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Efficient Certificateless Conditional Privacy-Preserving Authentication Scheme with Dynamic Pseudonyms for VANETs

IEEE Sensors Journal 2025年

作者： Chen, Shangji Guan, Yepeng Shanghai University Key Laboratory of Advanced Display and System Application of Ministry of Education School of Communication and Information Engineering Shanghai China

Vehicular Ad hoc Networks (VANETs) are essential technology in intelligent transportation systems, enhancing traffic safety and improving traffic flow management. However, the increasing transmission of sensitive data raises serious security and privacy concerns. Existing certificateless aggregate signature (CLAS)-based authentication schemes face the following limitations in addressing these challenges: First, the complex construction leads to high computational overhead. Second, some schemes have security vulnerabilities and overlook physical-layer protection. Third, pseudonyms are tied to the key generated by trusted authority (TA) in a one-to-one relationship. To address these issues, we propose an efficient identity authentication scheme with conditional privacy-preserving, named ECPAS. By restructuring the existing CLAS scheme and utilizing pairing-free operations to achieve efficiency in computation. Also, ECPAS allows vehicles to cooperate with TA in generating dynamic pseudonyms and key pairs, avoiding key escrow and enhancing privacy. Moreover, the pseudonym of vehicle is generated by biometric identity and two hash seeds, so that the computation and storage overhead can be reduced efficiently under the condition that security is guaranteed. We performed formal and informal analysis that shows ECPAS satisfies the security requirements of VANETs. Finally, experimental results show that ECPAS outperforms existing schemes in computational cost, communication overhead, and transmission delay, and NS3-based simulations further validate its practicality and scalability. © 2001-2012 IEEE.

关键词： Street traffic control

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A Monolithically Integrated Voltage Reference based on AlGaN/GaN Schottky Gate HEMTs

A Monolithically Integrated Voltage Reference based on AlGaN...

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China International Forum o Solid State Lighting: International Forum on Wide Bandgap Semiconductors China (SSLChina: IFWS)

作者： Wenqing Lu Luqiao Yin Jianhua Zhang Kailin Ren Shanghai University Shanghai Key Laboratory of Chips and Systems for Intelligent Connected Vehicle Shanghai University Key Laboratory of Advanced Display and System Applications (Ministry of Education) School of Microelectronics Shanghai University Shanghai Collaborative Innovation Center of Intelligent Sensing Chip Technology Shanghai University Shanghai China

ISBN: (数字)9798331541149

ISBN: (纸本)9798331541156

In this work, a monolithically integrated voltage reference based on AlGaN/GaN Schottky Gate High Electron Mobility Transistor (SG-HEMTs) technology is proposed and studied by TCAD simulations. This simple but stable voltage reference consists of only two D-mode transistors with different threshold voltages, which can generate a predictable reference voltage (V REF ) and maintain high stability over a wide range of supply voltage and temperature. It is verified by TCAD simulations that V REF of 1.48V is realized for the power supply voltage range of 3.3 to 10 V. In the temperature range of 300 K to 500 K, the sensitivity of the VREF line is 0.064%/V and the temperature coefficient is 8.21 ppm/°C. The proposed design of the reference voltage source composed of double D-mode SG-HEMT exhibits high feasibility, and can be used in bias and detection circuits to reduce the circuit complexity and chip area.

关键词： Temperature sensors Temperature distribution Circuits HEMTs Logic gates Threshold voltage Generators Wide band gap semiconductors MODFETs Aluminum gallium nitride

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Simultaneous Improvement of Efficiency and Stability of Organic Light-Emitting Diodes Utilizing Bilayered Hole-Injection Layer Composed of Vanadium Oxide and Pedot:Pss

SSRN

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SSRN 2024年

作者： Zhang, Han Zhu, Wenqing Wu, Ming Feng, Zhiyin Huang, Lu Chen, Yipeng Dong, Yijie Yang, Yue School of Materials Science and Engineering Shanghai University 99 Shangda Road Shanghai200444 China Key Laboratory of Advanced Display and System Applications Ministry of Education Shanghai University 149 Yanchang Road Shanghai200072 China

