010

The purpose of this study is to clarify the motivation of adolescent volunteers based on exchange theory by analyzing benefits and costs. The activation for family-volunteering is explored to decrease the cost of volunteering. Data were collected from 463 adolescents and analyzed using SPSS 16.0 program. The statistics used for analysis were the factor analysis, cluster analysis, T-Test and ANOVA, Findings indicated that a 75.2% of adolescents participated in voluntary activities during last one year, but a 90.3% of subjects was not taken part in family volunteering. Family volunteering has not been activated but adolescents hoped high to participate with family. Adolescents evaluated high the cost of family time lost because of volunteering. The clusters evaluating the costs of volunteering low participated more than other clusters. From these results, it was proposed that costs of volunteering such as conflicts with members of family or supervisors should be lessened than the benefits of it emphasized. The family volunteering is suggested to decrease the cost of family time loss.

• 한국지역사회생활과학회지
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• 제17권4호
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• pp.15-27
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• 2006

Most countries recognize traditional knowledge as an economical resource in recent years, and so are actively participating in WIPO discussions for making sure of their intellectual property rights. In this study, the definition of traditional knowledge was discussed for making clear its categories and relative subjects. A tool for Korean Traditional Knowledge Resource Classification(KTKRC) was developed for putting the data of the resources in order, and was indispensable for searching for and examining cultural artifacts within the system of international intellectual property rights. KTKRC covers comprehensively our various traditional knowledge resources and has a similar structure to IPC for international searching, examining, and information exchange. KTKRC consists of a section of traditional knowledge(A), and three subsections: production technology(A0), living technology(A2) and creative technology(A4). The subsections include 8 classes, 28 subclasses, 105 groups, and a great number of subgroups.

• 한국정보통신학회논문지
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• 제9권5호
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• pp.1012-1018
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• 2005

컴퓨터 산업이 발전하고 인터넷이 확산됨에 따라 원격 사용자들 간의 정보 교환을 단순 텍스트 데이터들 뿐만 아니라 음성이나 화상과 같은 멀티미디어 데이터들을 실시간으로 주고받을 수 있는 화상회의 시스템이 등장하였고 다양한 분야에서 활용되고 있다. 하지만 현재 개발된 대부분의 시스템들은 고가의 다자간 접속 장비를 필요로 하거나 높은 대역폭의 네트워크 자원을 필요로 하는 등의 문제점들을 가지고 있다. 이에 본 논문에서는 고가의 접속 장비를 사용하지 않고 최소한의 네트워크 자원을 이용해 소프트웨어적으로 안정적이고 고화질의 멀티미디어 정보 및 화면 공유 환경을 제공할 수 있는 화상회의 시스템을 설계 및 구현하였다.

• 한국국방경영분석학회지
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• 제6권1호
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• pp.93-101
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• 1980

An effectively designed budget system in the poor resources environment necessarily has three design criteria : (i) to be both planning-oriented and control-oriented, (ii) to be both rationalistic and realistic, (iii) to be sensitive to the variations of resources environment. PPB system is an extreme (planning-oriented and rationalistic) and conventional OEB/OUB system is the other extreme (control-oriented and incrementalistic). Generally, the merits of rationalism are limited because of the infeasibility of applications. Hence, mixtures of the two extremes such as MBO, ZBB, and RZBB have been examined and applied during the last decade. The classical mathematical models of capital budgeting are the starting points of the development of the Budget-Mix Model introduced in this paper. They are modified by the followings: (i) technological-resource constraints, (ii) bounded-variable constraint, (iii) the exchange rules. Special emphasis is laid on the above (iii), because we need more efficient interresource exchanges in the budget-mix process. The Budget-Mix Model is not based on optimization, but a heuristic approach which assures a satisficing solution. And the application fields of this model range between the incremental Nonzero-Base Budgeting and the rational Zero-Base Budgeting. In this thesis, the author suggests 'the budget- mix concept' and a budget-mix model. Budget-mix is a decision process of making program-mix and resource-mix together. For keeping this concept in the existing organization realistic, we need the development of quantitative models describing budget-mix situations.

