关键词： iBeacon   蓝牙4.0   三环定位算法   补偿算法   低功耗  

摘要： 现代社会中,GPS定位被应用广泛,已经融入生活。但是GPS定位系统主要为室外定位提供服务,若是在室内的话,它的定位精确度将成为它的劣势。这里我们报告了一个提高准确性的策略——一种基于iBeacon基站的蓝牙4.0室内定位技术。该技术能够在室内精确定位,以弥补GPS室内定位的不足性。并且通过改良版三环定位算法以及根据特定室内场景编写补偿算法,能够实现定位的准确性,并且一颗纽扣电池可以蓝牙基站维持使用数年,真正达到低功耗。

关键词： LoRa   微功率无线   故障指示器   低成本   长距离   低功耗  

摘要： 针对微功率无线通信距离短、故障指示器成本较高的缺点,文章提出了长距离、低功耗的LoRa解决方案。首先从覆盖范围、速率、时延和功耗等方面详细阐述了LoRa与故障指示器业务需求之间的技术匹配度;然后通过比较基于LoRa和微功率无线技术的故障指示器成本,分析了方案的经济效益;最后对系统进行了测试分析,试验结果表明该方案具有通信距离远、功耗低、组网便捷等特点,有广泛的应用前景。

关键词： Computer architecture   parallel architecture   simultaneous multithreading  

摘要： We propose a variation of round-robin ordering in an multi-threaded pipeline to increase system throughput and resource distribution fairness. We show that using round robin with a typical arbitrary ordering results in inefficient use of shared resources and subsequent thread starvation. To address this but still use a simple round-robin approach, we optimally and dynamically sort the order of the round robin periodically at runtime. We show that with 4-threaded workloads, throughput can be improved by over 9% and harmonic throughput by over 3% by sorting thread order at run time. We experiment with multiple stages of the pipeline and show consistent results throughout several experiments using the SPEC CPU 2006 benchmarks. Furthermore, since the technique is still a simple round robin, the increased performance requires little overhead to implement.

关键词： JAVA语言  

ISBN: (纸本)9787121360350

摘要： 本书先逐一介绍Java微服务框架所需要的基础知识，包括：多线程、Socket、Spring 容器技术、动态代理、动态字节码、序列化等技术。然后介绍了一种微服务框架的架构设计。再将这一微服务框架分解为底层Socket通信、服务注册与发现、服务暴露与引用、远程方法调用等层面，逐一讲解。详细介绍作者是如何基于这些技术来构建这样一套完整的微服务框架的。最后对微服务框架和微服务治理系统进行了介绍。从基础知识入手，逐步将读者带入Java微服务与分布式技术领域。

关键词： circuit simulation   MATLAB   multithreading   rational approximation   scattering parameters   vector fitting  

摘要： The vector fitting method has been largely used to generate accurate and passive time-domain macromodels for circuits or structures characterized by frequency-domain data such as scattering parameters. Nevertheless, very few approaches to determine the vector fitting order were discussed in the literature. In this paper, an iterative method to automatically identify the number of vector fitting poles is proposed. It can achieve acceptable performance and accuracy by capitalizing on the fact that the number of vector fitting poles lies in the range that spans the number of resonance peaks in the model and double that number as deduced from the empirical data that was acquired by experimentation on different types of models. Therefore, the algorithm's awareness of the frequency response of the model and confining the search for an acceptable order within the aforementioned range proved to be key factors to enable it to mostly outperform its MATLAB counterpart as shown in the experimental results. Furthermore, a multithreaded implementation of the proposed method is introduced to distribute the vector fitting passes on multicore processors in order to obtain a better speedup factor. The experiments that demonstrate the positive effect of the multithreaded version on performance are also presented.

关键词： 传感器网络   数据采集   智能楼宇  

摘要： 该文研究应用ZigBee技术,结合Internet网络,提出了以CC2530芯片为核心的智能楼宇环境监测混合传感器网络系统方案,完成了小型ZigBee网络的搭建。监测网络有传感器、协调器和上位机软件组成,其中,传感器节点采集环境监测数据,并通过Internet网络传送到远端上位机监测平台。系统实现了对环境温湿度、烟雾、火焰等参数的连续监测,传感器测量数据准确可靠,满足预期效果。

关键词： Algorithms   Applied mathematics   Bioinformatics   Biology and life sciences   Cognitive psychology   Cognitive science   Computational biology   Computational pipelines   Computational techniques   Computer and information sciences   Database and informatics methods   Genetics   Genome analysis   Genomic libraries   Genomics   Language   Mathematics   Molecular biology   Molecular biology techniques   Neuroscience   Physical sciences   Programming languages   Psychology   Research and analysis methods   Research Article   Sequence alignment   Sequence analysis   Sequencing techniques   Simulation and modeling   Social sciences   Software pipelines  

摘要： We present elPrep 4, a reimplementation from scratch of the elPrep framework for processing sequence alignment map files in the Go programming language. elPrep 4 includes multiple new features allowing us to process all of the preparation steps defined by the GATK Best Practice pipelines for variant calling. This includes new and improved functionality for sorting, (optical) duplicate marking, base quality score recalibration, BED and VCF parsing, and various filtering options. The implementations of these options in elPrep 4 faithfully reproduce the outcomes of their counterparts in GATK 4, SAMtools, and Picard, even though the underlying algorithms are redesigned to take advantage of elPrep's parallel execution framework to vastly improve the runtime and resource use compared to these tools. Our benchmarks show that elPrep executes the preparation steps of the GATK Best Practices up to 13x faster on WES data, and up to 7.4x faster for WGS data compared to running the same pipeline with GATK 4, while utilizing fewer compute resources.

关键词： Semiconductors   Radiation detectors   RD50   Transient current technique   Ramo current simulator  

摘要： The requisites at the Large Hadron Collider (LHC) at CERN have driven silicon tracking detectors to the fringe of the modern technology. The next upgrade of the LHC to a 10 times increased luminosity of 7.5x10(34) cm(-2) s(-1) will require semiconductor detectors with substantially improved radiation hardness. CERN-RD50 collaboration mandate is to provide detector technologies, which are able to operate in such an environment. Within this context, this paper describes the approaches and first results of a C++11 multi-threading software based on the Shockley-Ramo's theorem to simulate non-irradiated and irradiated silicon micro-strips and pad detectors of complex geometries in order to understand signal formation and charge collection efficiencies of arbitrary charge distributions.

关键词： Python语言   TCP协议   套接字   多线程  

摘要： 介绍了网络编程和Socket的基本概念,然后介绍了基于Socket的3种并发模型的原理、优缺点和实现过程,重点研究了基于多线程的并发服务器模型的原理和实现。

关键词： 字符串匹配   CPU   GPU   测试优化   多线程   多进程  

摘要： 该文实验模拟数据流在本地或集群分布式处理的条件下,多线程多进程、CPU+GPU异构等处理模式的字符串匹配测试,研究了在多进程,多线程下最佳并行运行节点数,GPU最佳优化参数设置,CPU+GPU异构环境下最佳搭配优化方案。