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Analysis of Local Vibrations in the Stay Cables of the Hizen-Takashima Bridge
Kazuo Takahashi,Kensuke Tanaka,Shozo Nakamura 한국강구조학회 2008 International Journal of Steel Structures Vol.8 No.4
Local parametric vibrations of the stay cables of the Hizen-Takashima Bridge, which is currently under construction, are studied. This bridge is a composite cable-stayed bridge with a steel girder and concrete towers. The natural frequencies of the global vibration modes are obtained using a three-dimensional FEM model. Relations between global natural frequencies and the local natural frequencies of the stay cables are first demonstrated and the results are compared with other cable-stayed bridges. The local vibrations of the stay cables at the support during global motion are obtained and the properties of the local vibrations are discussed. Local parametric vibrations of the stay cables of the Hizen-Takashima Bridge, which is currently under construction, are studied. This bridge is a composite cable-stayed bridge with a steel girder and concrete towers. The natural frequencies of the global vibration modes are obtained using a three-dimensional FEM model. Relations between global natural frequencies and the local natural frequencies of the stay cables are first demonstrated and the results are compared with other cable-stayed bridges. The local vibrations of the stay cables at the support during global motion are obtained and the properties of the local vibrations are discussed.
Development of a Plasma Control System for Steady-state Operation on QUEST
Makoto Hasegwa,Kazuo Nakamura,Hideki Zushi,Kazuaki Hanada,Akihide Fujisawa,Keisuke Matsuoka,Hiroshi Idei,Yoshihiko Nagashima,Kazutoshi Tokunaga,Shoji Kawasaki,Hisatoshi Nakashima,Aki Higashijima 한국물리학회 2014 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.65 No.8
A drift error correction technique with machine vision and a real-time equilibrium calculation codehave been developed on the QUEST (Q-shu university experiment with the steady-state sphericaltokamak) for steady-state operation. The drift error caused by the long time-integration of magneticraw signals has to be removed. With a captured image of the plasma’s cross section, the plasma’sposition is identified by use of image filters. The measured magnetic flux values are corrected to thecalculated flux values estimated by using this plasma position. The correction with the capturedimage work as expected in the preliminary result using a flashlight instead of a plasma.
북극 스발바드 콩스피오르덴 해역에서 L 밴드 PALSAR 데이터를 이용한 눈과 부빙에 의한 다중편파 산란특성 해석
정정수,양찬수,Kazuo Ouchi,Kuzaki Nakamura 한국해양과학기술원 2011 Ocean and Polar Research Vol.33 No.1
This study describes measurements of fast ice recorded on May 23, 2009, in Kongsfjorden (translated as ‘Kongs Fjord’), an inlet on the west coast of Spitsbergen in the Svalbard Archipelago. Seasonal fast ice is an important feature for Svalbard fjords, both in relation to their physical environment and also the local ecosystem, since it grows seaward from the coast and remains in place throughout the winter. Ice thickness, snow, ice properties, and wind speed were measured, while SAR (Synthetic Aperture Radar) data was observed simultaneously observed two times from ALOS-PALSAR (L-band). Measured ice thickness was about 25-35 cm while the thickness of ice floe broken from fast ice was measured as 10-15 cm. Average salinity was 1.9-2.0 ppt during the melting period. Polarimetric data was used to extract H/A/alpha-angle parameters of fast ice, ice floe, snow and glacier, which was classified into 18 classes based on these parameters. It was established that the area of fast ice represents surface scattering which indicates low and medium entropy surface scatters such as Bragg and random surfaces, while fast ice covered with snow belongs to a zone of low entropy surface scattering similar to snow-covered land surfaces. The results of this study will contribute to various interpretations of interrelationships between H/A/alpha parameters and the wave scattering Phenomenon of sea ice.
( Junya Yano ),( Tatsuki Aoki ),( Kazuo Nakamura ),( Kazuo Yamada ),( Shin-ichi Sakai ) 한국폐기물자원순환학회(구 한국폐기물학회) 2015 한국폐기물자원순환학회 3RINCs초록집 Vol.2015 No.-
Hydrogenated biodiesel (HBD) is envisaged as a new type of diesel. Some byproducts of the HBD production process could also replace fossil fuels; therefore, increasing these substitution amounts could contribute to reducing the burden on the environment. The purpose of this study was to clarify the reduction of the environmental burden brought about by combining the HBD production from waste cooking oil with the anaerobic digestion (AD) of food waste. A life cycle assessment (LCA) was conducted, in which a combined functional unit was established, which included “the treatment of the household waste and the waste cooking oil annually generated in Kyoto city” and “running a diesel vehicle for household waste collection.” The base scenario was that all household waste and waste cooking oil were incinerated. The results indicated that compared with the base scenario, utilizing the combined HBD production system and the AD of food waste could bring about a reduction of 41.8% in the integrated environmental effects (global warming, fossil fuel consumption, acidification, and urban air pollution). The reduction of greenhouse gases compared with the base scenario was 18,100 t-CO<sub>2</sub>eq/yr. Substitutions with the byproducts of the HBD production process could reduce greenhouse gas emissions by 1,070 t-CO<sub>2</sub>eq/yr.
Evaluating Mental State of Final Year Students Based on POMS Questionnaire and HRV Signal
Santoso Handri,Shusaku Nomura,Kazuo Nakamura 한국지능시스템학회 2010 INTERNATIONAL JOURNAL of FUZZY LOGIC and INTELLIGE Vol.10 No.1
Final year students are normally encountering high pressing in their study. In view of this fact, this research focuses on determining mental states condition of college student in final year based on the psycho-physiological information. The experiments were conducted in two times, i.e., prior- and post- graduation seminar examination. The early results indicated that the student profile of mood states (POMS) in prior final graduation seminar showed higher scores than students in post final graduation seminar. Thus, in this research, relation between biosignal representing by heart rate variability (HRV) and questionnaire responses were evaluated by hidden Markov model (HMM) and neural networks (NN).
Yamauchi, Toshimasa,Hara, Kazuo,Maeda, Shiro,Yasuda, Kazuki,Takahashi, Atsushi,Horikoshi, Momoko,Nakamura, Masahiro,Fujita, Hayato,Grarup, Niels,Cauchi, Stephane,Ng, Daniel P K,Ma, Ronald C W,Tsunoda, Nature Publishing Group, a division of Macmillan P 2010 Nature genetics Vol.42 No.10
We conducted a genome-wide association study of type 2 diabetes (T2D) using 459,359 SNPs in a Japanese population with a three-stage study design (stage 1, 4,470 cases and 3,071 controls; stage 2, 2,886 cases and 3,087 controls; stage 3, 3,622 cases and 2,356 controls). We identified new associations in UBE2E2 on chromosome 3 and in C2CD4A-C2CD4B on chromosome 15 at genome-wide significant levels (rs7612463 in UBE2E2, combined P = 2.27 ? 10<SUP>??9</SUP>; rs7172432 in C2CD4A-C2CD4B, combined P = 3.66 ? 10<SUP>??9</SUP>). The association of these two loci with T2D was replicated in other east Asian populations. In the European populations, the C2CD4A-C2CD4B locus was significantly associated with T2D, and a combined analysis of all populations gave P = 8.78 ? 10<SUP>??14</SUP>, whereas the UBE2E2 locus did not show association to T2D. In conclusion, we identified two new loci at UBE2E2 and C2CD4A-C2CD4B associated with susceptibility to T2D.