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Small Angle Neutron Scattering Study on the Structural Variation of Lysozyme in Bioprotectants
Shota Koda,Haruki Takayama,Tomohiko Shibata,Tatsuya Mori,Seiji Kojima,In-Sung Park,Tae-Gyu Shin 한국물리학회 2015 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.66 No.9
The thermal denaturation and subsequent structural variation of lysozyme in various bioprotectant candidate solutions such as trehalose and choline acetate have been investigated by using small angle neutron scattering and differential scanning calorimetry. The gyration radius shows little change with the addition of additives in a native state at room temperature. On heating the lysozyme solution, a remarkable increase in the gyration radius is observed at temperatures above the denaturation temperature without any bioprotectants. Such an increase is suppressed by the additives owing to the intermolecular interactions between the lysozyme molecules and the bioprotectants of trehalose and choline acetate. The fractal dimension of lysozyme varies slightly with the addition of the bioprotectant solutions, and shows a remarkable drop in the vicinity of the denaturation temperature for all the solutions.
A method for extraction of arbitrary figure using one-dimensional histogram
Shota Nakashima,Makoto Miyauchi,Seiichi Serikawa 제어로봇시스템학회 2008 제어로봇시스템학회 국제학술대회 논문집 Vol.2008 No.10
An extraction of a specific figure in image has basic problems in intelligent image sensing. The generalized Hough transform (GHT) is the representative method to extract arbitrary figures which are rotated and enlarged or reduced. Many the improvement models were also proposed. However, for extraction of arbitrary figures, it takes much processing time and needs much memory space. In addition, it is impossible to apply the GHT to figures including branches. For an improvement of the problems, a new method to extract arbitrary figure using one-dimensional histogram is proposed in this study. The method utilizes the Polytope method which is one of minimization algorithms. For the extraction of figures, one-dimensional histogram is used. The histogram has two characteristics. (1) The distribution of histogram changes if the parameters representing figure changes. (2) The best parameters are gotten, if the value of most frequency of histogram becomes maximum. Therefore, by using the Polytope method, the best parameters are searched so that the maximum value of most frequency can be maximum. In comparison with conventional method, it is understood that memory space is very small, processing time is very short and figures including branches can be extracted. In addition, this method is effective for an extraction of arbitrary figure with different aspect ratio.
Shota MIYAGUCHI,Nobutomo MATSUNAGA,Shigeyasu KAWAJI 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
Continuous passive motion(CPM) is an orthopedic treatment or a physiotherapy after surgery. After surgery to injury of ulna collateral ligament(UCL) in the elbow, excessive extension of the UCL aggravates the injury, and reaction force at hand of patient increase sexcessively near the end of the range of motion due to increased stiffness. It is known that controlling pro-/supination is effective to suppress the reaction force, but the UCL may be extended excessively by the pro-/supination. In this paper, we focus on the treatment after the surgery to UCL and propose the trajectory generation method to control the pro-/supination in order to suppress both there action force and the UCL extension based on skeleton model. Finally, experimental results with simulated patient show the effectiveness of the proposed method.
Shota Kanno,Sumito Kashihara,Seonghee Jeong 제어로봇시스템학회 2014 제어로봇시스템학회 국제학술대회 논문집 Vol.2014 No.10
In a pHRI, physical contact between humans and robots may happen occasionally or on purpose. Extensive efforts have been made to develop safety measures reducing human injury and improving human safety. Contact sensor is a fundamental requirement for those robots to sense the contact with humans and to take appropriate safety measures. In this paper, we propose a safety confirmation type wide-range detectable contact sensor that detects an ultrasonic wave propagating through a viscoelastic tube. The proposed sensor generates ultrasonic waves from a transmitter installed at the end of a long and slender viscoelastic tube, and detects the waves as safety monitoring signals by a receiver located at the other end. For all cases where safety monitoring signals is not detected, such as an abnormal state of ultrasonic wave and sensor elements failure, it does not transmit safety. An estimation equation related to the propagating sound pressure and time of an ultrasonic wave in the silicon tube was derived through experimental investigation on the propagation characteristics in a straight and a curved tube. It was confirmed that a safety monitoring signal was successively generated in an arbitrary curved tube by setting an appropriate safety threshold which was calculated using the estimation equation.
