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GPR Development for Landmine Detection
Sato, Motoyuki,Fujiwara, Jun,Feng, Xuan,Zhou, Zheng-Shu,Kobayashi, Takao Korean Society of Earth and Exploration Geophysici 2005 지구물리와 물리탐사 Vol.8 No.4
Under the research project supported by Japanese Ministry of Education, Culture, Sports, Science and Technology (MEXT), we have conducted the development of GPR systems for landmine detection. Until 2005, we have finished development of two prototype GPR systems, namely ALIS (Advanced Landmine Imaging System) and SAR-GPR (Synthetic Aperture Radar-Ground Penetrating Radar). ALIS is a novel landmine detection sensor system combined with a metal detector and GPR. This is a hand-held equipment, which has a sensor position tracking system, and can visualize the sensor output in real time. In order to achieve the sensor tracking system, ALIS needs only one CCD camera attached on the sensor handle. The CCD image is superimposed with the GPR and metal detector signal, and the detection and identification of buried targets is quite easy and reliable. Field evaluation test of ALIS was conducted in December 2004 in Afghanistan, and we demonstrated that it can detect buried antipersonnel landmines, and can also discriminate metal fragments from landmines. SAR-GPR (Synthetic Aperture Radar-Ground Penetrating Radar) is a machine mounted sensor system composed of B GPR and a metal detector. The GPR employs an array antenna for advanced signal processing for better subsurface imaging. SAR-GPR combined with synthetic aperture radar algorithm, can suppress clutter and can image buried objects in strongly inhomogeneous material. SAR-GPR is a stepped frequency radar system, whose RF component is a newly developed compact vector network analyzers. The size of the system is 30cm x 30cm x 30 cm, composed from six Vivaldi antennas and three vector network analyzers. The weight of the system is 17 kg, and it can be mounted on a robotic arm on a small unmanned vehicle. The field test of this system was carried out in March 2005 in Japan.
Motoyuki Sato,Jun Fujiwara,Xuan Feng,Zheng-Shu Zhou,Takao Kobayashi 한국지구물리탐사학회 2005 지구물리와 물리탐사 Vol.8 No.4
일본 문부과학성의 연구 지원하에 지뢰 탐지를 위한 GPR 시스템 개발에 관한 연구를 수행하였다. 2005 년도 까지 두 종류의 새로운 지뢰탐지 GPR 시스템 원형의 개발을 완성하였으며 이를 ALIS (Advanced Landmine Imaging System)와 SAR-GPR (Synthetic Aperture Radar – Ground Penetrating Radar)이라고 명명하였다. ALIS는 금속탐지기와 GPR을 결합한 새로운 형태의 휴대용 지뢰탐지 시스템이다. 센서의 위치를 실시간으로 추적하는 시스템을 장착하여 센서 에 감지된 신호를 실시간으로 영상화할 수 있도록 하였으며, 센서 위치의 추적은 센서의 손잡이에 장착한 CCD 카메라 만을 이용하여 가능하도록 고안하였다. 그리고 GPR과 금속탐지기 신호를 CCD 카메라에 포착된 영상에 중첩하여 동시 에 영상화하도록 설계하였기 때문에 매설된 탐지 목적물을 용이하게 그리고 신뢰할 만한 수준으로 탐지하고 구별할 수 있다. 2004 년 12월에 아프가니스탄에서 ALIS의 현장 검증 실험을 수행하였으며, 이를 통해 이 연구에서 개발한 시스템 을 이용하여 매설된 대인지뢰를 탐지할 수 있을 뿐만 아니라 대인지뢰와 금속 파편의 구분 또한 가능함을 보였다. SARGPR은 이동 로보트에 장착한 지뢰탐지 시스템으로 GPR과 금속탐지기 센서로 구성된다. 다수의 송, 수신 안테나로 구성 된 안테나 배열을 채택하여 개선된 신호처리 기법의 적용을 가능하며, 이를 통해 좀 더 나은 지하 영상의 획득이 가능하 다. SAR-GPR에 합성개구 레이다 알고리듬을 채용함으로써 원하지 않는 클러터(clutter) 신호를 억제하고 불균질도가 높 은 매질 내부에 매설된 목적물을 영상화할 수 있다. SAR-GPR은 새로이 개발한 휴대용 벡터 네트워크 분석기를 이용한 스텝 주파수 레이다 시스템(stepped frequency radar system)으로 6 개의 Vivaldi 안테나와 3 개의 벡터 네트워크 분석기 로 구성된다. SAR-GPR의 크기는 30 cm × 30 cm × 30 cm, 중량은 17 kg 정도이며 소형 무인 차량의 로보트 팔에 장 착된다. 이 시스템의 현장 적용 실험은 2005 년 3 월 일본에서 성공적으로 실시된 바 있다.
