In this study, the temperature and displacement of printed circuit board (PCB) due to heat of mounted parts were measured by using a thermographic video system and a holographic interferometry measuring system. The relationship between temperature and displacement was studied from the experimental results. As the results, the temperature and displacement on the PCB surface have been influenced with heat of mounted components due to current flow. The distribution of temperature showed some different relationships with the characteristics of the deformation. Therefore, the holographic pattern testing method may be useful in analysis of the detailed thermal stress evaluation of PCB surface and mounted parts.
Unlike printed character, the recognition of Hand Written one has various kinds of difficulties due to the existence of the huge pattern associated with the person who writes. Therefore, in general, recognition of Hand Written characters requires an algorithm which takes into consideration of the individual differences. Hangul characters are bassically made of straight lines and circles. They can be represented in terms of feature parameters such as the end point of the straight line, the length and the angle. Then all Hangul characters can be represented by the number of basic segments (_??_) multiplied by the feature parameters respectively. In this study we propose a method for recognizing Hand Written Hangul characters in terms of fuzzy inference. The recognition rate of proposed method for Hand Written Hangul characters shows 80% for 150 characters.
Improvement is discussed on a method of designing a window with the feature of minimizing the highest sidelobe level under desired mainlobe bandwidth and sidelobe fall-off. A previous paper by one of the authors has proposed a method with the above feature. But it has a problem that designed windows are discrete-time ones defined on a series of sampling points in the observation domain. Discrete-time windows need to be designed whenever the number of the sampling points is changed. The present method employs a C-spline function in expressing a continuous-time window. Experiments result in that the present method can design windows with dimension 30 which are as good as or better than the ones designed by the previous method with dimension 64 or more. It is also shown that the present design examples are superior to the authors' other windows expressed by C-spline functions.
The new coordinate calculation model of a two dimensional large scale laser digitizer with a cordless cursor is proposed. By using previous coordinate calculation model, an easiness of setting the devices and a high accuracy of a measurement were provided(2).In this paper, a new calculation model is proposed, which is designed in consideration of the other large error factor in addition to the previous error factors of model. By using this model, the devices are installed in the simpler way and the coordinate accuracy can be higher.
It has been speculated that the circulatory system is equivalent to the electric circuit (four-factor concentrated constant circuit modol). A noninvasive simple method for measurement of the circulatory parameters by analysing the radial pulse waveform based on the arterial model has been developped. A new approximate method calculates the parameters of the four-factor concentrated constant circuit model from the radial pulse waveform and the stroke volume. The radial pulse waveform was picked up by tonometry sphyngomanometer and stroke volume was obtained by another device (Korotkov sound recorder). The calculated circulatory parameters by the new method before and after sympathetic beta-blockade corresponded well with the supposed changes of the parameters.
In this paper, we describe an automatic system for high speed three dimensional objects recognition using the fiber grating vision sensor which has been developed by our group. This sensor utilizes the fiber grating plate as a pattern projection device and three dimensional shape measuring algorithm is based on the active triangulation. This sensor is so small and light that it could be installed on a robot hand directly. First, in order to recognize three dimensional objects, we obtain the range data by using this vision sensor. We recognize the size and position of spherical objects as three dimensional objects which are placed in disorder.
Oil/Water interface was formed across a micropore constructed by semiconductor technology. Nitrobenzen was used as oil phase, and 5mM CTAB was used as water phase. By using the pore, remarkably stable potential oscillations of a lipid membrane were obtained. Resting potential, amplitude and period of oscillation were observed to be stable for more than 120hours. In this paper, we applied this self-excited potential oscillation device as chemical sensor, and report the effect of chemical substance added into the water phase. The effect of taste stimulants added to the water phase with CTAB was investigated as a model for the biological chemoreceptive membranes. Magunesium sulfate, saccharose, citric acid, potassium chloride glutamic acid monosodium salt were chosen as bitter, sweet, sour, salty and umami substances, respectively. Frequency characteristics were examined by FFT to determine fundermental frequency accurately. The experimental results with microscopic observation show that the sensing system using the micropore can distinguish different chemical substances as well as their concentrations, suggesting its application to a chemical sensor. It was found that waveshapes response of chemical substance added to the water phase was correspondent to the condition of aggregated lipid around a micropore.