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Generation of inflow turbulent boundary layer for LES computation
Kondo, K.,Tsuchiya, M.,Mochida, A.,Murakami, S. Techno-Press 2002 Wind and Structures, An International Journal (WAS Vol.5 No.2
When predicting unsteady flow and pressure fields around a structure in a turbulent boundary layer by Large Eddy Simulation (LES), velocity fluctuations of turbulence (inflow turbulence), which reproduce statistical characteristics of the turbulent boundary layer, must be given at the inflow boundary. However, research has just started on development of a method for generating inflow turbulence that satisfies the prescribed turbulence statistics, and many issues still remain to be resolved. In our previous study, we proposed a method for generating inflow turbulence and confirmed its applicability by LES of an isotropic turbulence. In this study, the generation method was applied to a turbulent boundary layer developed over a flat plate, and the reproducibility of turbulence statistics predicted by LES computation was examined. Statistical characteristics of a turbulent boundary layer developed over a flat plate were investigated by a wind tunnel test for modeling the cross-spectral density matrix for use as targets of inflow turbulence generation for LES computation. Furthermore, we investigated how the degree of correspondence of the cross-spectral density matrix of the generated inflow turbulence with the target cross-spectral density matrix estimated by the wind tunnel test influenced the LES results for the turbulent boundary layer. The results of this study confirmed that the reproduction of cross-spectra of the normal components of the inflow turbulence generation is very important in reproducing power spectra, spatial correlation and turbulence statistics of wind velocity in LES.
Mahmood A. Hamed,Seiichi Nakata,Ramadan H. Sayed,Hiromi Ueda,Badawy S. Badawy,Yoichi Nishimura,Takuro Kojima,Noboru Iwata,Ahmed R. Ahmed,Khalid Dahy,Naoki Kondo,Kenji Suzuki 대한이비인후과학회 2016 Clinical and Experimental Otorhinolaryngology Vol.9 No.4
Cholesteatoma is a cystic non tumorous lesion of the temporal bone that has the ability to destroy nearby structures by its power to cause bone resorption and as a result, fatal complications prevail. We aimed to conduct a comprehensive review for pathogenesis of acquired cholesteatoma, bone resorption mechanisms, and offer a future vision of this serious disease. We have reviewed different theories for pathogenesis of acquired cholesteatoma including the most relevant and updated ones with special emphasis on the mechanisms of bone resorption through Medline/PubMed research using the keywords ‘aetiopathogenesis, bone resorption, acquired cholesteatoma, temporal bone, and cytokines.’ In order to strengthen our study, we searched the reference lists of identified reviews. Cholesteatoma is a subject of debate among otolaryngologists since it was prescribed firstly. Over many decades, several theories were postulated for aetiopathogenesis of cholesteatoma with a tendency to follow more than one theory to explain the proper nature of that disease. Until now, the mechanism of bone resorption has yet to be more clarified. In the last century, a leap has occurred in the field of biomolecular cholesteatoma research which improved our knowledge about its pathophysiology and bone destructive mechanism. However, surgery is still the only available treatment. We conclude that discovery of new therapeutic choices for cholesteatoma other than surgery by the use of anti-growth, anti-proliferative, apoptotic agents as well as medications that antagonize osteoclastogenesis should be the main concern in the future clinical and experimental research work. Also, searching for predictors of the aggressiveness of cholesteatoma can affect the timing of intervention and prevent occurrence of complications.
Tshoo, K.,Satou, Y.,Bertulani, C.A.,Bhang, H.,Choi, S.,Nakamura, T.,Kondo, Y.,Deguchi, S.,Kawada, Y.,Nakayama, Y.,Tanaka, K.N.,Tanaka, N.,Togano, Y.,Kobayashi, N.,Aoi, N.,Ishihara, M.,Motobayashi, T. Elsevier 2014 Physics letters: B Vol.739 No.-
<P><B>Abstract</B></P> <P>One-neutron knockout from <SUP>24</SUP>O leading to the first excited state in <SUP>23</SUP>O has been measured for a proton target at a beam energy of 62 MeV/nucleon. The decay energy spectrum of the neutron unbound state of <SUP>23</SUP>O was reconstructed from the measured four momenta of the <SUP>22</SUP>O fragment and emitted neutron. A sharp peak was found at <SUB> E decay </SUB> = 50 ± 3 keV , corresponding to an excited state in <SUP>23</SUP>O at 2.78 ± 0.11 MeV , as observed in previous measurements. The longitudinal momentum distribution for this state was consistent with <I>d</I>-wave neutron knockout, providing support for a <SUP> J π </SUP> assignment of 5 / <SUP> 2 + </SUP> . The associated spectroscopic factor was deduced to be <SUP> C 2 </SUP> S ( 0 <SUB> d 5 / 2 </SUB> ) = 4.1 ± 0.4 by comparing the measured cross section ( σ − 1 n exp = 61 ± 6 mb ) with a distorted wave impulse approximation calculation. Such a large occupancy for the neutron 0 <SUB> d 5 / 2 </SUB> orbital is in line with the N = 16 shell closure in <SUP>24</SUP>O.</P>
Hisashi Koiwa,,Stephane Hausmann,Bang, Woo-Young,Akihiro Ueda,Naoko Kondo,Akihiro Hiraguri,Toshiyuki Fuku,hara,Bahk, Jeong-Dong,Yun, Dae-Jin,Ray A. Bressan,Paul M. Hasegawa,Stewart Shuman Plant molecular biology and biotechnology research 2004 Plant molecular biology and biotechnology research Vol.2004 No.-
Transcription and mRNA processing are regulated by phosphorylation and dephosphorylation of the C-terminal domain (CTD) of RNA polymerase Ⅱ, which consists of tandem repeats of a Y^(1)S^(2)P^(3)T^(4)S^(5)P^(6)S^(7) heptapeptide. Previous studies showed that members of the plant CTD phosphatase-like (CPL) protein family differentially regulate osmotic stress-responsive and abscisic acid-responsive transcription in Arabidopsis thaliana. Here we report that AtCPL1 and AtCPL2 specifically dephosphorylate Ser-5 of the CTD heptad in Arabidopsis RNA polymerase Ⅱ, but not Ser-2. An N-terminal catalytic domain of CPL1, which suffices for CTD Ser-5 phosphatase activity in virto, includes a signature DXDXT acylphosphatase motif, but lacks a breast cancer 1 CTD, which is an essential component of the fungal and metazoan Fcp1 CTD phosphatase enzymes. The CTD of CPL1, which contains two putative double-stranded RNA binding motifs, is essential for the in vivo function of CPL1 and includes a C-terminal 23-aa signal responsible for its nuclear targeting. CPL2 has a similar domain structure but contains only one double-stranded RNA binding motif. Combining mutant alleles of CPL1 and CPL2 causes synthetic lethality of the male but not the female gametes. These results indicate that CPL1 and CPL2 exemplify a unique family of CTD Ser-5-specific phosphatases with an essential role in plant growth and development.
