一种基于改进的动态能量管理的无线传感器节点节能技术研究

针对无线传感器节点的结构特点,以动态能量管理技术为出发点,结合实际应用场合,提出了一种改进的动态能量管理节能模式,建立了不同工作模式下的无线传感器节点能耗模型,并对不同工作模式下的能耗进行了量化分析。分析结果表明,改进后的动态能量管理技术能够有效地降低无线传感器的能量损耗。分析结果为下一步无线传感器节点的节能改进设计打下了良好的基础。     

A review of the health effects and exposure-responsible relationship of diesel particulate matter for underground mines

The increasing use of diesel-powered equipment in confined spaces(underground mines) has the potential to over expose underground miners under the threat of diesel particulate matter(DPM). Miners in underground mines can be exposed to DPM concentrations far more than works in other industries. A great number of animal and epidemiological studies have shown that both short-term and long-term DPM exposure have adverse health effect. Based on reviews of related studies, especially some recent evidence, this paper investigated the long and short-term health effects based on animal studies and epidemiological studies. The exposure-response relationship studies were also explored and compared to the current DPM regulation or standards in some countries. This paper found that the DPM health effect studies specifically for miners are not sufficient to draw solid conclusions, and a recommendation limit of DPM concentration can be put in place for better protection of miners from DPM health risk. Current animal studies lack the use of species that have similar lung functions as human for understanding the cancer mode of action in human. And finally, the DPM health hazard will continue to be a challenging topic before the mode of action and reliable exposure-response relationship are established.     

基于WCDPM模型的细粒度物体识别

针对可变形部件模型(deformable parts model,DPM)同等对待各部件,无法体现不同部件对识别过程的贡献度差异的不足,提出一种权重系数可变形模型(weighted coefficient deformable parts model,WCDPM),对DPM中的各部件赋予权重,强调区分度较高的部件在识别过程的作用,弱化区分度低的部件对识别的影响,提高细粒度识别精度.同时给出了模型的训练过程和权重系数的学习方法.在Airplan OID和Oxford-IIIT Pet两个数据集上进行实验,验证了该方法的有效性.     

基于抗体选择策略的克隆挖掘算法

针对如何有效地利用大量的原始数据分析现状来预测未来的问题,基于抗体选择策略提出一种克隆选择挖掘算法。通过评估抗体的支持度、可信度和亲和度,求得有效的关联规则。实验结果表明,该算法能较快地获得可理解的规则,并且具有较高的准确率。     

基于netX50芯片的Ethernet／IP接口设计

主要对工业以太网进行了初步的阐述,并提出了一种基于netX50网络控制的实现工业以太网协议Ethernet／IP通信接口的设计。该设计采用C8051F020作为主控制器,netX50作为辅助控制器,MCU通过DPM双端口内存访问netX50并实现网络通信。     

Topology-assisted deterministic packet marking for IP traceback

A novel deterministic packet marking (DPM) for IP traceback against denial of service (DoS) and distributed denial of service (DDoS) attacks is presented, which features good scalability and high accuracy. In this scheme, an ingress router pre-calculates a Hash of its IP address and splits the Hash into several fragments. When marking a packet, the router randomly selects a fragment to mark into the packet. In the traceback stage the victim identifies the marked router with the help of the map of its upstream routers. Based on the map, the victim can identify a candidate ingress router after receiving only several marked packets. The scheme overcomes defects in previous deterministic packet marking schemes, where too much packets are required to recover a router and high false positive rate occurs in case of large-scale DDoS. Theoretical analysis, the pseudo code and experimental results are provided. The scheme is proved to be accurate and efficient and can handle large-scale DDoS attacks.     

基于三层结构的设备计划管理系统开发

分析了设备计划管理系统的流程需求，以及三层客户／服务器结构模型。并结合组件对象模型技术，给出了设备计划管理系统的三层客户／服务器结构和数据结构，设计了各层的组件及主要功能。     

基于ANSYS Fluent的气流喷雾干燥研究与仿真

基于气液两相流理论，采用Fluent对气流喷雾干燥的过程进行了仿真，得到了液滴通入前后的温度、速度、湿度场云图的变化情况，以及颗粒停留时间及含水量分布。结果表明:为防止粘壁现象的产生，液滴喷入塔体的速度不宜过高。为提高产品干燥效果，应适当延长干燥时间。对其喷雾干燥过程的三维数值模拟，为喷雾干燥塔的设计与制造提供了参考依据。     

Room temperature efficacious synthesis of diphenylmethane over Fe/Al-MCM-41 catalysts

Fe/Al-MCM-41 (Si/Al = 25, 50, 75 and 100) were synthesized. Their catalytic activity was evaluated towards benzylation of benzene with benzyl chloride in liquid phase. The catalytic activity of Fe/Al-MCM-41(25) was higher than the other catalysts. Diphenylmethane(DPM) was obtained as the major product with 100% selectivity and with 100% conversion of benzyl chloride under optimum condition. The effect of temperature and the feed ratio, on the activity of Fe/Al-MCM-41(25) and selectivity towards DPM was studied and a possible reaction mechanism was proposed.