• 한국시뮬레이션학회논문지
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• 제3권1호
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• pp.89-98
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• 1994

In this paper, a criteria for selecting an appropriate load redistribution algorithm is devised so that a fault-tolerance distributed system can operte at its optimal efficience. To present the guideline for selecting redistributing algorithms, simulation models of fault-tolerant system including redistribution algorithms are developed using SLAM II. The job arrival rate, service rate, failure and repair rate of nodes, and communication delay time due to load migration are used as parameters of simulation. The result of simulation shows that the job arrival rate and the failure rate of nodes are not deciding factors in affecting the relative efficiency of algorithms. Algorithm B shows relatively a consistent performance under various environments, although its performance is between those of other algorithms. If the communication delay time is longer than average job processing time, the performance of algorithm B is better than others. If the repair rate is relatively small or communication delay time is longer than service time, algorithm A leads to good performance. But in opposite environments, algorithm C is superior to other algorithms.

• 한국철도학회논문집
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• 제8권5호
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• pp.434-438
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• 2005

In this paper, as the first step to assess and enhance the reliability of Korea High Speed Train, an electric traction system is selected and reliability analysis is carried out. The electric traction system is classified into subsystems and functional block diagrams and reliability block diagrams are drawn. Expressions for evaluating the reliability are derived and Mean Kilometer Between Service Failure is calculated using the trial track test results. The calculation results show reliability growth of the proposed system.

• 한국통신학회논문지
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• 제29권10B호
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• pp.841-848
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• 2004

네트워크 상에 장애가 발생 시에는 서비스들의 Qos 요구사항을 만족시킬 수 있는 또 다른 백업 경로를 사용하여 서비스해야 한다. 따라서 본 논문에서는 IP 네트워크 상에 발생된 단일 회선 장애를 위해 simple PFC(5-PFC) 기법과 다중 회선 장애를 위한 iterative PFC(i-PFC) 그리고 라우터와 같은 노드 장애를 복구하기 위한 fault_node Avoidance PFC(a-PFC) 기법들을 제안하고 이를 기반으로 Direct_destination Rerouting(DR) 기법을 최소 재라우팅 비용 문제를 통해 성능 비교 분석하기로 한다.

• 한국시뮬레이션학회논문지
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• 제7권2호
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• pp.33-43
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• 1998

To evaluate the server performance and forecast capacity requirements, we carry out simulation of Multimedia-on-demand(MOD) server. In multimedia service environment, especially for on-demand service, one of the key problems is capacity planning, which requires ensuring that adequate computer resources will be available to meet the future workload demands in a cost-effective manner. In this paper, we design and implement a simulation model for MOD server with failures of components (e.g., processors, disks and networks). By acquisition of utilization and queue length parameters, we can estimate desirable capacity of server components with various arrival rates of customers and failure rates of components. For a given failure probability, we also compute packet delay probability and reliability of the server. It is possible to derive some important design information of the MOD server by using the above parameters.

• 품질경영학회지
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• 제42권1호
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• pp.1-14
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• 2014

Purpose: In this paper, the minimal repair-replacement warranty policy is used to carry out a warranty cost analysis with warranty servicing times and failure times that are statistically correlated to bivariate distributions. Methods: Based on the developed approach by Park and Pham (2012a), we investigate the property of the Freund's bivariate exponential distribution and obtain the number of warranty services using the field data to conduct the warranty cost analysis. Results: Maximum likelihood estimates are presented to estimate the parameters and the warranty model is investigated using a Freund's bivariate exponential distribution. A numerical example is discussed to deal with the applicability of the developed approach in the paper. Conclusion: A novel approach of analyzing the warranty cost is proposed for a product in which failure times and warranty servicing times are used simultaneously to investigate the eligibility of a warranty claim.

• Structural Monitoring and Maintenance
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• 제2권2호
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• pp.133-143
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• 2015

Civil engineering infrastructure is aging and requires cost-effective maintenance strategies to enable infrastructure systems operate reliably and sustainably. This paper presents an approach for determining risk-cost balanced repair strategy of corrosion damaged reinforced concrete structures with consideration of uncertainty in structural resistance deterioration. On the basis of analytical models of cover concrete cracking evolution and bond strength degradation due to reinforcement corrosion, the effect of reinforcement corrosion on residual load carrying capacity of corroded reinforced concrete structures is investigated. A stochastic deterioration model based on gamma process is adopted to evaluate the probability of failure of structural bearing capacity over the lifetime. Optimal repair planning and maintenance strategies during the service life are determined by balancing the cost for maintenance and the risk of structural failure. The method proposed in this study is then demonstrated by numerical investigations for a concrete structure subjected to reinforcement corrosion. The obtained results show that the proposed method can provide a risk cost optimised repair schedule during the service life of corroded concrete structures.

