• 디지털융복합연구
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• 제10권6호
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• pp.197-203
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• 2012

본 논문에서는 IPTV 멀티캐스팅 서비스에서 네트워크 부하증가에 따른 영상품질을 평가하기 위해 유럽형 디지털 영상품질 표준 측정규격인 ETSI(European Telecommunication Standard Institute) TR 101 290을 이용하여 실험 측정한 결과를 제출하였다. 실험결과를 통해 IPTV에서의 영상품질과 ETSI TR 101 290 측정방식과는 밀접한 상관관계가 있음을 증명하였고 기존의 영상품질 평가방식에서 알 수 없었던 요소를 정확하게 평가할 수 있음을 증명하였다.

• 한국콘텐츠학회논문지
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• 제9권3호
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• pp.81-90
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• 2009

서비스지향구조 소프트웨어 품질평가는 품질 향상을 유도할 수 있는 기술로서 국제 표준을 수용하는 전략기술 개발을 통해 객관성과 활용도를 높일 수 있고 많은 소프트웨어 기업들이 비즈니스 요구사항과 연계된 솔루션을 구현하기 위한 방법으로 서비스지향구조 기법을 사용하고 있다. 또한, 정부차원의 시범사업이 추진되고 있으며 관련 업계의 기술 개발에 따라 서비스지향구조 기반 소프트웨어의 상용화가 확산되고 있다. 따라서, 본 연구에서는 서비스지향구조 기반 소프트웨어의 유지보수성 품질을 평가하기 위해 시험 메트릭을 제안하였고 품질을 측정하고 그 결과를 적절한 기준에 따라 판정하는 방법에 대해 연구를 수행하고 평가 사례를 제시하여 평가 방법을 명확히 제안하였다. 본 연구를 통해 서비스지향구조 기반 소프트웨어의 유지보수성 품질향상을 유도하고 서비스지향구조 기반 소프트웨어에 대한 양적/질적인 수요를 충족할 수 있다고 본다.

• 대한가정학회지
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• 제44권5호
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• pp.79-87
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• 2006

The purpose of this study is to analyze whether service quality and perceived risk have an effect on purchase intention and satisfaction of the fashion merchandise in internet shopping malls. To this end, a survey was conducted from June 20 to July 30 in 2005, among married women aged in their 20s and 30s, on their purchase experience of fashion merchandise from internet shopping malls. The survey was conducted over the internet with 306 subjects. The statistical analysis methods were frequency analysis, reliability analysis, factor analysis, and multiple regression analysis. First, the service quality factors were determined to be reliability, responsibility, ease of transaction, order convenience, and site characteristics. Perceived risk factors were determined to be merchandise risk, information exposure risk, social psychological risk, and function risk. Second, service quality factors of responsibility, ease of transaction, order convenience, site characteristics and perceived risk factor of social psychological risk had an effect on internet purchase intention of the fashion merchandise. Greater site use convenience, lower price, simpler ordering, and lower social psychological risk were all positively correlated with higher internet purchase intention of fashion merchandise. Third, nice quality factors and social psychological risk had an effect on satisfaction degree in internet shopping.

• 대한안전경영과학회지
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• 제3권1호
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• pp.67-79
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• 2001

This study is based on Parasuraman, Zeithaml 8l Berry［19］`s SERVQUAL measure that develop for estimation of service quality, so this study proposes the present condition of customer service and improvement method on internet search engine. This study also develops a questionnaire for analyzing customer satisfaction considering the present condition of internet service. We're going to analyze the customer service quality that classified by search engines, service quality with university students who use usually internet.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제7권4호
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• pp.784-799
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• 2013

This paper presents an adaptive rate control scheme for streaming-based content sharing service. This scheme delivers multimedia contents from a user device to another device or seamlessly redirects streaming service across heterogeneous user devices. In the proposed scheme, a streaming server adjusts video quality level according to the network and client status. Our scheme is different from other rate control schemes, because the video quality at the server is decided not only based on the available bandwidth, but also based on the device characteristics and bandwidth requirement at the access network. We also propose a bandwidth estimation method to achieve more equitable bandwidth allocations among streaming flows competing for the same narrow link with different Round Trip Times (RTTs). Through the simulation, we prove that our scheme improves the network stability and the quality of streaming service by appropriately adjusting the quality of the video stream. The simulation results also demonstrate the ability of the proposed scheme in ensuring RTT-fairness while remaining throughput efficient.

