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Electronic Components and Technology Conference (ECTC)

作者： Woon-Seong Kwon Se-Young Yang Soon-Bok Lee Kyung-Wook Paik Dept. of Materials Science and Engineering Dept. of mechanical engineering Korea Advanced Institute of Science & Technology Yu-seong gu Daejon Korea Department of Materials Science and Engineering Korea Advanced Institute of Science and Technology Daejeon South Korea

ISBN: (纸本)0780383656

The stress free state and deformation of an ACF flip chip assembly may depend upon the curing characteristics of the adhesive, but may also depend upon the temperature cycling history of the assembly after it was cured. The thermal deformation of an ACF flip chip assembly after curing and cooling-down processes is investigated. In-situ deformation behaviors of ACF flip-chip-on-board assembly under various temperature cycling regimes are investigated using high sensitivity moire interferometry. In particular, the effect of temperature cycling history on the thermal deformation and stress-free state and is discussed in detail. Results indicate that the T/sub g/ of ACF have a significant role in the thermal deformation and stress-free state during thermal cycling testing.

关键词： Thermomechanical processes Flip chip Assembly Thermal stresses Curing Internal stresses History Electronic packaging thermal management Temperature dependence Temperature sensors

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Extruded LZS glass-ceramics

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American Ceramic Society Bulletin 2004年第8期83卷

作者： Montedo, O.R.K. Reitz, G.M. Bertan, F.M. De Novaes Oliveira, A.P. Hotza, D. Siligardi, C. Graduate Program in Materials Science and Engineering Federal University of Santa Catarina Florianópolis Brazil Dept. of Materials and Environment Engineering University of Modena and Reggio Emilia Modena Italy

Experimental results regarding Li2O-ZrO2-SiO 2 (LZS) sintered glass ceramic materials obtained by extrusion of glass powders with an added inorganic material as binder, are presented. Each of the composition were characterized by chemical analysis, laser scattering particle-size analysis, differential thermal analysis (DTA), Xray diffractometry (XRD), and thermal expansion. It was observed that after a sintering process at near by 750°C, crystallization takes place as soon as the process gets over. Once heated, the the glass powder compacts crystallize into zircon and quartz and then to lithium disilicate.

关键词： Glass ceramics

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A nanoscale approach to stamp fabrication in hard materials using high intensity ultrafast lasers

A nanoscale approach to stamp fabrication in hard materials ...

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2003 MRS Fall Meeting

作者： McDonald, Joel P. Picard, Yoosuf N. Yalisove, Steven M. Liu, Hsiao-Hua Blaszczak, Joseph Guo, Lingji J. Dept. of Materials Science and Engineering University of Michigan Ann Arbor MI 48109-2176 United States Center for Ultrafast Optical Science University of Michigan Ann Arbor MI 48109-2099 United States Applied Physics Program University of Michigan Ann Arbor MI 48109-1120 United States Dept. of Electrical Engineering and Computer Science University of Michigan Ann Arbor MI 48109-2122

Nanomorphing with ultrafast lasers may have a significant role in direct write stamp production. Surface conditions play a critical role in the ablative properties of materials. We have conducted femtosecond laser (pulse duration;120 fs, wavelength;780 nm) threshold studies of silicon with the native oxide and silicon with atomically clean surfaces in an ultra-high vacuum environment. We have discovered that a -1.5 nm thick oxide layer can alter the ablation threshold of Si (100) by 25 ± 5%. Additionally, our work has shown that collateral damage can be controlled on the nanoscale. Transmission electron microscopy (TEM) images of femtosecond laser machined holes in Si (100) show that collateral damage extends only 10 nm from the edge. © 2004 materials Research Society.

关键词： Ultrafast phenomena

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Implementation of new services to support ubiquitous computing for campus life

Implementation of new services to support ubiquitous computi...

