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作者： Bai, Y. Liu, X. Chen, L. Zhu, W.Q. Jiang, X.Y. Zhang, Zh.L. Key Laboratory of Advanced Display and System Application Ministry of Education Shanghai University Shanghai 200072 China Department of Materials Science Shanghai University Jiading Campus Shanghai 201800 China

ISBN: (纸本)9787561752289

An organic thin-film transistor (OTFTs) having MoO3/Al electrode and OTS/SiO2 bilayer gate insulator configuration between gate insulator and source/drain electrodes is investigated. Thermal SiO2 layer grown is used as the OTFT gate dielectric;Copper phthalocyanine(CuPc) is used as an active layer. We have found that using silane coupling agents-octade-cyltrichlorosilane (OTS) to reduce the surface energy of the SiO2 gate dielectric and significantly improve device performance. This OTS/SiO2 bilayer gate insulator configuration increases the field-effect mobility, reduces the threshold voltage, and improves the on/off ratio at the same time. The device with MoO3/AI electrode had similar Ids compared to the device with Au electrode at same gate voltage. MoO3/AI was proved to be a superior electrode. Our results indicate that using double-layer of electrode and double-layer of insulator is an effective way to improve OTFT performance.

关键词： Silica

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High efficiency and dynamic modulation of nonlinear metasurfaces

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Light(Science & applications) 2024年第11期13卷 2424-2426页

作者： Ruizhe Zhao Lingling Huang Beijing Engineering Research Center of Mixed Reality and Advanced Display MIIT Key Laboratory of Photoelectronic Imaging Technology and System of Ministry of Education of ChinaSchool of Optics and PhotonicsBeijing Institute of TechnologyBeijing 100081China

Metasurfaces have facilitated numerous innovative applications in the scope of nonlinear ***,dynamically tuning the nonlinear response at the pixel level is very *** work proposed a novel method to electrically manipulate the local amplitude and phase of third-harmonics generation(THG)by integrating the giant nonlinear responses resulting from intersubband transitions of multiple quantum wells(MQW)with plasmonic *** demonstrated method may pave the way to realize nonlinear optical elements with versatile functionalities by electrically tuning and promoting the advancements of innovative applications such as lidar,3D displays,optical encryption,optical computing,and so on.

关键词： nonlinear harmonics integrating

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A deep learning framework for face verification without alignment

A deep learning framework for face verification without alig...

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作者： Fan, Zhongkui Guan, Ye-peng School of Communication and Information Engineering Shanghai University Shanghai China Key Laboratory of Advanced Displays and System Application Ministry of Education Shanghai China

Most of the CNN (convolutional neural networks) methods require alignment, which will affect the efficiency of verification. This paper proposes a deep face verification framework without alignment. First and foremost, the framework consists of two training stages and one testing stage. In the first training stage, the CNN is fully trained on the large face dataset. In the second training stage, embedding triplet is adopted to fine-tune the models. Furthermore, in the testing stage, SIFT (scale invariant feature transform) descriptors are extracted from intermediate pooling results for cascading verification, which effectively improves the accuracy of face verification without alignment. Last but not least, two CNN architectures are designed for different scenarios. The CNN1 (convolutional neural networks 1), with fewer layers and parameters, requires a small amount of memory and computation in training and testing, so it is suitable for real-time system. The CNN2 (convolutional neural networks 2), with more layers and parameters, has excellent face verification. Through the long-term training on WEB-face dataset and experiments on the LFW (labled faces in the wild), YTB (YouTube) datasets, the results show that the proposed method has superior performance compared with some state-of-the-art methods. © 2020, Springer-Verlag GmbH Germany, part of Springer Nature.

