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Unsupervised detection of abnormal behavior for intelligent surveillance

Journal of Information and Computational Science 2014年第13期11卷 4805-4818页

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

A novel method based on dynamic particle flow has been developed to detect abnormal behavior automatically. The proposed approach starts by taking motion crowds as an aperiodic dynamical flow field to solve abnormal behavior detection problem. The motion in the scene is described by the particle trajectories computed by time integration of the dynamical flow field. Abnormal behavior is detected automatically based on some high-level features extracted from the developed particle flow without any hypothesis for the scene conditions in advance. The proposal does not require any object detection, tracking, or training in detecting abnormal behaviors. Comparative studies with some investigated methods have indicated the superior performance of the proposal in detecting abnormal behaviors from cluttered contents with dynamic scene variation and crowded environments. Copyright © 2014 Binary Information Press.

关键词： Flow fields

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Motion objects segmentation using a new level set based method

Lecture Notes in Computer Science (including subseries Lectu...

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Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) 2004年 3331卷 312-318页

作者： Bao, Hongqiang Zhang, Zhaoyang School of Communication and Information Engineering Shanghai University Shanghai 200072 China Key Laboratory of Advanced Displays and System Application Ministry of Education Shanghai 200072 China

Segmentation of moving object in a video sequence is one of the difficult problems in video processing. Moreover, multiple objects segmenting and extracting is more challenging task due to the complexity of multiple motion. This paper presents a novel multiple object segmentation approach based on spatial-temporal curve evolution. First, According to the characteristic of the intra-frame and inter-frame (spatial and temporal) information, a joint energy model is proposed with global and local features, thus, a curve evolution equation could be achieved based on the method of level set. Then, after an initial object model is achieved with a simplified method using the difference between two successive frames, multiple object are tracked and extracted with spatio-temporal curve evolution. Finally, while the occlusion is emerged due to multiple object overlapping motion, the covered/uncovered object could be segmented using motion field template matching. The experiment results show that the approach is effective. © Springer-Verlag Berlin Heidelberg 2004.

关键词： Template matching

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Study on the Reliability of High-power LEDs under Temperature Cycle

Study on the Reliability of High-power LEDs under Temperatur...

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2011 12th International Conference on Electronic Packaging Technology & High Density Packaging(2011 电子封装技术与高密度封装国际会议)

作者： Fan Huang Luqiao Yin Shuzhi Li Guangming Xu Huafeng Yan Yu Chen Jianhua Zhang Lianqiao Yang Key Laboratory of Advanced Display and System Applications (Shanghai University) School of Mechatron Key Laboratory of Advanced Display and System Applications (Shanghai University Shanghai Research Center of Eengineering and Technology for Semiconductor Lighting Shanghai Yaming Lighting co. Ltd.Ministry of Education.P.O.B 143 149 Yanchang Rd. Shanghai Univer Key Laboratory of Advanced Display and System Applications (Shanghai University) School of Mechatron

High-power LEDs have been widely used and have a big potential market due to the many advantages compared to conventional light sources. Reliability is one of the most important issues for the application of LEDs. In order to study the degradation mechanism and the stability of LED withstanding cyclical exposures to temperature variations, life test was carried out under temperature cycle testing. The experiment was designed basing on the EIAJ ED-4701/100. Four groups of 1 W high power LEDs adopting different material and structures were utilized. The temperature cycle accelerated life test under the condition of -25℃/125℃. After the accelerated test, the optical performance of the four kinds of devices were compared and analyzed, and the thermal performance of the LEDs was also tested, analyzed and discussed. At last, the reliability differences of high-power LEDs were analyzed and degradation mechanism of high power LEDs under temperature cycling was discussed.

关键词： Light emitting diodes Life estimation Reliability Thermal analysis Degradation Junctions Electronic packaging thermal management

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Totally Self Checking FSM Based on Convolutional Codes

Totally Self Checking FSM Based on Convolutional Codes

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

作者： Ming Li Fa-Yu Wan Jin-Sai Jiang Ming-Ming Peng Microelectronic Research & Development Center Key Laboratory of Advanced Display and System Applications Ministry of Education Shanghai University China

In this paper a new technique for designing totally self- checking finite state machines is presented using convolutional codes. In order to correct the fault, we propose a novel scheme which can not only detect, but also correct errors occurred in FSM transition. More specifically, we demonstrate the FSMs hardware which can be reused based on convolutional code partitioning and we formulate the optimization problem of maximizing hardware reusability. Synthesis results produced by our proposed procedure for the MCNC'89 FSM benchmark circuits show an average 20% reduction in literal counts compared to previous techniques. Moreover, we realize the IP core of the self-checking module by SMIC 0.25μm technology and also simulate its function in FPGA.