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Proceedings - Second IEEE Workshop on Software Technologies for Future Embedded and Ubiquitous Systems

作者： Han, Tack-Don Cheong, Cheolho Ahn, Jae-Won Kim, Jong-Young Yoon, Hyung-Min Lee, Chang-Su Shin, Hyon-Gu Lee, Young-Jin Yook, Hyoung-Min Jeon, Myoung-Hoon Choi, Jung Soo Lee, Joo-Hyeon Sohn, Young-Woo Baek, Yoon Su Lee, Sang-Yong Shin, Eun-Dong Kang, WooShik Kim, SeongWoon Dept. of Computer Science Yonsei University Seoul Korea Republic of Dept. of Clothing and Textiles Yonsei University Seoul Korea Republic of Dept. of Psychology Yonsei University Seoul Korea Republic of Grad. Program in Cognitive Science Yonsei University Seoul Korea Republic of Dept. of Mechanical Engineering Yonsei University Seoul Korea Republic of ColorZip Media Inc. Seoul Korea Republic of Samsung Adv. Institute of Technology Seoul Korea Republic of

ISBN: (纸本)0769521231

Many new services have emerged to realize ubiquitous computing environments, owing to the increasing supply of mobile devices and more widespread Internet and wireless network facilities. This paper introduces the U-Campus (Ubiquitous computing for Campus) service. This study has been conducted through interdisciplinary research by four participating departments. The U-Campus Project is part of the UTOPIA project (Ubiquitous computing TOwn Project: Intelligent context Awareness), which covers town- and city-wide environments. Currently, a test bed for U-Campus has been constructed to support various services such as U-Profile, U-Messaging and U-Campus Tour Guide services. Students, professors, school staffs, and campus visitors can easily access the various available campus services by using image-based sensors and mobile devices such as CDMA cellular phones or WiFi smart phones. The major purpose of this research is to provide a context-aware U-Campus environment to users by utilizing sensors and mobile devices currently available in the public sector and the marketplace.

关键词： Computer science

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Transistor characteristics of thermal CVD carbon nanotubes field emission triode

Transistor characteristics of thermal CVD carbon nanotubes f...

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International Conference on Vacuum Nanoelectronics (IVNC)

作者： Y.M. Wong W.P. Kang J.L. Davidson W. Hofmeister S. Wei J.H. Huang Dept. of Electrical Engineering and Computer Science Vanderbilt Univ. Nashville TN USA Interdisciplinary Graduate Program in Material Science Vanderbilt Univ. Nashville TN USA Dept. of Materials Science and Engineering National Tsing Hua Univ. Hsinchu Taiwan ROC

In this paper, the study of thermal CVD grown CNT field emitters in a triode amplifier configuration is reported. The DC characteristics of the CNT triode are investigated, including I/sub a/ vs. V/sub a/ for different V/sub g/. Moreover, DC parameters such as transconductance, amplification factor and anode resistance of the triode amplifier are determined. It was shown that a higher amplification factor can be achieved with optimum gate-anode-cathode spacing such that the cathode is effectively shielded from the anode by the gate but the anode still collects all electrons emitted from the cathode. High emission current at low gate voltage is key to achieving high transconductance. This can be obtained by optimum configuration of high-density CNTs array in a triode structure with a common gate.

关键词： Carbon nanotubes Voltage Anodes materials science and technology Current measurement Palladium Silicon Furnaces Temperature Cathodes

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Surface roughening in homoepitaxial growth: A lattice gas cellular automaton model

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6th International Conference on Cellular Automata for Research and Industry, ACRI 2004

作者： Gerisch, A. Lawniczak, A.T. Budiman, R.A. Fukś, H. Ruda, H.E. 06099 Germany Dept. of Mathematics and Statistics University of Guelph GuelphONN1G 2W1 Canada Dept. of Mechanical and Manufacturing Engineering University of Calgary CalgaryAL T2N 1N4 Canada Dept. of Mathematics Brock University St. Catharines ONL2S 3A1 Canada Dept. of Materials Science and Engineering University of Toronto TorontoONM5S 3E3 Canada