• 한국조리학회지
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• 제11권3호
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• pp.103-120
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• 2005

The purpose of this study was to identify the customer dissatisfaction types by demographic characteristics, and examine the effort of service recovery justice on the customers' satisfaction, in order to construct the efficient recovery system fer the restaurant service failure. Also, another purpose of this study was to analyze the effect of customer satisfaction on the word of mouth and the repurchase, and so devise the information measures for the positive relationship between the customers and the domestic restaurants. According to the results of this study, the customer evaluation on service recovery could be explained by the concept of justice. Also, this justice influenced the overall satisfaction on service recovery, and further the satisfaction on service recovery influenced the subsequent positive word of mouth or repurchase intention.

• 한국경영과학회지
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• 제29권2호
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• pp.1-18
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• 2004

Due to the change to the digital environments, the offer of services on the on-tine differs from one on the on-line. This paper Identifies what functions internet business organizations should fulfill to provide on-line services of good qualify and analyzes whether these functions lead effectively to the expected performance of Internet business firms. The components of service orientation in the Internet business organizations appear to be the servant leadership, customer treatment from the Internet service encounter, Internet service failure prevention and recovery, Internet service standards communication, Internet service training, and internet service rewards. Therefore, these determinants should be incorporated in the practices, Procedures, end routines of Internet business organizations in order to create and provide excellent Internet services. Furthermore, it is demonstrated that Internet service orientation has a significant effect on satisfaction by employees and customers, the value and quality of Internet service, and the firm's performance. This implies that the service orientation is an Important factor In the on-line service organizations and that the internet business can be successful when the service orientation is diffused throughout the firm's organizations. It is also shown that the important factors, which connect Internet service orientation and its performance, are the service quality, value of Internet service and customer satisfaction. That is, the service orientation can ultimately lead to the corporate performance when customers are satisfied after confirming the value and quality of Internet service by visiting the web site.

• 예술경영연구
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• 제54호
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• pp.95-132
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• 2020

국악공연은 타 공연예술 장르와 비교하여 낮은 유료관객 비중, 관람객 연령대의 편중 등 여러 가지 문제점을 나타내고 있다. 선행연구들에서는 이러한 문제점을 해결하기 위해서는 소비자에 대한 분석이 필요함을 지적하였지만, 주로 일원적 차원에서 공연 서비스 품질이 관람 만족에 미치는 영향을 파악하는데 머물렀다. 그러나 소비자들의 기대를 충족시키기 위해서는 소비자의 만족 요인을 파악하는 것뿐만 아니라, 공연 이전에 서비스 실패가 발생할 수 있는 요인들을 파악하여 대응방안을 마련하고 지속적으로 관리해나가는 것이 중요하다. 본 연구에서는 Kano-Timko 모형을 이용하여 국악공연 서비스 품질요인을 분류하고, 잠재적 고객만족지수를 통해 국악공연의 서비스 실패 지점을 확인하고 우선 개선순위를 파악하였다. 연구 결과, 국악공연의 출연진 실력, 작품 완성도, 직원의 친절함에서 서비스 실패가 발생하고 있는 것으로 나타났다. 본 연구 결과를 통해 국악 공연기관 및 단체가 국악공연에서 발생하고 있는 서비스 실패에 대한 사전적 대응방안을 마련하고, 고객의 만족을 이끌어 내기 위한 효과적인 운영 전략을 수립할 수 있을 것이다. 또한 서비스 실패의 개념을 적용하여 일원적 차원에서만 파악되었던 공연 서비스 품질을 Kano모형을 바탕으로 분류하고자 했다는 점에서 학문적 의의가 있을 것이다.

• 품질경영학회지
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• 제29권1호
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• pp.61-84
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• 2001

The problem of trend change in the failure rate is great interest in the reliability and survival analysis. In this paper we develop a test statistic for testing whether or not the failure rate changes its trend based on a complete sample. Monte Carlo simulations are conducted to investigate the speed of convergence of the proposed test statistic.