• 한국초등과학교육학회지:초등과학교육
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• 제31권2호
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• pp.227-242
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• 2012

This research explores the scientific reasoning of pre-service elementary teachers in experimental design. The article focuses on pre-service teachers' responses to the questions in the worksheets which involve making their knowledge claims on extinguishing of a burning candle in a closed container, evaluating anomalous data, and designing experiment to test their ideas. Their responses are interpreted in terms of categories developed by Tytler and Peterson(2003, 2004). The interrelationship between conceptual knowledge and scientific reasoning is explored using the data. It is argued that coordination of ideas and evidence must be emphasized in the scientific investigations rather than fair test.

• 한국비블리아학회지
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• 제15권1호
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• pp.117-135
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• 2004

본 연구는 공정이용, 최초판매의 원칙을 중심으로 전자저널의 도서관 상호이용과 관련한 문제점을 고찰하고, 현행 전자저널 라이선스상의 관련 조항을 분석함으로써 향후 도서관상호이용과 관련한 도서관의 대응방안을 모색하고자 하였다. 전자저널에 대한 도서관 상호이용 형태 파악을 위해 국내 현행 라이선스 계약 조항과 국외의 대표적인 라이선스 계약모델의 관련 조항을 분석하였다.

• 한국경영과학회지
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• 제25권4호
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• pp.15-25
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• 2000

In this paper, we introduce a point-to-multipoint minimum cost flow problem with convex and demand splitting. A source node transmits the traffic along the tree that includes members of the point-to-multipoint connection. The traffic is replicated by the nodes only at branch points of the tree. In order to minimize the sum of arc costs, we assume that the traffic demand can be splitted and transmitted to destination nodes along different trees. If arc cost is linear, the problem would be a Steiner tree problem in networks eve though demand splitting is permitted. The problem would be applied in transmitting large volume of traffic from a serve to clients in Internet environments. Optimality conditions of the problem are presented in terms of fair tree routing. The proposed algorithm is a finite terminating algorithm for $\varepsilon$-optimal solution. convergence of the algorithm is obtained under monotonic condition and strict convexity of the cost function. Computational experiences are included.

• 한국비블리아학회지
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• 제11권2호
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• pp.39-48
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• 2000

지식사회에서 정보의 공동활용을 위하여 각 도서관이 수행하는 정보의 디지털화 및 이용자에게 정보를 전송하는 경우에 관련하여 개정된 저작권법의 내용을 검토한다. 그리고, 도서관 등은 이와 같은 법적 변화에 어떻게 대응하여야 할 것인지, 도서관자체적으로 무엇이 변화되어야 할 것인지를 제시한다.

• 한국도서관정보학회지
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• 제33권3호
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• pp.327-358
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• 2002

본 연구는 디지털 환경 하에서의 복제·전송과 관련한 도서관 면책 규정을 WCT와 EU 지침, 미국, 일본 및 호주 저작권법을 대상으로 하여 각각 면밀하게 분석하여 그 법문의 변화와 특징을 총체적으로 명확하게 규명하였다. 나아가 이러한 분석결과를 바탕으로 하여 디지털도서관의 복제·전송을 규율하는 우리나라의 현행 저작권법과 개정안의 제28조를 각각 분석하여 문제점을 지적하였으며, 이를 정비하기 위하여 수정·보완되어야 할 법적 개선방안을 구체적으로 제시하였다.

