• Journal of Korea Multimedia Society
• /
• v.17 no.6
• /
• pp.706-715
• /
• 2014

It is used to lead to serious structural vulnerability of the system security of security-critical system when we have quickly developed software system according to urgent release schedule without appropriate security planning, management, and assurance processes. The Data Set and Provider of DataSnap, which is a middleware of Delphi XE2 of the Embarcadero Technologies Co., certainly help to develop an easy and fast-paced procedure, but it is difficult to apply security program and vulnerable to control software system security when the connection structure Database-DataSnap server-SQL Connection-SQL Data set-Provider is applied. This is due to that all kinds of information of Provider are exposed on the moment when DataSnap Server Port is sure to malicious attackers. This exposure becomes a window capable of running SQL Command. Thus, it should not be used Data Set and Provider in the DataSnap Server in consideration of all aspects of security management. In this paper, we study on the verification of the security vulnerabilities for Client and Server DataSnap in Dlephi XE2, and we propose a secure coding method to improve security vulnerability in the DataSnap server system.

• Journal of Korea Multimedia Society
• /
• v.17 no.11
• /
• pp.1307-1312
• /
• 2014

Online games are virtual space where it connects individual users through network connection to offer enjoyment of play games and game developer who service online games have to develop new contents and provide them to users to extend life of their service. Typically, in order to update new contents, all service companies have maintenance schedule to stop the game service for a while to update both server and client applications. Usually this process takes quite amount of time and users do not have any other choice but disconnected from server and wait until it is over. The purpose of this thesis is to describe the advantages of new design system which will allows users to continue to play the game even during the update. The main focus of this design is to make users feel more convenience in online gaming experience by move client from previous server to new server while users are still playing. If they can to connect current client with new server without any certificate validation process while users information from the client can automatically pass through to the new server, users may not need to experience maintenance for new contents update.

• The KIPS Transactions:PartB
• /
• v.9B no.2
• /
• pp.191-198
• /
• 2002

Recently, Usage of multimedia server is rapidly increased with expansion of internet that real-time displaying service for multimedia data, MPEG and etc. For these multimedia real-time applications, it is necessary to use a disk array as a storage system. For providing requested service to much more clients at the same time in a multimedia data storage server, considerable varied strategies in a several parts. But especially it is important feature to various parameters for disk array such as relation of striping block size as a system environment and characteristics of video data. In this paper, we implemented real environment of multimedia server which provides MPEG-1 files and evaluated the suitable storage system architectures by applying synthetically generated workloads in the various parameters for disk array.

• Journal of the HCI Society of Korea
• /
• v.1 no.2
• /
• pp.59-64
• /
• 2006

This paper describes UPnP AV System which provides various multimedia services in home network composed of diverse multimedia devices. It is difficult to build home network where various multimedia services can be provided because there are a lot of difference devices, platforms, and network technologies. However, UPnP middleware can make up multimedia service environment in that home network. Therefore this paper describes how the multimedia service environment is built with UPnP middleware. We analyze and modify MediaServer, MediaRenderer, and Control Point, which these are the components of UPnP AV archtecture. Additionally we provide some efficient GUI to use different kind of multimedia in any place of home networks. We propose UPnP AV Framework of playback module that consist of MediaServer providing contents, MediaRenderer using contents, and Control Point providing GUI. Especially, MediaRenderer and Control Point are integrated in set-top.

• Proceedings of the Korea Multimedia Society Conference
• /
• 2003.11a
• /
• pp.482-486
• /
• 2003

본 논문에서는 PC 또는 mobile phone에서 web server로 접속하여 모형 자동차를 무선 환경에서 원격으로 제어하는 기능을 Linux 기반의 embedded system을 이용하여 구현하였다. 본 system에는 IIS(Internet Information Service) 와 LODEK embedded system 및 ASP(Active Server Pages) 가 사용 되었으며 motor 제어 회로가 구현되었다.

