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A Control System Design of a Single - Link Manipulator Using H<SUB>∞</SUB> Control Theory
Yoichi SHIMOMOTO,Toshihiro KOBAYASHI,Takakazu ISHIMATSU 대한전자공학회 1992 대한전자공학회 학술대회 Vol.1992 No.10
This paper is concerned with a control system design of a vertical type single-link manipulator. One designing method using H∞ control theory, which considers effects of gravity in a design specification, is proposed. In our design method we regard effects of gravity on dynamics of the manipulator as a disturbance at plant input. We consider reducing the H∞-norm of a transfer function from this disturbance to plant output as much as possible in order to reject effects of gravity. A numerical result shows that our design method achieves better tracking performance than the mixed sensitivity method which is a conventional method when H∞ control theory is applied to a control system design.
Longitudinal Magnetoresistance of Ce(Cu1−xNix)2Si2
Yoichi Ikeda,Shingo Araki,Tatsuo C. Kobayashi 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.63 No.3
The longitudinal magnetoresistance (LMR) of polycrystalline Ce(Cu1−xNix)2Si2 samples is investigatedbetween T = 2 and 15 K up to H = 80 kOe. The application of magnetic field inducesanomalous temperature dependence of the resistivity with the power index n < 2 for x = 0.12and 0.14, in which ρ(T) obeys a T2-law at H = 0 Oe. A sign-change of the LMR from positive(x < 0.03) to negative (x > 0.03) is observed at 2 K. The negative LMR at 80 kOe is maximized(~ −4 % at T = 2 K) around x ~ 0.10 and subsequently disappears at higher Ni concentrations. Disappearance of the positive LMR in lower x region and the negative LMR at higher Ni concentrationsimplies a collapse of a coherent Kondo lattice state, and a rapid enhancement of Kondotemperature, respectively. Anomalous quantum fluctuations are probably developed around x ~ 0.10.
Real-space Imaging of Ferroelectric and Structural Antiphase Domains in Hexagonal YMnO<sub>3</sub>
Keisuke Kobayashi,Hideki Kamo,Kosuke Kurushima,Yoichi Horibe,정상욱,Yoshihiko Togawa,Shigeo Mori 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.7
A high-angle annular-dark-field (HAADF) imaging technique was applied to the investigation of domain wall structures in the ferroelectric phase of hexagonal manganites, YMnO<sub>3</sub>, on an atomic scale. The displacements of the Y<sup>3+</sup> ions along the [001] direction can be clearly visualized. The ferroelectric dipole moments are revealed to be caused by the opposite and unequal displacements of Y<sup>3+</sup> ions. Two types of domain walls should be identified in the ferroelectric domain structures. One is charged longitudinal domain walls with head-to-head or tail-to-tail configurations and the other is non-charged transverse domain walls with head-to-tail configurations. In addition, the ferroelectric and the structural antiphase domains in YMnO<sub>3</sub> change into fragmentary domains because of substitution of Ti<sup>4+</sup> for Mn<sup>3+</sup>, and ferroelectric nanodomains with sizes of 10 - 20 nm are found in the x = 0.30 compound.
Systematic time-dependent visualization and quantitation of the neurogenic rate in brain organoids
Kosodo, Yoichi,Suetsugu, Taeko,Kobayashi, Tetsuya J.,Matsuzaki, Fumio Elsevier 2017 Biochemical and biophysical research communication Vol. No.
