• Proceedings of the Korean Institute of Communication Sciences Conference
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• 1990.06a
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• pp.293-297
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• 1990

• Proceedings of the Korean Institute of Communication Sciences Conference
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• 1990.06a
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• pp.273-276
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• 1990

• Journal of the Korea Institute of Information and Communication Engineering
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• v.16 no.6
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• pp.1229-1234
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• 2012

In this paper, we analyze the problems that the DDS middleware, which is a standard data-centric communication interface, uses the fixed packet transmission method by the pre-defined protocol for exchanging data packets. The packet transmission method selected in a fixed manner cannot handle appropriately the increasing of resource overhead in an environment where the load of the DDS network changes dynamically. If the load on the node and network exceeds the threshold, the performance of the packet transmission may be degraded rapidly. This results in a failure of ensuring the real-time characteristic of DDS middleware. To solve this problem, we propose the scheme of the adaptive packet transmission for adjusting the transmission method in real-time based on the overhead on the DDS network.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.21 no.3
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• pp.652-663
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• 1996

In this paper, we analyze the blocking probability of a call in a PC communication network. In a PC communication network, a call generated from the PSTN (public switched telephone network) requests the connection to the ICPS(information communication processing system) which interconnects the the PSTN and the PSDN(packet switched data network). Then, as a second step, a packet call is requested to the specific service database attached in the PSDN. The call blocking probabilies are analyzed for these two interface points, the PSTN interface ports of the ICPS and the PSDN interface link of the database. We also present some numerical results to show the effects of the system parameters on the performance of the network. The results show the effects of the capacity of each interface point on the performance point.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.27 no.10C
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• pp.937-944
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• 2002

The current fast-growing Internet traffic is demanding more and more network capacity. Photonic packet switching offers high-speed, data rate/format transparency, and configurability, which are some of the important characteristics needed in future networks supporting different forms of data. In this paper, we define that optical backbone networks for IP transport consist of optical packet core switches and optical fibers. We propose a multi-link photonic packet switch managing as single media which unifies the whole bandwidth of multiple wavelengths on the optical fiber in the WDM optical networks. The proposed switch uses optical packet memories of output link equally as well as using the WDM buffer. So it cuts down the required number of buffers and realizes of the optical packet memory economically.

• Journal of the Korea Society of Computer and Information
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• v.7 no.4
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• pp.150-156
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• 2002

In this paper, the traffic carrying capacity of the IMT-2000 ATM-MSC is analyzed by using the reference throughput based on ITU-R. The IMT-2000 services are classified into circuit switching(speech. circuit-switched data. high interactive multimedia) and packet switching(simple message, medium multimedia, high multimedia). The indoor vehicle and pedestrian users are considered. The AAL type 2 for the speech are considered. The ratio of indoor：pedestrian：vehicle are assumed to be 40：40：20%, and size 256 of ATM-MSC are designed.

• Proceedings of the Korea Information Processing Society Conference
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• 2003.05b
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• pp.1353-1356
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• 2003

본 논문에서는 EP 보안(IPsec : IP Security)이 적용된 보안 패킷들을 네트워크 상에서 실시간으로 수집하여 분석해 주는 IP 보안 패킷 분석기를 설계 및 구현하였다. 본 패킷 분석기는 TCP UDP IP, ICMP 등의 일반 네트워크 패킷과 키 교환을 위한 IKE 패킷, 보안 통신을 위한 AM, ESP 패킷 등을 실시간으로 수집하고 분석하는 기능을 갖는다. 본 패킷 분석기는 현재의 IPv4 패킷 뿐 아니라 차세대 인터넷인 IPv6 패킷에 대하여도 실시간 수집 및 분석 기능을 제공한다. 또한 본 분석기는 IPsec 엔진에 대한 보안성을 평가하기 위한 자동화된 평가기능도 제공해 준다. 개발한 패킷 분석기를 이용하여 ETRI에서 개발한 통합 IPsec 엔진에 대한 보안성을 평가한 결과도 함께 보인다.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.23 no.7
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• pp.1777-1784
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• 1998

The packet error rates of an optical packet switching node with an optical address processor using an EDFA in order to detect M-ary correlation pulses at a fiber-optical delay line matched filter output have been evaluated. Effects of A PIN diode NEP, the gain and noise figure of the EDFA, and the bandwidth of an optical filter on the packet error rate of the switching node have been compared. There is negligible error rate change depending upon the variation of the PIN diode NEP and the EDFA gain. If the bandwidth of the optical filter is below 10 times of the data rate, there is no appreciable effect on the error rate. If the noise figure of the EDFA increases, however, the power penalty increases as much as the noise figure increment at all the bit rates and for address code sets considered in this work.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.36 no.5A
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• pp.495-501
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• 2011

IEFT proposed MIPv6 for supporting IP movement. Mobile Node is involved signaling that cause handover latency in MIPv6. Recently, Proxy Mobile IPv6 is proposed by IETF for network-based mobility management to reduce overhead in mobile node still suffers from packet loss. PMIPv6 can decrease handover latency which related overhead in MN by using network agent. Therefore, MIPSHOP Working Group proposed fast handover for PMIPv6, fu this paper, we proposed packet bicasting scheme on dual interface mobile node that can support fast handover using PMIPv6 schemes. Further, a numerical analysis is provided to show the benefits of our scheme. In the analysis, various parameters are used to compare our scheme with another procedure.

• Electronics and Telecommunications Trends
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• v.15 no.2 s.62
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• pp.15-31
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• 2000

IP 패킷스위칭을 수행할 수 있는 WDM 기반의 대용량 광패킷스위칭 시스템을 위해 입력광 신호 속도 10Gb/s의 16 x 단위 스위치로 구성되는 출력 버퍼링 방식의 방송 및 선택형스위치 구조가 제안되었다. 기존의 광소자는 광특성 때문에 집적광 집적화 논리회로(PCL)의 제작이 쉽지 않았으나 최근 세계적으로 어레이형 집적화 광소자의 개발 추세가 급속도로 진전되고 있어 대용량의 광교환기 시스템 구조는 기존의 교환기 시스템과 유사한 형태 및 구조가 가능하다.