采用MCU多层神经网络模型设计探讨

于2010-11-23批量导入

TI C28X系列MCU电源管理设计TI C28X系列MCU电源管理设计

A brief summary of TI C28X MCU is presented in this paper. The key points of power management design for all C28X MCU based on different requirements on power management are proposed. Two different solutions of power management design with specific examples can help C28X MCU developers with technical advice and have positive impact on application of C28X MCU in the field of industrial control.中文摘要：本文对 TI C28X 系列 MCU 作了简要归纳和介绍 针对各款 MCU 对电源管理的不同要求,提出了全系列 MCU 的电源管理部分设计要点,总结了两类不同的电源管理设计方案,对每类方案均给出了具体的设计案例 为 C28X 系列 MCU 的电源管理设计提供了技术指导,对促进 C28X 系列 MCU 在工业控制领域内的应用有积极的意义.

基于RS-485总线和MCU的频率合成器设计

本文主要介绍一款基于RS-485总线和MCU的频率合成器,重点介绍了频率合成器的总体结构,RS-485总线接口电路,高集成度频率合成芯片AD9850的外围硬件电路和控制软件。该合成器输出频率范围:5~40MHz,最小频率步进为≤20Hz,输出正弦波或方波幅度800mV。该频率合成器具有结构简单,精度高,控制灵活的特点。

基于ARM、CPLD和MCU的冷却储存环真空控制系统设计

以ARM(S3C4510B)、CPLD(XC95288XL)和微控制器(MSP430F149)为核心进行实时多路数据采集和控制的冷却储存环(CSR)真空控制系统设计。着重分析了控制系统组成、工作原理、功能实现、硬件电路和软件开发。该控制系统具有适应性与灵活性强、响应速度快、精度高、稳定性好、可靠性高、性价比优越、自我连锁保护等优点,现已成功应用于CSR真空控制系统中。

Assessment of gene expression of intracellular calcium channels, pumps and exchangers with epidermal growth factor-induced epithelial-mesenchymal transition in a breast cancer cell line

Background Epithelial-mesenchymal transition (EMT) is a process implicated in cancer metastasis that involves the conversion of epithelial cells to a more mesenchymal and invasive cell phenotype. In breast cancer cells EMT is associated with altered store-operated calcium influx and changes in calcium signalling mediated by activation of cell surface purinergic receptors. In this study, we investigated whether MDA-MB-468 breast cancer cells induced to undergo EMT exhibit changes in mRNA levels of calcium channels, pumps and exchangers located on intracellular calcium storing organelles, including the Golgi, mitochondria and endoplasmic reticulum (ER). Methods Epidermal growth factor (EGF) was used to induce EMT in MDA-MB-468 breast cancer cells. Serum-deprived cells were treated with EGF (50 ng/mL) for 12 h and gene expression was assessed using quantitative RT-PCR. Results and conclusions These data reveal no significant alterations in mRNA levels of the Golgi calcium pump secretory pathway calcium ATPases (SPCA1 and SPCA2), or the mitochondrial calcium uniporter (MCU) or Na+/Ca2+ exchanger (NCLX). However, EGF-induced EMT was associated with significant alterations in mRNA levels of specific ER calcium channels and pumps, including (sarco)-endoplasmic reticulum calcium ATPases (SERCAs), and inositol 1,4,5-trisphosphate receptor (IP3R) and ryanodine receptor (RYR) calcium channel isoforms. The most prominent change in gene expression between the epithelial and mesenchymal-like states was RYR2, which was enriched 45-fold in EGF-treated MDA-MB-468 cells. These findings indicate that EGF-induced EMT in breast cancer cells may be associated with major alterations in ER calcium homeostasis.

A comparison of training methods to increase neck muscle strength

Objective To compare two neck strength training modalities. Background Neck injury in pilots flying high performance aircraft is a concern in aviation medicine. Strength training may be an effective means to strengthen the neck and decrease injury risk. Methods The cohort consisted of 32 age-height-weight matched participants, divided into two experimental groups; the Multi-Cervical Unit (MCU) and Thera-Band tubing groups (THER), and a control (CTRL) group. Ten weeks of training were undertaken and pre-and post isometric strength testing for all groups was performed on the MCU. Comparisons between the three groups were made using a Kruskal-Wallis test and effect sizes between the MCU and the THER groups and the THER and CTRL groups were also calculated. Results The MCU group displayed the greatest increase in isometric strength (flexion 64.4%, extension 62.9%, left lateral flexion 53.3%, right lateral flexion 49.1%) and differences were only statistically significant (p<0.05) when compared to the CTRL group. Increases in neck strength for the THER group were lower than that shown in the MCU group (flexion 42.0%, extension 29.9%, left lateral flexion 26.7%, right lateral flexion 24.1%). Moderate to large effect sizes were found between the MCU and THER as well as the THER and CTRL groups. Conclusions This study demonstrated that the MCU was the most effective training modality to increase isometric cervical muscle strength. Thera-Band tubing did however, produce moderate gains in isometric neck strength

