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Yukio Katori,Jose Francisco Rodrí,guez-Vá,zquez,Samuel Verdugo-Ló,pez,Gen Murakami,Tetsuaki Kawase,Toshimitsu Kobayashi 대한해부학회 2012 Anatomy & Cell Biology Vol.45 No.3
Fetal development of the cartilage of the pharyngotympanic tube (PTT) is characterized by its late start. We examined semiserial histological sections of 20 human fetuses at 14-18 weeks of gestation. As controls, we also observed sections of 5 large fetuses at around 30 weeks. At and around 14 weeks, the tubal cartilage first appeared in the posterior side of the pharyngeal opening of the PTT. The levator veli palatini muscle used a mucosal fold containing the initial cartilage for its downward path to the palate. Moreover, the cartilage is a limited hard attachment for the muscle. Therefore, the PTT and its cartilage seemed to play a critical role in early development of levator veli muscle. In contrast, the cartilage developed so that it extended laterally, along a fascia-like structure that connected with the tensor tympani muscle. This muscle appeared to exert mechanical stress on the initial cartilage. The internal carotid artery was exposed to a loose tissue facing the tubal cartilage. In large fetuses, this loose tissue was occupied by an inferior extension of the temporal bone to cover the artery. This later-developing anterior wall of the carotid canal provided the final bony origin of the levator veli palatini muscle. The tubal cartilage seemed to determine the anterior and inferior margins of the canal. Consequently, the tubal cartilage development seemed to be accelerated by a surrounding muscle, and conversely, the cartilage was likely to determine the other muscular and bony structures.
Lattice Modulation in YMn2O5 and TbMn2O5 Studied by Using Synchrotron Radiation X-rays
Yukio Noda,H Kimura,H Sawa,K Kohn,N Ikeda,S Kobayashi,Y Ishikawa,Y Kamada,Y Wakabayashi 한국물리학회 2007 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.51 No.2I
RMn2O5 (R = Y and rare earth) shows successive magnetic and ferroelectric phase transitions at about 45 K, 40 K, 39 K, 20 K and 10 K and is called a multiferroic compound. We have investigated the lattice modulation vectors (qL) of YMn2O5 and TbMn2O5 by using single crystal Synchrotron Radiation X-ray diraction and compared them with the magnetic propagation vectors (qM) studied by neutron diraction. The relation of the propagation vectors between magnetic materials and dielectrics is found to be qL = 2qM. A preliminary structure analysis of the atomic displacement pattern in the commensurate ferroelectric phase of TbMn2O5 is discussed.fb
Satoru Kobayashi,Hiroyuki Kimura,Isao Kagomiya,Kay Kohn,Toshihiro Osawa,Yukio Noda 한국물리학회 2005 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.46 No.1
A ferroelectric phase transition of RMn2O5 (R = rare earth,Bi,Y) has been systematically reinvestigated by dielectric measurements. In addition to a sharp peak of the dielectric constant along the b axis at the temperature of ferroelectric phase transition, TC1, we observed a small kink at TS slightly below TC1 for R = Er, Y, Tb, Tm. Correspondingly, two-step successive magnetic phase transitions were found for R = Er, Y, Tm in a narrow temperature range of 1 K around TC1 by neutron diraction measurements. The comparison between temperatures of dielectric anomalies and magnetic phase transitions indicates that the paraelectric-ferroelectric phase transition at TC1 is induced by a commensurate magnetic ordering along the c axis in RMn2O5.
Masatoshi Sato,Yoshiaki Kobayashi,Takayuki Kawamata,Yukio Yasui,Kazunori Suzuki,M. Itoh,Ryoichi Kajimoto,Kazuhiko Ikeuchi,M. Arai,Phillipe Bourges 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.12
To identify the superconducting symmetry of Fe-based superconductors, we studied effects ofnonmagnetic-impurities on Tc, magnetic excitation spectra 00 and NMR 1/T1 − T curve, whichare sensitive to the relative signs between the order parameters on the disconnected Fermi surfacesin reciprocal space, because the symmetry is closely connected with the pairing mechanism:If the signs are opposite (symmetry S±), the mechanism is considered to be a magneticone, but when the signs are the same (symmetry S++), a novel mechanism is plausible becausethe ordinary phonon mechanism cannot realize the Tc value as high as 55 K found in Ln1111(Ln=lanthanide). Results are as follows: (a) The very small rates of Tc-suppression by impurityatoms M of LnFe1−yMyAs0.89−xF0.11+x (M=Ni, Co, Ru) can be explained only by S++. (b) The00-data for Ba(Fe, Co)2As2 (Tc 23 K) and Ca-Fe-Pt-As crystals seem to be well explained byS++ rather than by S±. (c) The nuclear magnetic resonance data can be consistently understoodby S++, too. These results suggest the S++ symmetry and a novel pairing mechanism, which canbe considered to be related to the elastic softening of C66 induced by the orbital fluctuation of thesystem.