• Journal of Communications and Networks
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• 제15권1호
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• pp.102-110
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• 2013

This paper considers a cooperative orthogonal frequency division multiple access (OFDMA)-based cognitive radio network where the primary system leases some of its subchannels to the secondary system for a fraction of time in exchange for the secondary users (SUs) assisting the transmission of primary users (PUs) as relays. Our aim is to determine the cooperation strategies among the primary and secondary systems so as to maximize the sum-rate of SUs while maintaining quality-of-service (QoS) requirements of PUs. We formulate a joint optimization problem of PU transmission mode selection, SU (or relay) selection, subcarrier assignment, power control, and time allocation. By applying dual method, this mixed integer programming problem is decomposed into parallel per-subcarrier subproblems, with each determining the cooperation strategy between one PU and one SU. We show that, on each leased subcarrier, the optimal strategy is to let a SU exclusively act as a relay or transmit for itself. This result is fundamentally different from the conventional spectrum leasing in single-channel systems where a SU must transmit a fraction of time for itself if it helps the PU's transmission. We then propose a subgradient-based algorithm to find the asymptotically optimal solution to the primal problem in polynomial time. Simulation results demonstrate that the proposed algorithm can significantly enhance the network performance.

• 가족자원경영과 정책
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• 제15권4호
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• pp.1-17
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• 2011

The purpose of this study is to analyze the correlation between the perspectives of Green Growth and Healthy Families, and to suggest an expansive paradigm for the study on Healthy Families in the context of Home Economics. From the perspective of Green Growth, the sustainability for future generations, the ecological value, and the foundation of the community network were searched as the key points. So, from the key points, and in the context of Healthy Families, two strategies were suggested: First, the care services in the Center for Healthy Families have to be extended to give more opportunities to the users and the various demands for the care services can be satisfied. Secondly, the exchange of services has to be more activate in the local community so that our society itself can become a completely family-friendly society. Moreover, this study suggested a mission of Home Economics, that the study for family policy, the development of related programs, and the education of professionals for the Center for Healthy Families can be more connected with the perspectives of Green Growth, especially the focus on family, its ecological living patterns and the detailed attitudes needed to balance between industry, the economy, and family in the context of Green Growth.

• Journal of Electrical Engineering and Technology
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• 제6권5호
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• pp.605-612
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• 2011

As the power grids are integrated into one big umbrella called a "smart grid," communication protocol plays a key role in successful operations. The successful deployment of smart grid interoperability is a major hurdle that must be overcome. The micro grid, a small power system that distributes energy resource, is operated in diverse regions. Different vendors use different communication protocols in the operation of the micro grid. Recently, the IEC 61850 has been legislated to solve the interoperability problems in power utility automation. The present paper presents a micro grid system based on the IEC 61850 protocol. It consists of a micro grid monitoring system, a protocol converter that transforms serial data to IEC 61850 data, and distributed energy resource controllers for diverse DER nodes. A developed communication gateway can be deployed for DER controllers with serial links to exchange data with IEC 61850-based devices. The gateway can be extended to IEC 61850-based distribution automation systems, substation automation systems, or SCADA.

• 기술혁신연구
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• 제2권1호
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• pp.89-115
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• 1994

Japanese firms have developed their own distinctive human resource management(HRM) practices for R&D scientists and engineers. These practices consist of homogeneity of work group, standardized in-house training programs, great standardization and company control of careers, and broad job rotation following the process of commercialization of developed technology. These practices facilitate human and informational exchange and sharing between basic laboratories and development departments as well as between R&D and marketing department which contribute to the ket competitive advantage of Japanese products. But recently Japanese firm are forced to change their HRM practices. They face some srious problems in continuing their long0standing strategy of being a rapid and skillful‘ technology follower’,drawing on the basic research performed in the advanced nations and embodying it in products that are produced with high quality at relatively lower cost. There is a growing trend of strengthening basic research among Japanese firms today. In accordance with the emphasis on basic research, Japanese firms have been adopting new HRM practices for scientists and engineers which are in the opposite direction of the traditional one. These newly developed practices stress on individual vitality rather than group cohesiveness from the fusion of individual difference. These include heterogeneity of work group, multiple career paths to be chosen by individuals, incentive plan based individual performance.

• 설비공학논문집
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• 제17권6호
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• pp.521-528
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• 2005

This study has been conducted to investigate the potential energy reserve amount of river water as energy resource with useful temperature difference. Since the river water temperature is one of the primary parameters deciding the potential amount of river water energy reserve amount, the climate change effects on it are critically important. In this study, the heat exchange processes and the inter-relationship between the air temperature and river water temperature have been theoretically analyzed. Based on the present study, the potential energy reserve of river water is calculated to amount to 192,000 Tcal/year. Among this, it is estimated that approximately 2,000 Tcal/year can be directly utilized for heat pump energy sources.