Magnetic Properties of Fe-doped NiO Nanoparticles
A. Kurokawa,N. Sakai, L. Zhu,H. Takeuchi,S. Yano,T. Yanoh,K. Onuma,T. Kondo,K. Miike,T. Miyasaka,Y. Ichiyanagi 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.63 No.3
Ni1−xFexO (x = 0, 0.05, 0.1) nanoparticles with several nanometers encapsulated with amorphousSiO2 were prepared by our novel preparation method. A NiO single phase structure was confirmedusing the X-ray diffraction measurements. It is considered that Ni ions are replaced by Fe ionsbecause it is observed that the lattice constant decreases. The temperature dependence behaviorof the magnetization revealed that the blocking temperature, TB, shifted from 17 to 57 K as theamount of Fe ions increased, and that below TB, ferromagnetic behaviors were exhibited. Thecoercive force, HC, increased from 0.8 to 1.5 kOe as the amount of Fe ions increased.
A STUDY OF THE GALACTIC CENTER REGIONS USING THE IMPROVED DATA OF THE MID-INFRARED ALL-SKY SURVEY
Mouri, A.,Kaneda, H.,Ishihara, D.,Oyabu, S.,Kondo, T.,Suzuki, S.,Yasuda, A.,Onaka, T. The Korean Astronomical Society 2012 天文學論叢 Vol.27 No.4
Among the AKARI all-sky survey data, the $9{\mu}m$ diffuse map is crucial to study the polycyclic aromatic hydrocarbon (PAH) emission features on large spatial scales, while the $18{\mu}m$ map is useful to trace hot dust emission. To utilize these advantages, we have improved the AKARI mid-infrared (MIR) all-sky survey diffuse maps. For example, we have established special methods to remove the effects of the ionizing radiation in the South Atlantic Anomaly (SAA) and of the scattered light from the moon. Using improved diffuse map data, we study the properties of PAHs and dust in the Galactic center region associated with high-energy phenomena.
Development of Large-capacity SVC Using Self-protective Light-triggered Thyristor
A. Ohtake,T. Fujimoto,M. Imura,K. Kondo 전력전자학회 2011 ICPE(ISPE)논문집 Vol.2011 No.5
A static var compensator (SVC) was developed using a light-triggered thyristor with an overvoltage self-protection function. In order to reduce the installation space for the equipment, we adopted a multiple valve unit (MVU) structure. This paper introduces the thyristor valve developed for a large-capacity SVC and some results of factory tests and experiences from operation in the field. The advantages of the proposed SVC are described in comparison with the conventional one.
Plasma Breakdown using Second Harmonic EC Waves in Helical Devices
Kazunobu Nagasaki,A. Cappa,A. Fernandez,D. Tafalla,E. de la Cal,F. Tabares,F. Sano,F. Castejon,H. Shidara,H. Okada,K. Kondo,K. Takahashi,S. Kobayashi,T. Mizuuchi,T. Estrada,V. Tribaldos,Y. Yoshimura 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.49 No.III
Plasma breakdown using second-harmonic electron cyclotron (EC) waves has been studied experimentally in three helical devices, Heliotron J, TJ-II and CHS. Recent technological progress on electron cyclotron heating (ECH) systems enables us to determine what the important factors for second-harmonic plasma breakdown are. Comparison of the experimental results among three devices shows a common feature that the plasma starts up from the good confinement region and strongly depends on the nonlinear interactions with the electric field of the local beam rather than the multi-reflected field. This suggests that the confinement of high energy electrons generated by ECH has a dominant role in second-harmonic plasma breakdown.
Stereo Based Vision System for Cardiac Auscultation Tele-Diagnostic System
S. Kumpituck,W. Kongprawechnon,T. Kondo,K. Tungpimolrut,A. Nishihara 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
This paper presents a stereo based vision system which will be used to determine the stethoscope locationon the human body in a cardiac auscultation tele-diagnostic system. The system is aimed at overcoming the problem ofinsufficient number of doctors comparing with the higher number of patients. The stereo vision system simulateshuman vision. The reconstruction of the point in three-dimensional space can be done by using the knowledge ofcamera calibration, image rectification, epipolar geometry, and disparity computation.