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International Symposium on High Density Packaging and Microsystem Integration (HDP)

作者： Xiaolong Zhong Yi Fan Johan Liu Yan Zhang Teng Wang Zhaonian Cheng Key Laboratory of Advanced Display and System Applications (Shanghai University) Ministry of Education & SMIT Center Shanghai University Shanghai China SMIT Center & Department of Microsystem and Nanotechnology Chalmers University of Technology Goteborg Sweden Department of Applied Mechanics Chalmers University of Technology Goteborg Sweden

The 2D CFD simulations have been carried out for a series of CNT micro-fin cooling architectures based on two dimensional fin array models in this paper. The influence of micro-fin structures, fluid speeds, heating powers and effective thermal conductivity on cooling effects have been obtained in the case studies, and the 2D fin array simulation results have been compared with our previous 1D fin array simulation results. The CFD simulations indicate that the fluid speed is the key factor of heat transfer, and the heat generated on chip is removed by liquid mass flowing in the channels of micro-fin architectures. The pressure drop between inlet and outlet of the cooling device is an important cause limiting the fluid speed, and the excessive pressure drop will destroy the carbon nanotube fin arrays. The simulation results in present work also indicate that the cooling capability of 2D carbon nanotube fin array is more efficient than that of 1D carbon nanotube fin array, that is, 2D fin array can reduce the thermal resistance of the cooler although 2D fin array causes more pressure drop in the architecture than 1D fin array.

关键词： Computational fluid dynamics Cooling Microchannel Carbon nanotubes Thermal conductivity Heat transfer Solid modeling Two dimensional displays Chemical technology Educational technology

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A Study of Effects of Coolants on Heat Transfer Capability of On-chip Cooling with CNT Micro-fin Architectures by Using CFD Simulation

A Study of Effects of Coolants on Heat Transfer Capability o...

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International Symposium on High Density Packaging and Microsystem Integration (HDP)

作者： Yi Fan Xiaolong Zhong Johan Liu Teng Wang Yan Zhang Zhaonian Cheng Key Laboratory of Advanced Display and System Applications (Shanghai University) Ministry of Education & SMIT Center Shanghai University Shanghai China SMIT Center & Department of Microsystem and Nanotechnology Chalmers University of Technology Goteborg Sweden Department of Applied Mechanics Chalmers University of Technology Goteborg Sweden

The two-dimensional computational fluid dynamics (CFD) simulations have been done for a series of material parameters of coolants in this paper. The influences of thermal conductivity, density, specific heat and viscosity on cooling have been obtained in the case studies. The pressure drop between the inlet and outlet of the cooling device is dependent on coolant's density and viscosity. Consequently, it will be necessary to find out a good balance between heat transfer capability and pressure drop. The simulation results also indicate that the heat sink capability will be better if there are more fin rows in the microchannel.

关键词： Coolants Heat transfer Cooling Computational fluid dynamics Computational modeling Thermal conductivity Viscosity Computer architecture Conducting materials Heat sinks

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Realization of Ultra Wideband Bandpass Filter based on LCP Substrate for Wireless application

Realization of Ultra Wideband Bandpass Filter based on LCP S...

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International Symposium on High Density Packaging and Microsystem Integration (HDP)

作者： Xia Zhang Camilla Karnfelt Johan Liu Shiwei Ma Xu Wang Linqin Meng Herbert Zirath SMIT Center & Department of Microtechnology Nanoscience Chalmers University of Technology Gothenburg Sweden Key Laboratory of Advanced Display and System Applications (Shanghai University) Ministry of Education & SMIT Center Shanghai University Shanghai China Department of Microtechnology and Nanoscience Chalmers University of Technology MC2 Microwave Electronics Laboratory Gothenburg Sweden School of Communication and Information Engineering Shanghai University China

Liquid crystal polymer (LCP) materials are considered to be promising substrates for RF applications because of the unique combination of features and performance. Although LCP films offer many excellent properties, the poor adhesion between copper and LCP has prevented the use of these materials in flexible microwave circuits. In order to obtain better adhesion between LCP and copper, oxygen plasma pretreatment of the LCP substrate and a thin Ti adhesion layer are introduced before a Cu layer was sputtered on to the substrate. Finally, a novel and compact microstrip ultra wide band (UWB) band pass filter (BPF) is fabricated on LCP substrates using standard processing technology i.e. physical vapor deposition (PVD), lithography and wet etching, which provides LCP substrate the feasibility of the application in RF wireless systems.

关键词： Ultra wideband technology Band pass filters Adhesives Copper Crystalline materials Radio frequency Liquid crystal polymers Microwave circuits Flexible printed circuits Plasma applications

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Encapsulation of OLED device by Using Anisotropic Conductive Adhesive

Encapsulation of OLED device by Using Anisotropic Conductive...

