• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2000년도 제15차 학술회의논문집
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• pp.59-59
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• 2000

In this paper, we present a framework for modeling and control of multiple mobile robots which cowork within a bounded workspace and limited resources. To achieve this goal, we adopt a formalism of discrete event system and supervisory control theory based on Petri nets. We can divide our whole story into two parts: first, we search the shortest path using the distance vector algorithm, and then we construct the control scheme from which a number of mobile robots can work within a bounded workspace without any collision. The use of Petri net modeling allows us In synthesize a controller which achieves a control specification for the desired closed-loop behavior efficiently. Finally, the usefulness of the proposed Petri net formalism is illustrated by a simulation study.

• Journal of the Korean Wood Science and Technology
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• 제42권2호
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• pp.112-118
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• 2014

The depth effect on bending strength of Japanese larch structural lumber was investigated by using the published data of two different depth lumbers with the same length. Depth effect parameters were derived from Weibull's weakest link theory and compared to the results from other researches. Depth effect on bending strength was significant for No.1 and No.3 lumber, but not insignificant for No.2 lumber. Calculated value of the depth effect adjustment factors was 0.21, 0.11 and 0.22 by lumber grade, respectively. These results were similar to those results from previous researches and supported depth effect on bending strength of lumber. An apparent depth adjustment factor has been proposed to 0.2 in the literatures. Based on this study, depth adjustment factor was considered to 0.2 as a conservative optimum design value that should be incorporated in domestic building code (KBC) for structural lumber.

• 한국수자원학회논문집
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• 제31권3호
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• pp.303-308
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• 1998

격자기반의 물수지 기법을 이용하여 강우에 의한 지표흐름과 지표하흐름의 시간적 변화와 공간적 분포를 모의할 수 있는 분포형 강우-유출모형을 개발하였다. 본 모형은 제 수문인자들의 격자별 물수지를 계산하여 단방향 흐름경로 알고리듬에 의하여 지표 및 지표하 흐름을 추적한다. 전처리과정으로서 GRASS를 이용하여 모형에 필요한 ASCII 형태의 자료들을 준비하고, 후처리과정으로서 모형의 수행결과인 유역의 유출량, 유출고, 토양수분, 본포 등을 GRASS상에서 도시할 수 있도록 ASCII형태로 출력하도록 구성하였다.

• ETRI Journal
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• 제34권4호
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• pp.591-601
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• 2012

Unstructured peer-to-peer (p2p) networks usually employ flooding search algorithms to locate resources. However, these algorithms often require a large storage overhead or generate massive network traffic. To address this issue, previous researchers explored the possibility of building efficient p2p networks by clustering peers into communities based on their social relationships, creating social-like p2p networks. This study proposes a social relationship p2p network that uses a measure based on Hebbian theory to create a social relation weight. The contribution of the study is twofold. First, using the social relation weight, the query peer stores and searches for the appropriate response peers in social-like p2p networks. Second, this study designs a novel knowledge index mechanism that dynamically adapts social relationship p2p networks. The results show that the proposed social relationship p2p network improves search performance significantly, compared with existing approaches.

• 지역사회간호학회지
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• 제13권4호
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• pp.732-742
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• 2002

There are few research on the social drinking experience reported by women. Thus, it is necessary to understand the increasing tendency of womens drinking experience in the sociocultural context. This study was aimed to explore and delineate the drinking experience of full-time house wives base don Strauss and Corbin's grounded theory (1998). The subjects of this study were 10 full-time middle-aged house wives who were living in Seoul region. The data were collected through several in-depth interviews and observations until the theoretical saturation was achieved. The data were analyzed using Strauss and Corbin's grounded theory method. The results of this study generated a paradigm that the drinking experience of the full-time middle-aged house wives has a core category of 'free-oneself-from' and is also connected with mingling, anguish, accessibility, reaction of other people, change, personal resources, self-expression and building relationships by drinking. All processes from the occurrence of the central phenomenon to extinction are as follows; 1) Starting the process of the drinking experience for mingling and resolving anguish, and by having an easy accessibility; 2) Perceiving the process of reaction by other people, physical change of herself. and psycho-behavioral change; 3) Experiencing the process of free-oneself from thorough drinking; 4) Acknowledging the process of the resources for free-oneself-from; 5) Selecting the process of self-expression according to the resources; 6) Building the process of the relationship with drinking as a way of self-expression. Based on this paradigm, 4 hypothesis and 4 types are generated. Thus, this study suggests that it is useful to develop nursing interventions to improve the self-esteem of the full-time middle-aged house wives and to provide them various methods of problem solving strategies. This study also proposes that there should be a strategic program for the women so that they could make a route for positive self-expression by achieving a proper relationship with drinking.

