• 한국정보처리학회:학술대회논문집
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• 한국정보처리학회 2001년도 춘계학술발표논문집 (하)
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• pp.623-626
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• 2001

본 논문에서는 별도 장비에 의하여 음성 서비스와 ADSL 인터넷 접속 서비스를 각각 제공하는 현재의 통신망 환경에서 음성 서비스와 ADSL 서비스를 한 시스템에서 모두 제공하는 통합 액세스 장비를 이용한 액세스 망의 패킷화 방법과, VoATM/IP 게이트웨이를 이용한 중계망을 패킷화 방법, 그리고 통합 액세스 장비, VoATM/IP Gateway 그리고 SoftSwitch를 결합하여 통신망 전체를 패킷화 하는 차세대 통신망 진화 전략을 비교한다. 또한 경제성을 최대로 활용한 통신망 진화 전략과 패킷화 도입에 따른 고려사항을 방법을 도출하고자 한다.

• 융합신호처리학회논문지
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• 제3권2호
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• pp.64-70
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• 2002

This paper proposes a new construction method of neural networks. The construction method consists of two fundmental ideas, which are a parallel selection-style evaluation and rules evolution. A new collision avoidance algorithm using genetic and neural network is proposed to avoid moving obstacles such as mobile robots. The input parameters of this algorithm is position of moving obstacles and target. Output is a regenerated direction of mobile robot. This algorithm is very simple and so, it is available to application of real time process. The pattern of collision avoidance is learned through test execution.

• Journal of Communications and Networks
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• 제4권4호
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• pp.314-320
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• 2002

The various sectors of the International Telecommunication Union (ITU) have been addressing the evolution of thirdgeneration and future wireless systems in the context of a comprehensive International Mobile Telecommunications 2000 (IMT-2000) project, and within the ITU’s Telecommunication Standardization Sector (ITU-T) a Special Study Group on “IMT-2000 and Beyond” has been established to address the network aspects of these emerging wireless systems. The Special Study Group (SSG) is playing a global role in this general area, in which a number of regional standards development organizations and a variety of industry forums are also active. This paper provides background information on the SSG and describes the SSG’s ongoing work addressing medium-term issues relating to convergence of fixed and mobile systems and the harmonization of evolving IMT-2000 systems. The paper also addresses related mobility management aspects.

• ETRI Journal
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• 제18권3호
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• pp.127-145
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• 1996

A new analytic framework based on a linear algebra approach is proposed for examining the performance of a direct sequence spread spectrum (DS/SS) slotted ALOHA wireless communication network systems with delay capture. The discrete-time Markov chain model has been introduced to account for the effect of randomized time of arrival (TOA) at the central receiver and determine the evolution of the finite population network performance in a single-hop environment. The proposed linear algebra approach applied to the given Markov problem requires only computing the eigenvector ${\prod}$ of the state transition matrix and then normalizing it to have the sum of its entries equal to 1. MATLAB computation results show that systems employing discrete TOA randomization and delay capture significantly improves throughput-delay performance and the employed analysis approach is quite easily and staightforwardly applicable to the current analysis problem.

• Journal of Electrical Engineering and Technology
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• 제7권3호
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• pp.288-296
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• 2012

The method proposed by the author is intended for assistance in decision-making (concerning changes of connections) by operators of complex distribution systems during states of malfunction (particularly in the events of malfunctions, for which the consequences encompass extended parts of the network), through designation of connection action scenarios (creating substitute configurations). It is the use by the classifying system working with the co-evolution algorithm that enables the effective creation of substitute scenarios for the Medium Voltage electric power distribution network. The author also completed works concerning the possibility of using cooperation of the evolutionary algorithm and the co-evolutionary algorithm with local search algorithms. The method drawn up may be used in current systems managing the work of distribution networks to assist network operators in taking decisions concerning connection actions in supervised electric power systems.

• 한국IT서비스학회지
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• 제7권1호
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• pp.131-149
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• 2008

Bandwidth Trading(BT) represents a potential market with over 1 trillion USD across the world and high growth potential. BT is also likely to accelerate globalization of the telecommunications industry and massive restructuring driven by unbundling rush. However, systematic researches on BT remain at an infant stage. This study starts with structure analysis of the Internet industry, and discusses significance of Internet interconnection with respect to BT Issues. We also describe the bandwidth commoditization trends and review technical requirements for effective Internet interconnection with BT capability. Taking a step further, this study explores the possibility of improving efficiency of network providers and increasing user convenience by developing an architectural prototype of Hub-&-Spoke interconnection model required to facilitate BT. The BT market provides an Innovative base to ease rigidity of two-party contract and Increase service efficiency. However, as fair, efficient operation by third party is required, this research finally proposes an exchanging hub named NIBX(New Internet Business eXchange).

