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Swallowing Motion Analyzing from Dental MR Imaging Based on AKAZE and Particle Filter Algorithm
Kenta Suetani,Huimin Lu,Joo Kooi Tan,Hyoungseop Kim,Tatsurou Tanaka,Shinji Kitou,Yasuhiro Morimoto 제어로봇시스템학회 2018 제어로봇시스템학회 국제학술대회 논문집 Vol.2018 No.10
In recent years, dysphagia is problem among elderly people. Therefore, it is necessary to accurately evaluate swallowing function in order to prevent swallowing disorder beforehand or to detect it early. And it is considered that evaluation of swallowing function using Magnetic Resonance Imaging (MRI) is useful. In order to accurately analyzing of the swallowing motion using a computer aided diagnosis (CAD) system on MR imaging, automatic extraction of the esophagus region, which is a region of interest by the image analysis method, is required. Extraction of the spinal region is required as a preliminary step of the esophagus region extraction. Therefore, in this paper, we develop an analysis method of swallowing movement by three steps of extraction of spinal region, extraction of esophageal region, and analysis of swallowing movement. As an analytical method of swallowing movement, we emphasize the liquid part at the time of swallowing movement using an emphasis map, then follow the liquid tracing by using the AKAZE feature quantity and the particle filter algorithm, and analyze the swallowing motion.
Extraction of Spinal Candidate Region from A Dental MR Imaging
Kenta Suetani,Huimin Lu,Joo Kooi Tan,Hyoungseop Kim,Tatsurou Tanaka,Shinji Kitou,Yasuhiro Morimoto 제어로봇시스템학회 2017 제어로봇시스템학회 국제학술대회 논문집 Vol.2017 No.10
In recent years, dysphagia is problem among elderly people. Therefore, it is necessary to accurately evaluate swallowing function in order to prevent swallowing disorder beforehand or to detect it early, and it is considered that evaluation of swallowing function using MRI is useful, and the demand for development of CAD system using MRI is increasing. In order to accurately analyze the swallowing motion, automatic extraction of the region of interest by the image analysis method is necessary. In this paper, as a pretreatment of a method for automatic extraction of esophageal region on dental MR image, we develop automatic extraction method of spinal candidate region. We first extract the posterior region of the spine and then extract the intervertebral disc region. Then we perform the detection of the anterior region of the spine and finally we extract the region between the anterior region of the spine and the posterior region of the spine as a spinal region. The proposed method was applied to 5 cases of dental MR images, and the results of TP 91.2 [%] and FP 8.8 [%] are obtained.
( Gunam,Ida Bagus Wayan ),( Kenta Yamamura ),( I Nengah Sujaya ),( Nyoman Semadi Antara ),( Wayan Redi Aryanta ),( Michiko Tanaka ),( Fusao Tomita ),( Teruo Sone ),( Kozo Asano ) 한국미생물 · 생명공학회 2013 Journal of microbiology and biotechnology Vol.23 No.4
Helicobacter pylori increased the γ-glutamyltranspeptidase (GGT) production under low-pH (maximal at pH 4) and appropriate pCO2 conditions, while the production of GGT mRNA correlated with increased total enzyme activity. At pH 4, the bacterium augmented enzyme production in the presence of glutamine (~10 mM) in the medium, which predominantly occurred after a 6-min time-lag. Monovalent salts such as NaCl or NH4Cl facilitated enzymatic activation in acidic solutions of approximately pH 4.5. In addition, glutathione`s γ-glutamyl moiety cysteinylglycine appeared to be taken up readily by the intact H. pylori, but not by the one pretreated with a potent GGT inhibitor, acivicin, suggesting that the GGT may partake in glutathione uptake by the cell.
김대성,김종환,Hisayuki Suematsu,Kenta Tanaka,류봉기 대한금속·재료학회 2016 METALS AND MATERIALS International Vol.22 No.2
Pulsed wire discharge using Sn-58 Bi wires was used to synthesize intermetallic Sn-58 Bi compound nanoparticles. We investigate that nanopowder particle size is controlled by voltage and gas atmosphere. A large pulsed current was applied to the alloy wires set between the electrodes in two gas atmosphere such as Ar, N2. We were discussed the results based on the k factor. The k factor means Ec/Ev, where Ec and Ev are the charging energy of the capacitor and the vaporization energy of the wire. Nanoparticles whose composition was close to that of Sn-58 Bi were synthesized under N2 atmosphere and 6 kV voltage. In such conditions, the applied energy to the wire was higher than sublimation energy of the wires. Under the other experimental conditions, other phases such as Bi-rich and Sn-Bi compound phases were detected. The major results in this study demonstrate the synthesis of alloy nano powders by using alloy wire.
