• 한국정보통신학회논문지
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• 제2권4호
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• pp.593-601
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• 1998

본 논문은 지역적으로 분산된 환경하에서 공동작업 및 데이터 회의 등이 가능하도록 하기 위하여 특정 시스템에 있는 개인 사용자 전용의 어플리케이션 프로그램을 다수의 사용자들이 실시간으로 공유할 수 있도록 하는 어플리케이션 공유 방법을 제안한다. 이를 위해 GUI(Graphical User Interface) 공유 방법에 관한 연구 현황을 살펴보고 GDI(Graphic Device Interface) 훅킹(hooking) 기법에 의한 GUI(Graphical User Interface) 공유방법을 제시하고 윈도우즈95 시스템 환경에서 GDI 라이브러리를 사용한 GDI 훅킹 모듈을 설계, 구현한다.

• Journal of Communications and Networks
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• 제16권2호
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• pp.110-120
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• 2014

This article proposes a spectrum sharing method which can avoid the mutual interference in both primary and secondary systems. The two systems make them a priority to use two single-dimension orthogonal signals, the real and imaginary pulse amplitude modulation signals, if the primary system is not in outage with this use. A secondary transmitter is selected to be the primary relay and the active secondary source to perform this. This allows a simultaneous spectrum access without any mutual interference. Otherwise, the primary system attempts to use a full two-dimensional signal, the quadrature amplitude modulation signal. If there is no outage with respect to this use, the secondary spectrum access is not allowed. When both of the previous attempts fail, the secondary system is allowed to freely use the spectrum two whole time slots. The analysis and simulation are provided to analyze the outage performance and they validate the considerable improvement of the proposed method as compared to the conventional one.

• 한국시뮬레이션학회논문지
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• 제2권1호
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• pp.91-106
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• 1993

Load sharing in distributed systems improves systems performance. Research in the field has been focused on steady state performance for load sharing algorithms. However, transient characteristics of such algorithms may be important in a distributed system in which workload for some node is changing. Simulation is the only means to analyze such characteristics. This paper presents a simulation-based analysis of the transient characteristics of four load sharing algorithms ; forward probing, reverse probing, symmetric probing, and multi-threshold symmetric probing algorithms. Discrete event system models for execution of the algorithms in a distributed system has been developed in a SIMSCRIOT II.5 environment. Simulation results indicate that the MSYM algorithm shows the shortest response time in the transient period.

• Journal of Communications and Networks
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• 제4권3호
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• pp.209-220
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• 2002

In this paper, we propose a hierarchical packet scheduling technique to closely approximate a hierarchical extension of the generalized processor sharing model, Hierarchical Generalized Processor Sharing (H-GPS). Our approach is to undertake the tasks of service guarantee and hierarchical link sharing in an independent manner so that each task best serves its own objective. The H-GPS model is decomposed into two separate service components: the guaranteed service component to consistently provide performance guarantees over the entire system, and the excess service component to fairly distribute spare bandwidth according to the hierarchical scheduling rule. For tight and harmonized integration of the two service components into a single packet scheduling algorithm, we introduce two novel concepts of distributed virtual time and service credit, and develop a packet version of H-GPS called Hierarchical Fair Queueing (HFQ). We demonstrate the layerindependent performance of the HFQ algorithm through simulation results.

• 한국BIM학회 논문집
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• 제12권1호
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• pp.72-80
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• 2022

It has become mandatory to designs by BIM in construction. It is urgent to make accurate decisions through the linkage between complex and various types of data in projects. In particular, block-chain based data sharing process (using BIM files, general construction submitted files) is essential to support reliable decision making in complex data flood systems. Prior to developing data sharing system based on block-chain, in this paper, a data linkage method is proposed so that practitioners can simultaneously utilize existing construction information and BIM data. Examples are shown based on the construction classification system and file expression, and incentive strategies are explored through a survey so that heterogeneous information can be used at the same time in overall projects.

• 정보관리학회지
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• 제40권1호
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• pp.225-258
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• 2023