The poor hole-injection and consequent carrier imbalance are regarded to be important factors that seriously restricts the device performance of organic light-emitting diodes (OLEDs). In this work, a solution-processable inorganic/organic bilayer composed of vanadium oxide (VOx)/poly(3,4-ethylenedioxythiophene):poly-(styrene sulfonate) (PEDOT:PSS) is reported as a hole-injection layer (HIL) in OLED to customize matched interfacial energy level alignment. This strategy not only facilitates the formation of a smooth PEDOT:PSS overlayer in the VOx/PEDOT:PSS bilayer, but also enhances the hole-injection across the interface through the construction of step-wise energy levels and hence improves carrier balance in device. Consequently, it was found that the device with VOx/PEODT:PSS bilayered HIL exhibited a maximum current efficiency of 67.23 cd A-1 and a maximum external quantum efficiency of 19.17%, which were obviously superior to those of the reference devices with individual VOx HIL (54.85 cd A-1, and 15.58%, respectively) and PEDOT:PSS HIL (58.74 cd A-1, and 16.84%, respectively). Meanwhile, the stability of bilayered HIL-based device was improved substantially because the stable VOx layer effectively prevented the corrosion of indium tin oxide (ITO) anode by acidic PEDOT:*** study highlights a promising bilayer for developing high-performance OLEDs. © 2024, The Authors. All rights reserved.

关键词： Tin oxides

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Subthreshold Swing Model of GaN-Based Fin-Gate High Electron Mobility Transistors

Subthreshold Swing Model of GaN-Based Fin-Gate High Electron...

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China International Forum o Solid State Lighting: International Forum on Wide Bandgap Semiconductors China (SSLChina: IFWS)

作者： Hanlin Yang Jiayi Yang Tiantian Guan Kailin Ren School of Microelectronics Shanghai University Shanghai China Key Laboratory of Advanced Display and System Applications (Ministry of Education) Shanghai University Shanghai China Shanghai Key Laboratory of Chips and Systems for Intelligent Connected Vehicle Shanghai University Shanghai China

Compared to the traditional HEMTs, better gate control ability especially smaller subthreshold swing, can be achieved with a fin-gate structure, which can be widely used in power, RF circuits. However, there has been few works related to subthreshold swing reported previously. In this study, a Fin- HEMT device is investigated by TCAD simulation, and a subthreshold swing model was constructed. The simulation results verify the performance of the model. According to the simulation results, with an error of less than 6%, this work provide design guidlines for the research of Fin-HEMT devices.

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Mitigating interfacial carrier crowding by an ultrathin LiF interlayer towards efficient and stable perovskite light‑emitting diodes

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Moore and More 2024年第1期1卷 1-9页

作者： Xiaofei Zhang Lin Wang Lingmei Kong Sheng Wang Jun Dai Guohua Jia Xuyong Yang Key Laboratory of Advanced Display and System Applications of Ministry of Education Shanghai UniversityShanghai 200072China Shanghai Engineering Research Center for Integrated Circuits and Advanced Display Materials Shanghai UniversityShanghai 201899China Department of Physics Jiangsu University of Science and TechnologyZhenjiang 212100JiangsuChina School of Molecular and Life Sciences Curtin UniversityGPO Box U1987PerthWA 6845Australia

Quasi-two-dimensional(quasi-2D)perovskite-based light-emitting diodes(PeLEDs)have attracted intensive attention due to their high quantum yields,tunable emission wavelengths,and solution-processing capability,showing great potential in next-generation display and lighting ***,further performance enhancement in PeLEDs is severely limited by the uncontrolled transfer of charge carriers under bias,leading to crowding of interfacial carriers and severe efficiency ***,we insert an ultra-thin dielectric buffer layer of lithium fluoride(LiF)into the electron transport layer(ETL)to regulate the transfer dynamics of electrons and passivate the interfacial defects *** dielectric LiF interlayer can effectively reduce the efficiency roll-off in PeLEDs by improving the charge balance through preventing the overwhelm-ing injection of ***,the fluoride anions from LiF can passivate the surface defects of the perovskite film,enhancing the radiative *** a result,the LiF interlayer-assisted quasi-2D PeLED presents an outstanding external quantum efficiency(EQE)of 24.03%and a maximum brightness of 30845 cdm^(-2).The operational stability of the device is also extended,with a half-lifetime(T_(50))of 71.28 min(at an initial luminance of 1000 cdm^(-2)),which is 7.4-fold longer than that for the control device.

