• The Journal of Korea Institute of Information, Electronics, and Communication Technology
• /
• v.11 no.4
• /
• pp.325-330
• /
• 2018

This paper, following the shape parameters of the minimax distribution, describes the special form of the beta distribution, the Minimax distribution, as a function of the shape parameters for the software reliability model based on the non-homogeneous Poisson process. Characteristics and usefulness were discussed. As a result, the case of the shape parameter 1 of Minimax distribution than less than and greate in mean squared error is the smallest, in determination coefficient, appears to be high, the shape parameter 1 of Minimax distribution regard as an efficient model. The estimated determination coefficient of the proposed model is estimated to be more than 95%, which is a useful model in the field of software reliability. Through this study, software design and users can identify the software failure characteristics using mean square error, decision coefficient, and confidence interval can be used as a basic guideline.

• KSCE Journal of Civil and Environmental Engineering Research
• /
• v.36 no.6
• /
• pp.1059-1068
• /
• 2016

The current operation method for the AVC (Automatic Vehicle Classification) equipment does not generate vehicle speed, traffic volume and vehicle type information when part of the sensors has failed. Inefficiency of current methods would not use the collected data from the normal sensor. In this study was conducted research on the calculating method at the traffic volume and vehicle speed in the sensor failure AVC equipment. The failure situation of the sensor was classified into 4 types. Calculating the traffic volume and vehicle speed information for each type, and accuracy of these informations were analyzed. Analysis results, traffic volume was possible to calculate a highly accurate value (accuracy: 100%, 98%, 97%). In the case of speed, the accuracy of the calculated speed value reaches a level that can be accepted sufficiently (RMSE value is less than 16.8). So, using the methodology proposed in this study are expected to be able to increase the operational efficiency of the AVC equipment.

• Journal of the Korea Institute of Information and Communication Engineering
• /
• v.6 no.5
• /
• pp.661-666
• /
• 2002

We need the flexible method for communication network configuration and fault management business procedure. Therefore development of systematic integrating fault management system is essential to meet on these requests. We must design the integrating fault management system so that can run the repair processing for both data communication network management and new next generation data communication network of various type. In general it is effective that the system is consisted of decentralized module to be accessibele for business logic and datum to remote area. To Solve these problem, a method is to use object-oriented design technique. That is, it is to abstract reusability objects and make component module using the abstracted objects. In this paper, we propose a fault management system of communication network service using object-oriented design techniques which are UML(Unified Modeling Language) and EJB(Enterprise Java Bean).

• The Transactions of the Korean Institute of Power Electronics
• /
• v.16 no.1
• /
• pp.79-87
• /
• 2011

The fault detection technique of the grid-connected photovoltaic system using wavelet transform has been suggested in this paper. The additional hardware and sensors are required to detect the inverter failure in the conventional method, and it has the disadvantage of high cost and re-design problem if the inverter specification has been changed. The suggested method used the inverter voltage and current waveform to detect the failure and the location by the wavelet coefficients variations. The prompt and accurate diagnostic function is possible using the normalized standard deviation method. The merit of the proposed method is the simple calculation and precise diagnostic capabilities of the fault detection. The computer simulation is performed and the experimental result verifies the validity of the proposed method.

• Journal of Korean Academy of Nursing Administration
• /
• v.21 no.3
• /
• pp.254-262
• /
• 2015

Purpose: This study was done to apply failure mode & effect analysis (FMEA) to chemotherapy in order to reduce prescribing, dispensing and administering errors related to treatment and provide patients with a safe medical environment. Methods: A one group pre-post test design was used to verify the effects using the tool for FMEA in chemotherapy. Results: There was a statistically significant decrease in prescribing errors from 11.47% to 3.18%; administering errors decreased but they were not statistically significant. In a addition, there was no change in dispensing errors. Conclusion: The results show that FMEA removed risk factors that might occur during the process of chemotherapy and that it was an effective tool for prevention of negligent accident occurring in actual patients.

