• Journal of Korea Spatial Information System Society
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• v.6 no.2 s.12
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• pp.85-95
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• 2004

Nowadays, the interests in travel are increasing with the changes into the ubiquitous computing environments, hence, our location-based travel information service system would be potentially invaluable to graft the Internet business models. Most of existing travel information services are provided in a one-way push manner from the contents providers to users, and they have drawbacks of enforcing users to search their needed information with the general Web surfing. Therefore, this paper propose the travel information system for gathering user information and for providing services that satisfy user requirements by filtering based on these information.

• The Journal of Korean Association of Computer Education
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• v.5 no.1
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• pp.57-66
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• 2002

Real time multimedia data services have been made possible by the rapid development of the computer and internet technology. Based on the technology, Many multimedia system developer try to use VOD(Video on Demand) and GVA technologies for distance education. However the system has mainly been developed to provide the video screen of good quality in real time and to compose contents efficiently. Not many researches and developments have been made for providing the users that is taking distance education with various types of service using VOD and GVA. Therefore In this paper we have designed and implemented an active on-demand multimedia service system to improve user-side service quality in distance education using VOD and GVA service. The on-demand multimedia service system can prominently help users to save the time and effort to search and select the studying data by this paper enables off-line search functions through E-mail and periodical current awareness service supported by PUSH technology, user oriented information booking supported by SDI service and feedback service.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.38B no.5
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• pp.344-354
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• 2013

In this paper, In order to solve the traffic of the SNS to be executed on smartphone, we propose the design of the SNS integrated gateway server. Also, we capture the payload size in a variety of methods to send the MQTT protocol and QoS level of MQTT protocol for communication between the client and the Gateway. And we present the results and analysis of packet loss and end-to-end delay. By using analysis proposed, we present the results of the integrated SNS Gateway push notification protocol design.

• Annual Conference of KIPS
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• 2002.11a
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• pp.293-296
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• 2002

기존의 동적 문제 출제 시스템은 사용자가 제한적인 인터페이스 형태인 무선 단말기를 사용하여 복잡한 과정과 지루한 페이지 로딩을 기다린 후에야 사이트에 접속되는 불편한 점들을 가지고 있다. 본 논문에서는 이러한 불편한 점들을 조금이나마 해결하고자 사용자가 사이트에 접속하는 형태가 아닌 사이트에서 사용자에게 메시지를 보내어 바로 접속하는 시스템을 제안한다.

• Journal of Korea Multimedia Society
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• v.12 no.2
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• pp.257-271
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• 2009

In this paper, we propose a protocol compression scheme for enhancing the performance of call processing of PTT(Push-to-Talk) which is one of the important services in IMS(IP Multimedia Subsystem), a next generation integrated wired/wireless packet communication network. To service the PTT on an IMS network, it should use the same call setup procedure as legacy Mobile and TRS(Trunked Radio System) networks and have a fast call setup time and enough communication bandwidth because a number of terminals should be able to exchange same data in real time. The proposed A+SigComp scheme reduces the initial call setup delay of SIP by about 10%, which is used by PTT service for call setup. In addition, the A+ROHC scheme is proposed to compress the header of RTP packets transferred during PTT voice transmission and, as a result, about 5% of increase in communication efficiency is observed.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.25 no.2
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• pp.280-285
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• 2021

When VNDN technology is used as a communication technology for infotainment application services of connected vehicles, it is possible to realize data-centric networking technology in which data is the subject of communication.Vehicle security attacks and hacks, performance degradation during long-distance data transmission, and frequent data loss It is possible to innovate the limitations of the current host-oriented Internet-based infotainment application service technology of connected vehicles. The data packet forwarding issue to deliver critical information data that is very sensitive to delay in the VNDN on a push-based basis to RSU (Road Side Unit), etc. is one of the issues to be solved for realizing VNDN-based application services. We comprehensively analyze existing forwarding techniques to support push-based data traffic under the environment, and compare and analyze each technique in terms of performance.

• Proceedings of the CALSEC Conference
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• 2001.02a
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• pp.149-156
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• 2001

온라인 컨설팅이란 business Consulting, IT Consulting, Tax ＆ Audit Consulting 등의 일반 컨설팅 서비스가 다양한 방식에 의해 Online으로 제공되는 모델을 말한다. 현재 온라인 컨설팅은 시장의 요구에 따른 서비스 발생이 아닌 공급자에 의한 Push-Service라고 할 수 있다. Ernst ＆ Young, Arthur Andersen, Cambridge Technology Partners, IBM, Deloitte Consulting, Robbins-Glola, Mainspring, Bain ＆ Co 등 컨설팅 회사들은 기존 대기업 위주 컨설팅과 함께 특정화된 문제에 대한 특정한 솔루션을 제공하는 저비용 서비스에 의한 중소기업 대상의 신규 시장 창출의 필요성을 느끼고 있다. 또한, 국내 온라인컨설팅의 개념, 선진 컨설팅 업체의 온라인 컨설팅 사업현황, 사업모델, 향후 전망, 사업의 성공요소에 대해서 살펴본다.

• 한국정보통신설비학회:학술대회논문집
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• 2005.08a
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• pp.27-29
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• 2005

본 논문은 유무선 IP단말기에 다양한 컨텐츠를 제공하는 푸시 서비스 제공 솔루션을 설계하고, 이를 이용하는 네 가지 응용서비스 모델을 제시함으로써 IP-PBX/IP-Centrex와 같은 기업용 통신 솔루션[1]과 연계하여 신규 서비스를 제공할 수 있는 방안을 제시한다.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.35 no.6B
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• pp.921-929
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• 2010

Group communication that involves the setup of a list of users has been a topic of interest in mobile industry. Push to Talk over Cellular (PoC), a group communication service for cellular phone network, is a type of half duplex communications that allows a single person to reach an active talk group without making several calls, but a single button press. Based on this service, we build a new protocol called Push to Talk over Mobile Wimax that uses group communication service in 802.16e network. Also, weper formed simulation to verify and evaluate performance of the designed service in Mobile Wimax network. From the results of performance evaluation, network administrators can evaluate the stability of network and make a better of network's shortcoming and have decision to build the robust network.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.16 no.7
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• pp.4878-4883
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• 2015

The IP Multimedia Subsystem(IMS) is a framework that provides access to the content of Internet and Telecom services anytime and anywhere with guaranteed Quality of Service(QoS) and manageability by separating control functions from bearer and services. The Service Delivery Platform(SDP) provides common interfaces and protocols to deploy existing or new services in an efficient way. Therefore SDP over IMS plays a role of bridge between established network and new IMS network by simplifying the interaction among application services. In order to enrich the multimedia network communication, we try to deploy the Push-to-talk over Cellular(PoC) service which is considered as the outstanding and distinguished half-duplex Voice over IP(VoIP) application service among deployable candidate services over mobile network. In this paper we investigate the advantages of PoC service and PoC architecture firstly, and then focus on the its practical implementation for the prototype to validate the feasibility of its deployment and realization.