• Proceedings of the IEEK Conference
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• 2001.06a
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• pp.297-300
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• 2001

This paper proposes a sound multicast packet-switching method which can less affect QoS degradation. The method includes a switch fabric with extra switching paths dedicated for multicast packets. Presented also are both a buffering structure and a scheduling algorithm for the proposed method. Simulation analysis for the method shows that the switching delay of unicast packets is decreased even though arrival rate of multicast packets is increased.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2003.10a
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• pp.373-376
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• 2003

This paper presents a new, three-dimensional round-robin scheduler that provides high throughput and fair across in an advanced input-queued packet switch using shared input buffers. We consider an architecture in which each input port group shares a common buffer and maintains a separate queue for each output, which is ratted the distributed common input buffer switch. In an NxN switch, our scheduler determines which queue in the total MxN input queues is served during each time slot where M is the number of common buffers. We suppose that each common buffer has K input ports and K output ports, and manages N output queues. The 3DRR scheduler determines MxK queues in every K(M) cycle when $K\geq$M (K$\leq$M), and provides massively parallel processing for the applications of high-speed switches with a large number of ports. The 3-DRR scheduler can be implemented using duplicated simple logic components allowing very high-speed implementation.

• The Transactions of the Korea Information Processing Society
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• v.6 no.6
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• pp.1581-1589
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• 1999

In B-ISDN(Broadband Integrated Services Digital Networks), the efficient implementation of multicast function is very important since the demand for distributed type of service such as VOD(Video On Demand) system is expected to grow. In this paper, the multicast performance characteristics of fully-interconnected switch fabric used for our research is the proper architecture for a small-sized switch element, and it uses bit addressing method for addressing scheme and thus it is easy to implement multicast function without adding a function block. To incorporate the bursty nature of traffic in ATM networks, we used IBP(Interrupted Bernoulli Process) model as an input traffic model. We presented and analyzed the simulation results in terms of the multicast operation of the switch. Based. on this study, it its analyzed that congestion avoidance may be feasible if we use a proper traffic control scheme by finding an overload point due to multicast.

• Fashion & Textile Research Journal
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• v.11 no.1
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• pp.121-129
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• 2009

Nowadays, global interest is being placed on research and development of smart clothing which is expected to create a high added-value industry in the future. The purpose of this research is to develop smart pants with vibrating massage functions that have excellent outer appearances and provide comfort to wearers and assess outer appearance, comfort, and massaging effects of smart pants. As the results of this research, smart pants where vibrating devices which are mainly composed of vibrating motor, controller, and switch are attached were completed. Vibrating motors were fixed on a thin and light non-woven fabric material, covered with a mesh material, and attached by snaps to the experiment pants. Switch was attached to the inside of a pocket, and batteries were positioned inside of pockets. Ten subjects marked their satisfaction of wearing smart pants on a 5-point scale. Noticeable changes in outer appearance when vibrating motors operate turned out to be low. Wearer's comfort in back waist and front thigh parts where vibrating motors were attached turned out to be high-satisfied. Massaging effects of smart pants turned out to be high. Attaching and detaching vibrating devices turned out to be convenient. Lining materials used for smart paints were effective in blocking electromagnetic waves generated from vibrating devices.

• Journal of the Institute of Electronics Engineers of Korea TC
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• v.40 no.4
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• pp.10-21
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• 2003

Recently, the optical subscriber interface module uses the high performance network processor to quickly develop new application services such as MPLS, VPN, RPR and EPON with a short time-to-market. Although a number of vendors are developing the network processor at 2.5Gbps, only the IBM NP4GS3 can provide packet processing with wire-speed at 2.5Gbps. IBM NP4GS3, however, uses its unique speed DASL interface instead of CSIX-Ll interface, which has standardized by M: Forum currently Therefore, we implement an interconnection mechanism to use the switch fabric with CSIX-Ll interface. In this paper, we suggest the architecture and a packet control mechanism supporting interconnection between IBM NP4GS3 DASL and CSIX-Ll switch interface using the common IBM UDASL ASIC and XILINX FPGA.

