• 전기학회논문지
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• 제61권6호
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• pp.859-864
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• 2012

The computer network plays an important role in modern digital controllers within a safety system of a nuclear power plant. For the reliable and realtime data communication between controllers, this paper proposes a modified high-reliable MVB(multi-function vehicle bus) as a main control network for a safety system of a nuclear power plant. The proposed network supports the state-based communication in order to ensure the deterministic communication latency, and very fast network recovery when the bus master fails compare to the standard MVB. This paper also shows the implementation results using a FPGA-based testbed.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제10권5호
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• pp.2218-2244
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• 2016

In this paper, we propose a hybrid routing scheme that utilizes location information to support reliable data transmission in mobile ad hoc networks. The proposed scheme determines and maintains routing path by considering the directionality and connectivity of nodes using grid zones and information on neighbor nodes. In addition, it generates alternative paths with consideration for node distance and reliability. To show the superiority of the proposed routing scheme, a performance evaluation was conducted using simulations. The performance evaluation results show that the proposed scheme offers faster and more reliable data transmission than the existing routing schemes, and the number of messages decreases by approximately 31% compared to the existing schemes on average.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2000년도 추계학술대회 논문집
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• pp.594-601
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• 2000

Communication Based Train Control System supports the easy maintenance ＆ management and also have the capability to send more informations than the existing one but is less expensive. Tolerance against fault/failure and reliable data transmission are very important issues with this system since it has the responsibility of man's safety. In this paper, we suggested the schemes to support the reliable transmission quality and fault safety. Also we verified through simulation.

• Journal of Information Processing Systems
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• 제13권6호
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• pp.1602-1612
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• 2017

Since rapidly disseminating of Internet of Things (IoT) as the new communication paradigm, a number of studies for various applications is being carried out. Especially, interest in the smart medical system is rising. In the smart medical system, a number of medical devices are distributed in popular area such as station and medical center, and this high density of medical device distribution can cause serious performance degradation of communication, referred to as the coexistence problem. When coexistence problem occurs in smart medical system, reliable transmitting of patient's biological information may not be guaranteed and patient's life can be jeopardized. Therefore, coexistence problem in smart medical system should be resolved. In this paper, we propose a distributed coexistence mitigation scheme for IoT-based smart medical system which can dynamically avoid interference in coexistence situation and can guarantee reliable communication. To evaluate the performance of the proposed scheme, we perform extensive simulations by comparing with IEEE 802.15.4 MAC protocol which is a traditional low-power communication technology.

• 한국시뮬레이션학회논문지
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• 제7권1호
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• pp.1-14
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• 1998

In this paper, we propose an efficient network communication scheme tailored to the network virtual reality(NVR) system. We first present the architecture and implementation of CVRAT (collaborative virtual reality authoring tool). The design goal of CVRAT is to provide consistent and scalable shared virtual environments. To achieve this goal, we classify the network messages according to their reliability and latency requirements. These conflicting requirements lead us to conceive a heterogeneous communication scheme which provides the unicast and three different multicast transport services; unreliable multicast, receiver-driven reliable multicast, fast reliable multicast. Each protocol has trade-offs in reliability, latency and bandwidth usage. The characteristics are analyzed by several experiments. Finally, applying this communication method to multi-participant battle-field tank simulation, we show the efficacy of proposed heterogeneous transport mechanism.

• ETRI Journal
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• 제29권6호
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• pp.745-754
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• 2007

In this paper, we present the Enhanced Communication Transport Protocol-Part 5 (ECTP-5), which provides scalable and reliable multicast communication service for many-to-many applications by constructing high quality recovery trees from two-layer logical trees and repairing the losses via unicast automatic repeat request-based error control. In order to realize the protocol, we developed feasible protocol architectures and building blocks including additional functions which deal with engineering details, such as membership dynamics and sender coordination. Experimental results show that ECTP-5 scales well with various session sizes and packet loss rates in terms of control overhead and recovery latency.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2001년도 하계학술대회 논문집 D
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• pp.2741-2743
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• 2001

The railway signaling systems are computerized vital equipments for safety guarantee of train running. And also it is important to prepare the reliable communication link between signalling equipments. In this paper the review of signalling communication protocol used at current railway signalling is presented and basic line for reliable protocol structure is represented. And also the direction for our further study on these is discussed.

• 한국정보처리학회:학술대회논문집
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• 한국정보처리학회 2011년도 추계학술발표대회
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• pp.665-667
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• 2011

최근에 에너지 효율적이며 신뢰성 있는 데이터 전송을 보장하기 위한 많은 라우팅 기법의 연구가 진행되고 있다. 하지만 현재까지 무선센서네트워크에서의 표준 라우팅 기법이 없는 상황에서 신뢰성을 제공하기 위한 새로운 라우팅 기법을 제안하는 것은 실용적이지 않으며 비효율적이다. 본 논문에서는 신뢰성 있는 데이터 전송을 범용적으로 보장하기 위해서 기존의 라우팅 기법의 신뢰성 및 확장성을 제공하는 모듈기법인 DRDT(Delay-based Reliable Data Transmission)를 향상시킨 ADRDT(Advenced Delay-based Reliable Data Transmission) 기법을 제안한다. ADRDT는 수신노드가 불안정한 링크상태로 인해 데이터 수신을 실패하는 경우 데이터를 오버히어링한 헬퍼노드(helper node)의 협력적인 재전송을 통해 신뢰성을 제공한다. 헬퍼노드는 수신노드의 이웃노드가 데이터를 오버히어링할 때 딜레이를 이용한 분산적 방법을 통해 동적으로 선정되며, 수신노드와의 링크상태를 고려하기 때문에 효과적으로 재전송 횟수를 감소시킨다. 제안 기법은 기존 기법과 비교해 전송 비용을 약 16.5% 감소시킨다.

• Journal of information and communication convergence engineering
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• 제10권2호
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• pp.141-148
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• 2012

This paper presents a simple but efficient scheme incorporating a reputation-based approach and a cross-layer approach, called the SIM scheme, for maintaining reliable connectivity and high performance in ad-hoc wireless networks. The SIM scheme incorporates the following two things: an ad-hoc routing scheme with a reputation-based approach exploiting the game theory concept based on an evolutionarily stable strategy, and a cross-layer approach between the network layer and the transport layer employing a reputation-based approach.

• 한국시뮬레이션학회논문지
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• 제15권3호
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• pp.69-77
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• 2006

여기에 지오캐스팅(geocasting)이란 어떤 특정한 지역(지오캐스트 영역이라 함)에 있는 모든 노드들에게 데이터를 전송하는 통신형태이다. 기존의 에너지 관련 프로토콜은 주로 통신 경로 설정 시 주로 최소 홉 수, 즉 전송 에너지를 최소화하기 위한 최단거리 관점에서 최적의 경로를 구하며, 각 노드의 잔여 에너지와 링크 에러율에 대해 고려하지 않는 것이 대부분이다. 본 논문에서는 ad-hoc 네트워크에서 에너지 효율적이고 신뢰성 있는 전송을 하기 위한 지오캐스팅 방법인 MLRG를 제안한다. MLRG는 위치기반과 라우팅-기반인 지오캐스팅으로 각 노드의 잔여 전력을 파악한 경로 탐색과 새롭게 제안하는 cost 관계식을 통해 네트워크 활동시간을 최대화하고, 링크의 에러율도 고려하여 신뢰성 있는 통신이 가능하다.