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A RTL-Library Mapping Algorithm for Sub-Micron ASIC Synthesis
Moshnyaga, V.,Mori, Y.,Tamaru, K. 대한전자공학회 1993 ICVC : International Conference on VLSI and CAD Vol.3 No.1
This paper presents a navel library mapping algorithm far register-transfer synthesis of high-speed Application-Specific Integrated Circuits. The algorithm not only efficiently exploits the multiple module implementations in the design library, but also finds the performance-driven module placement which minimizes wiring delay. Experimental results show that considering both module and wiring issues, more than 20% improvement in design performance car be achived.
Hideki Hagiwara,Ruri Shoji,Hitoi Tamaru,Shun Liu,Tadashi Okano 한국항해항만학회 2006 한국항해항만학회 학술대회논문집 Vol.1 No.-
Accurate vessel traffic observation is indispensable to carry out vessel traffic management, design of vessel traffic route, planning of port construction, etc. In order to observe the vessel traffic accurately without many efforts such as the use of a ship or car equipped with special radar observation system and the preparation of observation staff, the authors have been developing completely automated remote radar/AIS network system covering the main traffic area in Tokyo Bay. The composite radar image observed at Yokosuka and Kawasaki radar stations with AIS information can be seen on web site of Internet. In addition to the development of radar/AIS observation system, the software to analyze observed vessel traffic flow has been developed. This software has various functions such as automatic tracking of ship’s positions, automatic estimation of ship’s size, automatic integration of radar image and AIS data, animation of ships’ movements, extraction of dangerous ship encounters, etc. The configuration and functions of the developed remote radar/AIS network system are shown first in this paper. Then various functions of the software to analyze vessel traffic are introduced, and some analyzed results on the vessel traffic in Tokyo Bay are described demonstrating the effectiveness of the developed system.
Spin-wave eigenmodes in single disk-shaped FeB nanomagnet
Cho, Jaehun,Miwa, Shinji,Yakushiji, Kay,Tamaru, Shingo,Kubota, Hitoshi,Fukushima, Akio,Fujimoto, Satoshi,Tamura, Eiiti,You, Chun-Yeol,Yuasa, Shinji,Suzuki, Yoshishige American Physical Society 2016 Physical Review B Vol.94 No.18
<P>Spin-wave eigenmodes in a disk-shaped FeB nanomagnet were investigated using magnetic tunnel junctions with a FeB magnetic layer and MgO barrier. Noise spectrum measurements for a perpendicularly magnetized junction of 120 nm in diameter showed thermal excitation of distinct spin-wave modes. The measured spectra were compared with analytical calculations and numerical simulations. As a result, the observed modes were classified as spin-wave eigenmodes with various nodal circles and nodal diameter modes by taking into account splitting between directional spin-wave modes originating from dynamic dipolar interaction instead of Dzyaloshinskii-Moriya interaction. These results provide a fundamental understanding of spin dynamics in nanosize spintronic devices.</P>
Realizations of some contact metric manifolds as Ricci soliton real hypersurfaces
Cho, Jong Taek,Hashinaga, Takahiro,Kubo, Akira,Taketomi, Yuichiro,Tamaru, Hiroshi Elsevier 2018 Journal of geometry and physics Vol.123 No.-
<P><B>Abstract</B></P> <P>Ricci soliton contact metric manifolds with certain nullity conditions have recently been studied by Ghosh and Sharma. Whereas the gradient case is well-understood, they provided a list of candidates for the nongradient case. These candidates can be realized as Lie groups, but one only knows the structures of the underlying Lie algebras, which are hard to be analyzed apart from the three-dimensional case. In this paper, we study these Lie groups with dimension greater than three, and prove that the connected, simply-connected, and complete ones can be realized as homogeneous real hypersurfaces in noncompact real two-plane Grassmannians. These realizations enable us to prove, in a Lie-theoretic way, that all of them are actually Ricci soliton.</P>
Function of the DEMETER DNA glycosylase in the Arabidopsis thaliana male gametophyte.
Schoft, Vera K,Chumak, Nina,Choi, Yeonhee,Hannon, Mike,Garcia-Aguilar, Marcelina,Machlicova, Adriana,Slusarz, Lucyna,Mosiolek, Magdalena,Park, Jin-Sup,Park, Guen Tae,Fischer, Robert L,Tamaru, Hisashi National Academy of Sciences 2011 PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF Vol.108 No.19
<P>In double fertilization, the vegetative cell of the male gametophyte (pollen) germinates and forms a pollen tube that brings to the female gametophyte two sperm cells that fertilize the egg and central cell to form the embryo and endosperm, respectively. The 5-methylcytosine DNA glycosylase DEMETER (DME), expressed in the central cell, is required for maternal allele demethylation and gene imprinting in the endosperm. By contrast, little is known about the function of DME in the male gametophyte. Here we show that reduced transmission of the paternal mutant dme allele in certain ecotypes reflects, at least in part, defective pollen germination. DME RNA is detected in pollen, but not in isolated sperm cells, suggesting that DME is expressed in the vegetative cell. Bisulfite sequencing experiments show that imprinted genes (MEA and FWA) and a repetitive element (Mu1a) are hypomethylated in the vegetative cell genome compared with the sperm genome, which is a process that requires DME. Moreover, we show that MEA and FWA RNA are detectable in pollen, but not in isolated sperm cells, suggesting that their expression occurs primarily in the vegetative cell. These results suggest that DME is active and demethylates similar genes and transposons in the genomes of the vegetative and central cells in the male and female gametophytes, respectively. Although the genome of the vegetative cell does not participate in double fertilization, its DME-mediated demethylation is important for male fertility and may contribute to the reconfiguration of the methylation landscape that occurs in the vegetative cell genome.</P>