• Title/Summary/Keyword: information reliability

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Communication Network Architectures for Southwest Offshore Wind Farm (한국 서남 해상 풍력발전단지 통신망 연구)

  • Ahmed, Mohamed A.;Kim, Young-Chon
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.42 no.1
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    • pp.88-97
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    • 2017
  • With the increasing of the penetration rate of large-scale wind farms, a reliable, highly available and cost-effective communication network is needed. As the failure of a WF communication network will significantly impact the control and real-time monitoring of wind turbines, network reliability should be considered into the WF design process. This paper analyzes the network reliability of different WF configurations for the Southwest Offshore project that is located in Korea. The WF consists of 20 WTs with a total capacity of 60 MW. In this paper, the performance is compared according to a variety of indices such as network unavailability, mean downtime and network cost. To increase the network reliability, partial protection and full protection were investigated as strategies that can overcome the impact of a single point of failure. Furthermore, the reliability performances of different network architectures are analyzed, evaluated and compared.

Impacts of Success Factors of Information System on Business Performance through Security Reliability of Casino Information System and Job Satisfaction (정보시스템 성공요인이 카지노정보시스템의 보안신뢰와 직무만족을 통해 경영성과에 미치는 영향)

  • LEE, Dae Kun;HWANG, Chan Gyu
    • Journal of Digital Convergence
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    • v.14 no.9
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    • pp.181-198
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    • 2016
  • This study explored the performance factors of casino information systems for foreigners, empirically examined the causal relation between these factors and the business performances through organizational trust and job satisfaction and suggested a direction to enhance the casino information systems. The result of this study showed that, firstly, information quality impacted positively on security reliability and job satisfaction. Secondly, system quality impacted positively on security reliability and job satisfaction. Thirdly, service quality impacted positively on security reliability and job satisfaction. Fourthly, security reliability impacted positively on job satisfaction through security reliability. Lastly, security reliability and job satisfaction impacted positively on business performance. This research must be continued by expanding upon the variables of this research study, and there is a need for follow up research on methods that can analyze the management performance of casino information systems from a diverse set of approaches and also research that conducts an analysis on systems that are implemented to prevent tax evasion.

Improving the Reliability of IEEE 802.11s Based Wireless Mesh Networks for Smart Grid Systems

  • Kim, Jaebeom;Kim, Dabin;Lim, Keun-Woo;Ko, Young-Bae;Lee, Sang-Youm
    • Journal of Communications and Networks
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    • v.14 no.6
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    • pp.629-639
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    • 2012
  • A challenge faced by smart grid systems is providing highly reliable transmissions to better serve different types of electrical applications and improve the energy efficiency of the system. Although wireless networking technologies can provide high-speed and cost-effective solutions, their performance may be impaired by various factors that affect the reliability of smart grid networks. Here, we first suggest the use of IEEE 802.11s-based wireless LAN mesh networks as high-speed wireless backbone networks for smart grid infrastructure to provide high scalability and flexibility while ensuring low installation and management costs. Thereafter, we analyze some vital problems of the IEEE 802.11s default routing protocol (named hybrid wireless mesh protocol; HWMP) from the perspective of transfer reliability, and propose appropriate solutions with a new routing method called HWMP-reliability enhancement to improve the routing reliability of 802.11s-based smart grid mesh networking. A simulation study using ns-3 was conducted to demonstrate the superiority of the proposed schemes.

Reliability Assessment Criteria of Satellite Information System Applied for Vehicles (자동차 적용기기용 위성정보시스템 모듈의 신뢰성 평가기준)

  • Song, Byeong-Suk;Hwang, Soon-Mi;Chan, Sung-Il;Jeong, Hai-Sung;Baik, Jai-Wook
    • Journal of Applied Reliability
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    • v.9 no.2
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    • pp.93-106
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    • 2009
  • GPS(Global positioning system) system is widely used in artificial satellite, ground controlled approach system as well as in end-user environment such as in the automobile. It is exposed to a very diverse environment and consists of many complicated components and therefore needs careful approach to the enhancement of reliability of the item. In this article reliability standards for the GPS system are established in terms of quality certification tests and failure rate tests.

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A Study of Software Quality Evaluation Using Error-Data (오류데이터를 이용한 소프트웨어 품질평가)

  • Moon, Wae-Sik
    • Journal of The Korean Association of Information Education
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    • v.2 no.1
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    • pp.35-51
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    • 1998
  • Software reliability growth model is one of the evaluation methods, software quality which quantitatively calculates the software reliability based on the number of errors detected. For correct and precise evaluation of reliability of certain software, the reliability model, which is considered to fit dose to real data should be selected as well. In this paper, the optimal model for specific test data was selected one of among five software reliability growth models based on NHPP(Non Homogeneous Poission Process), and in result reliability estimating scales(total expected number of errors, error detection rate, expected number of errors remaining in the software, reliability etc) could obtained. According to reliability estimating scales obtained, Software development and predicting optimal release point and finally in conducting systematic project management.