Piston Finger Device for Restoring the Motor Function of Chronic Plegic Fingers
Mengsu Wang,Hirofumi Tanabe,Kenji Ooka,Yoshifumi Morita,Yukio Kobayashi,Hiroyuki Daiko,Takafumi Iziri,Naoki Kiriyama 제어로봇시스템학회 2017 제어로봇시스템학회 국제학술대회 논문집 Vol.2017 No.10
A piston finger technique (PFT) was developed for restoring the motor function of chronic plegic fingers with good outcomes, including reduced spasticity and improved muscle shortening. In our previous work, we analyzed finger motions during treatment with the PFT using a motion capture system. Based on the motion analysis results of treatment with the PFT, we determined the required specifications for a piston finger device (PFD). In this study, we developed a PFD utilizing a crank mechanism. We conducted treatment with the PFD on five patients with chronic plegic fingers. The assessment results based on the Modified Ashworth Scale, the Fast Passive Stretch, and the Passive-ROM (Range Of Motion) before and after treatment with the PFD showed that motor function was improved and abnormal muscle tone had decreased. Therefore, the effectiveness of treatment with the PFD was verified.
Verification of Therapeutic Effect of a Piston Device for Foot with Spastic Paralysis
Nguyen Thi Kieu Chinh,Hirofumi Tanabe,Kenji Ooka,Yoshifumi Morita,Yukio Kobayashi,Takafumi Ijiri 제어로봇시스템학회 2019 제어로봇시스템학회 국제학술대회 논문집 Vol.2019 No.10
The second author has developed a piston technique for restoring the motor function of a chronic plegic foot with good outcomes, including reduced spasticity and improved muscle shortening. In this study, we developed a piston device for foot (PDFt) to simulate the piston technique. The PDFt moves the paralyzed foot passively. We considered the therapeutic effects as well as new findings in treatment with the PDFt. We conducted treatment with the PDFt for five minutes on each of six hemiplegic persons. The therapeutic effect was assessed by measuring the passive range of motion, the active range of motion, and the Modified Ashworth Scale score before and after treatment. The use of the PDFt led to improved motor function and decreased abnormal muscle tone. Therefore, the effectiveness of treatment with the PDFt was verified. Moreover, we conducted a 5-Meter Walk Test before and after treatment for one hemiplegic person and performed a gait analysis. It was confirmed that the treatment also had a good effect on the improvement of gait.
Rehabilitation Support Robot for Self-Standing-Up Training of Hemiplegic Stroke Patients
Masateru Saito,Mizuki Kitamura,Yoshifumi Morita,Hirofumi Tanabe,Yukio Kobayashi,Takafumi Iziri,Hiroyuki Daiko,Naoki Kiriyama 제어로봇시스템학회 2017 제어로봇시스템학회 국제학술대회 논문집 Vol.2017 No.10
The objective of the study involves developing a rehabilitation support robot for self-standing-up training of hemiplegic stroke patients to restore normal standing-up motion. Therapist-guided standing-up training is effective in improving the motor function of a patient’s paralyzed leg. The therapist controls a patient’s left/right load balance by pulling or pushing the patient’s waist during standing-up training. Hence, we investigated the relationship between the patient’s waist movement and the left/right load balance during guided standing-up motion. The analysis results revealed the ideal pattern of the load balance ratio during guided standing-up training. In addition, the results indicate that the patient’s waist movement corresponded to the ideal pattern of the load balance ratio. It is expected that this movement trajectory is useful in designing a controller of a rehabilitation support robot. In order to reproduce the therapist-guided standing-up training with a rehabilitation support robot, it is necessary to consider a control method that can be installed on the robot.