ISBN: (纸本)3540235965

We study the structural evolution of a growing thin film on time scales in the order of seconds and even minutes. This requires solving the problem of bridging large time and length scale gaps in simulating atomistic processes during thin film deposition. We describe a new simulation approach inspired by lattice gas cellular automata to address this problem. The approach is based on a discrete description of atoms so that the unit length scale coincides with the atomic diameter. For homoepitaxial thin film deposition, the local driving force is the propensity of an atom to establish as many chemical bonds as possible to the underlying substrate atoms when it executes surface diffusion. The interaction between atoms is defined using a coarse-grained approach to boost the computation speed without heavily sacrificing the atomistic details. Simulation results of Si layers deposited on a Si(001) substrate are presented. © Springer-Verlag Berlin Heidelberg 2004.

关键词： Atoms

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Implementation of new services to support ubiquitous computing for campus life

Implementation of new services to support ubiquitous computi...

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IEEE Workshop on Software Technologies for Future Embedded Systems

作者： Tack-Don Han Cheolho Cheong Jae-Won Ann Jong-Young Kim Hyung-Min Yoon Chang-Su Lee Hyon-Gu Shin Young-Jin Lee Hyoung-Min Yook Myoung-Hoon Jeon Jung Soo Choi Joo-Hyeon Lee Young-Woo Sohn Yoon Su Baek Sang-Yong Lee Eun-Dong Shin WooShik Kang SeongWoon Kim Department of Computer Science Yonsei University Seoul South Korea Dept. of Computer Science Yonsei University Seodaemun-gu Seoul KR Dept. of Comput. Sci. Yonsei Univ. South Korea Department of Clothing & Textiles Yonsei University Seoul South Korea Dept. of Clothing & Textiles Graduate Program in Cognitive Science Yonsei University Seoul South Korea Graduate Program in Cognitive Science Department of Mechanical Engineering Yonsei University Seoul South Korea Dept. of Mechanical Engineering Department of Psychology Yonsei University Seoul South Korea Dept. of Psychology ColorZip Media Inc. Seoul South Korea Yonsei University ColorZip Media Inc. Samsung Advanced Institute of Technology Seoul South Korea

ISBN: (纸本)0769521231

Many new services have emerged to realize ubiquitous computing environments, owing to the increasing supply of mobile devices and more widespread Internet and wireless network facilities. We introduce the U-Campus (ubiquitous computing for campus) service. This study has been conducted through interdisciplinary research by four participating departments. The U-campus project is part of the UTOPIA project (Ubiquitous computing TOwn Project: Intelligent context Awareness), which covers town- and city-wide environments. Currently, a test bed for U-campus has been constructed to support various services suck as U-profile, U-messaging and U-campus tour guide services. Students, professors, school staffs, and campus visitors can easily access the various available campus services by using image-based sensors and mobile devices such as CDMA cellular phones or WiFi smart phones. The major purpose of this research is to provide a context-aware U-campus environment to users by utilizing sensors and mobile devices currently available in the public sector and the marketplace.

关键词： Ubiquitous computing Intelligent sensors Mobile computing IP networks Web and internet services Wireless networks Context awareness Testing Educational institutions Image sensors

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Doe's effort to reduce truck aerodynamic drag - joint experiments and computations lead to smart design

Doe's effort to reduce truck aerodynamic drag - joint experi...

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34th AIAA Fluid Dynamics Conference and Exhibit 2004

