Digital video technology is burgeoning new standards broadening the gamut of prerequisites such as high definition video quality and more resolution substantially at lower bit rates than previous standards.Among the l...Digital video technology is burgeoning new standards broadening the gamut of prerequisites such as high definition video quality and more resolution substantially at lower bit rates than previous standards.Among the latest video compression algorithms,the newly established H.264 standard has become increasingly popular.However,the high coding efficiency of it comes at the cost of increase in computational complexity which makes the real-time implementation a great challenge.Previous works in video compression implement a dual core DSP processor executing this composite H.264 algorithm in parts,but has certain bottlenecks like timing,reliability and efficiency with a small overhead of synchronization.With higher interprocessor bus speeds,streamlined memory and a highly programmable FPGA multi-core architecture the limitations of current platforms based on DSPs and ASICs can be overwhelmed.This paper presents an FPGA based multicore processor implementation to optimize the H.264 encoder performance between the cores providing scalability,attaining load balance among the cores and parallel execution reducing the dependability of resources.This enables a more effectual use of processing power of the cores.展开更多
目前,多核实时系统中同步任务的节能调度研究主要针对的是同构多核处理器平台,而异构多核处理器架构能够更有效地发挥系统性能。将现有的研究直接应用于异构多核系统,在保证可调度性的情况下会导致能耗变高。对此,通过使用动态电压与频...目前,多核实时系统中同步任务的节能调度研究主要针对的是同构多核处理器平台,而异构多核处理器架构能够更有效地发挥系统性能。将现有的研究直接应用于异构多核系统,在保证可调度性的情况下会导致能耗变高。对此,通过使用动态电压与频率调节(Dynamic Voltage Frequency Scaling,DVFS)技术,研究异构多核实时系统中基于任务同步的节能调度问题,提出同步感知的最大能耗节省优先算法(Synchronization Aware-Largest Energy Saved First,SA-LESF)。该算法针对所有任务的速度配置进行迭代优化,直至所有任务均达到其最大限度节能的速度配置。此外,进一步提出基于动态松弛时间回收的同步感知最大能耗节省优先算法(Synchronization Aware-Largest Energy Saved First with Dynamic Reclamation,SA-LESF-DR)。该算法在保证实时任务可调度的同时,实施相应的回收策略,进一步降低系统能耗。实验结果表明,SA-LESF与SA-LESF-DR算法在能耗表现上具有优势,在相同任务集下,相比其他算法可节省高达30%的能耗。展开更多
To improve image processing speed and detection precision of a surface detection system on a strip surface,based on the analysis of the characteristics of image data and image processing in detection system on the str...To improve image processing speed and detection precision of a surface detection system on a strip surface,based on the analysis of the characteristics of image data and image processing in detection system on the strip surface,the design of parallel image processing system and the methods of algorithm implementation have been studied. By using field programmable gate array(FPGA) as hardware platform of implementation and considering the characteristic of detection system on the strip surface,a parallel image processing system implemented by using multi IP kernel is designed. According to different computing tasks and the load balancing capability of parallel processing system,the system could set different calculating numbers of nodes to meet the system's demand and save the hardware cost.展开更多
We demonstrate a new kind of multi-core photonic liquid crystal fibers (PLCFs) which have six liquid crystal cores arrayed in the ring-type geometry and separated by the air holes. Through analyzing the structure of t...We demonstrate a new kind of multi-core photonic liquid crystal fibers (PLCFs) which have six liquid crystal cores arrayed in the ring-type geometry and separated by the air holes. Through analyzing the structure of this kind of PLCFs, it can be found that they have the ability to resist the structure deformation. Due to the effective index of the liquid crystal can be adjusted by temperature and wavelength, the energy in the six liquid crystal cores is increased with the temperature increasing and wavelength decreasing. The effective index of the PLCFs is decreased, the effective fundamental mode area is increased and the dispersion properties are gently affected with the wavelength increasing and temperature decreasing.展开更多
Quantum key distribution(QKD)is a secure communication method for sharing symmetric cryptographic keys based on the principles of quantum physics.Its integration into the fiber-optic network infrastructure is importan...Quantum key distribution(QKD)is a secure communication method for sharing symmetric cryptographic keys based on the principles of quantum physics.Its integration into the fiber-optic network infrastructure is important for ensuring privacy in optical communications.Multi-core fibers(MCFs),the likely building blocks of future high-capacity optical networks,offer new opportunities for such integration.Here,we experimentally demonstrate,for the first time,the coexistence of discrete-variable QKD and high-throughput classical communication in the C-band over a fielddeployed MCF with