• Proceedings of the Korea Information Processing Society Conference
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• 2004.11a
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• pp.35-38
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• 2004

센서 데이터 스트림 처리 기술은 유비쿼터스 컴퓨팅의 핵심 기술로 그 중요성이 날로 증대되어, 현재 산업계는 물론 학계에서도 그 역량을 이에 집중하고 있다. 본 논문에서는, 센서 데이터 스트림에 대한 특징 및 이를 처리하기 위한 산업계와 학계의 동향을 알아본다. 그리고, 대용량 센서데이터 스트림을 처리하기 위해 요구되어지는 기능을 정리하고, 이를 기반으로 센서 데이터 스트림처리 시스템의 구조를 설계한다.

• Proceedings of the Korean Information Science Society Conference
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• 2005.07a
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• pp.799-801
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• 2005

There have been many streaming servers that provide a large number of contents for a user's preference. General purpose streaming sewer makes use of a RTSP protocol for streaming controls such as message passing with client players. To date, there has been minimal research regarding streaming server's performance test tools. For measuring streaming server's performance, performance evaluation technique is needed and also achieved by RTSP based controls, a server's performance result and its miscellaneous test tools such the PseudoPlayer for pumping data to a specified port and the PseudoMonitor for gathering information. In this paper, We implement a test toolkit for evaluating a streaming server's performance and show the case of its application

• International Journal of Internet, Broadcasting and Communication
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• v.14 no.2
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• pp.225-230
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• 2022

The intelligent home network system integrates various devices in the home into one communication network to provide information sharing, control, and operation environment between devices. This intelligent home network system operates around a home server. Home appliances in the era of the 4th industrial revolution will have numerous home servers in logical areas as the intelligent home network in the home accelerates. Therefore, the need for systematic management of home servers is emerging. We propose an agent system for efficient intelligent smart home server management. The agent system monitors the home server and operating environment for home server management of the intelligent smart home network. By referring to this monitored information, the service module of the home server is managed, and the home server is dealt with whether it is normal or not. In addition, by referring to the information collected by the service agent created in the group management server while migrating the home server, it is possible to deal with integrated meter reading, crime prevention, and topics. And when a new service is applied to the home server, it is registered in the management server and distributed to the home server through the agent, so that the intelligent smart home network can be efficiently managed.

• Proceedings of the Korea Information Processing Society Conference
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• 2004.11a
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• pp.191-194
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• 2004

차세대 인터넷 서버는 인터넷을 통하여 여러 사용자에게 HDTV 급 고품질 멀티미디어 서비스를 제공하고자 개발된 시스템이며, 이를 위하여 디스크 연결 및 네트워크 기능을 정합 시킨 특화된 NS 카드를 개발하였다. Contents Container 파일 시스템은 NS 카드 전용으로 개발된 멀티미디어 파일 시스템이며, 본 논문에서는 Contents Container 파일 시스템에 대한 개발 내용을 기술하고, 개발 시스템의 장단점을 파악하고자 EXT3 파일 시스템과 비교 분석하였다.

• Proceedings of the Korean Information Science Society Conference
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• 2006.06a
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• pp.334-336
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• 2006

최근 들어 인터넷, 인트라넷을 통해 양질의 동영상 데이터를 네트워크 상으로 실시간 또는 사용자의 요구에 따라 전승해 주는 스트리밍 서비스에 대한 요구가 증가하고 있다. 아울러, 유비쿼터스 환경의 도래와 함께 센싱을 통한 다양한 멀티미디어 서비스의 확장이 이루어지고 있으며, 유/무선 환경에서 사용자의 콘텐트에 대한 요구를 끊김 없이/연속 이동을 통해 볼 수 있는 사용자 맞춤형 서비스가 필요로 되고 있다. 이에 본 논문에서는 센서기기를 연동해서 사용자를 인식하고 양질의 동영상을 사용자의 요구 시점에 이동성을 보장하면서 사용자의 다양한 단말 조건을 인식하여 멀티미디어 서비스를 제공하는 내용을 담고 있다.

