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Hiroshima, Japan

Hiroshima City University is a public university at Hiroshima, Hiroshima, Japan, founded in 1994, educating both undergraduates and graduate students. HCU is especially distinctive for its Peace Studies program, in line with Hiroshima's status as an international city of peace. Wikipedia.

Kakuda Y.,Hiroshima City University
Proceedings - Symposia and Workshops on Ubiquitous, Autonomic and Trusted Computing in Conjunction with the UIC 2010 and ATC 2010 Conferences, UIC-ATC 2010 | Year: 2010

Assurance network technologies are necessary to realize trustable terminal/infrastructure service applications for new generation networks. This invited paper outlines our project of research titled "Fundamental Concepts of Assurance Network Technologies and Their Case Studies" and shows concepts and technologies of assurance networks and case studies for mobile ad hoc networks. © 2010 IEEE.

Okayama T.,Hiroshima City University
Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) | Year: 2016

This paper reinforces numerical iterated integration developed by Muhammad–Mori in the following two points: (1) the approximation formula is modified so that it can achieve a better convergence rate in more general cases, and (2) an explicit error bound is given in a computable form for the modified formula. The formula works quite efficiently, especially if the integrand is of a product type. Numerical examples that confirm it are also presented. © Springer International Publishing Switzerland 2016.

Ahn C.-J.,Hiroshima City University
Digital Signal Processing: A Review Journal | Year: 2010

In MIMO systems, channel estimation is important to distinguish the transmitted signals from multiple transmit antennas. When MIMO systems are introduced in cellular systems, we have to measure the received power from all the connectable base station (BS), as well as to distinguish all the channel state information (CSI) for the combination of transmitter and receiver antenna elements. One of the most typical channel estimation schemes for MIMO in a cellular system is to employ a code division multiplexing (CDM) scheme in which a unique spreading code is assigned to distinguish both BS and MS antenna elements. However, by increasing the number of transmit antenna elements, large spreading codes and pilot symbols are required to estimate an accurate CSI. To reduce this problem, in this paper, we propose a high time resolution carrier interferometry (HTRCI) for MIMO/OFDM to achieve an accurate CSI without increasing the number of pilot symbols. © 2010 Elsevier Inc. All rights reserved.

Kojima A.,Hiroshima City University
FPT 2013 - Proceedings of the 2013 International Conference on Field Programmable Technology | Year: 2013

Blokus Duo is a board game for two players, which uses 21 different shapes of tiles and 14×14 board. We implement Blokus Duo player design on FPGA by using hardware-software co-design method. In this paper, we describe the structure and the algorithm which are used in our Blokus Duo player design. It uses alpha-beta pruning and iterative deepening depth-first search by software and evaluation function by hardware in the current version. The hardware-software co-design implementation is about seven times faster than the original software code. © 2013 IEEE.

Okubo H.,Hiroshima City University
American journal of physiology. Gastrointestinal and liver physiology | Year: 2015

Several lines of evidence have suggested a role of gut microbiota in the etiology of nonalcoholic steatohepatitis (NASH). NASH subjects reportedly showed a prolonged orocecal transit time coexistent with small intestinal bacterial overgrowth. We considered the possibility that enhanced gastrointestinal motility would influence gut microbiota and thus investigated the effects of the gastroprokinetic agent mosapride citrate (MC) on gut microbiota and the development of NASH using a methionine-choline deficient (MCD) diet-fed rodent model. Mice were divided into three groups, given the normal chow diet (NCD), the MCD diet, or the MCD diet containing 10 mg·kg(-1)·day(-1) of MC (MCD plus MC) for 6 wk. NASH development was evaluated based on hepatic histochemical findings, serum parameters and various mRNA and/or protein expression levels. MC treatment suppressed MCD diet-induced NASH development, with reduced serum lipopolysaccharide and increased plasma glucagon-like peptide-1 (GLP-1) concentrations. Calculation of the relative abundance of each strain based on gut microbiota analyses indicated lactic acid bacteria specifically, such as Bifidobacterium and Lactobacillus, in feces to be decreased in the MCD, compared with the NCD group. Interestingly, the reduction in lactic acid bacteria in the MCD diet group was reversed in the MCD plus MC group. In addition, colon inflammation observed in the MCD diet group was reduced in the MCD plus MC group. Therefore, MC showed a protective effect against MCD diet-induced NASH development in our rodent model, with possible involvements of increased fecal lactic acid bacteria, protection against colon inflammation and elevated plasma GLP-1. Copyright © 2015 the American Physiological Society.

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