The reconfigurable chip,which integrates the advantages of high performance,high flexibility,high parallelism,low power consumption,and low cost,has achieved rapid development and wide application.Generally,the contro...The reconfigurable chip,which integrates the advantages of high performance,high flexibility,high parallelism,low power consumption,and low cost,has achieved rapid development and wide application.Generally,the control part and the computing part of algorithm is accelerated based on different reconfigurable architectures,but it is difficult to obtain overall performance improvement.For improving efficiency of reconfigurable structure both for the control part and the computing part,a hybrid of instruction-driven and data-driven self-reconfigurable cell array is proposed.On instruction-driven mode,processing element(PE)works like a reduced instruction set computer(RSIC)machine,which is mainly for the control part of algorithm.On data-driven mode,data is calculated by flowing between the preconfigured PEs,which is mainly for the computing of algorithm.For verifying the efficiency of architecture,some high-efficiency video coding(HEVC)video compression algorithms are implemented on the proposed architecture.The proposed architecture has been implemented on Xilinx FPGA Virtex UltraScale VU440 develop board.The same circuitry is able to run at75 MHz.Compared with the architecture that only supports instruction-driven,the proposed architecture has better calculation efficiency.展开更多
目的:观察中医穴位按摩对腹部手术患者术后胃肠功能恢复的影响。方法:将80例需行腹部手术的患者随机分为观察组与对照组各40例。对照组术后予以常规照护模式,观察组在对照组基础上自术后6 h起加以穴位按摩,直至肛门首次排气为止。比较2...目的:观察中医穴位按摩对腹部手术患者术后胃肠功能恢复的影响。方法:将80例需行腹部手术的患者随机分为观察组与对照组各40例。对照组术后予以常规照护模式,观察组在对照组基础上自术后6 h起加以穴位按摩,直至肛门首次排气为止。比较2组手术前后胃肠激素水平、术后肠鸣音恢复时间、首次肛门排气时间、首次排便时间、腹胀发生率、腹胀缓解时间、恢复正常饮食时间、住院天数及术后视觉模拟评分法(VAS)评分。结果:与同组术前比较,2组术后胃动素(MTL)、P物质(SP)水平均升高(P<0.05),生长抑素(SS)水平均降低(P<0.05);与对照组术后比较,观察组术后MTL、SP水平均较高(P<0.05),SS水平较低(P<0.05)。观察组术后肠鸣音恢复时间、首次肛门排气时间及排便时间、腹胀缓解时间、恢复正常饮食时间及住院天数均明显短于对照组(P<0.05),腹胀发生率低于对照组(P<0.05)。2组术后6 h VAS评分比较,差异无统计学意义(P>0.05),观察组术后12 h、24 h、48 h VAS评分均低于对照组(P<0.05)。结论:穴位按摩可有效改善腹部手术患者术后胃肠道功能,减轻疼痛不适感,促进康复。展开更多
Based on the flexible quadtree partition structure of coding tree units(CTUs),the deblocking filter(DBF)in high efficiency video coding(HEVC)consumes a lot of resources when implemen-ted by hardware.It is difficult to...Based on the flexible quadtree partition structure of coding tree units(CTUs),the deblocking filter(DBF)in high efficiency video coding(HEVC)consumes a lot of resources when implemen-ted by hardware.It is difficult to achieve flexible switching between different sizes of coding blocks.Aiming at this problem,a reconfigurable implementation of DBF is proposed.Based on the dynamic programmable reconfigurable video array processor(DPRAP)with context switch reconfiguration mechanism,the runtime flexible switching of two coding block sizes is realized.The experimental results show that the highest work-frequency reaches 151.4 MHz.Compared with the dedicated hardware architecture scheme,the resource consumption can be reduced by 28.1%while realizing the dynamic switching between algorithms of two coding block sizes.Compared with the results of HM16.0,by using a complete I-frame for testing,the average peak signal-to-noise ratio(PSNR)of the reconfigurable implementation proposed in this paper has increased by 3.0508 dB,the coding quality has improved to a certain extent.展开更多
波达方向(direction of arrival,DOA)估计是利用具有一定空间结构的天线阵元对空间信源的来波方向进行估计。为解决MUSIC算法和ESPRIT算法在智能天线DOA估计中空间谱分辨率和抗噪声性能方面的不足,依据压缩感知理论的贪婪算法思想,将匹...波达方向(direction of arrival,DOA)估计是利用具有一定空间结构的天线阵元对空间信源的来波方向进行估计。为解决MUSIC算法和ESPRIT算法在智能天线DOA估计中空间谱分辨率和抗噪声性能方面的不足,依据压缩感知理论的贪婪算法思想,将匹配追踪(matching pursuit,MP)算法和子空间追踪(subspace pursuit,SP)算法应用在DOA估计中,即提出2种新的算法MP-DOA和SP-DOA。这2种算法主要包括原子库建立、信号投影、最佳匹配原子筛选及信号特征提取等过程。4种算法的仿真实验与对比分析结果表明,MP-DOA算法在低信噪比情况下较其他3种算法性能更优越,SP-DOA算法在角度分辨率和对信源数的包容方面的性能较其他3种算法优越,也验证了应用压缩感知理论的优越性。展开更多
基金Supported by the National Natural Science Foundation of China(No.61802304,61834005,61772417,61634004)the Shaanxi Province Key R&D Plan(No.2021GY-029).