• Proceedings of the Korea Multimedia Society Conference
• /
• 2001.06a
• /
• pp.477-480
• /
• 2001

무선 정보 환경의 변화에 따라 다양한 정보에 대한 풍족함이 요구되면서 양질의 정보를 정확하고 빠르게 선별하여 획득하는 기술이 점점 중요하게 되었으며, 이러한 페러다임의 요구에 Mobile Agent는 중요한 연구가 된다. 본 논문에서는 Mobile Agent가 가져야 할 보안적 요구사항 중 신뢰할 수 있는 Proxy Server를 이용한 인증을 통해 Sever와 Mobile Agent간의 안전한 통신 방법을 제시하며, Server나 Mobile Agent의 부정이 발견되었을 경우 DSS(Digital Signature Standard) 방식의 서명값을 이용하여 이를 증명함으로써 보다 안전하고 효율적인 상호인증 방식을 제안하였다.

• Proceedings of the Korea Multimedia Society Conference
• /
• 2002.05d
• /
• pp.735-740
• /
• 2002

컴퓨터 보급이 크게 증가하면서 모든 분야에 있어 그 활용성을 더해 가고 있으며 교육 분야에도 많은 영향을 주었다. 그로 인해 CAI(Computer Assisted Instruction)분야에 커다란 진전이 있었다. 최근 들어 멀티미디어 기술 및 컴퓨터 네트워크 기술이 획기적으로 발전되고 확산됨에 따라 같은 시간, 다른 장소에서의 E-Learning이 활발해지고 있다. 이것이 바로 Live E-Learning System이다. 이렇게 실시간으로 화상회의나, 강의가 이루어지는 E-Learning System에서 과연 어떻게 E-Learning System을 구축하고, 동작하는지에 대한 중요성이 강조 되고 있다. 본 논문에서는 Live E-Learning 시스템에서의 효과적인 네트워크 엔진 구현에 대한 방안을 제시하고자 한다.

• Proceedings of the Korea Multimedia Society Conference
• /
• 2002.05c
• /
• pp.469-473
• /
• 2002

고성능의 인터넷과 컴퓨터의 보급은 Online Game이 개발 될 수 있는 기반을 만들었다. 또한 게임에 관련된 프로나 채널이 생길 정도의 많은 관심은 Online 게임이 급성장을 이루는데 많이 도움을 주었다. 그러나 많은 Online 게임 사용자는 서버 접속률과 진행 속도 저하의 원인된다. 그래서 접속한 많은 Client를 효과적으로 다를 수 있도록 각 게임마다의 각 특성에 맞는 Game Server의 구현을 필요로 한다. 이 논문에서는 그것의 한 방법으로 여러 개의 그룹별로 게임을 하는데 효과적인 서버를 연결 리스트와 multi-thread를 이용하여 구현하였다. Client를 효과적으로 관리하기 위하여 각 데이터를 연결 리스트로 연결하고 multi-thread 사용하여 클라이언트의 요청을 처리하였다.

• Proceedings of the IEEK Conference
• /
• 2001.06c
• /
• pp.125-128
• /
• 2001

Nowadays, Internet users are widespread internationally. Fallowing the users requirements, server has to transfer real-time multimedia data to many clients. Multicast can significantly reduce the system overhead and the network resource waste, so it supports efficient mechanism when server has to transfer same data to many clients. We can deliver multimedia data transfer in real-time using Patching Algorithm which has no delay for service request. And multicast algorithm can support different network bandwidth using Receiver driven Layered Multicast under heterogeneous environment network. The purpose of this paper is to suggest an algorithm that can create new multicast group adequately and transfer real-time multimedia data efficiently under heterogeneous environment.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
• /
• 2001.05a
• /
• pp.269-274
• /
• 2001

This paper is study of buffering system for multimedia server. We propose the scheme that increasing the performance of multimedia sever by using the buffer sharing scheme and slot addressing algorithm to maximize fixed buffer utilization. Also, we calculate reference time about a used block and next stream reuse that stram. As a result, we propose the buffering system satisfy the users request using the extra bandwidth that reducing multimedia server I/O.