Kazunori Uchida

Learn More
We reported previously that astroglia cultured from aquaporin-4-deficient (AQP4-/-) mice migrate more slowly in vitro than those from wild-type (AQP4+/+) mice (J. Cell Sci. 2005;118, 5691-5698). Here, we investigate the migration of fluorescently labeled AQP4+/+ and AQP4-/- astroglia after implantation into mouse brains in which directional movement was(More)
Mobile Ad hoc Networks (MANETs) are attracting attention for their potential use in several fields such as collaborative computing and multimedia communications. MANET nodes cooperate in an autonomous way by forwarding packets to each-other. Considering mobility of the terminals, the routes change dynamically so routing algorithms are very important for(More)
This paper is concerned with an analysis of the back scattering of an electromagnetic wave by a target moving along just above a random rough surface such as desert, hilly terrain, sea surface and so on. First we introduce the discrete ray tracing method (DRTM) for the field analysis of back scattering. Second we investigate the effect of clutter due to(More)
Ground station scheduling problem arises in spacecraft operations and aims to allocate ground stations to spacecraft to make possible the communication between operations teams and spacecraft systems. The problem belongs to the family of satellite scheduling for the specific case of mapping communications to ground stations. Ground stations are terrestrial(More)
The main focus in the development of wireless communications engineering is providing higher data rates, using lower transmission power, and maintaining quality of services in complicated physical environments, such as an urban area with high-rise buildings, a randomly profiled terrestrial ground and so on. In order to achieve these goals, there has been(More)
Several solutions have been proposed for improving the Quality of Service (QoS) in wireless cellular networks, such as Call Admission Control (CAC) and handover strategies. However, none of them considers the usage of different interfaces for different conditions. In this work, we propose a Fuzzy-Based Multi-Interface System (FBMIS), where each node is(More)
This paper is concerned with an algorithm for generating inhomogeneous random rough surface (RRS) that can simulate physical environments such as desert, vegetation ground, sea surface and others, better than homogeneous RRS. First, we discuss statistics of RRS and the direct DFT method which can generate RRS with an arbitrary types of spectrum. Second, we(More)
This paper is concerned with an algorithm for generating the inhomogeneous random rough surface (RRS) of which statistical properties vary from place to place. The essence of the theory is based on the application of convolution method to generation of inhomogeneous RRS whose amplitude spectral density function together with its weighting function is given(More)