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IEEE Conference on Electron Devices and Solid-State Circuits

作者： Hua Yu Shibo Yang Wei Wang College of Optoelectronic Engineering Chongqing University Chongqing China Ministry of Education of China The Key Laboratory for Optoelectronic Technology & Systems Chongqing China National Key Laboratory of Fundamental Science of Micro/Nano-Device and System Technology Chongqing China

ISBN: (纸本)9781479923366

The paper proposes a complete energy harvesting solution integrated with a low-loss AC/DC rectifier and a high efficiency low dropout regulator (LDO) optimized for micro piezoelectric energy harvester. The AC/DC module converts AC into DC and then supplies power for the following LDO circuit module, through which the whole chip can obtain a stable 3.3V output voltage. A dynamic compensation mechanism is presented to improve the loop stability of LDO, which is easier to achieve high phase margin than traditional compensation strategy. The simulation results of LDO indicate that the typical dropout is 0.4mV with 1mA load current and 61mV with 150mA load current respectively, and the typical voltage line regulation error is 0.025%/V. In addition, the typical load regulation error was 0.00018%. The results demonstrate that the proposed chip meets the requirements of power supply for wireless sensor node (WSN).

关键词： Photonic band gap

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Patra: Parallel tree-reweighted message passing architecture

Patra: Parallel tree-reweighted message passing architecture

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International Conference on Field Programmable Logic and Applications

作者： Wenlai Zhao Haohuan Fu Guangwen Yang Wayne Luk Ministry of Education Key Laboratory for Earth System Modeling Tsinghua University Tsinghua National Laboratory for Information Science and Technology (TNList) Department of Computing Imperial College London

Maximum a posteriori probability inference algorithms for Markov Random Field are widely used in many applications, such as computer vision and machine learning. Sequential tree-reweighted message passing (TRW-S) is an inference algorithm which shows good quality in finding optimal solutions. However, the performance of TRW-S in software cannot meet the requirements of many real-time applications, due to the sequential scheme and the high memory, bandwidth and computational costs. This paper proposes Patra, a novel parallel tree-reweighted message passing architecture, which involves a fully pipelined design targeting FPGA technology. We build a hybrid CPU/FPGA system to test the performance of Patra for stereo matching. Experimental results show that Patra provides about 100 times faster than a software implementation of TRW-S, and 12 times faster than a GPU-based message passing algorithm. Compared with an existing design in four FPGAs, we can achieve 2 times speedup in a single FPGA. Moreover, Patra can work at video rate in many cases, such as a rate of 167 frame/sec for a standard stereo matching test case, which makes it promising for many real-time applications.

关键词： Field programmable gate arrays Message passing Algorithm design and analysis Bandwidth Random access memory Accuracy Vectors

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Algorithm for Directional Projection of Parametric Curves onto B-spline Surfaces

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Computer-Aided design and Applications 2014年第4期11卷 468-477页

作者： Song, Hai-Chuan Yong, Jun-Hai School of Software Tsinghua University Beijing 100084 China Department of Computer Science and Technology Tsinghua University Beijing 100084 China Key Laboratory for Information System Security Ministry of Education of China Beijing 100084 China Tsinghua National Laboratory for Information Science and Technology Beijing 100084 China

This paper proposes an algorithm for calculating the directional projection of parametric curves onto B-spline surfaces. It consists of a second order tracing method with which we construct a polyline to approximate the pre-image curve of the directional projection curve in the parametric domain of the base surface. The final 3D approximate curve is obtained by mapping the approximate polyline onto the base surface. The Hausdorff distance between the exact directional projection curve and the approximate curve is controlled less than the user-specified distance tolerance. And the continuity of the approximate curve is Ε{lunate}T-G1, where Ε{lunate}T is the user-specified angle tolerance. Experiments demonstrate that our algorithm is faster than the existing first order algorithm. © 2014 CAD Solutions, LLC.

关键词： Approximation algorithms

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Research on optimization of flight scheduling problem based on the combination of ant colony optimization and genetic algorithm

Research on optimization of flight scheduling problem based ...

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IEEE International Conference on Software Engineering and Service sciences (ICSESS)

作者： Wenkuai Liang Yi Li College of Computer Science Sichuan University Chengdu Sichuan China National Key Laboratory of Air Traffic Control Automation System Technology Chengdu Sichuan China

As the flight scheduling has always been a key technology which reduces flight delays and costs. Rational and efficient flight sorting method not only can effectively improve the utilization of the airport, reduce flight delay, but also ensure flight safety and reduce the incidence of sudden accidents. Firstly, we studied the application of ant colony algorithm in flight sorting, and proposed a new flight sorting method which is combined with ant colony algorithm and genetic algorithm depending on the mutation characteristic of genetic algorithm; Secondly, the minimization objective model that the flight total delay was minimum was established based on the sorting method; Finally, the simulation experiment was done based on the model. The simulation results show that the proposed method can effectively reduce flight delay. Comparing with ant colony algorithm, the global optimal flight sequence can be found in a shorter time.

