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BI-directional

  • Abstract - A fl exible multiscale and directional representation for images is proposed. The s

    Abstract - A fl exible multiscale and directional representation for images is proposed. The scheme combines directional fi lter banks with the Laplacian pyramid to provides a sparse representation for two- dimensional piecewise smooth signals resembling images. The underlying expansion is a frame and can be designed to be a tight frame. Pyramidal directional fi lter banks provide an effective method to implement the digital curvelet transform. The regularity issue of the iterated fi lters in the directional fi lter bank is examined.

    标签: representation directional multiscale Abstract

    上传时间: 2013-12-15

    上传用户:zxc23456789

  • Bi-density twin support vector machines

    In this paper we present a classifier called bi-density twin support vector machines (BDTWSVMs) for data classification. In the training stage, BDTWSVMs first compute the relative density degrees for all training points using the intra-class graph whose weights are determined by a local scaling heuristic strategy, then optimize a pair of nonparallel hyperplanes through two smaller sized support vector machine (SVM)-typed problems. In the prediction stage, BDTWSVMs assign to the class label depending on the kernel density degree-based distances from each test point to the two hyperplanes. BDTWSVMs not only inherit good properties from twin support vector machines (TWSVMs) but also give good description for data points. The experimental results on toy as well as publicly available datasets indicate that BDTWSVMs compare favorably with classical SVMs and TWSVMs in terms of generalization

    标签: recognition Bi-density machines support pattern vector twin for

    上传时间: 2019-06-09

    上传用户:lyaiqing

  • Tableau:数据可视化之极速BI

    Tableau:数据可视化之极速BI,书籍及释义

    标签: Tableau 数据 可视化

    上传时间: 2020-05-11

    上传用户:starnny

  • 基于TMS320F2808的高效双向DCDC变换器.rar

    双向DC/DC变换器(BI-directionalDC/DCconverters)是能够根据需要调节能量双向传输的直流/直流变换器。随着科技的发展,双向DC/DC变换器的应用需求越来越多,正逐步应用到无轨电车、地铁、列车、电动车等直流电机驱动系统,直流不间断电源系统,航天电源等场合。一方面,双向DC/DC变换器为这些系统提供能量,另一方面,又使可回收能量反向给供电端充电,从而节约能量。 大多数双向DC/DC变换器采用复杂的辅助网络来实现软开关技术,本文所研究的Buck/Boost双向的DC/DC变换器从拓扑上解决器件软开关的问题;由于Buck/Boost双向DC/DC变换器的电流纹波较大,这会带来严重的电磁干扰,本文结合Buck/Boost双向DC/DC变换器拓扑与磁耦合技术使电感电流纹波减小;由于在同一频率下不同负载时电流纹波不同,本文在控制时根据负载改变PWM频率,从而使轻载时的电流纹波均较小。 本文所研究的双向DC/DC变换器采用DSP处理器进行控制,其原因在于:目前没有专门用于控制该Buck/Boost双向DC/DC变换器的控制芯片,而DSP具有多路的高分辨率PWM,通过对DSP寄存器的配置可以实现Buck/Boost双向DC/DC变换器的控制PWM;DSP具有多路高速的A/D转换接口,并可以通过配合PWM完成对反馈采样,具备一定的滤波功能。 本文所研究的数字双向DC/DC变换器实现了在Buck模式下功率MOSFET的零电压开通及零电压关断,电感电流的交迭使其电感输出端电流纹波明显变小,轻载时PWM频率的提升也使得电流纹波变小。

    标签: F2808 2808 320F DCDC

    上传时间: 2013-06-08

    上传用户:cy_ewhat

  • FET430PIF自制资料

    The MSP-FET430PIF is a Parallel Port interface (does not include target board) that is used to program and debug MSP430 FET tools and test boards through the JTAG interface. This interface is included in our FET tools, but sold without the development board. This interface uses a Parallel PC Port to communicate to the Debugger Software (IAR Kickstart software included) running on the PC. The interface uses the standard 14 pin header to communicate to the MSP430 device using the standard JTAG protocol. The flash memory can be erased and programmed in seconds with only a few keystrokes, and since the MSP430 flash is extremely low power, no external power supply is required. The tool has an integrated software environment and connects directly to the PC which greatly simplifies the set-up and use of the tool. The flash development tool supports development with all MSP430 flash parts. Features MSP430 debugging interface to connect a MSP430-Flash-device to a Parallel port on a PC Supports JTAG debug protocol (NO support for Spy-Bi-Wire (2-wire JTAG) debug protocol, Spy-Bi-Wire (2-wire JTAG) is supported by MSP-FET430UIF) Parallel Port cable and a 14-conductor target cable Full documentation on CD ROM Integrated IAR Kickstart user interface which includes: Assembler Linker Limulator Source-level debugger Limited C-compiler Technical specifications: Backwardly compatable with existing FET tool boards.

