[in Japanese]

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Europium doped garnet (Eu:YAG) crystals have been grown and evaluated for application in the temperature sensing device. Photoluminescence peaking around 600 nm and 700 nm are observed from Eu:YAG specimens. Both PL intensity and PL lifetime vary with Eu concentration of the crystals. Eu concentration of 3 at % is found to be the most suitable due to strong PL intensity. PL life time of Eu:YAG crystal varies with temperature.

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Thermal radiation from rare-earth doped silica fibers were studied for the fiber-optic thermometer application. Thermal radiation similar to the black body radiation was observed in visible light region from the rare-earth doped fibers. Visible light radiation peaks of rare-earth ions were clearly observed in the rare-earth doped silica fibers. Intensity ratio of thermal radiation at different wavelength is suitable for the high temperature measurement.

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Temperature measurement technique using the phosphor sensor sheet was developed. The phosphor sensor sheet was compounded of powdery phosphor and silicone resin. Optical property and temperature dependence of the phosphor sensor sheet was evaluated by telemetry for the thermometer application.

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[in Japanese]

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FT-IR is used by various research laboratories. It is necessary and indispensable in the analysis equipment. OCDMIRS(Optical Coherence Domain Mid-Infrared Spectroscopy) is an advenced technology of FT-IR that introduces the idea of OCDR(Optical Coherence Domain Reflectmetry). It is possible in OCDMIRS though it is impossible in conventional FT-IR to acquire qualitative and the existence location information of the material of the living body etc.In this paper, the measurement result of the multilayer sample by OCDMIRS was shown, and the possibility of achievement was examined.

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[in Japanese]

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This article propose a method for information compression of bird songs in water sites to discreminate bird species by using a discrete wavelet transform. By using a neural network, the effectivinese of the proposed method is made clear through the result of classification esperiments with collected 7 kinds of the bird songs.

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This paper presents the results of computer simulations on performance enhancement of the previously proposed 2D-image reconstruction system in computed tomography based on the non-uniform sampling theorem. For sensitivity reduction of the system to additive noises, an automatic exraction of spatial frequency spectrum, whose amplitude is superior to the noise level in high frequency, is proposed. The special features and effectiveness of the extraction are made clear through illustrations.

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[in Japanese]

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Respond to growing interest in electromagnetic human exposure, the guideline and the standards including the measurements have been developed.We therefore developed a magnetic field meter considering the guideline and the standards.

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[in Japanese]

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Electrical impedance measurement was applied to eucalyptus seedlings to establish a method to nondestructively monitor a water status of a plant body. The measured capacitance decreased and the measured resistance increased as the plant body was dehydrated. The capacitance and resistance have been related to a water content and water potential of the plant.

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[in Japanese]

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[in Japanese]

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The visible PL with broad peak at wavelength of 462 nm are observed from polished rice, flour and corn starch under illumination of ultra-violet (UV) light. PL peaking at 462 nm is excited effectively with UV light at 365 nm. Peak intensity is found to vary with the source and the breed of the rice specimens. PL images from rice also reveal the uniformity of the rice products. Two-dimensional images of PL, which revealed the uniformity of rice under UV irradiation, are potentially useful for the evaluation and the quality control of the rice products.

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[in Japanese]

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By measuring the impedance of cells that were cultured on an electrode, the various changes of the cells can be measured non-invasively in real-time.

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Recent environment of the urban area of Sendai City has changed year by year due to rapid urbanization. This paper describes the results of investigations that analyzed the remotely sensed infrared image of Izumi-Ku, Sendai City, taken by satellite for 12 years. Typical result is shown about the speed of urbanization in reducing the green area.

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[in Japanese]

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SICE, Society of Instrument and Control Engineers, have a certification system as SICE Engineers of Measurement and Control. About 200 engineers have been certificated in these 8 years. This paper present a status and a direction of the system.

