• 한국통신학회논문지
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• 제21권8호
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• pp.1989-2002
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• 1996

In this paper, we describe several warm standby fault-tolerant models and their operation methods applicable to telephone switching control systems which have dual module structure and need high availability. Unavailabilities of the system implemented by four different methods for each model are computed by using the Markov state model, and then are compared for system performance evaluation. As the results ofsimulations, the warm standby model with triple processors is best in the aspect of data loss, while in most cases the warm standby model with doble processors based on no standby check method provides the highest system avaiability. Periodic changeover increases the system unavailability, but the preriodic standby check on standby module decreases the system unavailability of warm standby model with a single processor and with double processors. On the other hands, the variationas of warm standby model with a single processor and with double processors. On the other hand, the variations of data recovery time and personnel recovery rate have little effect on the system unavailtability.

• 가정과삶의질연구
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• 제17권1호
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• pp.73-86
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• 1999

The aim of this study is to suggest theoretical foundations on which hospital employees could estimate medical care services not in the position of providers but consumers. For this purpose this study compares satisfaction of providers but consumers. For this purpose this study compares satisfaction of patients with medical care service with that of hospital employees. 287 patients and 261 employees in three university hospitals in Daegu were selected as samples of investigation and asked questions. Statistical analysis was taken using SAS package. The result of this study are as follows. 1) Among the five fields of medical services patients and hospital employees have different views in doctor hospital staff(except doctor) treatment system availability service but parking service 2) Hospital employees overestimate the level of medical care services compared with patients 3) Demographical variables make a difference in medical satisfaction 4) In satisfaction-evaluation after r ceiving treatment medical system service is influential variables in both patients and hospital employees. And in patient group doctor service is following variables while availability and parking service is influential variables in employees.

• 한국신뢰성학회지:신뢰성응용연구
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• 제17권2호
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• pp.150-158
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• 2017

Purpose: The RAM objective is a very important factor that has a great effect on the improvement of the operation ration during the operation maintenance and the reduction of the life cycle cost. It is used as a design criterion during the system development, and its sufficiency should be evaluated during its test evaluation. Method: This study analyzed the cases related to RAM objective setting and suggested the improvement measures. Result: The base data for RAM objective is OMS/MP, which needs to be drawn up under the supervision of the requirement military, and a high-accuracy operating availability should be set through ALDT calculation which reflects the military logistics support environment. In addition, data collection necessary for RAM objective and RAM analysis should be made by supplementing the input data of DELIIS. Conclusion: This study suggests improvement of RAM objective considering for the weapon system.

• 한국국방경영분석학회지
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• 제27권1호
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• pp.89-100
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• 2001

Information technology has been made remarkable progress and most of computer systems are connected with internet over the world. We have not only advantages to access them easy, but also disadvantages to misuse information, abuse, crack, and damage privacy. We should have safeguards to preserve confidentiality, integrity and availability for our information system. Even tough the security is very important for the defense information system, we should not over limit users availability. BS7799, a British standard, is an evaluation criteria for information security management. In this paper we propose an audit model to manage and audit information security using control items of BS7799, which could be useful to mange the defence information system security. We standardize audit items, and classify them by levels, and degrees by using appropriate audit techniques / methods / processes.

• 정보관리연구
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• 제33권1호
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• pp.61-80
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• 2002

본 연구는 과학기술분야 해외 온라인 데이터베이스의 현황을 평가하고 조사한 것이다. 데이터베이스에 대한 평가는 과학기술정보 이용자나 정보 제공자에게 매우 중요한 과제로 인식되고 있다. 본 연구에서는 우선적으로 데이터베이스 평가에 대한 선행 연구를 간략하게 요약하였다. 그리고 현재 이용 가능한 해외 온라인 데이터베이스 618종을 대상으로 주제분야별, 발행처별, 갱신주기별, 온라인 이용방법별로 분석하였다. 또한 과학기술분야별로 주요한 온라인 데이터베이스를 간략하게 소개하였다.

• 한국문헌정보학회지
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• 제34권1호
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• pp.17-37
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• 2000

본 연구는 기존의 인쇄본 백과사전 평가이론에 근거하면서도 CD-ROM 백과사전에 적합한 체계적인 평가기준을 개발하여 우수한 CD-ROM 백과사전을 선정, 구입하기 위한 지침을 마련하는데 목적을 둔다. 따라서 본 연구에서는 CD-ROM 백과사전의 평가기준을 도서관에서 CD-ROM 백과사전을 선정, 구입하는데 필요한 평가과정에 따라 서평지의 평가, 기본이 되는 인쇄본 백과사전, 시험용 디스크의 이용가능성, 하드웨어의 요구사양과 소프트웨어 설치의 용이성, 데이터베이스의 내용, 검색 소프트웨어, 단독 사용형과 네트워크용, Standard판과 Deluxe판, 가격의 9가지 범주로 나누고 각 범주 아래에서 세부적인 평가요소와 항목을 제시하였다.

