基于物联网技术的农业环境监测站的设计

针对农业环境检测提出一种基于物联网技术的农业环境监测站设计方案与实现过程。以瑞萨R8C单片机为控制核心实现对不同种类的环境参数检测传感器进行数据采集并进行数据格式的转换,实现对大气温湿度,风向,风速,太阳辐射度,土壤水分含量及温度的数据采集,采集器通过与单片机通信读取采集结果,并通过多种传输方式将信息发送到云计算中心服务器,通过客户端登陆农业环境监测系统实现农业环境数据的实时查看、历史数据分析及实时报警功能。通过长期实际应用,系统运行稳定可靠,能够有效实现对农业环境各项参数的监测。为农业向现代农业的转变提供了可行的低成本、高可靠的设计方案。     

Degree and connectivity of the Internet’s scale-free topology

This paper theoretically and empirically studies the degree and connectivity of the Internet's scale-free topology at an autonomous system (AS) level. The basic features of scale-free networks influence the normalization constant of degree distribution p(k). It develops a new mathematic model for describing the power-law relationships of Internet topology. From this model we theoretically obtain formulas to calculate the average degree, the ratios of the k_min-degree (minimum degree) nodes and the k_max-degree (maximum degree) nodes, and the fraction of the degrees (or links) in the hands of the richer (top best-connected) nodes. It finds that the average degree is larger for a smaller power-law exponent λ and a larger minimum or maximum degree. The ratio of the k_min-degree nodes is larger for larger λ and smaller k_min or k_max. The ratio of the k_max-degree ones is larger for smaller λ and k_max or larger k_min. The richer nodes hold most of the total degrees of Internet AS-level topology. In addition, it is revealed that the increased rate of the average degree or the ratio of the k_min-degree nodes has power-law decay with the increase of k_min. The ratio of the k_max-degree nodes has a power-law decay with the increase of k_max, and the fraction of the degrees in the hands of the richer 27% nodes is about 73% (the '73/27 rule'). Finally, empirically calculations are made, based on the empirical data extracted from the Border Gateway Protocol, of the average degree, ratio and fraction using this method and other methods, and find that this method is rigorous and effective for Internet AS-level topology.     

基于B/S架构的网络化可配置综合测试平台实现与应用

为解决电子装备在研制生产过程中普遍存在的测试设备通用性差、测试过程管理缺失等共性问题,改变当前单机测试孤立的测试作业模式,在进行测试标准库建设的基础上,参照物联网设计思维,网络化可配置综合测试平台基于B/S架构实现,将测试对象、测试仪器作为物联网中的传感节点来进行采集控制,结合可配置共性测试技术与信息集成技术,在网页上统一实现了测试任务管理、测试文件配置、测试用例执行、测试结果评估,实现了电子装备的各个测试阶段的联网检测与集成管理。测试平台形成了基于测试知识积累的高效测试产出能力,可缩短测试开发周期,提高测试效率与仪器利用率,提高测试数据利用维度,加强计划与质量管理,为电子装备的全生命周期管理提供重要支撑。     

基于RFID和无人机的畜牧定位系统

针对牲畜放养情况下出现的易走丢,难以定位和统计问题,设计实现了基于RFID和无人机的畜牧定位系统。系统主要由数据采集、数据处理和终端显示三个功能模块组成。通过给每个牲畜绑定一个有源RFID标签,结合装配有RFID阅读器和手机的无人机进行自动巡航,实现把RFID数据和扫描到RFID时所对应的经纬度数据经手机进行预处理,再使用移动数据网络发送到数据服务器。服务器端对数据进行进一步分析和处理后,将牲畜位置数据和统计数据在养殖户手机终端显示,方便养殖户进行牲畜查看和管理。最后通过实地实验,对获取到的数据进行结果分析,显示牲畜定位误差在系统估计误差范围之内,具有较高准确性。对比原有的修筑围栏等方式,本系统具有成本较低、使用方便、可行性高的优点。     

