In psychophysics as well as in sensory physiology, the response amplitude R is often a power function of the stimulus intensity S over a wide range of S (i.e. R = aS(k);a = constant). In vision, there is a recent repo...
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In psychophysics as well as in sensory physiology, the response amplitude R is often a power function of the stimulus intensity S over a wide range of S (i.e. R = aS(k);a = constant). In vision, there is a recent report that such a power relationship ('square root intensity coding" if k = 0.5) may arise as early as at the cone photoreceptor level if the stimulus is a narrow slit of light. A simple model is presented here to account for this finding: strong electrical coupling with several neighboring cones can act to expand the dynamic range of the impaled cone in such a way as to produce a square root coding region for the responses to fine visual objects such as small spots and narrow slits.
There are many examples of enzymes that share substrates or cofactors in a cyclic manner. Techniques have been developed that use cyclic enzyme systems to assay quantitatively small amounts of biochemical substances (...
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There are many examples of enzymes that share substrates or cofactors in a cyclic manner. Techniques have been developed that use cyclic enzyme systems to assay quantitatively small amounts of biochemical substances (cofactor, substrate), however, only a few studies of the control of these systems have been published. The author previously showed with computer simulations that cyclic enzyme systems have the reliability of ON-OFF types of operation (McCulloch-Pitts' neuronic equation) capable of storing short-memory, and the applicability for a switching circuit in a biocomputer. This paper introduces a unique switching mechanism of cyclic enzyme system (basic switching element), and next, building the integrated biochemical switching system being composed of the basic switching element, shows the physiological phenomenon termed 'selective elimination of synapses' generally produced as a result of low-frequency train of electrical stimuli to the synapses.
The characteristics between a set of alternating-polarity ring magnets and a superconductor are studied. The magnets have strong repulsion and attraction forces with the superconductor owing to the pinning effect. Usi...
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The characteristics between a set of alternating-polarity ring magnets and a superconductor are studied. The magnets have strong repulsion and attraction forces with the superconductor owing to the pinning effect. Using these characteristics a prototype of a superconducting journal bearing with a magnet shaft supported by a cylindrical housing has been developed. The superconducting journal bearing consists of a superconducting housing with four high T(c) superconductors (type-II superconductors) and a magnet shaft as the rotor of alternating-polarity ring magnets of the same size. The magnet shaft can be levitated in the centre of the housing without contact. Levitation and drag forces of the superconducting journal bearing are investigated. The levitation force shows circular hysteresis loops depending on the displacement because of the flux pinning effect. Owing to the simple and useful structure of the superconducting journal bearing it is applicable to practical devices in the industrial field.
Design of a diagnostic technique used in an intelligent support system for artificial heart control is presented. Parameters which may cause abnormal variables of the recipient of artificial hearts are searched with t...
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ISBN:
(纸本)0780307852
Design of a diagnostic technique used in an intelligent support system for artificial heart control is presented. Parameters which may cause abnormal variables of the recipient of artificial hearts are searched with the use of a large dynamic model Human. The advantage of this technique is that candidates of abnormal parameters can be pointed out avoiding real-time parameter estimation whose results would be unreliable for the large scale model.
A new state estimation method for an energy stochastic system with decibel observation mechanism is presented. The problem here is to get a decibel-valued estimate of an energy state variable by using the decibel-valu...
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Shape recovery from a monocular image with errors is addressed. Shape recovery necessitates the use of additional plausible constraints on typical structures and features of the objects in an ordinary scene. We propos...
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There is a need for highly redundant manipulators to work in complex, cluttered environments. We explore kinematics and path planning for highly redundant, manipulators by means of a continuous manipulator model, whic...
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In this paper, we propose a syntactic pattern recognition method for non-schematic drawings, based on a new attributed graph grammar with flexible embedding. In our graph grammar, the embedding rule permits the nodes ...
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A state estimation method for an energy stochastic system with a decibel observation mechanism is presented. The problem is to get a decibel-valued estimate of an energy state variable by using the decibel-valued nois...
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A state estimation method for an energy stochastic system with a decibel observation mechanism is presented. The problem is to get a decibel-valued estimate of an energy state variable by using the decibel-valued noisy observation data, where the stochastic system of concern is physically driven on energy scale. The main attention is paid to matching between the physical energy principle and the decibel observation mechanism on the human evaluation side. The present estimation method is based on an expansion form of the Baye's theorem, and any kinds of statistics can be estimated. The effectiveness of the theory has been confirmed by application to room acoustics data.< >
A type of miniature linear actuators called a cybernetic actuator for biomedical applications is described. This actuator has four driving states: free, increasing, decreasing, and lock. The free and lock states can r...
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A type of miniature linear actuators called a cybernetic actuator for biomedical applications is described. This actuator has four driving states: free, increasing, decreasing, and lock. The free and lock states can release excessive applied load from outside to provide safety characteristics for both human and micromechanisms. Miniaturized linear cybernetic actuators combining a piezoelectric impact drive with electromagnetic clamping were designed and developed. Feasibility and basic performance of the actuators were confirmed by theory and experiments. Improved performance in terms of maximum speed, energy efficiency, and silent drive as a miniature linear actuator were verified successfully by using a controlled friction impact drive.< >
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