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International Symposium on High Density Packaging and Microsystem Integration (HDP)

作者： Yan Zhang Mans Andreasson Hua Zhou Johan Liu Thorvald Andersson Jing-yu Fan Department of Applied Mechanics Chalmers University of Technology Gothenburg Sweden Key Laboratory of Advanced Display and System Applications (Shanghai University) Ministry of Education & SMIT Center Shanghai University China Applied seminconductor Physics Department of Microtechnology and Nanoscience Chalmers University of Technology Gothenburg Sweden SMIT Center & Department of Microtechnology and Nanoscience Chalmers University of Technology Gothenburg Sweden Shanghai Institute of Applied Mathematics and Mechanics Shanghai University Shanghai China

Organic light emitting diodes (OLEDs) is one of the most potential display technologies in the flat panel display (FPD) field, and its applications include simple monochrome large-area lighting to full color, video-capable graphics displays and so on. As organic materials are susceptible to humidity and oxygen, encapsulation is a key issue for OLED device reliability. In the present paper, two kinds of OLED samples have been studied; one encapsulated by adhesive matrix with fillers, and one without encapsulation. Variation of the electrical parameters of the OLED samples with respect to exposure time has been measured. The primary experiment investigation was carried out for the OLED sample sealed with an anisotropic conductive adhesive. Encapsulation material analysis, such as choices of different fillers/absorbent in the adhesive matrix, optimization of polymer matrix etc., will be conducted in future work.

关键词： Encapsulation Organic light emitting diodes Anisotropic magnetoresistance Conductive adhesives Flat panel displays LED lamps Graphics Organic materials Humidity Materials reliability

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Exciplex formation and properties at organic solid interface in organic light emitting devices

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Journal of Shanghai University(English Edition) 2006年第2期10卷 156-160页

作者：朱文清蒋雪茵张志林 Key Laboratory of Advanced Display and System Application of Education Ministry Shanghai University Shanghai 200072 P.R. China

The bilayer organic light emitting devices （OLEDs） using two common aromatic diamines as hole transporting materials （HTMs） and BBOT （2,5-bis（5-tert-butyl-2-benzoxazolyl）thiophene） as electron transporting material have been prepared, in which the electroluminescent spectra are different from the fluorescent spectra of each of the constituent materials. The electroluminescence is mainly attributed to exciplex confirmed by photoluminescence and electroluminescence measurements, and the type of exicplex is deternfined in terms of the energy level diagram of the bilayer devices, By comparing the molecular structures and energy levels of TPD and NPB, it is demonstrated that the structure of a molecule as well as its energy level has an effect on the exciplex formation.

关键词： organic electroluminescence photoluminescence exciplex color tuning molecular structure

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Mosaic Generation in H.264 Compressed Domain

Mosaic Generation in H.264 Compressed Domain

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International Conference on Intelligent Sensing and Information Processing (ICISIP)

作者： Zhi Liu Zhaoyang Zhang Liquan Shen Key Laboratory of Advanced Display and System Application Ministry of Education Shanghai China School of Communication and Information Engineering Shanghai University Shanghai China

This paper presents an efficient approach to mosaic generation in H.264 compressed domain. The proposed mosaic generation approach fully exploits several new coding characteristics of the H.264 standard, i.e., variable block size and the quarter-pel accuracy of motion vector (MV). A uniformly sampled and normalized MV field is first derived from the H.264 compressed video. Then an affine model is used to estimate the global motion from the normalized MV field, and the model parameters are iteratively refined based on outlier rejection scheme. Finally, the most recent and reliable background pixels from multiple frames are warped to the reference frame and then used to integrate the final mosaic. Experimental results demonstrate that the proposed approach is efficient for mosaic generation in H.264 compressed domain.

关键词： Video compression Motion estimation Video sequences Object segmentation Iterative algorithms Image motion analysis Parameter estimation Character generation Indexing Video coding

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Object based disparity estimation and view synthesis for immersive video conferencing

Object based disparity estimation and view synthesis for imm...

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25th PCS: Picture Coding Symposium 2006, PCS2006

作者： An, Ping Liu, Jia Zhang, Zhaoyang School of Communication and Information Engineering Shanghai University 149 Yanchang Road Shanghai 200072 China Key Laboratory of Advanced Displays and System Application Ministry of Education 149 Yanchang Road Shanghai 200072 China

ISBN: (纸本)300018726X

In immersive three-dimensional video conferencing system, disparity estimation and view synthesis are the key technologies that not only realize disparity map coding and transmission, but also achieve the effect of "Continuous look-around". Applying of object-based methods can insure obtaining accurate and fast disparity estimation that is convenient for intermediate view synthesis. Another advantage is that the segmented objects can be seamlessly embedded into virtual or natural environment in three-dimensional video conferencing. In this paper, an intermediate view synthesis algorithm based on object with large camera baseline is put forward. Firstly, foreground area is distinguished from background, and the disparity of only object area is estimated by a predict recursion method to increase the matching speed and accuracy. Then the intermediate view image is created by counter-map technology. Experimental results show that our synthesis method can obtain disparity map and intermediate views with high quality.

