• Journal of the Institute of Convergence Signal Processing
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• v.24 no.3
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• pp.166-171
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• 2023

Efficient energy management is a very important factor in sensor networks with limited resources, and cluster techniques have been studied a lot in this respect. However, a problem may occur in which energy use of the cluster header is concentrated, and when the cluster header is not evenly distributed over the entire area but concentrated in a specific area, the transmission distance of the cluster members may be large or very uneven. The transmission distance can be directly related to the problem of energy consumption. Since the energy of a specific node is quickly exhausted, the lifetime of the sensor network is shortened, and the efficiency of the entire sensor network is reduced. Thus, balanced energy consumption of sensor nodes is a very important research task. In this study, factors for balanced energy consumption by cluster headers and sensor nodes are analyzed, and a balancing distribution clustering method in which cluster headers are balanced distributed throughout the sensor network is proposed. The proposed cluster method uses multi-hop routing to reduce energy consumption of sensor nodes due to long-distance transmission. Existing multi-hop cluster studies sets up a multi-hop cluster path through a two-step process of cluster setup and routing path setup, whereas the proposed method establishes a hierarchical cluster routing path in the process of selecting cluster headers to minimize the overhead of control messages.

• Proceedings of the Korean Information Science Society Conference
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• 2001.10c
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• pp.457-459
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• 2001

오늘날 MPLS 망에서의 제어 부분(control plane)을 다양한 장치의 스위칭(switching)과 포워딩(forwarding) 기술 및 계층을 포함할 수 있도록 확장하기 위해서 IETF에서 GMPLS 망이 제안되고 있다. 그리고 망은 보호(protection)와 복구(restoration)를 통해서 망의 생존성(survivability)을 지원해야만 한다. 망은 어떤 장애에서도 서비스가 제공될 수 있어야 한다. 본 논문은 Kini에 의해서 제안된[5] MPLS망에서 망의 장애 시에 망의 생존성과 효율성을 고려해서 복구하기 위해서, 백업 패스(Backup Path)를 설정하는 방법을 GMPLS에서 적용하려고 한다. 즉, GMPLS 망에서 망에 장애가 발생했을 때 효율적으로 복구하기 위해서, RSVF-TE(resource Reservation Protocol with Traffic Engineering)를 이용해서 백업 패스를 잡는다.

• Proceedings of the Korea Information Processing Society Conference
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• 2002.11b
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• pp.1015-1018
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• 2002

신뢰채널은 시스템 사이에 신뢰성이 보장되는 통신 경로를 제공하며, 이는 통신 트래픽에 대한 기밀성 및 인증, 부인방지 등의 다양한 보안 서비스를 포함한다. 본 논문에서는 강제적 접근제어가 구현된 커널, 즉 보안 운영체제 사이에서의 신뢰채널 구현에 대해 설명한다. 설명하는 신뢰채널은 트래픽에 대해서 불법적인 노출과 변조를 방지할 수 있도록 기밀성 서비스와 인증 서비스 중 메시지 인중을 제공하며, IP 계층의 커널수준에서 구현되어 사용자에게 투명하게 동작한다.

• Proceedings of the Korea Information Processing Society Conference
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• 2013.11a
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• pp.323-326
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• 2013

최근 지능형 교통 시스템 (ITS) 에 대한 관심이 증가함에 따라 ITS 응용을 지원해 줄 수 있는 차량 에드혹 네트워크 (VANET, Vehicular Ad-Hoc Network) 기술이 주요 이슈로 대두되고 있다. 특히 트랜스포트 계층에서는 종단간 신뢰성이 요구되는 ITS 응용들을 지원하기 위해 TCP를 적용할 필요가 있다. 하지만 VANET 환경에서 TCP는 혼잡 제어 기능의 오동작, 이동성에 의한 경로 재설정 오버헤드, 경쟁(contention) 등으로 인해 throughput을 불필요하게 감소시킬 수 있다. 따라서 VANET 환경에서 TCP 성능을 향상시킬 수 있는 다양한 기법들에 대한 연구가 진행되고 있다. 본 논문에서는 이러한 기법들을 크게 혼잡 탐색 기법, cross-layer 기법으로 나누어 대표적인 두 가지 기법들을 각각 비교, 분석한다.

• Journal of the Institute of Electronics Engineers of Korea TC
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• v.42 no.9 s.339
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• pp.29-40
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• 2005

In this paper, we propose a Cluster-based Multicast Routing (CMR) suitable for mobile ad-hoc networks. The main features that our proposed method introduces are the following: a) mobility-based clustering and group based hierarchical structure in order to effectively support stability and scalability, b) group based mesh structure and forwarding tree concepts in order to support the robustness of the mesh topologies which provides limited redundancy and the efficiency of tree forwarding simultaneously, and c) combination of proactive and reactive concepts which provide low route acquisition delay and low overhead. The performance evaluation of the proposed protocol is achieved via modeling and simulation. The corresponding results demonstrate the Proposed multicast protocol's efficiency in terms of packet delivery ratio, scalability, control overhead, end-to-end delay, as a function of mobility, multicast group size, and number of senders.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.32 no.12B
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• pp.800-808
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• 2007

With the development of wireless data communication technology, all IP-based network will become compositions of wired and wireless networks. TCP is a connection-oriented, reliable transport protocol and has been used as de facto standard in most wired networks. Because TCP's congestion control algorithm could not distinguish congestion from BER, link failure and frequent route changes, TCP shows a poor performance over mobile ad-hoc networks. In this paper, the theoretical feature of TCP was studied and the performance of TCP over mobile ad-hoc networks was analyzed with ns2.