industry standard cladding diameter of 125μm.Specifically,we demonstrate successful secure-key establishment in one core of a 25.2-km uncoupled-core MCF,while simultaneously loading the remaining three cores with full C-band counter-propagating classical traffic at an aggregate net rate of 110.8 Tb/s.By proposing and experimentally validating an improved analytical model for inter-core spontaneous Raman scattering noise,we find that this configuration is optimal for our deployed MCF link as it is immune to four-wave mixing,that becomes relevant when the quantum and classical signals are propagating in the same direction.Our findings make an important step forward in demonstrating the integration of QKD and classical transmission in uncoupled-core multicore fibers for next-generation optical communication networks.展开更多
This report presents the design and implementation of a Distributed Data Acquisition、 Monitoring and Processing System (DDAMAP)。It is assumed that operations of a factory are organized into two-levels: client machin...This report presents the design and implementation of a Distributed Data Acquisition、 Monitoring and Processing System (DDAMAP)。It is assumed that operations of a factory are organized into two-levels: client machines at plant-level collect real-time raw data from sensors and measurement instrumentations and transfer them to a central processor over the Ethernets, and the central processor handles tasks of real-time data processing and monitoring. This system utilizes the computation power of Intel T2300 dual-core processor and parallel computations supported by multi-threading techniques. Our experiments show that these techniques can significantly improve the system performance and are viable solutions to real-time high-speed data processing.展开更多
基于软件实现的多核系统模拟器执行计算密集/数据密集任务的时效性极差,且存在模拟精度和性能评估准确性差的不足,限制其在多核系统结构优化探索中的应用。文章提出一种周期精确的软硬件协同多核系统模拟器(cycle accurate hardware-sof...基于软件实现的多核系统模拟器执行计算密集/数据密集任务的时效性极差,且存在模拟精度和性能评估准确性差的不足,限制其在多核系统结构优化探索中的应用。文章提出一种周期精确的软硬件协同多核系统模拟器(cycle accurate hardware-software co-simulator,CAHSCS),通过在传统模拟器架构中引入硬件计算和存储模块,CAHSCS能有效改善全系统的模拟速度、精度,提高性能评估的准确性。复杂真实任务加载实验结果表明,CAHSCS将大规模复杂数据的运算效率提高了10倍,显著加快了系统设计收敛速度。展开更多
文摘Digital video technology is burgeoning new standards broadening the gamut of prerequisites such as high definition video quality and more resolution substantially at lower bit rates than previous standards.Among the latest video compression algorithms,the newly established H.264 standard has become increasingly popular.However,the high coding efficiency of it comes at the cost of increase in computational complexity which makes the real-time implementation a great challenge.Previous works in video compression implement a dual core DSP processor executing this composite H.264 algorithm in parts,but has certain bottlenecks like timing,reliability and efficiency with a small overhead of synchronization.With higher interprocessor bus speeds,streamlined memory and a highly programmable FPGA multi-core architecture the limitations of current platforms based on DSPs and ASICs can be overwhelmed.This paper presents an FPGA based multicore processor implementation to optimize the H.264 encoder performance between the cores providing scalability,attaining load balance among the cores and parallel execution reducing the dependability of resources.This enables a more effectual use of processing power of the cores.
文摘目前,多核实时系统中同步任务的节能调度研究主要针对的是同构多核处理器平台,而异构多核处理器架构能够更有效地发挥系统性能。将现有的研究直接应用于异构多核系统,在保证可调度性的情况下会导致能耗变高。对此,通过使用动态电压与频率调节(Dynamic Voltage Frequency Scaling,DVFS)技术,研究异构多核实时系统中基于任务同步的节能调度问题,提出同步感知的最大能耗节省优先算法(Synchronization Aware-Largest Energy Saved First,SA-LESF)。该算法针对所有任务的速度配置进行迭代优化,直至所有任务均达到其最大限度节能的速度配置。此外,进一步提出基于动态松弛时间回收的同步感知最大能耗节省优先算法(Synchronization Aware-Largest Energy Saved First with Dynamic Reclamation,SA-LESF-DR)。该算法在保证实时任务可调度的同时,实施相应的回收策略,进一步降低系统能耗。实验结果表明,SA-LESF与SA-LESF-DR算法在能耗表现上具有优势,在相同任务集下,相比其他算法可节省高达30%的能耗。
基金The 111 project(B07018) Supported by Program for Changjiang Scholars and Innovative Research Teamin University(IRT0423)
文摘To improve image processing speed and detection precision of a surface detection system on a strip surface,based on the analysis of the characteristics of image data and image processing in detection system on the strip surface,the design of parallel image processing system and the methods of algorithm implementation have been studied. By using field programmable gate array(FPGA) as hardware platform of implementation and considering the characteristic of detection system on the strip surface,a parallel image processing system implemented by using multi IP kernel is designed. According to different computing tasks and the load balancing capability of parallel processing system,the system could set different calculating numbers of nodes to meet the system's demand and save the hardware cost.