关键词： Genetic algorithms Sorting Optimal scheduling Educational institutions Delays Algorithm design and analysis

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Research on flight scheduling of two runways based on the fusion of artificial fish school algorithm and genetic algorithm

Research on flight scheduling of two runways based on the fu...

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IEEE International Conference on Software Engineering and Service sciences (ICSESS)

作者： Jingjing Li Wenkuai Liang Yi Li College of Computer Science Sichuan University Chengdu Sichuan China System Technology National Key Laboratory of Air Traffic Control Automation Chengdu Sichuan China

The fusion of artificial fish algorithm and genetic algorithm is proposed to optimize the flight scheduling of two-runway in large airport in which the problems are difficult, inefficient and serious flight delays. First, in this paper, the shortcomings of artificial fish algorithm and genetic algorithm are analyzed, and combing the advantages of two algorithms, optimization algorithm is proposed based on the fusion of artificial fish swarm algorithm and genetic algorithm; Secondly, the objective function model of the total of time-consuming which is minimum about dual runway is established; Finally, the simulation results show that the fusion algorithm in operating efficiency, the reduction of flight delays and other aspects is better than first-come, first-served (FCFS), artificial fish algorithm and genetic algorithm, and can get better convergence results.

关键词： Marine animals Algorithm design and analysis Genetic algorithms Aircraft Scheduling Delays Heuristic algorithms

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Kinematics and Dynamics Analysis of a Quadruped Walking Robot with Parallel Leg Mechanism

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Chinese Journal of Mechanical Engineering 2013年第5期26卷 881-891页

作者： WANG Hongbo SANG Lingfeng HU Xing ZHANG Dianfan YU Hongnian Parallel Robot and Mechatronic System Laboratory of Hebei Province Yanshan University Key Laboratory of Advanced Forging & Stamping Technology and Science of Ministry of Education Yanshan University Xi’an University of Architecture and Technology Science and Technology Research Institute Yanshan University School of Design Engineering and ComputingBournemouth University

It is desired to require a walking robot for the elderly and the disabled to have large capacity,high stiffness,stability,***,the existing walking robots cannot achieve these requirements because of the weight-payload ratio and simple ***,Improvement of enhancing capacity and functions of the walking robot is an important research *** to walking requirements and combining modularization and reconfigurable ideas,a quadruped/biped reconfigurable walking robot with parallel leg mechanism is *** proposed robot can be used for both a biped and a quadruped walking *** kinematics and performance analysis of a 3-UPU parallel mechanism which is the basic leg mechanism of a quadruped walking robot are conducted and the structural parameters are *** results show that performance of the walking robot is optimal when the circumradius R,r of the upper and lower platform of leg mechanism are 161.7 mm,57.7 mm,*** on the optimal results,the kinematics and dynamics of the quadruped walking robot in the static walking mode are derived with the application of parallel mechanism and influence coefficient theory,and the optimal coordination distribution of the dynamic load for the quadruped walking robot with over-determinate inputs is analyzed,which solves dynamic load coupling caused by the branches’ constraint of the robot in the walk *** laying a theoretical foundation for development of the prototype,the kinematics and dynamics studies on the quadruped walking robot also boost the theoretical research of the quadruped walking and the practical applications of parallel mechanism.

关键词： walking robot parallel leg mechanism kinematics dynamics over-determinate inputs

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A highly-efficient and green data flow engine for solving euler atmospheric equations

A highly-efficient and green data flow engine for solving eu...

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International Conference on Field Programmable Logic and Applications

作者： Lin Gan Haohuan Fu Chao Yang Wayne Luk Wei Xue Oskar Mencer Xiaomeng Huang Guangwen Yang Department-of Computer-Science and Technology Tsinghua University Tsinghua National Laboratory for Information Science and Technology (TNList) Ministrv of Education Key Laboratory for Earth System Modeling Tsinghua University Institute of Software Chinese Academy of Sciences Department of Computing Imperial College London Mexeler Technologies

