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Parallel lightpath provisioning under wavelength continuity constraint in multi-domain optical networks based on hierarchical path computation element

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Science China(Information Sciences) 2013年第3期56卷 160-168页

作者： SUN Jian wang zongwei CHEN Zhen PENG YunFeng School of Communication and Information Engineering University of Electronic Science and Technology of China School of Computer and Communication Engineering University of Science and Technology Beijing

Inter-domain path provision under a wavelength continuity constraint(WCC),including path computation and resource reservation procedures,is a major challenge in multi-domain wavelength division multiplexing(WDM) optical networks,because of the requirement for confidentiality between the *** on the hierarchical path computation element(PCE) architecture,this work proposed a path establishment scheme under a WCC to provide a fast inter-domain path establishment solution and decrease the influence of the *** hierarchical PCE architecture consists of a single parent PCE serving as the arbitrator and multiple child PCEs responsible for the child *** cooperation between the parent PCE and the child PCEs,both inter-domain path computation and inter-domain wavelength reservation can be processed in parallel to accelerate and optimize WCC lightpath provisioning and thus to reduce the blocking *** effectiveness of this solution has been evaluated through *** simulation results show that the proposed solution can achieve lower computation and reservation delays and thus lead to lower blocking probabilities on the multi-domain WCC paths.

关键词： multi-domain optical networks path computation resource reservation WCC hierarchical PCE

THEORETICAL ANALYSIS AND EXPERIMENTAL STUDY OF CARBON NANOTUBE PROBE AND CONVENTIONAL ATOMIC FORCE MICROSCOPY PROBE ON SURFACE ROUGHNESS

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Chinese Journal of Mechanical Engineering 2008年第5期21卷 62-64页

作者： wang Jinghe wang Hongxiang XU zongwei DONG Shen wang Shiqian ZHANG Huali Center for Precision Engineering Harbin Institute of Technology Harbin 150001. China

In this paper, three different tips are employed, i.e., the carbon nanotube tip, monocrystalline silicon tip and silicon nitride tip. Resorting to atomic force microscope （AFM）, they are used for measuring the surface roughness of indium tin oxide （ITO） film and the immunoglobulin G （IgG） proteins within the scanning area of 10 μm×10 μm and 0.5 μm×0.5 μm, respectively. Subsequently, the scanned surface of the ITO film and IgG proteins are analyzed by using fractal dimension. The results show that the ffactal dimension measured by carbon nanotube tip is biggest with the highest frequency components and the most microscopic information. Therefore, the carbon nanotube tip is the ideal measuring tool for measuring super-smooth surface, which will play a more and more important role in the high-resolution imaging field.

关键词： Atomic force microscope Carbon nanotube probes Fractal dimension

An isolated symmetrical 2T2R cell enabling high precision and high density for RRAM-based in-memory computing

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Science China(Information Sciences) 2024年第5期67卷 287-294页

作者： Yaotian LING zongwei wang Yuhang YANG Lin BAO Shengyu BAO Qishen wang Yimao CAI Ru HUANG School of Integrated Circuits Beijing Advanced Innovation Center for Integrated Circuits Peking University State Key Laboratory of Information Photonics and Optical Communications Beijing University of Posts and Telecommunications

In-memory computing(IMC), leveraging emerging memories, holds significant promise in overcoming memory limitations and improving energy efficiency. However, the prevailing IMC array structure based on serially connected transistors and memory cells(1T1R/2T2R), along with the signed weight mapping scheme, can lead to asymmetrical weight sensing issues(AWS) due to electrical asymmetry within the1T1R/2T2R structure, particularly in highly scaled cells where the transistor's resistance becomes significant. In this paper, we propose and fabricate an electrically symmetric memory cell based on a physically isolated 2T2R structure for IMC. This design aims to enhance the precision and density of RRAM-based IMC arrays. The 2T2R cells are manufactured using the back-end-of-line(BEOL) process of a commercial40 nm technology platform. The feasibility of this design is verified through measured and simulated results,showcasing its capability to address the issue of AWS. Compared to conventional 2T2R cells, this design achieves a considerably smaller transistor footprint without compromising accuracy, while also improving integration density by 42.2%. These innovative memory cell advancements have the potential to further advance high-energy-efficient IMC technology.

