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Search Results: 1 - 10 of 1201 matches for " Tomoyuki Takano "
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On the amplitude of External Perturbation and the Chaos via Devil's Staircase -Stability of Attractors -
Sadataka Furui,Tomoyuki Takano
Physics , 2013,
Abstract: We made the chaotic circuit proposed by Chua and the memristic circuit proposed by Muthuswamy and Chua, and analyzed the behavior of the voltage of the capacitor, electric current in the inductor and the voltage of the memristor by adding an external sinusoidal oscillation ${\dot y}(t)\simeq {\dot i_L}(t)$ of a type $\gamma\omega \cos\omega t$, while the ${\dot x}(t)\simeq {\dot v_C}(t)$ is given by $y(t)/C$, and studied the Devil's staircase route to chaos. We compared the frequency of the driving oscillation $f_s$ and the frequency of the response $f_d$ in the window and assigned $W=f_s/f_d$ to each window. When capacitor $C=1.0$, we observe stable attractors of Farey sequences $\displaystyle W=\{\frac{1}{2}, \frac{2}{3},\frac{3}{4},\frac{4}{5}, \cdots ,\frac{14}{15},\frac{1}{1}\}$, which can be interpreted as hidden attractors, while when $C=1.2$, we observe unstable attractors. Possible role of octonions in quantum mechanics and Cartan's supersymmetry is discussed.
On the Amplitude of External Perurbation and Chaos via Devil's Staircasein Muthuswamy-Chua System
Sadataka Furui,Tomoyuki Takano
Physics , 2014,
Abstract: We recently analyzed the voltage of the memristic circuit proposed by Muthuswamy and Chua by adding an external sinusoidal oscillation $\gamma\omega \cos\omega t$ to the ${\dot y}(t)\simeq {\dot i_L}(t)$, when the ${\dot x}(t)\simeq {\dot v_C}(t)$ is given by $y(t)/C$. When $f_s
Liquid-Phase Packaging of a Glucose Oxidase Solution with Parylene Direct Encapsulation and an Ultraviolet Curing Adhesive Cover for Glucose Sensors
Seiichi Takamatsu,Hisanori Takano,Nguyen Binh-Khiem,Tomoyuki Takahata,Eiji Iwase,Kiyoshi Matsumoto,Isao Shimoyama
Sensors , 2010, DOI: 10.3390/s100605888
Abstract: We have developed a package for disposable glucose sensor chips using Parylene encapsulation of a glucose oxidase solution in the liquid phase and a cover structure made of an ultraviolet (UV) curable adhesive. Parylene was directly deposited onto a small volume (1 μL) of glucose oxidase solution through chemical vapor deposition. The cover and reaction chamber were constructed on Parylene film using a UV-curable adhesive and photolithography. The package was processed at room temperature to avoid denaturation of the glucose oxidase. The glucose oxidase solution was encapsulated and unsealed. Glucose sensing was demonstrated using standard amperometric detection at glucose concentrations between 0.1 and 100 mM, which covers the glucose concentration range of diabetic patients. Our proposed Parylene encapsulation and UV-adhesive cover form a liquid phase glucose-oxidase package that has the advantages of room temperature processing and direct liquid encapsulation of a small volume solution without use of conventional solidifying chemicals.
On the Convergence of Observed Partial Likelihood under Incomplete Data with Two Class Possibilities  [PDF]
Tomoyuki Sugimoto
Open Journal of Statistics (OJS) , 2014, DOI: 10.4236/ojs.2014.42012
Abstract:

In this paper, we discuss the theoretical validity of the observed partial likelihood (OPL) constructed in a Coxtype model under incomplete data with two class possibilities, such as missing binary covariates, a cure-mixture model or doubly censored data. A main result is establishing the asymptotic convergence of the OPL. To reach this result, as it is difficult to apply some standard tools in the survival analysis, we develop tools for weak convergence based on partial-sum processes. The result of the asymptotic convergence shown here indicates that a suitable order of the number of Monte Carlo trials is less than the square of the sample size. In addition, using numerical examples, we investigate how the asymptotic properties discussed here behave in a finite sample.

A New Omics Data Resource of Pleurocybella porrigens for Gene Discovery
Tomohiro Suzuki, Kaori Igarashi, Hideo Dohra, Takumi Someya, Tomoyuki Takano, Kiyonori Harada, Saori Omae, Hirofumi Hirai, Kentaro Yano, Hirokazu Kawagishi
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0069681
Abstract: Background Pleurocybella porrigens is a mushroom-forming fungus, which has been consumed as a traditional food in Japan. In 2004, 55 people were poisoned by eating the mushroom and 17 people among them died of acute encephalopathy. Since then, the Japanese government has been alerting Japanese people to take precautions against eating the P. porrigens mushroom. Unfortunately, despite efforts, the molecular mechanism of the encephalopathy remains elusive. The genome and transcriptome sequence data of P. porrigens and the related species, however, are not stored in the public database. To gain the omics data in P. porrigens, we sequenced genome and transcriptome of its fruiting bodies and mycelia by next generation sequencing. Methodology/Principal Findings Short read sequences of genomic DNAs and mRNAs in P. porrigens were generated by Illumina Genome Analyzer. Genome short reads were de novo assembled into scaffolds using Velvet. Comparisons of genome signatures among Agaricales showed that P. porrigens has a unique genome signature. Transcriptome sequences were assembled into contigs (unigenes). Biological functions of unigenes were predicted by Gene Ontology and KEGG pathway analyses. The majority of unigenes would be novel genes without significant counterparts in the public omics databases. Conclusions Functional analyses of unigenes present the existence of numerous novel genes in the basidiomycetes division. The results mean that the omics information such as genome, transcriptome and metabolome in basidiomycetes is short in the current databases. The large-scale omics information on P. porrigens, provided from this research, will give a new data resource for gene discovery in basidiomycetes.
