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2006 MRS Spring Meeting

作者： Jie, Feng Yin, Zhang Baowei, Qiao Yanfei, Cai Yinyin, Lin Tingao, Tang Bingchu, Cai Bomy, Chen Key Lab. for Thin Film and Microfabrication Shanghai Jiao Tong University Ministry of Education 1954 Huasan Road Shanghai 200030 China State Key Laboratory of ASIC System Fudan University Shanghai 200433 China Silicon Storage Technology Inc. 1171 Sonora Court Sunnyvale CA 94086

The novel phase change materials Si-Sb-Te films were prepared. The crystallization temperature of films increases with the increasing of Si concentration. Phase separation was observed in the Si-Sb-Te films, the dominant phase is Sb2Te3. The melting temperature of Si-Sb-Te decreased to ∼550°C lower than 640°C of Ge2Sb 2Te5. The decrease of film thickness of Si-Sb-Te films is less than 2% after annealing at 400°C, which is less than ∼7% of the film thickness change of Ge2Sb2Te5 film. The crystalline resistivity of Si-Sb-Te films increased and the ratio of amorphous/crystalline resistivity of Si-Sb-Te films increased also comparing with Ge2Sb2Te5 film, which is benefit to reduce the writing current and keep higher on/off ratio of phase change memory. Reversible switching was performed in the devices with Si-Sb-Te films. The device with Si14.3Sb28.6Te57.2 film can be programmed with a 100 ns SET pulse and a 20 ns RESET pulse. The Reset current is only 1.37mA for a 10μm-sized device. © 2006 Materials Research Society.

关键词： Thin films

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Electromagnetic Design of Multi-Disc Coreless Axial Magnetic Flux Permanent Magnet Motor

Electromagnetic Design of Multi-Disc Coreless Axial Magnetic...

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2020 IEEE International Conference on Applied Superconductivity and Electromagnetic Devices, ASEMD 2020

作者： Wang, Xiaoguang Zhao, Meng Wan, Ziwei Xu, Wei Hubei Key Lab. for High-efficiency Utiliz. of Solar Ener. and Oper. Control of Energy Storage System Hubei University of Technology Wuhan430068 China School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan430068 China

ISBN: (纸本)9781728152158

In this paper, a multi-disc coreless axial magnetic flux permanent magnet (AFPM) motor is presented. This motor takes the advantage of single-phase winding and H-bridge drive topology, which improve the fault-tolerant performance of the motor and greatly simplify the winding process. According to the performance requirement of the motor, the size, permanent magnet (PM) structure, yoke structure and the winding are designed. The model of the motor is built by the three-dimensional finite element analysis (FEA) method. The air gap magnetic flux density, back EMF and the torque of the motor are investigated. Also, the stress of the motor is studied to verify the reliability of the motor. © 2020 IEEE.

关键词： Bridge circuits

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Performance of an Axial Flux Hybrid Excitation Motor with SMC for HEVs

Performance of an Axial Flux Hybrid Excitation Motor with SM...

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2020 IEEE International Conference on Applied Superconductivity and Electromagnetic Devices, ASEMD 2020

作者： Wang, Xiaoguang Wan, Ziwei Zhao, Meng Xu, Wei Hubei Key Lab. for High-efficiency Utiliz. of Solar Ener. and Oper. Control of Energy Storage System Hubei University of Technology Wuhan430068 China School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan430068 China

ISBN: (纸本)9781728152158

Axial flux permanent magnet (AFPM) motors are used as drive motors for hybrid vehicles due to their high torque/power density and high efficiency. This technology makes the use of soft magnetic composites (SMC) attractive for both manufacturing and performance. SMC has the characteristics of low eddy current loss, convenient processing, low magnetic permeability, low mechanical strength. An additional dc magnetic field excitation coil is added to the motor to overcome the shortcomings of the low torque density of the SMC, which ensures the high performance of the motor. The performance of axial flux hybrid excitation motor (AFHEM) is evaluated based on finite element analysis (FEA) method. The analysis results show that the proposed motor is able to achieve high torque density and wide speed range, which are suitable for hybrid electric vehicles. © 2020 IEEE.

关键词： Hybrid vehicles

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Metadata management of models for resources and environment based on Web 2.0 technology

Metadata management of models for resources and environment ...