• IEMEK Journal of Embedded Systems and Applications
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• v.1 no.2
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• pp.73-81
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• 2006

The home network is generally separated from the Internet, as it is made up of a private network due to security issues and the lack of IPv4 addresses space. Also, a user may want to move from a terminal to another terminal connected in the home network during communicating with people outside the home. In this case, people connected in the Internet, or another home network could not communicate the user at the home. These limitations prevent a SIP-capable device connected in the home network from communicating with another SIP-capable device connected in the Internet or the outside of the home network. To overcome the limitations, This paper proposes the Adaptive SIP Application Server System as a software architecture that a user inside of the home can communicate with people outside of the home when the home is composed of a private IP-based network. Moreover, the proposed architecture provides the session mobility that allows the user to maintain a media session even if changing the terminal inside of the home during the session established. The proposed system was implemented over a home server device which acts functionality as a connection point for transmitting IP packets between a home network and the Internet.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2001.04a
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• pp.523-528
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• 2001

In this paper, we describe the internet-based remote home automation system that con control and manage home appliances or digital devices bi-directionally through Internet. The platform-independency of VRML and Java applet enables users to access their home appliances and to check current state of them in t he virtual reality environment. The main focus is on three aspects. One is on the virtual reality technology to support the user interface efficiently by using 3D GUI in web-browser. Another is on the system architecture that consists of Home server and its manager server called Gate server in this paper. These servers have been implemented by Java RMI which is the basic single programming interface for distribution of objects and services using Java technology. The third, remote PLC controller and each digital devices are composed of home networking by PLC using CEBus protocol.

• Journal of KIISE:Computing Practices and Letters
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• v.9 no.5
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• pp.567-577
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• 2003

We usually applied PPP CHAP (Point-to-Point Protocol Challenge Handshake Authentication Protocol) when the visited ISP subscriber accesses to authentication server in own home ISP network and IP Assignment for remote Internet service. But PPP CHAP doesn't support in case of visited ISP subscriber in GPRS network accesses to authentication server in own home ISP network for wireless Internet service. We suggest solution this problem with PPP CHAP improvement. For this we propose the modified PPP CHAP message format, PCO Message format at MT, and interworking message and format between GGSN and RADIUS in home ISP network for wireless internet service of mobile ISP subscriber at GPRS network in this paper. We also show authentication results when visited mobile ISP subscriber via PPP CHAP at GPRS network accesses the RADIUS server in home ISP network.

• KSII Transactions on Internet and Information Systems (TIIS)
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• v.7 no.8
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• pp.2061-2080
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• 2013

Roaming authentication protocol is widely used in wireless network which can enable a seamless service for the mobile users. However, the classical approach requires the home server's participation during the authentication between the mobile user and the foreign server. So the more the roaming requests are performed the heavier burden will be on the home server. In this paper, we propose a new roaming authentication framework for wireless communication without the home server's participation. The new roaming authentication protocol in the new framework takes advantage of the ID-based cryptography and provides user anonymity. It has good performance compared with the roaming authentication protocols whose authentication do not need the home server's participation in terms of security and computation costs. Moreover, a new User-to-User authentication protocol in the new framework is also present. All the authentications proposed in this paper can be regarded as a common construction and can be applied to various kinds of wireless networks such as Cellular Networks, Wireless Mesh Networks and Vehicle Networks.

• International Journal of Advanced Culture Technology
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• v.4 no.3
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• pp.13-19
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• 2016

The growth of mobile devices in Internet of Things (IoT) leads to a number of remote and controlling system related IoT applications. For instance, home automation controlling system uses client system such web apps on smartphone or web service to access the home server by sending control commands. The home server receives the command, then controls for instance the light system. The web service gateway responsible for handling clients' requests attests an internet latency when an increasing number of end users requests submit toward it. Therefore, this web service gateway fails to detect several commands, slows down predefined actions which should be performed without human intervention. In this paper, we investigate the performance of a web server-side platgorm based event-driven, non-blocking approach called Node.js against traditional thread-based server side approach to handle a large number of client requests simultaneously for remote and controlling system in IoT remote monitoring applications. The Node.JS is 40% faster than the traditional web server side features thread-based approach. The use of Node.js server-side handles a large number of clients' requests, then therefore, reduces delay in performing predefined actions automatically in IoT environment.