• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2005년도 추계종합학술대회
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• pp.869-872
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• 2005

In this paper we present a switch wrapper for an AMBA AXI, which is an efficient on-chip-network interface compared to bus-based interfaces in a multiprocessor SoC. The AXI uses an idea of NoC to provide the increasing demands on communication bandwidth within a single chip. A switch wrapper for AXI is located between a interconnection network and two IPs connecting them together. It carries out a mode of routing to interconnection network and executes protocol conversions to provide compatibility in IP reuse. A switch wrapper consists of a direct router, AHB-AXI converters, interface modules and a controller modules. We propose the design of a all-in-one type switch wrapper.

• 한국컴퓨터정보학회논문지
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• 제21권1호
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• pp.65-72
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• 2016

Network virtualization is an emerging technology for solving the rigidity of the physical network infrastructure. The innovative technique virtualizes all resources in the network, including the network links and nodes, and provides a number of virtual networks on a single network infrastructure. In order to realize a virtual network, a thorough and complete monitoring of all resources in the network should be performed firstly. OpenFlow is an open source stack for network virtualization. However, it is impossible to apply OpenFlow to AP-based legacy wireless LAN environment because OpenFlow targets ethernet-based LAN environment. In this paper, we implement an adaptor-styled virtual switch for AP-based wireless LAN through customizing the Open vSwitch which is a virtual switch of OpenFlow. The evaluation test results show that the implemented OpenFlow stack operates successfully. The implemented OpenFlow stack can now be plugged immediately in existing AP-based wireless LAN environment and plays network resource monitoring. In the future, we can develop wireless LAN virtualization applications on the wireless OpenFlow stack.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2000년도 추계종합학술대회 논문집(1)
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• pp.255-258
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• 2000

This paper presents an Interprocessor Communication Network(IPC net) in ATM switching system. In order to supply stable and independent path for processor communication, additional network i.e., Ethernet, is suggested. An Ethernet switch centered on Ethernet binds each processor into a work range. IPC net proposed in this paper assures end-to-end inter-processor connection, uniform 100Mbps Ethernet bandwidth and enhanced user cell throughput of ATM switch with minimum Ethernet supporting block integrated into ATM system

• ETRI Journal
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• 제26권5호
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• pp.505-508
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• 2004

We propose a new arbitration method for an input buffered switch with a buffered crossbar. In the proposed method, an exhaustive polling method is used to decrease the synchronization. Using an approximate analysis, we explain how the proposed method improves the switch performance. Also, using computer simulations, we show the proposed method outperforms the previous methods under burst traffic.

• 한국통신학회:학술대회논문집
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• 한국통신학회 1987년도 춘계학술발표회 논문집
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• pp.79-81
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• 1987

The traffic characteristicsof digitalswich network depend on the structure blocking probability, path searching method and etc. This paper presents the study of TDX-1 swicth network traffic capacity by considering some decisive factors such as call processing software, switch network structrure and control schme Conclusively the study shows that the switch network of TDX-1 can handle approximately up to 1650 Erlang.

• 경영과학
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• 제10권1호
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• pp.139-156
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• 1993

Various ATM switches have been proposed since Asynchronous Transfer Mode (ATM) was recognized as appropriate for implementing broadband integrated services digital network (BISDN). An ATM switching network may be evaluated on two sides : traffic performances (maximum throughput, delay, and packet loss probability, etc.) and structural features (complexity, i.e. the number of switch elements necessary to construct the same size switching network, maintenance, modularity, and fault tolerance, etc.). ATM switching networks proposed to date tend to show the contrary characteristics between structural features and traffic performance. The Knockout Switch, which is well known as one of ATM switches, shows a good traffic performance but it needs so many switch elements and buffers. In this paper, we propose an input and output buffered Knockout Switch for the purpose of reducing the number of switch elements and buffers of the existing Knockout Switch. We analyze the traffic performance and the structural features of the proposed switching architecture through a discrete time Markov chain and compare with those of the existing Knockout Switch. It was found that the proposed architecture could reduce more than 40 percent of switch elements and more than 30 percent of buffers under a given requirement of cell loss probability of the switch.

