• Journal of the Korea Computer Industry Society
• /
• v.5 no.2
• /
• pp.293-300
• /
• 2004

In this paper, we devise both methods supporting interactive VCR-like functions for MPEG stream and minimizing the storage space. Specifically, we proposed both methods to efficiently stripe MPEG stream into multiple disks, and an access strategy to retrieve the distributed streams over the disks. To accurately locate the streams to be referred to, we introduce a table indexing the location. When client request Fast Forward(FF)/Fast Backward(FB), VOD(Video on Demand) server refer to this index table supporting FF/FB functions. Experimental result shows that the proposed method can reduce the additional storage space needed when VOD server services FF/FB functions.

• Journal of the Institute of Electronics Engineers of Korea TC
• /
• v.48 no.11
• /
• pp.28-34
• /
• 2011

In CDMA-based systems, recently, researches on chip-level equalization have been studied in order to improve receiving performance when supporting high-rate data services. In this paper, we propose Griffiths' algorithm based chip-level adaptive LMMSE equalizers for HSDPA MIMO systems using D-TxAA (dual stream transmit antenna array). First, we will derive two possible structures of Griffiths' algorithm based equalizer, and then compare their performance through computer simulations in various mobile channel environments.

• Journal of Korean Public Health Nursing
• /
• v.8 no.2
• /
• pp.71-82
• /
• 1994

The article reviewed the elderly health care management problems in policy development issue of the nation. Policy of Korean government on elderly health care has still not yet developed. The main stream of policy which is effective on elderly welfare policy is 'Elderly care are responsible by their families'. Now only those aged whose family members are not able to take care of their parents are receive custodial care at the non-profit nursing homes. This article examined the main stream policy in pro and cons aspects in relation to social changes such as: demographic changes. family structure changes. attitude changes. health care delivery system. and political settlement view points in connection with medical insurance program. Finally. a model for the elderly health care management was proposed which will provide chronic care services at the community level. such as nursing homes. day care centers. day hospitals, respite care units, and special care institute for dementia.

• Journal of Broadcast Engineering
• /
• v.6 no.3
• /
• pp.234-245
• /
• 2001

According to market needs of better quality of service (QoS) for realtime multimedia services over Internet, they haute been standardizing RSVP, Intserv, and DiffiServ. This paper combines the benefits of RSVP/IntServ with scalable video encoding. We Propose that more important bit stream is given more priority such that limited network resources are reserved for the stream Various prioritizing approaches are proposed and compared to normal approach by using Network Simulator. The calculated QoS parameters such as Packet loss rate are used to calculate degree of degradation in video quality.

• Proceedings of the Korean Institute of Intelligent Systems Conference
• /
• 2006.11a
• /
• pp.408-411
• /
• 2006

Currently, the nano economy threatens the mass economy. This is based on the internet business models. In the nano business models based on internet, the diversely personalized services are needed. Many researches of the personalization on the web have been studied. The web usage mining using click stream data is a tool for personalization model. In this paper, we propose an internet business model using evolutionary support vector machine and web response survey as a web usage mining. After analyzing click stream data for web usage mining, a personalized service model is constructed in our work. Also, using an approach of web response survey, we improve the performance of the customers' satisfaction. From the experimental results, we verify the performance of proposed model using two data sets from KDD Cup 2000 and our web server.

• Journal of the Korea Society of Computer and Information
• /
• v.16 no.12
• /
• pp.71-81
• /
• 2011

The EMR management services can monitoring the patients' record with any doctors in any hospital by using the internet and smartphones online. To handle the real time, multidimensional, continuous data, database management systems (DBMS) must cope with high insert rates for updates, however the traditional DBMS suffers from processing these kinds of data due to its serious design bottlenecks. So the researchers put forward to Data Stream Management System (DSMS). In this paper we describe the real-time Data Stream Server for Continuity of Care Record (CCR) that including continuos query processor. This system is compiled with DSMS and DBMS in EMR system for processing and monitoring the coming CCR data stream, and also storing the processed result with high-efficiency. The system enables users not only to query stored CCR information from DBMS, but also to execute continue query on real-time CCR Data Stream, and health information can be transferred between different healthcare providers that would reduce medical error. At last, we develop a IPhone mobile application to test the proposed real-time data stream server.

• Journal of the Korean Society of Environmental Restoration Technology
• /
• v.21 no.1
• /
• pp.31-40
• /
• 2018

Since the Millennium Ecosystem Assessment Report was published in 2005, the conflict between development and the preservation of the ecological environment has turned to paying attention to value assessments in rational decision-making. In recent years, the concept of ecosystem services has been recognized as a viable one for making significant decisions. However, a trade-off between increase and decrease occurs between the ecosystem services sub-categories (cultural service, regulating service, supporting service, and provisioning service), for which research centering on target sites is needed. To this end, the present study aims to investigate the trade-off relationship between service categories to search for reasonable decision-making strategies. As the research method, a survey was conducted using the translated version of SoIVES(Social Value for Ecosystem Services) 3.0 questionnaire of the United States Geological Survey. The research findings demonstrate the economic value, based on the derived monetary value of each service category, the economic value of the target site was compared among landscape aesthetic value 8,050,000 won, recreation value 6,750,000 won, biodiversity value 4,610,000 won, healing value 3,970,000 won, life-sustaining value 2,090,000 won, and productive value 220,000 won. And then the primarily recognized value criteria of the Tancheon ecosystem services illustrate landscape aesthetic and recreation value. Besides, this study illustrates visualized trade-off relationships based on user perception, and the derived relations illustrate the trade-off relationship between the cultural service, regulating service, supporting service, and provisioning service, as well as relationships between the components of the sub-categories.

• Journal of Digital Contents Society
• /
• v.19 no.3
• /
• pp.471-477
• /
• 2018

As time changes, users change their interest. In this paper, we propose a method to provide suitable service for users by dynamically weighting service interests in the context of age, timing, and seasonal changes in ubiquitous environment. Based on the service history data presented to users according to the age or season, we also offer useful services by continuously adding the most recent service rules to reflect the changing of service interest. To do this, a set of services is considered as a transaction and each service is considered as an item in a transaction. And also we represent the association of services in a graph and extract frequent service items that refer to the latest information services for users.

• Journal of the Korea Society of Computer and Information
• /
• v.16 no.2
• /
• pp.243-248
• /
• 2011

According to increasing of accessing multimedia stream contents, Web services have become popular. However, these Web services are not supported with the same quality to Web clients who frequently access multimedia services. This paper proposes ontological technique to apply client level Quality of Service(QoS) that provides two different levels to serve Web service with proper quality by contribution value. And, it describes with UML(Unified Modeling Language) how to relate QoS and SLA(Service Level Agreement). Main contribution of this paper is to support client level QoS and SLA and to use Ontology for it. Therefore, this work uses an ontology-based approach to organize QoS and SLA, enabling semantic classification of all Web services based on domains and QoS and SLA attributes.

• The Journal of Korean Institute of Communications and Information Sciences
• /
• v.25 no.6A
• /
• pp.918-926
• /
• 2000

A huge storage and broad bandwidth are required to provide subscribers with VoD services. Hence, there is a huge amount of cost in establishing networks for VoD services. To determine how to reduce the cost, a number of studies involving such as distributed server systems, multicasting, program caching, stream sharing, are currently in progress. In this paper, a request criterion for multicast service and the ratio of required bandwidth for unicast to multicast are generated. The effect of multicast service on network bandwidth, server bandwidth, and buffer size was analyzed and validated through computer simulation. The results of this study could be applied to efficient designing networks for VoD services.