• Title/Summary/Keyword: Network Evaluation

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Cluster-Based Trust Evaluation Scheme in an Ad Hoc Network

  • Jin, Seung-Hun;Park, Chan-Il;Choi, Dae-Seon;Chung, Kyo-Il;Yoon, Hyun-Soo
    • ETRI Journal
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    • v.27 no.4
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    • pp.465-468
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    • 2005
  • This paper presents a new trust evaluation scheme in an ad hoc network. To overcome the limited information about unfamiliar nodes and to reduce the required memory space, we propose a cluster-based trust evaluation scheme, in which neighboring nodes form a cluster and select one node as a cluster head. The head issues a trust value certificate that can be referred to by its non-neighbor nodes. In this way, an evaluation of an unfamiliar node's trust can be done very efficiently and precisely. In this paper, we present a trust evaluation metric using this scheme and some operations for forming and managing a cluster. An analysis of the proposed scheme over some security problems is also presented.

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Performance Evaluation of Fault Tolerant Switched Ethernet Architecture for Railway Signal System (철도 신호 시스템을 위한 고장 허용 스위치드 이더넷 구조의 성능 평가)

  • Hwang, Jong-Gyu;Lee, Jae-Ho;Jo, Hyun-Jeong;Kim, Man-Ho;Park, Ji-Hun;Lee, Kyung-Chang;Lee, Suk
    • Journal of Institute of Control, Robotics and Systems
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    • v.12 no.12
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    • pp.1241-1248
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    • 2006
  • In high reliability systems for industrial network such as railway signal system, fieldbus protocols have been known to satisfy the real-time and fault tolerant requirements. But, the application of fieldbus has been limited due to the high cost of hardware and software, and the difficulty in interfacing with multi-vendor products. Therefore, as an alternative to fieldbus, the computer network technology, especially Ethernet(IEEE 802.3), is being adapted to the industrial network. In this paper, we propose a switched Ethernet based railway signal system because of its very promising prospect for industrial application due to the elimination of uncertainties in the network operation. In addition, we propose the redundancy architecture for the reliability of network components. More specifically, this paper presents an analytical performance evaluation of switched Ethernet for railway signal system, and shows experimental evaluation of redundancy architecture.

A Model of Analytic Network Process for the evaluation of R&D (연구개발 평가를 위한 ANP(Analytic Network Process) 모형)

  • 이영찬;정민용
    • Journal of Korean Society of Industrial and Systems Engineering
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    • v.25 no.5
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    • pp.67-74
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    • 2002
  • Technology Management and Research & Development(R&D) have been one of the most difficult divisions for measurement and evaluation. In spite of these difficulties, the importance of R&D has been dramatically increased. It is very difficult to manage more efficiently and effectively than any other departments of production, finance, marketing and so on. As criticizing the shortcomings of the traditional evaluation system in making decisions for corporate management which has only been focused on financial indices, so Kaplan & Norton has suggested the Balanced Scorecard(BSC) which can be managed Critical Success Factors(CSF) in accordance with corporate's strategy. The Analytic Network Process(ANP), based on the Analytic Hierarchy Process, allows the decision makers to leap beyond the traditional hierarchy to the interdependent environment of network modeling. Based on BSC, this study has developed the evaluation system for R&D which has used ANP transforming quantitative and qualitative indices to the quantifying scales in evaluating R&D.

Extended Trust Evaluation Mechanism Considered Confidence Value of Distributed Service in Mobile Ad-hoc Network (Mobile Ad-hoc Network 상에서 분산된 서비스에 대한 확신 값을 고려한 확장된 신뢰도 평가 기법)

  • Jang, Jong-Deok;Yoon, Chang-Pyo;Ryou, Hwang-Bin
    • Convergence Security Journal
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    • v.10 no.2
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    • pp.51-57
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    • 2010
  • This paper proposes extended trust evaluation mechanism which is able to become the standard of the node selection which provides a better service by using the basic transaction message which occurs from within the mobile Ad-hoc network and the additional transaction message and add confidence value. Furthermore, throughout the simulation shows the efficiency of the proposed trust evaluation mechanism.

Performance Evaluation of Chip Breaker Utilizing Neural Network (신경망기법에 의한 칩브레이커의 성능평가)

  • Kim, Hong-Gyoo;Sim, Jae-Hyung
    • Transactions of the Korean Society of Machine Tool Engineers
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    • v.16 no.3
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    • pp.64-74
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    • 2007
  • The continuous chip in turning operation deteriorates precision of workpiece and causes a hazardous condition to operator. Thus the chip form control becomes a very important task for reliable machining process. So, grooved chip breaker is widely used to obtain reliable discontinuous chip. However, developing new cutting insert having chip breaker takes long time and needs lots of research expense due to a couple of processes such as forming, sintering, grinding and coating of product and many different evaluation tests. In this paper, performance of commercial chip breaker is evaluated with neural network which is learned with a back propagation algorithm. For the evaluation, several important elements(depth of cut, land, breadth, radius) which directly influence the chip formation were chosen among commercial chip breakers and were used as input values of neural network. With the results of these input values, the performance evaluation method was developed and applied that method to the commercial tools.