文摘The reconfigurable chip,which integrates the advantages of high performance,high flexibility,high parallelism,low power consumption,and low cost,has achieved rapid development and wide application.Generally,the control part and the computing part of algorithm is accelerated based on different reconfigurable architectures,but it is difficult to obtain overall performance improvement.For improving efficiency of reconfigurable structure both for the control part and the computing part,a hybrid of instruction-driven and data-driven self-reconfigurable cell array is proposed.On instruction-driven mode,processing element(PE)works like a reduced instruction set computer(RSIC)machine,which is mainly for the control part of algorithm.On data-driven mode,data is calculated by flowing between the preconfigured PEs,which is mainly for the computing of algorithm.For verifying the efficiency of architecture,some high-efficiency video coding(HEVC)video compression algorithms are implemented on the proposed architecture.The proposed architecture has been implemented on Xilinx FPGA Virtex UltraScale VU440 develop board.The same circuitry is able to run at75 MHz.Compared with the architecture that only supports instruction-driven,the proposed architecture has better calculation efficiency.
文摘目的:观察中医穴位按摩对腹部手术患者术后胃肠功能恢复的影响。方法:将80例需行腹部手术的患者随机分为观察组与对照组各40例。对照组术后予以常规照护模式,观察组在对照组基础上自术后6 h起加以穴位按摩,直至肛门首次排气为止。比较2组手术前后胃肠激素水平、术后肠鸣音恢复时间、首次肛门排气时间、首次排便时间、腹胀发生率、腹胀缓解时间、恢复正常饮食时间、住院天数及术后视觉模拟评分法(VAS)评分。结果:与同组术前比较,2组术后胃动素(MTL)、P物质(SP)水平均升高(P<0.05),生长抑素(SS)水平均降低(P<0.05);与对照组术后比较,观察组术后MTL、SP水平均较高(P<0.05),SS水平较低(P<0.05)。观察组术后肠鸣音恢复时间、首次肛门排气时间及排便时间、腹胀缓解时间、恢复正常饮食时间及住院天数均明显短于对照组(P<0.05),腹胀发生率低于对照组(P<0.05)。2组术后6 h VAS评分比较,差异无统计学意义(P>0.05),观察组术后12 h、24 h、48 h VAS评分均低于对照组(P<0.05)。结论:穴位按摩可有效改善腹部手术患者术后胃肠道功能,减轻疼痛不适感,促进康复。
基金Supported by the National Natural Science Foundation of China(No.61834005,61772417,61802304,61602377,61874087,61634004)the Shaanxi Province Key R&D Plan(No.2021GY-029,2021KW-16).
文摘Based on the flexible quadtree partition structure of coding tree units(CTUs),the deblocking filter(DBF)in high efficiency video coding(HEVC)consumes a lot of resources when implemen-ted by hardware.It is difficult to achieve flexible switching between different sizes of coding blocks.Aiming at this problem,a reconfigurable implementation of DBF is proposed.Based on the dynamic programmable reconfigurable video array processor(DPRAP)with context switch reconfiguration mechanism,the runtime flexible switching of two coding block sizes is realized.The experimental results show that the highest work-frequency reaches 151.4 MHz.Compared with the dedicated hardware architecture scheme,the resource consumption can be reduced by 28.1%while realizing the dynamic switching between algorithms of two coding block sizes.Compared with the results of HM16.0,by using a complete I-frame for testing,the average peak signal-to-noise ratio(PSNR)of the reconfigurable implementation proposed in this paper has increased by 3.0508 dB,the coding quality has improved to a certain extent.
文摘波达方向(direction of arrival,DOA)估计是利用具有一定空间结构的天线阵元对空间信源的来波方向进行估计。为解决MUSIC算法和ESPRIT算法在智能天线DOA估计中空间谱分辨率和抗噪声性能方面的不足,依据压缩感知理论的贪婪算法思想,将匹配追踪(matching pursuit,MP)算法和子空间追踪(subspace pursuit,SP)算法应用在DOA估计中,即提出2种新的算法MP-DOA和SP-DOA。这2种算法主要包括原子库建立、信号投影、最佳匹配原子筛选及信号特征提取等过程。4种算法的仿真实验与对比分析结果表明,MP-DOA算法在低信噪比情况下较其他3种算法性能更优越,SP-DOA算法在角度分辨率和对信源数的包容方面的性能较其他3种算法优越,也验证了应用压缩感知理论的优越性。
