共查询到20条相似文献,搜索用时 15 毫秒
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该文根据异步串行通信的特点,分析了UART8250与MODEM的相互关系,讨论了编制异步串行通信程序中的中断机制、流量控制、数据缓冲等关键问题,并给出了设计例程。 相似文献
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本叙述了利用现有电话网进行计算机数据通信的系统构成及硬件,介绍了异步串行通信程序设计中的中断机制,流量控制,数据缓冲等关键问题。 相似文献
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TMS320C54XX系列DSP异步串行数据传输的研究与实现 总被引:2,自引:0,他引:2
美国TI公司TMS320C54XX系列DSP芯片,其片上未提供通用异步串行收发器(UART),而只有2—3个多通道缓冲同步串行接口(McBSP),对于与微机及其它设备进行异步数据传输的应用,必须在DSP上扩展异步串口。采用MAXIM公司的MAX3111异步串行收发器,以SPI方式与DSP直接接口,在硬件连接简单,软件编程方便的情况下,实现了同步到异步RS-232数据传输的转换,其数据通信正确、可靠,已经在工程实践中得到了很好的应用。本文详细论述了这种方法的软硬件实现。 相似文献
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WIN32下基于线程的异步串行通信 总被引:1,自引:1,他引:1
在串行通信中引入线程,可降低数据丢失率以及提高系统的可靠性,本文介绍了用DELPI3.0实现基于线程的32位异步串行通信,通过介绍读/写线程解释了WIN32多线程思想在通信编程中的应用。 相似文献
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本文首先介绍了异步串行通信的工作方式,然后给出了VB MSComm控件下异步串行通信在电子衡器中的应用实例,包括硬件接口及软件设计。 相似文献
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《Expert systems with applications》2014,41(6):2842-2850
Principal component analysis (PCA) is often applied to dimensionality reduction for time series data mining. However, the principle of PCA is based on the synchronous covariance, which is not very effective in some cases. In this paper, an asynchronism-based principal component analysis (APCA) is proposed to reduce the dimensionality of univariate time series. In the process of APCA, an asynchronous method based on dynamic time warping (DTW) is developed to obtain the interpolated time series which derive from the original ones. The correlation coefficient or covariance between the interpolated time series represents the correlation between the original ones. In this way, a novel and valid principal component analysis based on the asynchronous covariance is achieved to reduce the dimensionality. The results of several experiments demonstrate that the proposed approach APCA outperforms PCA for dimensionality reduction in the field of time series data mining. 相似文献
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对临床检验指标时间序列进行聚类,从中发现临床检验指标变化趋势相似的患者群体,对开展精准医疗具有非常重要的价值。考虑到不同患者的检验次数及检验时间点不完全同步,首先通过对非同步时间序列进行预处理,实现不同时间序列维度及时间点的同步化。在此基础上,通过引入一个用户自定义参数即噪声点占有率NoisePro,对DBScan算法进行改进,提出了一种基于密度划分思想的非同步临床检验指标时间序列聚类LabTS-CLU算法。最后利用某三甲医院十余万糖尿病患者近10年的糖化血红蛋白时间序列数据集进行实验,结果证明了所提算法的有效性。 相似文献
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《IEEE transactions on pattern analysis and machine intelligence》1978,(6):507-516
Synchronous and asynchronous operation of software systems are defined. It is argued that certifying the correct operation of a system in the synchronous mode is significantly simpler than in the asynchronous mode. A series of compile-time and run-time restrictions for systems constructed in Concuirent Pascal are presented which assure equivalent operation in the synchronous and asynchronous modes. 相似文献
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基于UKF的变采样率多异质传感器异步数据融合 总被引:1,自引:0,他引:1
针对异质传感器数据融合能够实现信息互补,改善目标跟踪精度,提出了一种多异质传感器在变采样率下的异步量测融合算法,即首先将多传感器数据组合成类似于单传感器数据的异步数据处理方法,进行点迹合成,再将合成后的虚拟量测对当前时刻的目标状态进行更新.变采样率跟踪是基于网络或栅格多传感器异步融合跟踪的基础,通过引入时戳的概念给出了基于UKF(Unscented Kalman Filter)的具体融合算法,最后通过仿真验证了该算法的有效性。 相似文献
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This article reports on recent work to introduce a model of scalable, asynchronous library instruction into the First-Year Writing Program at James Madison University inspired by the premise: Scalable equals asynchronous and asynchronous equals boring. Or does it? The authors describe how a small team from Libraries &; Educational Technologies at James Madison University planned and built an asynchronous, modular tutorial series, primarily designed to motivate students to engage with the library instruction contained within it. Information literacy instruction was provided using a tool called “Guide on the Side” and employed short scenario videos and additional content, followed by activities and assessment, in order to improve student outcomes and engagement. In this foundational program, the new and engaging asynchronous materials became the first step of a library instruction model that aimed to reach as many students as possible, while still being sustained by one librarian. 相似文献
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通过Axis2异步调用实现较大数据传输WEB服务 总被引:1,自引:0,他引:1
邓式阳 《计算机应用与软件》2008,25(7)
Axis2支持 WSDL 2.0 定义的In-Out消息交换模式,可以在 API 级别和传输级别提供异步行为,能够很好地解决Web服务中大数据长时间传输问题.研究Axis2异步Web服务实现较大数据的传输方法,并以车辆收费数据传输服务为例,给出具体实现方法. 相似文献