• Bulletin of the Korea Photovoltaic Society
• /
• v.1 no.1
• /
• pp.42-48
• /
• 2015

태양광발전시스템 기술은 태양광모듈-접속함-PCS가 포함되는 BOS 기술로부터 시작되어 독립형 또는 계통연계형으로 전력을 생산하게 하는 설치, 운전, 운영기술이 모두 포함된다. 태양광 밸류체인 기술마다 급속한 산업 성장으로 단가경쟁력이 치열한 요즘 태양광발전시스템 기술은 설치단가, 발전단가를 낮출 수 있는 최후의 마지막 수단이라고 생각하고 시스템 설치단가, 운영단가를 낮추기 위해 많은 연구를 수행 중에 있다. 그러나, 태양광발전시스템 기술이 정상적으로 완성되지 못하면 경제적 손실은 물론, 내구성능과 수명, 민원에 의한 분쟁, 사고 등 다양한 고통을 겪게 된다. 본고에서는 이러한 태양광발전시스템에 대한 다양한 고장 사례와 민원 분쟁 유형을 진단하고, 그에 대한 해결방안을 제시하고자 한다.

• Journal of the KSME
• /
• v.54 no.7
• /
• pp.28-33
• /
• 2014

최근 풍력에너지 발전기술이 해상 풍력 및 대형 풍력으로 천이되어 감에 따라 더 향상된 신뢰성 기술을 요구하고 있고, 풍력 블레이드는 풍력발전시스템에서 고장 빈도가 비교적 낮지 않고, 고장 발생 시 심각도가 상대적으로 높아 신뢰성을 고려해야 하는 부품이다. 블레이드 제작 생산 과정과 사용 중에 발생하는 손상 및 결함은 신뢰성의 심각성에 큰 영향을 미치고 있어 본 기술에서는 블레이드에서 발생할 수 있는 결함 유형, 결함을 탐지하는 기술 그리고 신뢰성을 평가하는 시험/평가 기술에 대하여 소개하고자 한다.

• 전기의세계
• /
• v.39 no.2
• /
• pp.3-11
• /
• 1990

원전의 전기설계는 원전소내 보조기기에 전원을 확보하기 위해 첫째는 계통으로 부터 독립된 2개 회로와 둘째는 유니트 당 2대의 소내전원으로 구성한다. 이에 더하여 계통 고장시 보조기기의 전원을 주발전기로부터 수전하는 소내부하 운전을 가능케 해두고 있다. 또한 안전 기준으로 검토된 단일사고 기준과 공통유형고장 기준에 대한 대응설계로서 다중성과 독립성이 강조되었고 이러한 적절한 설계에도 불구하고 궁극적으로 인명의 손항방지와 기기의 안전성 유지를 위한 원전의 신뢰는 능동기기(Active Component)에 의존하게 되므로 기기의 성능검증(euqipment qualification) 활동이 필연적으로 뒷받침 되고 있다.

• Journal of the KSME
• /
• v.43 no.6
• /
• pp.66-69
• /
• 2003

이 글에서는 제품의 고장 및 신뢰성과 밀접한 관계가 있는 재료의 역할과 기능에 대해 알아보고 특히 파손의 원인 및 유형, 기구, 분석방법 등을 통하여 제품의 신뢰성 설계를 위한 재료파손과 재료거동분석의 중요성을 소개하고자 한다.

• Journal of Korea Multimedia Society
• /
• v.15 no.1
• /
• pp.115-130
• /
• 2012

These days, most of safety-critical systems, which are systems those failures or malfunction may result in death or serious injury to people, or loss or severe damage to social systems, or environmental harm, are being built of embedded software or loaded controlling software systems on computers, electrical and electronic components or devices. There are a lot kind of fault analysis methods to evaluate safety of the safety-critical systems equipped computers, electrical and electronic components or devices with software. However, the only assessment method to evaluate software safety of a safety-critical system is not enough to analysis properly on account of the various types and characteristic of software systems by progress of information technology. Therefore, this paper proposes the integrated evaluation method and carries out a case study for the software safety of safety-critical system which embedded or loaded software sizes are small and control response times are not sensitive by use of two security analysis methods which are Fault Tree Analysis (FTA) and Fault Modes and Effect Analysis (FMEA) for ubiquitous healthcare system.