• The Journal of Korean Institute of Communications and Information Sciences
• /
• v.27 no.7A
• /
• pp.711-723
• /
• 2002

A finer granular scalable (FGS) version of ISO/IEC MPEG-4 video streaming is investigated in this work with the prioritized stream delivery over loss-rate differentiated networks. Our proposed system is focused on the seamless integration of rate adaptation, prioritized packetization, and simplified differentiation for the MPEG-4 FGS video streaming. The proposed system consists of three key components: 1) rate adaptation with scalable source encoding, 2) content-aware prioritized packetization, and 3) loss-based differential forwarding. More specifically, a constant-quality rate adaptation is first achieved by optimally truncating the over-coded FGS stream based on the embedding rate-distortion (R-D) information (obtained from a piecewise linear R-D model). The rate-controlled video stream is then packetized and prioritized according to the loss impact of each packet. Prioritized packets are transmitted over the underlying network, where packets are subject to differentiated dropping and forwarding. By focusing on the end-to-end quality, we establish an effective working conditions for the proposed video streaming and the superior performance is verified by simulated MPEG-4 FGS video streaming.

• ETRI Journal
• /
• v.15 no.2
• /
• pp.53-68
• /
• 1993

The field of marketing research in the satellite communication services is still in the early stage of its development. Particularly, in Korean domestic satellite service market, many theoretical and methodological opportunities now exist. In this paper we develop a model, which identifies target markets and promising application services in Korean satellite communication service Market. One key contribution of this paper is a modeling approach to the assessment of market potential and priorities of the application services in each Korean industry. We define and estimate the degree of attractiveness for each segmented market which represents the market potential estimated by current usage of terrestrial services and each market segment's willingness to adopt satellite technology. Since all possible satellite application services are not equally important in the market, they should be differentiated in terms of the likelihood of success. We introduce another index prioritizing application services by tying together three important factors affecting Korean satellite service demand. Some marketing implications of model results are also discussed. Finally the findings of our model are compared with those of other similar studies.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
• /
• 1998.11a
• /
• pp.370-373
• /
• 1998

현재 인터넷상의 QoS(Quality of Service) 향상을 위해서 여러 가지 방법과 기술들이 소개되고 있다. 이러한 QoS 향상을 위해 트래픽 제어기법과 IS(Integrated Services), DS(Differentiated Services), Tag Switching, MPLS(Multi protocol Label Switching) 등과 같은 방법으로 인터넷에서 보다 나은 서비스를 지원하려는 노력이 시도되고 있다. 본 논문에서는 특히 TCP connection에서의 initial window size의 변경이 네트워크의 QoS, 즉 link의 utilization과 packet의 drop, performance에 어떠한 영향을 주는지를 살펴본다. 그리고, 이에 대한 특성을 분석하고 개선점을 현재의 인터넷에서 가장 많이 사용되어지고 있는 FTP와 web에 대한 모델을 사용하여 가상적으로 시뮬레이션을 해본다.

• Asia pacific journal of information systems
• /
• v.7 no.3
• /
• pp.109-124
• /
• 1997

Pricing information services, where congestion can threaten the efficient operation of information systems, has been studied in economics and information systems literature, Recent explosion of the Internet ana proliferation of multimedia content over the Internet have rekindled the research interest in designing pricing schedules for differentiated information services, In order for the information system to effectively serve users having heterogeneous needs, pricing rules for discriminated services should be considered. At the same time, when individual users' interest does not align with that of the organization that individual users belong to, organization-wide pricing policy should be devised to improve the value of the services rendered by the system. This paper, using a priority queuing model, addresses the need for such on incentive-compatible pricing for different information services.

• Journal of The Institute of Information and Telecommunication Facilities Engineering
• /
• v.3 no.1
• /
• pp.75-87
• /
• 2004

The mobile industry is waking up to the reality that customers buy 'services', not technology. Thekey is to deliver a variety of differentiated services today and improve them as the advanced technology becomes available. In the increasingly data centric world of the future, the emphasis will be on the provision of a range of services audio, video, data and multimedia and of course speech. As we move closer to the realization of these mobile services in the conglomeration of converged networks, new challenges are being faced by the technology and application developers as well as the service providers to design, test and integrate new products and services. Functionalities like availability, scalability, performance and compatibility have become more important. This paper discusses the new test paradigms in the mobile networks, both from the applications and the protocols perspective.