본 연구는 국내 연구자가 저술한 논문의 데이터 가용성 진술(DAS)에 명시된 데이터 공유 메커니즘과 리포지터리를 조사함으로써 국내 연구자의 연구데이터 공유 현황과 특징을 탐구하는 것을 목적으로 한다. 이를 위하여 2014년부터 2022년까지 PLOS ONE에 게재된 국내기관 소속 연구자의 논문을 연구의 대상으로 선정하였다. 우선 논문 내 DAS 존재 현황을 파악하고 선행연구를 활용하여 데이터 공유 메커니즘의 유형을 분석하였으며, 시간의 흐름에 따른 데이터 공유 메커니즘별 변화 추이 등을 조사하였다. 그 결과, 대상 논문의 99.6%에 DAS가 작성되어 있으며 데이터 공유 메커니즘의 유형별 언급 양상은 국제적인 양상과 유사하되, 시간의 흐름에 따라 선호되는 유형이 변화하고 있음을 파악하였다. 이후 데이터 공유 메커니즘 중 리포지터리에 주목하여 DAS에 언급된 리포지터리의 횟수와 비율을 파악하고 다수 언급된 5개 리포지터리의 이용 변화 추이를 시계열적으로 분석하였다. 또한 리포지터리와 함께 언급된 데이터 접근점의 제시 방식과 유형, 유효성 등도 함께 조사하였다. 이를 통해 빈번하게 언급되는 상위 5개 리포지터리가 전체 리포지터리 언급의 60%를 차지하며 데이터 코드를 다루는 리포지터리의 이용이 증가하는 현황이 확인되었고, 리포지터리와 함께 제시된 데이터의 접근점은 대부분 유효하다는 사실을 파악할 수 있었다.

• 품질경영학회지
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• 제46권3호
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• pp.411-424
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• 2018

Purpose: The purpose of this study is to improve submarine TACM launcher system safety device performance. Methods: In this study, EPLD(Electrically Programmable Logic Device) control and time sharing method to the safety device actuator motor and discrete signal processor in launch control panel were used to resolve unusual performance of safety system. Results: The result of this study are as follows; First, sporadic stopping of safety device actuator motor due to insufficient In-Rush current was resolved. Second, repeat of safety device condition as lock & release due to chattering for motor activating was resolved. Third, simultaneous release function for safety device actuator was available. Conclusion: The unusual performance of function for submarine TACM launcher system was overcame by applying EPLD control and time sharing method. The suggestions were proved by performance test in the pressure chamber. The results of this study enhanced survivability of ${\bigcirc}{\bigcirc}{\bigcirc}$ class submarine from enemy torpedo.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제11권9호
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• pp.4220-4241
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• 2017

For the downlink energy-harvesting small cell network, this paper proposes an interference management algorithm based on distributed coalitional game. The cooperative interference management problem of the energy-harvesting small cells is modeled as a coalitional game with transfer utility. Based on the energy harvesting strategy of the small cells, the time sharing mode of the small cells in the same coalition is determined, and an optimization model is constructed to maximize the total system rate of the energy-harvesting small cells. Using the distributed algorithm for coalition formation proposed in this paper, the stable coalition structure, optimal time sharing strategy and optimal power distribution are found to maximize the total utility of the small cell system. The performance of the proposed algorithm is discussed and analyzed finally, and it is proved that this algorithm can converge to a stable coalition structure with reasonable complexity. The simulations show that the total system rate of the proposed algorithm is superior to that of the non-cooperative algorithm in the case of dense deployment of small cells, and the proposed algorithm can converge quickly.

• Journal of Communications and Networks
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• 제16권2호
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• pp.140-145
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• 2014

In this paper, we propose an anti-interference cooperative spectrum sharing strategy for cognitive system, in which a secondary system can operate on the same spectrum of a primary system. Specifically, the primary system leases a fraction of its transmission time to the secondary system in exchange for cooperation to achieve the target rate. To gain access to the spectrum of the primary system, the secondary system needs to allocate a fraction of bandwidth to help forward the primary signal. As a reward, the secondary system can use the remaining bandwidth to transmit its own signal. The secondary system uses different bandwidth to transmit the primary and its own signal. Thus, there will be no interference felt at primary and secondary systems. We study the joint optimization of time and bandwidth allocation such that the transmission rate of the secondary system is maximized, while guaranteeing the primary system, as a higher priority, to achieve its target transmission rate. Numerical results show that the secondary system can gain significant improvement with the proposed strategy.

• 한국통신학회논문지
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• 제30권12C호
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• pp.1201-1207
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• 2005

전자전장비는 송수신기간의 이격이 충분하지 않을 경우, 송신기에서 방사된 잡음재밍신호는 수신기로 피드백되어 레이더 펄스신호의 수신을 방해한다. 이로 인해, 동일 주파수 대역내에서 펄스재밍과 잡음재밍을 동시에 수행할 수 없다. 본 논문에서 펄스열의 예측게이트를 이용하여 잡음재밍신호를 차단하고 동시에 해당 채별 필터를 동작시켜 레이더 펄스신호를 수신할 수 있는 스위치 메트릭스를 이용한 시분할 송수신 제어기법을 제안한다. 이 기법은 전자전장비의 EPLD 내에 구현되어 실험을 통해 확인되었으며, 다중 재밍환경에서도 동시에 펄스재밍과 잡음재밍을 가능하도록 해준다.