• Proceedings of the Korea Information Processing Society Conference
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• 2016.04a
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• pp.51-54
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• 2016

NTB는 transparent bridge와 공통적으로 독립적인 PCI bus(PCI 또는 PCI Express bus)에 대해서 데이터 전송 경로(path)를 제공한다는 점에서 기능적으로 유사하다. 그러나, NTB와 transparent bridge 간의 가장 큰 차이점은 NTB가 사용될 경우에 bridge의 하향부분(downstream side)에 위치한 장치들은 상향부분(upstream side)에서는 보이지 않는다는 점이다. 이는 bridge의 하향부분(downstream side)에 위치한 인텔리전트(intelligent)한 제어기(예를들면 CPU를 포함하는 컴퓨터)가 자신의 downstream side에 위치하는 서브시스템 내 각종 장치들을 독립적으로 관리할 수 있다는 점이다. NTB는 또한 첫 번째 호스트(primary host)의 PCI bus로 구성된 서브시스템(subsystem) 계층구조(hierarchy)에 두 번째 호스트(secondary host)를 연결하는 데 사용될 수 있다. 이는 두 시스템간 통신을 가능하도록 하는 반면, 두 시스템을 서로 격리시키는 효과도 발생한다. 즉, NTB는 일반적으로 도어벨(doorbell)을 통해서 bridge의 다른 편에 위치한 장치에 대해서 인터럽트를 보낼 수 있으며, 또한, scratchpad 레지스터를 보유하고 있어 bridge의 양측에서 데이터를 상호 공유함으로써 interprocessor communication 할 수 있다.

• Journal of Internet Computing and Services
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• v.25 no.1
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• pp.177-188
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• 2024

As technology evolves, Internet usage continues to grow, resulting in a geometric increase in network traffic and communication volumes. The network path selection process, which is one of the core elements of the Internet, is becoming more complex and advanced as a result, and it is important to effectively manage and analyze it, and there is a need for a representation and visualization method that can be intuitively understood. To this end, this study designs a framework that analyzes network data using BGP, a network path selection method, and applies it to the cyber common operating picture for situational awareness. After that, we analyze the visualization elements required to visualize the information and conduct an experiment to implement a simple visualization. Based on the data collected and preprocessed in the experiment, the visualization screens implemented help commanders or security personnel to effectively understand the network situation and take command and control.

• Journal of the Korea Convergence Society
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• v.11 no.3
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• pp.77-83
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• 2020

Recently, intelligent predictive surveillance system has emerged. It is a system that can probabilistically predict the future situation and event based on the existing data beyond the scope of the current object or object motion and situation recognition. Since such intelligent predictive monitoring system has a high possibility of handling personal information, security consideration is essential for protecting personal information. The existing video surveillance framework has limitations in terms of privacy. In this paper, we proposed a security framework for intelligent predictive surveillance system. In the proposed method, detailed components for each unit are specified by dividing them into terminals, transmission, monitoring, and monitoring layers. In particular, it supports active personal information protection in the video surveillance process by supporting detailed access control and de-identification.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.35 no.3B
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• pp.408-420
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• 2010

On a Mobile Ad hoc NETwork(MANET), it is difficult to detect and prevent misbehaviors nodes existing between end nodes, as communication between remote nodes is made through multiple hop routes due to lack of a fixed networked structure. Therefore, to maintain MANET's performance and security, a technique to identify misbehaving middle nodes and nodes that are compromise by such nodes is required. However, previously proposed techniques assumed that nodes comprising MANET are in a friendly and cooperative relationship, and suggested only methods to identify misbehaving nodes. When these methods are applied to a larger-scale MANET, large overhead is induced. As such, this paper suggests a system model called Secure Cluster-based MANET(SecCBM) to provide secure communication between components aperANET and to ensure eed. As such, this pand managems suapemisbehavior nodes. SecCBM consists apetwo stages. The first is the preventis pstage, whereemisbehavior nodes are identified when rANET is comprised by using a cluster-based hierarchical control structure through dynamic authentication. The second is the post-preventis pstage, whereemisbehavior nodes created during the course apecommunication amongst nodes comprising the network are dh, thed by using FC and MN tables. Through this, MANET's communication safety and efficiency were improved and the proposed method was confirmed to be suitable for MANET through simulation performance evaluation.