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This paper describes VoIP system for the enterprise network based on Asterisk. First the main ideas and the features of the VoIP system are described that we have developed by using Asterisk in the Intranet environment. Then the new scheme to realize high security by using Open VPN is described when developing the large scale enterprise network.
In this paper, a ballooned wireless mesh network is proposed to promptly insure communication means to grasp the information with disaster area, residentpsilas safety and relief goods on the occurrence of disaster. By combining multiple ballooned wireless network nodes, a large mesh network is organized in the sky on the disaster area and can cover shelters or interrupted communication area as urgent...
Natural disasters such as earthquake, tsunami, typhoon and hurricane in addition to annual disaster have frequently happened at many places around the world. Once disaster happened, communication network and information system are seriously damaged and communication means for residents cannot be used in the disaster area. Therefore, it is required to prepare emergency network system which can be quickly...
In this paper, a flexible middleware system for omni-directional video transmission for various teleconferencing applications is introduced. The omni-directional image has more advantages in that it provides a wider view than a single directional camera and able to realize flexible TV conferencing even between remotely separated small rooms. In this paper, we describe system architecture and functions...
In this paper, a flexible middleware system for omni-directional video transmission for various teleconferencing applications is introduced. The omni-directional image has more advantages in that it provides a wider view than a single directional camera and able to realize flexible TV conferencing even between remotely separated small rooms. In this paper, we describe system architecture and functions...
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