光通信设备手持式管理终端显示驱动研究及实现

μC/GUI是一种被广泛应用于手持设备显示屏的嵌入式图形界面开发软件.本文在分析μC/GUI层次结构基础上,讨论了在基于LPC2478处理器与24位色LCD的硬件平台上移植μC/GUI软件的过程.其中详细介绍了基于某型光端机的手持管理终端硬件环境下驱动程序的编写方法,配置μC/GUI头文件的方法;描述了修改μC/GuI...     

低功耗无线传感器网络节点设计与实现

本文设计并实现了低功耗无线传感器网络节点.首先分析比较了现有的各种节点设计方案,选取低功耗芯片,设计了基于MSP430F149处理器和nRF24L01+无线收发芯片的低功耗节点设计方案,并提出了低功耗能量管理策略,最后对节点的能量消耗进行了仔细测试和分析.实验结果表明,提出的节点设计方案和能量管理策略能够实现节点的低功耗工作.     

基于RF微功率芯片的测温系统设计

详细阐述了利用无线收发芯片nRF24E1设计的数据传输系统的硬件和软件设计,给出了具体的实现方案。系统以嵌入51单片机内核的单片射频收发芯片nRF24E1为核心,将传感器采集的数据通过无线收发模块向手机传输,并在手机上正确的显示出来,供用户监控,从而在用户端能随时监控厂房的各种数据,减少布线的麻烦。     

通信泄漏同轴电缆参数的优化及性能研究

研究了遗传算法对通信泄漏同轴电缆进行结构参数优化的方法,分析了漏缆的耦合损耗,并将仿真结果与理论计算结果进行了对照。文中对工作频率为800MHz的周期开槽漏缆进行了优化,使其95%置信度耦合损耗达到70dB,电压驻波比达到1.1。在此基础上比较了在自由空间和靠近理想导体时漏缆的辐射场,分析了置于金属壁附近时导电壁对漏缆耦合损耗的影响。文中研究结果对泄漏同轴电缆的设计和应用有一定参考价值。     

基于nRF24L01的矿用搜救器设计

本设计是基于无线收发芯片nRF24L01的矿用搜救器的解决方案,用于以2.4GHz工业无线通信组成的煤矿井下人员定位系统。该设计方案采用STM32F103VE芯片做主控制器,以2.4GHz工业无线通信为基础,为煤矿安全生产提高保障。     

Decay rate estimations for linear quadratic optimal regulators

Let u(t)=−Fx(t)$u(t)=-Fx(t)$ be the optimal control of the open-loop system x^′(t)=Ax(t)+Bu(t)$x^{\prime }(t)=Ax(t)+Bu(t)$ in a linear quadratic optimization problem. By using different complex variable arguments, we give several lower and upper estimates of the exponential decay rate of the closed-loop system x^′(t)=(A−BF)x(t)$x^{\prime }(t)=(A-BF)x(t)$. Main attention is given to the case of a skew-Hermitian matrix A. Given an operator A, for a class of cases, we find a matrix B that provides an almost optimal decay rate.     

Continuous time trading of a small investor in a limit order market

We provide a mathematical framework to model continuous time trading of a small investor in limit order markets. We show how elementary strategies can be extended in a suitable way to general continuous time strategies containing orders with infinitely many different limit prices. The general limit buy order strategies are predictable processes with values in the set of nonincreasing demand functions. It turns out that our strategy set of limit and market orders is closed, but limit orders can turn into market orders when passing to the limit, and any element can be approximated by a sequence of elementary strategies.     

On Approximate Efficiency in Multiobjective Programming

This paper is focused on approximate ( -efficient) solutions of multiobjective mathematical programs. We introduce a new -efficiency concept which extends and unifies different notions of approximate solution defined in the literature. We characterize these -efficient solutions in convex multiobjective programs through approximate solutions of linear scalarizations, which allow us to obtain parametric representations of different -efficiency sets. Several classical -efficiency notions are considered in order to show the concepts introduced and the results obtained.This research was partially supported by Ministerio de Ciencia y Tecnología (Spain), project BFM2003-02194.