• Title/Summary/Keyword: High Reliability Transmission

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A Study on the Implementation of Signal Transmission System Within Electric Culvert (지하 전력 구내에서 신호 전송 시스템의 실현에 관한 연구)

  • 진달복;오상기;최성주;나채동
    • The Proceedings of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.7 no.3
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    • pp.49-56
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    • 1993
  • This paper describes design and implementation of signal transmission system using LCX as communication media, which has characteristics of high reliability easy for expansion and complex transmission of voice, data and video signal in Electric culvert. In this system, we estimated system performance as result of variable transmission characteristics test. In case of voice signal, transmission loss characteristics improved 5-10(dB] than designed Values in received signal level. In the test of speech quality estimation, we obtained satisfactory result as speech intensity = 3 (QSA value), speech atriculation = 4 (QRK value). As for data and video signal transmission, communication success rates were 981% 1 in monitoring and control functional test. As a result of transmission characteristics test in transmission line and system, transmission range by LCX communication system without repeater can reach in 6Km. This paper presents basic construction method using LCX communication system for total management in Electric culvert.

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BGP Session Takeover Method Based on Docker (Docker 기반의 BGP 세션 절체 방안)

  • Kim, Sang-il;Kim, Hwa-sung
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.41 no.2
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    • pp.238-240
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    • 2016
  • Recently, the improvement in the data communication networks in terms of availability and reliability is emerging as a critical issue. In this context, the high availability and reliability of routers that control data flow and routing path between networks on the data communication network are being recognized as critical problems. Many methods for providing high availability to minimize the loss cost caused by the failure of a router are being studied. This paper proposed a BGP session takeover method using the Docker to support the high availability of the BGP session and to improve the takeover performance.

Improved Parameter Estimation with Threshold Adaptation of Cognitive Local Sensors

  • Seol, Dae-Young;Lim, Hyoung-Jin;Song, Moon-Gun;Im, Gi-Hong
    • Journal of Communications and Networks
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    • v.14 no.5
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    • pp.471-480
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    • 2012
  • Reliable detection of primary user activity increases the opportunity to access temporarily unused bands and prevents harmful interference to the primary system. By extracting a global decision from local sensing results, cooperative sensing achieves high reliability against multipath fading. For the effective combining of sensing results, which is generalized by a likelihood ratio test, the fusion center should learn some parameters, such as the probabilities of primary transmission, false alarm, and detection at the local sensors. During the training period in supervised learning, the on/off log of primary transmission serves as the output label of decision statistics from the local sensor. In this paper, we extend unsupervised learning techniques with an expectation maximization algorithm for cooperative spectrum sensing, which does not require an external primary transmission log. Local sensors report binary hard decisions to the fusion center and adjust their operating points to enhance learning performance. Increasing the number of sensors, the joint-expectation step makes a confident classification on the primary transmission as in the supervised learning. Thereby, the proposed scheme provides accurate parameter estimates and a fast convergence rate even in low signal-to-noise ratio regimes, where the primary signal is dominated by the noise at the local sensors.

Reliability Assessment of Forest Fire on Silicone Polymer Insulators in Transmission Lines( I ) (송전용 실리콘 폴리머애자의 산불영향 신뢰성 평가( I ))

  • Choi, In-Hyuk;Lee, Dong-Il;Chung, Yong-Woon;Yu, Kun-Yang
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.17 no.11
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    • pp.1199-1204
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    • 2004
  • Most overhead transmission lines in Korea run over the mountain; however, only little study has been made for the effect of mountain fire on polymeric insulator for transmission lines, though the study is significantly required, Therefore, in this study, the authors observed the deformation of the sheds of the insulator under fire, varying the ignition time using artificial ignition testing equipment, and investigated electrical and mechanical characteristics of the insulator through dry withstand voltage test, impulse flashover test and tensile load test. As the results of the tests, the following conclusions were obtained, First, when the insulator was subjected to the fire, the electrical characteristics were slightly reduced, but there was no change on the mechanical characteristics, Secondly, the sheds and sheath of the insulator were not non-flammable but less-flammable. These two results show the high mechanical stability and durability of the insulator under severe fire condition, though the electrical characteristics can be deteriorated as the time that the insulator is subjected to fire, goes by.

A Reliability Analysis in LVDC Distribution System Considering Power Quality (전력품질을 고려한 LVDC 배전계통의 신뢰도 분석)

  • Noh, Chul-Ho;Kim, Chung-Mo;Kim, Doo-Ung;Gwon, Gi-Hyeon;Oh, Yun-Sik;Han, Jun;Kim, Chul-Hwan
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.29 no.4
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    • pp.54-61
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    • 2015
  • Recently, DC-based power system is being paid attention as the solution for energy efficiency. As the example, HVDC (High Voltage DC) transmission system is utilized in the real power system. On the other hand, researches on LVDC (Low Voltage DC) distribution system, which are including digital loads, are not enough. In this paper, reliability in LVDC distribution system is analyzed according to the specific characteristics such as the arrangement of DC/DC converters and the number of poles. Furthermore, power quality is also taken account of since LVDC distribution system includes multiple sensitive loads and electric power converters. In order to achieve this, LVDC distribution systems are modeled using ElectroMagnetic Transient Program (EMTP) and both the minimal cut-set method and Customer Interruption Cost (CIC) are used in the reliability analysis.

