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151.
A human-machine cooperative system for generating sign language animation using thermal image 总被引:1,自引:1,他引:0
We propose a new approach aimed at sign language animation by skin region detection on an infrared image. To generate several
kinds of animations expressing personality and/or emotion appropriately, conventional systems require many manual operations.
However, a promising way to realize a lower workload is to manually refine an animation made automatically with a dynamic
image of real motion. In the proposed method, a 3D CG model corresponding to a characteristic posture in sign language is
made automatically by pattern recognition on a thermal image, and then a person’s hand in the CG model is set. The hand part
is made manually beforehand. If necessary, the model can be replaced manually by a more appropriate model corresponding to
training key frames and/or the model can be refined manually. In our experiments, a person experienced in using sign language
recognized the Japanese sign language of 71 words expressed as animation with 88.3% accuracy, and three persons experienced
in using sign language also recognized the sign language animation representing three emotions (neutral, happy and angry)
with 88.9% accuracy.
This work was presented in part at the 13th International Symposium on Artificial Life and Robotics, Oita, Japan, January
31–February 2, 2008 相似文献
152.
Design method for a new control system for an autonomous underwater vehicle using linear matrix inequalities 总被引:1,自引:0,他引:1
Yohei Nasuno Etsuro Shimizu Masanori Ito Ikuo Yamamoto Satoshi Tsukioka Hiroshi Yoshida Tadahiro Hyakudome Shojiro Ishibashi Taro Aoki 《Artificial Life and Robotics》2007,11(2):149-152
The independent administrative corporation Japan Agency for Marine–Earth Science and Technology (JAMSTEC) has developed a
small light autonomous underwater vehicle (AUV) named marine robot experimental 1 (MR-X1).1 The motion control of MR-X1 is considered in this article. Since the dynamics of MR-X1 mainly depends on its own speed, the motion control is a nonlinear control system. We propose a new controller design method
for this system using linear matrix inequalities (LMIs). This algorithm gives a solution as a linear matrix inequality, and
can be adapted to solve many LMIs simultaneously. LMIs can be obtained by substituting several speeds into the dynamics of
the MR-X1. The proposed controller, which can be derived from the solution of the LMIs, was adapted to MR-X1 and showed good performance in experiments.
This work was presented in part at the 11th International Symposium on Artificial Life and Robotics, Oita, Japan, January
23–25, 2006 相似文献
153.
Bin Fu Feifei Zhang Masanori Ito Yoshitaka Watanabe Taro Aoki 《Artificial Life and Robotics》2008,13(1):45-49
In those days, the performance of underwater robot is improving because requirements for it are becoming higher and more complex
than before. For those work, a highly precise and wide regional underwater positioning system is indispensable. However, the
conventional positioning system that has three standard stations, is applicable for the field with no obstacle, because its
principal depends on the time based measurement. Therefore, we developed a new underwater positioning system based on sensor
network technology that is using a lot of standard stations equipping hydrophone and GPS sensor on the water surface. And
decreasing the cost of sensor, we applied a simple method for measurement of distance, which is using sound power level. Therefore,
this study has started with confirming the new principal for underwater positioning method. This paper is showing the availability
with theoretical analysis and the performance of new method under the noise and reflection of sound in the water, and suggestions
for the measures and an error compensation method.
This work was presented in part at the 13th International Symposium on Artificial Life and Robotics, Oita, Japan, January
31–February 2, 2008 相似文献
154.
In recent years, there has been a great deal of interest in distributed generation from viewpoints of environmental problems and energy saving measures. Thus, a lot of distributed generators will be connected to the distribution network in the future. However, increase of distributed generators, which convert natural energy into electric energy, raises concerns as to their adverse effects on the distribution network. Therefore, control of distribution networks using Flexible AC Transmission System (FACTS) devices is considered in order to adjust the voltage profile, and as a result more distributed generations can be installed into the networks. In this paper, four types of FACTS devices— Static Synchronous Compensator (STATCOM), Static Synchronous Series Compensator (SSSC), Unified Power Flow Controller (UPFC) and self‐commutated Back‐To‐Back converter (BTB)— are analyzed by comparison of required minimum capacity of the inverters in a residential distribution network with a large penetration of photovoltaic generations. © 2008 Wiley Periodicals, Inc. Electr Eng Jpn, 165(3): 16– 28, 2008; Published online in Wiley InterScience ( www.interscience.wiley.com ). DOI 10.1002/eej.20499 相似文献
155.