High-Speed Camera Analysis for Nanoparticles Produced by using a Pulsed Wire-Discharge Method
김종환,김대성,류봉기,Hisayuki Suematsu,Kenta Tanaka 한국물리학회 2016 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.69 No.1
We investigated the performance of a high-speed camera and the nanoparticle size distribution to quantify the mechanism of synthesized nanoparticle formation in a pulsed wire discharge (PWD) experiment. The Sn-58Bi alloy wire was 0.5 mm in diameter and 32 mm long; it was prepared in the PWD chamber, and the evaporation explosion process was observed by using a high-speed camera. In order to vary the conditions and analyze the mechanisms of nanoparticle synthesis in the PWD, we changed the pressure of the N2 gas in the chamber from 25 to 75 kPa. To synthesize nanoparticles on a nano-scale, we fixed the charging voltage at 6 kV, and the high-speed camera captured pictures at 22,500 frames per second. The experimental results show that the electronic explosion process at different N2 gas pressures can be characterized by using the explosion’s duration and the explosion’s intensity. The experiments at the lowest pressure exhibited a longer explosion duration and a greater intensity. Also, at low pressure, very small nanoparticles with a good dispersion were produced.
( Jong Hwan Kim ),( Dae Sung Kim ),( Hisayuki Suematsu ),( Kenta Tanaka ),( Bong Ki Ryu ) 대한금속재료학회(구 대한금속학회) 2017 대한금속·재료학회지 Vol.55 No.1
We used Sn-58Bi and Cu wires to investigate the effects of variable conditions (such as pressure and wire diameter) on the formation of three-component nanoparticles. In the synthesis of the three-component nanoparticles, pulsed wire discharge was used to sublimate the wires. In this system, the K factor is described as E<sub>c</sub>/E<sub>s</sub>, where E<sub>c</sub> and E<sub>s</sub> are respectively the applied energy and the sublimation energy of the system. Experiments were conducted in a N<sub>2</sub> atmosphere using the following parameters: voltage of 6 kV, pressure of 50-100 kPa, and Cu wire diameters of 0.1 and 0.2 mm. X-ray diffraction and field emission scanning electron microscopy were employed for structural analysis, particle size distribution analysis, collection rate, and composition studies of the nanoparticles. (Received May 4, 2016; Accepted July 12, 2016)
Kim, Dae Sung,Kim, Jong Hwan,Suematsu, Hisayuki,Tanaka, Kenta,Ryu, Bong Ki American Scientific Publishers 2017 Journal of Nanoscience and Nanotechnology Vol.17 No.10
<P>Nanoscale compound powders of Sn-Bi-Cu were successfully synthesized using pulsed wire discharge (PWD). Sn-Bi-Cu powder is used Pb-free soldering materials at low temperature. When the particle size of the Sn-Bi-Cu synthesized as nano-scale has the advantage of lowering the melting point, improving wettability, and stabilizing reaction interface. In PWD, when a high current is passed through high-density metal wires, the wire explodes because of resistance heating, which forms fine particles or metal vapor. We used two wires, Sn-Bi alloy wires and Cu wires, to obtain three-component nanopowders. A high current was applied to the wires between the electrodes in a N-2 atmosphere. We discuss the results based on the K factor, which is E-C/E-V, where E-C and E-V are the charging energy of the capacitor and the vaporization energy of the wire, respectively. Nanoparticles with three components, Sn-Bi-Cu, were synthesized under N-2 atmosphere at voltages of 4/6 kV. According to the particle-size distributions, the mean particle diameter of the prepared Sn-Bi and Cu nanopowders was 14.56-40.36 nm for each condition. In this study, We successfully three-component nanopowders synthesized and subjected two wires to extreme energies by the PWD method to form a nanopowder by overcoming its limited solid solubility.</P>
SUGIYAMA, KOICHIRO,YONEKURA, YOSHINORI,MOTOGI, KAZUHITO,SAITO, YU,FUJISAWA, KENTA,ISHII, SHOTA,MOMOSE, MUNETAKE,HONMA, MAREKI,TAZAKI, FUMIE,TANAKA, KEI E.I.,HOSOKAWA, TAKASHI,UCHIYAMA, MIZUHO,INAYOSHI The Korean Astronomical Society 2015 天文學論叢 Vol.30 No.2
We have initiated single-dish monitoring observations of ~400 methanol maser sources at 6.7 GHz using the Hitachi 32-m radio telescope from December 2012 to systematically research periodic flux variations, which are observed in some methanol maser sources associated with high-mass (proto-)stars. In our monitoring, we have made daily monitoring, so that each source has been observed every nine days with an integration time of 5 min (typical $3{\sigma}$ detection sensitivities of 0.9 Jy). The monitoring observations help us statistically understand periodic flux variations with a period longer than 50 days. As an initial result, we present a new detection of periodic flux variations in the 6.7 GHz methanol maser source G 036.70+00.09. The period of the flux variations is ~53 days (~0.019 cycles $day^{-1}$), and seems to be stable over 9 cycles, at least until the middle of August 2014.