关键词： Video conferencing

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An Adaptive Fractional Pixel Search Algorithm

An Adaptive Fractional Pixel Search Algorithm

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International Conference on Intelligent Sensing and Information Processing (ICISIP)

作者： Liquan Shen Zhaoyang Zhang Zhi Liu Wenjun Zhang Key Laboratory of Advanced Display and System Application Ministry of Education Shanghai University Shanghai China Institute of Image Communication& Information Processing Shanghai Jiaotong University China

In this paper, we propose an adaptive fractional pixel search algorithm for reduction computation its load. Based on that SAD (sum of absolute difference) error surface is unimodal within the range of plusmn1 pixel, a novel fractional pixel search bypass strategy is first proposed; Then, a strategy of fractional pixel search early termination based on all-zero block detection is proposed. Finally, an adaptive fractional pixel search algorithm adopting above strategies and improved CBFPS (center biased fractional pixel search) algorithm is proposed. Compared with the fractional pixel full search algorithm and JVT-F017 that adopts CBFPS, simulation results show that the proposed algorithm can reduce 76.60% and 68.22% fractional pixel search points respectively while it still maintains similar coding efficiency.

关键词： Motion estimation Vectors Video coding Testing Paramagnetic resonance Pixel Image communication Information processing Computer displays Redundancy

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Robust moving object segmentation in the compressed domain for H.264/AVC video stream

Robust moving object segmentation in the compressed domain f...

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25th PCS: Picture Coding Symposium 2006, PCS2006

作者： Yang, Gaobo Yu, Shengfa Zhang, Zhaoyang Network and Information Security Lab School of Computer and Communication Hunan University Changsha Hunan 410082 China School of Electronic Science and Engineering National University of Defense Technology Changsha Hunan 410073 China Key Laboratory of Advanced Displays and System Application Shanghai University Ministry of Education Shanghai 200072 China

ISBN: (纸本)300018726X

Moving object segmentation in the compressed domain plays an important role in many real-time applications, e.g. video indexing, video surveillance, etc. H.264/AVC is the up-to-date video coding standard, which employs several new coding tools and provides a different video format. In this paper, a robust spatio-temporal segmentation approach to extract moving objects in the compressed domain for H.264 video stream is proposed. Coarse moving objects are firstly extracted from the motion vector field through the MRF classification process. Spatial segmentation is based on the HT coefficient, which is used to refine the object boundary of temporal segmentation results. Fusion of spatio-temporal segmentation is based on region projection based labeling technique. Further edge refinement is performed to smooth the object boundaries. The performance of the proposed approach is illustrated by simulation carried on several test sequences. Experimental results show that the proposed approach can provide the visually similar results as by using spatial domain process with much less computational complexity.

关键词： Image segmentation

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New Nano-Thermal Interface Materials (Nano-TIMs) with SiC Nano-Particles Used for Heat Removal in Electronics Packaging applications

New Nano-Thermal Interface Materials (Nano-TIMs) with SiC Na...

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International Symposium on Electronic Materials and Packaging

作者： Wen Xuan Wang Xiuzhen Lu Johan Liu Michael Olugbenga Olorunyomi Tomas Aronsson Dongkai Shangguan Key Laboratory of Advanced Display and System Applications (Chinese Ministry of Education) and SMIT Center Shanghai University Shanghai China SMIT Center & Department of Microtechnology and Nanoscience University of Technology Gothenburg Sweden

Heat dissipation of semiconductor packages has become one of the limiting factors in miniaturization. A new Nano Thermal Interface Material (Nano-TIM) with potential high thermal conductivity and excellent mechanical properties manufactured by electrospinning process has been published earlier. In the present work, SiC nano-particles were added into the electrospinning solution to improve the thermal conductivity of the film. The produced Nano-TIM has a nano scale structure with embedded nano-SiC distributed randomly. Scanning Electrical Microscope (SEM) was used to determine the morphology of the film. Thermal properties were measured. The results show that the Nano-TIM has good thermal properties and it can be further improved by changing the mass concentration of the SiC nano particles.

关键词： Nanostructured materials Silicon carbide Electronics packaging Thermal conductivity Electronic packaging thermal management Conducting materials Semiconductor materials Scanning electron microscopy Semiconductor device packaging Mechanical factors

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