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25 results on '"Tseng, Stephen"'

1. Thermal interface materials selection and application guidelines: in perspective of Xilinx Virtex-5QV thermal management

Author

Tseng, Stephen, Dillon, R. Peter, and Suh, Jong-ook

Abstract

The heat from high-power microdevices for space, such as Xilinx Virtex 4 and 5 (V4 and V5), has to be removed mainly through conduction in the space vacuum environment. The class-Y type packages are designed to remove the heat from the top of the package, and the most effective method to remove heat from the class-Y type packages is to attach a heat transfer device on the lid of the package and to transfer the heat to frame or chassis. When a heat transfer device is attached to the package lid, the surfaces roughness of the package lid and the heat transfer device reduces the effective contact area between the two. The reduced contact area results in increased thermal contact resistance, and a thermal interface material is required to reduce the thermal contact resistance by filling in the gap between the surfaces of the package lid and the heat transfer device.

Published
2015

2. Thermal Interface Materials Selection and Application Guidelines: In Perspective of Xilinx Virtex-5QV Thermal Management

Author

Suh, Jong-ook, Dillon, R. Peter, and Tseng, Stephen

Subjects
Fluid Mechanics And Thermodynamics
Abstract

The heat from high-power microdevices for space, such as Xilinx Virtex 4 and 5 (V4 and V5), has to be removed mainly through conduction in the space vacuum environment. The class-Y type packages are designed to remove the heat from the top of the package, and the most effective method to remove heat from the class-Y type packages is to attach a heat transfer device on the lid of the package and to transfer the heat to frame or chassis. When a heat transfer device is attached to the package lid, the surfaces roughness of the package lid and the heat transfer device reduces the effective contact area between the two. The reduced contact area results in increased thermal contact resistance, and a thermal interface material is required to reduce the thermal contact resistance by filling in the gap between the surfaces of the package lid and the heat transfer device. The current report describes JPL's FY14 NEPP task study on property requirements of TIM and impact of TIM properties on the packaging reliability. The current task also developed appratuses to investigate the performances of TIMs in the actual mission environment.

Published
2015

5. SCREEN REFRESH.

Author

Tseng, Stephen and Lu, David

Subjects
CRITICAL illness insurance
Published
2022

20. Multi-sensor selection optimization and driver warning decision for dynamical virtual driving simulator

Author

Hsu, Chih-Ming, Lian, Feng-Li, Hsieh, Yi-Chen, and Tseng, Stephen P.

Abstract

AbstractThis article presents a framework for the design and development of a multi-sensor selection optimization mechanism for a driver assistance simulation system. The multi-sensor selection mechanism is formulated as an optimization problem and solved by integer linear programming. Both static and dynamic driving scenarios are considered in the formulation; where a static scenario denotes an off-line multi-sensor selection problem and a dynamic scenario denotes an online driving condition transformation problem. The objective function for determining an optimal set of sensors is in terms of guaranteed coverage, energy, bandwidth, and reliability of sensors. For different driving conditions, and driver commands, a selection algorithm is developed for identifying the environment around the vehicle and warning the driver. The selection algorithm and multiple-vehicle driving examples are successfully implemented in a virtual driving simulator.

Published
2016
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23. An embedded image processing and feedback compensation for the vibration-resistance system using white light interferometer

Author

Tseng, Stephen P., Chen, Liang-Chia, Ho, Calvin, and Sheng, Chih-Yang

Abstract

The active interferometer has been approved as an effective architecture to increase the precision of surface profile measurement by detecting the environmental vibration and then stabilized by a piezoelectric transducer. The performance of such system can improve the accuracy within nano-meters. Most of the active interferometers have being implemented on the PC based platform because it is easy to be setup and modulized, However, the latency of image grabbing processing, mathematic algorithm and I/O trigger delay is around 10~15ms. Moreover, the latency is varying if different PCs are used. In this study, an embedded real-time controller based on the ADI Blackfin BF561 DSP microprocessor was developed to improve the performance of a vibration-resistance system using white-light interferometer. The purpose of this embedded control system is to detect the vibration and compensate it for White Light Interferometer when processing stepping photograph grabbing for surface profile measurement. A customized embedded control system with a 600 MHz high performance microprocessor, Camera Link interface, DAC circuit and UART command port has been developed. A complete command set has also been defined to communicate with PC based interferometer user interface for close-loop control. The latency has been reduced from tens of millimeters to 250 s as tested for all the procedures from CCD trigger, image processing, to PZT control signal output. It has been proved to be useful of fixing the latency between phase detecting and compensation output. With this advantage, the response of the interferometer can accelerated so that the vibration-resistance is improved and the overall accuracy can be in the range of a few nano-meters.

Published
2011
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25. Hamburger high in total, saturated and trans-fatty acids decreases HDL cholesterol and LDL particle diameter, and increases TAG, in mildly hypercholesterolaemic men.

Author

Adams TH, Walzem RL, Smith DR, Tseng S, and Smith SB

Subjects
Adult, Animals, Body Mass Index, Body Weight, Cattle, Cholesterol, HDL chemistry, Cholesterol, HDL drug effects, Cholesterol, LDL chemistry, Cholesterol, LDL drug effects, Energy Intake, Humans, Male, Middle Aged, Triglycerides blood, Cholesterol, HDL blood, Cholesterol, LDL blood, Dietary Fats pharmacology, Fatty Acids pharmacology, Food Handling, Hypercholesterolemia blood, Meat, Trans Fatty Acids pharmacology
Abstract

The consumption of high-fat hamburger enriched with SFA and trans-fatty acids may increase risk factors for coronary vascular disease, whereas hamburger enriched with MUFA may have the opposite effect. Ten mildly hypercholesterolaemic men consumed five, 114 g hamburger patties per week for two consecutive phases. Participants consumed high-SFA hamburger (MUFA:SFA = 0.95; produced from pasture-fed cattle) for 5 weeks, consumed their habitual diets for 3 weeks and then consumed high-MUFA hamburger (MUFA:SFA = 1.31; produced from grain-fed cattle) for 5 weeks. These MUFA:SFA ratios were typical of ranges observed for retail ground beef. Relative to habitual levels and levels during the high-MUFA phase, the high-SFA hamburger: increased plasma palmitic acid, palmitoleic acid and TAG (P < 0.01); decreased HDL cholesterol (HDL-C) and LDL particle diameter percentile distributions (P < 0.05); and had no effect on LDL cholesterol or plasma glucose (P>0.10). Plasma palmitoleic acid was positively correlated with TAG (r 0.90), VLDL cholesterol (r 0.73) and the LDL:HDL ratio (r 0.45), and was negatively correlated with plasma HDL-C (r - 0.58), whereas plasma palmitic, stearic and oleic acids were negatively correlated with LDL particle diameter (all P

Published
2010
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