• Proceedings of the IEEK Conference
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• 2001.06a
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• pp.137-140
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• 2001

In this paper, we propose a multicast routing scheme for an efficient and reliable support of multicast service to mobile hosts in IPv6 based networks. The purpose of this paper is to develop an algorithm to reduce both the number of multicast tree reconstruction and the multicast service disrupt time using the RSVP scheme. The proposed multicast routing scheme is a hybrid method using the advantages of the hi-directional tunneling and the remote subscription proposed by the IETF Mobile IP working group. The proposed scheme satisfies the maximum tolerable transfer delay time and supports the maximum tunneling service. The simulation results show that the proposed scheme has better performance in the number of multicast tree reconstruction and the time of multicast service disrupt than the previous schemes does.

• Journal of Ubiquitous Convergence Technology
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• v.1 no.1
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• pp.47-52
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• 2007

In this paper, we present a virtual tourist system with realtime 3D visualization and the assistance of context information service. Our system enables a visitor to take a discovering tour on a virtual environment from a remote client by following navigator or by self-navigating. During the tour, the system provides immersive 3D graphics contents while supporting relevant information to the visitors corresponding to their positions in the virtual environment. When the visitors interact with interested objects, the context information service will also support introduction information for presenting about the objects. The introduction information based on text format is represented by a comfortable way-audio conversion to visitors in different languages depended on their preferences using TTS(Text-To-Speak) tool.

• Proceedings of the IEEK Conference
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• 2000.07b
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• pp.695-698
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• 2000

The services such as real-time audio and video applications have become increasingly popular, especially over the Internet. Furthermore, as being commercialized those contents on the Internet require quality of service (QoS) support to ensure their performance. PPP is the best solution to of for those kinds of services. The reason why we want to employ PPP is this satisfies most of the requirements associated with remote connectivity to an NSP, such as IP address assignment, security, and AAA (authentication, authorization and accounting). In addition, since ISPs and corporations are familiar with PPP based connectivity, easy migration from existing ISP infrastructure is expected, if QoS is guaranteed. But so for PPP has had no field to ensure the quality of service. This article presents the solution by using some tunneling protocols and the draft [1] that proposed additional LCP option fields to negotiate QoS. To communicate each other, after negotiating those option fields, over various protocols such as ATM, Ethernet, and etc. tunneling protocol is used. Following sections will mention those briefly. And the service provision to offer the end-to-end communication with negotiated QoS will also be proposed.

• Proceedings of the KSRS Conference
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• 2004.10a
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• pp.272-275
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• 2004

Recently, the services using position information of moving objects is embossed. Theses services needs the moving objects databases to manage moving object data with efficiency. To build the moving object databases, we must develop the moving object engine to mange, store, and search the spatio temporal data of moving object. The moving object engine has to support query syntax to search data that suitable for user need like LBS, Telematics, ITS, vehicle management system. In this paper, we design and implement the moving object engine to support service with moving object data. The moving object engine is able to support system environment that users are able to get the moving object data easily even they don't know complex data structure.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.10 no.7
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• pp.1229-1236
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• 2006

Group oriented multicast service is a prerequisite for the current application system for remote lecture and customer service. IP multicast is used to be generally accepted as an internet standard. IP multicast which is designed to support network based replication model can efficiently use host and network resource, however it has some weak points that it has to support IP multicast in the internet by adding multicast-capable internet infrastructure such as router and is vulnerable to security by using public IP address for group identifier. Therefore we propose the trigger based application level multicast model that can enhance both scalability and security by separating the functions, which send and receive message to solve these problems. Our suggested model is expected to ensure the promotion of quality of service and reliability.

• Smart Media Journal
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• v.1 no.1
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• pp.42-47
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• 2012

With the development of RFID and USN technology, kinds of services are appeared and industrialized to maximize management, maintenance and efficiency of production. In the agricultural field, it is important to increase productivity and quality of food by managing growth environment of plants. In this paper, to apply IT technology to agriculture, we present a mobile service application called WiSEMobile which support growers to monitor and manage the information in the field from remote sites. By using the service with mobile devices, farmers can monitor the change of environment with data from sensor nodes, manage and exchange kinds of data gathered by farmers in the field.

• Electronics and Telecommunications Trends
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• v.37 no.4
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• pp.19-27
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• 2022

The coronavirus disease 2019 (COVID-19) pandemic has significantly changed the Lifeline Program, a telecommunications rate discount program for low-income Americans. As the reliance on online activities such as remote work, distance education, and online shopping grows because of the spread of COVID-19, there is a concern that the digital divide will widen among low-income households that struggle to access internet infrastructure due to the burden of access rates. Accordingly, the US Congress passed a bill to help lower the internet bill for low-income households using the government budget to close the digital divide. The Lifeline Program, which is a part of the universal service obligation, has been in charge of the telecommunications rate discount for low-income households. However, according to the new law, the internet rate discount program based on the government budget was implemented beginning in 2021. As the internet rate discount based on the government budget begins, the US telecommunication rate discount system is transitioning from a system in which telecommunication industry support was borne by operators to one in which public support from the government budget will play a significant role. In this paper, we will look at recent changes in the US telecommunications rate discount program and their implications.

• Proceedings of the KSRS Conference
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• 2004.10a
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• pp.245-248
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• 2004

In this paper, we propose a framework for synchronization of spatial data between mobile devices and a server by using SyncML(Synchronization Markup Language) that is standard specification for synchronization protocol. We used GML (Geographic Markup Language) to support interoperability of spatial data between various data sources. We also used metadata and catalog service to access and integrate distributed spatial data, considering relationships of spatial data and non-spatial data.

• Journal of Digital Contents Society
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• v.5 no.4
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• pp.283-288
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• 2004

This paper presents research in intelligent massenger technique for Cyber University to support accessing university database. Proposed techniques enables better communication between students and professons by using intelligent messenger. Intranet based massenger support simple message transfer and multimedia chatting service within homogeneous network or members in same group. Using niversity database it provide personalize information for each different user demand needs and through managing technique user could effectively organize members of group. To embody intelligent massenger, JMF(Java Media Frame Work), RMI(Remote Method Invocation), XML techniques were proposed and in result constructing effective community.

• Proceedings of the Korea Society for Simulation Conference
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• 2005.11a
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• pp.3-7
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• 2005

The structure of $IP^2$(IP based-IMT Network Platform) as ubiquitous platform is three-layered model : Middleware including NCPF(Network Control Platform) and SSPF(Service Support Platform), IP-BB(IP-Backbone), Access network including Sensor network. A mobility management(MM) architecture in NCPF is proposed for $IP^2$. It manages routing information and location information separately. The existing method of multicast control in $IP^2$ is Remote Subscription. But Remote Subscription has problem that should be reconstructed whole Multicast tree when sender moves. To solve this problem, we propose a way to put Multicast Manager in NCPF.