基于云计算和物联网的网络大数据技术研究

为了使网络大数据应用的范围更广,更大程度地提高网络数据存储与管理精度,减少网络数据处理与控制的时间,需要对网络大数据进行研究。当前的网络大数据研究方法多是采用Hadoop基础架构对网络大数据进行研究,在数据存储中没有设定具体的安全存储指标,无法得到数据安全存储指标权重,存在数据存储安全性能低,网络大数据研究精度偏差大等问题。为此,提出一种基于云计算和物联网的网络大数据研究方法。该方法首先利用分级网络编码对网络数据进行传输,以传输的数据为基础,采用CRC算法实现网络数据的计算,然后依据分组存储的方式将数据进行存储,最后利用分层逆序叠加定位法对网络数据进行高精度查询,由此完成对网络大数据的研究。实验结果表明,所提方法可以全面具体地对网络大数据进行研究,提高了数据处理精度和网络数据计算速度,增加了网络数据存储空间容量和查询效率,减少了网络数据运行时的丢失率,扩展了网络数据的运作范围,为后续网络大数据的研究提供了强有力的依据。     

用节点子树剪枝构造网络最短路径

从网络联结图的邻接矩阵出发．提出在Internet网络环境下直接构造网络最短主树的一种方法——节点子树剪枝法．在无约束条件和有约束条件(如转接数、传输链路带宽限制情况下),给出Internet最短主树算法．该算法用于计算Internet环境下可扩展的IP路由表具有较高效率．     

NOP – Ein neues organischchemisches Grundpraktikum: Nachhaltigkeit per Internet

The sustainable organic chemistry lab course for the new milennium (NOP) makes use of the possibilities that an interactive website provides compared to a conventional lab course published as a textbook or manual. The prospective synthetic chemist can thus gain a more in‐depth understanding of his/her experiments. Detailed information about analytical methods, background information about the sub‐ stances being used and being formed during the experiment and “management ratios” like substance efficiency and energy efficiency are provided. Last but not least, knowledge about the concept “sustainable development” is being adapted to the domain of synthetic chemistry.     

Internet上的离子交换树脂信息检索

本文主要介绍了在Ｉｎｔｅｒｅｔ网上检索和查询有关离子交换树脂技术和产品等信息的方法和技巧。并提供了一些实用的ＵＲＬ地址。     

多营销渠道模式下H酒店客房销售渠道的选择分析

“互联网+酒店管理”背景下,酒店的客房销售渠道从单一向多样化发展,同时,顾客选择何种渠道订购客房服务受价格和非价格等多种因素影响。因此,如何综合考虑多种因素对酒店客房多销售渠道模式进行评价和排序,对提高酒店客房销售收益至关重要。基于此,本文运用层次分析法(Analytic Hierarchy Process,AHP)对酒店客房销售渠道选择进行量化分析,研究其在实际决策中的运用。结果表明:在线旅行社(online travel agent,OTA)的优先级别最高,其次是门市预订、官网预订、酒店APP预订、旅行社、批发商和电话预订。     

Dual adaption based evolutionary algorithm for optimized the smart healthcare communication service of the Internet of Things in smart city

The Internet of Things (IoT) is a revolutionary technique of sharing data for smart devices that generates huge amounts of data from smart healthcare systems. Therefore, healthcare systems utilize the convergence power and traffic analysis of sensors that cannot be satisfactorily handled by the IoT. In this article, a novel mutation operator is devised and incorporated with the differential evolution (DE) algorithm. Two tests have been conducted in the validation process. Firstly, the newly dual adaption-based operators incorporated with the differential evolution algorithm are being proposed. The proposed approach provides sufficient diversity and enhances the search speed of nature’s local and global search environments in the problem. The proposed method incorporates the application of IoT-based smart healthcare. Second, an application-based test has been conducted, in which the proposed approach is applied to the application in the smart healthcare system. Therefore, IoT sensor deployment is an optimization problem to minimize service time, delay, and energy loss by considering the communication constraint between sensors(objects). The proposed algorithm is applied in this article to solve this optimization problem. Further, in the experimentation and comparative study, the proposed method is superior to the standard evolutionary algorithms in IoT applications concerning the minimum number of function evaluations and minimization of traffic services. The proposed approach also achieves efficiency in the minimum loss of energy in each service and reduces load and delay.