• Proceedings of the Korean Information Science Society Conference
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• 2005.11a
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• pp.61-63
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• 2005

본 논문에서는 무선 애드 혹 네트워크상의 패킷 폐기 공격의 영향을 분석하고 시뮬레이션을 통해 그 효과를 측정하였다. 시뮬레이션 수행 결과 RREQ 패킷을 폐기한 경우에는 네트워크에 미치는 영향이 적은 반면, RREP 및 DATA 패킷을 폐기한 경우는 네트워크의 전송 효율이 떨어졌으며. 또한 패킷을 폐기하는 악성노드가 많을수록 데이터의 전달율이 감소하고 하나의 데이터를 전송 하는데 필요한 제어 패킷의 수가 늘어남을 알 수 있었다. 시뮬레이션을 통해 분석된 결과를 바탕으로 패킷 폐기 공격의 징후를 미리 검출하거나 공격 형태를 식별하는 기초 자료로 활용가능 할 것이다.

• Journal of Korea Game Society
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• v.15 no.6
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• pp.97-106
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• 2015

In an Unity engine for multi-player online games, the main thread processing game logic must be separated from the network thread that is responsible for network packet communication. Packet communication between the network threads needs to drop packets that overlap in order to improve the rendering speed. In this paper, the packet discard policy of network thread is proposed for an Unity engine for multi-player online games. The proposed method is the hybrid method of both Partial Packet Discard and Periodic Packet Discard methods to improve the rendering speed by periodically discarding overlapped network packets managed by the queue. The rendering speed of the proposed method is analyzed and its effectiveness is verified by various packet generating simulations of the Unity engine for multi-player online games.

• Journal of the Korea Society of Computer and Information
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• v.10 no.6 s.38
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• pp.227-232
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• 2005

A network of Packet based switch Mode will be required to carry the traffics(CVR,VBR, UBR, ABR) generated by a wide range of services. Packet based Network services the quality-of-Service (QoS) management of traffic sources and bandwidth. Besides efficiency and throughput services are achieved in the multimedia traffic sent in the network. In this paper. the scheduler transmits the safe packet, drop the unsafe packet and evaluate unsafe packet as the requirement of the delay avoiding the network congestion for improving the QoS of the multimedia network In this paper. we Propose the scheduling algorithm which evaluates and drops the packet . The suggested model performance of the switch is estimated and simulated in terms of the delay by computer.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.15 no.10
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• pp.2257-2264
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• 2011

Sensor nodes in Wireless sensor network have limited resources and consume almost all energy to the communication. For its traffic feature as a burst traffic type toward a sink node, it has high probability to network congestion. Network congestion causes packet drops and retransmission of dropped packets draws energy consumption. In particular, the loss of packet that is from the sensor node far away from a sink node requires additional energy consumption by frequent retransmission. This paper presents a traffic control mechanism that determines packet transfer by considering priority of packet and congestion level as well as hop count. Analysis of proposed mechanism by simulation demonstrated that it improved energy efficiency.

• Proceedings of the Korean Information Science Society Conference
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• 2007.06d
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• pp.489-494
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• 2007

침입방지 시스템(IPS, Intrusion Prevention System)은 인라인모드(in-line mode)로 네트워크에 설치되어, 네트워크를 지나는 패킷 또는 세션을 검사하여 만일 그 패킷에서 공격이 감지되면 해당 패킷을 폐기하거나 세션을 종료시킴으로서 외부의 침입으로부터 네트워크를 보호하는 시스템을 의미한다. 침입방지 시스템은 크게 두 가지 종류의 동작을 수행한다. 하나는 이미 알려진 공격으로부터 방어하는 시그너처 기반 필터링(signature based filtering)이고 다른 하나는 알려지지 않은 공격이나 비정상 세션으로부터 방어하는 자기 학습 기반의 변칙 탐지 및 방지(anomaly detection and prevention based on selflearning)이다. 시그너처 기반 필터링에서는 침입방지시스템을 통과하는 패킷의 페이로드와 시그너처라고 불리는 공격 패턴들과 비교하여 같으면 그 패킷을 폐기한다. 시그너처의 개수가 증가함에 따라 하나의 들어온 패킷에 대하여 요구되는 패턴 매칭 시간은 증가하게 되어 패킷지연 없이 동작하는 고성능 침입탐지시스템을 개발하는 것이 어렵게 되었다. 공개 침입방지 소프트웨어인 SNORT를 위한 여러 개의 효율적인 패턴 매칭 방식들이 제안되었는데 시그너처들의 공통된 부분에 대해 한번만 매칭을 수행하거나 한 바이트 단위 비교대신 여러 바이트 비교 동작을 수행함으로써 불필요한 매칭동작을 줄이려고 하였다. 본 논문에서는 패턴 매칭 시간을 시그너처의 개수와 무관하게 하기 위하여 시그너처 해싱 기반에 기반한 고성능 침입방지시스템을 제안한다.

