• 한국시뮬레이션학회논문지
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• 제12권3호
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• pp.83-94
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• 2003

For 24 hours-7 days service on distributed systems, a great deal of efforts are investigated on high availability for seamless operation. In this paper, we propose a dynamic reconfiguration framework of distributed systems, called "hot-swapping" framework. This framework allows us to upgrade and exchange a number of modules of a distributed system without stopping running service as well as the system itself. In order to hide the state of service operation, the framework employes the "proxy" design pattern. Our framework provides two types of proxies: a static proxy and a dynamic proxy, Static proxies can achieve fast execution time, but they need to be changed whenever any minor change exists in the related swappable module. Meanwhile, dynamic proxies takes longer execution time, but do not need to be changed under minor changes of swappable modules. We compare performances of static and dynamic proxies and also apply the framework to a real situation with security management modules. management modules.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2003년도 추계학술대회 논문집(III)
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• pp.634-639
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• 2003

The static inverter is mainly used to provide with the electric power of various loads in the train. In the recent european projects, the specification of static inverter become harder, and many additional service function is expected. It takes long time and high cost to develope a static inverter with these high performances and additional function. But, these are became general demands for static inverter in the many projects from now on. The APSE(Auxiliary Power Supply Equipment) is a static inverter of high performance to satisfy the severe specification and various service function following these tendency for Athens project In this paper, the specification of APSE and various service functions are introduced to look about current tendencies of static inverter.

• 한국컴퓨터정보학회논문지
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• 제21권1호
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• pp.49-57
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• 2016

In this paper we propose the resource allocation scheme for the overlaid macro-femtocell networks, which considers the type of handovers such as the inter-macrocell, macrocell-to-femtocell, femtocell-to-macrocell, or inter-femtocell in order to guarantee Quality of Service (QoS) and expand the accommodation capacity. Our proposed scheme takes into account the movement of mobile terminals, the QoS degradation, or the load control which trigger handovers in the overlaid networks, before it allocates resources dynamically. Moreover it considers QoS requirements of realtime or non-realtime mobile multimedia services such as video communication, Video on Demand (VoD) and dataa services. Simulation results show that our scheme provides better performances than the conventional one with respect to the outage probability, data transmission throughput and handover failure rate.

• 한국컴퓨터정보학회논문지
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• 제6권4호
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• pp.138-145
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• 2001

본 논문에서는 분산처리시스템에서 서버에 대한 작업의 서비스요구와 서버의 서비스율이 네트워크환경에 따라 모호성을 갖는 경우, 시스템의 성능을 평가할 수 있는 퍼지 폐쇄형 BCMP 큐잉네트워크모델을 제안하였다. 이 모델은 퍼지요소들을 처리할 수 있는 퍼지평균값분석방법을 사용하여 시스템성능을 평가할 수 있는 측도를 유도하였다. 이들의 유효함을 검증하기 위하여 제안한 모델에 작업의 서비스요구와 클라이언트의 수의 변화에 따른 성능평가를 시뮬레이션 하였고, 그 결과를 확인하였다.

• 한국통신학회논문지
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• 제15권3호
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• pp.243-251
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• 1990

본 논문에서는 광대역 ISDN용 대역폭 할당방식의 성능을 컴퓨터 시뮬레이션을 통하여 분석하였다. 일반적으로 처리율, 지연시간, 블럭킹 확률 특성면에서 보면 다중채널 대역할당 방식의 성능이 단일채널 대역할당 방식의 성능보다 우월하였다. 또한 FIFO 서비스를 사용할때에는 각 트래픽에 대한 처리율, 지연시간, 블럭킹 확률특성이 거의 일정하였으나 우선 서비슬르 적용할 경우에는 높은 우선도를 갖는 트래픽의 성능이 처리율, 지연시간, 블럭킹 확률 특성면에서 낮은 우선도를 갖는 트래픽의 성능보다 훨씬 개선되었다. 또한 다양한 광대역 ISDN 트래픽을 서비스 하기 위해서는 서비스 규칙과는 무관하게 단일채널 대역할당 방식보다는 다중채널 대역할당방식을 사용하는 것이 더 바람직함을 알 수 있었다.

• 인터넷정보학회논문지
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• 제11권1호
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• pp.183-193
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• 2010

조직의 성과 향상을 위한 정보시스템 설계, 구성, 실행 노력은 정보기술 활용을 조직 전략과 연계하여 경쟁적 우위를 확보하는 방향으로 이루어져 왔다. 하지만 국내 중소기업의 정보화는 자금, 인력 등의 측면에서 매우 열악한 환경에 머무르고 있다. 중소기업의 열악한 환경을 극복하기 위해 조직 내 정보시스템 수준을 올바르게 평가하고, 정보화 투자가 향후 경쟁력 강화에 기여한다는 이론적 대안을 추구하고 있다. 본 연구에서는 정보시스템 사용 환경에서 SERVQUAL을 정보시스템 부서가 제공하는 서비스에 대한 측정도구로 활용하기 위해, 기존 마케팅 중심의 서비스 범주에서 벗어나 정보시스템 환경에 적용 가능한 모델을 개발하고 그 신뢰도와 타당성을 확인해보았다. 그 결과, 서비스 품질의 향상은 시스템과 정보 품질 등을 향상시킴으로 조직 구성원이 업무환경에 대해 만족하게 되고 결국 순차적으로 정보시스템을 이용하고자 하는 협업성과에 영향을 미치는 것으로 분석되었다.

