作者：
Shigehiko YumuraTaro Q.P. UyedaDepartment of Biology
Faculty of Science Yamaguchi University Yamaguchi Japan Bionic Design Group
National Institute for Advanced Interdisciplinary Research and Mechanical Engineering Laboratory Agency for Industrial Science and Technology Tsukuba Ibaraki Japan
To elucidate the role of phosphorylation in regulation of intracellular distribution of myosin II, we have characterized mutant Dictyostelium cells expressing myosin II that could not be regulated by the phosphorylati...
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Electrophoretic analyses of acid extracts from mature sperm of newt, Cynops pyrrhogaster, on acid/urea/Triton X-100 polyacrylamide gel showed the exclusive occurrence of sperm-specific nuclear basic proteins (SBPs), w...
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The parameter estimation problem of point spread function is one of the most challenging and important task for image restoration. A new method for the parameter estimation in the case of motion blur is presented here...
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The parameter estimation problem of point spread function is one of the most challenging and important task for image restoration. A new method for the parameter estimation in the case of motion blur is presented here. II is based on the principle that the power spectrum of the motion blurred image contains periodical minima relevant directly to the motion direction and length. Though the principle is very simple and effective in certain cases, the direct use of it may lead to poor performance as the signal-to-noise ratio (SNR) gets lower. To improve the estimation accuracy, by analyzing image noise effect on the detection of the minima, we propose a method to greatly reduce spectral noise, and give the lowest allowed SNR at which the minima may still be identified reliably. We also estimate the power spectrum of the original image, which is a must for the Wiener restoration filler, from the noisy blurred image based on a noncasual autoregressive model. Once above parameters are decided, the Wiener filter is used to restore the noisy blurred image. Our method is very practical;no parameter needs to be known a priori, or to be adjusted manually to fit into various application problems. The proposed method is finally applied to synthesized and real motion blurred images to demonstrate its effectiveness.
ZnSe films were grown on GaAs(1 1 1)B substrates by molecular beam epitaxy. The observation of reflection high-energy electron diffraction confirmed that the epilayers on both just and 10(2)-misoriented (1 1 1)B subst...
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ZnSe films were grown on GaAs(1 1 1)B substrates by molecular beam epitaxy. The observation of reflection high-energy electron diffraction confirmed that the epilayers on both just and 10(2)-misoriented (1 1 1)B substrates consist of twins. The photoluminescence of the undoped epilayers showed defect-related Y-line emissions and deep emissions owing to the twins. Nitrogen was doped to the epilayers using an RF plasma cell. The photoluminescence spectra of the doped epilayers suggested that the nitrogen doping to ZnSe is enhanced using the GaAs(1 1 1)B substrates instead of the GaAs(1 0 0) substrates. We discussed the reason based on the bond number of the growing surface.
This paper presents a new upper bound on overall bit error rate (BER) for a concatenated code which consists of an inner convolutional code and an outer interleaved Reed-Solomon code. The upper bound on BER is derived...
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This paper presents a new upper bound on overall bit error rate (BER) for a concatenated code which consists of an inner convolutional code and an outer interleaved Reed-Solomon code. The upper bound on BER is derived based on a lower bound on the effective minimum distance of the concatenated code. This upper bound can be used for the cases when the interleaver size is small such that the conventional upper bound is not applicable.
In this paper, we propose an order reduction method of controller based on combination of the alternating projection method and the balanced truncation. In this method both the errors of controller and the closed-loop...
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ZnSe(111) films grown on GaAs(111)A substrates were studied by X-ray diffraction measurement. The [111] axis of ZnSe epilayers was tilted toward the [100] direction when the aims were grown on 5 degrees- and 10 degree...
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ZnSe(111) films grown on GaAs(111)A substrates were studied by X-ray diffraction measurement. The [111] axis of ZnSe epilayers was tilted toward the [100] direction when the aims were grown on 5 degrees- and 10 degrees-misoriented substrates toward the [100] direction, However, such tilting was not, observed in the epilayers grown on just-oriented substrates. The lattice spacing dirt of the epilayers mas measured and the lattice deformation and relaxation were studied.
Semiconducting SiC is expected for power devices and higher breakdown voltage of the device is required. Growth rate of epilayer by conventional CVD is about 3 μm/h. To make a thick epilayer, more than 10 hours are n...
Semiconducting SiC is expected for power devices and higher breakdown voltage of the device is required. Growth rate of epilayer by conventional CVD is about 3 μm/h. To make a thick epilayer, more than 10 hours are needed. To minimize the growth time, we propose sublimation epitaxial method by close space technique (CST). In the CST, source ( polycrystalline 3C-SiC plate) and substrate is closely separated by spacer and source material is sublimed and transferred to the substrate in argon. Epitaxial layers with specular surface were obtained on 6H-SiC substrates at a substrate temperature around 2200 °C and growth rate was about 100 μ/h. Nitrogen-bound exciton was observed by PL measurement at 2 K in the epilayer when 3C-SiC plate with high purity was employed as the source material. Crystallinity of the epilayer was characterized by Raman spectroscopy.
To obtain a clearer ultrasonic diagnostic image using a microbubble contrast agent, investigation of power scattering from microbubbles is indispensable. The scattered power from the microbubbles should be as large as...
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To obtain a clearer ultrasonic diagnostic image using a microbubble contrast agent, investigation of power scattering from microbubbles is indispensable. The scattered power from the microbubbles should be as large as possible, and, since it depends largely on the elasticity of the microbubble shells, it is desirable to have as large an elasticity as possible. However, microbubbles with weak shells are easily broken under high pressure. Although hard-shell microbubbles are effective under high pressure, these microbubbles do not consistently produce scattered power. Thus, it is very important to fabricate microbubbles that can be used as ultrasound contrast agents. In this study, the effect of pressure on the scattered power and longevity of microbubbles in a blood vessel model was investigated using a blood vessel model system. Microbubbles coated with sodium laurate were compared with hollow silicone microcapsules (Grandoll) which have a different shell type. The effect of the pressure in the blood vessel model on these microbubbles was investigated by ultrasound scattered power measurement. According to the results, the scattered power from the sodium laurate microbubbles decreases when the pressure increases because of the disappearance of microbubbles. In contrast, the effect of pressure on scattered power from hard-shell microbubbles is negligible.
A new type of optical actuator is proposed by using the bimetal( Ni-Cr-Fe/36Ni-Fe ), which is to be developed for a optical micro-mechatronics system. The paper describes fundamental characteristics on a larger actuat...
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A new type of optical actuator is proposed by using the bimetal( Ni-Cr-Fe/36Ni-Fe ), which is to be developed for a optical micro-mechatronics system. The paper describes fundamental characteristics on a larger actuator both theoretically and experimentally. In order to identify some unknown parameters of the actuator, the results simulated by FEM are presented, and are compared with the experimental data. Furthermore, a numerical experiment on the optical micro-actuator is carried out to analyze step characteristic by FEM. Finally, the development of helical actuator is also provided.
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