关键词： Convolutional codes Hardware Automata Circuit faults Electrical fault detection Fault detection Error correction Circuit synthesis Circuit simulation Field programmable gate arrays

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Tailoring memory performance via engineering conjugated bridges in benzo[c]thiadiazole based donor–acceptor small molecules

ChemPhysMater

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ChemPhysMater 2025年

作者： Wang, Xianglin Lian, Hong Zhao, Liang Qin, Zhitao Yang, Yongge Xiao, Tianxiao Wang, Shuanglong Dong, Qingchen MOE Key Laboratory of Advanced Display and System Applications Shanghai University No.149 Yanchang Road Jingan District Shanghai 200072 China School of Mechanical & Electronic Engineering and Automation Shanghai University No.99 Shangda Road Baoshan District Shanghai 200444 China School of Microelectronics Shanghai University No. 235 Chengbei Road Jiading District Shanghai 201800 China MOE Key Laboratory of Interface Science and Engineering in Advanced Materials Taiyuan University of Technology No.79 Yingze West Street Taiyuan 030024 China Faculty of Informatics and Engineering The University of Electro-Communications Tokyo 182-8585 Japan Department of Electronic Engineering The Chinese University of Hong Kong New Territories Hong Kong 999077 China

Tuning the conjugated bridges between the electron-donor and electron-acceptor moieties plays a crucial role in enhancing the memristive properties of organic materials, yet it is rarely reported. Herein, we designed and synthesized four donor–acceptor (D-A) organic small molecules, namely 4,7-bis(4-((9H-fluoren-9-ylidene)(phenyl)methyl)phenyl)benzo[c][1,2,5]thiadiazole (DF-BT), 4,7-bis((4-((9H-fluoren-9-ylidene)(phenyl)methyl)phenyl)ethynyl)benzo[c][1,2,5]thiadiazole (DF-ynl-BT), 4,7-bis(5-(4-((9H-fluoren-9-ylidene)(phenyl)methyl)phenyl)thiophen-2-yl)benzo[c][1,2,5]thiadiazole (DF-Th-BT), and 4,7-bis((5-(4-((9H-fluoren-9-ylidene)(phenyl)methyl)phenyl)thiophen-2-yl)ethynyl)benzo[c][1,2,5]thiadiazole (DF-Th-ynl-BT), featuring unique conjugated bridges. These molecules were employed as active layers in resistive random-access memory (RRAM) devices to systematically investigate the influence of conjugation bridges on the electrical parameters. The results revealed that devices based on DF-BT, DF-ynl-BT, and DF-Th-BT exhibited write-once-read-many-times (WORM) characteristics, while the DF-Th-ynl-BT-based device demonstrated stable Flash-type switching behavior. Compared to DF-BT, memory devices utilizing DF-ynl-BT, DF-Th-BT, and DF-Th-ynl-BT, which incorporate additional conjugated bridges, exhibited nonvolatile memory properties with reduced threshold voltages, an improved ON/OFF current ratio, enhanced stability, and better uniformity. These findings demonstrated that tailoring the conjugated bridges in D-A molecules can effectively modulate resistive memory behavior and enhance device performance. Furthermore, the DF-Th-ynl-BT-based device was successfully integrated into logic gate circuits and display functions, highlighting its significant potential for applications in artificial intelligence (AI) neural networks. © 2025

关键词： Charge transfer Conjugated bridge Flash Memory device WORM

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Ag_(3)PO_(4) decorated black urchin-like defective TiO_(2) for rapid and long-term bacteria-killing under visible light

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Bioactive Materials 2021年第6期6卷 1575-1587页