Automatic Segmentation of Phalanges Regions on CR Images Based on MSGVF Snakes
Shota KAJIHARA,Seiichi MURAKAMI,Hyoungseop KIM,Joo Kooi TAN 제어로봇시스템학회 2014 제어로봇시스템학회 국제학술대회 논문집 Vol.2014 No.10
Rheumatoid arthritis and osteoporosis are two common orthopedic diseases. Rheumatoid arthritis is a disease that inflammation occurs in the joint, which always causes the joints are able to move freely. Osteoporosis is a disease that bone mineral content is reduced and risk of fragility fracture increases. As one of the diagnostic methods, medical imaging by photographed CR equipment has been widely accepted. However, some problems such as mass screening data sets and mis-diagnosis are still remained in visual screening. In order to solve these problems and reduce the burden to physicians, needs of an automatic diagnosis system capable of performing quantitative analysis is anticipated. In this paper, we carry out the development of a segmentation method of phalanges regions from CR images of the hand to perform a quantitative evaluation of rheumatoid arthritis and osteoporosis. The proposed method is carried out crude segmentation of phalanges regions from CR images of the hand, and extracts the detailed phalanges regions by Multi Scale Gradient Vector Flow Snakes (MSGVF) method. In our study, we performed Snakes algorithm to give an initial control points on MSGVF algorithm. We applied our method on three pairs of CR temporal images of phalanges regions, which are called as the previous images and the current images. We got the segmentation results of 5.95 [%] of false-positive rate and 92.9 [%] of true-positive rate.
Shota Taki,Dragomir Nenchev 제어로봇시스템학회 2013 제어로봇시스템학회 국제학술대회 논문집 Vol.2013 No.10
This paper investigates the problem of attitude control of a rigid-body. The main contribution is the design of an attitude controller based on the Euler angle representation. The inherent singularity problem is tackled via the Singularity-Consistent method developed previously for robot end-link tracking control in the vicinity of kinematic singularities. It is shown that the controller guarantees almost global exponential stability. Numerical simulations are provided to illustrate the performance and show the effectiveness of the proposed controller for large angle eigenaxis attitude maneuvers.
Shota Takenaka,Yoshihiro Mukai,Noboru Hosono,Takeshi Fuji 대한척추외과학회 2014 Asian Spine Journal Vol.8 No.3
Study Design: A retrospective study. Purpose: To clarify the differences among the three major surgeries for osteoporotic vertebral fractures based on the clinical and radiological results. Overview of Literature: Minimally invasive surgery like balloon kyphoplasty has been used to treat osteoporotic vertebral fractures, but major surgery is necessary for severely impaired patients. However, there are controversies on the surgical procedures. Methods: The clinical and radiographic results of patients who underwent major surgery for osteoporotic vertebral fracture were retrospectively compared, among anterior spinal fusion (group A, 9 patients), single-stage combined anterior-posterior procedure (group AP, 8 patients) and posterior closing wedge osteotomy (group P, 9 patients). Patients who underwent revision surgery were evaluated just before the revision surgery, and the other patients were evaluated at the final follow-up examination, which was defined as the end point of the evaluations for the comparison. Results: The operation time was significantly longer in group AP than in the other two groups. The postoperative correction of kyphosis was significantly greater in group P than in group A. Although the differences were not significant, better outcomes were obtained in group P in: back pain relief at the end point; ambulatory ability at the end point; and average loss of correction. Conclusions: The posterior closing wedge osteotomy demonstrated better surgical results than the anterior spinal fusion procedure and the single-stage combined anterior-posterior procedure.
Superconductivity in KSn2 with the MgZn2-type Structure
Shota Miyazaki,Kenji Kawashima,Tsukasa Ipponjima,Michinori Fukuma,Daiki Hyakumura,Jun Akimitsu,Masaaki Yoshikawa 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.63 No.3
We report here the sysnthesis and discovery of a new superconductor potassium distannide KSn2. KSn2 has a hexagonal crystal structure with a space group of P63/mmc, which is called the MgZn2-type (C14) structure belonging to the famous family of Laves phases. The calculated lattice constantsa and c are 0.6427(4) and 1.043(6) nm, respectively. From the magnetic susceptibility measurement,KSn2 shows a superconducting transition at around 3.2 K.