• Asia-pacific Journal of Multimedia Services Convergent with Art, Humanities, and Sociology
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• v.7 no.1
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• pp.35-44
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• 2017

In this paper, we attempt to investigate the moderating effect of brand power on the effect of in-flight service quality on customer satisfaction and recommendation in the aviation industry. The results were as follows. First, in the case of high brand power FSC(full service carriers), the cost-to-benefit ratio as well as all other flight service properties influence to customer satisfaction. However, in the case of low brand power FSC, the cost-to-benefit ratio showed a greater impact of customer satisfaction compared to other in-flight services. Second, as in the case of customer satisfaction, while the cost-to-benefit ratio more influence to customer recommendation than other in-flight services in low brand power FSC, the cost-to-benefit ratio as well as all other flight service properties influence to customer recommendation together in high brand power FSC. Therefore, low brand power FSC required tit-for-tat strategy against to LCC(low cost carriers) by pursuing disruptive innovation for price. And high brand power FSC required sustaining innovation strategy through improving flight services.

• Water for future
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• v.50 no.11
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• pp.75-80
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• 2017

• Proceedings of the Korean DIstribution Association Conference
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• 2003.11a
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• pp.151-172
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• 2003

• Proceedings of the Korean Society for Quality Management Conference
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• 2009.10a
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• pp.377-386
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• 2009

• Journal of the Korea Institute of Information and Communication Engineering
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• v.17 no.7
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• pp.1609-1617
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• 2013

TFRC(TCP-Friendly Rate Control) has a performance degradation in wireless networks because it performs congestion control by judging all the losses occurred in wireless networks as a congestion indicator. It is also degraded by the increased Round Trip Time(RTT) due to packet retransmission and contention overhead in the link layer. In this paper, we propose an adaptive rate control scheme based on cross-layer to improve the quality of streaming services in the wireless networks. It provides new RTT estimation and loss discrimination methods to improve transmission rate of TFRC. The simulation results show that the proposed scheme can improve the performance of TFRC.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2018.06a
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• pp.340-342
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• 2018

최근 네트워크 기술과 스마트 단말의 보급으로 인해 비디오 스트리밍 서비스에 대한 수요가 증가하게 되었다. 네트워크를 효율적으로 사용하여 비디오 스트리밍 서비스를 제공하기 위해 적응적으로 전송률을 조절하는 HTTP (HyperText Transfer Protocol) 적응적 스트리밍 서비스가 주목 받게 되었다. UHD (Ultra High Definition) 콘텐츠는 HD (High Definition) 콘텐츠에 비해 적어도 4 배 이상의 크기를 갖기 때문에 끊김 없는 UHD 콘텐츠 스트리밍 서비스를 제공하기 위해서는 많은 가용 대역폭이 필요하다. 기존의 HTTP 적응적 스트리밍 방식은 정상 상태 (Steady State)에서 가용 대역폭보다 낮은 품질의 비디오 세그먼트를 일정 시간마다 주기적으로 요청하여 다운로드 받는다. 정상 상태에서는 가용 대역폭과 콘텐츠의 인코딩 율에 차이에 따라 On-Off 구간의 패턴이 반복되어 발생하고, 빈번한 Off 구간에 의해서 대역폭이 낭비되는 문제점이 있다. 따라서 본 논문에서는 HTTP 적응적 스트리밍에서 UHD 콘텐츠의 효율적인 대역폭 활용을 위한 세그먼트 전송 기법을 제안한다. 제안하는 기법은 Off 구간의 빈도수를 줄이기 위한 집단 세그먼트 전송 방식과 대역폭 낭비를 최소화 하기 위한 세그먼트 품질 조절기법으로 구성되어 있다.

• Proceedings of the Korean Information Science Society Conference
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• 2007.06c
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• pp.341-346
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• 2007

본 논문에서는 유비쿼터스 컴퓨팅 시스템이 사용자에게 적절한 서비스를 제공하도록 도와주는 지능형 서비스 에이전트를 제안한다. 사용자에게 적절한 유비쿼터스 서비스를 제공하기 위해서는, 각각의 유비쿼터스 서비스 시스템 내에서의 상황 정보(Context Information) 차이를 조절하고 사용자의 취향을 서비스에 반영해야 한다. 따라서 다음 3가지 부분에 중점을 두어 연구를 진행하였다. 첫째, 적절한 다중 에이전트 프레임워크 - 에이전트간의 커뮤니케이션 이해와 추론엔진의 적용, 둘 째, 유비쿼터스 컴퓨팅 환경 내에 존재하는 다양한 상황 정보 (Context information)를 효과적으로 표현하는 유비쿼터스 온톨로지 - 에이전트간의 상황 정보 공유와 이해, 마지막으로 유비쿼터스 시스템에 적용되는 사용자 프로파일 구축 방법에 대해 연구 하였다. 본 논문에서 제안하는 지능형 서비스 에이전트는 사용자 취향에 따라 적절한 서비스를 제공하는 적응형 유비쿼터스 서비스 시스템 구축을 가능하게 한다.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.9 no.5
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• pp.1428-1445
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• 2008

This study focuses on examination a) of impacts of entrepreneurs' psychological characteristics on business performance (need fur achievement and risk-taking propensity), b) of impacts of entrepreneur's competency characteristics(vision, opportunity recognition, social deftness, frequency of networking and reliability) on business performance, and c) of controlling impacts of business incubator on the relationship between entrepreneurs' characteristics (psychological characteristics and competency) and business performance. According to a study, among entrepreneurs' psychological characteristics, need for achievement has a significant impact on business performance, whereas risk-taking propensity is found to have no significant impact on business performance. In addition, among entrepreneurs' competency characteristics, vision, social deftness, and network reliability have no impact on business performance, whereas opportunity recognition and frequency of network have an impact on business performance. On the other hand, need for achievement has a negative impact on controlling business incubator services. Business incubator services have a significant impact on the relationship between vision, network reliability and business performance.

• Journal of Broadcast Engineering
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• v.14 no.1
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• pp.44-58
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• 2009

To provide efficient video streaming service over a wireless networks, the rate adaptation scheme should be applied at the low layer and the quality adaptation scheme should be considered at the high layer. In this paper, we propose a new cross-layer design which includes rate adaptation scheme at the MAC/PHY layers and quality control at the application layer. Proposed rate adaptation scheme improves the wireless channel utilization by transmitting the consecutive frames and selects optimal transmission mode by calculating the goodputs for each transmission mode. Based on selected transmission mode, the rate adaptation scheme calculates the rate limits and informs that to the application layer. Then the video streaming application utilizes this rate limits to adjust the quality of the video stream. Through performance evaluations, we prove that our cross-layer design improves the quality of the wireless video streaming service by means of the proposed rate adaptation scheme.

• Journal of Digital Convergence
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• v.20 no.5
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• pp.477-488
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• 2022

The purpose of this study is to examine how factors that select Airbnb service affect service satisfaction and the moderating effect according to marital status. The subjects of this study are customers who who have used Airbnb services in the metropolitan area. The questionnaire survey was conducted with 150 people, and the results were analyzed and hypothesis testing was performed using Structural Equation Model(SEM). As a result of the study, it has been found that price, online review, and Unique Experience Expectation(UEE) among the factors that selected Airbnb have positive effects on service use satisfaction. In addition, marital status has been found to play a mediating role among price, UEE and customer satisfaction. For single customers, price is an important factor influencing service satisfaction, but for married customers, it is not. In this sense, it is important not only to conduct marketing and promotions considering only gender, but also to provide services according to whether they are single or married.