关键词： Perovskite light-emitting diodes Efficiency roll-off LiF interlayer Charge balance Defect passivation

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Photothermy-strengthened photocatalytic activity of polydopamine-modified metal-organic frameworks for rapid therapy of bacteria-infected wounds

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Journal of Materials Science & Technology 2021年第3期62卷 83-95页

作者： Donglin Han Yuan Li Xiangmei Liu Kelvin Wai Kwok Yeung Yufeng Zheng Zhenduo Cui Yanqin Liang Zhaoyang Li Shengli Zhu Xianbao Wang Shuilin Wu School of Materials Science&Engineering The Key Laboratory of Advanced Ceramics and Machining Technology by the Ministry of Education of ChinaTianjin UniversityTianjin 300072China Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials Ministry-of-Education Key Laboratory for the Green Preparation and Application of Functional MaterialsHubei Key Laboratory of Polymer MaterialsSchool of Materials Science&EngineeringHubei UniversityWuhan 430062China Department of Orthopaedics&Traumatology Li Ka Shing Faculty of MedicineThe University of Hong KongPokfulamHong Kong 999077China State Key Laboratory for Turbulence and Complex System and Department of Materials Science and Engineering College of EngineeringPeking UniversityBeijing 100871China

Herein,a metal-organic framework(MOF)was modified using polydopamine(PDA)to develop the MOFPDA as a photoresponsive bacteria-killing agent under 660 nm light *** modification using PDA led to the production of not only more heat,but also much more~1O_(2).This is because the PDA could interact with the porphyrin ring of the MOF throughπ-πinteraction and the charge transfer between PDA and the MOFs decreases the ene rgy of the band of hybrid *** addition,greater levels of hyperthermia induced by PDA modification accelerated the charge trans fe r,which significantly strengthened the photocatalytic perfo rmance of MO ***,after modification,the light abso rbance and water dispersibility of nanoparticles were both enhanced;both are important for the improvement of photocatalytic and photothermal ***,MOF-PDA exhibited the highly effective antibacterial efficacy of 99.62%and 99.97%against Staphylococcus aureus and Escherichia coli,respectively,under 20 min 660 nm light irradiation.

关键词： Metal-organic framework Photosensitizer Antibacterial Photothermal Wound healing

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Thick films of polymer Direct-conversion X-ray detectors

Thick films of polymer Direct-conversion X-ray detectors

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Electronics Packaging Technology Conference (EPTC)

作者： Hu Chen Yi Li Zhao Hao Xingyang Wu Jianhua Zhang The Key Laboratory of Advanced Display and System Application Ministry of Education Shanghai University Shanghai China Shanghai University Shanghai China

ISBN: (纸本)9781665416207

Organic conjugated polymers have been widely used in the field of X-ray detectors because of their simple processing, mechanical flexibility and low cost. In this paper, we report a vertical structure X-ray detector using PDMS material which is fabricated by simple process steps. The response of pure PDMS material to X-ray is verified, and the effects of different process conditions on the device performance were tested. The detector with film forming speed 2000 rpm and curing temperature 60°C still has high sensitivity $\left (434.5 \mu \mathrm{CGy}_{\text {air }}^{-1} \mathrm{~cm}^{-2}\right)$ to low dose rate $\left(23.9 \mu \mathrm{Gy}_{\text {air }}\text{S}^{-1}\right)$ when the applied bias voltage is 150 V. Finally, the device provides an idea for the development of low cost and high performance flexible direct X-ray detectors.

关键词： Performance evaluation Temperature sensors Micrometers X-ray detectors Sensitivity Costs Voltage

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Lateral Etched Tunnel Junction Apertures for 1.3μm Vertical-Cavity Surface-Emitting Lasers 4th

Lateral Etched Tunnel Junction Apertures for 1.3μm Vertical...

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4th International Conference on Telecommunications and Communication Engineering, ICTCE 2020

作者： Liu, Cheng Wu, Huizhen School of Microelectronics Shanghai University Shanghai200444 China Key Laboratory of Advanced Display and System Applications of Ministry of Education Shanghai University Shanghai200072 China State Key Laboratory of Functional Materials for Informatics Shanghai Institute of Microsystem and Information Technology Chinese Academy of Sciences Shanghai200050 China Department of Physics Zhejiang University Zhejiang Hangzhou310027 China

ISBN: (纸本)9789811656910

1.3μm wafer-bonded vertical-cavity surface-emitting lasers are fabricated, which employ lateral etched p+-InAlAs/n+-InP tunnel junctions as confinement apertures. The VCSEL with a 5μm-diameter aperture exhibits CW operation with threshold current of 0.55 mA, maximum operation temperature up to 82 °C and single-transverse mode emission. The relationship between temperature-dependent characteristics and aperture sizes are discussed. The lateral etched p+-InAlAs/n+-InP tunnel junction aperture is attractive as confinement for high performance wafer-bonded long wavelength VCSELs. © 2022, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Surface emitting lasers

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Design of a Capsule Robot system for Gastric Hemorrhage Detection using Luminol 20

Design of a Capsule Robot System for Gastric Hemorrhage Dete...

