移动互联网中一种移动学习方案的设计与原型实现

以移动教育方面的三方应用场景为例,设计并实现了一个面向精品课程和开放课程的移动学习系统原型,实现了网络教学资源整合。根据现行主流移动智能终端的特点,针对触摸屏移动智能终端因误操作引起的计算资源和通信资源浪费现象,给出了一个有三方参与的应用系统场景中,可行的减少误操作的应用方法。通过使用确定型有限自动机的方法验证了系统的正确性。测试表明,该方法可以有效降低应用场景中代理服务模块和资源服务模块的工作压力,提高用户体验度。     

移动支付安全性问题研究

移动支付是允许移动用户利用无线通信技术,使用其移动终端对所消费的商品或服务进行账务支付的一种服务方式。在移动电子商务迅速抢占市场的同时,作为移动电子商务重要组成部分的移动支付近年来发展如火如荼。本文通过对移动支付相关概念的介绍,分析了目前移动支付存在的安全问题,提出了一些解决办法。     

Adaptive Motion/Force Tracking Control for a Class of Mobile Manipulators

In this paper, modeling and adaptive motion/force tracking control is considered for a class of mobile manipulators under the holonomic and affine constraints with the presence of uncertainties and disturbances. Based on a suitable reduced dynamic model, adaptive controllers are proposed to ensure that the states of a closed‐loop system asymptotically track desired trajectories while the constraint force remains bounded by tuning design parameters. Detailed simulation results confirm the effectiveness of the control strategy.     

嵌入式Web控制终端的物联网移动E-Laboratory平台

为了进一步提高大学校园设备资源的利用率,实现多种实验装置的网络化控制和用户终端移动化,基于物联网技术,将LAMP移植到采用ARM架构的微处理器上,通过搭建嵌入式Web控制终端,对Web服务平台进行了详细的设计,实现了多种实验装置的网络化控制;将单自由度机械臂系统这一实验装置与EWC_T连接,基于Android操作系统上开发了一个应用,设计并搭建了Mobile Experiment系统,实现了网络化实验室平台的用户终端的移动化;通过实验证明该系统能够可靠地完成对实验装置的远程控制,并具有低功耗、低成本和便携性好等优点。     

移动干扰源双星TDOA/FDOA定位方法研究

为准确给出移动干扰源的位置与速度,依据多普勒频移原理分别计算了干扰源经主星、邻星链路到达观测站的频率,并由此给出了频率差(FDOA)与时间差(TDOA)表达式,利用FDOA、TDOA表达式以及移动干扰源的位置关系建立了移动干扰源双星定位模型。利用最小二乘法给出了模型计算方法与步骤,最后通过实例计算验证了模型的有效性。     

Switched visual servo control of nonholonomic mobile robots with field-of-view constraints based on homography

This paper presents a novel scheme for visual servoing of a nonholonomic mobile robot equipped with a monocular camera in consideration of field-of-view (FOV) constraints. In order to loosen the FOV constraints, the system states are expressed by the homography between the current frame and the key frame so that the target is not necessarily to be always visible in the control process. A switched visual controller is designed to deal with the nonholonomic constraints. Moreover, an iteration strategy is used to eliminate errors caused by the parameter uncertainty. The stablity and robustness of the proposed scheme are guaranteed by theoretical analysis. Compared to conventional schemes, the proposed approach has the following advantages: 1) a better path in Cartesian space can be achieved owing to the loosening of FOV constraints; 2) the iteration strategy ensures the robustness to parameter uncertainty; 3) when used in landmark-based navigation, it needs much sparser and simpler landmarks than those localization-based approaches need. Simulation results demonstrate the effectiveness of the proposed method.     

HTML5移动web应用技术实现分析

与Native应用相比,移动web应用能很好地解决目前Native操作系统割裂的问题,将为产业链各方带来全新的平等竞争机会,引导移动互联网产业链的新模式发展。本文首先介绍了HTML5移动web应用的发展概况,然后分析了基于HTML5移动web应用相关技术标准的发展情况,随后对基于HTML5的移动web应用及终端的技术实现方案进行了分析,最后对全文内容进行了总结,从HTML5移动web应用、技术标准及终端的发展趋势进行了展望。     

基于BLP模型的摆渡木马防御技术的研究

分析了摆渡木马的工作原理和特点,提出了控制数据从计算机流向移动存储介质的解决方法。根据BLP模型的基本思想,提出了基于BLP模型的摆渡木马防御方案。在该方案中,根据内网或计算机中文件的重要程度,将文件分成不同等级;将用户对文件的访问权限也分成相应的不同等级;当用户对文件进行访问时,通过比较权限等级和文件等级来决定是否能读或写,读或写采用＂下读上写＂的策略。由于把移动存储介质的级别设为最低,所以该方案能有效的防止摆渡木马。     

Protecting Business Secrets in an EDI/CALS Environment

ABSTRACT

Communicating with confidential data requires special attention in a mobile agents environment, especially when the other hosts must be prevented from eavesdropping on the communication. We propose a communication model for secured communication between the agents belonging to publishers and consumers data. Confidentiality is ensured using our on-the-fly encryption-decryption sequence using ElGamal system to directly convert the message or plaintext into one that is encrypted directly with the public key of consumer. The scheme ensures that the data possessed by the agents is secured at all times when it is executing at any untrusted host. Our minimal implementation of the model with Aglets agent platform gives the first faithful picture of the happenings in the model. Finally, we also explain how the homomorphic property of ElGamal scheme can be integrated with our model for a Web-based application such as voting involving multiple agents.     

移动终端交通动态图形化信息受信位置研究

交通动态信息图形化发布是通过对道路网抽象简化形成简易道路图形,并在此基础上发布实时路况的交通信息发布方式。在移动终端上发布图形化动态信息时,应充分考虑移动终端的可移动性以及实时在线特性,在关键的位置发布合理的图形信息,才可提高交通动态信息的识别度和提升信息诱导效果。通过分析驾驶人信息接收过程和线路的调整行为特性,研究图形化数据受信距离的设置方法,建立受信距离计算模型,给出了模型关键参数的计算方法和参考数据,从而为后期规模性图形化发布位置的布设奠定基础。