关键词： RRAM 2T2R multi-level storage weight asymmetry in-memory computing

Numerical analysis on combustion characteristics of hybrid rocket motor with star-tube segmented grain

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Chinese Journal of Aeronautics 2023年第12期36卷 102-112页

作者： Chengen LI zongwei wang Jin YANG Jinpeng JIANG Fan GONG Zhu LIU Yu SUN Science and Technology on Space Physics Laboratory Beijing 100076China

A method of star-tube combined segmented grain is proposed to improve the combustion performance of hybrid rocket *** star-tube combined segmented grain consists of a single-port star part and a single-port tube part.A mid-chamber forms between the fore-grain and the aft-grain for better mixing *** single-port feature gives hybrid rocket motor several advantages,such as simple structure,high reliability,and variable *** paper is mainly aimed at studying the combustion characteristics of hybrid rocket motor with star-tube segmented grain through three-dimensional steady *** performance of the motors with different segmented grain combinations,including fore-tube/aft-tube,fore-tube/aftstar,fore-star/aft-star and fore-star/aft-tube,is contrastively *** motor in this paper adopts polyethylene and 90%hydrogen peroxide as the *** reveal that segmented grain with different-type grain combinations could greatly change the flow field in the second half of the combustion *** of the flow field is beneficial to the mixing between the fuel and the oxidizer,and it could increase the fuel regression rate and the combustion *** turbulence effect of tube aft-grain is better than that of star *** the four segmented grain combinations,the combination of star fore-grain and tube aft-grain is the preferred method with optimal overall *** grain configuration could increase the regression rate of tube aft-grain to surpass that of star aft-grain in other ***,hybrid rocket motor with this grain configuration achieves the highest combustion efficiency.

关键词： Combustion performance Flow fields Fluid-solid coulping Hybrid rocket motor Star-tube segmented grain

Integration of biocompatible organic resistive memory and photoresistor for wearable image sensing application

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Science China(Information Sciences) 2018年第6期61卷 32-39页

作者： Qingyu CHEN Min LIN Yichen FANG zongwei wang Yuchao YANG Jintong XU Yimao CAI Ru HUANG Institute of Microelectronics Peking University Research Center of Flexible Electronics Peking University Key Laboratory of Infrared Imaging Materials and Detectors Shanghai Institute of Technical PhysicsChinese Academy of Sciences

The integration of multiple functional devices to achieve complex functions has become an essential requirement for future wearable biomedical electronic devices and systems. In this paper, we present a flexible multi-functional device composed of a biocompatible organic polymer resistive random-access memory(RRAM) and a photoresistor for wearable image sensing application. The resistive layer of organic polymer RRAM is composed by polychloro-para-xylylene(parylene-C), which is a flexible, transparent, biocompatibility and chemical stability polymer material. What is more, parylene-C is quite safe to be used within human body as it is a Food and Drug Administration(FDA)-approved material. This organic RRAM shows stable switching characteristics, low operation voltages(3.25 V for set voltage and-0.55 V for reset voltage), low static power consumption, high storage window and good retention properties(>104s).A multi-functional device that can detect the light intensity of incident light and simultaneously store the information in the memory devices for wearable image sensing application was proposed and fabricated by integrating the organic resistive memory and a photoresistor. The threshold of incident light intensity can be easily adjust by changing the external voltage. This device is promising for building wearable electronic systems with various multiple functionalities.

关键词： wearable device image sensor flexible biocompatible resistive random-access memory(RRAM) photoresistor

Investigation and mitigation of Mott neuronal oscillation fluctuation in spiking neural network

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Science China(Information Sciences) 2024年第2期67卷 291-301页

作者： Lindong WU zongwei wang Lin BAO Linbo SHAN Zhizhen YU Yunfan YANG Shuangjie ZHANG Guandong BAI Cuimei wang John ROBERTSON Yuan wang Yimao CAI Ru HUANG School of Integrated Circuits Peking University Beijing Advanced Innovation Center for Integrated Circuits State Key Laboratory of Information Photonics and Optical Communications Beijing University of Posts and Telecommunications Department of Engineering University of Cambridge

