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Tracking of 3D Sound Source Location by Particle Filter with TDOA and Signal Power Ratio
Norikazu Ikoma,Osamu Tokunaga,Hideaki Kawano,Hiroshi Maeda 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
A new sound source tracking method in 3 dimensional space using state space modeling approach and particle filter as a state estimation method has been proposed. Not only TDOA (Time Difference Of Arrival) as our previous works including by the authors, but also using power ratio of two sound signals from microphone pair are effectively used in formulation of state space model. Simulational experiments consisting of 1) fundamental tracking with four microphones and 2) human head tracking in car cabin have been conducted with efficient performance in SNR 20dB environment with about 3,000 number of particles.
Development of Solar Inverter with FRT and DVS Capabilities
Kanao, Norikazu,Mizuo, Kensuke,Fujii, Kansuke The Korean Institute of Electrical Engineers 2013 The Journal of International Council on Electrical Vol.3 No.3
With increasing penetration of renewable energies, especially, photovoltaic energy, more and more concern about power stability will be required because most distributed generators like solar inverters don't have fault ride-through (FRT) capability and reactive power supply capability which is called as dynamic voltage support (DVS). These capabilities haven't been required for a grid code in Japan. Penetration of large amount of PV into power system would deteriorate power system stability in the future. This paper first presents an effect of a distributed generator with FRT and DVS on voltage stability of power system by a simple simulation. Next this paper describes how to perform those capabilities of solar inverter and notes a relation between FRT/DVS and islanding. Then, we examined the methods in a factory test and manufactured a 20-kW prototype of a solar inverter with FRT/DVS capabilities. Finally we performed a field test in real power system, resulting in a good performance.
Funato Norikazu,Yamamoto Masayuki 한국분말야금학회 2006 한국분말야금학회 학술대회논문집 Vol.2006 No.1
Seasonal changes have been recognized in particle characteristics and forming characteristics of iron powder with insulated coating for a compacted magnetic core because of its high hygroscopicity, due to its phosphate coating and resin binder additives. For this reason, particle characteristics and molding characteristics of the powder with diverse water absorbtivity have been studied. The result shows that the higher the volume of absorbed water, the worse the fluidity becomes, resulting in the reduction in both springback during the molding process and expansion reduction after the heat treatment. The requirement on dimension accuracy for the finished product can be satisfied with an additional drying process on the material powder, which contributes to maintain its water volume constant.
장기 앙상블 기후변화 예측실험에서의 북서태평양 주변해역의 해양기후변화
김동훈,Norikazu Nakashiki,Daisuke Tsumune,Yoshikatsu Yoshida,Koki Maruyama,Frank O. Bryan 한국기상학회 2005 Asia-Pacific Journal of Atmospheric Sciences Vol.41 No.2/1
This study investigates the regional responses of a climate model over the historical period, 1870 to the present, and projected response using two new Special Report on Emission Scenarios (SRES) namely A1B and B1, Stabilization Scenarios, and Overshoot Scenario. It is attempted that use of NCAR fully coupled Community Climate System Model (CCSM3) that does not use flux adjustments. At the time of 2100 model year for the SRES A1B scenario, the model predicts the rises in sea level are 18 cm and 17 cm above 2000 model year for the globe and the western North Pacific (WNP), respectively, while the corresponding surface air temperature/sea surface temperature rises are 2.5°C/1.3°C and 2.6°C/2.0°C, respectively. Regional changes of surface air temperature and sea level in the WNP are similar to estimated global average values. However regional change of sea surface temperature is higher than global change. A large-scale warming is found in the basin-wide Sea of Okhotsk, the northwestern part of East (Japan) Sea, and Yellow Sea. The freshening trends are notable in the shelf of Okhotsk Sea in response to melting of sea ice and Yellow Sea due to runoff from Bohai Sea and Yangtze River. In contrast, the salting trend is found in the northwestern part of East (Japan) Sea due to the northward expansion of the Korean Warm Current separation area. 이 연구에서는 해양-대기 접합 대순환 모형을 이용하여 1870년부터 현재까지의 과거 검증 모사와 Special Report on Emission Scenarios (SRES) 중에서 A1B와 B1 시나리오를 사용한 미래 예측, 그리고 시나리오 모사 이후의 A1B와 B1의 온난화가스 안정화 실험과 A1B 안정화단계에서 B1 안정화단계로의 Overshoot 시나리오를 수행하여 얻은 광범위한 모형 결과 중에서 북서태평양 주변의 지역적 분석을 하였다. 수치실험에 사용된 접합 대순환모형은 NCAR에서 제공하는 최신의 Community Climate System Model (CCSM3)을 사용하였으며, 플럭스 보정 (Flux adjustments)은 하지 않았다. SRES A1B 시나리오에서 2100년 경에 대기지면온도/해양표층온도는 2000년에 비교하여 전지구와 북서태평양에 대하여 각각 2.5oC/1.3oC와 2.6oC/2.0oC가 상승하였고 해수의 열팽창에 의한 해수면 상승은 전지구와 북서태평양에 대하여 각각 18 cm와 17 cm가 상승하였다. 다시 말해서, 북서태평양의 대기지면온도와 해수면의 변화는 전지구 평균 변화와 비슷한 양상을 보였으나 해양표층온도의 변화는 전지구에 비해 크게 나타났다. 북서태평양의 지역적 변화에 대해서는, 오호츠크해 주변과 동해의 북서쪽 그리고 황해의 온도상승이 크게 나타났다. 해빙의 녹음으로 인한 오호츠크해의 연안부근의 저염화와 Bohai 해와 양쯔강 주변의 유출수에 의한 황해의 저염화가 크게 나타났으며, 반대로 동해의 북서측은 동한난류 이안부근의 북상으로 고염화가 진행되었다. 컴퓨팅 능력의 제한으로 인한 전지구 대순환모형에서의 지역적 분석은 아직까지 여러가지 문제들이 내재되어 있지만, 전반적인 경향은 크게 다르지 않을 것으로 생각된다.
Hiroshi Matsumura,Norikazu Kinoshita,Hiroshi Iwase,Akihiro Toyoda,Yoshimi Kasugai,Norihiro Matsuda,Yukio Sakamoto,Hiroshi Nakashima,Hiroshi Yashima,Nikolai Mokhov,Anthony Leveling,David Boehnlein,Kamr 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.23
In an antiproton production (Pbar) target station of the Fermi National Accelerator Laboratory (FNAL), the secondary particles produced by bombarding a target with 120-GeV protons are shielded by a thick iron shield. In order to obtain experimental data on high-energy neutron transport at more than 100-GeV-proton accelerator facilities, we indirectly measured more than 100-MeV neutrons at the outside of the iron shield at an angle of 50˚ in the Pbar target station. The measurement was performed by using the Au activation method coupled with a low-background γ-ray counting system. As an indicator for the neutron flux, we determined the production rates of 8 spallation nuclides (^(196)Au, ^(188)Pt, ^(189)Ir, ^(185)Os, ^(175)Hf, ^(173)Lu, ^(171)Lu, and ^(169)Yb) in the Au activation detector. The measured production rates were compared with the theoretical production rates calculated using PHITS. We proved that the Au activation method can serve as a powerful tool for indirect measurements of more than100-MeV neutrons that play a vital role in neutron transport. These results will be important for clarifying the problems in theoretical calculations of high-energy neutron transport.