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In the future wireless communication systems, the broadband wireless technology which enables Giga-bps class data services is demanded. Broadband wireless channels become extremely frequency-selective and cause severe inter-symbol interference (ISI). Furthermore, the average received signal power changes in a random manner because of the shadowing and path losses according to the movement of a mobile...
This paper describes the current state of information security at local governments in Japan and recommends two approaches in order to come up with a better information security management framework. The Hyogo Prefectural Government, which has been playing a leading role in providing measures for safety and security of Japanese society since the Great Hanshin Awaji Earthquake, is used as a good representative...
This paper presents a virtual push-button interface created by drawing a shape or line in the air with a fingertip. As an example, we develop a four-button interface for entering multi-digit numbers by making pushing gestures within an invisible 2 x 2 button matrix inside a square drawn by the user. Trajectories of the fingertip movements entering numbers are captured with a 3D position sensor mounted...
The dependency of conversational utterances on the mode of dialogue is analyzed. A speech corpus of 800 speakers collected under three different modes, i.e., talking to a human operator, a WOZ system and an ASR system, is used for analysis. Some characteristics such as sentence complexity and loudness of the voice are found to be significantly different among the dialogue modes. Linear regression...
This paper proposes a method for controlling the voltage total harmonic distortion (THD) with a parallel simulated annealing technique. The nonlinear relationship between voltage harmonics and the voltage THD is identified using the revised group method of data handling (RGMDH) based on the self-organization technique. The voltage THD is controlled by some feature variables to decrease harmonic distortion...
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