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Brief Review of Silver Sinter-bonding Processing for Packaging High-temperature Power Devices

Chinese Journal of Electrical Engineering 2020年第3期6卷 25-34页

作者： Haidong Yan Peijie Liang Yunhui Mei Zhihong Feng School of Mechanical and Electrical Engineering Guilin University of Electronic TechnologyGuilin 541004China Guangxi Key Lab of Manufacturing System and Advanced Manufacturing Technology Guilin 541004China School of Materials Science and Engineering Tianjin UniversityTianjin 300072China Key Laboratory of Advanced Ceramics and Machining Technology of Ministry of Education Guilin 541004China National Key Lab of Application Specific Integrated Circuit Hebei Semiconductor Research InstituteShijiazhuang 050051China

Silver sintering is receiving increasing attention due to its novel die-attach technique for high-temperature power *** thermal conductivity,high melting point/remelting temperature and low-temperature sintering behaviors of the silver sintered attachment meet the requirements of high-temperature applications for power devices,specifically SiC *** merits and demerits of the existing pressure-assisted sintering and pressure-less sintering techniques using nano-scale,micro-scale and micro-nano-scale hybrid silver sintered materials are separately *** emerging rapid sintering approaches,such as the electric-assisted approach,are briefly introduced and the technical outlook is *** addition,the study highlights the importance of creating a brief resource guide on using the correct sintering methods.

关键词： Pressure-less sintering pressure-assisted nanosilver paste high-temperature power module insulated gate bipolar translators(IGBT) silicon carbide(SiC)

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Subjective evaluation of light field images for quality assessment database 14th

Subjective evaluation of light field images for quality asse...

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14th International Forum of Digital TV and Wireless Multimedia Communication, IFTC 2017

作者： Shan, Liang An, Ping Liu, Deyang Ma, Ran Key Laboratory of Advanced Displays and System Application Shanghai Institute for Advanced Communication and Data Science Ministry of Education Shanghai University Shanghai200444 China School of Computer and Information Anqing Normal University Anqing246133 China

ISBN: (纸本)9789811081071

Light filed imaging is becoming popular for its diversity of post-processing and a wide range of applications. Various kinds of research about light field such as light field compression methods are coming out one after the other in recent years. For better evaluation of the quality of light field images and the performance of compression algorithm, the study on quality assessment of light field is in desperate need. In this paper, in order to establish a light field quality assessment database for the subsequent research, we propose a methodology of subjective evaluation for light field image and use a 2D objective evaluation method to verify the methodology. Results show that this methodology can be successfully used to assess the quality of light field content. © 2018, Springer Nature Singapore Pte Ltd.

关键词： Quality control

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High-efficiency, broad-band and wide-angle optical absorption in ultra-thin organic photovoltaic devices

High-efficiency, broad-band and wide-angle optical absorptio...

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作者： Wang, Wenyan Hao, Yuying Cui, Yanxia Tian, Ximin Zhang, Ye Wang, Hua Shi, Fang Wei, Bin Huang, Wei Key Lab. of Advanced Transducers and Intelligent Control System Ministry of Education Taiyuan University of Technology Taiyuan 030024 China Key Laboratory of Interface Science and Engineering in Advanced Materials Taiyuan University of Technology Taiyuan 030024 China Key Laboratory of Advanced Display and System Applications Ministry of Education Shanghai University Yanchang Road 149 Shanghai 200072 China Nanjing 210046 China

Metal nanogratings as one of the promising architectures for effective light trapping in organic photovoltaics (OPVs) have been actively studied over the past decade. Here we designed a novel metal nanowall grating with ultra-small period and ultra-high aspect-ratio as the back electrode of the OPV device. Such grating results in the strong hot spot effect in-between the neighboring nanowalls and the localized surface plasmon effect at the corners of nanowalls. These combined effects make the integrated absorption efficiency of light over the wavelength range from 400 to 650 nm in the active layer for the proposed structure, with respect to the equivalent planar structure, increases by 102% at TM polarization and by 36.5% at the TM/TE hybrid polarization, respectively. Moreover, it is noted that the hot spot effect in the proposed structure is more effective for ultra-thin active layers, which is very favorable for the exciton dissociation and charge collection. Therefore such a nanowall grating is expected to improve the overall performance of OPV devices. © 2014 Optical Society of America.

