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A new design of THz photonic crystal (PC) the photonic band gap (PBG) of which is mechanically controllable is proposed. The PC is composed of metal rods with a two-dimensional square lattice. To confine THz wave perpendicular to the periodicity plane, the PC is sandwiched by parallel metal plates with air gap between the upper plate and the PC rods. The THz properties have been studied by a finite-difference...
With increase in the heterogeneity and complexity of the Internet, many problems have emerged in the traditional TCP Reno. Against the problem, we have proposed a new bandwidth- based TCP congestion control mechanism, TCP Symbiosis. Unlike the recent works on delay-based and hybrid congestion control, TCP Symbiosis relies on the bandwidth measurement to control the congestion window size. Although...
Over the broadband internet, we often use video contents. In addition, not only broadcast but also IPTV are used in large display and PC now. In these cases, basically speaking, we think that they enjoy some video contents in fixed TV environments. Moreover, in this paper, we pay attention to ??Video Contents Distribution System??, and once they receive some contents data, we have to consider how...
In recent years, the standardization of news management and transmission format has advanced, and NewsML (news markup language) has appeared. NewsML is a format which was decided by the IPTC (International Press Telecommunications Council). In this paper, we propose a next generation news management system based on an environment in which news management, transmission, and editing are performed. Concerning...
We often use video data of simulcast type to provide video content of quality selection over broadband network. But its type is not superior from the viewpoint of the efficiency of transmission and data storage. In this paper, we propose the CDS: "contents download service" system based on human behavior. We present the distributed system of contents delivery for users using contents reservation...
Recently, network has been fast every year, so video contents services have been spreading in world wide. Especially, as the applications using video, they began to pay attention to education fields. However, there are some problems to build a market, such as, the cost of producing the video contents, the plan as learning tools and the integrated system for contents utilization, and so on. It is the...
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