• Proceedings of the Korean Information Science Society Conference
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• 2000.10c
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• pp.254-256
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• 2000

본 논문에서는 여러 단계의 QoS(Quality of Service)를 지원하면서 빠르고 확장이 용이하며 각종 패킷 폐기(packet drop) 방식을 지원하는 평형 파이프라인 우선순위 아웃풋 큐 구조(balanced pipelined priority output queue architecture)를 제시하고 있다. 본 방안은 기존에 연구된 파이프라인 우선순위 힙(pipelined heap, P-heap)[1]을 기반으로 하고 있다. 파이프라인 우선순휘 힙은 우선순위에 따라 패킷을 전송하는 작업을 파이프라인 방식으로 처리하여 처리 성능을 향상시킨 아웃풋 큐 구조이다. 그러나 P-heap은 평형성(balance) 문제를 전혀 고려하고 있지 않으며, 다양한 패킷 폐기 방안을 제공하고 있지 못하다. 본 논문에서는 이런 측면에서 P-heap을 개선한 Advanced P-heap을 제안하고 있다. Advanced P-heap은 평균적인 상황에서 힙에 평형성을 부여하고, 각종 패킷 폐기 정책을 지원할 수 있는 일반적인 우선순위별 차별 패킷 구조를 제시하고 있다.

• The Journal of the Acoustical Society of Korea
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• v.16 no.6
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• pp.48-53
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• 1997

The multicasting of MCS(Multicast Server) requires a effective traffic control scheme to prevent buffer overflow on ATM subnetworks. This paper considers MCS multicasting to TCP packets, and propose EPD + SPD scheme(Early Packet Discard-same Source Packet Discard) using common buffer. When the threshold of output buffer is reached, MCS drops an entire packet prior to buffer overflow, so that corrupted packets will not be transmitted by the server. And SPD scheme show that the EPD + SPD results in higher TCP throughput than that of tail drop and EPD + DFF.

• Journal of the Korea Society of Computer and Information
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• v.10 no.5 s.37
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• pp.245-250
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• 2005

A network of Packet based switch Mode will be required to carry the traffics(CVR,VBR, UBR, ABR) generated by a wide range of services. Packet based Network services the Qualify-of-Service (QoS) management of traffic sources and bandwidth. Besides efficiency and throughput services are achieved in the multimedia traffic sent in the network. In this paper, the scheduler transmits the safe packet, drop the unsafe packet and evaluate unsafe Packet as the requirement of the delay avoiding the network congestion for improving the QoS of the multimedia network. In this paper, we Propose the scheduling algorithm which evaluates and drops the packet The suggested model Performance of the switch is estimated and simulated in terms of the delay by computer.

• Journal of the Korea Society of Computer and Information
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• v.12 no.3
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• pp.177-183
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• 2007

Active queue management (AQM) refers to a family of packet dropping mechanisms for router queues that has been proposed to support end-to-end congestion control mechanisms in the Internet. The proposed AQM algorithm by the IETF is Random Early Detection (RED). The RED algorithm allows network operators simultaneously to achieve high throughput and low average delay. However. the resulting average queue length is quite sensitive to the level of congestion. In this paper, we propose the Refined Adaptive RED(RARED), as a solution for reducing the sensitivity to parameters that affect RED performance. Based on simulations, we observe that the RARED scheme improves overall performance of the network. In particular, the RARED scheme reduces packet drop rate and improves goodput.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.27 no.4C
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• pp.353-364
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• 2002

To prevent the performance degradation of TCP due to packet loss in the smooth handoff by the route optimization extension of Mobile If protocol, a buffering of packets at a base station is needed. A buffering of packets at a base station recovers the packets dropped during the handoff by forwarding the buffered packets at the old base station to the mobile user. But, when the mobile user moves to a new foreign network which is connected to a congested router, the buffered packets forwarded by the old base station are dropped and the link utilization performance degraded due to increased congestion by the forwarded packets. In this paper, when the mobile user moves to a new foreign network which is connected to a congested router, Ive propose a packet forwarding control scheme required far the old base station to improve TCP performance in mobile networks. The old base station forwards or discards the buffered packets during handoff by proposed packet forwarding control scheme based on congestion states of RED(Random Early Detection) at the congested router. Simulation results slow that link utilization performance can be improved by applying proposed packet forwarding control scheme.