• Title/Summary/Keyword: ProtocolMonitoring

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A Protocol Analysis Platform for the WTB Redundancy in Train Communication Network(TCN) (철도차량 통신 네트워크(TCN)에서의 WTB 이중화에 대한 프로토콜 분석 플랫폼)

  • Choi, Seok-In;Shon, Jin-Geun
    • The Transactions of the Korean Institute of Electrical Engineers P
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    • v.62 no.1
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    • pp.23-29
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    • 2013
  • TCN(train communication network) standard was approved in 1999 by the IEC (IEC 61375-1) and IEEE (IEEE 1473-T) organizations to warrant a reliable train and equipment interoperability. TCN defines the set of communication vehicle buses and train buses. The MVB(multifunction vehicle bus) defines the data communication interface of equipment located in a vehicle and the WTB(wire train bus) defines the data communication interface between vehicles. The WTB and each MVB will be connected over a node acting as gateway. Also, to support applications demanding a high reliability, the standard defines a redundancy scheme in which the bus may be double-line and redundant-node implemented. In this paper we have presented protocol analysis platform for the WTB redundancy which is part of TCN system, to verify communication state of high-speed trains. As a confirmation of its validity, the technology described in this paper has been successfully applied to state monitoring and protocol verification of redundancy WTB based on TCN.

Algorithm Improving Network Life-time Based on LEACH Protocol (LEACH 프로토콜 기반 망 수명 개선 알고리즘)

  • Choo, Young-Yeol;Choi, Han-Jo;Kwon, Jang-Woo
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.35 no.8A
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    • pp.810-819
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    • 2010
  • This paper proposes an algorithm to improve total network lifetime for Wireless Sensor Network (WSN) application such as environmental condition monitoring systems based on LEACH protocol. Firstly, the algorithm had equal number of nodes allocated to each cluster at cluster set-up phase where it abided by LEACH protocol. Secondly, at cluster set-up phase, each node was determined the order to be cluster header of the cluster which it had joined. After then, the role of a cluster head delivers to the next node according to determined order when the cluster head has received certain number of packets. With above method energy consumption of each node made equal and overall network lifetime was increased. Simulation results shows that overall network lifetime of proposed algorithm was increased two times than that of LEACH and total energy consumption was one forth of that of LEACH protocol.

Clustering Ad hoc Network Scheme and Classifications Based on Context-aware

  • Mun, Chang-Min;Lee, Kang-Whan
    • Journal of information and communication convergence engineering
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    • v.7 no.4
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    • pp.475-479
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    • 2009
  • In ad hoc network, the scarce energy management of the mobile devices has become a critical issue in order to extend the network lifetime. Current research activity for the Minimum Energy Multicast (MEM) problem has been focused on devising efficient centralized greedy algorithms for static ad hoc networks. In this paper, we consider mobile ad hoc networks(MANETs) that could provide the reliable monitoring and control of a variety of environments for remote place. Mobility of MANET would require the topology change frequently compared with a static network. To improve the routing protocol in MANET, energy efficient routing protocol would be required as well as considering the mobility would be needed. In this paper, we propose a new method, the CACH(Context-aware Clustering Hierarchy) algorithm, a hybrid and clustering-based protocol that could analyze the link cost from a source node to a destination node. The proposed analysis could help in defining the optimum depth of hierarchy architecture CACH utilize. The proposed CACH could use localized condition to enable adaptation and robustness for dynamic network topology protocol and this provide that our hierarchy to be resilient. As a result, our simulation results would show that CACH could find energy efficient depth of hierarchy of a cluster.

Secure and Privacy Preserving Protocol for Traffic Violation Reporting in Vehicular Cloud Environment

  • Nkenyereye, Lewis;Rhee, Kyung-Hyune
    • Journal of Korea Multimedia Society
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    • v.19 no.7
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    • pp.1159-1165
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    • 2016
  • Traffic violations such as moving while the traffic lights are red have come from a simple omission to a premeditated act. The traffic control center cannot timely monitor all the cameras installed on the roads to trace and pursue those traffic violators. Modern vehicles are equipped and controlled by several sensors in order to support monitoring and reporting those kind of behaviors which some time end up in severe causalities. However, such applications within the vehicle environment need to provide security guaranties. In this paper, we address the limitation of previous work and present a secure and privacy preserving protocol for traffic violation reporting system in vehicular cloud environment which enables the vehicles to report the traffic violators, thus the roadside clouds collect those information which can be used as evidence to pursue the traffic violators. Particularly, we provide the unlinkability security property within the proposed protocol which also offers lightweight computational overhead compared to previous protocol. We consider the concept of conditional privacy preserving authentication without pairing operations to provide security and privacy for the reporting vehicles.

An Enhanced Robust Routing Protocol in AODV over MANETs (MANETs의 AODV기반 향상된 견고한 라우팅 프로토콜)

  • Kim, Kwan-Woong;Bae, Sung-Hwan;Kim, Dae-Ik
    • The Journal of the Korea institute of electronic communication sciences
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    • v.4 no.1
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    • pp.14-19
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    • 2009
  • In Mobile Ad-hoc Network, link failure and packet loss may occur frequently due to its nature of mobility and limited battery life. In this paper, an enhanced robust routing protocol based on AODV(Ad hoc On-demand Distance Vector routing) by monitoring variation of receiving signal strength is proposed. New metric function that consists of node mobility and hops of path is used for routing decision. For preventing route failure by node movement during data transmission, a new route maintenance is presented. If the node movement is detected, the routing agent switches local path to its neighbor node. Simulation results show that the performance of the proposed routing scheme is superior to previous AODV protocol.

