• Journal of KIISE:Information Networking
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• v.35 no.3
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• pp.173-182
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• 2008

Promoting quality of streaming service in wireless networks has attracted intensive research over the years. Instable wireless channel condition causes high transmission delay and packet loss, due to fading and interference. Therefore, they lead to degrade quality of video streaming service. The IEEE 802.11 Working Group is currently working on a new standard called IEEE 802.11e to support quality of service in WLANs. And several schemes were proposed in order to guarantee QoS. However, they are not adaptable to network condition. Accordingly, they suffered video quality degradation, due to buffer overflow or packet loss. In this paper, to promote quality of video streaming service in WLANs, we propose a cross-layer architecture based on IEEE 802.11e EDCA model. Our cross-layer architecture provides differentiated transmission mechanism of IEEE 802.11e EDCA based on priority of MPEG-4 video frames and adaptively controls the transmission rate by dropping video frames through the efficient bandwidth estimation based on distinction of each AC. Through the simulation, proposed scheme is shown to be able to improve end-to-end qualify for video streaming service in WLANs.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2013.10a
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• pp.575-577
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• 2013

The research was aimed at the hotel industry's employees in order to test the efficiency of e-Learning, which is emerging as the alternative training system to the conventional one. The independent variables are the quality of e-Learning, including the qualities of the system, contents, and service of e-Learning, and the learning characteristic factor, including the quality factor of e-Learning, the self-efficacy of the user, learning motivation, and the flow of learning. Furthermore, the intervening variables are its perceived usefulness and the satisfaction factor of the user known as the so-called utility of e-Learning, continuous intention to use in terms of efficaciousness, and the spread of education and training. The dependent variable is customer orientation, known as the ultimate efficaciousness of corporate e-Learning.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.34 no.9B
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• pp.900-907
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• 2009

With the introduction of the concept such as QoS, QoE, and MOS for the multimedia services over the high-speed network the user's concern about the degradation in the perceived quality of service for the conventional data service has become a new problem to the Internet service providers. In this work we propose a method to evaluate the subjective QoE such as MOS for the high-speed Internet service, where the round trip time for the data transfer is taken into account as a performance parameter for the experienced delay. We develop a tool to evaluate an MOS that enables us to investigate the behavior of users for diverse delay times for the web access service, via which we analyze the sensitivity of users with regard to MOS as a function of delay.

• Journal of Digital Convergence
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• v.14 no.3
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• pp.135-141
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• 2016

This paper was conducted to verify the relationship of understanding of learning, service quality, efficiency of convergence e-business valuation. For this paper, it surveyed 179 students and the data were collected Nov. 2~30, 2015. This research analyzed all the samples through ANOVA, t-test utilized by SPSS 22.0 The results as follow. First, understanding of learning, service quality, efficiency had statistically significant difference according to gender. Second, understanding of learning, service quality, efficiency showed statistically significant difference according to grade. The results of this study reveal the fact that the general characteristics like gender and grade made difference to the understanding of learning, service quality, efficiency. Furthermore, this paper may need to include various variables of understanding of learning, service quality, efficiency and suggest research about several university.

• Journal of KIISE:Information Networking
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• v.31 no.5
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• pp.511-518
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• 2004

Web Services following distributed object computing technology like DCOM, CORBA provides remote procedure call mechanism based on XML-based open standard such as SOAP, WSDL, UDDI, and it is spotlighted as means of integration and collaboration at e-business. Especially, UDDI is the Web Services Registry enabling to register and search Web Services, that takes charge of providing infrastructure for Web Services. However, the existing UDDI has a few problems that searching process is very simple and it cannot provide information of Web Services quality and quality-based retrieval. Therefore, this study suggest improved UDDI model that evaluates the Web Services quality and use this information for searching.

• The Journal of the Korea Contents Association
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• v.6 no.8
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• pp.20-29
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• 2006

This paper proposes a quality measurement model for video phone service over IP environment. Proposed model enhances conventional E-Model by using quality analysis and this model is suitable for ubiquitous environment. This research measures video phone quality by applying bust packet loss and recency effect. It uses delay and recency effect for compensating actual quality and recognized quality of user using NR and UR factor. Simulation results show that this model can provide more precise results than conventional model by considering recency effect of video phone service quality measurement model.

• 한국IT서비스학회:학술대회논문집
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• 2007.05a
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• pp.231-236
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• 2007

서비스 경제의 확산과 경쟁심화라는 현 시점에서 서비스품질은 조직의 장기적인 핵심 가치로 판단되는 것이 타당하며, 조직은 서비스품질을 확보하여 재무성과를 향상시켜야 할 것이다. 조직의 성과는 유/무형의 재무적 요소로 표현되나 이러한 재무성과의 성공과 실패는 리더십, 전략, 고객만족, 정보와 지식, 인적자원, 프로세스 등의 유기적인 체계에 의해 좌우된다. 본 연구에서는 한국표준협회 한국서비스대상의 평가지표를 기본 구조로 하여 평가 지표가 실행과제의 내용을 구성할 수 있도록 지표를 세분화 하고 서비스품질의 개선을 통해 경영성과의 증진을 도모하는 일련의 방법론과 프로그램을 개발한다. 연구의 결과는 기업이 전사적 측면에서 서비스품질 활동을 위한 지표개발로부터 실행계획수립까지의 과정에서 필요한 가이드라인 혹은 실질적인 평가 자료로 활용되기를 기대한다.

• The Journal of Information Technology
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• v.2 no.2
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• pp.69-88
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• 1999

Only service organizations providing service quality above customers' anticipations have survived and developed in hyper competitive environment. These organizations are more dependent on their customer-contact service employees than those providing tangible products, because of the characteristics of service, intangibility, inseparability, heterogeneity, and perishability. But few researches focused on the efficient managements or controls of service organizations in this context. Therefore, author aimed at understanding of the determinants of service organizations' control system(i.e., characteristics of service), service employees' reaction on control types(i.e., service employees' role stress), and their performance(perceived service quality by customers). First the concepts of service quality and control systems are described. Specially, author explained the differences between service quality and service satisfaction or service attitude, and the control system types and their fundamental ideologies. Second, some propositions are provided according to integrated framework developed in this paper: (1)control types according to the characteristics of service, (2)influences of control systems on employees' reactions and (3)perceives service quality by the customers, and (4)relationships between the reactions and the service quality. This paper concludes with a summary, a discussion of theoretical and managerial implications, and several suggestions for future directions.

• The KIPS Transactions:PartC
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• v.16C no.6
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• pp.717-724
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• 2009

The most important issue for successful deployment of IPTV service is the service quality. In this paper, we first choose critical quality metrics belonging to each layer of IPTV service transmission architecture and then analyze the relation between the quality parameters. For this purpose, we implement a test network that emulates the most practical environment in which IPTV service is provided and repeat measurements on the test network for the chosen metrics. Based on the analysis result, it is shown that packet losses have greater effect on the video quality of IPTV service comparing to delay and jitter.

• Journal of the Korean Society for information Management
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• v.22 no.1 s.55
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• pp.267-285
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• 2005

As the Internet connections and services at U.S. public libraries have increased dramatically since 1990s, defining, assessing and measuring quality of these new electronic services have become a critical issue. This research was a study designed to identify key dimensions of Internet service quality at public libraries by providing a systematic framework for measuring and assessing the quality of Internet services. The study used modified SERVQUAL and SERVPERF instruments which have been widely used service quality measurement in business marketing areas and LibQUAL+ model which are widely adopted service quality measurement instrument in most of the academic libraries in U.S.