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2013 International Conference on Geo-Informatics in Resource Management and Sustainable Ecosystem, GRMSE 2013

作者： Lu, YiMin Sheng, Ling Wu, Sheng Yue, TianXiang Key Laboratory of Data Mining and Information Sharing of Ministry of Education Spatial Information Research Center of Fujian Province Fuzhou University Fuzhou 350002 China State Key Lab. of Resources and Environmental Information System Institute of Geographic Sciences and Nature Resources Research CAS Beijing 100101 China

ISBN: (纸本)9783642419072

The papers firstly introduce the standard framework of model metadata as well as its composition, content and meaning. It is held that model metadata should consist of an identifier, sphere of application, model parameters, principles, performances, run conditions, management information, references, and case information. Then we explained the virtual community for model metadata publishing, sharing and maintaining. Finally, we expatiated on the expression of model metadata standard based on XML schema Definition (XSD), the extended-metadata based on Tag and the publishing of model metadata based on Wiki. Based on Web 2.0 technology, the traditional model metadata which just create by modeler was extended to support extended-metadata created by model users or domain experts, which includes the feedback on model evaluation and suggestion. The user-metadata was refined from massive messy individual tags, which reflect the implicit knowledge of models. © Springer-Verlag Berlin Heidelberg 2013.

关键词： Metadata

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Single-step model predictive control of VSC converter station supplying power to passive network 4

Single-step model predictive control of VSC converter statio...

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4th International Conference on Advanced Electronic Materials, Computers and Software Engineering, AEMCSE 2021

作者： Shuang, Lv Yu, Yu Wenkang, Yang Lichao, Xu Hubei University of Technology Hubei Key Lab. for High-Efficiency Utiliz. of Solar Ener. and Oper. Control of Energy Storage System China State Grid Hubei Electric Power Co.Ltd. Wuhan Electric Power Supply Company Wuhan430068 China

ISBN: (纸本)9781665415965

The AC power quality of the VSC converter station that supplies power to the passive network is in most cases affected by the PI control parameters. In this paper, the model predictive control algorithm without the need to modulate the PI parameters is applied to the VSC converter station control. Firstly, the discrete mathematical model of VSC inverter in αβ coordinate is derived, and the one-step prediction model of AC control voltage is established. Then, the corresponding cost function is constructed to obtain the next time optimal switching state to act on the inverter with the minimum cost function. Finally, a VSC inverter model that supplies power to the passive network is established in MATlab. and a single-step model predictive control strategy is used to do simulation studies on the conditions of linear load, sudden load change, AC voltage reference value change, and model parameter deviation. The results show that the single-step model predictive control method adopted in this paper improves the power quality and the robustness of the control system. © 2021 IEEE.

关键词： Passive networks

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Image Registration of Infrared and Visible Image Based on Geometric Constraint

Image Registration of Infrared and Visible Image Based on Ge...

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2019 International Conference on Modeling, Simulation, Optimization and Algorithm, ICMSOA 2019

作者： Wang, Juan Cheng, Kaiwen Ke, Cong Liu, Min Cai, Linkang Shi, Hao Hubei Key Lab. for High-Efficiency Utiliz. of Solar Ener. and Oper. Control of Energy Storage System Hubei University of Technology Wuhan430068 China Post-doctoral Research Workstation Wuhan Huaan Science and Technology Co. Ltd. Wuhan430068 China

With the wide application of infrared sensors and visible sensors, the registration of two heterogeneous images has caused widespread concern. Multi-angle comprehensive analysis of multi-sensor imaging systems can obtain more accurate image information. However, the main challenge of image registration is the detection of feature points and the acquisition of the correct feature point matching pairs. A Geometric constraint method is proposed to obtain the correct feature matching pairs. Three feature point matching pairs are randomly selected in the two images, and the ratio of the corresponding line segment lengths is obtained according to the coordinates of the three feature points to find the most three similar feature point matching pairs. Compared with the RANSAC algorithm, the method can obtain the correct feature point matching pair better. The algorithm runs on the DSP platform for about 30s, the error is 1 pixel, and the correct rate reaches 80%. © 2019 IOP Publishing Ltd.

关键词： Image registration

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Some solutions for writing current reduction and high density application of phase change memory

Some solutions for writing current reduction and high densit...

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ICSICT-2006: 2006 8th International Conference on Solid-State and Integrated Circuit Technology

作者： Lin, Yinyin Feng, Jie Cai, Yaifei Lv, Hangbing Liao, Feifei Liu, Xin Tang, Tingao Qiao, Baowei Lai, Yunfeng Zhang, Yi Cai, Bingchu Chen, Bomy Department of Microelectronics ASIC and System State Key Lab. Fudan University Shanghai 200433 China Research Institute of Micro/Nanometer Technology Shanghai Jiao Tong University Shanghai 200030 China Silicon Storage Technology Inc. 1171 Sonora Court Sunnyvale CA 94086 United States

High writing current is the bottle-neck of PCM application and efforts focus on merely materials doping to improve crystal resistivity, novel structure to decrease active area etc. Here some solutions of our group are... 详细信息

ISBN: (纸本)1424401615

关键词： Phase change memory

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HPDedup: A Hybrid prioritized data deduplication mechanism for primary storage in the cloud 33

HPDedup: A Hybrid prioritized data deduplication mechanism f...