<P><B>Abstract</B></P> <P>Organoids mimicking the formation of the brain cortex have been demonstrated to be powerful tools for developmental studies as well as pathological investigations of brain malformations. Here, we report an integrated approach for the quantification of temporal neural production (neurogenic rate) in organoids derived from embryonic brains. Spherical tissue fragments with polarized cytoarchitectures were incubated in multiple cavities arranged in a polymethylmethacrylate chip. The time-dependent neurogenic rate in the organoids was monitored by the level of EGFP under the promoter of <I>Tbr2</I>, a transcription factor that is transiently expressed in neural fate-committed progenitors during corticogenesis. Importantly, our monitoring system exhibited a quick response to DAPT, a drug that promotes neural differentiation. Furthermore, we successfully quantified the temporal neurogenic rate in a large number of organoids by applying image processing that semi-automatically recognized the positions of organoids and measured their signal intensities from sequential images. Taken together, we provide a strategy to quantitate the neurogenic rate in brain organoids in a time-dependent manner, which will also be a potent method for monitoring organoid formation and drug activity in other tissue types.</P> <P><B>Highlights</B></P> <P> <UL> <LI> We established a semi-automatic neurogenic activity assay system in brain organoids. </LI> <LI> Microcavity chips and image processing enabled the accurate scoring of fluorescence. </LI> <LI> The temporal response to a drug that potentiates neurogenesis was demonstrated. </LI> </UL> </P>
Age-Related Prevalence of Periodontoid Calcification and Its Associations with Acute Cervical Pain
Takashi Kobayashi,Naohisa Miyakoshi,Norikazu Konno,Yoshinori Ishikawa,Hideaki Noguchi,Yoichi Shimada 대한척추외과학회 2018 Asian Spine Journal Vol.12 No.6
Study Design: Prospective study. Purpose: To assess the prevalence of periodontoid calcification and its associations with acute cervical pain. Overview of Literature: Calcium pyrophosphate dihydrate (CPPD) deposition disease is a common rheumatological disorder that occurs especially in elderly patients. Although CPPD crystals induce acute arthritis, these crystals are not usually symptomatic. Calcification surrounding the odontoid process (periodontoid calcification) has been reported to induce inflammation, resulting in acute neck pain. This disease is called crowned dens syndrome. Whether calcification induces inflammation or whether the crystals are symptomatic remains unclear. Methods: The prevalence of periodontoid calcification at the atlas transverse ligament was examined by computed tomography of the upper cervical spine in patients suspected of brain disease but no cervical pain (control group, n=296), patients with pseudogout of the peripheral joints but no cervical pain (arthritis group, n=41), and patients with acute neck pain (neck pain group, n=22). Next, the correlation between the prevalence of periodontoid calcification and symptoms was analyzed. Results: In the control group, 40 patients (13.5%) showed periodontoid calcification with no significant difference in the prevalence with gender. The prevalence of calcification increased significantly with age (p =0.002). In the arthritis group, 26 patients (63.4%) reported periodontoid calcification. In the neck pain group, 14 patients (63.6%) reported periodontoid calcification. Multiple logistic regression analysis by age and group revealed that higher age, inclusion in the arthritis group, and inclusion in the neck pain group significantly affected the prevalence of calcification. Conclusions: Our results cumulatively suggest that periodontoid calcification is an aging-related reaction and that calcification per se does not always cause neck pain. Periodontoid calcification was observed more frequently in patients with pseudogout of the peripheral joints and in those with acute neck pain than in asymptomatic control patients.
Takanori Kitagawa,Yoichi Iizuka,Hiroki Kobayashi,Tokue Mieda,Daisuke Tsunoda,Atsushi Yamamoto,Tsuyoshi Tajika,Haku Iizuka,Kenji Takagishi 대한척추외과학회 2017 Asian Spine Journal Vol.11 No.6
Study Design: Cross-sectional study. Purpose: The purpose of this study was to evaluate the correlation between pelvic tilt (PT) and the sacro-femoral-pubic (SFP) angle, which is easier to identify than PT, in middle-aged and elderly Asian subjects from the general population. Overview of Literature: Measuring PT is important in the diagnosis and treatment of adult spinal deformity. However, identifying femoral heads, which are necessary to determine PT, using sagittal radiographs is often difficult. Methods: Standing coronal and sagittal pelvic radiographs of individuals aged more than 50 years were taken during a local medical examination. The subjects were divided into female, male, and total groups at the time of evaluation. Linear regression analysis was performed to investigate the relationship between PT and the SFP angle, which were obtained from the X-rays. Results: The present study included 291 subjects. There were no statistically significant differences between the left and right SFP angles, and there was gender difference regarding the SFP angle. However, a gender difference was observed regarding PT. The correlation between PT and the SFP angle was substantiated in each group. Pearson’s correlation coefficients between PT and the SFP angle in the total, female, and male groups were 0.696, 0.853, and 0.619, respectively. In the linear regression analysis, PT was calculated as follows: PT=60.1−0.77×(SFP angle) in the total group, PT=62.8−0.80×(SFP angle) in the female group, and PT=51.5−0.64×(SFP angle) in the male group. Conclusions: A significant correlation between PT and the SFP angle was observed in middle-aged and elderly Asian subjects from the general population.
LÜ,, JUNCHANG,AZUMA, YOICHI,DONG, ZHIMING,BARSBOLD, RINCHEN,KOBAYASHI, YOSHITSUGU,LEE, YUONG-NAM Cambridge University Press 2009 Geological magazine Vol.146 No.5
<B>Abstract</B><P>New material of dsungaripterid pterosaurs from the Early Cretaceous of Tatal, western Mongolia, allows the diagnoses of Dsungaripteridae and<I>Noripterus</I>to be amended. All pterosaurs found at Tatal belong to Dsungaripteridae (either<I>Dsungaripterus</I>or<I>Noripterus</I>). The name<I>Phobetor</I>is a junior synonym of<I>Noripterus</I>. The differing shapes of the anterior tips of skulls, differing tooth morphologies and the coexistence of both<I>Dsungaripterus</I>and<I>Noripterus</I>may imply that they occupied distinct ecological niches.</P>