• Title/Summary/Keyword: Distribution service

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Approximation of M/G/c Retrial Queue with M/PH/c Retrial Queue

  • Shin, Yang-Woo;Moon, Dug-Hee
    • Communications for Statistical Applications and Methods
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    • v.19 no.1
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    • pp.169-175
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    • 2012
  • The sensitivity of the performance measures such as the mean and the standard deviation of the queue length and the blocking probability with respect to the moments of the service time are numerically investigated. The service time distribution is fitted with phase type(PH) distribution by matching the first three moments of service time and the M/G/c retrial queue is approximated by the M/PH/c retrial queue. Approximations are compared with the simulation results.

A Study on the Customers' Service Expectation Level: The Effects of Distribution Service Excellence Awards for an Airport (공항의 기대서비스 수준에 관한 연구: 유통서비스기관 평가결과의 효과를 중심으로)

  • Chun, Jeong-Lee;Park, Sang-Beom
    • Journal of Distribution Science
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    • v.16 no.11
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    • pp.47-56
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    • 2018
  • Purpose - In this research, the expectation level of service of Incheon International Airport was investigated. Service expectation level is critical to the customers' satisfaction and should be managed. Regarding the expectation level of service, the concepts have been defined and introduced by some researchers including Zeithaml, Berry, and Parasuraman (1993). However, due to the difficulties of measuring the level, researches on the expectation level of service have been limited. The main reason of difficulties of measuring the effects is that desired service, adequate service, perceived service, predicted service which are the conceptual components of the expectation level of service are psychologically described concepts and thus are hard to set up standards and to measure numerically. All that one can discern is that desired service level is higher than adequate service level or perceived service level is lower than predicted service level under the certain conditions, etc. Research design, data, and methodology - In this research, the level of service and factors affecting the level are investigated using the case of an Airport. The main idea of research is to investigate whether a supposed factor that is alleged to affect the expected service level is working empirically. The supposed factor is service provider's promise to provide certain level of service to customers. Results - The research results can be summarized as follow. First, service provider's promise, in this case the Airport's Service Quality Award by Airports Council International which can be regarded as objective promise to provide the certain level of service to customers is turned out to be influential to factors affecting expectation level of service. Second, service provider's promise affects to move the customers' expectation level of service upward especially the service of delivering the necessary information to customers in the airport correctly and swiftly. Conclusions - The implications of the research results are, first, customers' expectation level of service in influenced by service provider's promise, second, airport's service award increases the level of customers' service level and as a result for the airport to meet the customers' expectation level of service more efforts should be made.

A New Algorithm of The Line to Ground Fault Section Isolation & Restoration in Ungrounded Distribution Power System (비접지 배전 계통에서 지락사고 시 고장구간 분리 및 복구를 위한 새로운 알고리즘)

  • Choi In. S.;Choi Myeon. S.;Lim Seong. I.;Lee Seung. J.
    • The Transactions of the Korean Institute of Electrical Engineers A
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    • v.53 no.10
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    • pp.550-555
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    • 2004
  • Fault section isolation and service restoration are very important for function of DAS. In Japan, a progressive protection method is used for the line to ground fault section isolation and service restoration. But the progressive protection method has a drawback that the customer will experience outage time and that the rate in use of the feeder is not over 50%. This paper presents a new Service Restoration Algorithm which is for the line to ground fault section isolation and service restoration method for a ungrounded distribution system. If the proposed algorithm is used, the rate in use of the feeder can improve than before because a distribution system can change multi connection of feeder and the customer's outage time can be reduced. The proposed algorithm has been successfully tested in a distribution system.

A New Evaluation Methodology of Service Restoration Capability in Distribution Systems (배전계통 복구능력 평가방안 및 응용)

  • Im, Seong-Il;Jin, Bo-Geon;Lee, Seung-Jae
    • The Transactions of the Korean Institute of Electrical Engineers A
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    • v.51 no.7
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    • pp.333-340
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    • 2002
  • To secure a service continuity is one of the most important mission in the ower distribution system operation. In this paper the necessary and sufficient condition to guarantee 100% service restoration capability for any fault on the system is reported. An evaluation methodology of the restoration capability(or restorability) is developed based on the developed restoration conditions. Applications of the developed concept to the system operation in the normal and emergency states, that would enhance the supply reliability of the system are described. They include enhancement of restoration capability adapting to load change, identification of best open switch and supervised switch positions.

Service Restoration Considering Load Balancing In Distribution Networks (부하균등화를 고려한 배전계통의 정전복구)

  • 최상열;김종형;신명철
    • The Transactions of the Korean Institute of Electrical Engineers A
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    • v.52 no.9
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    • pp.513-520
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    • 2003
  • Service restoration is an emergency control in distribution constrol centers to restore out-of-service area as soon as possible when a fault occurs in distribution networks. therefore, it requires fast computation time and high quality solutions for load balancing. In this paper. a load balance index and heuristic guided best-first search are proposed for these problem. The proposed algorithm consists of two parts. One is to set up a decision tree to represent the various switching operations available. Another is to identify the most effective the set of switches using proposed search technique and a load balance index. Test results on the KEPCO's 108 bus distribution system show that the performance is efficient and robust.

