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Clearance Control Using Electromagnetic Damper over Uneven Road
Misaki Suruga,Takuya Hara,Ryota Takagi,Taichi Shiiba 대한기계학회 2015 대한기계학회 춘추학술대회 Vol.춘계 No.-
A trailer equipped with a prove radar is used to examine cavities which exist underneath asphalt pavement. The radar is required to secure the clearance to the road surface. However, when the spring rate of the suspension is set high to prevent the collision to the road surface, the vertical acceleration caused by uneven road is increased. It causes the breakdown of the radar. In this study, the electromagnetic damper utilizing the torque of DC motor as the damping force realizes various damping characteristics. The vertical acceleration and the clearance between the trailer and the road surface were evaluated by experiments with changing the damping characteristics of the electromagnetic damper.
Misaki Hanaoka,HIDEHIRO KANEDA,SHINKI OYABU,Yasuki Hattori,Kotomi Tanaka,Sota Ukai,Kazuyuki Shichi,Takehiko Wada,Toyoaki Suzuki,Kentaroh Watanabe,Koichi Nagase,Shunsuke Baba,Chihiro Kochi 한국천문학회 2017 天文學論叢 Vol.32 No.1
To realize large-format compact array detectors covering a wide far-infrared wavelength range up to 200 $\mu$m, we have been developing Blocked-Impurity-Band (BIB) type Ge detectors with the room-temperature surface-activated wafer bonding technology provided by Mitsubishi Heavy Industries. We fabricated various types of $p^+$-$i$ junction devices which possessed a BIB-type structure, and evaluated their spectral response curves using a Fourier transform spectrometer. From the Hall effect measurement, we also obtained the physical characteristics of the $p^+$ layers which constituted the $p^+$-$i$ junction devices. The overall result of our measurement shows that the $p^+$-$i$ junction devices have a promising applicability as a new far-infrared detector to cover a wavelength range of 100--200 μm.
Expansion of an invasive species, Ailanthus altissima, at a regional scale in Japan
Chuman, Misaki,Kurokochi, Hiroyuki,Saito, Yoko,Ide, Yuji The Ecological Society of Korea 2015 Journal of Ecology and Environment Vol.38 No.1
Ailanthus altissima, which is recognized as an invasive tree in the Western world, has been widely observed in Japan. To investigate how A. altissima expanded within-population and to new populations within a region, 446 A. altissima trees were sampled from three separate sites (A, B, and C) including 35 distantly positioned patches, with three chloroplast DNA markers and nine nuclear microsatellite markers. We detected 2, 2, and 3 chloroplast haplotypes in sites A, B, and C, respectively. In addition, 271, 40, and 41 nuclear genotypes were detected in sites A, B, and C, respectively. The clonal richness value was 0.85, 0.78, and 0.53 in sites A, B, and C, respectively. Most trees with the same genotypes were distributed in the same patch, indicating that range expansion by asexual reproduction was limited to a maximum of 45 meters. According to autocorrelation analysis, the extent of nonrandom spatial genetic structure was approximately 0-2 km in sites A and C. KINGROUP analyses showed that 812, 74, and 111 nuclear genotype pairs were detected to have kinship in sites A, B, and C, respectively. Most nuclear genotype pairs were detected within the same patches or sites. These results indicate that the number of A. altissima trees gradually increased from seeds, some of which were produced by trees within sites, meaning that this species could regenerate naturally. This shows the need for the future management of A. altissima as an invasive species in Japan.
Synthesis and properties of higher homologs of extended TTP donors
Y. Misaki,A. Kubo,W. Matsuda,H. Fueno,K. Tanaka 한국물리학회 2006 Current Applied Physics Vol.6 No.5
A series of multi-fused extended tetrathiafulvalene (TTF), in which thiophene ring is inserted between two 1,3-dithiole rings inTTF (ThTTF-n,n = 35,7), have been synthesized. In the electronic spectra, no signicant red shift bas been observed as the num-ber of fused extended TTFs increases. Cyclic voltammograms of the ThTTF-n are composed ofn . 2 pairs of two-electron transferwaves and two pair of one-electron-transfer ones, while four pairs of single-electron-transfer waves have been observed for ThTTF-2. Molecular orbital calculation suggests the highest occupied molecular orbitals (HOMOs) of ThTTF-n spread over the molecule,while the lowest unoccupied molecular orbitals (LUMOs) are localized on the central thiophene moieties.
Projection mapping onto multiple objects using a projector robot
Yamazoe, Hirotake,Kasetani, Misaki,Noguchi, Tomonobu,Lee, Joo-Ho Techno-Press 2018 Advances in robotics research Vol.2 No.1
Even though the popularity of projection mapping continues to increase and it is being implemented in more and more settings, most current projection mapping systems are limited to special purposes, such as outdoor events, live theater and musical performances. This lack of versatility arises from the large number of projectors needed and their proper calibration. Furthermore, we cannot change the positions and poses of projectors, or their projection targets, after the projectors have been calibrated. To overcome these problems, we propose a projection mapping method using a projector robot that can perform projection mapping in more general or ubiquitous situations, such as shopping malls. We can estimate a projector's position and pose with the robot's self-localization sensors, but the accuracy of this approach remains inadequate for projection mapping. Consequently, the proposed method solves this problem by combining self-localization by robot sensors with position and pose estimation of projection targets based on a 3D model. We first obtain the projection target's 3D model and then use it to accurately estimate the target's position and pose and thus achieve accurate projection mapping with a projector robot. In addition, our proposed method performs accurate projection mapping even after a projection target has been moved, which often occur in shopping malls. In this paper, we employ Ubiquitous Display (UD), which we are researching as a projector robot, to experimentally evaluate the effectiveness of the proposed method.
Jun-ichi Suto,Misaki Kojima 아세아·태평양축산학회 2019 Animal Bioscience Vol.32 No.12
Objective: Testicular growth and development are strongly influenced by androgen. Although both testis weight and plasma testosterone level are inherited traits, the interrelationship between them is not fully established. Males of DDD/Sgn (DDD) mice are known to have extremely heavy testes and very high plasma testosterone level among inbred mouse strains. We dissected the genetic basis of testis weight and analyzed the potential influence of plasma testosterone level in DDD mice. Methods: Quantitative trait loci (QTL) mapping of testis weight was performed with or without considering the influence of plasma testosterone level in reciprocal F2 intercross populations between DDD and C57BL/6J (B6) mice, thereby assessing the influence of testosterone on the effect of testis weight QTL. Candidate genes for testis weight QTL were investigated by next-generation sequencing analysis. Results: Four significant QTL were identified on chromosomes 1, 8, 14, and 17. The DDD-derived allele was associated with increased testis weight. The F2 mice were then divided into two groups according to the plasma testosterone level (F2 mice with relatively “low” and “high” testosterone levels), and QTL scans were again performed. Although QTL on chromosome 1 was shared in both F2 mice, QTL on chromosomes 8 and 17 were identified specifically in F2 mice with relatively high testosterone levels. By whole-exome sequencing analysis, we identified one DDD-specific missense mutation Pro29Ser in alpha tubulin acetyltransferase 1 (Atat1). Conclusion: Most of the testis weight QTL expressed stronger phenotypic effect when they were placed on circumstance with high testosterone level. High testosterone influenced the QTL by enhancing the effect of DDD-derived allele and diminishing the effects of B6-derived allele. Since Pro29Ser was not identified in other inbred mouse strains, and since Pro29 in Atat1 has been strongly conserved among mammalian species, Atat1 is a plausible candidate for testis weight QTL on chromosome 17.