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31.
Dynamic Characteristics Analysis of Two‐DOF Oscillatory Actuator and Experimental Verification of Prototype
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Yoshimoto Takamichi Katsuhiro Hirata Yasuyoshi Asai Kenji Ueyama Eiichiro Hashimoto Takahiro Takagi 《Electrical Engineering in Japan》2014,186(1):58-65
Recently, linear oscillatory actuators have been used in a wide range of applications. In particular, small linear oscillatory actuators are expected to be used in haptic devices by being extended to provide multi‐degree‐of‐freedom motion with arbitrary acceleration. In this paper, we propose a compact two‐DOF oscillatory actuator that can move in various directions on a plane. The static and dynamic characteristics of the actuator are determined by the 3D finite element method. The effectiveness of this method is shown through a comparison of the measured results with the experimental results from a prototype. © 2013 Wiley Periodicals, Inc. Electr Eng Jpn, 186(1): 58–65, 2014; Published online in Wiley Online Library ( wileyonlinelibrary.com ). DOI 10.1002/eej.22312 相似文献
32.
Hideomi Koinuma Min-Sung Kim Toshiaki Asakawa Mamoru Yoshimoto 《Fullerenes, Nanotubes and Carbon Nanostructures》2013,21(3):599-612
Abstract Several new processes have been developed for the preparation of fullerenes and thin films by using a pulsed excimer laser. The irradiation of a pulsed KrF excimer laser beam onto a C60 powder target produced single phase C60 thin films when the laser energy fluence was in the range between 40 and 50mJ/cm2. By atomic force microscopy, the laser-deposited C60 thin film was verified to have a surface far smoother that the surfaces of films produced by the conventional evaporation method. The stainless steel rods coated with this film exhibited an excellent tribological property. Cluster formation from SiC and other carbides MCn(M=Ti,W,B) was investigated by laser desorption time-of-flight mass spectrometry. No clear indication was observed for the production of such clusters as (SiC)60 and (MxC60-x) from the sintered targets directly as well as from the films laser deposited from the targets. However, C60 and C70 were found to exists in the laser-deposited films, indicating a new applicability of pulsed laser processing for segregative cluster synthesis from solid solution. Preliminiary results on thin film deposition via pulsed ablation of (Ba,Na)xSi46 clathrate were also presented. 相似文献
33.
Yoshino M. Kaneko S. Taniguchi T. Miki N. Kumozaki K. Imai T. Yoshimoto N. Tsubokawa M. 《Lightwave Technology, Journal of》2008,26(8):962-970
In order to relax the limitation of the number of multiplexed signal lights caused by beat noise between signal lights, we investigate the applicability of a heterodyne detection technique to a spectral amplitude coding optical code division multiple access scheme. In this investigation, for the first time, we found analytically that the optical frequency chips that form parts of the signal and local lights require uniform phase differences even for envelope detection. We also confirm this requirement and our theoretical analysis experimentally. 相似文献
34.
Fujiwara H. Nii K. Noguchi H. Miyakoshi J. Murachi Y. Morita Y. Kawaguchi H. Yoshimoto M. 《Very Large Scale Integration (VLSI) Systems, IEEE Transactions on》2008,16(6):620-627
We propose a low-power two-port SRAM for real-time video processing that exploits statistical similarity in images. To minimize the discharge power on a read bitline, a majority-logic circuit decides if input data should be inverted in a write cycle, so that ldquo1rdquos are in the majority. In addition, for further power reduction, write-in data are reordered into digit groups from the most significant bit group to the least significant bit group. The measurement result of a 68-kbit video memory in a 90-nm process demonstrates that a 45% power saving is achieved on the read bitline. The speed and area overheads are 4% and 7%, respectively. 相似文献
35.