基金supported by the National Natural Science Foundation of China (Nos.61077047 and 61107059)the Natural Science Foundation of Heilongjiang Province (No.A200914)the Research Fund for the Doctoral Program of Higher Education of China (No.200802171034)
文摘We demonstrate a new kind of multi-core photonic liquid crystal fibers (PLCFs) which have six liquid crystal cores arrayed in the ring-type geometry and separated by the air holes. Through analyzing the structure of this kind of PLCFs, it can be found that they have the ability to resist the structure deformation. Due to the effective index of the liquid crystal can be adjusted by temperature and wavelength, the energy in the six liquid crystal cores is increased with the temperature increasing and wavelength decreasing. The effective index of the PLCFs is decreased, the effective fundamental mode area is increased and the dispersion properties are gently affected with the wavelength increasing and temperature decreasing.
基金funded by the European Commission through European Union—Next Generation EU,under the Italian National Recovery and Resilience Plan,Mission 4,Component 2,Investment 1.3,CUP B53C22003970001,partnership on“Telecommunications of the Future”(PE00000001—program“RESTART”)in the Digital Europe Program under project QUID(Quantum Italy Deployment)Grant Agreement 101091408funding from the European Commission through ERC StG,QOMUNE,Grant Agreement 101077917.
文摘Quantum key distribution(QKD)is a secure communication method for sharing symmetric cryptographic keys based on the principles of quantum physics.Its integration into the fiber-optic network infrastructure is important for ensuring privacy in optical communications.Multi-core fibers(MCFs),the likely building blocks of future high-capacity optical networks,offer new opportunities for such integration.Here,we experimentally demonstrate,for the first time,the coexistence of discrete-variable QKD and high-throughput classical communication in the C-band over a fielddeployed MCF with industry standard cladding diameter of 125μm.Specifically,we demonstrate successful secure-key establishment in one core of a 25.2-km uncoupled-core MCF,while simultaneously loading the remaining three cores with full C-band counter-propagating classical traffic at an aggregate net rate of 110.8 Tb/s.By proposing and experimentally validating an improved analytical model for inter-core spontaneous Raman scattering noise,we find that this configuration is optimal for our deployed MCF link as it is immune to four-wave mixing,that becomes relevant when the quantum and classical signals are propagating in the same direction.Our findings make an important step forward in demonstrating the integration of QKD and classical transmission in uncoupled-core multicore fibers for next-generation optical communication networks.
文摘This report presents the design and implementation of a Distributed Data Acquisition、 Monitoring and Processing System (DDAMAP)。It is assumed that operations of a factory are organized into two-levels: client machines at plant-level collect real-time raw data from sensors and measurement instrumentations and transfer them to a central processor over the Ethernets, and the central processor handles tasks of real-time data processing and monitoring. This system utilizes the computation power of Intel T2300 dual-core processor and parallel computations supported by multi-threading techniques. Our experiments show that these techniques can significantly improve the system performance and are viable solutions to real-time high-speed data processing.
文摘基于软件实现的多核系统模拟器执行计算密集/数据密集任务的时效性极差,且存在模拟精度和性能评估准确性差的不足,限制其在多核系统结构优化探索中的应用。文章提出一种周期精确的软硬件协同多核系统模拟器(cycle accurate hardware-software co-simulator,CAHSCS),通过在传统模拟器架构中引入硬件计算和存储模块,CAHSCS能有效改善全系统的模拟速度、精度,提高性能评估的准确性。复杂真实任务加载实验结果表明,CAHSCS将大规模复杂数据的运算效率提高了10倍,显著加快了系统设计收敛速度。
