• KSII Transactions on Internet and Information Systems (TIIS)
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• v.8 no.1
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• pp.91-107
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• 2014

Device-to-device (D2D) communication is an excellent technology to improve the system capacity by sharing the spectrum resources of cellular networks. Multicast service is considered as an effective transmission mode for the future mobile social contact services. Therefore, multicast based on D2D technology can exactly improve the spectrum resource efficiency. How to apply D2D technology to support multicast service is a new issue. In this paper, a resource allocation scheme based on cognitive radio (CR) for D2D underlay multicast communication (CR-DUM) is proposed to improve system performance. In the cognitive cellular system, the D2D users as secondary users employing multicast service form a group and reuse the cellular resources to accomplish a multicast transmission. The proposed scheme includes two steps. First, a channel allocation rule aiming to reduce the interference from cellular networks to receivers in D2D multicast group is proposed. Next, to maximize the total system throughput under the condition of interference and noise impairment, we formulate an optimal transmission power allocation jointly for the cellular and D2D multicast communications. Based on the channel allocation, optimal power solution is in a closed form and achieved by searching from a finite set and the interference between cellular and D2D multicast communication is coordinated. The simulation results show that the proposed method can not only ensure the quality of services (QoS), but also improve the system throughput.

• Journal of Korean Society of Industrial and Systems Engineering
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• v.40 no.2
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• pp.41-50
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• 2017

The purpose of this paper is to improve the service tree analysis introduced recently by Geum et al. [15]. Service tree analysis structures the service based on the customer participation perspective and provides a qualitative analysis method categorizing the service elements on the basis of its impact to top service. This paper attempts to apply the concept of reliability importance to the service tree analysis as a perspective of quantitative analysis, which is considered little in Geum et al. [15]. Reliability importance is a measure of the structural impact of the components that make up the system on the system lifetime in reliability engineering field and often used in fault tree analysis. We transform the reliability importance into service importance in accordance with service tree analysis, so that the influence of service elements on the service can be judged and compared. The service importance is defined as the amount of change of the service according to the change of the service element, therefore, it can be utilized as an index for determining a service element for service improvement. In addition, as an index for paired service elements, the relationship between the two service components can be measured by joint service importance. This paper introduces conceptual changes in the process of applying reliability importance to service analysis, and shows how to use the service importance for identifying the priority of service element for the final service and improving customer satisfaction through an example. By using the service importance and joint service importance in service tree analysis, it is possible to make efficient decision making in the process of determining the service elements for analyzing and improving the service.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.7 no.1
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• pp.1-8
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• 2003

Information searched in UDDI transfer web service user. Then web service user require interface to web service publisher. In this paper, we abbreviate procedure it. UDDI require WSDL document to web service publisher. For this reason, UDDI transfer XML form message to publisher. Message include user's location information and UDDI required document transfer from publisher to user. Message using SOAP protocol of XML format.

• Journal of Information Technology Applications and Management
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• v.11 no.2
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• pp.65-80
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• 2004

The primary purpose of this study is to investigate ASP (Application Service Provider) vendor attributes that affect ASP client satisfaction. From the relevant literature, ASP vendor attributes that might affect the ASP client satisfaction were derived from which the survey questions were formulated. The survey was conducted among the companies that have adopted ASP. Through the factor analysis of the survey results, the following vendor attributes - vendor's IT infra structure, service reliability, service flexibility, vendor stability, IS maturity, information sharing - were derived ; and the relationships between those attributes and ASP client satisfaction were explored. The result of this study revealed that IT infra, service flexibility, vendor stability are related to ASP client satisfaction. The customer satisfaction factors in the traditional outsourcing -- reliability, IS maturity, information sharing were proved to be not applied in ASP environment. This study provides ASP vendors with guidelines on how to improve their ASP strategies to satisfy clients. The results of this study can also be used by client companies as a decision basis for ASP vendor selection.

