电话防盗报警器

详细介绍了电话通讯技术以及安全报警技术的应用，二者如何有效地结合起来形成综合联网报警系统。分析了HT9200A和MT8870DC的电路结构，及与AT89C51的接口电路。     

Tracking video objects with feature points based particle filtering

For intelligent video surveillance, the adaptive tracking of multiple moving objects is still an open issue. In this paper, a new multi-object tracking method based on video frames is proposed. A type of particle filtering combined with the SIFT (Scale Invariant Feature Transform) is proposed for motion tracking, where SIFT key points are treated as parts of particles to improve the sample distribution. Then, a queue chain method is adopted to record data associations among different objects, which could improve the detection accuracy and reduce the computational complexity. By actual road tests and comparisons, the system tracks multi-objects with better performance, e.g., real time implementation and robust against mutual occlusions, indicating that it is effective for intelligent video surveillance systems.     

UAV imagery based potential safety hazard evaluation for high-speed railroad using Real-time instance segmentation

Potential safety hazards (PSHs) along the track needs to be inspected and evaluated regularly to ensure a safe environment for high-speed railroad operations. Other than track inspection, evaluating potential safety hazards in the nearby areas often requires inspectors to patrol along the track and visually identify potential threads to the train operation. The current visual inspection approach is very time-consuming and may raise safety concerns for the inspectors, especially in remote areas. Using the unmanned aerial vehicle (UAV) has great potential to complement the visual inspection by providing a better view from the top and ease the safety concerns in many cases. This study develops an automatic PSH detection framework named YOLARC (You Only Look at Railroad Coefficients) using UAV imagery for high-speed railroad monitoring. First, YOLARC is equipped with a new backbone having multiple available receptive fields to strengthen the multi-scale representation capability at a granular level and enrich the semantic information in the feature space. Then, the system integrates the abundant semantic features at different high-level layers by a light weighted feature pyramid network (FPN) with multi-scale pyramidal architecture and a Protonet with residual structure to precisely predict the track areas and PSHs. A hazard level evaluation (HLE) method, which calculates the distance between identified PSH and the track, is also developed and integrated for quantifying the hazard level. Experiments conducted on the UAV imagery of high-speed railroad dataset show the proposed system can quickly and effectively turn UAV images into useful information with a high detection rate and processing speed.     

基于蓝牙和J2ME的手机多媒体教学软件设计与实现

在多媒体教学过程中,教师容易受限于讲台,分发教学资料时学生轮流使用移动存储设备连接教学设备,效率低下,并且容易使某些病毒相互传播.为了保证教学质量,改善教辅工具,在分析了蓝牙无线技术、J2ME技术等相关技术的基础上,利用配备蓝牙模块的智能手机制作无线教辅工具,使用蓝牙手机无线控制PPT文件播放和无线批量传输文件.重点阐述了基于J2ME蓝牙无线技术的软件设计方案、实现中的关键问题和相应的解决办法,并进行了原型系统实验.实验结果表明:设计的软件不需要投入过多的成本便可实现移动手机控制多媒体教学,具有较高的应用价值.     

有界控制下单向收敛滑模控制

提出一种控制有界情况下状态单向收敛的滑模控制方法.对于二阶系统,单向收敛是指初始状态与状态到达滑动模态的位置位于相平面同一象限的过程.通过分析到达阶段的动态特性,揭示了状态非单向收敛的原因,并提出了一种单向收敛条件,给出了系统状态单向收敛的区域.将所提出的方法应用于具有单向收敛要求的交会对接控制系统,结果验证了所提出方法的有效性.     

一种改进的基于Delaunay三角网的聚类算法

Mundur等提出了一种基于Delaunay三角网的聚类算法,并将其应用于视频帧的多维特征数据的聚类以生成视频摘要,取得了较好的效果。但是,该算法计算量太大,导致效率不高。为提高该算法的效率,以适合于对大数据集的处理,提出了一种改进的基于Delaunay三角网的聚类算法。通过在典型数据集上的实验,提出了一种新的确定全局聚类阈值的方法,使得计算量大为减少。实验结果表明,该算法无需用户提供聚类参数,也能得到良好的聚类结果,因此能够实现聚类过程自动化;并且计算速度更快,效率更高,适合于大数据集的处理。     

Rabin密码算法的快速实现研究

首先分析了利用MRC方法改进Rabin密码的解密算法,然后结合素性测试的优化策略和运算数与Visual C++6.0的特性,提出一种基于递归技术的快速素性测试方法。     

高庄场滑坡稳定性及主要影响因素敏感性分析

四川省平武县高庄场镇后坡滑坡在汶川大地震后,发生了较为明硅的变形,严重威胁到当地居民的生命财产安全和交通安个。研究了此滑坡的性质及特征,采用不平衡推力传递法对其稳定性进行了分析与评价,并对其影响因素进行了敏感性分析。     

肉用发酵菌株的筛选及其在低盐发酵香肠中的应用

该研究以蛋白酶、脂肪酶活性和抑菌活性筛选肉用发酵菌株,通过分子生物学技术对其进行鉴定,并将其应用于低盐发酵香肠中,通过感官、理化及微生物指标分析评价其应用效果。结果表明,筛选鉴定得到两株适用于肉类发酵、安全且具有蛋白酶及抑菌活性的菌株,分别为植物乳杆菌（Lactiplantibacillus plantarum）BR-12和木糖葡萄球菌（Staphylococcus xylose）H-1,其中菌株BR-12还具有脂肪酶活性,两菌株间无拮抗作用。菌株BR-12与H-1按2∶1和1∶5的比例接种制备的低盐发酵香肠pH下降迅速,肠杆菌数与挥发性盐基氮含量较低,感官评分较高,硬度适中,弹性好,呈特有的玫瑰红色,且两菌株接种比例为2:1时,品质更好,说明菌株BR-12和H-1复配发酵有利于提高产品安全性,改善低盐发酵香肠滋气味,可用于低盐香肠发酵。     

河北太行山区泥石流启动的水岩相互作用

泥石流作为一种固-液混合而形成的地质灾害,其启动过程中必然存在着水与岩土体之间的相互作用。根据对太行山区泥石流形成的地形地貌、降雨、物源和人类活动特征等影响因素的分析,确定太行山区泥石流的崩滑动力和洪水动力两种启动类型。在此基础上,从水-岩系统耦合作用的角度,研究了太行山区泥石流形成过程中,洪水与固体颗粒之间彼此促进、相互制约的水岩化学作用、水岩物理作用和水岩力学作用,阐明了水岩相互作用对泥石流初始形成的促进机制,从而为泥石流启动预测预报体系的建立提供理论支撑。