• Journal of Communications and Networks
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• 제12권6호
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• pp.624-631
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• 2010

Effective traffic matrix estimation is the basis of efficient traffic engineering, and therefore, quality of service provision support in IP networks. In this study, traffic matrix estimation is investigated in IP networks and an Elman neural network-based traffic matrix inference (ENNTMI) method is proposed. In ENNTMI, the conventional Elman neural network is modified to capture the spatio-temporal correlations and the time-varying property, and certain side information is introduced to help estimate traffic matrix in a network accurately. The regular parameter is further introduced into the optimal equation. Thus, the highly ill-posed nature of traffic matrix estimation is overcome effectively and efficiently.

• 한국컴퓨터정보학회논문지
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• 제13권5호
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• pp.315-321
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• 2008

본 연구는 호텔기업의 서비스 품질 평가에 있어 고객의 질, 물리적 품질, 서비스제공자 품질이 호텔품질에 미치는 영향과 상관관계를 분석하여 그 효과를 검증하기 위한 것이었다. 연구결과 호텔품질에 미치는 영향은 서비스 제공자 품질>물리적 품질>고객의 질[매너]>고객의 질[외양] 요인 순으로 호텔품질을 가장 유의하게 설명하고 있는 것으로 분석되었다. 또한 각 변수간의 상관관계는 고객의 질(매너)과 물리적 품질 요인이 가장 높게 나타났는데 이것은 고객의 질이 호텔서비스 품질 구성차원 변수로서 중요한 영향을 미치는 변수임을 발견할 수 있는 결과이다.

• 상하수도학회지
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• 제20권3호
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• pp.411-429
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• 2006

To improve Service quality for water and wastewater works, most water and wastewater utility effort to develop not only facility construction but also operation optimization. The operation is optimized by accurate estimation for ongoing situation. And from the accurate estimation, utility operator gain a information about their service quality and problems, So we developed a evaluation tool (Performance Indicators: PI) for service activity of water and wastewater works. The PI was developed in many countries and some international organizations (World Bank, IWA etc.) for service benchmarking. And ISO (international organization for standardization) just has been making a service standard for water and wastewater system (So called ISO/C224). This proceeding for making a service standard is ongoing now and will be launched in 2007. In our study, PI was composed of 6 parts (A human resource, facility management, operation, service quality, finance and environment). To evaluate water utilities, performance indicators for water was consisted of 100 items. Each 2 water utilities were estimated by this performance indicator. From the study, we just know that the performance indicator was a very useful tool to estimate utility service quality. And from the result, it is possible to know the strong and weak point of estimated utilities.

• 전기학회논문지P
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• 제61권2호
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• pp.103-109
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• 2012

This paper analyzed major factors affecting video quality in IPTV (Internet Protocol TV) services in multicasting under our lab network environment similar to practical IPTV service networks. We measured video qualities for the broadcasting traffics in IPTV multicasting with or without applying QoS (Quality of Service) technique. The measurements allowed us to extract thresholds of network measurement factors affecting the quality for the service. It will be a good choice that the factors can be a reference to ensure stable video quality for practical IPTV services in multicasting.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제6권4호
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• pp.1006-1025
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• 2012

Improving the quality of service in IP networks is a major challenge for real-time voice communications. In particular, packet arrival-delay variation, so-called "jitter," is one of the main factors that degrade the quality of voice in mobile devices with the voice-over Internet protocol (VoIP). To resolve this issue, a receiver-based enhanced timing recovery algorithm combined with active jitter estimation is proposed. The proposed algorithm copes with the effect of transmission jitter by expanding or compressing each packet according to the predicted network delay and variations. Additionally, the active network jitter estimation incorporates rapid detection of delay spikes and reacts to changes in network conditions. Extensive simulations have shown that the proposed algorithm delivers high voice quality by pursuing an optimal trade-off between average buffering delay and packet loss rate.