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Experimental Flight of KIT Student’s Rocket in France
Koji Okuda,Yuji Ujimoto,Yuta Otsuka,Takaya Sato,Takuya Shidooka,Daijiro Semba,Kenichi Tominaga,Junichi Fukuda,Yuta Yamamoto,Kazuki Wada,Shinichi Sagara,Koichi Yonemoto 한국항공우주학회 2008 한국항공우주학회 학술발표회 논문집 Vol.- No.-
KIT Student's Rocket has been developed by a student group of Kyushu Institute of Technology lor rocket launch campaign held at La Courtine in France since 2006. This paper introduces the newest design of rocket. The rocket has the body length of 2120㎜, and weighs 14.6㎏ and can reach to an altitude of about 700㎜ by a solid rocket motor provided by CNES (the French Centre National D’Etudes Spatiales). The rocket is controlling rolling attitude during ascent phase and then deploying a parafoil at the apogee of the trajectory for recovery guidance to an aiming point.
Di-Higgs enhancement by neutral scalar as probe of new colored sector
Nakamura, Koji,Nishiwaki, Kenji,Oda, Kin-ya,Park, Seong Chan,Yamamoto, Yasuhiro Springer-Verlag 2017 European Physical Journal C Vol.77 No.5
<P>We study a class of models in which the Higgs pair production is enhanced at hadron colliders by an extra neutral scalar. The scalar particle is produced by the gluon fusion via a loop of new colored particles, and decays into di-Higgs through its mixing with the Standard Model Higgs. Such a colored particle can be the top/bottom partner, such as in the dilaton model, or a colored scalar which can be triplet, sextet, octet, etc., called leptoquark, diquark, coloron, etc., respectively. We examine the experimental constraints from the latest Large Hadron Collider (LHC) data, and discuss the future prospects of the LHC and the Future Circular Collider up to 100 TeV. We also point out that the 2.4 s excess in the b (b) over bar gamma gamma final state reported by the ATLAS experiment can be interpreted as the resonance of the neutral scalar at 300 GeV.</P>
Low Dose Ultraviolet Al (340-400 nm) Phototherapy for Erythrodermic Cutaneous T-cell Lymphoma
Uede, Koji,Hiroi, Akihisa,Nakamura, Tomoyuki,Kishi, Tomoo,Yamamoto, Yuki,Furukawa, Fukumi Korean Society of Photoscience 2002 Journal of Photosciences Vol.9 No.2
Three patients suffering from widespread erythrodermic cutaneous T-cell lymphoma were treated with low-dose UVAI phototherapy with a single dose of 20 - 30J/$cm^2$, resulting in cumulative doses of 520 - 1890 J/$cm^2$. Two patients showed complete responses, while other had a partial improvement.
Unstructured-Mesh-Based Simulation for Subsonic and Supersonic Flow Control with a Plasma Actuator
Junya Yamamoto,Koji Shimoyama,Shinkyu Jeong,Shigeru Obayashi,Takashi Matsuno,Hiromitsu Kawazoe 한국항공우주학회 2008 한국항공우주학회 학술발표회 논문집 Vol.- No.-
A plasma actuator is a simple device that can control flow with low power supply, so this is very practical and several applications have been proposed by many researchers. In this paper, a numerical method for simulating the flow with a plasma actuator is proposed, and it is applied to supersonic flow as well as subsonic flow. This method adopts unstructured mesh so that it can be employed for complex geometries. A numerical model proposed by Suzen et al. is used for simulating the phenomena caused by a plasma actuator, and TAS-code is employed for the flow field prediction. First, this paper validated the proposed method through two test calculations for subsonic flow; the Hump model used at CFD validity workshop in NASA Langley and then the NACA0015 airfoil. According to the results of the subsonic test calculations, the present method was able to predict the effects of the plasma actuator to the flow separation correctly. Finally, a calculation with the ramp model is conducted to control the shock wave, and its capability to control the shock wave through the shift in the shock wave location was confirmed.
Stochastic Geometry Analysis of Normalized SNR-Based Scheduling in Downlink Cellular Networks
Ohto, Takuya,Yamamoto, Koji,Kim, Seong-Lyun,Nishio, Takayuki,Morikura, Masahiro IEEE 2017 IEEE wireless communications letters Vol.6 No.4
<P>The coverage probability and average data rate of normalized SNR-based scheduling in a downlink cellular network are derived by modeling the locations of the base stations and users as two independent Poison point processes. The scheduler selects the user with the largest instantaneous SNR normalized by the short-term average SNR. In normalized SNR scheduling, the coverage probability when the desired signal experiences Rayleigh fading is shown to be given by a series of Laplace transforms of the probability density function of interference. Also, a closed-form expression for the coverage probability is approximately achieved. The results confirm that normalized SNR scheduling increases the coverage probability due to the multi-user diversity gain.</P>
Morimoto, Tetsuya,Yamamoto, Koji,Ogihara, Shinji The Korean Society for Composite Materials 2007 Advanced composite materials Vol.16 No.3
The single-modal Weibull model has been assessed on Tyranno ZMI Si-Zr-C-O fiber if a set of shape and scale parameters accurately reproduced the effect of the size of the diameter on strength. The tensile data of a single fiber have been divided into two expedient groups as 'small diameter' group and 'large diameter' group in deriving the parameters, which should be consistent if the Weibull model accurately reproduced the size effect. However, the derived Weibull parameters were inconsistent between the two groups. Thereby the authors have concluded that the parameters of the single-modal Weibull model are dependent on the fiber diameter, so that the model is inadequate to reproduce the strength size effect. On the other hand, Weibull parameters were found consistent between the two groups by excluding the data of 'large mirror zone' sample, which was defined as the sample around 10% mirror zone area of the fracture surface. What is more, the exclusion reduced the strength variance more drastically in the 'large diameter' group than in the 'small diameter' group, even though the 'large mirror zone' samples were found identical in the percentage between the two groups. The authors therefore conclude that diameter limitation to the 'small diameter' group level can lead to drastically less distributed strength values than the estimated strength through the Weibull scaling on the present Tyranno ZMI Si-Zr-C-O fiber.
Naoki Yoshida,Hisashi Yamamoto,Tomoaki Akiba,Koji Shingyochi,Xiao Xiao 대한산업공학회 2015 대한산업공학회 추계학술대회논문집 Vol.2015 No.11
In the multi-state consecutive-k-out-of-n:F system, both the components and the system are allowed to be in M + 1 possible state. One of the most important problems in the multi-state consecutive-k-out-of-n:F system is the optimal arrangement problem wherein the solution is obtained by the arrangement of components with maximum expectation of system states. In general, the optimal arrangements depend on the values of component state probabilities. It is known, however, that for some cases, optimal arrangements do not depend on the values of component state probabilities but on the magnitude relationships of component state probabilities. In this paper, we investigate characteristics of optimal arrangements in multi-state consecutive-k-out-of-n:F systems. We propose characteristics of invariable optimal arrangement on some conditions.