• International Journal of Computer Science & Network Security
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• 제21권1호
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• pp.152-161
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• 2021

The paper focuses on Device-to-device (D2D) Architectures evaluation frameworks. D2D communication and discovery can improve spectrum usage efficiency and optimize the tradeoffs between throughput and energy consumption. The target operation modes involve both indirect communication between two nodes via a base station or the direct communication among proximal nodes, enabling use cases that can support communications out of cellular coverage, as well as low end-end delay requirements. The paper will present the architectural evolution of D2D networks within 3GPP standardization and will highlight key network functionalities and signaling protocols. It will also identify key analytical and simulation models that can be used to assess the performance and energy efficiency of resource allocation strategies, and it will present a suitable cross-layer integrated framework.

• International Journal of Computer Science & Network Security
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• 제22권4호
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• pp.351-357
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• 2022

LTE (Long-Term Evolution, sometimes known as 4G LTE) is a wireless high-speed data communication technology for mobile phones and data terminals. The Packet Scheduler (PS) is an important component in improving network performance. Physical Resource Blocks (PRBs) are assigned to associated User Equipment by the packet scheduler (UEs). The primary contribution of this study is a comparison of the eNodeB throughput between a suggested method and the Round Robin (RR) Algorithm. The RR Algorithm distributes PRBs among all associated UEs without taking channel circumstances into account. In this research, we present a new scheduling method that takes into account the number of PRBs and associated UEs and produces higher throughput than the RR algorithm.

• 디지털융복합연구
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• 제13권10호
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• pp.327-335
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• 2015

재난통신망은 TETRA(TErrestrial Trunked RAdio)에서 대용량 데이터 통신이 가능한 광대역 이동통신 기술인 Public Safety-LTE(Long Term Evolution) 자가망을 활용하는 방향으로 발전하고 있다. 국내에서는 재난재해 대응기관 간의 일원화된 통신체계 유지를 위해 재난안전통신망 구축사업을 추진하고 있으나, 재난재해 현장에 위치한 피해당사자와의 통신을 고려하지 않고 재난재해 대응기관 간 지휘통제를 중심으로 통신망을 구축하고 있다. 본 연구에서는 국내 재난통신망 구축동향과 해외 선진사례를 해석하여 전 범위 재난통신망 구축을 위한 쟁점을 도출하고 통신주체와 목적에 따라 재난통신 영역을 새롭게 정의하여 재난통신 영역을 통제통신, 대응통신, 현장통신, 당사자통신, 경보통신으로 세분화하였다. 본 연구를 통하여 재정의 된 재난통신 영역의 특성을 분석하고 이에 따른 핵심 품질요건을 재설계하여 영역별 음영지역 없는 전 범위 재난통신 체계 구축방안을 수립하였다.

• 대한전자공학회논문지TC
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• 제43권9호
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• pp.14-24
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• 2006

초기 지상파DMB(T-DMB)는 단방향 방송 서비스만을 제공하였으나, 최근에는 이동통신의 리턴채널을 이용한 양방향 데이터 서비스까지 제공한다 T-DMB는 텔레매틱스, RFID 등과 같은 이질적인 응용서비스와 통합된 서비스를 제공하는 형태로 진화될 것으로 예측된다. 이러한 관점에서 T-DMB 플랫폼에서 다양한 텔레매틱스 및 RFID 응용들을 지원할 수 있는 프레임 워크가 정의되어야 한다. 본 논문에서는 T-DMB가 양방향 인터렉티브 통신을 제공하는 환경에서, 교통정보 서비스, 콘텐츠 서비스와 같은 REID 응용서비스를 제공할 수 있는 통합 서비스 모델을 제안하였다. 실현을 위해 서비스 시나리오, 네트워크 참조 모델, 각 엔티티의 기능, 데이터 전송 방법, 메시지, 코딩 규칙을 설계하였다. 제안한 모델은 RFID 리더 기능이 없는 T-DMB 단말상에서, FRID 응용서비스를 동일하게 제공받을 수 있다. 또한, TPEG-Location 응용을 이용하므로 사용자의 위치를 기준으로 교통 및 여행자 정보(TTI) 서비스뿐만 아니라 주변에서 제공하는 모든 RFID 응용서비스를 이용할 수 있다. 메시지 구조는 TPEG 표준을 따라 설계하였다.