• The Journal of Korean Institute of Communications and Information Sciences
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• v.35 no.3B
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• pp.390-397
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• 2010

This paper presents an effective IPTV channel control algorithm considering network utilization and channel zapping time. The proposed algorithm keeps maximum average channel zapping time of each subscriber in the tolerable range with low network bandwidth usage by adjusting the type of each channel and the number of additional intra frames inserted into each channel. Finally, experimental results are provided to show the performance of the proposed algorithm.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.10 no.6
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• pp.1032-1037
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• 2006

The channel is one of the precious and limited resources in wireless networks. There are many researches on the channel management. Recently, the optimization problem of guard channels has been an important issue. In this paper, we propose an intelligent channel management technique based on the neural networks. An SRN channel allocation model is developed to generate the learning data for the neural networks and the performance analysis of system. In the proposed technique, the neural network is trained to generate optimal guard channel number g, using backpropagation supervised learning algorithm. The optimal g is computed using the neural network and compared to the g computed by the SRM model. The numerical results show that the difference between the value of 8 by backpropagation and that value by SRM model is ignorable.

• Proceedings of the Korea Institute of Convergence Signal Processing
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• 2003.06a
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• pp.230-233
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• 2003

ATM 트래픽 관리의 목적은 호 설정시 요구하는 QoS를 충족시키는 것과 최소한의 망 자원을 이용하면서 망을 보호하는 것이다. 또한, 서로 다른 채널간 QoS을 공정하게 보장하는 것이 필요하다. 본 논문에서는 채널들간에 공정한 QoS 제공과 링크 이용률을 높이기 위하여 입력버퍼에 문턱값을 기반으로 출력 셀율을 동적으로 조정하는 새로운 TBBM(threshold based buffer management)알고리즘을 제안하였으며 문턱값 변화에 따른 성능을 분석하였다.

• Journal of the Institute of Convergence Signal Processing
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• v.5 no.1
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• pp.79-83
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• 2004

The purpose of ATM traffic management is to protect the network using minimum resources and guarantee the requred QoS and also it is desirable to provide fairness between input channels. In this paper, we propose the TBBM(threshold based buffer management) algorithm to improve fairness between input channels and utilization of ATM networks. TBBM algorithm controls output cell rate dynamically based on threshold. The result shows that the required bandwidth of the TBBM algorithm is 14.3% lower in audio traffic and 41.8% lower in video traffic than that of theoretically calculated equivalent capacity method. and also reveals that the TBBM algorithm provide improved CLR fairness between input channels

• The Journal of Korean Institute of Communications and Information Sciences
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• v.32 no.2A
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• pp.179-187
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• 2007

As wireless networks evolve to orthogonal frequency division multiple access(OFDMA) systems, inter-cell interference control becomes a critical issue in radio resource management. The allocation of the same channels in neighbor cells cause inter-cell interference, so the channel allocation needs to be taken carefully to lower the inter-cell interference. In distributed channel allocation, each cell independently tries to allocate channels that suffer low interference level. In this paper, under the assumption of static users, we introduce the concept of interference range and use it in designing our two algorithms; basic and combined. The basic algorithm performs interference range detection and determines whether to use the considered channel, while the combined algorithm checks the channel quality in addition to detecting the interference range. The two algorithms dynamically perform channel allocation with low complexity and show good throughput and fairness performance.

• Proceedings of the Korea Information Processing Society Conference
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• 2001.10a
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• pp.267-270
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• 2001

본 논문에서는 이동통신망에서의 효율적인 인과순서 알고리즘을 채널전환 알고리즘과 함께 제안한다. 인과순서를 유지하기 위해서는 순서를 유지하기 위한 제어정보를 교환하여야 하며, 송수신 양측은 메시지를 보내거나 받은 전후에 각각의 제어정보를 수정하여야 한다. 특히 이동유닛이 다른 셀로 이동한 경우, 채널전환 프로토콜은 기존의 기지국과 새로운 기지국에서 동시에 제어정보 관리를 위한 작업을 수행하여야 하며, 기존의 기지국에 있는 이동 유닛의 제어정보는 새로운 기지국으로 전달되어야 한다. 따라서 제어정보의 크기가 채널전환시간과 메시지 지연시간에 직접적인 영향을 주기 때문에, 전송되는 제어정보의 양을 최소화하여야 한다. 본 논문에서는 제어정보의 양을 줄이기 위하여 유효한 통신패턴을 분석하여 중복으로 교환되는 제어정보가 최소화되는 인과순서 알고리즘을 제안하였으며, 모의실험을 통하여 제안된 알고리즘이 기존의 알고리즘에 비해 효율적임을 보였다.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2006.05a
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• pp.115-119
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• 2006

