• Journal of KIISE:Information Networking
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• v.29 no.4
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• pp.405-411
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• 2002

Open interfaces in the optica] Internet have been progressed by OIF's ISI, ITU-T ASTN's CCI and IETF's GSMP extensions with optical switching. These open interfaces enable the separation between the control plane and the optical transport plane. This separation allows flexibility in the network, but it suffers more setup delay than the traditional switch-by-switch connection setup. We propose the parallel interworking model, which will reduce the connection setup delay in the open interface of optical Internet. Based on the switch controller's caching capability about networks states, the parallel interworking procedures between signaling protocol and GSMP protocol are performed in the switch controller. We simulated and evaluated our proposed parallel interworking model and the existing sequential interworking model in terms of a connection setup delay and a completion ratio. We observed that the completion ratios of the two interworking models were quite close. However the connection setup delay of parallel interworking model is improved by about 30% compared with that of the sequential interworking model.

• Journal of the Korean association of regional geographers
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• v.16 no.6
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• pp.673-688
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• 2010

The purpose of this study is to develop an optimization model for reconstructing local administrative districts using spatial analysis and modeling. For this, literature related to reorganization of local administrative systems was critically reviewed and criteria for redistricting were extracted. An optimization model for reconstructing administrative districts was formulated based on these criteria. The model considered three criteria; homogeneity within a reconstructed district, equity among reconstructed districts, and spatial arrangement. Homogeneity for relieving spatial mismatch between administrative and living(economic) boundaries is measured by spatial interaction within a district. Equity among districts is evaluated using population, area, and financial independence. Finally, spatial arrangement is measured by compactness and contiguity. The developed optimization model was implemented using Automated Zoning Procedure(AZP) in GIS environment and applied to a problem aggregating Si-Gun administrative units into broader districts. Application results demonstrate that the model can provide optimal districts according to alternative objective functions.

• Proceedings of the Korean Society for Emotion and Sensibility Conference
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• 1999.03a
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• pp.133-137
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• 1999

테스트의 종적 분할 모델은 적응성, 강건성, 속응성의 관점에서 장점을 갖는다. 그러나 종적 분할 모델을 실제로 구현하기 위해서는 환경에 대한 적자가 시스템 운영을 장악해야 한다는 전제 조건이 충족되어야 한다. Brooks의 Subsumption 모델은 이러한 조건을 충족시키기에 충분하지만 subsumption 제약 자체가 일반적인 도메인에 적용되기에는 지나치게 엄격한 점이 있다. 본 논문에서는 이에 대한 한가지 대안으로 감성 계층을 이용한 방안을 제시한다. 감성 계층을 사용하는 경우 시스템을 구성하는 모듈 상호간에 있어서 보다 단순한 구조와 다양한 효과를 갖는 "관계 설정"이 가능해진다. 본 논문에서는 관계 설정에 대한 일한 유연성이 일반적인 도메인에 대한 종적 분할 모델의 적용 능력을 개선시킬 수 있음을 보인다.수 있음을 보인다.

• Proceedings of the Korea Information Processing Society Conference
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• 2024.05a
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• pp.772-773
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• 2024

의미적 정보까지 학생 모델에게 학습시키기 위한 지식 증류 기법은 많이 논의되어 왔다. 그러나 학생 모델의 용량이 교사 모델의 용량에 비해 부족함에서 발생하는 의미적 정보 손실에 대한 논의는 아직 진행되지 않았다. 본 논문에서는 의미적 정보의 최소 단위를 교사 모델의 레이어로 설정하여 학생 모델이 지식 증류를 시작하기 전 최적의 지식 증류 대상을 설정하는 최적 은닉층 선정 알고리즘을 제시한다.

• Proceedings of the Korean Information Science Society Conference
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• 2001.10a
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• pp.625-627
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• 2001

본 논문에서는 OSGi서비스 프레임워크 환경에서 서비스의 접근 통제 기법을 구현할 수 있는 정형화된 보안 모델을 제시하고 있다. OSSEM(OSGi Service Security Extension Model)이라고 하는 이 보안 모델은 위임, 허가, 거부의 3가지 권한 엔트리를 정의하여 동적으로 설치되는 번들에서 독립적인 보안 정책의 설정을 지원하며, 다른 번들의 정책과 결합될 때 안전한 서비스의 수행을 보장한다. 이 모델은 유연성있는 보안 정책의 설정의 가능하고 OSGi 서비스 프레임워크 환경에서 기존의 Java 2 보안 아키텍처와 쉽게 통합이 가능하므로 번들과 서비스에 대한 접근 통제 뿐만 아니라 OSG 내부 자원의 접관 통제 방안으로도 확장할 수 있다.

