• Proceedings of the Korean Information Science Society Conference
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• 2004.10c
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• pp.160-162
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• 2004

홈네트워크 연구그룹의 표준 중 하나인 OSGi는 OSGi Alliance에서 정의한 표준 서비스 분배 방식이다. 본 논문에서는 이동 에이전트를 OSGi 기반의 홈네트워크에서 연동하기 위해 OSGi 표준의 번들 라이프 사이클을 수정하여 이동 에이전트 시스템은 지원하는 방법을 제안한다. 이동 에이전트는 뛰어난 이식성과 효율적인 관리의 장점에도 불구하고 보안의 문제로 사용이 제한되어 왔다. 홈네트워크는 서비스 분배에서 가입자와 서비스 분배자 사이의 폐쇄적인 구조를 가지고 있기 때문에 이러한 보안상의 취약점은 해결할 수 있다. 따라서 홈 네트워크 환경에서 이동 에이전트의 지원은 보다 효율적이고 지능화된 서비스를 가능하게 할 것이다. OSGi의 구조는 서비스를 분배하고 수행하기 위한 번들 라이프사이클을 제공한다. 별도의 에이전트 서버 번들을 구현하는 대신에 본 논문에서는 번들 라이프사이클에서 이동 에이전트가 직접 수행될 수 있는 번들 라이프 사이클을 제안한다.

• Journal of Digital Convergence
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• v.12 no.7
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• pp.11-20
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• 2014

This paper finds that the ultimate source of problems facing Korean mobile telecommunications such as excessive subsidies of handsets, waste of resources, and a vicious circle of expensive handsets and high prices for services, is bundling of handset and subscription. The analysis suggests that bundling causes consumers to confuse about prices of handsets and services, and firms focus on handset subsidy competition rather than on upgrading service qualities and lowering prices due to anti-competitive effects of bundling. Because most of the cost of bundling is passed on to consumers, the welfare of consumers decline. In particular, equality among consumers worsens due to price discriminations. To resolve these problems, unbundling of handset and subscription is a necessity. Mixed bundling allowing separate selling of handsets under bundling does not seem to work as a cure because bundling tends to be a dominant strategy. The best regulatory policy is a complete separation of handset and subscription.

• 한국정보통신설비학회:학술대회논문집
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• 2004.08a
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• pp.86-89
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• 2004

현재 센서 너트워크와 홈네트워크 분야에 대한 연구가 활발히 진행 중이다. 아직까지 센서 네트워크 분야는 기존의 네트워크 시스템에 연결된 형태의 연구가 많았고 홈 네트워크는 가전기기를 중심의 연구가 대부분이었다. 이런 문제를 해결하기 위해 센서네트워크를 관리할 수 있는 OSGi 기반의 서비스 미들웨어를 설계하였다. 서비스 미들웨어는 OSGi 프레임워크상에서 동작하며 센서 네트워크 시스템과 연동하기 위한 번들과 OSGi 프레임워크 사의 번들을 제어하는 관리 번들로 구성하였다.

• 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.

• Korean Journal of Remote Sensing
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• v.34 no.3
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• pp.565-578
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• 2018

In this paper, we investigate the feasibility of modelling image strips, instead of individual scenes, that have been acquired from the same orbital pass through the process of bundle adjustments. Under this approach, First, a rational function model (RFM) of the strip image is generated from the RFMs of individual images, such that the entire strip of images can be treated as a single image. Correction parameters are calculated through bundle adjustments between strip images. For the experiment, we used two stereo strips. Each strip image consists of three KOMPSAT-3A scenes. Experimental results show that it was possible to improve the initial model by using the control points located in a specific region of the strip. We showed that absolute orientation with moderate accuracy of 2 m errors were achieved from 12 ground control points for the three-image strips. The test results indicate that bundle adjustment of strip images could be more efficient than bundle adjustments of the individual scenes.