Synthesis and physical properties of Ca1-xRExFeAs2 with RE = La ~ Gd
Alberto Sala,Hiroyuki Yakita,Hiraku Ogino,Tomoyuki Okada,Akiyasu Yamamoto,Kohji Kishio,Shigeyuki Ishida,Akira Iyo,Hiroshi Eisaki,Masaya Fujioka,Yoshihiko Takano,Marina Putti,Jun-ichi Shimoyama
Physics , 2014, DOI: 10.7567/APEX.7.073102
Abstract: Synthesis of a series of layered iron arsenides Ca1-xRExFeAs2 (112) was attempted by heating at 1000 C under a high-pressure of 2 GPa. The 112 phase successfully forms with RE = La, Ce, Nd, Sm, Eu and Gd, while Tb, Dy and Ho substituted and RE free samples does not contain the 112 phase. The Ce, Nd, Sm, Eu and Gd doped Ca1-xRExFeAs2 are new compounds. All of them exhibit superconducting transition except for the Ce doped sample. The behaviour of the critical temperature, with the RE ionic radii have been investigated.
K"ahlerian submersions with vanishing Bochner curvature tensor
Kazuhiko Takano
Tamkang Journal of Mathematics , 2000, DOI: 10.5556/j.tkjm.31.2000.21-32
Abstract: In this paper, we discuss the K"ahlerian submersion with vanishing Bochner curvature tensor and prove that the Bochner curvature tensor of the base space vanishes. Also, we seek a sufficient condition with respect to the length of the Ricci tensor of each fiber that the Bochner curvature tensor of each fiber vanishes.
On the integrability of a K-conformal killing equation in a Kaehlerian manifold
Kazuhiko Takano
International Journal of Mathematics and Mathematical Sciences , 1991, DOI: 10.1155/s0161171291000716
Abstract: We show that necessary and sufficient condition in order that K- conformal Killing equation is completely integrable is that the Kaehlerian manifold K2m(m>2) is of constant holomorphic sectional curvature.
Foreword: Focus on Superconductivity in Semiconductors
Yoshihiko Takano
Science and Technology of Advanced Materials , 2008,
Abstract: Since the discovery of superconductivity in diamond, much attention has been given to the issue of superconductivity in semiconductors. Because diamond has a large band gap of 5.5 eV, it is called a wide-gap semiconductor. Upon heavy boron doping over 3×1020 cm 3, diamond becomes metallic and demonstrates superconductivity at temperatures below 11.4 K. This discovery implies that a semiconductor can become a superconductor upon carrier doping. Recently, superconductivity was also discovered in boron-doped silicon and SiC semiconductors. The number of superconducting semiconductors has increased. In 2008 an Fe-based superconductor was discovered in a research project on carrier doping in a LaCuSeO wide-gap semiconductor. This discovery enhanced research activities in the field of superconductivity, where many scientists place particular importance on superconductivity in semiconductors.This focus issue features a variety of topics on superconductivity in semiconductors selected from the 2nd International Workshop on Superconductivity in Diamond and Related Materials (IWSDRM2008), which was held at the National Institute for Materials Science (NIMS), Tsukuba, Japan in July 2008. The 1st workshop was held in 2005 and was published as a special issue in Science and Technology of Advanced Materials (STAM) in 2006 (Takano 2006 Sci. Technol. Adv. Mater. 7 S1.The selection of papers describe many important experimental and theoretical studies on superconductivity in semiconductors. Topics on boron-doped diamond include isotope effects (Ekimov et al) and the detailed structure of boron sites, and the relation between superconductivity and disorder induced by boron doping. Regarding other semiconductors, the superconducting properties of silicon and SiC (Kriener et al, Muranaka et al and Yanase et al) are discussed, and In2O3 (Makise et al) is presented as a new superconducting semiconductor. Iron-based superconductors are presented as a new series of high-TC superconductors (Tamegai et al), and the mechanism of superconductivity is discussed. Last but not least, a novel highest-density phase of boron is produced and characterized (Zarechnaya et al).We hope that this focus issue will help readers to understand the frontiers of superconductivity in semiconductors and assist in the application of new devices using a combination of superconductivity and semiconductivity.
Very Large-Scale Integrated Processor
Shigeyuki Takano
International Journal of Networking and Computing , 2013,
Abstract: In the near future, improvements in semiconductor technology will allow thousands of resources to be implementable on chip. However, a limitation remains for both single large-scale processors and many-core processors. For single processors, this limitation arises from their design complexity, and regarding the many-core processors, an application is partitioned to several tasks and these partitioned tasks are mapped onto the cores. In this article, we propose a dynamic chip multiprocessor (CMP) model that consists of simple modules (realizing a low design complexity) and does not require the application partitioning since the scale of the processor is dynamically variable, looking like up or down scale on demand. This model is based on prior work on adaptive processors that can gather and release resources on chip to dynamically form a processor. The adaptive processor takes a linear topology that realizes a locality based placement and replacement using processing elements themselves through a stack shift of information on the linear topology of the processing element array. Therefore, for the scaling of the processor, a linear topology of the interconnection network has to support the stack shift before and after the up- or down-scaling. Therefore, we propose an interconnection network architecture called a dynamic channel segmentation distribution (dynamic CSD) network. In addition the linear topology must be folded on-chip into two-dimensional plane. We also propose a new conceptual topology and its cluster which is a unit of the new topology and is replicated on the chip. We analyzed the cost in terms of the available number of clusters (adaptive processors with a minimum scale) and delay in Manhattan-distance of the chip, as well as its peak Giga-Operations per Second (GOPS) across the process technology scaling.
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