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Search Results: 1 - 10 of 684 matches for " Kenichi Yukimatsu "
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Intelligent Transportation Systems Using Short Range Wireless Technologies  [PDF]
Razi Iqbal, Kenichi Yukimatsu
Journal of Transportation Technologies (JTTs) , 2011, DOI: 10.4236/jtts.2011.14017
Abstract: In this paper, we propose using ZigBee for Intelligent Transportation System (ITS). Most of the accidents these days are caused because of drivers not knowing the upcoming traffic hurdles like curves, traffic signals, railway lines and etc. If drivers come to know about the upcoming signals, curves, and railways lines etc the accidents can be avoided. The aim is to provide drivers with intelligent roads so that they can receive the information about the curves and the traffic signals ahead. After receiving the information about the signals ahead, drivers will be careful; this will help avoid the road accidents. Many researches are taking place in the world in the field of ITS and many useful systems are also built but no system is built using this remarkable ZigBee technology. ZigBee is low cost as compared to other short range wireless technologies which will help reduce the total cost of the system, enabling this system to be deployed in developing countries as well.
The Flexible Bus Systems Using Zigbee as a Communication Medium
Razi Iqbal,Kenichi Yukimatsu,Tatsuya Ichikawa
International Journal of Online Engineering (iJOE) , 2011, DOI: 10.3991/ijoe.v7i3.1579
Abstract: This paper describes a research on The Flexible Bus Systems (FBS) using Zigbee as a communication medium. The Flexible Bus System is a demand responsive transit (DRT) which is more efficient and convenient in a sense that it entertains passenger’s demands and gives bus locations in real time. The real time synchronization of The Flexible Bus System makes it information rich and unique as compared to other DRTs. The Flexible Bus Systems is a system that can replace the Traditional Bus Systems with its flexibility and efficiency. This paper discusses the use of wireless technologies in The Flexible Bus Systems and how to make it more reliable using short range wireless technology Zigbee.
Playing the Deficit Gamble Easily  [PDF]
Kenichi Tamegawa
Theoretical Economics Letters (TEL) , 2012, DOI: 10.4236/tel.2012.22037
Abstract: In this paper, we attempt to obtain the exact probability distribution of the debt-to-GDP ratio in T years, assuming that 1) the primary balance is zero and 2) the interest rate and the GDP growth rate are given as exogenous random variables. With this approach, researchers can play the “Deficit Gamble” without conducting a Monte Carlo simulation. Calculating the distribution of the debt-to-GDP ratio would be useful for policy planning.
A Biased Expectation Equilibrium in Indeterminate DSGE Models  [PDF]
Kenichi Tamegawa
Theoretical Economics Letters (TEL) , 2012, DOI: 10.4236/tel.2012.23053
Abstract: The aim of this article is to introduce a solution method for an indeterminate dynamic stochastic general equilibrium (DSGE) model. The method uses the concept of a biased expectation equilibrium, which is defined in this paper and means that expectations of certain variable are mechanically biased against those that would be rational. Our method should be particularly useful in terms of empirical estimation using DSGE models, because it will allow researchers to estimate how much agents’ expectations are biased in the case where a model has indeterminacy.
Irradiance and Developmental Stages of Crown Architecture Affect Shoot Production in Rhododendron reticulatum  [PDF]
Kenichi Yoshimura
American Journal of Plant Sciences (AJPS) , 2013, DOI: 10.4236/ajps.2013.45A011
Abstract:

Plasticity in crown architecture, contributing to leaf arrangement within crown, is an important feature for whole plant carbon assimilation and survival. In this study, I examined the plasticity in crown architecture to light condition and developmental stage by the changes in shoot production. Rhododendron reticulatum expands crown with orthotropic growth in monopodial branching in young stage, but orthotropic growth is ceased in adult stage. Main stem of young crown is described with monopodial branching regardless of light environment. But multi-layer crown is observed in sun-lit environment rather than mono-layer crown in adult stage. Long shoot production for each branching system (foliage derived from sympodial branching) in young crown is associated with local light environment, but not in adult crown. Long shoot production rate is correlated with long shoot production rate of its mother shoot in young crown, but not in mono-layer crown. These results suggest that young crown expands branches to sun-lit position whereas adult crown reduces congestion of shoots with stochastic shoot production regardless of shoot production of mother shoots. I concluded that both light and developmental stage are important factors for shoot production and constructing crown architecture.