Simulation blocks for TOSSIM-T2

We develop several hardware and software simulation blocks for the TinyOS-2 (TOSSIM-T2) simulator. The choice of simulated hardware platform is the popular MICA2 mote. While the hardware simulation elements comprise of radio and external flash memory, the software blocks include an environment noise model, packet delivery model and an energy estimator block for the complete system. The hardware radio block uses the software environment noise model to sample the noise floor. The packet delivery model is built by establishing the SNR-PRR curve for the MICA2 system. The energy estimator block models energy consumption by Micro Controller Unit(MCU), Radio, LEDs, and external flash memory. Using the manufacturerpsilas data sheets we provide an estimate of the energy consumed by the hardware during transmission, reception and also track several of the MCUs states with the associated energy consumption. To study the effectiveness of this work, we take a case study of a paper presented in [1]. We obtain three sets of results for energy consumption through mathematical analysis, simulation using the blocks built into PowerTossim-T2 and finally laboratory measurements. Since there is a significant match between these result sets, we propose our blocks for T2 community to effectively test their application energy requirements and node life times.

Simulation Blocks for TOSSIM-T2"

We develop several hardware and software simulation blocks for the TinyOS-2 (TOSSIM-T2) simulator. The choice of simulated hardware platform is the popular MICA2 mote. While the hardware simulation elements comprise of radio and external flash memory, the software blocks include an environment noise model, packet delivery model and an energy estimator block for the complete system. The hardware radio block uses the software environment noise model to sample the noise floor.The packet delivery model is built by establishing the SNR-PRR curve for the MICA2 system. The energy estimator block models energy consumption by Micro Controller Unit(MCU), Radio,LEDs, and external flash memory. Using the manufacturer’s data sheets we provide an estimate of the energy consumed by the hardware during transmission, reception and also track several of the MCUs states with the associated energy consumption. To study the effectiveness of this work, we take a case study of a paper presented in [1]. We obtain three sets of results for energy consumption through mathematical analysis, simulation using the blocks built into PowerTossim-T2 and finally laboratory measurements. Since there is a significant match between these result sets, we propose our blocks for T2 community to effectively test their application energy requirements and node life times.

H桥斩波电源的小信号数学模型及其数字化控制器的实现

A brief summary of H bridge non-isolated DC-DC converter and operation principles is presented in this paper. A small signal model of the ideal converter in continuous current mode is proposed and simulation results of the converter are given. The hardware structure of digital power supply controller based on TMS320F2808 MCU is introduced. 中文摘要：概括了加速器 H 桥非隔离式电源的运行原理与特点，在简化运行方式基础上建立了理想状态下电源连续工作模式的数学模型，并给出了仿真分析结果，介绍了基于 TMS320F2808MCU 实现的数字化电源控制器结构。

AD7690在高精度数字电源上的应用

This paper contains the performance , principles of AD7690 and application design based on TMS320F2808 MCU. AD7690 ’s characters of high speed and high precision satisfy the requirement s of accelerator digital power supply.中文摘要：介绍了 AD7690 的主要性能、 工作原理 ,给出了应用电路以及在 TMS320F2808 上的数字接口设计。AD7690 的高速、 高精度特点适合加速器高精度数字电源方案。