• 전자공학회논문지S
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• 제36S권10호
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• pp.40-50
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• 1999

서비스의 다양화, 고기능화, 고객의 요구에 부응하는 통신 네트워크에 대한 새로운 요구가 일어나고 있다. 따라서 ATM 전달망의 특징을 이용한 개방형 네트워크 구조에 대한 연구가 활발히 이루어지고 있다. 본 논문에서는 ATM 네트워크의 전달망을 스위치 네트워크로 이용하는 VSN(Virtual Switch Network) 개념을 IMT-2000 스위칭 시스템에 적용하고, 호 처리과정을 이용하여 VSN의 특성을 평가한다. 이 결과를 기본으로 VSN 기반 제어계 집약형 ATM-MSC 노드 구조를 제시하고, 호 처리 절차를 이용하여 VSN의 특성을 평가한다. 그 결과, 3.5msec 정도의 호 처리 지연을 허용하면, CCCP(Call and Connection Control Processor)를 중심으로 반경 100km내에서 VSN을 이용한 ATM-MSC 시스템 구성이 가능함을 나타낸다. 그리고 VSN 개념을 적용한 ATM-MSC 시스템 구성의 가능성과 VSN의 타당성을 분명히 한다.

• 한국통신학회논문지
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• 제16권11호
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• pp.1143-1153
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• 1991

본 논문은 입력과 출력 사이에 다중경로가 제공될 수 있는 GAMMA 네트워크를 이용한 새로운 ATM 스위치의 구조를 제안한 것이다. 제안된 구조는 BANYAN 네트워크를 기본으로 한 여타 ATM 스위치와는 달리 블러킹 문제 해결을 위한 Sorting 네트워크의 필요성을 배제시킨 구조로서 전체 스위치 구조가 축소될 수 있는 스위치이다 또한 시뮬레이션 기법에 의한 제안된 스위치의 성능 평가를 통해 본 연구의 타당성과 그 효율성을 검증하였다.

• Journal of the Optical Society of Korea
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• 제19권4호
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• pp.351-356
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• 2015

Visible light communication (VLC) is considered to be an attractive scheme to realize the broadband wireless communication for an indoor environment. We present a room division multiplexing (RDM) mechanism for an indoor multi-room VLC network, which utilizes the spatial position of the LED lamp in different rooms as a novel dimension of network resource for multiplexing, and thus the network capacity is increased. In such a network, the service interruption caused by user cross-room movement is an important problem, and we propose a double-area-positioning based cross-room switch solution. An experimental platform demonstrates the RDM-deployed VLC network, and validates the performance of the presented switch mechanism.

• 한국통신학회논문지
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• 제21권7호
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• pp.1756-1764
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• 1996

본 눈문에서는 buffered Banyan 네트워크에 적용되는 스위치 소자의 성능을 향상시키는 방안을 제안하고 제안된 스위치 소자의 성능을 측정하여 성능이 향상됨을 보였다. 기존의 buffered Banyan 네트워크의 스위치 소자에 FIFO(First In First Out) 버퍼를 채용하므로서 HOL(Heda-Of-Line) 블로킹이 발생하여 네트워크의 성능을 저하시킨다. 제안된 스위치 소자는 기본정보 이외의 보조정보를 이용하여 버퍼를 관리하는 CASO(Contents ASsociated Output)버퍼를 채용하므로서 HOL(Head-Of-Line) 블로킹의 발생을 제거하여 네트워크의 성능을 향상시켰다. 또한 성능측정을 위하여 buffered Banyan 네트워크의 해석모델인 MY 모델에 근거하여 제안된 네트워크를 해석하였고 이 관계식들을 이용하여 성능을 측정하였다.