• Proceedings of the Korean Society for Quality Management Conference
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• 2007.04a
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• pp.64-69
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• 2007

In this study, it is going to improve basic thought continuously about railroad industry service quality. So, it studies connection between main factor about service quality and customer satisfaction for KTX railroad industry also general railroad service quality problems. To make clear, first of all, it could understand element structure through hunting factor analysis, and then, it has statistical test in conclusive factor analysis. Finally, it would be show successful service quality direction that is result of analyzing between all ingredients of KORAIL industry service quality and causality of customer satisfaction to apply ideal point.

• Proceedings of the KSRS Conference
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• 2005.10a
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• pp.567-570
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• 2005

Recently, as mobile paradigms such as telematics or LBS (Location Based Service) have been being more diverse and mobile devices such as PDA (Personal Digital Assistance) or several telematics terminals have been being used more widely, mobile services, for example, mobile geographic information service have been being put more importance by people. In this paper, we propose to adopt S/W and data streaming mechanism as a method to improve performance of mobile geographic information service which is a representative of mobile services based on client-server architecture. The show the effectiveness of proposed methods, we design and implement S/W streaming prototype system and sample mobile geographic information service to be executed on the S/W streaming system.

• Journal of Korean Society for Quality Management
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• v.24 no.4
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• pp.141-155
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• 1996

In service industries, it is very hard to transform the quantified factor into qualified one. Nowadays, however, service industries employee various methods developed by the academic society to manage effectively. Therefore, we have focused our research on QFD that is applied to improve the flow of execution in customer complains in Air Lines which can be considered as the representation of Service Industries. QFD is a method of developing new service with response to the demand from customer thanks to the application of QFD. In this paper we decide the priority of the department for executing the customer service of Air Lines. After setting up the relations among departments, we analyze the problems caused by the contact between customers and departments.

• Journal of the Korean Society of Physical Medicine
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• v.5 no.3
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• pp.421-434
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• 2010

Purpose : The purpose of this study is to understand the attitudes to internal service quality between coworkers, service quality to patients, job satisfaction, organizational identification and job identification of physical therapists in medical organizations. Methods : Data were collected from physical therapists working in medical organizations. 195 questionnaires were analyzed. Participants' total mean, group mean by age, sex, career and type of medical organization and the variables' correlations were examined. Results : The attitudes of physical therapists to five variables were very positive. Especially job identification was strong. The significant differences between groups were found in some variables. All variables except age and career were positively related to each other. The correlation between age and career was very high. Age and career were related to some of variables. Conclusion : To improve organizational performances it should be a top priority to understand the attitudes of physical therapists in organizations.

• Journal of the Korean Society for Aviation and Aeronautics
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• v.26 no.2
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• pp.116-122
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• 2018

Due to the opening of Incheon International Airport Terminal 2, the operation range of ground operators is expanding and the workload is increased, which may cause a deterioration of the operation quality. Airline and airport corporations are concerned about safety delays as well as delays in flight due to delays in operations. Air traffic demand at Incheon International Airport is expected to increase steadily in the future. Therefore, this study intends to derive quality improvement plan by investigating the perception of stakeholders about the status of fishing service in order to improve service quality of Incheon airport ground handling company. The results of the analysis are expected to be used as basic data for improving quality of service.

• Korean Management Science Review
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• v.31 no.4
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• pp.107-116
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• 2014

Recently, various types of information and communication technology (ICT) such as cloud computing, big data, and virtual reality have been progressed in the world. Also, it is expected that there are many domestic and foreign visitors in Gangwon-do due to the Pyeongchang winter olympic games in 2018. In this environment, it is necessary to improve the competitiveness of Gangwon-do in winter sports areas exploiting both existing IT infrastructure and application technologies. In this paper, for sustainable development of Gangwon-do winter sports IT industry after the Olympics, we propose efficient implementation methods of 3 winter sports IT convergence services and Gangwon-do ICT activation strategy. The proposed 3 winter sports IT service areas are as follows. 1) Realistic winter sports IT service, 2) Winter sports medical IT service 3) Winter sports record analysis IT service.