• 한국지역사회생활과학회지
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• 제19권2호
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• pp.245-265
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• 2008

The Lifelong Learning City Project has made quantitative expansion as well as qualitative growth since 2001 but the project has been criticized by academic scholars and field practitioners. The Lifelong Learning City Project is a national policy project which has been promoted by the Ministry of Education and Human Resources Development and should be required to make production profits proportional to the amount of public finance. The Lifelong Learning City Project is a community development project intended to promote growth and progress by supporting the community in lifelong learning endeavors. Therefore, the community development theory could offer guidelines to the Lifelong Learning City Project. Based on this assumption, this study intends to investigate the Lifelong Learning City Project at the national, city, and county levels using the community development theory. The improvement methods of the Lifelong Learning City Project are role allotment between national and wide level projects supporting organizations, and the establishment of a system and a long term project policy. In addition, the project is to have a more systematic performance. It is to enhance opportunities for community members' participation, and practice in planning, performance of learning, and the proper performance in regard to the community conditions and specificity. The most important goal of the Lifelong Learning City Project is to support the empowerment of community members by making opportunity planning, practicing and sharing lifelong learning more accessible.

• 한국정보시스템학회지:정보시스템연구
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• 제16권1호
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• pp.159-178
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• 2007

As generalization of using PC and the Internet information technology (IT) users in organizations are not passive clients but active producers of information services. One of the reasons for the change of users' role is social interactions with other users and IT department staffs. That is, users can find and develop new functions and usefulness of IT, especially, Web-based ones through communication with other users or IT department staffs. The objective of this study is to investigate the relationship between IT department service quality and social interactions with other users. For this purpose, we suggest a research model based on adaptive structuration theory (AST), which is to explain the changes in social structure (rules and resources) of IT by social interactions, as well as service quality theory. Our model's exogenous variable is service quality which is a second-order factor consisting of reliability, responsiveness, assurance, and empathy. As endogenous variables, we adopt two variables for appropriateness of using IT, faithfulness of appropriation and consensus on appropriation. Finally, dependent variables of ow model are usefulness and ease of use which can be considered as attitude on IT as well as other variables for appropriateness. For empirical test our model is applied to users of groupware and ERP in organizations and analyzed by partial least square. In result, all hypotheses suggested in our model are supported statistically.

• 한국생활과학회지
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• 제23권6호
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• pp.981-997
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• 2014

This study set out to examine the adaptation capabilities of husbands in multicultural families and further identify strengths to maintain a healthy multicultural family based on the grounded theory. For those objectives, the investigator had an ongoing interview with ten husbands that had a child in the setting of multicultural family and were judged to maintain a healthy family. Question analysis through the method of Strauss & Cobin and the abstraction and categorization process among similar concepts identified total 89 concepts, 24 subcategories, and 11 categories. In a paradigm model according to the axial coding results, the causal condition was "having an international marriage with the spouse"; the contextual conditions were "crisis in the development of multicultural family" and "general family conflicts"; the mediating condition was "positive self-rationalization"; and the central phenomena were "family-oriented value" and "cultural tolerance." The operation and interaction strategies for them were "forming communicative couple relationships," "cultivating cultural sensibility," and "utilizing unofficial external resources." The adaptation capabilities were "satisfaction with family life" and "pride in building a healthy multicultural family."

• 한국학교ㆍ지역보건교육학회지
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• 제7권
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• pp.87-99
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• 2006

Objectives: This study is to draw the design of the program which is improve school health promotion participation by applying the Social Ecological Model based on the literature review on the health promotion. Methods: Literature review was carried out based on 5 factors of social ecological model using computer search engines of Google, ProQuest, and Riss4U. Results; Social Ecological Model is consist of individual, interpersonal, institutional/organizational, community, and policy. Individual sphere is drawn from Health Belief Model, interpersonal sphere is Social Support Theory, institutional/ organizational sphere is institutional resources theory, community sphere is community model, and policy sphere is Social Marketing Theory. The literature review show that the important variables affecting health promotion exist in each sphere. Individual sphere has social economic status, age, sex, sensitivity and specificity of illness, self-efficacy. Interpersonal sphere has support and use of family, friend and neighbor. Institutional/Organizational sphere has environment service reliability and utility. Conclusions: Community sphere has distance, neighborhood safety, interrelationship among institutions. Policy sphere has cost, legislation advertisement, lobby and concern and leadership of Institution.

• 대한조선학회논문집
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• 제46권3호
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• pp.362-371
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• 2009

Shipbuilding is a typical 'build to order' industry. It has a business model that generates revenues from building various ships and offshore products in accordance with owner's requirements at each production stage. Under uncertainty in shipping market, it is very essential for the shipbuilder to prepare the fast and competitive decision for product portfolio strategy in order to maximize contribution margin by exploiting production facilities and constraints. In this study, we introduce the unique decision supporting methodology for the optimal product portfolio sets based on Theory of Constraints(TOC). This methodology is established by adopting the concept of Drum Buffer Rope(DBR) in constraints planning and Throughput Accounting (TA) in management accounting of TOC. In addition, Decision Supporting System(DSS) is implemented. This DSS system provides a throughput estimator with reflecting the cost structure of shipbuilding industry and a resource simulator built on heuristic algorithms to operate major constraint-resources in shipyard such as dock, quay and pre-erection area etc. Several examples are presented to show that the proposed methodology and system can effectively support the strategic decision-making process of a global shipbuilding company.