• Journal of the Institute of Electronics Engineers of Korea TC
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• v.40 no.10
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• pp.89-94
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• 2003

Passive Optical Network(PON) architecture is a very simple. However media access protocol is necessary to the PON because the ONUs should share a channel in the upsteam direction. We propose the design of dynamic bandwidth allocation algorithm for improved bandwidth utilization in the broad bandwidth access network that uses Ethernet PON. The object of our study shall be to decrease a unused remainder bandwidth of granted timeslot for a upstream traffic transmission. We propose that OLT notifies ONU of maximum transmission window during discovery and ONU request a amount under maximum transmission window after it checks a frame length. We confirm that the proposed algorithm shown improving performance from bandwidth utilization and queueing delay point of view through the simulation result.

• Review of Korean Society for Internet Information
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• v.8 no.4
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• pp.88-98
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• 2007

• The Journal of Korean Institute of Communications and Information Sciences
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• v.25 no.1A
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• pp.132-141
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• 2000

In this paper, we proposed the MAC protocol of APON supporting multi-class traffic such as CBBUVBR, ABR, UBR, to guarantee the required QoS of each service. For this, we analyze the performance of variousrequest mechanisms and employee the different request mechanism for each traffic classes. Upstream anddownstream frame structures to minimize transmission overhead are proposed based on our request mechanism.The proposed MAC protocol applies the different priority to permit distribution process. CBBWBR traffic, withthe stringent requirements on CDV or delay, is allocated prior to any other class. ABR traffic, which hasnon-strict CDV or delay criteria, uses flexibly the available bandwidth but ensures a minimum cell rate (MCR).UBR traffic is allocated with lowest priority for the remaining capacity. The performance of proposed protocol isevaluated in terms of transfer delay and 1-point CDV with various offered load. The result of simulation showsthat the proposed protocol guarantees the required QoS of the corresponding category, while making use of theavailable resources in both an efficient and dynamical way.

• Journal of the Institute of Electronics Engineers of Korea TC
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• v.37 no.1
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• pp.12-22
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• 2000

This paper presents the window-based permit distribution scheme for efficient medium access control to support multiclass traffic in APON(ATM over passive optical network). The proposed MAC protocol considers the characteristics of QoS(Quality of Service) for various traffic classes. A periodic RAU(request access unit) in upstream direction, includes dedicative request fields for each traffic category within the request slot. The transmission of upstream cell is permitted by the proposed window-based spacing scheme which distributes the requested traffic into several segments in the unit of one spacing window. The delay sensitive traffic source such as CBR or VBR with the stringent requirements on CDV and delay, is allocated prior to any other class. In order to reduce the CDV, so that the permit arrival rate close to the cell arrival rate, Running-Window algorithm is applied to permit distribution processing for these classes. The ABR traffic, which has not-strict CDV or delay criteria, is allocated flexibly to the residual bandwidth in FIFO manner. UBR traffic is allocated with the lowest priority for the remaining capacity. The performance of proposed protocol is evaluated in terms of transfer delay and 1-point CDV according to various offered load. The simulation results show that our protocol has the prominent improvement on CDV and delay performance with compared to the previous protocol.

• Journal of the Korean Society for information Management
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• v.13 no.2
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• pp.189-221
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• 1996

Copyright is challenged by the rapid development of digital technology. This study investigated a number of new copyright-related issues : electrocopying, digital transmission, legal definition of multimedia, moral right, fair use et al. To use copyright works we need licensing of rights and permissions. Then at this paper we examined the scopes and contents of permission with copyright owners or publishers, also considered relationships of copyright owners with distributors and end-users. Finally, to protect rights of copyright owners and use freely copyright works, we suggested introduction of 'collective management system of copyright' and construction of 'copyright management information system' .

• Proceedings of the Korean Society for Information Management Conference
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• 2010.08a
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• pp.105-110
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• 2010

IT 기술에 의해 정보유통 환경이 진화하면서, 정보 획득의 방법에 있어서 웹과 디지털 기술을 활용하는 전자원문서비스가 활성화되고 있다. 그러나 국내 저작권법상 저작권자의 개별적인 허락없이는 해외 학술자료의 전자원문서비스가 불가능한 실정이다. 이 연구에서는 저작권법 조항의 문제점을 지적하고, 전자원문서비스의 실현을 위한 방안으로 확대된 저작권 집중관리제도의 도입을 검토한다. 확대된 저작권 집중관리제도(ECL)는 집중관리단체가 대리하지 않는 권리자에게로 이용허락계약을 확대시키는 것이다. ECL을 통해 국내 어문저작물의 복제 전송에 대한 저작자의 권리를 신탁관리하는 (사)한국복사전송권협회가 해외 학술자료의 이용에 대해서도 사용승인 및 사용료 징수 등의 역할을 수행하며, 이를 통해 도서관은 진정한 전자원문서비스를 실현할 수 있을 것이다. 전자원문서비스를 통해 저작권의 합리적인 준수는 물론, 학술정보 유통 활성화에 기여함으로써 궁극적으로 국가 경쟁력 제고를 도모할 수 있을 것이다.

• The Korean Publising Journal, Monthly
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• s.250
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• pp.12-13
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• 1999

영상시대, 책에도 사진저작물의 이용이 늘어나면서 저작권 문제가 새로운 쟁점으로 떠올랐다. (본지 제231호 참조) 출판사들은 사진저작물의 이용 한계와 범위에 대해 정확히 모른 채 제작을 해온 것도 사실이다. 이 글에서 필자는 "본문과 필연성이 인정되는" 인용의 경우, 별도로 저작권자의 허락을 받지 않아도 사진저작물으 이용이 가능하다고 해석하고 있다. 이같은 해석은 저작권 문제에 새로운 논쟁의 단초가 될 수 있다. 많은 관심을 바란다.

• Digital Contents
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• no.10 s.65
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• pp.56-62
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• 1998

최근 미국에서는 Feist 판결 이후 데이터베이스의 보호에 대해 저작권법에만 의존하기에는 미흡하다는 인식이 확산되었다. 이에 저작물성이 인정되지 않는 데이터베이스에 대해 주법상의 부정이용을 주장하여 해결하려는 움직임이 판례에서 종종 보여지고 있는데, 아래에서 소개하려는 NBA사건도 이와 관련된 사건으로서, NBA 경기에서 점수 등의 정보를 허락없이 이용하는 행위가 부정이용에 해당하는가가 쟁점 사항이다.

• Journal of the Korean Society for information Management
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• v.33 no.4
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• pp.269-291
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• 2016

This study analyzed 1,890 KRF journals to understand the current situation and problems related to copyright management by journal publishers. The results of the study are as follows: 32.6% of journals did not provide any copyright notice, 77.1% of 1,141 journals which gave copyright information with regulation documents did not specify the type of author's property right to be transferred and most of the journals which owned copyright transferred from the author did not specify the permission needed to use their article. This study suggested that journal publishers establish the object and method for distribution of journal articles and then develop and publish their copyright policy suited to their own objective.

• 방재와보험
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• s.43
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• pp.88-89
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• 1989

현재 시중에 유통되고 있는 각종 상품에는 품질보증마크가 부착되어 있다. 이들 보증마크는 정부나 공신력을 갖춘 민간기관에서 시험검사를 한후에야 부착을 허락하기에 좋은 상품임을 믿고 고르는데 기준이 되고 있다. 많은 양의 외국산 물품이 수입되어 상점에서 쉽게 구입할 수 있게 된 요즘 국내외에서 이용되고 있는 각종 품질보증마크의 종류와 그 특성을 알아봄이 필요하겠다.