关键词： Light absorption

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Online-programming IP design and implementation based on SoC

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Open Automation and Control systems Journal 2013年第1期5卷 59-66页

作者： Yang, Wenrong Jiang, Chao Hu, Yueli Key Laboratory of Advanced Display and System Application Shanghai University Shanghai 200072 China School of Mechatronic Engineering and Automation Shanghai University Shanghai 200072 China

It is mainly proposed that the design and implementation for an online-programming IP core based on MV10, an SoC, which is an 8-bit MCU having passed the silicon verification with Global Foundry 0.35um mix-signal library in this thesis. The online-programming IP core can write BIN file into the on-chip SRAM, which is mainly controlled by erasing state machine and programming state machine, for program debugging with high accuracy-communication and error self-detection. The online-programming IP core proposed in this thesis can also be used in other SoCs. © Yang et al.

关键词： system-on-chip

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High-quality OLED Micro-display aided by PGL-SCS operator

High-quality OLED Micro-display aided by PGL-SCS operator

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International Conference on display Technology, ICDT 2018

作者： Guo, Aiying Ran, Feng Zhang, Jianhua Xu, Meihua Shen, Huaming Key Laboratory of Advanced Display and System Applications Ministry of Education Shanghai China Microelectronic Research and Development Center Shanghai China School of Mechatronics Engineering and Automation Shanghai China

ISBN: (纸本)9781510867659

In the high-quality OLED micro-display, it is difficult to balance the faster frame refresh rate and higher resolution frame. In order to solve this problem, this paper propose a high-efficient PGL-SCS (Particle Gray Level-Scan Control Strategy) operator as the new scan strategy, which is based on the digital fractal scan strategy. This paper firstly introduces the theory model of PGL-SCS operator, which based on the relationship between sub-space code sequences and bit code sequences for different gray levels. Second, the theory performance of PGL-SCS is analysed. At last, the PGL-SCS operator is tested using the IP core and self-build HD OLED micro-display system. The experiments shows that the PGL-SCS operator can obtain 100% scan utilization and a significant decrease in the system clock frequency, compared with the traditional scan methods. With the proposed PGL-SCS there is no need of using high-speed IC circuits to realize the high-resolution and high-quality OLED micro-display system. © 2018 SID.

关键词： display devices

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Unsupervised human height estimation from a single image

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Journal of Biomedical Science and Engineering 2009年第6期2卷 425-430页

作者： Ye-Peng Guan School of Communication and Information Engineering Shanghai University Key Laboratory of Advanced Displays and System Application Ministry of Education

The single image containing only a human face not previously addressed in the literature is employed to estimate body height. The human face especially the facial vertical distribution possesses some important information which strongly correlates with the stature. The vertical proportions keep up relative constancy during the human growth. Only a few facial features such as the eyes, the lip and the chin are necessary to extract. The metric stature is estimated according to the statistical measurement sets and the facial vertical golden proportion. The estimated stature is tested with some individuals with only a single facial image. The performance of the proposed method is compared with some similar methods, which shows the proposal performs better. The experimental results highlight that the developed method estimates stature with high accuracy.

关键词： Human Height Estimation Golden Proportion Facial Proportion Feature Extraction Projection Model

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Adaptive Motion Segmentation for Changing Background

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Journal of Software Engineering and applications 2009年第2期2卷 96-102页

作者： Yepeng Guan School of Communication and Information Engineering Shanghai University Key Laboratory of Advanced Displays and System Application Ministry of Education

Segmentation of moving objects efficiently from video sequence is very important for many applications. Background subtraction is a common method typically used to segment moving objects in image sequences taken from a statistic camera. Some existing algorithms cannot adapt to changing circumstances and require manual calibration in terms of specification of parameters or some hypotheses for changing background. An adaptive motion segmentation method is developed according to motion variation and chromatic characteristics, which prevents undesired corruption of the background model and does not consider the adaptation coefficient. RGB color space is selected instead of introducing complex color models to segment moving objects and suppress shadows. A color ratio for 4-connected neighbors of a pixel and multi-scale wavelet transformation are combined to suppress shadows. The mentioned approach is scene-independent and high correct segmentation. It has been shown that the approach is robust and efficient to detect moving objects by experiments.

