• Transactions of the Korean Society of Mechanical Engineers A
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• v.28 no.4
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• pp.386-393
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• 2004

In this paper, the ultrasonic attenuation coefficient was measured by variation of crack length for double-cantilever beam(DCB) specimen. The energy release rate, G, was obtained by the experimental measurement of compliance. The experimental results represents that the crack length for the ultrasonic attenuation coefficient and energy release rate is increases proportionally From the experimental results, we proposed a detecting method of the crack length by the ultrasonic attenuation coefficient and discussed it.

• International Journal of Air-Conditioning and Refrigeration
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• v.11 no.1
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• pp.10-16
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• 2003

The present study performs an experimental measurement on transient thermal response of an air-conditioned space by a variable air volume (VAV) system with a PI(pro-portional-integral) control logic. A thermal chamber with a PI controlled VAV unit is constructed to verify the previously suggested stratified multi-zone model. The effects of thermal parameters and control parameters such as supply air temperature and PI control factor are investigated by implementing the thermal chamber test. The experimental results obtained show that transient behavior of the air-conditioned space-temperature is in good accordance with the simulation results of the stratified thermal model.

• Korean Journal of Childcare and Education
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• v.8 no.1
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• pp.45-64
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• 2012

This research is about how infants' multi-cultural recognition and their sphere of activity can be changed when married immigrant women and infants' homeroom teachers were put together in the infants' multi-cultural teaching program. The subjects(children under 5) were selected in "S" city of Gyeonggi-do, South Korea. And they were divided into experimental group 1, experimental group 2, and the control group. And this research did a pretest and post-test for the 60 children. The result of this research can be summarized into three parts. Therefore, it is possible to suggest that the improvement of infants' diversity recognition is affected by a certain kind of teacher and that he/ she can improve the infants' play ability. Experimental group 1 is proceeded by both married immigrant woman and the infants's homeroom teacher. Experimental group 2 was managed by only the homeroom teacher who was going through the same program as the teachers above. The control group was managed by a general nurturing program. This research did do a pretest and post-test for this experiment. -by Chun-Ok. Lee was used for infant's multi-cultural measurement. Mee-sook. Kim's measurement was used for measurement of playfulness between same age children. Meaningful differences was exposed in experimental group 1, experimental group 2, and the control group in sequence. The two experimental groups who had experienced a multi-cultural program seemed to have higher playfulness.

• Proceedings of the KIEE Conference
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• 2004.11c
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• pp.574-576
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• 2004

The directivity of the sound pressure increases the sensitivity of the incoming sound from specific directions. The directivity measurement of the sound pressure is usually done in an anechoic room using a sloping motor. In this paper a replaceable anechoic chamber was designed for the acoustic directivity pattern measurement. Electrical equipments were interfaced with a PC for experiment automatic control. Some comparative results are shown in the result.

• Journal of the Korean Institute of Telematics and Electronics S
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• v.34S no.5
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• pp.66-72
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• 1997

In this paper, we propose a method improving the accuracy of th eregistration coefficients calculated form two range images considering the measurement error. The employed range finder is based on triangulation and the depth measurement error is described with an error covariance matrix, which is based on thesensitivity of the range measurements. Experimental results demonstrate that the registration coefficients obtained with the proposed method are better than the results when the measurment errors are neglected.

• Journal of electromagnetic engineering and science
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• v.4 no.3
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• pp.97-101
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• 2004

Complex permittivities of reference liquids were measured by a liquid holder of slotted coaxial line with a movable probe at mobile communication frequencies. The validity of the liquid measurement system was checked by experimental tests with the reference liquids proposed in IEEE Std. 1528-200X or IEC 106/61/CDV.

• Proceedings of the KSME Conference
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• 2004.11a
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• pp.591-594
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• 2004

The directivity of the sound pressure increases the sensitivity of the incoming sound from specific directions. The directivity measurement of the sound pressure is usually done in an anechoic room using a steping motor. In this paper a replaceable anechoic chamber was designed for the acoustic directivity pattern measurement. Electrical equipments were interfaced with a PC for experiment automatic control. Some comparative results are shown in the result.

• Proceedings of the Korean Society of Agricultural Engineers Conference
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• 2003.10a
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• pp.491-494
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• 2003

An Automatic Water Level Measurement System has been developed in this study. It has the characteristics that it use lower power and solar power and it has the ability of sending data and remote-controlled by wireless MODEM this system was set up in the experimental site and was tested. Also, the management system for the water level data has been developed and will be used by instruments administrating reservoirs.

• Proceedings of the IEEK Conference
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• 1998.06a
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• pp.685-688
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• 1998

Measurement of optical flow is a core problem of matching through the analysis of image sequences. In this paper, horn's and anandan's techniques are analyzed to derive a better technique for matching. Experimental results show that Horn's technique has low accuracy in measuring the velocity of optical flow while anandan's technique has poor performaance for diverging images. Based upon this observation, a new technique for the measurement of optical flow is proposed.

• 제어로봇시스템학회:학술대회논문집
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• 1992.10a
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• pp.937-940
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• 1992

A cost-saving feeding rate contro method for a batch reaction process is proposed by reconfigurating the flow rate control loop where the feeding rate is estimated by differentiating weight measurement. While the existing control methods require either a flow rate measurement device or a flow rate estimator, the proposed method is devised not to require neither of these facilities by directly controlling the tank weight with a time-varying set point. Experimental evaluation in a pilot-scale unit shows that the proposed method can significantly reduce the actuator hunting of the existing method where the flow rate is estimated by differentiating the weight measurement.