• 한국콘텐츠학회논문지
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• 제22권1호
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• pp.283-291
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• 2022

COVID-19의 영향으로 공연 영상을 녹화하고 편집하여 유통하는 비대면 환경에서의 언택트(untact) 공연이 활성화되기 시작하였다. 공연장들은 공연을 온라인 플랫폼을 통해 볼 수 있도록 하기 위해서 영상제작 및 중계와 같은 언택트 공연 서비스를 지원하고 있다. 이에 본 연구는 공연장의 언택트 공연 서비스를 이용해본 경험을 가진 전문가들을 대상으로 공연장의 언택트 공연서비스에 대한 만족도와 지속사용의도를 연구하고자 한다. 정보시스템성공모델과 기대불일치모델을 융합하여 공연장의 언택트 공연서비스에 맞는 연구모형을 개발하고 분석한 결과, 총 9개의 가설이 기각되었고 10개의 가설이 채택되었다. 콘텐츠품질을 제외하고, 시스템품질, 서비스품질 모두 기대가 생겨나고 기대와 성과간의 비교를 통한 불일치가 발생하면서 만족도에 영향을 미치고, 만족도가 높을수록 지속사용의도가 높은 것으로 나타났다. 본 연구는 언택트 공연 서비스에 대한 기초 연구로 품질향상을 위한 새로운 관점을 제시해 줄 수 있을 것으로 기대한다.

• 가정과삶의질연구
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• 제27권3호
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• pp.225-237
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• 2009

The purposes of this research were (1) to comprehend how families used and evaluated the in-home care service provided by the Healthy Family Support Center, and (2) to investigate the differences in the perceptions of service fee, satisfaction in and loyalty to service among the types of family categorized by their income. The data from 346 mothers or fathers whose children had received the in-home care service at least once were analyzed. One-way ANOVA and Scheffe or Tamhane post hoc test were used to test the hypotheses. The findings were as follows: 1. There were significant differences in perception of the service fee among the family types: the 'Da'-type families tended to perceive that the service fee was expensive and not cheaper than the similar services provided by other organizations. 2. The 'Ga'-type families scored significantly higher than the 'Na'-type families and the 'Da'-type families on satisfaction in service, and higher than the 'Da'-type families on loyalty to the service. 3. No significant difference was found on satisfaction in the performances of baby-sitters and staffs in charge of the service. The implications drawn from the study findings are discussed.

• 한국조리학회지
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• 제5권2호
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• pp.447-467
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• 1999

Most published work on product quality focuses on manufactured goods. The subject of service quality has received less attention. This distinction is important because some of the quality-improving strategies avaliable to manufacturers may be inappropriate for service firms. Services are performances, not objects. They are often produced in the presence of the customer, as in the cause of hotel restaurant services, quality occurs during service delivery, usually in an interaction between the customer and contact personnel of service firm. for this reason, service quality is highly dependent on the performance of employees, an organizational resource that cannot be controlled to the degree that components of tangible goods can be engineered. The study has begun as a basic study for customer satisfaction-oriented management in understanding the service quality of food & beverage products and through a systematic analysis of it. The major purpose of the study was to examine the relationship of the customer satisfaction and service quality in consideration of reliability, empathy, responsiveness, tangibility and assurance. An empirical research was conducted based on the previous theoretical studies. 286 customer at first class hotels in Seoul were selected as samples of this study. The time period of research was from February through March 1999, and answers were processed by SAS to yield frequency analysis, multivariate statistical analysis and regression analysis. The finding of the statistical treatment are frequencies, factor analysis, multiple regression analysis, path analysis. SERVQUAL method was used the service quality evaluation methods. After factor analysis, it was resulted to 3 factors. those were factor 1(assurance.empathy.responsiveness), factor 2(reliability), factor 3(tangibility). The findings of the statistical treatment are as follows. First, the attribute measurement of performance service quality was affected by customer satisfaction. Second, the attribute measurement of performance service qualify was affected by repurchase intention. Third, The attribute measurement of performance customer satisfaction was affected by repurchase intention. The result of study model was followed, service quality was affected repurchase intention than customer satisfaction. indirected effect through, service duality and customer satisfaction was affected repurchase intention.

• 지식경영연구
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• 제11권1호
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• pp.97-113
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• 2010

Given the large investment and prevalence of knowledge management (KM) in organizations, it has become important to analyze the effects of KM activities on organizational performances. A theoretical framework is proposed to investigate the impact of KM activities on innovation capabilities in the IT service industry. This study considers KM activities as the major determinant that enhances absorptive capacity. KM activities enhance employees'ability to obtain external knowledge, resulting in increasing intellectual capital. Thus, this study proposes that absorptive capacity plays a mediating role between KM activities and innovation capability. Additionally, this study investigates the key antecedents of KM activities that promote employees' knowledge sharing. Based on prior studies on KM, this study posits KM team activities and top manager support as KM activities. The proposed research model was tested by using survey data collected from 556 employees in the IT service industry. PLS (partial least squares) was employed for the analysis of the data. The findings of this study showed that KM activities and absorptive capabilities play a significant role in enhancing service innovation and process innovation in the IT service industry. The results also shed light on the mediating role of absorptive capacity between KM activities and innovation capability. Moreover, both KM team activities and top manager support serve as the salient antecedents of promoting employees' knowledge sharing.