Characterization of Inkjet-Printed Silver Patterns for Application to Printed Circuit Board (PCB)

  • Shin, Kwon-Yong;Lee, Minsu;Kang, Heuiseok;Kang, Kyungtae;Hwang, Jun Young;Kim, Jung-Mu;Lee, Sang-Ho
    • Journal of Electrical Engineering and Technology
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    • v.8 no.3
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    • pp.603-609
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    • 2013
  • In this paper, we describe the analysis of inkjet-printed silver (Ag) patterns on epoxy-coated substrates according to several reliability evaluation test method guidelines for conventional printed circuit boards (PCB). To prepare patterns for the reliability analysis, various regular test patterns were created by Ag inkjet printing on flame retardant 4 (FR4) and polyimide (PI) substrates coated with epoxy for each test method. We coated the substrates with an epoxy primer layer to control the surface energy during printing of the patterns. The contact angle of the ink to the coated epoxy primer was $69^{\circ}$, and its surface energy was 18.6 $mJ/m^2$. Also, the substrate temperature was set at $70^{\circ}C$. We were able to obtain continuous line patterns by inkjet printing with a droplet spacing of $60{\mu}m$. The reliability evaluation tests included the dielectric withstanding voltage, adhesive strength, thermal shock, pressure cooker, bending, uniformity of line-width and spacing, and high-frequency transmission loss tests.

Variation of the Verification Error Rate of Automatic Speaker Recognition System With Voice Conditions (다양한 음성을 이용한 자동화자식별 시스템 성능 확인에 관한 연구)

  • Hong Soo Ki
    • MALSORI
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    • no.43
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    • pp.45-55
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    • 2002
  • High reliability of automatic speaker recognition regardless of voice conditions is necessary for forensic application. Audio recordings in real cases are not consistent in voice conditions, such as duration, time interval of recording, given text or conversational speech, transmission channel, etc. In this study the variation of verification error rate of ASR system with the voice conditions was investigated. As a result in order to decrease both false rejection rate and false acception rate, the various voices should be used for training and the duration of train voices should be longer than the test voices.

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An improvement in Characteristics of OPGW (광복합 가공지선(OPGW)의 신뢰성 향상)

  • Kwon, Shin-Nam;An, Seong-Chang;Lee, Ho-Kyeun
    • Proceedings of the KIEE Conference
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    • 1999.07a
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    • pp.95-97
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    • 1999
  • It is becoming demand of OPGW required high reliability of the characteristics of earthing and tight transmission. This paper study the mechanical and electrical characteristics of the OPGW stranded stainless tubes lied optical fiber and aluminum alloy wire to grasp their performance and to approach to design suitable for various environment.

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Data Transmission Processing System Design for Real-Time Distributed Simulation by Using Software Design Patterns (소프트웨어 디자인 패턴을 적용한 실시간 분산 시뮬레이션을 위한 데이터 전달처리 시스템 설계)

  • Suk, Jin-Weon;Ryoo, In-Tae
    • Journal of Digital Contents Society
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    • v.10 no.4
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    • pp.649-657
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    • 2009
  • Usually, The data transmission processing efficiency of the distributed system running on high speed networks depends on the system architecture and the data transmission processing system. In order to secure the real-time rate and the system reliability, the real-time distributed simulation system on the distributed environment has tried to satisfy the performance required by the data transmission processing system. However, the client/server-based data transmission processing system in the real-time simulation system has been difficult to satisfy the system stability, extensibility and maintenability, especially when system changes. So, it is natural to study another improved data transmission processing system to solve the problems at the existing real-time simulation system. After analyzing the existing real-time simulation system, this paper will propose the improved real-time data transmission system by using Software Design Pattern, which enhances extensibility, interoperability, reusability and maintenability of the system.

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An study on the development of high output diameter 15mm actuator for precision mechanism (외경 15mm급 정밀 메카즘용 고출력 Actuator 개발에 관한 연구)

  • Kim, Joo-Han;Rhyu, Se-Hyun;Chung, Jung-Kee;Lee, Jong-Bae
    • Proceedings of the KIEE Conference
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    • 2004.11c
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    • pp.481-483
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    • 2004
  • Many application in robotics, telecommunication, automation systems etc require powerful actuator. The powerful actuator have Speeds up to high speed and high output torque efficiencies. To accomplish a powerful actuator, these powerful motor have to be combined with gearheads of the same outer diameter. So, we have developed BLDC motor and planetary type gearheads as powerful actuator. The BLDC motor have advantages that compact structure, high efficiency, high reliability. The Planetary type gearheads have advantages that same-axle structure, high torque transmission, low noise in comparison with spur gearheads. In this study included BLDC motor and planetary type gearheads design, manufacture. This time study performed for actuator of precision mechanism.

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