• Proceedings of the Optical Society of Korea Conference
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• 2002.07a
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• pp.258-259
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• 2002

광회선 분배 시스템(OXC)은 전광통신망(Optical Transport Network)에서 광신호 간 연결을 원격으로 설정해 줄 수 있는 노드(Optical Network Element)이다. OXC는 다수의 입력/출력 링크를 가지며 하나의 입력/출력 링크에는 다수의 파장 다중된 광신호 채널이 존재한다. OXC는 하나의 입력 링크를 통하여 입력되는 다수의 파장 채널을 서로 다른 출력 링크로 연결해 주거나, 다수의 입력 링크로부터 입력되는 파장채널을 하나의 출력 링크로 연곁해 줄 수 있는 optical grooming 기능을 수행한다. 또한 자국에서 광신호를 Add/Drop할 수 있는 기능을 가질 수 있다. (중략)

• The Transactions of the Korea Information Processing Society
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• v.7 no.6
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• pp.1941-1948
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• 2000

Multistage interconnection networks (MINs) have been recognized as an efficient interconnection network for high-performance computer systems and also have been recently identified to be effective for a switching fabric of new communication structures - gigabit ethernet switch, terabit router, and ATM (asynchronous transfer mode). While lots of models analyzing the performance of MINs have been proposed, they are either inaccurate or, even if accurate, very complex for the analysis. In this paper, we propose an extremely simple mode for evaluating the multibuffered MIN with small clock cycles based on the approximation approach. Comprehensive computer simulation shows that the proposed model is very accurate in terms of the throughput and mean delay. Furthermore, it significantly reduces the computing overhead due to its simplicity.

• Electronics and Telecommunications Trends
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• v.23 no.2 s.110
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• pp.130-141
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• 2008

본 OTH 스위치패브릭 구성방안은 OTN 망에서 다양한 클라이언트 신호를 수용하기 위한 요구사항을 기반으로 소용량에서부터 320G급 이상의 대용량까지 차세대 전송망에서 다양한 기능과 경쟁력을 갖추기 위한 OTH 스위치패브릭 구성방안을 고찰하였다. OTH 망에서 리던던시 구조 및 입출력 포트 요구조건의 설정에 따라 망 구성 및 시스템 설계를 할 수 있도록 스위치패브릭을 구성하는 방안을 제시하였다. 본 고에서는 최근 시스템 플랫폼의 세계 추세로 적용되고 있는 Advanced TCA 기반으로 백플레인 구성방법에 따라 가능한 구조를 고찰하였으며, Advanced TCA 플랫폼 및 이와 경쟁 가능한 동등 이상의 플랫폼 기반에서 적용 가능하다.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 1998.11a
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• pp.305-308
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• 1998

통신처리시스템(Communication Processing System)은 전화망과 ISDN 가입자들에게 전국 규모의 PC 통신 및 인터넷 액세스를 가능하게 하기 위한 망정합 장치이며, 동시에 관련 서비스 관리 기능과 같은 통신처리 서비스를 제공하는 시스템이다. 그러나 다수의 PC 통신과 인터넷 서비스 제공자들이 등장함으로써 가입자들에게 이러한 복수의 서비스 제공자 시스템으로의 동등 서비스 접속 기능을 제공하기 위해서는 시스템 내부에 고속 Switching Fabric을 통한 스위칭 기능 및 서비스 제공자에 대한 선택 기능이 요구된다. 본 논문에서는 이러한 통신처리시스템의 시스템 구성 개요 및 사용자들에게 서비스 선택 기능을 신축적으로 제공하기 위한 내부 스위치를 사용함으로써 1200 채널 규모의 PC 통신 및 인터넷 액세스 서비스 기능을 제공하는 시스템의 설계 및 구현내용을 중심으로 기술한다. 또한 시스템의 성능 및 용량 설계를 위한 LAN 스위치의 설계 모델, 기능적 요구사항, 그리고 설계 및 구현 내용에 대해 기술한다.

• Proceedings of the IEEK Conference
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• 2002.07b
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• pp.1011-1014
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• 2002

This paper proposes a multicast packet-switching method which can less affect QoS degradation. The method includes a switch fabric with extra switching paths dedicated for multicast packets. Presented also are both a buffering structure and a scheduling algorithm for the proposed method. Simulation analysis for the method shows that the switching delay of unicast packets is decreased even though arrival rate of multicast packets is increased.