Browsing by Author "Wang, WL"

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Effect of boundary conditions on the hydraulic behavior of geotextile filtration system
(2001-12-01)
Shan, HY
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Wang, WL
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Chou, TC
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土木工程學系
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Department of Civil Engineering
There are several test methods available for studying the behavior of geotextile/soil filtration systems. However, there has not been a consensus on which one of these methods should be the most appropriate. In this research, gradient ratio (GR) tests and hydraulic conductivity (HCR) tests were performed to evaluate the effects of boundary conditions on the behavior of geotextile/soil filtration systems. The test results show that the hydraulic conductivity of the filtration systems decreased as the effective stress and hydraulic gradient increased. Furthermore, the hydraulic conductivity obtained from GR tests with a hydraulic gradient of 5 could be taken as the lower bounds for HCR test results. Therefore, it is suggested that the GR test can be used to obtain reasonable and conservative design parameters of the filtration systems. (C) 2001 Elsevier Science Ltd. All rights reserved.
Random Line selected Charge Accumulation (RLCA) CCD readout structure for high frame rate infrared image application
(2000)
Horng, GJ
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Chang, CY
;
Yen, YC
;
Wang, WL
;
電子工程學系及電子研究所
A 512x512 monolithic Platinum Silicide Schottky Barrier detector array with random line selectable operation was proposed. The device modified from an interline CCD configuration by adapt a Random Line selected Charge Accumulation charge-coupled device on the vertical register and four tap readout on the horizontal CCD register to achieve a high frame rate and high fill factor operation. A 9-bit digital decoder is used to select which line of the sensor array that transfer their signals to the vertical CCD register. Accompanied with the vertical reset drain circuitry, either one line or up to 512 lines of the video signals can be selected and transferred to the vertical CCD register. All of the video signals on the unselected lines are then transferred to the vertical CCD channel simultaneously and finally dumped to the vertical reset drain. Since this unique readout structure, a frame rate of up to 240 frames/second can be achieved for 128x128 of the SBD array under 5 MHz of clock frequency. A high-speed sub-frame readout format can be easily fulfilled under this architecture. This architecture not only maintains the advantages of line-addressed charge-accumulation structure but also provides the capability to readout any portion of the array.