作者： Yingde Xu Xiangmei Liu Yufeng Zheng Changyi Li Kelvin Wai Kwok Yeung Zhenduo Cui Yanqin Liang Zhaoyang Li Shengli Zhu Shuilin Wu School of Materials Science&Engineering The Key Laboratory of Advanced Ceramics and Machining Technology By the Ministry of Education of ChinaTianjin UniversityTianjin300072China Hubei Key Laboratory of Polymer Materials Ministry-of-Education Key Laboratory for the Green Preparation and Application of Functional MaterialsSchool of Materials Science&EngineeringHubei UniversityWuhan430062China College of Engineering State Key Laboratory for Turbulence and Complex SystemDepartment of Materials Science and EngineeringPeking UniversityBeijing100871China Stomatological Hospital Tianjin Medical UniversityTianjin300070China Department of Orthopaedics&Traumatology Li Ka Shing Faculty of MedicineThe University of Hong KongPokfulamHong Kong999077China

Both phototherapy via photocatalysts and physical puncture by artificial nanostructures are promising substitutes for antibiotics when treating drug-resistant bacterial infectious ***,the photodynamic therapeutic efficacy of photocatalysts is seriously restricted by the rapid recombination of photogenerated electron-hole ***,the nanostructures of physical puncture are limited to two-dimensional(2D)platforms,and they cannot be fully used ***,this research developed a synergistic system of Ag_(3)PO_(4) nanoparticles(NPs),decorated with black urchin-like defective TiO_(2)(BU-TiO_(2-X)/Ag_(3)PO_(4)).These NPs had a decreased bandgap compared to BU-TiO_(2-X),and BU-TiO_(2)-X/Ag_(3)PO_(4)(3:1)exhibited the lowest bandgap and the highest separation efficiency for photogenerated electron-hole *** combination with BU-TiO_(2-X),the photostability of Ag_(3)PO_(4) improved because the oxygen vacancy of BU-TiO_(2-X) retards the reduction of Ag^(+) in Ag_(3)PO_(4) into Ag^(0),thus reducing its *** addition,the nanospikes on the surface of BU-TiO_(2-X) can,from all directions,physically puncture bacterial cells,thus assisting the hybrid’s photodynamic therapeutic effects,alongside the small amount of Ag^(+) released from Ag_(3)PO_(4).This achieves synergy,endowing the hybrid with high antibacterial efficacy of 99.76±0.15%and 99.85±0.09%against Escherichia coli and Staphylococcus aureus,respectively,after light irradiation for 20 min followed by darkness for 12 *** is anticipated that these findings may bring new insight for developing synergistic treatment strategies against bacterial infectious diseases or pathogenic bacterial polluted environments.

关键词： Antibacterial Ag_(3)PO_(4) Defective TiO_(2) Photocatalytic Puncture

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Uncalibrated Camera Vision Pointing Recognition for HCI

Uncalibrated Camera Vision Pointing Recognition for HCI

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IEEE International Conference on Computational Science and Engineering, CSE

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

Among gestures in non-verbal communication, pointing gesture can be taken as one of natural human computer interfaces. Vision based hand pointing is an optimal model for human-computer interaction (HCI). One of key problems among the vision based pointing gesture is how to recognize the pointing. Aiming at some limits existing in the literature, a novel method is developed to estimate pointing gestures based on some non-calibrated cameras. Multiple un-calibrated cameras are adopted to determine the pointing target based on pointing features extracted from multiple cameras and support vector machine (SVM) classifier. No explicit constraints are set on the cameras placement. Pointing user can move freely inside a wider interaction environment while pointing at some targets. The mentioned approach does not constrain the pointing surface whether is flat or not, or the target is visible by the cameras. Edge detection based on multi-scale wavelet transformation is used to extract pointing objects from a clutter background. Experiments have shown that the developed approach is efficient for pointing recognition by comparisons.

关键词： Cameras Support vector machines Image segmentation Human computer interaction Kernel Feature extraction Training

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Single camera vision pointing recognition for natural HCI

Single camera vision pointing recognition for natural HCI

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IET International Communication Conference on Wireless Mobile and Computing (CCWMC 2009)

作者： Ye-Peng Guan Hui-Jun Xiong Yun-Jie Yu School of Communication and Information Engineering Shanghai University China Key Laboratory of Advanced Displays and System Application Ministry of Education Shanghai China

A novel method is proposed to analyze pointing recognition based on a single un-calibrated camera. Face skin information is explicitly adopted as view quality in selecting the best view from multiple cameras. View measurement has been developed to overcome the effects from camera view directions and the distances between the user and the camera. No explicit constraints are set on the camera placement. Pointing users can move freely inside a wider interaction environment while pointing at some targets. The mentioned model does not constrain whether the pointing surface is flat or not. Experiments have highlighted that the proposed method is efficient and the performance of pointing recognition from the optimal viewpoint camera outperforms other cameras.