• 한국정보처리학회:학술대회논문집
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• 한국정보처리학회 2001년도 추계학술발표논문집 (하)
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• pp.1521-1524
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• 2001

네트워크에서 다양한 애플리케이션의 서비스 성능을 저하시키는 불공정 큐잉 문제를 해결하기 위해 현재 공정 큐잉 분야가 활발히 연구중이다. 그 중에서 DRR(Deficit Round Robin)은 작업 복잡도가 낮고 구현이 간단한 기법으로 이전 라운드에서의 서비스 결손량을 다음 라운드에서 서비스하도록 하여 공정한 서비스를 보장하는 기법이다. 그러나 엔터프라이즈 환경과 같은 고속 네트워크 환경에서 최대 수 kbyte 이상의 패킷 사이즈를 가지는 서비스들에 대해 불필요한 SQ(Service Quantum) 재설정 횟수 및 라운드 순회 횟수로 인한 지연시간 증가를 일으킨다. 본 논문에서는 매 라운드마다 전송을 앞둔 패킷의 사이즈를 고려하여 SQ를 동적으로 설정하는 기법을 제안한다. 제안한 기법은 각 큐의 가장 앞쪽에 있는 패킷들 중 사이즈가 아무리 큰 패킷도 현재 라운드에서 서비스될 수 있고, 패킷을 처리하는데 있어서의 작업 복잡도 또한 최소화하는 기법으로 다양한 애플리케이션들에 대한 지연시간을 최소화한다.

• 경영과학
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• 제23권3호
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• pp.225-242
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• 2006

The Spectrum Usage Fee System which has been introduced and enforced since 1993 has had a great role for effective use of the radio frequency resources and the promotion of radio wave industry. However, the current system has been criticized due to several drawbacks. For example, broadcasting stations and national institutions are exempted whereas the overdue utility rate on some frequency has been imposed. So there has been rising the questions on whether the principles of fair imposition are broken. Another problem regarding the current system is that how to calculate the fee is too much complicated, and it needs to be revised into a simpler and clearer formulation. In this regard, this study intends to propose a new calculation framework for the radio spectrum usage fee and then prove its validity empirically on the basis of real data gathered from MIC and focus group interview.

• Journal of Dairy Science and Biotechnology
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• 제25권1호
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• pp.37-45
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• 2007

Food labelling is the primary means of communication between the producer and purchaser and plays an important role in consumer's choice of food. Food labelling applying to livestock products, such as meat products (ham, sausage etc.), milk products(milk, fermented milk, butter and cheese etc.) and egg Products is regulated by 'Livestock Products Labelling Standard', National Veterinary Research & Quarantine Service (NVRQS) Notification. This study presents the principles of Korean milk products labelling provision and its recent revision to prevent consumer from misunderstanding and facilitate fair trade practices in market and also keep consistencies with international and relative national regulations. This study also suggests milk products labelling policy direction in the future.

• 유통과학연구
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• 제3권1호
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• pp.23-42
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• 2005

The service offer expectation and the desire of customers to a large-sized rate influence store also increase as a result of such environmental change. the counter where research of a book was upgraded from differentiation pursuit by competition between business condition in business condition in the case of the domestic rate influence store which has put the focus on service strengthening The work shrine which cannot reach here the competition predominance in the domestic market it will be hard coming to secure, when environmental change of inside large-sized rate influence store industry is taken into consideration The research which tried to receive customer service failure recovery carried out actual proof analysis in the influence to which fair nature lateness of a customer attains to the re-purchase intention to this store of customer satisfaction and future by service recovery process for an object in the customer who held service failure recovery experience in the domestic large-sized rate influence store.

• Journal of Communications and Networks
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• 제12권2호
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• pp.181-190
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• 2010

A multitude of overlay network designs for resilient routing, multicasting, quality of service, content distribution, storage, and object location have been proposed. Overlay networks offer several attractive features, including ease of deployment, flexibility, adaptivity, and an infrastructure for collaboration among hosts. In this paper, we explore cooperation among co-existing, possibly heterogeneous, overlay networks. We discuss a spectrum of cooperative forwarding and information sharing services, and investigate the associated scalability, heterogeneity, and security problems. Motivated by these services, we design Synergy, a utility-based overlay internetworking architecture that fosters overlay cooperation. Our architecture promotes fair peering relationships to achieve synergism. Results from Internet experiments with cooperative forwarding overlays indicate that our Synergy prototype improves delay, throughput, and loss performance, while maintaining the autonomy and heterogeneity of individual overlay networks.