The channel is one of the precious and limited resources in wireless networks. There are many researches on the channel management. Recently, the optimization problem of guard channels has been an important issue. In this paper, we propose an intelligent channel management technique based on the neural networks. An SRN channel alteration model is developed to generate the learning data for the neural networks and the performance analysis of system. In the proposed technique, the neural network is trained to generate optimal guard channel number g, using backpropagation supervised learning algorithm. The optimal g is computed using the neural network and compared to the g computed by the SRN model. The numerical results show that the difference between the value of g by backpropagation and that value by SRN model is ignorable.

• Proceedings of the Korea Information Processing Society Conference
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• 2014.04a
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• pp.149-151
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• 2014

DVB-S2/RCS (Digital Video Broadcasting - Satellite/Return Channel via Satellite)는 위성 방송 및 데이터 통신을 위한 표준으로서 높은 통신 품질 및 향상된 위성 자원 이용을 위해 수립되었다. DVB-RCS 의 MF-TDMA (Multi-Frequency Time Division Multiple Access)는 동적인 자원할당이 가능하며, 이에 따라 통신 요구 사항이 증가하는 군 위성 통신 체계로의 적용 연구가 활발하게 진행 중이다. 그러나 기존 MF-TDMA 위성 통신은 군 통신에 필수적인 항재밍에 대한 고려가 부족한 실정이다. 부분대역 재밍시, 다구의 RCST (Return Channel Satellite Terminal)에 통신 저하를 초래 할 수 있으며, 망 자원을 관리하는 제어 채널의 재밍으로 다수 RCST 의 채널 탈퇴를 초래할 가능성이 있다. 본 논문에서는 부분대역 재밍 시 RCST 의 통신 저하를 최소화하며, 제어 채널 재밍으로 인한 다구 RCST 의 채널 탈퇴를 예방하는 자원할당 알고리즘을 제안한다. 제안 기법은 다양한 대역폭을 지원하는 MF-TDMA 에 적용 가능함으로써 다양한 장비가 혼재하는 군사 환경에 매우 적합하다. 시뮬레이션을 통해 제어 채널의 재밍 확률과, RCST 의 자원할당 효율을 기존 자원할당 알고리즘과 비교하였으며, 제안한 알고리즘이 우수한 성능을 보임을 확인 하였다.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2023.05a
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• pp.282-283
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• 2023

항로표지 부이의 안전한 관리 및 해사 안전 서비스 제공을 위한 4채널 카메라 시스템 하드웨어를 구현하고, 항로표지 부이 근접 선박 감지, 해무 강도 측정, IMU 센서를 이용한 파고 측정 알고리즘을 구현하여 육상으로 전달하는 기능을 개발하였다

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2014.10a
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• pp.624-627
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• 2014

In vehicular network, the basic goal is to provide vehicle safety service and commercial service such as ITS(Intelligent Transportation System) or video, etc on the road. And most research concentrated on transportation of safety message in congestion situation. It is important to allocate channel for safety message in congestion situation, but providing suitable service is also important problem in vehicular network. For this reason, IEEE 1609.4 allocate 4 multiple service channels (SCHs) for non-safety data transfer. But, in congestion situation with many vehicles, the contention for channel acquisition between services becomes more severe. So services are provided improperly because of lack of service channel. This paper suggests dynamic channel allocation algorithm. The proposed algorithm is that RSU(RaodSide Unit) maintain and manage the information about service and status of channels. On based of the SJF(Shortest Job First) scheduling using those information, RSU selects the most appropriate channel among the 4 SCHs allocated by IEEE 1609.4 in network congestion situation.