• Journal of Information Technology Applications and Management
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• 제20권2호
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• pp.57-68
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• 2013

Recently, cloud computing has been viewed as a technology of great influence. Despite the importance of personal cloud services, the majority of cloud computing studies has been focused on an enterprise level. Therefore, in this research, we list variables of personal cloud computing characteristics (accessibility, storage, trust, perceived ease of use, availability) from preceding research done on an enterprise level. So, through pilot testing, we analyze whether examined characteristic variables affect the intention to use personal cloud computing. Next, we investigate the relevancy between user characteristics, including gender, age, and occupation, and the usage rate of personal cloud computing. Lastly, we implement an analysis of variance in order to speculate whether there is any difference between the five characteristic variables in using personal cloud computing between cloud service enterprises. For empirical testing people with experience in personal cloud computing are surveyed. Frequency analysis, exploratory factor analysis, internal consistency analysis, T-test, ANOVA, and multiple regression analysis are implemented with 325 valid samples. The analysis results are as follows: First, among user characteristic variables, 'occupation' shows a significant relationship with cloud service usage, Second, between cloud service enterprises, all five characteristic variables of 'Naver N Drive' are thoroughly evaluated and 'Google Drive' receives a high evaluation in availability and accessibility. Third and finally, all of the selected characteristic variables affect the intention to use personal cloud computing. However, availability is identified to be the most important factor. This research will serve as a reference to enterprises for the practical implementation of personal cloud computing service.

• 농촌지도와개발
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• 제10권1호
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• pp.43-56
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• 2003

Evaluation in both an art and a science. The art of evaluation involves working with the management to agree upon purpose and users of results, creating design and gathering information that are appropriate for a specific situation and a particular policy making context. The value of evaluating extension p개grams has received a lot of attentions recently, and many extension educations see evaluation as an integral part of their work. The science of evaluation involves determining standards and developing indicatiors, selecting methods appropriate to gather information in a systematic way, analyzing information to assist in determining the value of the program in an objective manner. First, extension specialists have to consider relative merits about methods of gathering evaluation data. Selection of method should be influenced by the type of information desired, time availability, and cost of using the method. Second, good evaluations involve stakeholders at all stages including planning, implementation, and utilization of results. Third, far from being an "add-on ," evaluation begins with the initial planning of an educational program. Fourth, it is important for extension specialists that although evaluation is valuable and essential in any effective program, one of the biggest mistakes of extension program evaluators in to promise results that cannot possibly solve all the problems of project.

• Imaging Science in Dentistry
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• 제43권3호
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• pp.135-143
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• 2013

Purpose: This study was performed to obtain a quantitative evaluation of the cortical and cancellous bone graft harvestable from the mental and canine regions, and to evaluate the cortical vestibular thickness. Materials and Methods: This study collected cone-beam computed tomographic (CBCT) images of 100 Italian patients. The limits of the mental region were established: 5 mm in front of the medial margin of each mental foramen, 5 mm under the apex of each tooth present, and above the inferior mandibular cortex. Cortical and cancellous bone volumes were evaluated using SimPlant software (SimPlant 3-D Pro, Materialize, Leuven, Belgium) tools. In addition, the cortical vestibular thickness (minimal and maximal values) was evaluated in 3 cross-sections corresponding to the right canine tooth (3R), the median section (M), and the left canine tooth (3L). Results: The cortical volume was $0.71{\pm}0.23mL$ (0.27-1.96 mL) and the cancellous volume was $2.16{\pm}0.76mL$ (0.86-6.28 mL). The minimal cortical vestibular thickness was $1.54{\pm}0.41mm$ (0.61-3.25 mm), and the maximal cortical vestibular thickness was $3.14{\pm}0.75mm$ (1.01-5.83 mm). Conclusion: The use of the imaging software allowed a patient-specific assessment of mental and canine region bone availability. The proposed evaluation method might help the surgeon in the selection of the donor site by the comparison between bone availability in the donor site and the reconstructive exigency of the recipient site.

• 대한안전경영과학회지
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• 제16권2호
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• pp.31-42
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• 2014

As weapon systems become complex in terms of the scale and functionality, the required time to complete the test and evaluation (T&E) process is inevitably getting longer. However, nowadays the reduction of T&E period becomes one of the core targets in the weapon systems acquisition programs. This is because the reduced time for T&E process can yield the reduction of defense budget and also faster deployment of the weapon systems, thereby having a competitive edge over rival countries. On the other hand, in weapon systems development the management of reliability, availability, maintainability and safety (RAMS), and risk is considered important to keep competitiveness and thus has been carried out separately. Thus, the objective of this paper is to study on improving the T&E process by integrating the RAMS and risk management process in it. To do so, the related processes are analyzed and modeled first. Then an integrated process model is developed. The resulting model is equipped with the traceability among the data and interfaces that are generated from the T&E and RAMS/risk processes. As a case study, the model developed is applied in tanks development. The effective use of the traceability is expected to reduce the time and cost required to complete T&E process.