• Journal of Korean Library and Information Science Society
• /
• v.30 no.1
• /
• pp.171-192
• /
• 1999

Unlike the past, university libraries are able to provide specialized and differentiated information services due to the advent of information technology and telecommunication. Such services are essential not only to the primary users, such as professors and students in the universities, but also to the external users including corporations, researchers, and the general public. Now, university libraries as a means of resource sharing with communities should develop the services to play a role as a research and information center and expand such services to outside users who need the information services. Accordingly financial support is a necessity to provide the services, thereby fee-based information services are one of the devices for solving the financial burden and controlling outside users. This paper tries to present a program for fee-based information services which are able to be implemented by university libraries. Also the papers deals with the present conditions of fee-based information services provided by university libraries briefly and the goals of the program; coverage of subjects and types of materials for the program; organizations and staff; types of fee-based information services; management methods of program.

• Journal of Fashion Business
• /
• v.7 no.1
• /
• pp.38-54
• /
• 2003

This study looked into the present status of e-mail marketing, which is conducted in local Internet fashion shopping malls and is being used as a one-to-one marketing method in the e-CRM concept so as to establish an effective e-mail marketing policy by grasping problems based on the current status and by presenting solutions to the problems. This study analyzed the e-mail letters received during a certain period of time by 30 professional Internet fashion shopping malls of with famous goods, brands and non-brands. Four individuals subscribed to shopping mall through the procedure for membership applying for e-mail services. The analysis showed that there were no shopping malls that were doing a differentiated e-mail marketing among Internet shopping malls. As for time factor, they were sending e-mail letters irregularly regardless of a certain cycle. And as for visual factor, they didnt have any standard for the content of the mail. As for content factor, the contents of their mail were not differentiated and all the same. The comparison of fashion malls showed that the brand shopping malls were the most active in e-mail marketing. On the basis of the problems, the direction for the effective e-mail marketing of Internet shopping malls are presented as follows: First, individualized contents fitting for customers should be developed, and differentiated mailing services should be provided thereby. Second, each shopping mall should make periodic tests of mailing to find out the optimal time and day to provide e-mail services to the customers at the designated time. Third, e-mail should be differentiated fitting for the website according to a certain on a certain standard for visual effects and the identity of shopping mall should be established. Firth, in the contents of e-mail, the image and message elements should be properly harmonized and creative policies should be made with interactive or recreational elements. Fifth, a homepage policy which can satisfy customers demand for information when the e-mail is clicked on..

• 한국노년학
• /
• v.29 no.3
• /
• pp.1043-1061
• /
• 2009

The purpose of this study is to evaluate cost side by type of long term care services economically, and then to discuss the findings and implications for the results of analysis. For this research, primary caregivers that provide care the elderly requiring long term care services sanctioned by National Health Insurance Corporation were drawn and surveyed. Among collected data, data for 422 primary caregivers were used for this study. The subjects used in this study consisted of family caregivers from various settings that give care to the elderly. The results of this study can be summarized as follows. First, caregiver's household income level is low. Therefore, caregiving families with the elderly are likely to have financial difficulties. Second, under coverage of long term care insurance system, the direct cost caregiving households pay for the elderly is still very high. Third, indirect cost of caregiving households accounted for the larger proportion caregiving costs. Fourth, social cost burden for caregiving the elderly is very high. This cost amount is appropriately equal to household income of caregivers surveyed in the research. Fifth, service use cost of caregiving households is differentiated by type of long term care service. Sixth, direct cost of caregiving households is statistically significantly differentiated by type of long term care service, but is differentiated less than service use cost. Seventh, social indirect cost for caregiving the elderly is statistically significantly differentiated by type of long term care service. Eighth, social cost amounts for the elderly utilizing long term care service is very high, total social cost per capita by types of long term care service tend to converge on average social cost per capita of total service.

• The Journal of Korean Institute of Communications and Information Sciences
• /
• v.35 no.8B
• /
• pp.1141-1149
• /
• 2010

Next Generation Networks (NGN) is defined as IP-based networks with multi-services and with multi-access networks. A variety of services and access technologies are co-existed within NGN. Therefore there are numerous transport technologies such as Differentiated Services (DiffServ), Multi-protocol Label Switching (MPLS), and the combined transport technologies. In such an environment, flows are aggregated and de-aggregated multiple times in their end-to-end paths. In this research, a method for calculating end-to-end delay bound for such a flow, provided that the information exchanged among networks regarding flow aggregates, especially the maximum burst size of a flow aggregate entering a network. We suggest an admission control mechanism that can decide whether the requested performance for a flow can be met. We further verify the suggested calculation and admission algorithm with a few realistic scenarios.

• Journal of Industrial Technology
• /
• v.24 no.B
• /
• pp.149-156
• /
• 2004

Quality services such as the integrated service and the differentiated service have been expected to be supported by public Internet as multimedia applications proliferate. Despite a lot of techniques for quality services have been devised, the prospect for the deployment of these techniques is not clear yet. In this research feasibility of real world quality service is investigated based on former experiments and recent trends in Internet applications. User network-based quality services are considered as the most feasible and economic short-term solution, which are also flexible in nature. Milestones and key technologies for some specific public network-based quality services are also described.