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Page 843 of 888 Results 8421 - 8430 of 8878

Tomáš Dresler, Jan Holub, Radislav Šmíd
VOICE TRANSMISSION QUALITY MEASUREMENT BASED ON WAVELET TRANSFORMATION

A new method for objective voice quality measurements is described in the article. It is based on wavelet transformation that enables intrinsically also time localisation of eventual impairments. In comparison with other methods (based on P.861 and P.862 algorithms), the described method saves about one half of operations needed for achievement of comparable results, thus saving computation power and time.

Isamu Kajitani, Nobuyuki Otsu, Tetsuya Higuchi
IMPROVEMENT OF MYOELECTRIC PATTERN CLASSIFICATION RATE WITH µ-LAW QUANTIZATION.

In order to realize a myoelectric-controlled multi-functional hand prosthesis, this paper proposes a method to improve the myoelectric pattern classification ability of a hand controller. By applying the proposed method of µ-LAW quantization, the pattern classification rate increased by 11.1% (averaged for five subjects) and by 15.5% (maximum), with a practical pattern classification rate of 97.8% being achieved.

Thomas Allevard, Eric Benoit, Laurent Foulloy
FUZZY GLOVE FOR GESTURE RECOGNITION

This paper presents an application of a fuzzy rule-based aggregation to a dataglove for the recognition of gestures. The fuzzy glove is a dataglove that has fuzzy sensor functionalities. The approach used for the definition of numerical to linguistic conversion, and for the definition of the sets of rules is discussed.

Kozo Ohtani, Mitsuru Baba
ULTRASONIC ROBOT EYE FOR SHAPE RECOGNITION EMPLOYING A GENETIC ALGORITHM

This paper describes an ultrasonic robot eye for shape recognition using ultrasound pressure data and a Genetic Algorithm. This type of robot eye has commonly used a Neural Network (NN) for shape recognition. However, a NN perform poorly when lacking learned data. In order to overcome this problem when using a NN, we here attempt to replace the NN with a Genetic Algorithm (GA). Unlike a NN, the GA can recognize shapes without depending on learned data. Experimental results demonstrate that the recognition ratios of the proposed ultrasonic robot eye using the GA are higher than that of a conventional ultrasonic robot eye using a NN. Therefore, it is shown that our robot eye is effective for many robotic applications.

Jaromír Volf, Josef Vlcek
SENSORS TO IMPROVE TIMBER BARKING – ROBOT INTELLIGENT BEHAVIOUR

Having been realized the Timber Barking Model Device with the Operational Dimensions, which used the new untraditional timber barking way – by means of the Electric Current Effects Passing through the Subcortical Layers, the number of Sensors have to be used, to be set the adaptive intelligent barking device on the robotized level. To be reached the successful timber barking - the key problem is the electric power controller’s setting with respect - first – to the subcortical layers quality (being changed in time); - second – with respect to the log’s cone; - third – with respect to the input (output) log’s diameter to (out) of the device. The other problem is timber – barking surface quality processing.

Shigenobu Muraoka
RECOGNITION OF SHAPE BY MEANS OF ACTIVE ANTENNA USING QUARTZ RESONATORS

This paper deals with the application of a quartz resonator to a force sensor installed into an active antenna for use in recognizing an environment. When the antenna makes contact with the environment, the force sensor can detect the contact force and the contact position. Shapes of a rectangular plate, a circular plate and a rectangular parallelepiped were recognized by the active antenna.

Yusuke Inoue, Ichirou Ishimaru, Gen Hashiguti
POSITION AND ATTITUDE MEASUREMENT FOR MICRO MANIPULATOR BY DIFFRACTED LIGHT PROVE

In the present study, we investigate the removal of extremely minute materials via a micro manipulator. This operation requires measurement and control of the position and attitude of the micro manipulator at a sub-micrometer level. Therefore, a miniature instrumentation sensor having six degrees-of-freedom is necessary. We devised a technology that measures the diffracted light from minute slits formed on the micro manipulator which enables the position and attitude to be measured in six degrees-of-freedom simultaneously using only one laser light.
In the present paper, we report the result of a trial production of minute slits formed by anisotropy etching at a high forming precision. We optimized the design of this minute slits based on Fraunhofer diffraction theory. In addition, we discuss the feasibility of the proposed technology as well as the experimental results of diffracted light distribution from these slits.

Davor Zvizdic, Lovorka Grgec Bermanec, Georges Bonnier, Eliane Renaot, Tomislav Veliki
UNCERTAINTY BUDGET OF PRESSURE BALANCE EFFECTIVE AREA DETERMINED BY COMPARISON METHOD

This paper presents a simplified model for the evaluation of the measurement uncertainty of pressure balance effective area calibrated by method of comparison which is being applied at Laboratory for Process Measurements (LPM). The methodology is applied for oiloperated industrial pressure balances in the gauge pressure range up to 60 MPa. The scope of the procedure is illustrated by calculation example.

Henryk Urzedniczok, Jan Zakrzewski
PRESSURE PULSE GENERATING SYSTEM FOR DYNAMIC CALIBRATION OF SILICON LOW RANGE PRESSURE SENSORS

The dynamic calibration of silicon pressure sensor and whole pneumatic part of the pressure transducers becomes an important problem in many applications. The known methods are not satisfactory for low range sensors. In this paper a simple system for short pulse pressure generation is described. A method for determination of frequency response based on pressure pulse signal is presented. The obtained results show that this method is simply for realisation and useful for low range silicon pressure sensors.

Luca Tomasi, Engelbert Wieser, Eju Baruah, David Collomb, Florent Jolly, Gehard Krötz, Stefan Storm, Peter Jänker, Ernst Obermeier
DEVELOPMENT OF A NEW PIEZOELECTRIC DYNAMIC PRESSURE GENERATOR FOR HIGH PRESSURE PERIODIC AND APERIODIC CALIBRATION

The need for dynamic pressure calibration has been increasing in the past years. Many solutions have been developed to satisfy this demand; nevertheless both present periodic and aperiodic systems do not cover the whole range of needs, calling for further development effort. In this contribution is presented a newly designed piezoelectric-actuated dynamic high-pressure calibration system that operates both periodically, 70·105 Pa peak-topeak at 300 Hz, and aperiodically, almost 50·108 Pa/s. Concept, design and first experimental results are described. First encouraging results foster further enhancement of performances.

Page 843 of 888 Results 8421 - 8430 of 8878