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33rd International Conference on Massive storage systems and Technology, MSST 2017

作者： Wu, Huijun Wang, Chen Fu, Yinjin Sakr, Sherif Zhu, Liming Lux, Kai Data CSIRO University of New South Wales Australia PLA University of Science and Technology China Science and Technology on Parallel and Distributed Laboratory State Key Laboratory of High Performance Computing State Key Lab. of High-end Server and Storage Technology Coll. of Computer Natl. Univ. of Def. Technol. China

Eliminating duplicate data in primary storage of clouds increases the cost-efficiency of cloud service providers as well as reduces the cost of users for using cloud services. Most existing primary deduplication techniques either use inline caching to exploit locality in primary workloads or use postprocessing deduplication running in system idle time to avoid the negative impact on I/O performance. However, neither of them works well in the cloud servers running multiple services or applications for the following two reasons: Firstly, the temporal locality of duplicate data writes may not exist in some primary storage workloads thus inline caching often fails to achieve good deduplication ratio. Secondly, the post-processing deduplication allows duplicate data to be written to disks, therefore does not provide the benefit of I/O deduplication and requires high peak storage capacity. This paper presents HPDedup, a Hybrid Prioritized data Deduplication mechanism to deal with the storage system shared by applications running in co-located virtual machines or containers by fusing an inline and a post-processing process for exact deduplication. In the inline deduplication phase, HPDedup gives a fingerprint caching mechanism that estimates the temporal locality of duplicates in data streams from different VMs or applications and prioritizes the cache allocation for these streams based on the estimation. HPDedup also allows different deduplication threshold for streams based on their spatial locality to reduce the disk fragmentation. The post-processing phase removes duplicates whose fingerprints are not able to be cached due to weak temporal locality from disks. The hybrid deduplication mechanism significantly reduces the amount of redundant data written to the storage system while maintaining inline data writing performance. Our experimental results show that HPDedup clearly outperforms the state-of-the-art primary storage deduplication techniques in terms of inline cac

关键词： Efficiency

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Vehicle detection based on shadow feature and weighted-voting

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Journal of Computational Information systems 2015年第18期11卷 6517-6527页

作者： Zhou, Shijie Xu, Xianghua Jiang, Xingwen Chen, Zongmao School of Computer Science and Technology Hangzhou China Zhejiang Provincial Key Lab. of Data Storage and Transmission Technology Hangzhou China School of Science Hangzhou Dianzi University Hangzhou China

This paper presents a real-time vehicle detection approach with lower missed detection rate. We extract shadow feature and generate hypothesis by a new algorithm based on shadow line fusion, then refining the result set and removing false detection by frame reducing image. Then a weighted-voting policy on multi vehicle feature is used to verify hypothesis, so that we can enhance the detection ratio of irregularly shaped vehicle further. The experiment results show that the proposed algorithms can achieve higher detection rate compared with previous methods. © 2015 by Binary Information Press.

关键词： Feature extraction

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Effect of O2on Partial Discharge Characteristic of C5F10O/CO2Gas Mixture

Effect of O2on Partial Discharge Characteristic of C5F10O/CO...

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2021 International Conference on Advanced Electrical Equipment and Reliable Operation, AEERO 2021

作者： Xia, Yalong Liu, Fan Wei, Zhuo Zhang, Xiaoxing Han, Pu Xiao, Song Li, Zhen Li, Yi Li, Yalong Research Institute State Grid Sichuan Electric Power Cheng Du China Wuhan University School of Electrical Engineering and Automation Wuhan China Hubei University of Technology Hubei Key Lab. for High-efficiency Utiliz. of Solar Ener. and Oper. Control of Energy Storage System Wuhan China

ISBN: (纸本)9781665402644

C5F10O, as a new eco-friendly gas insulating medium with great application potential, has attracted much attention from researchers. There are few studies on the partial discharge (PD) characteristics of C5F10O/CO2O2 gas mixture at present. In this paper, we used needle-plate electrodes to simulate the extremely inhomogeneous electric field caused by the defects of metal protrusions in electrical equipment and tested the partial discharge initial voltage (PDIV) of C5F10O/CO2O2 gas mixture. The effect of oxygen on the partial discharge characteristics of C5F10O gas mixture was revealed. We found that C5F10O gas mixture has an obvious polarity effect, and PDIV+ is always larger than PDIV-. The addition of oxygen reduces the PDIV- and PDIV+ of C5F10O gas mixture and the reduction effect on PDIV+ is more obvious. Therefore, the degrading effect of O2 on the partial discharge characteristics of C5F10O gas mixture should be considered and the proportion of oxygen in C5F10O gas mixture should be strictly controlled. © 2021 IEEE.

关键词： Partial discharges

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