关键词： Convolutional neural networks

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Extended application of scalable video coding methods

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2nd International Conference on Image Analysis and Recognition, ICIAR 2005

作者： Li, Zhi-Gang Zhang, Zhao-Yang Wu, Biao Zhang, Ying School of Communication and Information Engineering Shanghai University Shanghai 200072 China Key Laboratory of Advanced Displays and System Application Ministry of Education China

ISBN: (纸本)3540290699

SP(Synchronization-Predictive) frame coding, which enables high efficiency of switching between two video bitstreams with different qualities, is supported by H.264/AVC. And FGS(Finc-Granular-Scalability) coding is supported by MPEG-4 video standard. This paper proposes a solution for combination these two tools with each other so as to adapt to high bandwidth variations of Internet or wireless networks and to low bandwidth variations flexibly for transmitted video streams. Experimental results show that our proposed system outperforms FGS coding by 0.47dB and the H.264/AVC-based video stream switching approach by 0.23dB on average. © Springer-Verlag Berlin Heidelberg 2005.

关键词： Image analysis

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Real-time fall detection based on global orientation and human shape

Real-time fall detection based on global orientation and hum...

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3rd International Conference on Computer Engineering and Network, CENet 2013

作者： Wang, Shuangcheng Guan, Yepeng Xu, Ruiyue School of Communication Information Engineering Shanghai University Shanghai 201305 China Key Laboratory of Advanced Displays and System Application Shanghai 201305 China

ISBN: (纸本)9783319017655

Fall detection is an important problem in the research of abnormal behavior recognition. In this chapter, a novel real-time method is proposed to detect human fall with a single uncalibrated camera by the changes of global orientation and human shape. Our algorithm has three basic parts: moving object extraction, fall pre-detection, and fall confirmation. The overall orientations are derived from the combination of Gaussian mixture model and motion history image. The shape deformation is quantified from the silhouettes by an approximated bounding box. Standard deviations of the overall orientation and aspect ratio of bounding box are checked to pre-detect a fall, and a fall is confirmed by unmoving shape of the bounding box with the defined fall angle. Experimental results show that our method can detect all possible types of human fall accurately and successfully. © 2014 Springer International Publishing Switzerland.

关键词： Aspect ratio

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Bright hybrid white light-emitting quantum dot device with direct charge injection into quantum dot

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Chinese Physics B 2016年第12期25卷 514-519页

作者：曹进谢婧薇魏翔周洁陈超平王子兴田哲圭 Key Laboratory of Advanced Display and System Applications Ministry of EducationShanghai University School of Materials Science and Engineering Shanghai University National Engineering Laboratory of TFT-LCD Materials and Technologies Department of Electronic EngineeringShanghai Jiao Tong University School of Green Energy & Semiconductor Engineering Hoseo University

A bright white quantum dot light-emitting device （white-QLED） with 4-[4-（1-phenyl-lH-benzo[d]imidazol-2- yl）phenyl]-2- [3-（tri-phenylen-2-yl）phen-3-yl]quinazoline deposited on a thin film of mixed green/red-QDs as a bilayer emitter is fabricated. The optimized white-QLED exhibits a turn-on voltage of 3.2 V and a maximum brightness of 3660 cd/m2 @8 V with the Commission Internationale de l＇Eclairage （CIE） chromaticity in the region of white light. The ultra-thin layer of QDs is proved to be critical for the white light generation in the devices. Excitation mechanism in the white-QLEDs is investigated by the detailed analyses of electroluminescence （EL） spectral and the fluorescence lifetime of QDs. The results show that charge injection is a dominant mechanism of excitation in the white-QLED.

关键词： quantum dot light-emitting devices white ultra-thin film charge injection

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Video nature considerations for multi-frame selection algorithm in H.264

Video nature considerations for multi-frame selection algori...

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ACS/IEEE International Conference on Computer systems and applications

作者： Liquan Shen Zhi Liu Zhaoyang Zhang Guozhong Wang Key Laboratory of Advanced Display and System Application Ministry of Education Shanghai University Shanghai China

H.264 allows motion estimation performing on multiple reference frames. This new feature improves the prediction accuracy of inter-coding blocks significantly. However, the coding gain comes at the cost of a much higher computational complexity. The reference software JM adopts full search scheme, and the computational complexity of motion estimation increases linearly with the number of allowed reference frames. In fact, the reduction of prediction residues is highly dependent on the nature of sequences, not on the number of searched frames. In this paper, with consideration of video nature and the available information from previous searched reference frames, an adaptive multi-frame selection algorithm (AMFSA) is proposed to speed up the matching process for multiple reference frames in the H.264 video coding system. The proposed algorithm can effectively reduce 63.6% on average.

