基于DSDV的无线Mesh网络跨层路由设计

在DSDV协议的基础上,提出一种跨层路由设计的方法,选择一条具有合理长度和最小重传概率的路由进行测试。该链路质量机制可应用到基于IEEE802.11x的无线Mesh网络中,无须对现有的MAC层进行修改,即可作为一个单独模块加入到现有协议。在多跳网络中使用该跨层方案进行路由选择,能节省系统开销,优化系统的整体性能。     

基于JavaEE的电信CRM数据持久层的实现

结合中国电信行业信息化建设的实际需求,引入JavaEE架构体系,提出一种在JavaEE平台上开发大型电信客户关系管理数据持久层的方法。通过门面模式、VO模式和DAO模式在SpringJDBC架构中的应用,实现持久层之间的松散耦合,使整个系统具备良好的稳定性、可伸缩性和可扩展性。     

无线传感器网络MAC协议的研究与分析

针对不同的传感器网络应用,研究人员从不同方面提出多个无线传感器网络介质访问控制（MAC）协议,其中包括S-MAC,PMAC,DEANA,EMACs,Z—MAC以及AIMRP等协议。通过分析各类MAC典型协议特点,归纳其设计原则和分类方法,比较各协议间的性能差异,结果证明无线传感器网络MAC协议呈现多样性的特点,设计MAC协议需要兼顾能量效能和网络性能2个方面。给出MAC协议的设计策略。     

设计模式在民航信息平台中的应用

为了在面向服务设计中有效提高系统的灵活性、敏捷性,以民航综合信息平台为背景,使用设计模式构建面向服务的应用系统。针对民航综合信息平台的核心服务设计,提出服务接口和服务网关2种面向服务的设计模式,将其实现在应用系统中,以验证设计模式在面向服务系统设计中的有效性。     

飞行试验智能化工程测量系统

根据飞行试验需求,设计满足未来武器测试发展需求的高精度空间三维点、线、面一体化智能测量系统.该系统具备测量仿真、在线测量,快速处理、实时监控的功能.给出了系统建设思路、框架及系统的组成,并对关键技术问题进行了剖析,在试验室进行了平台搭建对算法功能进行了验证,并在飞机形变测量中进行了自动控制测量模式的应用,取得了良好的应用效果.     

基于AADL的航电构型控制系统的建模分析

针对航电系统的不同构型仿真、系统加改装的验证,为了使构型控制系统可以根据应用需求可靠转换,以满足系统结构能够可靠重构的需求,采用先进的建模语言AADL(结构化分析设计语言)完成了对航电构型控制系统的建模设计。结合AADL对航电构型控制系统进行了详细的分析,展示了该系统的特征与关键技术,体现了此系统的工作原理与内部结构。该模型可以表达系统的功能与非功能约束,实现了系统级的组件建模策略,层次化地描述了系统的架构。     

Ergonomic design and evaluation of the handle for an endoscopic dissector

The purpose of this study was to design an endoscopic dissector handle and objectively assess its usability. The handles were designed with increased contact area between the fingers and thumb and the eye rings, and the eye rings were modified to have a more perpendicular insertion angle to the finger midline. Four different handle models were compared, including a conventional product. Subjects performed dissection, exclusion, grasping, precision manipulation and precision handling tasks. Electromyography and subjective evaluations were measured. Compared to conventional handles, the designated handle reduced the muscle load in the extensor and flexor muscles of the forearm and increased subjective stability. The activity of the first dorsal interosseous muscle was sometimes influenced by the shape of the other parts. The ergonomically designed endoscopic dissector handle used in this study achieved high usability. Medical instrument designs based on ergonomic concepts should be assessed with objective indices.

Practitioner Summary: The endoscopic dissector handles were designed with increased contact area and more suitable insertion angle between the fingers and thumb and the eye rings. Compared to conventional handles, the designated handle reduced the muscle load in the extensor and flexor muscles of the forearm and increased subjective stability.     

An observational comparison of the older and younger bus passenger experience in a developing world city

This study was an unobtrusive observational analysis of 333 older and younger bus passengers in Guadalajara, Mexico. A set of data were collected for each observed passenger, as well as more general observations related to driver behaviour, bus design and bus service characteristics. There were significant differences between older and younger passengers in terms of boarding and alighting times, use of handrails, seat location preferences, passenger stability and coping strategies in order to maintain postural stability. The conditions of travel are conducive to a poor passenger experience for the older passengers in particular. Although the problems may be attributed to bus design and driver behaviour typical of that in developing countries, they are also influenced by the wider transport infrastructure, and a lack of a regulatory regime which places drivers under time pressure and in direct competition with each other.

Practitioner Summary: Bus services must cater for all ages of passengers, including the elderly. This unobtrusive observational study investigated the passenger experience in a developing world city. Bus and wider service design were found to compromise the journey experience, with the older users being particularly negatively impacted. Design recommendations are provided.     

Adaptive neural control for an uncertain robotic manipulator with joint space constraints

In this paper, adaptive neural tracking control is proposed for a robotic manipulator with uncertainties in both manipulator dynamics and joint actuator dynamics. The manipulator joints are subject to inequality constraints, i.e., the joint angles are required to remain in some compact sets. Integral barrier Lyapunov functionals (iBLFs) are employed to address the joint space constraints directly without performing an additional mapping to the error space. Neural networks (NNs) are utilised to compensate for the unknown robot dynamics and external force. Adapting parameters are developed to estimate the unknown bounds on NN approximations. By the Lyapunov synthesis, the proposed control can guarantee the semi-global uniform ultimate boundedness of the closed-loop system, and the practical tracking of joint reference trajectory is achieved without the violation of predefined joint space constraints. Simulation results are given to validate the effectiveness of the proposed control scheme.     

Estimating parameters with pre-specified accuracies in distributed parameter systems using optimal experiment design

Estimation of physical parameters in dynamical systems driven by linear partial differential equations is an important problem. In this paper, we introduce the least costly experiment design framework for these systems. It enables parameter estimation with an accuracy that is specified by the experimenter prior to the identification experiment, while at the same time minimising the cost of the experiment. We show how to adapt the classical framework for these systems and take into account scaling and stability issues. We also introduce a progressive subdivision algorithm that further generalises the experiment design framework in the sense that it returns the lowest cost by finding the optimal input signal, and optimal sensor and actuator locations. Our methodology is then applied to a relevant problem in heat transfer studies: estimation of conductivity and diffusivity parameters in front-face experiments. We find good correspondence between numerical and theoretical results.