Traditional manufacturing processes for lightweight curved profiles are often associated with lengthy procedures,high costs,low efficiency,and high energy consumption.In order to solve this problem,a new staggered ext...Traditional manufacturing processes for lightweight curved profiles are often associated with lengthy procedures,high costs,low efficiency,and high energy consumption.In order to solve this problem,a new staggered extrusion(SE)process was used to form the curved profile of AZ31 magnesium alloy in this paper.The study investigates the mapping relationship between the curvature,microstructure,and mechanical properties of the formed profiles by using different eccentricities of the die.Scanning electron microscopy(SEM)and electron backscatter diffraction techniques are employed to examine the effects of different eccentricity values(e)on grain morphology,recrystallization mechanisms,texture,and Schmid factors of the products.The results demonstrate that the staggered extrusion method promotes the deep refinement of grain size in the extruded products,with an average grain size of only 15%of the original billet,reaching 12.28μm.The tensile strength and elongation of the curved profiles after extrusion under the eccentricity value of 10 mm,20 mm and 30 mm are significantly higher than those of the billet,with the tensile strength is increased to 250,270,235 MPa,and the engineering strain elongation increased to 10.5%,12.1%,15.9%.This indicates that staggered extrusion enables curvature control of the profiles while improving their strength.展开更多
本文针对H.264 Fidelity Range Extensions(FRExt,High Profile)解码过程中扩展的所有变换,采用二维矩阵分解和基于矩阵运算提取公共因子的操作,利用通用运算单元来设计高效的可重构VLSI结构.该结构不但节省面积(可重构变换结构只消耗了...本文针对H.264 Fidelity Range Extensions(FRExt,High Profile)解码过程中扩展的所有变换,采用二维矩阵分解和基于矩阵运算提取公共因子的操作,利用通用运算单元来设计高效的可重构VLSI结构.该结构不但节省面积(可重构变换结构只消耗了4807门电路),并且具有高性能(采用TSMC 0.13微米工艺,在150MHz的时钟频率下工作,该电路可以达到1.2G pixels/s的吞吐率,支持分辨率为4096×2048、每秒60帧的视频实时解码需求).根据DTUA(吞吐率和电路规模的比值)作为效率因子,本设计在支持H.264 High Profile所有变换的设计中具有最高的效率.展开更多
For radar high resolution range profile (HRRP) recognition, three aspects are of great importance to improve the performance, i.e. discrimination for outlier, classification for inner and an accurate description for f...For radar high resolution range profile (HRRP) recognition, three aspects are of great importance to improve the performance, i.e. discrimination for outlier, classification for inner and an accurate description for feature space. To tackle these issues, a novel target recognition method is designed, denoted by the multiple support vectors (multi-SV) method. With the proposed method, a special framework is constructed by a treble correlate support vector model to segment the feature space to two regions with the distribution of density, and then the description and classification hyperplane for each region are achieved. Based on the support vector framework, this method needs less memory and computation complexity to fit practical radar HRRP recognition. Finally, the experiment based on the measured data verifies the excellent performance of this method.展开更多
基金Project(JQ2022E004)supported by the Natural Science Foundation of Heilongjiang Province,China。
文摘Traditional manufacturing processes for lightweight curved profiles are often associated with lengthy procedures,high costs,low efficiency,and high energy consumption.In order to solve this problem,a new staggered extrusion(SE)process was used to form the curved profile of AZ31 magnesium alloy in this paper.The study investigates the mapping relationship between the curvature,microstructure,and mechanical properties of the formed profiles by using different eccentricities of the die.Scanning electron microscopy(SEM)and electron backscatter diffraction techniques are employed to examine the effects of different eccentricity values(e)on grain morphology,recrystallization mechanisms,texture,and Schmid factors of the products.The results demonstrate that the staggered extrusion method promotes the deep refinement of grain size in the extruded products,with an average grain size of only 15%of the original billet,reaching 12.28μm.The tensile strength and elongation of the curved profiles after extrusion under the eccentricity value of 10 mm,20 mm and 30 mm are significantly higher than those of the billet,with the tensile strength is increased to 250,270,235 MPa,and the engineering strain elongation increased to 10.5%,12.1%,15.9%.This indicates that staggered extrusion enables curvature control of the profiles while improving their strength.
文摘本文针对H.264 Fidelity Range Extensions(FRExt,High Profile)解码过程中扩展的所有变换,采用二维矩阵分解和基于矩阵运算提取公共因子的操作,利用通用运算单元来设计高效的可重构VLSI结构.该结构不但节省面积(可重构变换结构只消耗了4807门电路),并且具有高性能(采用TSMC 0.13微米工艺,在150MHz的时钟频率下工作,该电路可以达到1.2G pixels/s的吞吐率,支持分辨率为4096×2048、每秒60帧的视频实时解码需求).根据DTUA(吞吐率和电路规模的比值)作为效率因子,本设计在支持H.264 High Profile所有变换的设计中具有最高的效率.
文摘For radar high resolution range profile (HRRP) recognition, three aspects are of great importance to improve the performance, i.e. discrimination for outlier, classification for inner and an accurate description for feature space. To tackle these issues, a novel target recognition method is designed, denoted by the multiple support vectors (multi-SV) method. With the proposed method, a special framework is constructed by a treble correlate support vector model to segment the feature space to two regions with the distribution of density, and then the description and classification hyperplane for each region are achieved. Based on the support vector framework, this method needs less memory and computation complexity to fit practical radar HRRP recognition. Finally, the experiment based on the measured data verifies the excellent performance of this method.