关键词： Motion estimation Computational complexity Video coding Information analysis Testing application software Accuracy Costs Statistical analysis Statistical distributions

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Compressed sensing based channel estimation using group random unit pilot for OFDM systems in fast moving environment~

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High Technology Letters 2011年第2期17卷 113-118页

作者：方勇 Zhou Xiaoping Wang Min School of Communication and Information Engineering Key laboratory of Specialty Fiber Optics and Optical Access Networks Shanghai University Shanghai 200072 P. R. China Key Laboratory of Advanced Display and System Applications Shanghai 200072 P. R. China

A compressed sensing （CS） based channel estimation algorithm is proposed in the fast moving environment. A sparse basis expansion channel model in both time and frequency domain is *** are placed according to a novel random unit pilot matrix （RUPM） to measure the delay- Doppler sparse channel. The sparse channels are recovered by an extension group orthogonal matching pursuit （GOMP） algorithm, enjoying the diversity gain from multi-symbol processing. The relatively nonzero channel coefficients are estimated from a very limited number of pilots at a sampling rate significantly below the Nyquist rate. The simulation results show that the new channel estimator can provide a considerable performance improvement for the fast fading channels. Three significant reductions are achieved in the required number of pilots, memory requirements and computational complexity.

关键词： compressed sensing ( CS) channel estimation fast fading sparse channel basis expansion

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An adaptive early termination of mode decision using inter-layer correlation in scalable video coding

An adaptive early termination of mode decision using inter-l...

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IEEE International Conference on Image Processing

作者： Liquan Shen Zhi Liu Ping An Ran Ma Zhaoyang Zhang Key Laboratory of Advanced Display and System Application Ministry of Education Shanghai University Shanghai China

The scalable video coding (SVC) standard adopts the variable size motion estimation (ME) to select the best coding mode for each macroblock (MB). Although this technique achieves the highest possible coding efficiency, it results in extremely large computation complexity which obstructs SVC from the practical application. In this paper, we propose an adaptive early termination of fast mode decision algorithm in SVC. It makes use of the coding information of spatial neighbor MBs and the corresponding MBs in base layer to early terminate the mode decision procedure. Experimental results show that the proposed fast mode decision algorithm can achieve computational saving up to 67% with no significant loss of rate distortion (RD) performance.

关键词： Encoding Correlation Video coding Image coding Static VAr compensators Mobile communication PSNR

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A Novel Monolithically Integrated Structure of GaN-based Micro-LED and its Driver HEMT 18

A Novel Monolithically Integrated Structure of GaN-based Mic...

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18th China International Forum on Solid State Lighting and 7th International Forum on Wide Bandgap Semiconductors, SSLChina: IFWS 2021

作者： An, Yuan Ren, Kailin Xiu, Xueying Xu, Zebin Wu, Zhuang Yin, Luqiao Zhang, Jianhua School of Microelectronics Shanghai University Key Laboratory of Advanced Display and System Applications Shanghai University Shanghai University Shanghai200444 China

ISBN: (纸本)9781665495462

In this work, a novel LED-HEMT integrated device structure with a p-GaN cap layer under the drain electrode of HEMT and one or more InGaN layers inserted between AlGaN/GaN is proposed for the monolithic integration of GaN-based Micro-LED and its driver HEMT. This structure is a promising candidate for the optoelectronic switch in high-speed visible light communications owing to its elimination of metal-interconnects and reduction of parasitic capacitance. By TCAD simulations, the distribution of radiative recombination rate in this structure is investigated and the 2-D integrals of the radiative recombination rate for various device structure designs are compared. It is concluded that the integration structure with InGaN layers provides higher radiative recombination than that without InGaN layers. Device structure parameters are optimized, including Al content in AlGaN barrier layer, In content in InGaN layers, and thickness of InGaN layers. © 2021 IEEE.

关键词： III-V semiconductors

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