• Proceedings of the Korea Information Processing Society Conference
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• 2003.11b
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• pp.1185-1188
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• 2003

기존의 컴퓨터 네트워크에서는 중간노드인 스위치나 라우터들은 단순히 패킷의 경로를 배정하거나 패킷을 전달하는데 그쳤다. 그러나 액티브 네트워크는 시스템의 효율적인 사용을 위해 특정 프로그램을 스위치나 라우터에 이식하여 최적화된 액티브 패킷을 처리할 수 있도록 한 것이다. 본 논문에서는 기존의 중앙 집중적인 네트워크 관리 시스템의 문제점을 해결하고 보다 효율적인 관리가 가능한 새로운 네트워크 관리 시스템을 제안하였다. 즉, 차세대 인터넷 기술인 액티브 네트워크 기술을 적용하여, 라우터가 패턴화된 관리 정보들을 처리하도록 하고, 네트워크 시스템 내의 관리 대상들을 분산 처리할 수 있는 새로운 네트워크 관리 시스템을 설계하였다.

• Journal of the Korea Society of Computer and Information
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• v.16 no.2
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• pp.131-140
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• 2011

Smart packet agent is an application that is proposed to provide routing protocol and service module in ubiquitous network environment. However, it uses multi-hop broadcast, thus it causes increasing network traffic, low-speed data transmission, and the unnecessary joining nodes. In this paper, a transmit technique that uses unicast-based multi-hop to have lower network traffic and faster transmission time than the multi-hop broadcast technique. In our scheme, u-Zone Master establishes temporary routing paths by calculating moving nodes' hop-counter. Therefore, it reduces smart packet agent's network traffic and retransmission rate. Besides, this paper proposed an UDP transmission that bases on sliding window. Hence, the Stop & Wait transmission speed is improved. The results, which are taken by analyzing performance prove that the proposed scheme has better performance.

• Journal of KIISE:Information Networking
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• v.36 no.3
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• pp.251-255
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• 2009

Network coding is a promising technology that increases the system throughput via reducing the number of transmission for a packet delivered from the source node to the destination node. Nevertheless, it suffers from the metrics of end-to-end delay. Network Coding scheme takes more processing delay which occurs as coding node encodes (XOR) a certain number of packets that relayed by the coding node, and more queuing delay which occurs as a packet waits for other packets to be encoded with. Therefore, in this paper, we analyze the dependency of the queuing delay to the arrival rate of each packet. In addition, we analyze and compare the delay in DCF without XOR and DCF with XOR under dynamic traffic.

• Journal of KIISE:Computing Practices and Letters
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• v.12 no.1
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• pp.78-89
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• 2006

In development of network-enabled consumer electronics, much of the time and effort is spent analyzing and solving network performance problems. In this paper, we define an instance of such problems discovered while developing a commercial home network gateway. We then analyze its cause and propose a solution mechanism. Our home network gateway uses art asymmetric link (ADSL) and suffers from an undesirable phenomenon where downlink traffic interferes with upload speed. We call this phenomenon the network performance interference problem. While this problem can easily be confused with receive livelock caused by packet contention at the input queue, we and that this is not the case. By performing extensive experiments and analysis, we reveal that our problem is caused by packet contention at the output queue and certain intrinsic characteristics of TCP. We devise an ACK-separation queuing mechanism for this problem and implement it in the home network gateway Our experiments show that it effectively solves the problem.

• The Journal of The Korea Institute of Intelligent Transport Systems
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• v.10 no.4
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• pp.93-99
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• 2011

This paper proposes a novel network jitter estimation algorithm for robust VoIP communication system. The proposed method computes the current network environment mode using the differences of arrival time and generation time from sequential received packets. According to the current network environment mode, the jitter variance weights is adjusted to minimize the error for estimating the network jitter. The jitter average and variance are calculated by the autoregressive estimated algorithm, and then the network jitter is estimated by applying the jitter variance weights.

