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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.
The wireless ubiquitous network and various communication services are expected to be realized. The wireless ubiquitous network is defined as the converged network to integrate the mobile network with the fixed IP based network. First, the concept of wireless ubiquitous network architecture is shown which is based on IMS standardized by 3GPP. Next, Parlay is described as the solution of Open API approach...
Field data collection system to be described in this paper is an application example of the wireless sensor network. The purpose of the system is to provide more accurate analyzing method with the researchers in the remote sensing area by matching appropriate field data with the satellite data, which means to realize the ground truth in the area of remote sensing.
Mobile network has been tremendously increased in the number of users, diversity of applications and of interface technologies. Also mobile network need to provide sufficient adaptive End-to-End QoS management mechanism to provide enhanced user satisfaction. In this paper, we propose a new adaptive End-to-End QoS management mechanism based on the concept of utility function which we have borrowed...
This paper addresses to the issues (e.g. firewall, network congestion, access control, voice function) to be solved when the services like second life or OpenSim are accessed from the enterprise network environment and proposes the solutions for these issues. Especially this paper describes the cache server (e.g. design, evaluation result), the white list filtering system (e.g. design, scheme) based...
This paper addresses to the issues to be solved when the services like Second Life or OpenSim are used in the enterprise network environment and proposes the solutions for these issues. Especially this paper describes the Cache Server and the White List Filtering system based on the Information Server for the Second Life and OpenSim.
In this paper, the field data collection system to match the satellite data using location information is proposed based on the wireless sensor network. The purpose of the proposed system is to realize the ground truth in the area of remote sensing.
In recent years, the study of new network architectures has defined a clear trend towards using IP end-to-end. One of the most important issues for these types of all-IP networks is how to provide quality of service guarantees while a user is moving in wireless networks. The quality of service may degrade due to insufficient resources in the air links of any of the calling parties. In 3G cellular...
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