• Journal of the Computational Structural Engineering Institute of Korea
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• v.26 no.3
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• pp.199-205
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• 2013

In this study, the methodology for the fatigue life prediction using finite element method(FEM) in wire, bundle and assembly level of the wire harness system and the development of the fatigue life test machine for the numerical analysis are investigated. To obtain stress-life(S-N) histories of the componential wires of the system, five kinds of wires are prepared and applied to the repeated bending motion using developed fatigue life test equipment. Equivalent model of the wire from the rule of mixtures theory is used for the material modeling of sheath and wire core combination. Contact conditions among the wires, taping conditions are established through the bundle level test and numerical bundle analysis. Wire and bundle level results are adopted for the assembly level analysis. For the assembly level analysis, real wire harness system including bundle and grommet is numerically modeled and applied contact condition between wires with real opening motion. The fatigue life more than 700,000 cycles of the assembly is obtained from the FEM, and it is confirmed that the result has good agreement with the experimental result.

• Journal of KIISE:Computing Practices and Letters
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• v.10 no.3
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• pp.259-272
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• 2004

This paper suggests a new security architecture for facilitating secure OSGi service platform environment. The security architecture includes 1) user authentication mechanism, 2) bundle authentication mechanism, 3) key sharing mechanism, and 4) authorization mechanism. The user authentication mechanism supplies SSO(single sign-on) functions which are useful for safe and easy user authentications. The bundle authentication mechanism utilizes both PKI-based and MAC-based digital signatures for efficiently authenticating service bundles. The key sharing mechanism, which is performed during bootstrapping phase of a service gateway, supplies a safe way for sharing secret keys that are required for authentication mechanisms. Finally, the authorization mechanism suggests distributed authorization among service providers and an operator by establishing their own security policies. The main contributions of the parer are twofold. First, we examine several security requirements of current OSGi specification when its security functions can be applied in real OSGi environments. Second, we describe the ways to resolve the problems by means of designing and implementing concrete security mechanisms.

• Korean Journal of Construction Engineering and Management
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• v.10 no.1
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• pp.45-57
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• 2009

BTL (Build-Transfer-Lease) Project for Education Facilities are contracted as a package which consists of several education facilities. The general maintenance period of BTL project for education facilities is 20 years. Thus, total cost variation largely depends on the accuracy of the maintenance cost forecasting in the early stage in the life cycle of the BTL Project. This research develops a cost forecasting system using complete linkage algorithm and branch & bound algorithm to help in finding optimal bundling combination. This system helps owner's decision-making to estimate the total project cost with various constraints changing. The result of this research suggests more reasonable and effective forecasting model for the maintenance facilities package in the BTL project.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2007.10a
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• pp.105-108
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• 2007

In this paper, we have developed a UPnP-OSGi Bundle for digital convergence based on UPnP middleware. UPnP-OSGi bundle is demanded sustaining realtime monitering system based on UPnP middleware that is possible multimedia ability of a piece with a multiplicity of service and joint user data , service lifecycle , management division service for home network system offered convergence service. This bundle is possible a multiplicity of control and monitering service segmentation so develop a multiplicity of service is easy. and provide zero-configuration system.

• Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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• v.23 no.2
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• pp.137-145
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• 2005

In this paper, we investigate the accuracy of various sensor models developed for linear pushbroom satellite images. We define the accuracy of a sensor model in two aspects: the accuracy of bundle adjustments and the accuracy of estimating exterior orientation parameters. The first accuracy has been analyzed and reported frequently whereas the second accuracy has somewhat been neglected. We argue that the second accuracy is as important as the first one. The second accuracy describes a model's ability to predict satellite orbit and attitude, which has many direct and indirect applications. Analysis was carried out on the traditional collinearity-based sensor models and orbit-based sensor models. Collinearity-based models were originally developed for aerial photos and modified for linear pushbroom-type satellite images. Orbit-based models have been used within satellite communities for satellite control and orbit determination. Models were tested with two Kompsat-1 EOC scenes and GPS-driven control points. Test results showed that orbit-based models produced better estimation of exterior orientation parameters while maintained comparable accuracy on bundle adjustments.