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Stationary distributions for two-dimensional sticky Brownian motions:Exact tail asymptotics and extreme value distributions

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Science China Mathematics 2021年第11期64卷 2539-2562页

作者： Hongshuai Dai yiqiang Q.zhao School of Statistics Shandong University of Finance and EconomicsJinan 250014China School of Mathematics and Statistics Carleton UniversityOttawaON K1S 5B 6Canada

Sticky Brownian motions can be viewed as time-changed semimartingale reflecting Brownian motions,which find applications in many areas including queueing theory and mathematical *** this paper,we focus on stationary distributions for sticky Brownian *** results obtained here include tail asymptotic properties in the marginal distributions and joint *** kernel method,copula concept and extreme value theory are the main tools used in our analysis.

关键词： sticky Brownian motion queueing model stationary distribution exact tail asymptotic kernel method extreme value distribution

Curvature Compensated CMOS Bandgap Reference with Novel Process Variation Calibration Technique

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Journal of Beijing Institute of Technology 2018年第2期27卷 182-188页

作者： Jiancheng Zhang Mao Ye yiqiang zhao Gongyuan zhao Tianjin Key Laboratory of Imaging and Sensing Microelectronic Technology Tianjin UniversityTianjin 300072China Tianjin Infrared Imaging Technology Engineering Center Tianjin 300072China

A lowtemperature coefficient（ TC） bandgap reference（ BGR） with novel process variation calibration technique is proposed in this paper. This proposed calibration technique compensating both TC and output value of BGR achieves fine adjustment step towards the reference voltage,while keeping optimal TC by utilizing large resistance to help layout match. The high-order curvature compensation realized by poly and p-diffusion resistors is introduced into the design to guarantee the temperature characteristic. Implemented in 180 nm technology,the proposed BGR has been simulated to have a power supply rejection ratio（ PSRR） of 91 dB@100 Hz. The calibration technique covers output voltage scope of 0. 49 V-0. 56 Vwith TC of 9. 45 × 10^（-6）/℃-9. 56 × 10^（-6）/℃ over the temperature range of-40 ℃-120 ℃. The designed BGR provides a reference voltage of 500 mV,with measured TC of 10. 1 × 10^（-6）/℃.

关键词： bandgap reference voltage process variation resistance-trimming current-calibration curvature compensation temperature coefficient

Light-tailed behavior of stationary distribution for state-dependent random walks on a strip

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Frontiers of Mathematics in China 2014年第4期9卷 813-834页

作者： Wenming HONG Meijuan ZHANG yiqiang Q. zhao School of Mathematical Sciences & Laboratory of Mathematics and Complex Systems Beijing Normal University Beijing 100875 China School of Statistics and Mathematics Central University of Finance and EconomicsBeijing 100081 China School of Mathematics and Statistics Carleton University Ottawa Ont K1S 5B6 Canada

We consider the state-dependent reflecting random walk on a half- strip. We provide explicit criteria for （positive） recurrence, and an explicit expression for the stationary distribution. As a consequence, the light-tailed behavior of the stationary distribution is proved under appropriate conditions. The key idea of the method employed here is the decomposition of the trajectory of the random walk and the main tool is the intrinsic branching structure buried in the random walk on a strip, which is different from the matrix-analytic method.

关键词： Random walk on a strip stationary distribution light-tailedbehavior branching process recurrence state-dependent

Golden chip free Trojan detection leveraging probabilistic neural network with genetic algorithm applied in the training phase

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Science China(Information Sciences) 2020年第2期63卷 242-244页

作者： Yanjiang LIU Jiaji HE Haocheng MA yiqiang zhao School of Microelectronics Tianjin University

Dear editor,Hardware Trojan has become a serious threat to the trustworthiness of critical applications [1].Among all existing detection approaches, golden chip-free Trojan detection approaches have attracted wide attention in [2]. Recently, various supervised learning techniques are applied to the golden chip-free Trojan detection approaches [3].

