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Insufficient Self-Shielding Correctionin JSSTDL-300
C. Konno,K. Ochiai,S. Ohnishi 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.23
JSSTDL-300 is a multigroup library for shielding applications produced from JENDL-3.2. The self-shielding correction in JSSTDL-300 is probably inadequate due to the following two reasons, 1) the weighting flux of Legendre order 0 is applied to all Legendre orders, 2) the f-table of the scattering matrix is the same as that of the elastic scattering. Thus we examined the effects of these problems through a simple benchmark test, the model of which consisted of an aluminum, iron, nickel or copper sphere of 1 m in radius with a 20 MeV neutron source in the center. Neutron spectra in the sphere were calculated with ANISN and they were compared with those obtained with MCNP4C. It was found out that the effects were dependent on materials and were the largest for copper. Adequate f-table data and weighting flux should be adopted in generation of multigroup libraries.
Torque Display Method for Free-Form Deformation with Haptic Device
Yoshimasa Tokuyama,R.P.C. Janaka Rajapakse,Yuji Nakazawa,Kouichi Konno 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
Haptic devices provide a powerful interface that allows users to use their sense of touch to interact with 3D shapes. Even though much research has been done on haptics-based design and sculpting, less effort has been spent on applications related to torque computing and to rque-based modeling. We have constructed a 3D shape modeling and modification system based on a haptic device, with acceptable interactivity to improve intuition. Bending and twisting formulations are widely used in physical modeling and sculpting. The use of to rque-based haptic interaction for deforming and editing 3D shapes has the potential to magnify artistic intuition and creativity of designers. In this paper, we propose a torque display method for free-form deformation(FFD) with haptic device. The combination of bending and twisting extends the editing capabilities of constructed shape deformation system by means of screw-motions.
S. Ohnishi,K. Kondo,S. Sato,K. Ochiai,K. Takakura,C. Konno,I. Murata 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.23
A new collimator system was constructed to produce a new collimated DT neutron beam for new integral benchmark experiments at the first target room of the Fusion Neutronics Source facility in Japan Atomic Energy Agency. The collimator system had been designed and optimized with a neutron transport calculation code and the performance of the collimated DT neutron beam was tested with an imaging plate, activation foil and a scintillation counter. The DT neutron flux at the exit of the collimator hole was 2.22 × 10^6 cm^(-2)s^(-1), which was 239 times as large as that at the 2 cm off-centered position. It was confirmed that the new DT neutron beam had a good performance as expected.