• 한국통신학회논문지
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• 제42권1호
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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.

• 디지털융복합연구
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• 제14권9호
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• pp.181-198
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• 2016

본 연구는 국내 외국인 카지노 이용자를 위한 카지노 정보시스템의 성과요인을 파악하고, 이들 요인들이 조직 신뢰와 직무만족을 통하여 경영성과에 영향을 미치는 인과관계를 실증적으로 검증하여, 카지노 정보시스템의 발전방안을 제시하고자 한다. 연구결과 첫째, 정보 품질은 보안 신뢰와 직무 만족에 유의 수준에서 채택되는 것으로 나타났다. 둘째, 시스템 품질은 보안신뢰와 직무 만족에 유의 수준에서 채택되는 것으로 나타났다. 셋째, 서비스 품질은 보안 신뢰와 직무 만족에 유의 수준에서 채택되는 것으로 나타났다. 넷째, 보안신뢰는 직무만족에 유의 수준에서 채택되는 것으로 나타났다. 다섯째, 보안 신뢰와 직무 만족은 경영성과에 유의 수준에서 채택되는 것으로 나타났다. 향후 연구 방향은 본 연구의 각 변수들을 확장하여 연구를 지속적으로 진행해야 하며, 카지노 정보시스템의 경영 성과를 다 방향으로 분석할 수 있는 방법과 탈세 방지를 위한 시스템을 분석하는 연구가 필요할 것이다.

• Journal of Communications and Networks
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• 제14권6호
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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.

• 한국신뢰성학회지:신뢰성응용연구
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• 제9권2호
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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.

• 정보교육학회논문지
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• 제2권1호
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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.

• 한국산업정보학회논문지
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• 제5권4호
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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.

• 한국정보통신학회논문지
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• 제13권3호
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• pp.445-450
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• 2009

소프트웨어를 개발하여 발행하기 전에 품질을 향상시키는 방법으로서 신뢰도를 향상시켜야 하는데, 이의 직접적인 방법으로서는 테스트에 의해 결함을 검출하고 수정해 가는 것이다. 신뢰도가 목표치에 도달하여 발행했을 때, 운영중의 신뢰도 문제가 발생하게 된다. 개발 발행된 소프트웨어 패키지소프트웨어라 불리는 범용소프트웨어냐, 아니면 특수목적을 가진 전용소프트웨어냐에 따라 운영 소프트웨어의 신뢰도가 달라진다. 본 논문에서는 범용소프트웨어와 전용소프트웨어의 운영중의 신뢰도를 산출하는 방법을 제안하고자 한다.

• 산업공학
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• 제19권1호
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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.

• 정보처리학회 논문지
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• 제13권5호
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• pp.227-235
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• 2024

원자력발전소에서 디지털 계측제어 시스템 비중이 높아지면서 원자력발전소에 대한 확률론적 안정성 평가 시 소프트웨어에 대한 신뢰도 평가가 중요해졌다. 원전 소프트웨어 신뢰도 추정을 위한 방법들이 몇 가지 제안 되었지만 해당 방법의 효과적 적용을 지원하는 도구 지원이 미비하였다. 본 연구에서는 소프트웨어 개발 품질 및 검증 품질과 같은 정성적 정보와 통계적 시험 결과와 같은 정량적 정보를 활용하여 원전 소프트웨어 신뢰도를 정량적으로 측정할 수 있는 자동화 도구를 설계하였고 구현하였다. 개발된 도구를 산업용 원자로 보호 시스템 사례에 적용한 결과, 개발된 도구가 원전 소프트웨어의 신뢰성 평가를 효과적으로 지원할 수 있음을 확인하였다.

• 한국방재학회:학술대회논문집
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• 한국방재학회 2007년도 정기총회 및 학술발표대회
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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.