• The Journal of Korean Institute of Communications and Information Sciences
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• v.24 no.12A
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• pp.1985-1991
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• 1999

In this paper, complete and general two-port lumped Spice-network model is developed for a lossy transmission line. This model is realized as a Spice subcircuit, by means of standard lumped network elements and mathematical functions. It is used as a component in the time-domain simulation of a high-speed data transmission line such as IMI(Inter Module Interface) data path in HANbit ACE 64 ATM switching system. The only required Spice network elements are resistance and frequency-dependent controlled-voltage sources. Such frequency-dependent sources are realized by utilizing the standard Hspice mathematical functions FREQ, DELAY, and POLY.

• Proceedings of the Korean Operations and Management Science Society Conference
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• 1998.10a
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• pp.179-179
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• 1998

• Proceedings of the Korean Institute of Communication Sciences Conference
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• 1998.10a
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• pp.54-57
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• 1998

• Proceedings of the Korean Institute of Communication Sciences Conference
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• 1996.10a
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• pp.348-351
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• 1996

• The Journal of Korean Institute of Communications and Information Sciences
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• v.22 no.9
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• pp.1867-1879
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• 1997

DREAM-S is a distributed main-memory database system for the real-time processing of shared operational datra in ATM switching systems. DREAM-S has a client-server architecture in which only the server has the diskstorage, and provides the T-Tree index structure for efficient accesses to the data. We propose a recovery technique for the T-Tree index structre in DREAM-S. Although main-memory database system offer efficient access performance, the database int he main-memory may be broken when system failure such as database transaction failure or power failure occurs. Therfore, a recovery technique that recovers the database (including index structures) is essential for fault tolerant ATM switching systems. Proposed recovery technique relieves the bottleneck of the server processors disk operations by maintaining the T-Tree index structure only in the main-memory. In addition, fast recovery is guaranteed even in large number of client systems since the T-Tree index structure(s) in each system can be recovered cncurrently.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.25 no.1A
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• pp.56-63
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• 2000

In this paper, we design new high performance ATM switch architectures based on a Generalized Shuffle network(GSN). The GSN is a distributed network topology with the number of nodes in O(N). To improve the throughput of the switch, a layering strategy called Weaved GSN(WGSN). WGSN has an additional connection links between switching elements which locate in the same position of adjacent GSNs. The analysis and simulation are performed under uniform and full load conditions, and the results show that the proposed switch has better throughput and cell loss performance when compared with other banyan-based switch architectures known so far.

• Proceedings of the Korean Institute of Communication Sciences Conference
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• 1996.10a
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• pp.297-299
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• 1996

• The Transactions of the Korean Institute of Electrical Engineers C
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• v.49 no.8
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• pp.433-437
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• 2000

We fabricated switch module of ATM(Asynchronous Transfer Mode) exchange system with MCM-C(MultiChip Module Co-fired) technology and measured its electrical characteristics. Green tape was used as substrate and Au/Ag paste was used to form the interconnect layers. The via holes were made by drill and filled with metal paste usign screen method. After manufacturing the substrate, chips and passive components were assembled on the substrate. In electrical test, the module showed the output signal of 46.9MHz synchronized with input signal. In the view of substrate size reduction, the area of MCM switch module was 35% of conventional hybrid switch module.

• Proceedings of the Korean Information Science Society Conference
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• 1998.10a
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• pp.359-361
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• 1998

초고속 정보통신망의 등장과 다양한 서비스 및 통신기능을 갖춘 정보가전의 개발로 인하여 댁내 통신망 개발의 중요성이 대두되고 있다. 본 논문에서는 댁내의 정보 가전들간에 경제적으로 ATM 기반의 고속 통신 기술을 제공하는HAN/RT(Home ATM Network with Ring Topology)프로토콜을 제안한다. HAN/RT는 저가이며 단순한 기능만을 가진 스위치로 셀 스위칭을 수행하며, 스위치의 복잡한 기능을 제어기에 적재하며 효율적인 망구조를 설계한다. 또한 HAN/RT에서의 셀 교환 시나리로에 대하여 기술한다.

• Electronics and Telecommunications Trends
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• v.12 no.1 s.43
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• pp.15-25
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• 1997

적어도 20~30년 내에 완전한 ATM 망이 운용되기 위해서 음성 및 데이터와 같은 기존 협대역 통신뿐 아니라 대화형 TV같은 새로운 타입의 광대역 통신이 가능한 대용량 시스템이 요구되므로, 기존의 일반적인 ATM 교환기의 다중프로세서 시스템 구조 및 특성을 살펴보고, 초고속 정보 통신망 환경에 부합되는 대용량 ATM 시스템을 위한 새로운 다중프로세서의 구조를 고찰함으로써 미래의 시스템 설계 방향을 제시한다.