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Design and evaluation of wireless sensor network routing protocolfor home healthcare (홈 헬스케어를 위한 무선센서네트워크 라우팅 프로토콜 디자인 및 평가)

  • Lee, Seung-Chul;Seo, Yong-Su;Kwon, Tae-Ha;Chung, Wan-Young
    • Journal of Sensor Science and Technology
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    • v.19 no.4
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    • pp.297-305
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    • 2010
  • A home healthcare system based wireless sensor network, which can continuously monitor and manage the elderly's electrocardiogram(ECG) signal at any space at home without space limit is proposed. The communication coverage of wireless network is expended by multi-hop wireless sensor network. In order to send the elderly's ECG data wirelessly, a small size ECG sensor node was designed to forward the ECG data over multi-hop relay network. The packet acquired by mobile ECG node is transmitted through wireless intermediate nodes to base station for analyzing the packet reception rate. Modified minimum cost forwarding(MMCF) protocol and flooding protocol are designed and implemented to check the transmission efficiency of a packet in a wireless sensor network. The developed MMCF protocol shows an advantage of high reception rate by reduced network traffic.

Communication Architecture of the IEC 61850-based Micro Grid System

  • Yoo, Byong-Kwan;Yang, Seung-Ho;Yang, Hyo-Sik;Kim, Won-Yong;Jeong, Yu-Seok;Han, Byung-Moon;Jang, Kwang-Soo
    • Journal of Electrical Engineering and Technology
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    • v.6 no.5
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    • pp.605-612
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    • 2011
  • As the power grids are integrated into one big umbrella called a "smart grid," communication protocol plays a key role in successful operations. The successful deployment of smart grid interoperability is a major hurdle that must be overcome. The micro grid, a small power system that distributes energy resource, is operated in diverse regions. Different vendors use different communication protocols in the operation of the micro grid. Recently, the IEC 61850 has been legislated to solve the interoperability problems in power utility automation. The present paper presents a micro grid system based on the IEC 61850 protocol. It consists of a micro grid monitoring system, a protocol converter that transforms serial data to IEC 61850 data, and distributed energy resource controllers for diverse DER nodes. A developed communication gateway can be deployed for DER controllers with serial links to exchange data with IEC 61850-based devices. The gateway can be extended to IEC 61850-based distribution automation systems, substation automation systems, or SCADA.

Measuring Glutathione Regeneration Capacity in Stem Cells

  • Jihye Kim;Yi-Xi Gong;Eui Man Jeong
    • International Journal of Stem Cells
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    • v.16 no.3
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    • pp.356-362
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    • 2023
  • Glutathione (GSH) is a chief cellular antioxidant, affecting stem cell functions. The cellular GSH level is dynamically altered by the redox buffering system and transcription factors, including NRF2. Additionally, GSH is differentially regulated in each organelle. We previously reported a protocol for monitoring the real-time GSH levels in live stem cells using the reversible GSH sensor FreSHtracer. However, GSH-based stem cell analysis needs be comprehensive and organelle-specific. Hence, in this study, we demonstrate a detailed protocol to measure the GSH regeneration capacity (GRC) in living stem cells by measuring the intensities of the FreSHtracer and the mitochondrial GSH sensor MitoFreSHtracer using a high-content screening confocal microscope. This protocol typically analyses the GRC in approximately 4 h following the seeding of the cells onto plates. This protocol is simple and quantitative. With some minor modifications, it can be employed flexibly to measure the GRC for the whole-cell area or just the mitochondria in all adherent mammalian stem cells.

Internet-based Real-Time Remote Monitoring System for High-Speed Machining Process (인터넷 기반 실시간 원격 고속가공 모니터링)

  • 이우영;최성주;김흥배
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2000.05a
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    • pp.952-955
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    • 2000
  • Nowadays, Internet is so popular that we can easily access the remote site to search information and to communicate remote site and users. People who want to make a collaborate working environment can use JAVA, CORBA, and other internet programming tools like a Perl/XML. The mechanist are try to make the environment fur collaboration within design/manufacturing, simulation, remote sensing through TCP/IP And many industries and research institutions are working towards the agile manufacturing. This paper describes an internet-based real-Time remote monitoring system. The system consists of a hardware setup and a software interface. The hardware setup consists of a machine and its data acquisition hardware, while the software interface incorporates the data acquisition software, the server program, and the client program. The server program acts as the main interface between the data acquisition system and the internet technology. The client program is to be distributed to the remote users who want to monitor the machining status. The system has been demonstrated and verified for an industrial High-Speed Machine (HSM) especially measuring cutting force and acoustic emission. To share the signal, we make the WWW server and display its value. The system has been found to be highly efficient, reliable and accurate.

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A Study on Context Aware Middleware Design and Application (상황인식 미들웨어의 설계와 적용에 관한 연구)

  • Jang, Dong-Wook;Sohn, Surg-Won;Han, Kwang-Rok
    • The KIPS Transactions:PartD
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    • v.18D no.5
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    • pp.393-402
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    • 2011
  • This paper describes a design and application of middleware that is essential to the context-aware system. We define a transducer interface protocol in order to deal with a variety of context data. For the purpose of systematic process of data between middleware modules, a message oriented middleware is designed and implemented. Memory improves the performance of high-performance computing system compared to previous strategies. Context aware middleware adopts service oriented architecture so that functions in modules may be independent and scalability can be remarkable. Using messages across modules decreases the complexity of the application development. In order to justify the usefulness of the proposed context aware middleware, we carried out our experiments in bridge health monitoring system and verified the efficacy.