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Reliability Growth Analysis for In-service PCS Telecommunication System (PCS 교환기의 In-service 신뢰도 성장 분석)

  • Jung, Won;Chang, Soon-Tae
    • Journal of Korea Society of Industrial Information Systems
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    • v.5 no.4
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    • pp.39-46
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    • 2000
  • New products often have in-service reliability problem despite an intensive development program. Therefore reliability data must be collected and analyzed, and improvements designed and implemented. A type of reliability incentive contract which has recently attracted a lot of attention is reliability improvement warranty(RIW). It has been employed by military, airlines, telecommunication systems, and public utilities. An RIW contract requires that the supplies carries out all repairs, modify the equipment to improve its reliability, and provides all spates needed, for a fixed period, for once-off fee. This paper presents the reliability growth analysis and management methods for in-service MC68 microprocessor, which is the main component of the base station controller in PCS(Personal Communication Service) telecommunication system. The methods will provide guidelines to monitor reliability program in planning RIW contract.

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A Study on the Software Reliability of Operational Stage S/W (운영중인 소프트웨어의 신뢰도에 관한 연구)

  • Che, Gyu-Shik
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.13 no.3
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    • pp.445-450
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    • 2009
  • One method to improve quality before releasing of S/W after development is to enhance the reliability, whose direct methodology is to detect and revise fault through testing. Once the S/W is released because it meets the target reliability, the operational reliability problem arises. It is obvious the operational reliability different from that of testing stage depending on the condition whether it is universal(package) S/W or dedicated S/W. I propose the methodology to calculate operational software reliability of universal and dedicated S/W in this paper.

Practical Application of AMSAA Model in the Product Development Process (제품개발 과정에서 AMSAA 모델의 실용적 활용방법)

  • Jung, Won;Kim, Jun-Hong
    • IE interfaces
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    • v.19 no.1
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    • pp.19-25
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    • 2006
  • In the development process, the objective of a reliability growth program is to track the increase in system reliability, and determine as early as possible whether or not the system reliability is growing at a sufficient rate to meet the required goal and allocate available resources accordingly. Implementation of this kind of program will provide very useful information on concept selection, product/process reliability, and cost effectiveness without too much time, money and engineering effort being spent on the development of failure suspect parts. The purpose of this research is to present a practical method for efficiently monitoring a reliability growth test process using AMSAA(Army Materiel Systems Analysis Activity) reliability growth model. The presented growth management is a viable method for identifying failure modes, incorporating design changes and monitoring reliability progress on an on-going basis during the early stages of a product development program.

Development of Reliability Measurement Method and Tool for Nuclear Power Plant Safety Software (원자력 안전 소프트웨어 대상 신뢰도 측정 방법 및 도구 개발)

  • Lingjun Liu;Wooyoung Choi;Eunkyoung Jee;Duksan Ryu
    • The Transactions of the Korea Information Processing Society
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    • v.13 no.5
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    • pp.227-235
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    • 2024
  • Since nuclear power plants (NPPs) increasingly employ digital I&C systems, reliability evaluation for NPP software has become crucial for NPP probabilistic risk assessment. Several methods for estimating software reliability have been proposed, but there is no available tool support for those methods. To support NPP software manufacturers, we propose a reliability measurement tool for NPP software. We designed our tool to provide reliability estimation depending on available qualitative and quantitative information that users can offer. We applied the proposed tool to an industrial reactor protection system to evaluate the functionality of this tool. This tool can considerably facilitate the reliability assessment of NPP software.

Data Structure Modeling for the LCC Analysis of the Plate Girder Bridge Considering Corrosion (부식을 고려한 판형교의 LCC 분석 데이터구조 설계)

  • Kim, Dong-Hyun;Kim, Bong-Geun;Lee, Sang-Ho
    • 한국방재학회:학술대회논문집
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    • 2007.02a
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    • pp.497-500
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    • 2007
  • Data structure was designed not only to estimate LCC but also to analyze time-variant reliability index of plate girder bridges. Information model for data structure was categorized into cost information, cost variable information, user cost information, and reliability analysis information according to the characteristic of data. EXPRESS language of STEP was adopted to describe the data structure for the electronic representation of LCC information. The suitability of the developed data structure was verified by estimating LCC and analyzing time-variant reliability index of a plate girder bridge considering corrosion on the basis of the constructed test database.

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