关键词： simulation Golden chip free Trojan detection leveraging probabilistic neural network with genetic algorithm applied in the training phase

A study of residual characteristics in floating gate transistors

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Science China(Information Sciences) 2018年第6期61卷 250-252页

作者： Jia WANG yiqiang zhao Ruishan XIN Mao YE School of Microelectronics Tianjin University Tianjin Key Laboratory of Imaging and Sensing Microelectronic Technology Tianjin University

Dear editor,The floating gate transistor is a device that has been extensively applied to non-volatile memories,such as EEPROM and Flash *** residual characteristics of floating gate transistors after program and eras... 详细信息

关键词： cycle A study of residual characteristics in floating gate transistors

A sub-1 V high-precision CMOS bandgap voltage reference

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Journal of Semiconductors 2012年第2期33卷 138-142页

作者： Liao Jun zhao yiqiang Geng Junfeng School of Electronic Information Engineering Tianjin UniversityTianjin 300072China

A third-order,sub-1 V bandgap voltage reference design for low-power supply,high-precision applications is *** design uses a current-mode compensation technique and temperature-dependent resistor ratio to obtain high-order curvature *** circuit was designed and fabricated by SMIC 0.18μm CMOS *** produces an output reference of 713.6 *** temperature coefficient is 3.235 ppm/℃in the temperature range of-40 to 120℃,with a line regulation of 0.199 mV/V when the supply voltage varies from 0.95 to 3 *** average current consumption of the whole circuit is 49μA at the supply voltage of 1 V.

关键词： bandgap reference curvature compensation low power supply low temperature coefficient

High-efficient generation algorithm for large random active shield

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Science China(Information Sciences) 2019年第3期62卷 211-213页

作者： Ruishan XIN Yidong YUAN Jiaji HE Yuehui LI yiqiang zhao School of Microelectronics Tianjin University Tianjin Key Laboratory of Imaging and Sensing Microelectronic Technology Tianjin University

Dear editor,Security integrated circuits play important roles in trusted platform modules [1], embedded devices, etc. However, invasive attacks [2] are serious threats on such circuits. Active shield is regarded as an... 详细信息

关键词： DC High-efficient generation algorithm for large random active shield CMA Pb

Paraffin/SiC as a Novel Composite Phase-Change Material for a Lithium-Ion Battery Thermal Management System

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Transactions of Tianjin University 2021年第1期27卷 55-63页

作者： Wei Kang yiqiang zhao Xueheng Jia Lin Hao Leping Dang Hongyuan Wei School of Chemical Engineering and Technology Tianjin UniversityTianjin 300072China Tianjin Lishen Battery Joint-Stock Co. LtdTianjin 300072China

A lithium-ion battery thermal management system has always been a hot spot in the battery industry. In this study, a novel high-thermal-conductivity composite phase-change material(CPCM) made by paraffin wax and silicon was adopted to facilitate heat transfer. Moreover, high resistance or even insulation of CPCM is capable of preventing short circuits between the cells. The heat transfer mechanism of CPCMs was determined under a scanning electron microscope. A thermogravimetric analyzer was employed to determine the thermal stability. A diff erential scanning calorimeter was used to explore the thermophysical properties of the composite samples. By comparing the results of the experiment, it was reported that under the silicon carbide content of 5%, the parameters were better than others. The phase-change enthalpy of CPCM was 199.4 J/g, the leakage rate of liquid was 4.6%, and the melting point was 53.6℃. To verify the practicality of CPCM, a three-dimensional layered battery pack model was built in the COMSOL Multiphysics software. By simulating the thermal runaway inside the battery packs of various materials, it was reported that the addition of CPCM significantly narrowed the temperature range of the battery pack from 300–370 to 303–304 K. Therefore, CPCM can eff ectively increase the rate of heat transfer to prevent the chain of thermal runaway reactions. It also enables the battery pack to run at a stable temperature.

关键词： Lithium-ion battery Phase-change material Paraffin Silicon carbide Thermal runaway

Design and implementation of an efficient SDRAM controller for HDTV decoder

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High Technology Letters 2007年第4期13卷 402-406页

作者：王晓辉 zhao yiqiang Xie Xiaodong Wu Di Zhang Peng School of Electronic and Information Engineering Tianjin University Tianjing 300072 P.R. China Institute of Computing Technology Chinese Academy of Sciences Beijing 10（1080 P.R. China Grandview Semiconductor Inc Beijing 100085 P.R. China

A high performance SDRAM controller for HDTV decoder is designed. MB-based （ macro block） address mapping, adaptive-precharge and command interleaving are adopted in this controller. MB-based address mapping reduces the precharge operations of the video processing unit in one access; adaptive- precharge avoids unnecessary precharge operations; while command interleaving inserts the precharge and activate commands of the next access into the command sequence of the current access, thus reduces the no operation （NOP） cycles. Combination of these three schemes effectively improves the SDRAM performance. Compared with precharge-all scheme, adaptive-precharge and command interleaving reduce the SDRAM overhead cycles by 70% and increases SDRAM performance by up to 19.2% in the best case. This controller has been implemented in an AVS SoC and the frequency is 200MHz.

关键词： SDRAM controller MB-based address mapping adaptive-precharge command interleaving HDTV decoder