Atmospheric modeling is an essential issue in the study of climate change. However, due to the complicated algorithmic and communication models, scientists and researchers are facing tough challenges in finding efficient solutions to solve the atmospheric equations. In this paper, we accelerate a solver for the three-dimensional Euler atmospheric equations through reconfigurable data flow engines. We first propose a hybrid design that achieves efficient resource allocation and data reuse. Furthermore, through algorithmic offsetting, fast memory table, and customizable-precision arithmetic, we map a complex Euler kernel into a single FPGA chip, which can perform 956 floating point operations per cycle. In a 1U-chassis, our CPU-DFE unit with 8 FPGA chips is 18.5 times faster and 8.3 times more power efficient than a multicore system based on two 12-core Intel E5-2697 (Ivy Bridge) CPUs, and is 6.2 times faster and 5.2 times more power efficient than a hybrid unit equipped with two 12-core Intel E5-2697 (Ivy Bridge) CPUs and three Intel Xeon Phi 5120d (MIC) cards.

关键词： Mathematical model Atmospheric modeling Equations Field programmable gate arrays Computational modeling Kernel Three-dimensional displays

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Energy-Efficient Antenna Selection and Power Allocation for Large-Scale Multiple Antenna systems with Hybrid Energy Supply

Energy-Efficient Antenna Selection and Power Allocation for ...

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IEEE Global Communications Conference

作者： Zhenyu Zhou Sheng Zhou Jie Gong Zhisheng Niu State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources School of Electrical and Electronic Engineering North China Electric Power University Tsinghua National Laboratory for Information Science and Technology Department of Electronic Engineering Tsinghua University

ISBN: (纸本)9781479935130

The combination of energy harvesting and large-scale multiple antenna technologies provides a promising solution for improving the energy efficiency (EE) by exploiting renewable energy sources and reducing the transmission power per user and per antenna. However, the introduction of energy harvesting capabilities into large-scale multiple antenna systems poses many new challenges for energy-efficient system design due to the intermittent characteristics of renewable energy sources and limited battery capacity. Furthermore, the total manufacture cost and the sum power of a large number of radio frequency (RF) chains can not be ignored, and it would be impractical to use all the antennas for transmission. In this paper, we propose an energy-efficient antenna selection and power allocation algorithm to maximize the EE subject to the constraint of user's quality of service (QoS). An iterative offline optimization algorithm is proposed to solve the non-convex EE optimization problem by exploiting the properties of nonlinear fractional programming. The relationships among maximum EE, selected antenna number, battery capacity, and EE-SE tradeoff are analyzed and verified through computer simulations.

关键词： Radio frequency Batteries Resource management Transmitting antennas Optimization Renewable energy sources

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The fabrication of vibration energy harvester arrays based on AlN piezoelectric film

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Journal of Semiconductors 2013年第11期34卷 79-82页

作者：尚正国李东玲温志渝赵兴强 Key Laboratory of Fundamental Science on Micro/Nano-Device and System Technology Chongqing University National Center for International Research of Micro/Nano-System and New Material Technology Chongqing University Microsystem Research Center of Chongqing University

： The fabrication and measurement results of the vibration energy harvester arrays based on the piezoelectric aluminum nitride （AlN） film are presented. The structure design and fabrication process of the device are introduced. The key material, the AIN film with crystal orientation （002）, was deposited by pulsed-DC magnetron sputtering and characterized by X-ray diffraction （XRD）. The resonant frequency, power out, and the open circuit voltage of the device are detected. The optimized load of 80 kΩ and a remarkable maximum power out of 30.4 μW are obtained when the acceleration of 0.9g （g is standard gravity acceleration） is applied. key words： A1N; crystal orientation; harvester arrays; vibration energy

关键词： AlN crystal orientation harvester arrays vibration energy

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Research on trans critical characteristic on sliding pressure booting process of SCWR

Research on trans critical characteristic on sliding pressur...

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2013 21st International Conference on Nuclear Engineering, ICONE 2013

作者： Liu, Liang Zhou, Tao Song, Mingqiang Chen, Juan Luo, Feng Xia, Bangyang North China Electric Power University Beijing China Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China Chengdu China

ISBN: (纸本)9780791855836

The homogeneous flow model of trans critical transient calculation is achieved by the trans critical program of SCWR which is made by FORTRAN. The SCWR sliding pressure starting scheme is simulated by this program. So that the pressure raising stage characteristic of its booting process is analyzed. The calculation result shows that, in the pressure raising stage of booting process, the maximum cladding temperature gradually increases. Coolant temperature increases gradually along with the flow direction. The dry degree also increases along with the flow direction. The highest temperature of cladding does not exceed 650 °C limits. There is no major adverse effect on heat transfer of fuel rod in the dramatic changes in the physical properties of water. Copyright © 2013 by ASME.

关键词： Heat transfer

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