作者： McCallen, Rose C. Salari, Kambiz Ortega, Jason M. DeChant, Larry J. Hassan, Basil Roy, Christopher J. Pointer, W. David Browand, Fred Hammache, Mustapha Hsu, Tsun-Ya Leonard, Anthony Rubel, Mike Chatalain, Philippe Englar, Robert Ross, James Satran, D. Heineck, James T. Walker, Stephen Yaste, D. Storms, B. Lawrence Livermore National Laboratory Livermore CA 94551 United States Sandia National Laboratories Albuquerque NM 87185-0825 United States Auburn University Auburn AL 36849 United States Argonne National Laboratory Argonne IL 60439 United States University of Southern California LosAngeles CA 90089-1191 United States Georgia Tech Research Institute Atlanta GA 30332 United States NASA Ames Research Center Moffet Field CA 94035 United States Center for Applied Scientific Computing P.O. Box 808 L-98 United States New Technologies Engineering Division P.O. Box 808 L-644 United States Aerosciences and Compressible Fluid Mechanics Dept. PO Box 5800 MS 0825 United States Aerospace Engineering Dept. 211 Aerospace Engineering Bldg United States Nuclear Engineering Division NE-208 United States Aerospace and Mechanical Engineering MS 1191 United States Engineering and Applied Science 1200 East California Blvd. MC 301-46 United States Graduate Aeronautical Laboratories 1200 East California Blvd. MC 205-45 United States Aerospace Transportation and Advanced Systems Code 0844 United States Systems Analysis Branch MS 260-1 United States Aeronautical Projects and Program Office MS 260-1 United States

ISBN: (纸本)9781624100314

At 70 miles per hour, overcoming aerodynamic drag represents about 65% of the total energy expenditure for a typical heavy truck vehicle. The goal of this US Department of Energy supported consortium is to establish a clear understanding of the drag producing flow phenomena. This is being accomplished through joint experiments and computations, leading to the 'smart' design of drag reducing devices. This paper will describe our objective and approach, provide an overview of our efforts and accomplishments, and discuss our future direction. © 2004 by the American Institute of Aeronautics and Astronautics, Inc.

关键词： Aerodynamic drag

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A Study on Viscoelastic Fluid Flow in a Square-Section 90-Degrees Bend

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Journal of Thermal science 2003年第4期12卷 337-343页

作者： Mizue Munekata Kazuyoshi Matsuzaki Hideki Ohba Dept. of Mechanical Engineering and Materials Science Kumamoto University Kurokami 2-39-1 Kumamoto JapanDept. of Mechanical Engineering and Materials Science Kumamoto University Kurokami 2-39-1 Kumamoto JapanDept. of Mechanical Engineering and Materials Science Kumamoto University Kurokami 2-39-1 Kumamoto Japan

It is well known that the drag-reducing effect is obtained in a surfactant solution flow in a straight pipe. We investigate about a viscoelastic fluid flow such as a surfactant solution flow in a square-section 90° bend. In the experimental study, drag-reducing effect and velocity field in a surfactant solution flow are investigated by measurements of wall pressure loss and LDV measurements. For the numerical method, LES with FENE-P model is used in the viscoelastic fluid flow in the bend. The flow characteristics of viscoelastic fluid are discussed compared with that of a Newtonian fluid.

关键词： non-Newtonian flow viscoelastic fluid drag reduction bend flow LES LDV.

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Embedded fiber Bragg grating sensors in polymer structures fabricated by layered manufacturing

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Journal of Manufacturing Processes 2003年第1期5卷 78-86页

作者： Li, Xiaochun Prinz, Fritz Dept. of Mechanical Engineering University of Wisconsin-Madison Madison WI United States Dept. of Mechanical Engineering Dept. of Materials Science Stanford University Stanford CA United States

Layered manufacturing allows full access to any point of interest during the production of a 3-D part, making feasible the embedding of sensors and components inside the functional part. Shape deposition manufacturing was used to integrate fiber Bragg grating (FBG) sensors during the production of polymer components. Sensors can be placed close to points of interest prior to enclosure. For strain measurements, the sensors embedded in polyurethane yielded high sensitivity, accuracy, and linearity. The sensitivity of the embedded FBGs was in good agreement with that of bare FBGs. The embedded sensors were used to measure the strain field in layered materials. Pressure sensors based on embedded strain gauges and FBGs were also developed and tested, showing good accuracy and linearity.

关键词： Embedded Sensors Fiber Bragg Grating Layered Manufacturing Polymer Components

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