Improvement in the Super Low Core-loss Soft Magnetic Materials
Maeda Toru,Sato Atsushi,Mochida Yasushi,Toyoda Haruhisa,Mimura Koji,Nishioka Takao 한국분말야금학회 2006 한국분말야금학회 학술대회논문집 Vol.2006 No.1
We reported a P/M soft magnetic material with core loss value of , which is lower than that of 0.35mm-thick laminated material, by using high purity gas-atomized iron powder. Lack of mechanical strength and high cost of powder production are significant issues for industrial use. In order to achieve both low core loss and high strength by using inexpencive powder, the improvement of powder shape and surface morphology and binder strength was conducted. As the result, the material based on water-atomized powder with 80 MPa of TRS and 108 W/kg of core loss (W10/1k) was achieved.
Consensus Control of Multi-agent Systems Over Undirected Graphs with Quantized Signal Communication
Takumi Furusaka,Takao Sato,Nozomu Araki,Yasuo Konishi 제어로봇시스템학회 2018 제어로봇시스템학회 국제학술대회 논문집 Vol.2018 No.10
This study proposes a new design method for the consensus control of multi-agent systems with quantized signal communication. When the static quantizer used, the performance of the consensus control is deteriorated depending on the quantizing level. In a conventional method, the quantization is implemented the probability function. On the other hand, in the proposed method, the dynamic quantizer is introduced, and it is optimally designed. As a result, the consensus control performance is improved. Finally, the effectiveness of the proposed method is demonstrated through numerical examples.
Design of a Performance-driven One-parameter Tuning Controller
Shin Wakitani,Toru Yamamoto,Takao Sato 제어·로봇·시스템학회 2020 International Journal of Control, Automation, and Vol.18 No.6
The properties of most real systems vary every moment. For such systems, performance-adaptive control systems, which assess current control performance and tune their controller based on the assessment, are effective. This paper proposes a one-parameter tuning method as one of design methods of the performance-adaptive control systems. When the current control performance is diagnosed as being poor, the conventional performance-adaptive control systems redesign their controllers using the results of system re-identification. However, the system has a risk that the redesigned controller may cause further deterioration of the control performance depending on the identification accuracy of the estimated parameters. In the proposed method, the controller has a unique userspecified adjustable parameter. The controller can improve the control performance by adjusting only the parameter. However, only if the desired control performance cannot be maintained by adjusting the parameter because of drastic changes in the controlled object, the control system redesigns the controller using the estimated system parameters. Thanks to this strategy, the number of controller redesigns using the estimated system parameters is decreased when compared to the conventional performance-adaptive control system. It can also reduce the risk of further deterioration of the control performance because of the controller redesign. The effectiveness of the proposed method is evaluated by simulations and application to a weigh feeder that is one of food process systems.
Promotion of Blood Fluidity by Inhibition of Platelet Adhesion Using Electroacupuncture Stimulation
Shintaro Ishikawa,Makoto Murai,Takao Sato,Masataka Sunagawa,Erika Tokita,Steven K.H. Aung,Kazuhito Asano,Tadashi Hisamitsu 사단법인약침학회 2011 Journal of Acupuncture & Meridian Studies Vol.4 No.1
Stress applied to rats is known to result in a quick decrease in blood fluidity. Although electrical acupuncture stimulation (ACU) attenuates stress responses,the influence of ACU on blood fluidity has not been well examined. In the present study, the effect of ACU on blood fluidity and platelet adhesion was examined using a Micro Channel Array Flow Analyzer and a laser scattering platelet aggregometer (PA-20), respectively. Male Wistar rats (7−8 weeks old) were used. ACU (1 Hz, 3−5 V),which causes slight muscle twitching, was applied to acupoints for 60 minutes/day once or on 2 consecutive days. Stimulated acupoints were as follows: ZuSanli (ST-36), Sanyinjiao (SP-6), Hegu (L-I4), Neiguan (P-6), and Shenshu (BL-23). ACU applied to ST-36, SP-6, and L-14 revealed significant increases in blood fluidity while platelet adhesion activity decreased. No significant changes were observed when ACU was applied to P-6 and BL-23. Results indicate that ACU affects blood fluidity depending on the acupoints. Blood fluidity changed with ACU within 1 day. In other words, the effect of acupuncture has an immediate effect. In addition, platelet aggregation decreased with ACU, suggesting that an increase in blood fluidity is associated with platelet aggregation ability.
SINGLE-CHIP IMPLEMENTATION OF MPEG2 DECODER DEDICATED TO MP@HL
Masaki,Toshihiro,Morimoto,Yasuo,Sato,Yoh,Onoye,Takao,Shirakawa,Isao 대한전자공학회 1995 ICVC : International Conference on VLSI and CAD Vol.4 No.1
A single-chip MPEG2 decoder dedicated to MP@HL is described, which consists of specific functional units, macroblock level pipeline buffers, and sequence controller. Owing to the sophisticated I/O interface facilities among functional units, macroblock level pipeline buffers are successfully incorporated with functional units. A new organization for frame memory and its interface is also devised. The designed decoder contains K transistors, and occupies 81.0㎟ with a 0.6㎛ triple-metal CMOS technology.