基于Android的家庭移动医疗监护系统的设计

老年人口数量快速增加和慢性疾病病发率、死亡率的上升给传统医疗体系带来了巨大压力,因此,新型医疗体系越来越受到全社会的关注。结合穿戴式传感检测技术和无线Wi-Fi技术,设计了家庭移动医疗监护系统,在系统中,开发了一种家用、便携生理参数监护仪,采用Java语言依托Eclipse开发环境在Android智能手机平台上开发了监护仪客户端,在PC机上搭建了远端服务器。Android手机能够接收监护仪采集的生理数据,实时监测显示血压、心率、心电图等,通过智能手机可以把生理数据上传至远端服务器,实现数据的保存和查询。本设计所采用的方法为面向家庭、社区、医院的新型家用便携、可移动的医疗仪器以及远程医疗监护系统提供关键的技术和设备基础。     

Modeling of Drug Release from a Novel Temperature-Responsive Phase-Transient Drug Delivery System in Cylindrical Coordinates

In this study, a novel phase-transient multilayer drug delivery system responsive to a unique stimulus, i.e., temperature, was introduced in cylindrical coordinates. The system is composed of three individual sections, including the drug core, phase-transient intermediate layer, and protecting polymeric coverage. The phase-transient layer gives smartness to the system and creates an “On-Off” release profile with increasing or decreasing the environmental temperature around the melting point of the layer. The “On-Off” response of the system was mathematically modeled by analyzing the heat and mass transfer equations in the pseudo-steady state and the effects of various parameters on the performance of the system were investigated. The modeling results showed the intensity of the effects of different kinds of factors, including the geometrical characteristics of the system (e.g., the radius of the drug core and the thicknesses of the intermediate and polymeric layers), the physical properties of the matrix materials (e.g., the thermal conductivities and diffusion coefficients of the intermediate and polymeric layers), and the operation conditions, on the response time lag and release kinetics of the presented system. The obtained results in this study predict methods to prepare multilayer temperature-responsive drug delivery systems with desired and optimized responses (e.g., with a short lag time) for practical biomedical applications.     

基于多目标双层规划的智能电网虚假数据注入攻击研究

相对于传统电网,智能电网引入了先进的信息通信技术能显著提高企业生产效率和电力数据处理效率,但由于传统状态估计的漏洞,智能电网易受到虚假数据注入的攻击。现有的研究仅追求电力系统运营成本的最大化或攻击资源的最小化,没有考虑两者之间的均衡。基于此,本文考虑建立智能电网虚假数据注入攻击双层多目标规划模型,其中多目标表示电力系统运营成本与攻击成本之间的均衡,并结合IEEE 14总线算例进行分析,针对攻击者不同的攻击倾向给出了相应的虚假数据注入攻击策略。     

旋转功能梯度智能结构的刚-柔耦合动力学分析

基于一次耦合模型理论建立了中心刚体-压电层-功能梯度材料智能梁系统的刚柔耦合动力学模型．研究了开环状态下将压电材料作为传感器的压电效应和质量刚度效应对系统动力学特性的影响．通过仿真算例与另两种不同建模理论（传统零次近似耦合模型、一次近似耦合模型）作了对比．随着中心刚体外驱动力矩的增大,零次近似耦合模型和一次近似耦合模型计算结果逐渐发散,而本文的一次耦合模型的计算结果始终保持收敛,较其他近似耦合模型具有一定优势．对三种不同的结构的计算结果表明,压电材料的压电效应对系统的动力学特性影响显著,压电材料的质量刚度效应也会影响智能梁的动力学行为,前者比后者的影响大得多．此外,功能梯度材料功能梯度指数对系统动力学特性的影响也较大．     

基于IIC和云服务器的智能家居控制系统设计

智能家居普遍采用无线通信技术对家居进行互联,不同的通信方法对智能家居系统的稳定性、便捷性、可靠性有很大的影响;针对智能家居的访问方式,通过对比不同的无线通信技术,选择合适的技术运用在智能家居系统的设计中,实现局域网和广域网两种访问方式;在无线传输的智能家居基础上,使用IIC总线进行功能扩展,使用云服务器来替代传统计算机服务器,增加了系统的灵活性和手机访问的快捷性,更好地实现家庭住宅管理与监测,为我们平时的生活提供便利和保护。     