• Journal of Korea Multimedia Society
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• v.4 no.5
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• pp.455-464
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• 2001

For future multimedia services, one of the most crucial issues is building an access network that can accommodate multimedia services in subscriber network. The VB5.2 interface of B-ISDN located between an access network and a service node allows dynamic allocation and release of ATM resources. The SG 13 of ITU-T is standardizing the B-BCC protocol, which is sequentially interworked with signaling protocols in the service node. To minimize a connection setup delay of the sequential interworking mode, we proposed the parallel interworking model in which the SN executes simultaneously the connection control protocol of VB5.2 interface and signaling protocol. We simulate two interworking models in terms of a connection setup delay and a completion ratio. The results of simulation show that our proposed parallel interworking model for the VB5.2 interface reduces the setup delay and has the similar completion ratio compared to the sequential interworking model. however, the connection setup delay of parallel interworking model becomes about seven tenths of that of the sequential interworking model and the improvement become larger as the arrival rate increased.

• Spatial Information Research
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• v.13 no.2 s.33
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• pp.167-183
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• 2005

Wetlands are a transitional zone between aquatic and terrestrial ecosystems, and a habit for the various biospheres. The main purpose of this study is to suggest a new technique that establishes the management districts of inland wetlands. To establish management districts of sub-watershed units, this study used the BurnDEM techniques. The management district resulted form this study are assessed its effectivity using an overlap of inland wetland map and sub-watershed maps classified by 18 sub-watershed. The result of this study could be applied to build a national inland wetland database.

• Journal of the Institute of Convergence Signal Processing
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• v.12 no.3
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• pp.194-198
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• 2011

In this paper, we obtained the path loss characteristics in the 850 MHz for Russia area by using the free space path loss model and Okumura-Hata path loss model. In order to extract the additional path loss model parameter from the new Russian regional properties, the mean square error technique is used to obtain the correction factor. According to the obtained correction factor, the differences for the free space and Hata path loss model are 17, 6 dB in the 5 ~ 10 Km, 28, 14 dB in the 10 ~ 15 Km, and 35, 18 dB in the 15 ~ 20 Km. By applying the correction factors, the appropriate partial path loss models for the measured Russain area are proposed.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.39C no.4
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• pp.326-333
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• 2014

Internet Services have security issues. To prepare proper security measures for these security issues, security level setting is positively necessary. Until now, we use a security level with CIA (Confidentiality, Integrity, and Availability) Security Levels. However, CIA Security Levels has problems with ambiguous measures for the middle level of security setting. Moreover, security level overlap occurs, in some cases, when user authentications are not done. Additionally, there exist some levels among CIA Security Levels which cannot be applied to Internet services. In this paper, new security level model, CIAA Security Levels with deletion of ambiguous middle level of security setting and addition of authentication to one of security level setting factors, is proposed. The CIAA Security Levels model can be applied to more concrete security measures than CIA Security Levels. The proposed Security Levels model is applicable to almost any on-line services and it can be applied to new online services.

• Proceedings of the Korea Society for Energy Engineering kosee Conference
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• 1993.11a
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• pp.73-77
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• 1993

박막모델을 사용하여 연료전지 성능에 영향을 주는 여러 인자들에 대해 전압과 전류의 관계를 모사 하여 비교하였다. 또한 단위전지에 대해 제어루프를 구성함으로서 전극성능 모델식을 이용한 연료전지의 제어 가능성을 확인하였다. 확산계수가 증가할수록 그리고 전극두께가 얇고 전극의 세공반경이 클수록 전극성능은 증가하였다. 단위전지의 제어를 위해서 양극과 음극의 반응기체 유속을 조절할 수 있는 압력에 대해 설정치 변화와 외란의 변화에 대한 제어모사를 행한 결과 각 전극의 압력이 설정점에 빠르게 수령하여 연료전지의 효과적인 제어가 가능함을 검증하였다.