基于新技术的超导电源及失超保护装置研究与设计

超导磁铁以其能实现极高的磁场强度和较低的能量损耗的优势，正在迅速成为现代加速器系统中普遍采用的一项技术。为超导磁体提供励磁的超导电源也就成为了必需研究的课题。此外，与之相似的低压大电流电源也大量的应用于加速器系统中，服务于核物理研究工作。针对这类电源在加速器中的应用，本课题的主要挑战在于如何实现一种高效率和低纹波输出特性的电源。为此，本论文的作者采用了一种完全不同的拓扑结构“多路多相同步整流BUCK变换器”，来达到高效率和低纹波的目标。并尝试使用数字技术来实现控制单元。本论文首先详细介绍了“多路多相同步整流BUCK变换器”的拓扑，通过计算和推导介绍了这种拓扑是如何提高效率和减少纹波电流输出的。然后介绍了这种拓扑结构所必需解决的均流问题、其产生原因和解决办法：一种几乎无损的单路电流的测量方法，以及这种测量方法的原理和实现方法。之后介绍了整个电源的参数计算和PCB板设计的一些细节。最后详细介绍了用MCU实现的控制器的设计细节。作为超导电源必配的失超保护装置，它担负着在失超故障状态，将超导磁体内存储的能量在尽量短的时间内消耗在外部负载上，以用于实现保护超导磁体的功能。因此超导磁铁失超保护装置 的设计原则是：可靠性和经济性。本论文最后一部分详细介绍了按照这个目标设计的超导磁铁失超保护装置及其设计细节

基于USB接口的无线温湿度监测系统

针对环境温湿度检测的需求,设计了一种点对多点的星型无线温湿度监控网络。以无线通信模块nRF401为基础,配合AT89C2051和数字温湿度传感器SHT11构建了从机,以P89C51RD2BN单片机和USB接口芯片PDIUSBD12构建了主机。对系统的硬件原理及温湿度采集方法进行了介绍,对无线通信协议及USB固件设计方法进行了较详细分析。经上位机软件测试,系统运行稳定,具有较好实用性,可应用于多种场合的无线温湿度监测。

PROFIBUS-DP从站通信控制器的设计与实现

PROFIBUS是一种国际化、开放式、不依赖于设备生产厂商的现场总线标准，PROFIBUS-DP作为PROFIBUS的一个分支，以其成熟性、实时性、可靠性和稳定性，在全球范围内的工业自动化领域获得了最为广泛的应用。PROFIBUS-DP协议比较复杂, 目前只有少数国外厂商提供专用的PROFIBUS-DP协议芯片，而国内对于PROFIBUS-DP总线的应用基本以购买国外自动化设备厂商的PROFIBUS-DP通信芯片为主，导致我国的自动化行业难以掌握核心技术。因此研究和开发具有自主知识产权的PROFIBUS-DP通信芯片具有广阔的前景和重要的意义。本文通过深入研究PROFIBUS-DP协议，提出了一套完整的设计方案，并设计出符合PROFIBUS-DP协议的IP核，为最终PROFIBUS-DP通信芯片的实现打下了坚实的基础。 本文详细的介绍了PROFIBUS-DP从站通信控制器的设计实现过程。首先通过分析PROFIBUS-DP协议以及参考国外现有的芯片资料，结合自身研究，提出了PROFIBUS-DP从站通信控制器的整体设计方案，给出了设计的整体框图；其次在整体设计方案的基础上详细介绍了各个功能模块的实现方法，以此为基础，采用自顶向下的设计方法，对各个模块进行详细的设计，并给出了Verilog语言实现RTL编码以及核心功能模块的仿真波形图；最后采用ALTERA公司的Cyclone EP1C6 的FPGA芯片和Philips公司的P89LV51RD2 MCU搭建了一个标准化的智能型从站，并采用ProfiCore和ProfiScrit搭建了PROFIBUS-DP从站控制器的系统级验证环境，进行了系统级验证，充分证实了设计方案的可行性。

PROFIBUS PA通信协议软件开发

随着控制技术、计算机技术、通信技术的飞速发展，现场总线技术正逐渐取代集散控制技术。PROFIBUS现场总线技术作为应用最为广泛的现场总线技术之一，截止至2008年8月，其安装节点已经超过2500万个，市场份额超过20%。 本文首先深入研究了现场总线国际标准IEC61158-Type3(PROFIBUS标准)，分析了PFOFIBUS 现场总线的层次结构模型、各层功能及层间通信关系，然后介绍了PROFIBUS PA的功能块模型，包括块的构成、分类、参数详解，以及把功能块模型映射到模块化DP从站设备的规则等。然后本文采用uC/OS-II嵌入式实时操作系统作为软件平台，应用瑞萨公司M16C/62P系列MCU与中科院沈阳自动化研究所自主研发的FBC0409现场总线通信控制器作为硬件平台，开发了支持PROFIBUS DPV0和DP V1的通信协议栈，并根据PA应用行规(V3.01)编写了相应的功能块程序，并且进行了验证。 本文给出了PROFIBUS DPV0、DPV1实现过程中的主要数据和功能定义，介绍了各层任务的创建初始化，处理过程，绘制了相关的软件流程图。本文给出了编写物理块、功能块、变换块和设备管理的参数定义和读写函数的方法。