    标签: FET 430 PIF

    上传时间: 2013-10-26

    上传用户:fengweihao158@163.com

  • MSP430 USB JTAG自制资料

    The MSP-FET430U14 is a powerful flash emulation tool to quickly begin application development on the MSP430 MCU. It includes USB debugging interface used to program and debug the MSP430 in-system through the JTAG interface or the pin saving Spy Bi-Wire (2-wire JTAG) protocol. The flash memory can be erased and programmed in seconds with only a few keystrokes, and since the MSP430 flash is ultra-low power, no external power supply is required. The debugging tool interfaces the MSP430 to the included integrated software environment and includes code to start your design immediately.  The MSP-FET430UIF development tools supports development with all MSP430 flash devices

    标签: JTAG MSP 430 USB

    上传时间: 2013-10-28

    上传用户:13691535575

  • arm指令集(1)

    arm指令集(1)  ARM跳转指令可以从当前指令向前或向后的32MB地址空间跳转。这类跳转指令有以下4种。   (1)B 跳4专指令   B〔条件) (地址)   B指令属于ARM指令集,是最简单的分支指令。一旦遇到一个B指令,ARM处理器将立即跳转到给定的地址,从那里继续执行。注意:存储在分支指令中的实际值是相对当前R15的值的一个偏移量,而不是一个绝对地址。它的值由汇编器来计算,是24位有符号数,左移两位后有符号扩展为32位,表示的有效偏移位为26位(+/- 32 MB)。   (2)BL 带返回的跳转指令   BI,〔条件) (地址)   BL指令也属于ARM指令集,是另一个分支指令。就在分支之前,在寄存器R14中装载上R15的内容,因此可以重新装载R14到R15中来返回到这个分支之后的那个指令处执行,它是子例程的一个基本但强力的实现。   (3)BLX 带返回和状态切换的跳转指令   BLX <地址>   BLX指令有两种格式,第1种格式的BLX指令记作BLX(1)。BLX(1)从ARM指令集跳转到指令中指定的目标地址,并将程序状态切换到Thumb状态,该指令同时将PC寄存器的内容复制到LR寄存器中。   BLX(1)指令属于无条件执行的指令。   第2种格式的BLX指令记作BLX(2)。BLX(2)指令从ARM指令集跳转到指令中指定的目标地址,目标地址的指令可以是ARM指令,也可以是Thumb指令。目标地址放在指令中的寄存器<dest>中,该地址的bit[0]值为0,目标地址处的指令类型由CPSR中的T位决定。该指令同时将PC寄存器的内容复制到LR寄存器中。   (4)BX 带状态切换的跳转指令   BX(条件) (dest)   BX指令跳转到指令中指定的目标地址,目标地址处的指令可以是ARM指令,也可以是Thumb指令。目标地址值为指令的值和0xFl·FFFFFF做“与”操作的结果,目标地址处的指令类型由寄存器决定。

    标签: arm 指令集

    上传时间: 2014-12-27

    上传用户:laomv123

  • 亚惠快餐管理信息系统 包括亚惠快餐管理的各项功能

    亚惠快餐管理信息系统 包括亚惠快餐管理的各项功能,含BI分析

    标签: 管理信息系统

    上传时间: 2013-12-19

    上传用户:gxf2016

  • 电力系统在台稳定计算式电力系统不正常运行方式的一种计算。它的任务是已知电力系统某一正常运行状态和受到某种扰动

    电力系统在台稳定计算式电力系统不正常运行方式的一种计算。它的任务是已知电力系统某一正常运行状态和受到某种扰动,计算电力系统所有发电机能否同步运行 1运行说明: 请输入初始功率S0,形如a+bi 请输入无限大系统母线电压V0 请输入系统等值电抗矩阵B 矩阵B有以下元素组成的行矩阵 1正常运行时的系统直轴等值电抗Xd 2故障运行时的系统直轴等值电抗X d 3故障切除后的系统直轴等值电抗 请输入惯性时间常数Tj 请输入时段数N 请输入哪个时段发生故障Ni 请输入每时段间隔的时间dt

    标签: 电力系统 计算 运行

    上传时间: 2015-06-13

    上传用户:it男一枚

  • 电力系统静态稳定计算一般采用小干扰法

    电力系统静态稳定计算一般采用小干扰法,即首先计算近似的线性微分方程组系数矩阵的特征根。然后根据特征根在复平面上的特性,判别电力系统运行的稳定性 操作说明: 请输入初始功率S0,形如a+bi 请输入无限大系统母线电压V0 请输入系统直轴等值电抗的大小Xd 请输入同步电角速度 请输入惯性时间常数Tj 请输入综合阻尼系数D

    标签: 电力系统 干扰 计算

    上传时间: 2013-12-17

    上传用户:zhengzg