Kohtoku M. Kawano K. Sekine S. Takeuchi H. Yoshimoto N. Wada M. Ito T. Yanagibashi M. Kondo S. Noguchi Y. Naganuma M. 《Lightwave Technology, Journal of》2000,18(3):360-369
Fully packaged 2×2 and 4×4 semiconductor optical switch modules are successfully developed by integrating spotsize converters (SSCs) consisting of lateral tapers, thin-film cores, and ridges in InGaAlAs-InAlAs multiple quantum-well (MQW) directional coupler waveguide switches in the 1.55-μm wavelength region. Good reproducibility is obtained for the perfect coupling length of the directional coupler by appropriately designing the ridge width and gap of strip-loaded optical waveguides and by making use of the Cl2 reactive-ion-beam-etching and successive wet-etching. Since the switching time is sufficiently short (<70 ps, which is limited by the driver speed) for the 4×4 switch module, no bits are lost during a 10-Gb/s switching experiment at a wavelength of 1.55 μm 相似文献
36.
37.
K. Enomoto T. Hasebe R. Asakawa A. Kamijo Y. Yoshimoto T. Suzuki K. Takahashi A. Hotta 《Diamond and Related Materials》2010,19(7-9):806-813
During the past year, we have witnessed the evolution of an intense public controversy regarding late thrombosis following implantation of drug eluting stent (DES) in patients with obstructive coronary artery disease. To overcome the problem, DES should possess sufficient biocompatibility and non-thrombogenicity with a controlled drug release system. A new DES composed of biocompatible polymers coated with antithrombogenic diamond-like carbon (DLC) coating was proposed. In this study, the drug release profile of the newly proposed drug eluting system was thoroughly investigated. Three polymers were selected as base drug-reservoir materials: hydrophilic 2-methacryloyloxyethyl phosphorylcholine (MPC), hydrophobic poly (ethylene-co-vinyl acetate) (EVA) and less hydrophobic polyurethane (PU). The three polymers are currently used or studied for biomedical materials, while MPC and DLC were already confirmed as excellent biocompatible materials with antithrombogenicity. After coating the lattice-like patterned DLC on both polymers containing drug, samples were soaked in 2 ml of medium of phosphate-buffered saline with 10% ethanol. The drug release rate was measured by a spectrophotometer. The percentile cover area of patterned DLC on polymers was varied from 0% (without DLC) to 100% (fully covered). The sample without DLC coating presented an initial burst of the drug release from the polymer matrix, whereas the DLC-coated samples inhibited the initial burst release from polymers within the first five days of the experiments. It was found that the drug eluting profiles could be effectively controlled by changing the cover area of micro-patterned DLC coatings on polymers, which may be applicable to the next-generation DES system that eventually prevents late thrombosis. 相似文献
38.
A Arai M Naruse K Naruse A Tanabe T Yoshimoto T Iwama K Kusakabe T Obara R Demura H Demura 《Canadian Metallurgical Quarterly》1998,37(11):940-944
A patient with malignant cardiac pheochromocytoma with bone metastases is described. The primary tumor was located between the pulmonary trunk and the left atrium, while metastatic lesions were found in the iliac bones. Treatments with antihypertensive agents, alpha-methylparatyrosine, and combination chemotherapy with cyclophosphamide, vincristine, and dacarbazine partially improved the patient's symptoms, catecholamine levels, and the metastatic lesion of the iliac bones. However, the primary tumor in the heart progressively increased in size and the patient died of disseminated intravascular coagulation and other various complications about 4 years after the diagnosis of the disease. 相似文献
39.
40.
Yoshimoto N. Shibata Y. Oku S. Kondo S. Noguchi Y. 《Photonics Technology Letters, IEEE》1998,10(4):531-533
We propose that a polarization-insensitive Mach-Zehnder interferometer (MZI) switch is useful for optical gate elements, especially if multiwavelength signals are input. This device has high-input-power saturation properties, which shows that both the operating voltage and the extinction ratio do not change when the optical input power reaches at least +18 dBm. A high extinction ratio of 30 dB was achieved in the wide-wavelength range of 20 nm. Moreover, the extinction ratio can be improved by up to 45 dB by using a cascaded configuration to decrease crosstalk. These results indicate the MZI gate switch is well suited to wavelength-division multiplexing (WDM) network components 相似文献