• The Journal of Korean Institute of Communications and Information Sciences
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• v.40 no.6
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• pp.1032-1039
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• 2015

Service function chaining(SFC) defines the creation of network services that consist of an ordered set of service function. A multiple service function instances should be deployed across networks for scalable and fault-tolerant SFC services. Therefore, an incoming flows should be distributed to multiple service function instances appropriately. In this paper, we formulate the flow distribution problem in SFC aiming at minimizing the end-to-end flow latency under resource constraints. Then, we evaluate its optimal solution in a realistic network topology generated by the GT-ITM topology generator. Simulation results reveal that the optimal solution can reduce the total flow latency significantly.

• Journal of The Korean Association of Information Education
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• v.14 no.4
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• pp.489-496
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• 2010

Since the specifications of public services in broadcasting-telecommunication convergence environment are not standardized, the public services should be developed and presented by each IPTV service provider, and therefore it is worried that public organizations and IPTV service providers may invest in the public services redundantly, which are managed inefficiently. To resolve those problem, in this paper, the service and network interfaces among multiple public organizations and multiple IPTV service providers and the interactive VOD-type public service providing system of one source multi-use based on ACAP-J are proposed. The proposed system can be utilized in the standard platform of the evolved new public services. And the used technologies can be utilized as a guide for the development of new services.

• Journal of the Korea Convergence Society
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• v.8 no.7
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• pp.29-37
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• 2017

Compared to the commercial networks, R&E networks have the strength such as flexible network engineering and design. Based on those features of R&E networks, we propose our storage cloud service model which supports general-purpose network users in a central region and experimental network users in distributed regions simultaneously. We prototype our service model utilizing multiple proxy controllers of OpenStack Swift service in order to deploy several regions via experimental backbone networks. Our experiments on the influence of the network latency and the size of data to be transmitted show that the bigger size of data is preferable to the smaller size of data in an experimental backbone network where the network latency increases within 10ms because the rate of throughput decline in the bigger object is comparatively small. It means that our service model is appropriate for experimental network users who directly access the service in order to move intermittently high volume of data as well as normal users in the central region who access the service frequently.

• The KIPS Transactions:PartC
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• v.16C no.2
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• pp.223-228
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• 2009

Efficient service discovery mechanism is a crucial feature for a hybrid ad-hoc network supporting extension of a wireless ad-hoc network to the Internet. We propose an efficient cross-layer service discovery mechanism using non-disjoint multi-path source routing protocol for hybrid ad-hoc networks. Our scheme has advantages of multi-path routing protocol and cross-layer service discovery. Intuitively, it is not difficult to imagine that the cross-layer service discovery mechanism could result in a decreased number of messages compared to the traditional approach for handling routing independently from service discovery. By simulation, we show that faster route recovery is possible by maintaining multiple routing paths in each node, and the route maintenance overhead can be reduced by limiting the number of multiple routing paths and by maintaining link/node non-disjoint multi-path.

• Journal of the Korean Society for Library and Information Science
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• v.57 no.1
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• pp.69-92
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• 2023

The purpose of the present study is to investigate the quality attributes of archival information service affecting user satisfaction. The independent variables in this study were equality, tangibles(appearance), convenience, responsiveness, empathy. And the dependent variable was a user satisfaction. The survey was conducted by online and offline for 78 people that used the archival information service. To solve the research question, we used the descriptive statistics, correlation analysis, multiple regression analysis. As a correlation analysis result, the quality attributes of archival information service had positive correlation with a user satisfaction. And as a multiple regression analysis result, tangibles(appearance) had a significant effect, followed by empathy and convenience. For improving on quality of archival information service, it is required that improving facilities, keeping environment clean, enhancing empathy ability, updating the information of archive, reforming search tools.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.24 no.6A
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• pp.791-802
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• 1999

This paper introduces a wireless multimedia CDMA system using a simulcasting method and configuring multiple radio links between a user and radio ports. The CDMA system with multiple links can support seamless and soft handoffs as well as port-diversity effect. We propose two transmission power control algorithms for the multiple links which support the required service quality. We perform simulations for the capacity of the proposed system. In the simulations, a system with nine ports is configured and simulated. For the uplink, as the number of the multiple links increases, the capacity also increases and immediately approaches to the theoretical upper limit. It is shown that four radio links are enough to achieve the theoretical maximum capacity. On the other hand, for the downlink, though it has the merit of soft and seamless handoff in the wireless ATM system, the capacity rather decreases as the increase of the number of the links due to the severe multiple interferences.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.33 no.1A
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• pp.59-66
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• 2008

This paper presents a spectrum sharing and allocation problem in multiple network operators(NOs). Most of previous works as to dynamic spectrum allocation(DSA) schemes have presented the DSA gain achieved by utilizing the time or regional variations in traffic demand between multi-network operators(NOs). In this paper, we introduce the functionalities required for the entities related with the spectrum sharing and allocation and propose a spectrum allocation algorithm while considering the long-term priority(or fairness) between NOs, the prioritybetween multiple class services, and the urgent bandwidth request. It was shown that the proposed algorithm with priorities between multiple class services could sustain better satisfaction ratio(SR) than the fixed allocation schemes or one without priority under different traffic patterns. Therefore, we conclude that the proposed DSA with priorities between multiple class services and network operators could provide the fairness between service classes of network operators and effective negotiation procedure for urgent bandwidth request by users.

• Korean Journal of Human Ecology
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• v.6 no.1
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• pp.67-80
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• 2003

The purpose of this study was to identify influence of perceived service quality on shopping value and shopping satisfaction. The subjects of this study were 550 adults women living in Gwang-ju. The data were collected using questionnaire from October 23 to October 27, 2001 and answers were analyzed using descriptive statistics, factor analysis, correlation analysis, multiple regression analysis. The results were as follows : 1. The effect of perceived service quality on shopping value. the perceived service quality influenced the shopping value positively. 2. The effect of shopping value on shopping satisfaction, in particular, hedonic shopping value had high positive effect on shopping satisfaction. 3. The effect of perceived service quality on shopping satisfaction, the perceived service quality influenced the shopping satisfaction positively.

• Journal of Korea Society of Digital Industry and Information Management
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• v.5 no.2
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• pp.185-197
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• 2009

The Purpose of this study was to investigate of university students' perceived Service Qualities on the internet fashion and apparel shopping malls. This survey was carried out with real customers. Data were obtained from 197 internet fashion shopping mall consumer(university students) who have bought fashion products. Questionnaires related to service quality, perceived service value and loyalty. This study was investigated with focused on customer of university students itself. To find relationships among variables, exploratory factor analysis and multiple regression was carried out with collected data. The resulted were as follows: 1. The service quality dimension of fashion internet shopping malls were external quality of web, reliability quality and emotional quality. 2. The all of service quality dimensions of internet fashion and apparel shopping malls had an effect on university students perceived value and loyalty.

• Journal of the Korea Safety Management & Science
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• v.17 no.1
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• pp.231-240
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• 2015

This paper reviewed the relationship between job burnout and service quality, and the moderating effect of self-efficacy. Based on the responses from 232 employees, the results of multiple regression analysis appeared as follow; 1) emotional exhaustion and depersonalization effected negatively on all service quality factors(empathy, reliability, responsiveness). 2) the reduced personal accomplishment effected negatively on two service quality factors(reliability, responsiveness). 3) self-efficacy effected positively on the relationship between emotional exhaustion and service quality. 4) self-efficacy effected positively on the relationship between he reduced personal accomplishment and service quality.