关键词： Motion Segmentation Background Update Background Subtraction Motion Variation Shadow Suppression

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Single-channel blind separation of JPEG permuted image using double compression

Single-channel blind separation of JPEG permuted image using...

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2010 International Conference on Audio, Language and Image Processing, ICALIP 2010

作者： Wang, Wei Fang, Yong School of Communication and Information Engineering Key Laboratory of Specialty Fiber Optics and Optical Access Networks Shanghai University Shanghai 200072 China Key Laboratory of Advanced Display and System Applications Shanghai University Ministry of Education 200072 China

ISBN: (纸本)9781424458653

A novel blind separation algorithm based on double compression for single-channel JPEG permuted image was proposed in this paper. Firstly, the permuted image was compressed again, and then the primary compression factors were estimated by calculating the correlation coefficients of image blocks in pre and post recompression. Secondly, a 'mapping space' was constructed based on the primary compression factors estimated, according to different classification parameters in the mapping space, the activation region could be accurately detected and the permutation mixing matrixes were estimated. Lastly, the source image blocks could be completely recovered using permutation mixing matrix estimated. Simulation results show a high detection accuracy on the permuted image with uncompressed and without noised. Furthermore, the robustness against Gaussian noise and lossy JPEG compression of the algorithm were analyzed in this paper. ©2010 IEEE.

关键词： Mapping

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Non-reference virtual view quality evaluation of MVD

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Journal of Shanghai University(English Edition) 2011年第4期15卷 342-346页

作者：张艳安平张秋闻王元庆张兆杨 School of Communication and Information Engineering Shanghai University Department of Computer Science and Technology Anhui University of Finance and EconomicsBengbu 230030AnhuiP.R.China Key Laboratory of Advanced Display and System Application (shanghai University) Ministry of Education Department of Electronics Science and Engineering Nanjing University

The quality of virtual view based on multi-view video （MVD） plus depth format is often evaluated by PSNR or subjectively judged. However, due to synthesizing arbitrary view images, the virtual view images mostly have no reference images and are only assessed using non-reference. Virtual view images synthesized by depth estimation reference software （DERS） and view synthesis reference software （VSRS） often accompanied with blockiness and other distortions on the edge. In addition, matching level for the depth map and the corresponding texture maps of left and right views also affects the quality of the virtual view. This paper compares the edge similarity of the depth and the corresponding texture maps which generate the intermediate virtual view and combined with the virtual view＇s blockiness which causing blur to evaluate the quality of the virtual view. Experiment results show that the proposed method can reflect the quality of the virtual view better.

关键词： non-reference quality evaluation virtual view multi-view video （MVD） plus depth free viewpoint television （FTV）

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Depth estimation system suitable for hardware design

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Journal of Shanghai University(English Edition) 2011年第4期15卷 325-330页

作者：李贺建左一帆杨高波安平王建伟滕国伟 Key Laboratory of Advanced (Shanghai University) Display and System Application Ministry of EducationShanghai 200072P.R.China College of Computer and Communication Hunan UniversityChangsha 410082P.R.China School of Communication and Information Engineering Shanghai UniversityShanghai 200072P.R.China

Depth estimation is an active research area with the developing of stereo vision in recent years. It is one of the key technologies to resolve the large data of stereo vision communication. Now depth estimation still has some problems, such as occlusion, fuzzy edge, real-time processing, etc. Many algorithms have been proposed base on software, however the performance of the computer configurations limits the software processing speed. The other resolution is hardware design and the great developments of the digital signal processor （DSP）, and application specific integrated circuit （ASIC） and field programmable gate array （FPGA） provide the opportunity of flexible applications. In this work, by analyzing the procedures of depth estimation, the proper algorithms which can be used in hardware design to execute real-time depth estimation are proposed. The different methods of calibration, matching and post-processing are analyzed based on the hardware design requirements. At last some tests for the algorithm have been analyzed. The results show that the algorithms proposed for hardware design can provide credited depth map for further view synthesis and are suitable for hardware design.

关键词： 3-D TV （3DTV） depth estimation hardware design rank transform census transform

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