• Journal of Korea Multimedia Society
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• v.7 no.7
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• pp.905-912
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• 2004

It is a study LVMPD to solve the fairness problem of inter-session shared bandwidth. Whenever congestion occurs in one session, the highest layer is dropped. Also the highest layer of other sessions in non-congestion is dropped by iner-session fairness. While there is spare bandwidth, receivers of session in non-congestion can't use bandwidth efficiently. In this paper, we proposed a distribution method to use efficiently spare bandwidth that occurred by inter-session fairness. In our method, we considered the highest layer those receivers receiving and the higher layer those receivers requesting. The sender assigns the packet-deleting priority to packets when congestion occurs in receivers, and sets layer add/drop flag when receivers of session in non-congestion request the higher layer. The switch deletes packets with packet-deleting priority and transfers packets with layer add/drop flag for session in non-congestion. Therefore receivers of session in non-congestion can add the higher layer. In experimental results, it was known that proposed algorithm use the inter-session shared bandwidth more effectively compared with already known method.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.29 no.2
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• pp.128-137
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• 2018

In this paper, we propose a novel class separability measure for radar signals. To reduce the sensitivity of the relative aspect angle between a target and radar, to evaluate the discriminatory power of radar signals, the proposed method first calculates the correlation coefficients between two radar cross sections (RCSs) or linearly shifts one-dimensional (1D) radar signals (i.e., high-resolution range profiles (HRRPs)), or rotates two 2D radar signals (i.e., inverse synthetic aperture radar (ISAR) images). Then, it uses the maximum correlation coefficient when two radar signals are best aligned. Next, the proposed method obtains new correlation-based discriminant matrices (CDM) using maximum correlation coefficients. Finally, the cumulative distribution function (CDF) in the CDM and the value corresponding to the specific probability in the CDF are obtained, and this value represents the discriminatory power of the radar signal. Experimental results show that the proposed method can accurately measure the target separability.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.8 no.6
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• pp.1428-1442
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• 2007

Nowadays, as IT environment is changing rapidly, traditional infra system such as hardware, software, and development methodology are changing as well. Legacy system has been filled with Intellectual property such as invested budget and development period for the time of IT is developing. Many countries around the world are having troubles with how to manage the legacy system. It is time to study on a development method and the implementation of supporting tool to reuse or process the legacy system. In this paper, it proves the definition, concept and also background of legacy system by showing real market and technology trend. Developed to handle the concrete development methodology, procedure and reference. We can get more profitability and productivity advance by reuse of legacy system and maintenance cost-saving through legacy migration.

• The KIPS Transactions:PartD
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• v.14D no.7
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• pp.763-772
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• 2007

Due to increased software development cost, interest about the method and automated tool for reusing legacy system have been running high. Therefore, In this study, it proves the definition, concept and also background of legacy system by showing real market and technology trend. Automation tool is designed and developed to handle the concrete development methodology, procedure and reference. Also, we implemented the process that analyze the legacy system and extract, refine, store and reuse the candidate components by using LM(Legacy to Modern System) supporting tool presented in this paper. If LM supporting tool is applied to legacy system migration, we can expect cutting costs, shortening the developing period and succeeding the intellectual property by software re-engineering.

• Journal of the Korean Society for information Management
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• v.26 no.1
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• pp.35-55
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• 2009

IR(Institutional Repository) is an indispensable instrument for not only long time preservation of intellectual products but also for shifting commercial publishing company-dominated academic communication stream. In Korea, dCollection project of Ministry of education, science and technology has contributed on immediate, integrated circulation of distributed research products. dCollection is already one of the few integrating instrument for distributed academic resources, but it has not been university's voluntary instrument to announce their research accomplishments and to realize open access. On the other hand, Japanese government has promoted universities' IR operation through "Next generation infrastructure construction project." Even though distributing speed is relatively low, each university made ripe operating skill by their selves and realize its own purpose. This study comparatively analyzed policy and current status of Institutional Repository in Korea and Japan from various viewpoints. And also it proposed directions of development about Korean Institutional Repositories.

• Journal of the Korea Institute of Military Science and Technology
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• v.25 no.3
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• pp.239-250
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• 2022

In this paper, we analyze the performance of an FM radio based passive radar in the presence of deception jamming such as false-target generation. To do this, we examine the effects of applying the deception jamming signal to the passive radar through the derivation of the construction of the amplitude-range-Doppler(ARD) plot. The analysis results show that applying the deception jamming signal with the low power similar to the target echo signal generates false targets at positions set by the jamming variables compared to the real target position in the ARD plot. Also, it is possible to induce the jamming effect so that only false targets are detected by selecting appropriate jamming power. Simulations are included to verify the theoretical results and to discuss on the effectiveness of the deception jamming on the FM radio based passive radar.

• The Journal of the Convergence on Culture Technology
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• v.8 no.5
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• pp.547-552
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• 2022

In this study, shape-based track management by analyzing track irregularity was studied in terms of force-based track irregularity analysis by numerical analysis of wheel-rail interaction force using by the measured vertical irregularity. The effect of the vertical irregularity of the track due to the difference in track types on the wheel-rail interaction force and the track acceleration in the connecting section of the sleeper floating track and the direct fixation track on concrete bed were analyzed. As the results of this study, the measured vertical irregularity was directly affect the vertical wheel load (the wheel-rail interaction force) and the rail acceleration, and it has been demonstrated to change consistently. In this study, the adequacy and necessity of the force-based track irregularity analysis method was verified based on the wheel-rail interaction analysis using the the measured vertical irregularity.

• Defense and Technology
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• no.6 s.232
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• pp.42-59
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• 1998

이제까지 레이다 시스템 기술과 레이다와 직간접으로 관련된 기술에 대한 발전방향과 동향에 대해 알아보기 위해 레이다의 발달 배경과 발전사를 살펴보았다. 또한 레이다가 광범위하게 사용되고 있는 것에 대한 설명과 현재 위상배열레이다의 기술수준을 가늠하기 위한 대표적 모델을 알아보았다. 이번호에서는 위상배열레이다 시스템 및 기술개발 동향에 대해 소개한다.

• Defense and Technology
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• no.5 s.171
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• pp.60-67
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• 1993

3차원 레이다는 거리, 방위각 및 고도에 대한 3차원 첩보를 확보함으로써 신속하고 정확한 표적 탐지 및 추적은 물론 기능 및 운용에서도 2차원 레이다 보다 유리합니다. 현재 우리는 2차원 레이다의 국내개발을 통해 전지역 대공 감시를 수행하려는 시점에서 이른 감이 있지만, 장차 국내 레이다 기술발전 및 방공무기의 국내개발과 대공무기체계의 효율성을 고려하면 3차원 레이다에도 관심을 기울여야 합니다

• Defense and Technology
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• no.5 s.231
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• pp.66-75
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• 1998

이제까지 레이다 시스템 기술과 레이다와 직간접으로 관련된 기술에 대한 발전방향과 동향에 대해 알아보기 위해 레이다의 발달 배경과 발전사를 살펴보았고 또한 레이다가 광범위하게 사용되고 있는 것에 대해 설명하였다. 이번 호에서는 현재 위상배열레이다의 기술수준을 가늠하기 위해 대표적 모델을 소개한다.