关键词： 中央油源   自适应   压力扰动   低功耗   瞬态流量  

摘要： 针对伺服阀对于压力极为敏感的测试要求,采用中央油源取代多台独立油源是液压行业多年来一直亟待突破的技术。本文依照产品测试项目和测试条件,建立了半物理仿真模型,并根据仿真测试结果对影响伺服阀试验台压力稳定性的关键因素进行了分析,按照分析结果进行了原理样机的搭建,并降低了油源的能耗水平,最终的测试结果中央油源的压力稳定性满足设计要求,可实现多台阀类产品在同一油源下的无干扰测试。

关键词： 电池使用寿命   串联电池组   电池产品   锂电池   供电设备   自放电率   单体电池   均衡控制  

摘要： 现代电子设备飞速发展,锂电池作为目前应用最为广泛的供电设备,更加安全、节能的充电方式、对延长电池使用寿命以及保证电池产品的稳定高效使用有着重要意义。由于电池组由诺干个单体电池构成,每个单体电池的充放电接受能力、自放电率、容量衰减速率不同,导致单体电池之间的SOC不均衡,为确保锂电池组的性能良好,充分利用动力电池的能量、延长电池的寿命,本文设计一种双向BuckBoost型主动均衡控制系统,在Simulink中建立均衡控制仿真模型,实验结果表明,本文设计的均衡系统不仅可以使锂电池进行充放电均衡,而且有效提高了串联电池组单体锂电池的一致性。

关键词： Analytical models   Computational modeling   Integrated circuit modeling   Task analysis   Model checking   Mathematical model   Load modeling   Centralized   distributed   dynamic thermal management (DTM)   formal analysis   formal verification   many-core   model checking   nuXmv   task migration  

摘要： Dynamic thermal management (DTM) techniques are being widely used for attenuation of thermal hot spots in many-core systems. Conventionally, DTM techniques are analyzed using simulation and emulation methods, which are in-exhaustive due to their inherent limitations and cannot provide for a comprehensive comparison between DTM techniques owing to the wide range of corresponding design parameters. In order to handle the above discrepancies, we propose to use model checking, a state-space-based formal method, to model, evaluate, and compare DTM techniques across various functional and performance parameters. The suggested framework includes a modeling flow and a set of generic modules that realistically model many-core and DTM parameters like temperature, power, application, intercore communication and task migration, etc. For analysis purpose, the framework provides a common ground for comparing DTM techniques by formalizing DTM principles and performance parameters as a set of logical properties. These properties are verified for different task load configurations, e.g., multithreaded, malleable, and the applications which do not support migration. We analyze state-of-the-art central (c-) and distributed (d-) DTM techniques to demonstrate the generality and efficacy of our approach. Our formal analysis shows that the state-of-the-art cDTM technique performs better than dDTM in terms of achieving thermal stability, task migration, and communication overhead. We believe that conventional analysis methods do not facilitate such an exhaustive comparison among the DTM techniques.

关键词： Fuzzy clustering   CT image   Feature region   Deep learning   Multithreading   3D reconstruction  

摘要： Traditional technology uses serial processing method in CT image feature extraction. It is prone to loss of image data, which causes problems such as ring distortion of the reconstructed image and long reconstruction time. Therefore, a three-dimensional (3D) reconstruction algorithm for CT image features based on multi-threaded deep learning calculation is designed. Feature image textures are segmented using parameters such as gray, mean, and variance. Fusion calculates co-occurrence logarithm of the gray level with segmented sub-block and its pixels. Co-occurrence probability of the sub-block gray levels is obtained, followed by getting optimal feature volume data, which is stored in 3D texture and 1D texture for interpolation *** optimal feature volume data is stored in 3D and 1D texture for interpolation calculation. Rotation matrix is stored in the global storage space of CUDA, which is used for multi-threaded calculations. After completing multi-threaded batch CT image hardware configuration and algorithm flow settings, the thread's index and bounding box is calculated. 3D reconstruction of CT image features is achieved by model accumulation. The experimental simulation proves that local detail information loss is small after reconstruction of the proposed method. Its reconstruction time is short and has good applicability. (C) 2020 Elsevier B.V. All rights reserved.

关键词： Linux操作系统  

ISBN: (纸本)9787115444929

摘要： 本书是一本基于龙芯平台来解析Linux内核的书籍，首先介绍了有关龙芯处理器和Linux内核的基础知识，而后的主要内容包含内核启动、异常/中断处理、内存管理、进程管理、显卡驱动、网卡驱动和电源管理等七大版块。

关键词： Sparse triangular linear systems   Direct methods   Parallel computing  

摘要： We propose a parallel sparse triangular linear system solver based on the Spike algorithm. Sparse triangular systems are required to be solved in many applications. Often, they are a bottleneck due to their inherently sequential nature. Furthermore, typically many successive systems with the same coefficient matrix and with different right hand side vectors are required to be solved. The proposed solver decouples the problem at the cost of extra arithmetic operations as in the banded case. Compared to the banded case, there are extra savings due to the sparsity of the triangular coefficient matrix. We show the parallel performance of the proposed solver against the stateof-the-art parallel sparse triangular solver in Intel's Math Kernel Library (MKL) on a multicore architecture. We also show the effect of various sparse matrix reordering schemes. Numerical results show that the proposed solver outperforms MKL's solver in similar to 80% of cases by a factor of 2.47, on average. (C) 2019 Elsevier Ltd. All rights reserved.

关键词： 低功耗蓝牙   电子产品   Bluetooth   芯片级   智能手机   智能门锁   智能家居   Home  

摘要： Nordic Semiconductor宣布智能手机和电子产品巨头小米的企业生态系统成员深圳绿米联创科技有限公司已经选择Nordic的n RF52840 Bluetooth®5.2/低功耗蓝牙(Bluetooth®Low Energy/BluetoothLE)先进多协议芯片级系统(SoC),为其"Aqara智能门锁N200"提供无线连接功能。

关键词： 嵌入式技术   超低功耗系统   红外光通信系统   嵌入式组网技术  

摘要： 传统红外光通信系统在运行的过程中,需要巨大的功耗来维持运行,且实际操作过程中复杂度较高。为此提出基于嵌入式技术的超低功耗红外光通信系统设计。首先给出红外光通信系统总体框架,对该系统的硬件部分进行设计,在硬件设计的基础上,提出软件运行时的数学理论支持,最后通过嵌入式组网技术对该系统的网络进行组合和连接,实现通信功能。经过仿真实验验证,设计系统的功耗较低,误码率较低,能够有效提高红外光通信系统的通信性能。