Design and Implementation of Data Distribution Service based on Real-Time Operating System (실시간 운영체제에서 Data Distribution Service 설계 및 구현)

  • Jeong, Gun-Jae;Lee, Cheol-Hoon
    • Proceedings of the Korean Information Science Society Conference
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    • 2006.10a
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    • pp.395-398
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    • 2006
  • 임베디드 시스템의 발달로 인해 기존의 컴퓨팅 패러다임(Paradigm)이 모바일이나 웨어러블 컴퓨팅 등 임베디드 환경으로 급격하게 변화하고 있다. 이렇게 컴퓨팅 패러다임이 변화해도 정보 서비스에 대한 기술이 여전히 필요하다. 네트웍 환경에서 많이 사용하고 있는 정보 서비스 기술중의 하나인 Data Distribution Service(DDS)는 간단한 통신 메커니즘을 기반으로 하면서도 높은 성능으로 정보 서비스를 제공할 수 있다. 따라서, 본 논문에서는 실시간 운영체제를 사용하는 내장형 시스템에 Data Distribution Service(DDS)를 적용하여 데이터의 수집과 전송을 효율적으로 사용하게 하였다.

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A Study on the Restoration Algorithm For Multi-Outage Areas in distribution system (광역고장을 고려한 정전 복구 알고리즘 연구)

  • Jung Jin Soo;Moon Hyun Kyung;Lim Seong Il;Lee Seung Jae
    • Proceedings of the KIEE Conference
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    • summer
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    • pp.381-383
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    • 2004
  • This paper presents for service restoration Abstract -in electric power distribution systems. The aim of the service restoration is an emergency control in distribution system to restore out-of service areas as soon as possible when a fault occurs in distribution system. For this reason, this paper presents a new service restoration strategy for multi-outage areas. Proposed algorithm consists of two methods. One is individual restoration scheme, the other one is integrated restoration scheme. The former determines restoration order of outage areas based on restoration index. If the former method can not generate a feasible restoration plan, the latter would try to find new configuration without overloaded section through tie exchange method.

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Distribution Strategies for Service Delivery: Focus on Verbal and Non-verbal Communication at Counter Service Restaurants

  • CHOI, Jinkyung
    • Journal of Distribution Science
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    • v.20 no.3
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    • pp.45-52
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    • 2022
  • Purpose: This study investigated the impact of staff verbal and non-verbal communication on consumer satisfaction and revisit intention. The study sought to identify differences in demographic and eating out characteristics on perceived verbal and non-verbal communication. Research design and methodology: This study used a survey method to collect data. The questionnaire asked about previous experience with verbal and non-verbal communication with staff at a counter service restaurant. The study measured degrees of perceived verbal and non-verbal communication. In addition, the effect of verbal and non-verbal communication on satisfaction and revisit intention was measured. The principal results: Results of ANOVA showed significant differences in monthly income on verbal communication and monthly income and budget for dining out on verbal and non-verbal communication. Both verbal and non-verbal communication affected satisfaction and revisit intention significantly with slightly more power of verbal communication than non-verbal communication. Major conclusions: Results of this study suggest that consumers are affected by both verbal and non-verbal communication. Staff communication is critical to increasing consumer satisfaction and revisit intention; hence, training staff in effective communication is necessary.

Generation YZ's E-Healthcare Use Factors Distribution in COVID-19's Third Year: A UTAUT Modeling

  • Michael CHRISTIAN;Kurnadi GULARSO;Prio UTOMO;Henilia YULITA;Suryo WIBOWO;Sunarno SUNARNO;Rima MELATI
    • Journal of Distribution Science
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    • v.21 no.7
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    • pp.117-129
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    • 2023
  • Purpose: With the number of COVID-19 cases declining and generational differences among how people use mobile apps, including health service apps, the goal of this research is to identify and analyze the factors that affect people's attitudes when using the Halodoc health service app during the third year of the pandemic. Research design, data, and methodology: This study proposes a quantitative analysis method based on PLS-SEM modeling. This study has used a questionnaire survey to collect randomized data from 268 Halodoc users from generations Y and Z in Jakarta. Results: Both the Y and Z generations believe there is a significant usefulness factor in the attitude toward using the application. The start of the pandemic period demonstrates that the urgency of using health service applications is no longer determined by performance expectations, effort, or social panic, but rather by these applications' usability. Conclusions: Even though a health service application is no longer considered an urgent service or a priority need, attitudes, and behaviors in using it emphasize the aspect of long-term benefits. These findings supplement other considerations and understandings in application of the Unified Theory of Acceptance and Use of Technology (UTAUT) model in explaining attitudes and intention behaviors.

The Digital Loyalty Equation in Distribution Science: A Multi-method Exploration of E-commerce Success Factors

  • Vu Hiep HOANG;Quoc Dung NGO;Anh Kiet MAI;Huynh Mai LE
    • Journal of Distribution Science
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    • v.22 no.9
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    • pp.13-25
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    • 2024
  • Purpose: This study explores the complex interplay between service quality, customer engagement, and loyalty in the e-commerce sector, examining the moderating effect of technological adoption on these crucial relationships. Research design, data and methodology: Employing a robust multi-method approach, the research analyzes data from 481 e-commerce users, leveraging the complementary strengths of partial least squares structural equation modeling (PLS-SEM) and fuzzy-set qualitative comparative analysis(fsQCA). Acomprehensive multi-group analysisis conducted to uncover differences between experienced and non-experienced users. Results: PLS-SEM reveals that service quality significantly influences customer engagement, which in turn drives loyalty. Technological adoption positively moderates the service quality-engagement relationship. The multi-group analysis uncovers notable differences between user segments. fsQCA identifies two distinct configurational paths consistently leading to high customer loyalty: high customer engagement and high service quality. Conclusions: This study's innovative integration of PLS-SEM and fsQCA contributes to a deeper understanding of the intricate dynamics driving e-commerce success. Findings provide actionable insights for e-commerce businesses to enhance service quality, foster engagement, and cultivate loyalty. This research lays the groundwork for further exploration of these critical relationships in different contexts, offering a nuanced perspective on the complex interplay of factors shaping customer behavior in the digital marketplace.