Implementation of a Biometric Interface in Voice Controlled Wheelchairs

In order to assist physically handicapped persons in their movements, we developed an embedded isolated word speech recognition system (ASR) applied to voice control of smart wheelchairs. However, in spite of the existence in the industrial market of several kinds of electric wheelchairs, the problem remains the need to manually control this device by hand via joystick; which limits their use especially by people with severe disabilities. Thus, a significant number of disabled people cannot use a standard electric wheelchair or drive it with difficulty. The proposed solution is to use the voice to control and drive the wheelchair instead of classical joysticks. The intelligent chair is equipped with an obstacle detection system consisting of ultrasonic sensors, a moving navigation algorithm and a speech acquisition and recognition module for voice control embedded in a DSP card. The ASR architecture consists of two main modules. The first one is the speech parameterization module (features extraction) and the second module is the classifier which identifies the speech and generates the control word to motors power unit. The training and recognition phases are based on Hidden Markov Models (HMM), K-means, Baum-Welch and Viterbi algorithms. The database consists of 39 isolated speaker words (13 words pronounced 3 times under different environments and conditions). The simulations are tested under Matlab environment and the real-time implementation is performed by C language with code composer studio embedded in a TMS 320 C6416 DSP kit. The results and experiments obtained gave promising recognition ratio and accuracy around 99% in clean environment. However, the system accuracy decreases considerably in noisy environments, especially for SNR values below 5 dB (in street: 78%, in factory: 52%).     

一类快速易行的智能卡认证协议

基于单向 Ｈ Ａ Ｓ Ｈ 函数的快速和单向性,构造了一个适合于智能卡实现的认证协议,该协议完全性好,且较之于其定的智能卡认证协议要更快速更快速和便于实现,并可实现双向认证     

基于Windows Mobile平台的产品管理软件的设计与开发

分析了基于Windows Mobile平台的维吾尔文产品管理系统,着重研究Windows Mobile的应用开发及维吾尔文的书写特点、手机输入法设计中的难点与不等宽问题．设计实现了具有不同编辑方向的维、汉、英、多语种智能手机的混合输入和屏幕显示．在基于.NET compact Framework的智能设备开发框架下,使用Pocket outlook对象模型,实现了客户的便捷通讯功能．在系统的设计和实现过程中,引入Windows Mobile技术和SQL Server Mobile数据库技术来解决相关数据的存储和处理问题．     

用于结构健康监测的智能夹层研究进展

利用改进的柔性印刷电路技术,把一个分布式传感器/驱动器网络预先复合到一片绝缘载体膜上形成薄层,再结合相应的信号控制和处理软件,这就是当前先进的智能夹层(SMARTLayer)技术。结构健康监测(SHM)系统中智能夹层的提出及发展,将有可能把目前广泛采用的离线、静态、被动的材料及结构的损伤检测,转变为在线、动态、实时的健康监测,从而导致工程结构及材料安全监测与性能改善思路产生质的飞跃,引起结构及材料设计思想的变革。在本文中,主要阐述了智能夹层的发展、特点、关键技术、部件、相关的数据处理和应用情况,以及对今后的发展提出了一些需要注意解决的问题。在研究中,我们发现嵌入到玻璃纤维复合材料中的智能夹层对工程材料基体的力学性能没有产生明显的影响,并且自身的电学性能也非常稳定。     

面向压电智能结构精确变形的协同优化设计方法

智能结构集智能材料与传统材料于一体,能够实现结构的主动控制,在航空航天等领域具有巨大的应用潜力.由于其系统复杂且具有多场耦合效应,智能结构的整体式优化设计方法成为结构控制技术研究的关键之一.为了提高压电智能结构的整体性能和变形精度,提出了同时考虑压电驱动器布局(分布位置及角度)和基体结构拓扑构型的协同优化设计新方法.采用多点约束方法 (multi-point constraints,MPC)建立压电驱动器和基体结构的连接,定义一种与测量点目标位移相关的权重函数,以实现结构的精确变形控制.通过协同优化设计,压电驱动器可以获得最优的分布位置及角度,同时基体结构获得最优的拓扑构型,从而提升了压电智能结构系统的整体驱动性能和变形精度.通过进一步分析,研究了精确变形、体分比约束与结构优化构型和整体刚度的关系,以及优化结果中可能存在的传力路径畸变现象.数值算例的设计结果表明,采用协同优化设计方法,能够扩大结构的寻优空间,有效减小变形误差,实现压电智能结构的精确变形控制.