摘要：Several protocols and schemes have been proposed to reduce energy consumption in Wireless Sensor Net-works (WSNs). In this paper we employ farcoopt, a cross layer design approach with the concept of coop-eration among the nodes with best farthest neighbor scheme to increase the Quality of Service (QoS), reduce energy consumption, increases performance and end-to-end throughput. We present cooperative transmission to connect previously disconnect parts of a network thus overcoming the separation problem of multi-hop network. We show that this approach improves connectivity over 50% compared to multi-hop approaches and reduces the number of nodes necessary to provide full coverage of an area up to 35%. Simulation results show that on increase of data rates i.e. packet the network life time increases in farcoopt as compared to tra-ditional multi hop approach. The result of this analysis is presented in this work.

摘要：Photovoltaic (PV) systems have attracted increasing attention in last years as well as Wireless Sensor Networks (WSNs), which have been used in many application fields. In PV plants, especially in ground installations, a lot of thefts and damages occur due to the still high cost of the modules. A new experimental WSN ad-hoc has been designed to be an anti-theft alarm system. Each node of the network is directly installed under each PV string and it is equipped with an accelerometer sensor capable to detect a minimum displacement of the panel from its steady position. The WSN presents a star topology: a master node cyclically interrogates the slave nodes through RF link. It collects all the nodes responses and communicates though a RS-232 interface with a control PC checking the network status. When a slave node detects an alarm, continuous messages are sent to the control PC which turns on all the alarm signaling systems. The control PC is equipped with an open source operative system and software and provides for SMS, e-mail and sound-light signaling in case of alarm. It also communicates with a remote server where all the WSN information is stored. A first low cost experimental WSN has been already installed and it is working properly.

摘要：在分析典型的现有主动网系统的基础上,借鉴protocol Booster的设计思路,提出了一种新的面向实用网络环境的主动网执行环境模型．该模型在充分考虑性能(包处理效率)的基础上,采用类似protocol Booster的增量实现方法,易于扩展并且与现有网络完全兼容,并给出了在Linux平台下该模型的实现．

摘要：The need of communication protocols in today’s environment increases as much as the network explores. Many new kinds of protocols, e.g. for information sharing, security, etc., are being developed day-to-day which often leads to rapid, premature developments. Many protocols have not scaled to satisfy important properties like deadlock and livelock freedom, since MDA focuses on the rapid development rather than on the quality of the developed models. In order to fix the above, we introduce a 2-Phase strategy based on the UML state machine and sequence diagram. The state machine is converted into PROMELA code as a protocol model and its properties are derived from the sequence diagram as Linear Temporal Logic (LTL) through automation. The PROMELA code is interpreted through the SPIN model checker, which helps to simulate the behavior of protocol. Later the automated LTL properties are supplemented to the SPIN for the verification of protocol properties. The results are compared with the developed UML model and SPIN simulated model. Our test results impress the designer to verify the expected results with the system design and to identify the errors which are unnoticed during the design phase.

摘要：伴随航空和航天电子技术的飞速发展,传统总线已经不能满足新型航空及航天电子系统的技术总体设计需求,因此目前传统的总线技术正逐步被新一代航空数据总线技术所替代,目前国外新型的商业和军用航空航天项目中的电子系统采用的总线已经开始转向光纤通道( Fiber Channel,FC)、航空电子全双工交换式以太网( Avionics FullDuplex Switched Ethernet,AFDX)、SpaceWire、Time-triggered protocol ( TTP)和Time-triggered Ethernet ( TTE).新一代总线技术相比于传统的总线可以提供更高带宽、更高可靠性和低延迟性,能够很好地满足新一代航空航天电子系统的技术设计要求.

摘要：Urinary incontinence is the most common health problem in aged people. Leaving incontinence events unmanaged will make a negative influence on the aged and the patient both mentally and physically. This paper presents a design and implementation of a real time wireless monitor system for urinary incontinence, which has been applied in two nursing homes in Beijing and Shanghai. We collect real time moisture information by using non-contact humidity sensor designed and manufactured by us. When urinary incontinence, the sensor will send alert to mobile device via Bluetooth. If got the alert, the mobile device will send the alert to relatives of the aged or disabled people and cloud computing platform, through which we can make this information managed and displayed and the paramedic can be informed about the alarm. This paper gives a brief introduction to the framework of this system, the design of the non-contact sensor, the transmission of wireless data and the results of tests.

摘要：The design of a wireless water level control system is introduced and discussed in detail. In this system, the wireless Proportional Integral (PI) controller is developed using the LabVIEW graphical user programming language. Zigbee wireless technology is chosen for the wireless data transfer system. The experimental testbed was built and the system software and hardware were implemented. In order to compare the performance of the wired and wireless system, a corresponding wired water level control system was built. Experimental results show that under the same PI parameters, the settling time of the wired system is 3.3 times faster than the wireless system. However, the percent overshoot using the wireless controller is 4% smaller.

摘要：Web服务技术主要解决异构平台应用系统的集成和互操作问题。作为标准Web服务技术使用的消息协议,SOAP协议现在应用得越来越广泛。但是,SOAP的结构化标记复杂,其数据封装机制会导致数据量明显增大。所以,当系统采用Web服务技术实现大规模的数据交换时,SOAP协议的先天缺陷会使Web服务的实际性能下降很多。文章基于中央广播电视大学远程开放教育教务管理系统,提出一种轻量级跨平台通信传输架构。并在此架构基础上,实现了非持久同步和持久异步两种数据交换解决方案。

摘要：针对目前交通拥堵致使出行打车难的问题,设计并实现一种基于云计算的手机智能出租车呼叫系统。该系统由云服务器和Android手机客户端组成,服务器利用云计算环境下的Map-Reduce并行编程模型对K-means聚类算法实施并行化,提高推送信息的质量和效率;客户端分别利用LocationClient、MapView和MKOfflineMap接口实现定位服务、图层展示更新和百度离线地图服务功能,通过Android智能手机平台为用户提供及时、准确的信息服务。在客户端和服务器之间,利用RPC服务推送protocol Buffer协议序列化的信息。实验结果表明,与滴滴打车软件相比,该系统的搜索推荐效率提高了20%左右,离线地图展示及定位流量比在线方法减少了90%以上,快速响应性能较好。

摘要：针对移动支付系统中SIM卡访问安全问题,文章对其进行系统研究。首先分析在GP规范下实现手机客户端及支付系统访问规定规范。其次,以SWP方案为例建立SWP方案访问控制整体设计模型。最后,设计访问控制规则体系构架模型并实现访问规则文件指令写入。最终实现在GP规范下SIM卡SE针对手机客户端的访问控制。