关键词：

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An Interlayer Strategy for Low-Voltage Thin-Film Organic Electrochemical Transistors

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Small Methods 2025年 e2500322页

作者： Zeng, Xi Peng, Chengyuan Shi, Wenpei Hu, Shengjie Cao, Yushi Wei, Huan Chen, Ping-An Xia, Jiangnan Ding, Jiaqi Zhang, Yu Gong, Zhenqi Chen, Huajie Lu, Naiyan Li, Rong Hu, Yuanyuan International Science and Technology Innovation Cooperation Base for Advanced Display Technologies of Hunan Province School of Physics and Electronics Hunan University Changsha 410082 China National Key Laboratory of Power Semiconductor and Integration Technology Engineering Research Center of Advanced Semiconductor Technology and Application of Ministry of Education College of Semiconductors (College of Integrated Circuits) Hunan University Changsha 410082 China Shenzhen Research Institute of Hunan University Shenzhen 518063 China School of Food Science and Technology Jiangnan University Wuxi 214122 China School of Biological Science and Medical Engineering Beihang University Xueyuan Street 37 Beijing 100191 China Key Laboratory of Environmentally Friendly Chemistry and Applications of Ministry of Education College of Chemistry Xiangtan University Xiangtan 411105 China Department of Stomatology The Second Xiangya Hospital Central South University Changsha 410013 China

Solid-state organic electrochemical transistors (SS-OECTs) are promising candidates for next-generation wearable and bioelectronic applications due to their high transconductance and low-voltage operation. However, conventional SS-OECTs rely on ion gels with high ionic liquid concentrations, which compromise mechanical robustness and scalability. This study addresses these limitations by developing thin-film OECTs (TF-OECTs) using solid electrolytes with significantly reduced ionic liquid concentrations and introducing a doped organic semiconductor film (DOSCF) as an interlayer between the gate and electrolyte. This strategy enables TF-OECTs to achieve film-like mechanical properties while maintaining high performance, including a maximum transconductance (g_m) of 5.05 mS, operational voltages below 1 V, and exceptional stability over 1000 switching cycles. The devices also exhibit superior flexibility, enduring over 2000 bending cycles with minimal performance degradation. Their potential is demonstrated in ferric ion sensing, achieving an ultralow detection limit of 15 nm with a high selectivity of 0.7 mA dec⁻¹, and in neuromorphic computing, where they emulate synaptic behaviors and achieve a 96.7% image recognition accuracy after training with artificial neural networks (ANN). These results highlight the transformative potential of TF-OECTs for integration into advanced, multifunctional electronic systems, combining high performance, mechanical robustness, and scalability. © 2025 Wiley-VCH GmbH.

关键词： flexibility ion sensors low voltage organic electrochemical transistors synaptic transistors

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Study on the application of thermal interface materials for integration of HP-LEDs

Study on the application of thermal interface materials for ...

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2010 IEEE CPMT Symposium Japan, ICSJ10

作者： Wu, Jun Zhuang, Meilin Li, Shuzhi Yang, Weiqiao Zhang, Jianhua School of Mechatronics Engineering and Automation Shanghai University Shanghai 200072 China Key Laboratory of Advanced Display and System Applications Ministry of Education Shanghai University Shanghai 200072 China Shanghai Research Center of Solid-state Lighting Engineering and Technology Shanghai 201203 China

ISBN: (纸本)9781424475940

Contact thermal resistance existed in the contact face between light emitting diode(LED) substrate and heat sink, which could hinder thermal conducting from PN junction to heat sinks, when mounting high power LEDs(HP-LEDs) devices on the heat sinks. Thermal interface materials(TIMs) were filled in the contact face to reduce contact thermal resistance. This paper studied the application of TIMs used in cooling LEDs, and three types of TIMs were studied by thermal test and optical-electro test. The experiment results presented that when select TIMs for LED mounting, thermal conductivity, thickness, and the volume of fillers should be considered. ©2010 IEEE.

关键词： Junction temperature

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