• Proceedings of the Korean Information Science Society Conference
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• 2006.06d
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• pp.130-132
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• 2006

무선 센서 네트워크에서 패킷모음 기법은 에너지 소모 문제를 개선하기 위한 연구주제 중 하나다. 현재까지 연구된 패킷모음 기법에서는 중계노드들의 비효율적인 패킷전송이 존재한다. 본 논문에서 제안하는 기법은 센서노드의 위치에 따라 적절한 패킷모음을 함으로써 에너지 효율적으로 패킷을 전송하며, 싱크노드와의 홉 수에 따라 계층별로 패킷을 전송하는 기법을 제안한다. 더불어 계층별 패킷전송을 위해 적합한 트리구성 방법도 소개한다. 성능분석을 통해 계층별로 패킷을 모음으로써 다른 기법들과 비슷한 수준의 전송지연을 가지면서 에너지 소모 측면에서 효율적임을 보인다.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2017.05a
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• pp.113-115
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• 2017

패킷트레이서는 라우터/스위치 등 네트워크 장비를 가상으로 구성하고 각 장비의 CONFIG를 세팅, 실습 할 수 있는 프로그램이다. 고객의 요구를 받아서 중소규모 네트워크의 보안설정을 추가하여 보다 높은 안정성과 효율성 있는 네트워크를 구성하고 고객의 정보를 DB서버에 저장하여 DB서버에 접근시 데이터를 불러 올수 있도록 한다. 이 논문에서는 중소규모 병원 네트워크 인프라 구축을 위한 방안을 제시한다. 부서별로 스위치를 한대씩 배치하고 외부기관은 멀티포인트 프레임릴레이를 설정하여 전용회선으로 만들어 사용한다. 각종개인정보가 들어있는 DB는 외부에 두고 보안기능을 넣어서 신뢰성을 향상시킨다. 단순히 네트워크 구축뿐만 아니라 DB를 연동하여 정보를 저장하고, 보안 기능을 넣어서 네트워크의 취약점을 보안하고자 한다.

• Proceedings of the Korea Information Processing Society Conference
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• 2015.10a
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• pp.1152-1155
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• 2015

네트워크상의 사이버 공격을 막고 원인분석 및 공격지를 찾기 위하여, 네트워크패킷 캡쳐 및 플로우 데이터를 수집 저장하고, 수집된 정보를 고속으로 검색하여 분석하는 것을 필요로 한다. 인터넷의 발달과 네트워크를 이용하는 기기들이 많아짐에 따라 네트워크상에는 1초에 수백만 개의 네트워크 패킷이 이동하고 있다. 이러한 대용량 네트워크 패킷을 고속으로 저장하고 검색하기 위하여, 대용량 저장 및 검색에 가장 적합한 데이터베이스를 이용하는 것이 중요하다. 대용량 네트워크 데이터의 저장에 가장 최적인 데이터베이스를 찾기 위해 이 논문에서는 관계형 데이터베이스(MySQL)와 컬럼기반 데이터 베이스(InfiniFlux), 그리고 Bitmap Index 기반 저장구조(FastBit)를 사용하여 로딩속도와 검색 속도, 그리고 각각의 디스크 사용량을 비교하였다.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.15 no.4
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• pp.2382-2392
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• 2014

In this paper, a new data frame structure for wavelength routing in optical ring access network(ORAN) is designed and the functions of each field in the frame are defined. In addition, the IP packet transmission to the network layer corresponding to the newly proposed structure of the protocol stack is newly presented. Tha data transmission protocol design techniques of ORAN was proposed. IP packet and broadcasting packet transmission within the sub-network, and the IP packet transmission to other sub-network was shown through the process illustration. In the process, the encapsulation and framing process of the wavelength information to routing has been described in detail. And each step takes place in a packet transfer process is demonstrated. A ring type optical access network protocol is not yet research field. ORAN data transfer protocol to send/receive module structure of a subscriber node and a control node of the two rings which analyzed the results are shown. The high-speed Internet solution is proposed that by using wavelength routing the packet transport protocol for ORAN is designed.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.3 no.4
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• pp.274-279
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• 2002

ATM packet switching technologies for the purpose of the B-ISDN service are focused on high performance which represents good qualities on throughput, packet loss, and packet delay. ATM switch designs on a class of parallel interconnection network have been researched. But these are based on the self-routing function of it. It leads to conflict with each other, and to lose the packets. Therefore, this paper proposes the method based on Sort-Banyan network should be adopted for optimal routing algorithm. It is difficult to expect good hardware complexity. For good performance, a switch design based on the development of new routing algorithm is required. For the design of switch network, the packet distributor and multiplane are proposed. They prevent each packet from blocking as being transmitted selectively by two step distributed decision algorithm. This switch will be proved to be a good performance switch network that internal blocking caused from self-routing function is removed. Also, it is expected to minimize the packet loss and decrease the packet delay according to packet transmission.