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20th IEEE International Conference on Mechatronics and Automation, ICMA 2023

作者： Mao, Yuchen Guo, Jian Guo, Shuxiang Fu, Qiang Tianjin University of Technology Tianjin Key Laboratory for Control Theory & Application Complicated Systems Intelligent Robot Laboratory School of Electrical Engineering and Automation Binshui Xidao Extension 391 Tianjin300384 China Shenzhen Institute of Advanced Biomedical Robot Co. Ltd No.12 Ganli Sixth Road Jihua Street Longgang District Shenzhen518100 China Key Laboratory of Convergence Medical Engineering System and Healthcare Technology The Ministry of Industry and Information Technology School of Life Science Beijing Institute of Technology No.5 Zhongguancun South Street Beijing100081 China

ISBN: (纸本)9798350320831

Gastric hemorrhage in upper gastrointestinal bleeding is an obvious indicator of deteriorating gastric disease. This paper proposes a capsule robot system for detecting bleeding in the stomach. The patient ingests a capsule robot containing luminol reagent, which detects bleeding in the stomach via chemiluminescence. The MCU receives the optical sensor signal, and the data is transmitted via radio frequency. The external lower computer receives and forwards the data to the upper computer for processing and display. The data is used to determine the presence and amount of stomach bleeding. Chemiluminescence is an excellent sensor, requiring no external energy supply, and demonstrating excellent sensitivity and selectivity. Combining chemical and electronic sensors presents opportunities for further development. Capsule robot detection reduces the discomfort and risk of secondary injury associated with traditional endoscopy. This paper establishes an experimental platform using porcine blood to simulate human blood, demonstrating the feasibility of the system. © 2023 IEEE.

关键词： Chemiluminescence

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Photothermal-controlled sustainable degradation of protective coating modified Mg alloy using near-infrared light

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Rare Metals 2021年第9期40卷 2538-2551页

作者： Zhi-Xin Han Xiang-Mei Liu Lei Tan Zhao-Yang Li Yu-Feng Zheng Kelvin Wai-Kwok Yeung Zhen-Duo Cui Yan-Qin Liang Sheng-Li Zhu Shui-Lin Wu Hubei Key Laboratory of Polymer Materials Ministry-of-Education Key Laboratory for the Green Preparation and Application of Functional MaterialsSchool of Materials Science&EngineeringHubei UniversityWuhan 430062China The Key Laboratory of Advanced Ceramics and Machining Technology by the Ministry of Education of China School of Materials Science&EngineeringTianjin UniversityTianjin 300072China State Key Laboratory for Turbulence and Complex System Department of Materials Science and EngineeringCollege of EngineeringPeking UniversityBeijing 100871China Department of Orthopaedics and Traumatology Li Ka Shing Faculty of MedicineThe University of Hong KongPokfulam 999077Hong KongChina

Controlling the corrosion rate is critical for practical applications of Mg-based alloys. In this work, we constructed a protective coating of hybrid polycaprolactone(H-PCL)/indocyanine green(ICG) on AZ31 Mg alloy,whose degradation rate was controlled by 808-nm nearinfrared(NIR) light irradiation. The corrosion behaviors of H-PCL/ICG coated Mg alloys were systematically investigated by potentiodynamic polarization tests, electrochemical impedance spectroscopy(EIS) and hydrogen evolution experiments. The results disclosed that the H-PCL/ICG composite coating could effectively protect Mg alloy from corroding without NIR light irradiation. In contrast, under 808-nm NIR light irradiation, the corrosion resistance of this composite coating was decreased significantly, i.e., the corrosion current density(i_(corr))increasedfrom(8.81 ± 1.068) 9 10^(-8) to(1.22 ± 0.545) 9 10^(-6) A·cm^(-2). This is because the component of ICG in the coating was excited to produce heat locally, which triggered the glass transition temperature(T_(g)) of H-PCL in the coating, resulting in the motion of the molecular chain segment. Consequently, the electrolytes penetrated the coating and corroded the Mg substrate. In vitro biological experiment indicated that the synthesized coating exhibited good ***, these findings will provide a new strategy for designing novel photoresponsive coatings to remotely adjust the degradation rate of biodegradable metals for biomedical applications.

关键词： Magnesium Corrosion Coating Photoresponsive Surface modification

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