A Case Study of Generating and Evaluating Subway Network Alternatives (지하철로선의 대안설정과 평가분석에 관한 사례연구)

  • 임승달;이인달
    • Journal of Korean Society of Transportation
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    • v.1 no.1
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    • pp.104-120
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    • 1983
  • Alternative generation and evaluation in the transportation planning process are generally considered the two most important areas of research. It is, however, unfortunate that most of Korean transportation network systems are evolved without thorough investigation of alternatives and that underplanned systems as well as over-planned systems ar blamed for the current transportation problems. This paper investigates the practical use of formal methodology of alternative generation and evaluation. The maximum possible alternative network approach and the computer oriented network evaluation method developed by KIST and applied for Pusan subway study are summarized to demonstrate their practical usefulness. The practical problems centering around the quantification of evaluation criteria ar also summarized for further studies.

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Selection of Suppliers Using the Analytic Network Process (네트워크 분석과정을 이용한 공급업체 평가에 대한 연구)

  • Jung, Uk;Chang, Byeong-Yun
    • Journal of Korean Society for Quality Management
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    • v.37 no.4
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    • pp.1-9
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    • 2009
  • Supplier selection process is one of the most important arenas of production and logistics management for many companies. This study explores the application of the analytic network process (ANP) approach for the evaluation of suppliers based on several different evaluation criteria. The ANP approach in this study is capable of providing priorities of suppliers that capture network relationships among several evaluation criteria which are not independent. Therefore this study provides value to practitioners by providing a generic model for supplier selection. In addition, for researchers, it demonstrates further research possibilities for more complex decision making problems using ANP.

A Study on the Evaluation Indicators of Web Accessibility using Social Network Analysis (사회연결망분석을 활용한 웹 접근성 평가 지표 개발 방향 제안에 대한 연구)

  • Lee, Eun Suk;Cha, Kyung Jin
    • Smart Media Journal
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    • v.10 no.1
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    • pp.47-54
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    • 2021
  • Web accessibility is presented as a legal obligation to ensure users can access and use information and functions equally in the domestic public website sector. This study introduces the researcher network based on social network analysis (SNA) in order to show the citation relationship by identifying the network among researches in the field of web accessibility. Based on the analysis of the relationship and citation of academic researchers in the domestic web accessibility field, confirm the process of creating a research network. It is a visualization element that shows the citation relationship as well as the relationship and citation form between the studies as a network. Through the process of creating the network, and it can be confirmed and can be usefully used for future academic research network analysis. It is meaningful in terms of analysis for about 17 years from January 2000 to March 2017, a total of 50 papers published in journals registered by the National Research Foundation of Korea and candidate journals. By combining the evaluation metrics for each researcher, evaluation target, evaluation method, and evaluation result for web accessibility, and applying weights, identify the research direction and evaluation research trends in Korea's web accessibility field related to the relevant field and web accessibility evaluation research trends, and related to the researcher trend network.

Performance comparison evaluation of real and complex networks for deep neural network-based speech enhancement in the frequency domain (주파수 영역 심층 신경망 기반 음성 향상을 위한 실수 네트워크와 복소 네트워크 성능 비교 평가)

  • Hwang, Seo-Rim;Park, Sung Wook;Park, Youngcheol
    • The Journal of the Acoustical Society of Korea
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    • v.41 no.1
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    • pp.30-37
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    • 2022
  • This paper compares and evaluates model performance from two perspectives according to the learning target and network structure for training Deep Neural Network (DNN)-based speech enhancement models in the frequency domain. In this case, spectrum mapping and Time-Frequency (T-F) masking techniques were used as learning targets, and a real network and a complex network were used for the network structure. The performance of the speech enhancement model was evaluated through two objective evaluation metrics: Perceptual Evaluation of Speech Quality (PESQ) and Short-Time Objective Intelligibility (STOI) depending on the scale of the dataset. Test results show the appropriate size of the training data differs depending on the type of networks and the type of dataset. In addition, they show that, in some cases, using a real network may be a more realistic solution if the number of total parameters is considered because the real network shows relatively higher performance than the complex network depending on the size of the data and the learning target.

Design and Implementation about Trust Evaluation Mechanism of Distributed Services In Mobile Ad-hoc Network (Mobile Ad-hoc Network 상의 분산된 서비스에 대한 신뢰도 평가 기법 설계 및 구현)

  • Jang, Jong-Deok;Ryu, Hwang-Bin;Yoon, Chang-Pyo
    • Convergence Security Journal
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    • v.9 no.4
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    • pp.29-34
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    • 2009
  • The many transaction occurs because of service will not be able to trust in mobile Ad-hoc Network. Overcomes like this problem point with the plan for, This paper proposes the trust evaluation mechanism which is the possibility becoming the standard of the node selection which provides a better service by using the transaction message which is basic occurs from within the mobile Ad-hoc network and in the transaction message which is additional. At last, this paper embodies the trust mechanism which proposes, confirms the trust value which is evaluated with NS2 simulator.

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