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[in Japanese]

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It is known well that the adaptive sliding mode control can stabilize linear systems with matching uncertainties bounded by unknown constants.However, because an ideal sliding mode doesn't exist, an adaptiveparameter might be diverged. In this text, the boundary layer that depended on the state is taken,and making the control input continuous is aimed at. And, it proposesthe technique for switching the adaptive law based on the slidingvariable. The proposed method avoids chattering in the origin neighborhood bypreventing chattering in a global state space, and preventing theadaptive law being diverged.

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This paper presents a new design method for robsut control. The model error is compensated for both gain and phase. The better control performance is obtaind.

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[in Japanese]

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We consider state reset systems in which some elements are reset to zero if they satisfy a condition and show boundedness od the state. We modify general linear systems to observable canonical forms in order to apply results on state boundedness in the case of observable canonical forms to general linear systems.

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Various practical systems include time delays due to measurement and computational delays, and transmission and transport lags. In this paper, the authors improve a state predictor for a certain class of multivariable systems including multiple output delays by giving the freedom for gain adjustments. Robust stability of the improved predictor is analyzed using the distance to instability of the state transition matrix of the predictor.Moreover, a stability region in the gain-dead time plane is derived for a regulator system using the improved predictor.Numerical examples illustrate the superiority of the improved predictor to the previous predictor.

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[in Japanese]

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In order to improve the control performance in a servo system, we have introduced a concept called an equivalent input disturbance, which is a signal input on the control input channel that produces the same effect on the controlled output as the disturbances do, and have devised a method of designing a new type of servo system, in which an equivalent input disturbance is estimated and incorporated into the control law. In this paper, this method is applied to the control of a two-mass system to demonstrate its validity. Specifically, the relationship between the characteristics of the filter in the disturbance estimation and the disturbance rejection performance is analyzed. In addition, some design guidelines for the low-pass filter are presented.

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Stability of two-dimensional(2-D) systems in the Fornasini-Marchesini model is studied by means of functional Riccati matrix inequalities posed on the unit circle. A method to evaluate stability margins of 2-D systems is proposed as an iterative method to find piecewise constant solutions to the functional Riccati matrix inequalities. This method is useful in checking an asymptotic stability of 2-D systems and some necessary stability level. An efficient design method is developed for computing the stable 2-D IIR digital filters based on the proposed stability condition.

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[in Japanese]

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A dynamic reconfigurable device is a device which can change its function dynamically. When we use such a device to process tasks, we need a scheduling algorithm with dynamic selections of configurations and reconfiguration timing. In this paper, we model non-preemptive execution of periodic tasks on a dynamic reconfigurable device by a hierarchical timed discrete event system and propose such a scheduling by applying state feedback control.

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In this paper, we present a new method for large-scale traffic network control. First of all, we formulate, based on the Mixed Integer NonLinear Programming (MINLP) problem, the traffic network control system that is one of typical hybrid systems with nonlinear dynamics. We use general performance criteria for traffic network control and show that although the problem contains non-convex constraint functions as a whole, the generated sub-problems are always included in the class of convex programming problem.

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This paper develops an attitude control system of unmanned vehicle operating at a low speed. We firstly propose a non-analytical but effective self-organizing modeling method that system dynamics of interest are constructed in a polynomial affine formation with high granularity. We also present the application of the proposed modeling method by adopting hybrid affine system formulation where an entire control task is realized in piecewise affine manner satisfying all the requirements.

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Programmable Logic Controllers (PLCs) have been widely used in industrial world.This class of systems is characterized by its use of low-resolution (typically ON/OFF) sensors and actuators.In PLC-based control systems, the design of sensor parameters is crucial since not only the output of the plant but also the parameters determine ON/OFF of the sensors, and the parameters finally affect to the overall control performance.In this paper, firstly, the method that transforms PLC-based control systems into hybrid automata is presented.Here, the sensor parameter design problem can be formulated as the optimal design of guard conditions in hybrid automata.Secondly, the optimal design method of guard condtions is proposed.Finally, the usefulness of the proposed method is demonstrated through a numerical example.

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