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Identification of Wrist EMG Signals using Dry Type Electrodes
Tadahiro Oyama,Hillary Choge,Stephen Karungaru,Satoru Tsuge,Yasue Mitsukura,Minoru Fukumi 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
Recently, researches of artificial arms and pointing devices using Electro Myo Gram(EMG) have been actively done. However, EMG is usually measured from a part with comparatively big muscular fibers such as arms and shoulders. Therefore, if we can recognize wrist motions using EMG which was measured from the wrist, the range of application will extend further more. However, when we use the wrist EMG, there are problems that the individual difference is large and its repeatability is low and soon. In this paper, we aim the construction of wrist EMG recognition system that is robust to these problems.
A Circle-Based Region-Of-Interest Segmantation Method for Palmprint Recognition
H. Kipsang Choge,Tadahiro Oyama,Stephen Karungaru,Satoru Tsuge,Minoru Fukumi 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
This paper presents a novel method for optimal Region-Of-Interest(ROI) segmentation for palmprint feature extraction based on the largest inscribed circle. This ensures that the optimal amount of features can be extracted, unlike square-based methods which exclude a substantial area on the outside region of the palmprint image. After position normalization, the middle portion of the palmprint is searched to determine the center from which the largest inscribed circle can be extracted. The circular area is then unwrapped into a fixed-size rectangular strip which is further preprocessed to remove redundancies and then split into seven equal square sub-images. A layered approach is then adopted during the matching stage where each square is successively matched and polled to produce a matching score. Experiments are performed using the "PolyU Palmprint Database" and results show that this is a viable method for palmprint feature extraction, with a recognition rate of above 90% obtained.
A Study on Synchronous Stability Analysis of Power System with a Large Amount of PVs
Yoshida, Mitsutaka,Tsuji, Takao,Oyama, Tsutomu,Hashiguchi, Takuhei,Goda, Tadahiro,Kihara, Hidemi,Nomiyama, Fumitoshi,Suzuki, Naoto The Korean Institute of Electrical Engineers 2012 The Journal of International Council on Electrical Vol.2 No.2
To solve the energy and environmental issues, it is planned that a large amount of photovoltaics (PVs) are introduced in Japan. However, because the characteristic of PV output is different from that of conventional generators, it is possible that the synchronous stability changes due to a large amount of PVs. Additionally, supposing that some generators are stopped when PV output becomes large, decrease of inertia constant and change of power flow are also important factors for synchronous stability. Hence, in this paper, the synchronous stability of power system with a large amount of PVs is studied considering both the voltage characteristic of PV output and the change of system operation such as unit commitment. Specifically, the stability is evaluated from a viewpoint of critical clearing time (CCT) based on both the accelerating and decelerating energy in P-${\delta}$ curve. IEEJ-WEST10 model system is utilized as a simulation model.