Erratum to “Irradiance and Developmental Stages of Crown Architecture Affect Shoot Production in Rhododendron reticulatum” [American Journal of Plant Sciences 4 (2013) 69-76]  [PDF]
Kenichi Yoshimura
American Journal of Plant Sciences (AJPS) , 2014, DOI: 10.4236/ajps.2014.513214
Abstract:

The original online version of this article (Yoshimura, K. (2013) Irradiance and Developmental Stages of Crown Architecture Affect Shoot Production in Rhododendron reticulatum. American Journal of Plant Sciences, 4, 69-76. http://dx.doi.org/10.4236/ajps.2013.45A011) was published as a single-author paper mistakenly. To reflect the contribution and responsibility of the second author as well as the affiliations of the authors at the time of the study, we have revised the authorship and author affiliations of this article. The author wishes to correct the errors as:


Kenichi Yoshimura1,2, Hiroaki Ishii1

1Graduate School of Science and Technology, Kobe University, Kobe, Japan

2Present Address: Center for Ecological Research, Kyoto University, Otsu, Japan

Email:

Mechanical Properties of a Vacuum-Sintered Apatite Body for Use as Artificial Bone  [PDF]
Kenichi Tamura
Journal of Biomaterials and Nanobiotechnology (JBNB) , 2015, DOI: 10.4236/jbnb.2015.61005
Abstract:

Regenerative artificial bone material and bone parts were fabricated using vacuum-sintered bodies of a “titanium medical apatite (TMA?)” that is formed by chemically connecting Ti oxide molecules to the reactive [Ca10 (PO4 )6 ] group of hydroxyapatite (HAp). Sintering at temperatures of 1273 - 1773 K caused this TMA sintered bodies to recrystallize and form a varying mix of α-TCP (tricalcium phosphate), β-TCP and Perovskite-CaTiO3 phases. The Perovskite crystals proved to be quite stable and hard, forming a uniform distribution of similarly sized fibers in all directions under vacuum sintering, but an irregular distribution and size when sintered in the presence of oxygen. Complete recrystallization was achieved by vacuum sintering at temperatures in excess of 1473 K. In particular, TMA vacuum-sintered bodies at 1573 K are given the maximum value; a Vickers hardness of 400, a bending strength of 43 MPa, a compressive strength of 270 MPa and a density of approximately 2300 kg/m3 was achieved that closely corresponds to that of compact bone or a tooth. As these TMA bodies could also be cut into various forms, they are considered a promising biomaterial for use as artificial bone in the regeneration of natural bone, or to provide reinforcement of bone junctions in dental and orthopedic surgery.

Usage of Pythagorean Triple Sequence in OSPF  [PDF]
Simon Tembo, Ken-ichi Yukimatsu, Shohei Kamamura, Takashi Miyamura, Kohei Shiomoto, Atsushi Hiramatsu
Communications and Network (CN) , 2012, DOI: 10.4236/cn.2012.41010
Abstract: Shutting down a link for the purposes of a scheduled routine maintenance does cause the forwarding path to change. If these changes are not done in a required order will cause not only transient micro loops but also an overload in some links. Currently, some ISP operators use a graceful link shutdown procedure by first setting up the Interior Gateway Protocol (IGP) link metric to MAX_METRIC -1 and then shutdown the link. In this paper, we present a Pythagorean Triple Metric Sequence as a method to use to shutdown a link during such network operations. Conducting a link shutdown of any desired link for maintenance purpose is a very delicate duty that requires extreme care to prevent transient loops during such topological changes. We thus wish to demonstrate that there exists a Pythagorean Triple Metric Sequence for any given link that can be used to shutdown a link during the routine maintenance by ISPs.
Synthesis, Acid and Base Resistance of Various Copper Phosphate Pigments by the Substitution with Lanthanum  [PDF]
Onoda Hiroaki, Okumoto Kenichi
Materials Sciences and Applications (MSA) , 2011, DOI: 10.4236/msa.2011.23026
Abstract: Transition metal phosphates are used as inorganic pigments, however these materials have a weak point for acid or base resistance. Because lanthanum phosphate is insoluble in acidic or basic solution, the addition of lanthanum was tried to improve the acid or base resistance of copper phosphate pigment. Various cooper – lanthanum phosphates were synthesized in wet (H3PO4, Cu(NO3)2, La(NO3)3) or dry (H3PO4, CuCO3●Cu(OH)2●H2O, La2O3) processes. The additional effects of lanthanum were studied on the chemical composition, particle shape and size distribution, specific surface area, color, acid and base resistance of the precipitates and their thermal products.
Link Stress Reduction against Bursty Arrivals of Content Requests  [PDF]
Kenichi Yamashita, Kazumasa Oida
Int'l J. of Communications, Network and System Sciences (IJCNS) , 2012, DOI: 10.4236/ijcns.2012.55036
Abstract: Content delivery networks are designed to extend the end-to-end transport capability of the Internet to cope with increases in video traffic. For further improvement, bursty request arrivals should be efficiently addressed. As opposed to previous approaches, in which the best client-server pair is individually selected (individual optimization), this paper proposes an algorithm for dealing with simultaneous arrival requests, in which client-server pairs are selected such that all requests receive good service (social optimization). The performance of the proposed algorithm is compared with that of the closest algorithm, an individual optimization algorithm, under the condition that a large number of requests arrive simultaneously. The evaluation criterion is the worst link stress, which is the largest number of streams per link. The numerical results show that the proposed algorithm is effective for large-scale networks and that the closest algorithm does not provide near-optimal solutions, especially when all requests arrive in a small part of the network or when there are many servers.
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