Mott devices, featuring low hardware cost and high energy efficiency, have been demonstrated as a key oscillatory element in artificial neurons to enable spiking neural networks(SNNs) such as conversionbased SNNs(CSNNs). However, there will be inevitably non-ideal fluctuation in the oscillation behavior,causing the accuracy degradation of networks. In this paper, we investigate the Mott neuronal oscillation fluctuation(NOF) through experiments and modeling. The results show that the NOF phenomenon conforms to Gaussian distribution and originates from thermal fluctuation induced switching voltage variations. We construct a two-layer CSNN for image recognition tasks to study the NOF effect and propose the activation function boundary(AFB) method to strengthen the stability of the network. The results indicate that AFB can improve the accuracy of CSNN by up to 15.5% by tightening output distribution.

关键词： Mott neuron oscillation fluctuation variation-aware Mott neuronal model conversion-based spiking neural network activation function boundary

Investigation of Nb Ox-based volatile switching device with self-rectifying characteristics

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Science China(Information Sciences) 2019年第12期62卷 277-280页

作者： Yichen FANG zongwei wang Caidie CHENG Zhizhen YU Teng ZHANG Yuchao YANG Yimao CAI Ru HUANG Key Laboratory of Microelectronic Devices and Circuits (MOE) Institute of MicroelectronicsPeking University

Dear editor,Resistive random access memory (RRAM), one of the most promising emerging non-volatile memory technologies, has been extensively investigated by researchers from both academia and industry due to its fast ... 详细信息

关键词： Investigation of Nb Ox-based volatile switching device with self-rectifying characteristics

Memory materials and devices:From concept to application

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InfoMat 2020年第2期2卷 261-290页

作者： Zhenhan Zhang zongwei wang Tuo Shi Chong Bi Feng Rao Yimao Cai Qi Liu Huaqiang Wu Peng Zhou State Key Laboratory of ASIC and System School of MicroelectronicsFudan UniversityShanghaiChina Key Laboratory of Microelectronic Devices and Circuits(MOE) Institute of MicroelectronicsPeking UniversityBeijingChina Key Laboratory of Microelectronic Devices and Integrated Technology Institute of MicroelectronicsChinese Academy of SciencesBeijingChina College of Materials Science and Engineering Shenzhen UniversityShenzhenChina Institute of Microelectronics Tsinghua UniversityBeijingChina

Memory cells have always been an important element of information *** emerging technologies like big data and cloud computing,the scale and complexity of data storage has reached an unprecedented peak with a much higher requirement for memory *** is well known,better data storage is mostly achieved by ***,as the size of the memory device is reduced,a series of problems,such as drain gate-induced leakage,greatly hinder the performance of memory *** meet the increasing demands of information technology,novel and high-performance memory is urgently ***,emerging memory technologies are expected to improve memory performance and drive the information *** review will focus on the progress of several emerging memory technologies,including two-dimensional material-based memories,resistance random access memory(RRAM),magnetic random access memory(MRAM),and phasechange random access memory(PCRAM).Advantages,mechanisms,and applications of these diverse memory technologies will be discussed in this review.

关键词： memory MRAM PCRAM RRAM two-dimensional material

Recent progress in ICF target fabrication at RCLF

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Matter and Radiation at Extremes 2018年第3期3卷 135-144页

作者： Kai Du Meifang Liu Tao wang Xiaoshan He zongwei wang Juan Zhang Research Center of Laser Fusion CAEPP.O.Box 919-987MianyangSichuan 621900China

Target is one of the essential parts in inertial confinement fusion(ICF)*** ensure the symmetry and hydrodynamic stability in the implosion,there are stringent specifications for the *** by the need to fabricate the target required by ICF experiments,a series of target fabrication techniques,including capsule fabrication techniques and the techniques of target characterization and assembly,are developed by the Research Center of Laser Fusion(RCLF),China Academy of Engineering Physics(CAEP).The capsule fabrication techniques for preparing polymer shells,glow discharge polymer(GDP)shells and hollow glass micro-sphere(HGM)are studied,and the techniques of target characterization and assembly are also investigated in this *** research about the target fabrication is also done to improve the quality of the *** on the development of target fabrication techniques,some kinds of target have been prepared and applied in the ICF experiments.

关键词： Capsule fabrication Target characterization and assembly Microencapsulation technique Depolymerizable mandrel technique White-light interferometry