Yoshimasa Takahashi Itaru Ashida Shigeo Arai Kimitaka Higuchi Yuta Yamamoto Shunsuke Muto 《International Journal of Fracture》2018,209(1-2):223-229
In this study, we have investigated microstructures of the delamination cracks observed from tensile and fracture toughness test specimens using an API X70 pipeline steel. It is found that the delaminations observed from both tensile and toughness specimens are intergranular fractures. At the occurrence, characteristics of brittle fracture were observed, but it was found not to be a brittle fracture as the delaminations were induced by plastic deformation. It is shown that severe plastic deformation produced strain concentration around particles located along grain boundaries and caused decohesion between adjacent grains, resulting in intergranular fracture. 相似文献
156.
Sugiyama Y. Nakata Y. Muto S. Futatsugi T. Yokoyama N. 《IEEE journal of selected topics in quantum electronics》1998,4(5):880-885
Spectral-hole burning of InAs self-assembled quantum dots (QDs) embedded in pin-diode was observed. At 5 K, a narrow hole with width of less than 1 mm was observed and the hole depth increased as electric field increased with the writing light power of 8 mW. The hole was observed up to 40 K. The spectral hole was broadened as the writing light power increases from 8 to 20 mW. Spectral-hole width at the 8 mW was well fitted with the convolution integral of Gaussian distribution for reading light and Lorentzian distribution for absorption change taking into account homogeneous broadening of InAs QDs of ⩽80 μeV. Spectral-hole lifetime at the 8 mW was estimated to be in the order of 10-6 s. Optical absorption spectrum of 15-stacked InAs QD structure was also observed at 77 K and 300 K 相似文献
157.
We studied the hypothesis that synaptic dynamics is controlled by three basic principles: (1) synapses adapt their weights so that neurons can effectively transmit information, (2) homeostatic processes stabilize the mean firing rate of the postsynaptic neuron, and (3) weak synapses adapt more slowly than strong ones, while maintenance of strong synapses is costly. Our results show that a synaptic update rule derived from these principles shares features, with spike-timing-dependent plasticity, is sensitive to correlations in the input and is useful for synaptic memory. Moreover, input selectivity (sharply tuned receptive fields) of postsynaptic neurons develops only if stimuli with strong features are presented. Sharply tuned neurons can coexist with unselective ones, and the distribution of synaptic weights can be unimodal or bimodal. The formulation of synaptic dynamics through an optimality criterion provides a simple graphical argument for the stability of synapses, necessary for synaptic memory. 相似文献
158.
Optimal spike-timing-dependent plasticity for precise action potential firing in supervised learning
In timing-based neural codes, neurons have to emit action potentials at precise moments in time. We use a supervised learning paradigm to derive a synaptic update rule that optimizes by gradient ascent the likelihood of postsynaptic firing at one or several desired firing times. We find that the optimal strategy of up- and downregulating synaptic efficacies depends on the relative timing between presynaptic spike arrival and desired postsynaptic firing. If the presynaptic spike arrives before the desired postsynaptic spike timing, our optimal learning rule predicts that the synapse should become potentiated. The dependence of the potentiation on spike timing directly reflects the time course of an excitatory postsynaptic potential. However, our approach gives no unique reason for synaptic depression under reversed spike timing. In fact, the presence and amplitude of depression of synaptic efficacies for reversed spike timing depend on how constraints are implemented in the optimization problem. Two different constraints, control of postsynaptic rates and control of temporal locality, are studied. The relation of our results to spike-timing-dependent plasticity and reinforcement learning is discussed. 相似文献
159.
In this paper, we discuss the potential of force perception technologies for realizing hand-held devices in the field of social
systems. We propose and develop an interactive force-sensation-based navigation system for waiters based on a force perception
technology that we have proposed. The navigation system consists of our new hand-held haptic interface and a camera-based
position and posture identification system. Since the proposed compact haptic interface does not require external grounding,
it can be used outside the laboratory and does not interrupt human activity. We verify the feasibility of the system in trials
where we collected the responses of system users. 相似文献
160.
H. Nakane K. Yamane Y. Muto N. Miyamoto H. Adachi 《Journal of the Society for Information Display》2000,8(3):237-240
Abstract— The stability and uniformity of the emission current of FEAs are important parameters in determining their viability for display applications. The electron emission from an FEA was magnified by using an emission microscope, and the stability of the individual microtips was increased. The number of observable microtips increased when the total emission current of the FEA was considered, and it approached 90%. Some of the microtips showed unstable emission and the number of such unstable microtips increased when the total emission current was increased. Gas molecules adsorbed locally on the top of the tip were moved by ion bombardment, for which the emission current should be varied. 相似文献