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3차원 인텐시티 프로브의 근거리 음장 측정에서의 오차 수치해석
김석재,지석근,김천덕,Kim, Suk-Jae,Jee, Suk-Kun,Suzuki, Hideo,Kim, Chun-Duck 한국음향학회 1994 韓國音響學會誌 Vol.13 No.3
이 연구에서는 3차원 음향 인텐시티를 동시에 측정할 수 있는 프로브를 이용하여 음향 인텐시티를 측정할 때 필연적으로 발생하는 오차를 컴퓨터의 수치계산으로 검토하였다. 이 3차원 음향 인텐시티 프로브는 Suzuki등에 의해 제안된 4개의 마이크로폰으로 구성된 것이고, 수치계산에서는 이상적인 점음원과 유한 크기를 가지는 면음원에 대해서 프로브의 각 축방향 및 임의의 방향에 대한 측정오차를 근거리 음장에서 분석하였다. 그 결과, 점음원의 경우 측정거리가 프로브를 구성하는 마이크로폰 사이의 간격보다 약 2.5배 이상 떨어진 거리에서 오차 1dB 이하의 정밀한 측정을 할 수 있었고, 유한 크기의 면음원의 경우, 면음원의 한 변의 길이가 0.02m이상일 때 근거리 음장의 측정오차가 크게 감소하기 시작하여, 한 변의 길이가 0.2m일 때 측정거리가 마이크로폰 사이의 간격보다 0.67배로 근접하여 측정하여도 1dB 이하의 정밀한 측정이 가능한 것으로 평가되어 이 프로브의 근거리 음장 측정의 유효성이 확인되었다. We studied an inherent error be caused by a measuring acoustic intensity using probe which can measure simultaneously the three-dimensional acoustic intensity. This three-dimensional intensity probe was constructed with four microphones, proposed by Suzuki et al. . In the computer simulation, we analyzed the nearfield measurement error with arbitary direction and each of axis direction on the ideal point source and the plate sound source which have finite size. From the results, in case of point source, we obtained accurate measurement below about 1dB when the distance of measurement was about 2.5 times with the distance among microphones in this probe. And in the case of plate sound source, the nearfield measurement error was decreased as the length of one side became above 0.02m, we obtained accurate measurement below about 1dB when the length of one side is 0.2m. The nearfield measurement error of finite size sound is small to ignore. Therefore this probe is useful to measure nearfield intensity.
Information Gathering by wireless camera node with Passive Pendulum Mechanism
Hideo Sato,Kuniaki Kawabata,Tsuyoshi Suzuki,Hayato Kaetsu,Yasushi Hada,Yoshito Tobe 제어로봇시스템학회 2008 제어로봇시스템학회 국제학술대회 논문집 Vol.2008 No.10
After the earthquake, it is very important to recognize the situation of the disaster area as soon as possible. Therefore, the objective of our research is to realize information gathering system applying wireless sensor network technology. This paper describes about development of a novel camera node for gathering the information and also experimental results by using the camera node via wireless multi-hop ad-hoc network. The wireless camera node consists of a small Linux embedded computer, a GPS adaptor, a CMOS camera with fish-eye lens and passive pendulum mechanism for maintain uniform posture of build-in camera passively. Thus, the wireless camera node can be set easily only to roll it up on the rough terrain. The developed node also can deliver gathered environmental information (video) to remote site by multi-hop transferring. It is experimented that the prototype can transfer the captured video information in the wireless ad-hoc network.
OVERVIEW OF RECENT EFFORTS THROUGH ROSA/LSTF EXPERIMENTS
HIDEO NAKAMURA,TADASHI WATANABE,TAKESHI TAKEDA,YU MARUYAMA,MITSUHIRO SUZUKI 한국원자력학회 2009 Nuclear Engineering and Technology Vol.41 No.6
JAEA started the LSTF experiments in 1985 for the fourth stage of the ROSA Program (ROSA-IV) for the LWR thermal-hydraulic safety research to identify and investigate the thermal-hydraulic phenomena and to confirm the effectiveness of ECCS during small-break LOCAs and operational transients. The LSTF experiments are underway for the ROSA-V Program and the OECD/NEA ROSA Project that intends to resolve issues in thermal-hydraulic analyses relevant to LWR safety. Six types of the LSTF experiments have been done for both the system integral and separate-effect experiments among international members from 14 countries. Results of four experiments for the ROSA Project are briefly presented with analysis by a best-estimate (BE) code and a computational fluid dynamics (CFD) code to illustrate the capability of the LSTF and codes to simulate the thermal-hydraulic phenomena that may appear during SBLOCAs and transients. The thermal-hydraulic phenomena dealt with are coolant mixing and temperature stratification, water hammer up to high system pressure, natural circulation under high core power condition, and non-condensable gas effect during asymmetric SG depressurization as an AM action.
Wireless camera nodes deployment by a teleoperated mobile robot for construction of sensor network
Hideo Sato,Kuniaki Kawabata,Tsubota Yugo,Hayato Kaetsu,Tsuyoshi Suzuki 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
The objective of our research is to develop a wireless sensor network construction system by teleoperatedmobile robot. Our proposed system is that mobile robot carries the sensor nodes and deploys them for constructingwireless network in the working environment. For deployment of the sensor nodes, we introduced to estimatemaintainable data transfer speed based on statistic approach. When estimated transfer speed is over required one, the operator can determine to place the sensor nodes and establish wireless sensor network. As the experimental result by prototype system with proposed method, it was confirmed that data transfer speed on constructed network could be maintained over required one.
Suzuki Hirofumi,Okino Tadashi,Yamamoto Yuji,Shibutani Hideo 한국광학기기산업협회 2006 光學世界 Vol.101 No.-
디지털카메라, 카메라폰, DVD 픽업 등의 수요가 증가하고 있고, 유리 성형 기술의 자동화가 진보하고 있기 때문에 유리 성형 프로세스의 동아시아 이전·전개가 진행되고 있다. 최근 동아시아에서도 단순한 축대칭비구면의 성형틀은 정밀가공이 가능해져, 더욱 부가가치가 높은 광학부품을 생산해내기 위해, 복잡형상 세라믹틀의 연삭가공기술의 개발이 반드시 필요하다. 그래서 본고에서는 마이크로 복잡형상 광학부품 성형틀의 초정밀 미세가공기술의 일부를 소개하겠다.