Design and Develop Online Monitoring and Early-warning System of Crane Structural Stress

This paper proposed an online monitoring and early-warning system of dynamic stress of crane metal structure, and designed this system’s hardware,including sensor unit,data gathering unit,and controlling & processing unit of this sys- tem,and discussed the waterproof protection for resistance strain wafer and scheme of data gathering and transmission of dynamic strain gauge,moreover developed system software of real-time and online monitoring dynamic stress,including data gathering by DLL and data display & processing based on Visual C++.The system applies the dynamic strain gauge to gather the data of the stress,and communicates between PLC control system of crane and upper industrial computer,so that realize the real-time online monitoring and early-warning for crane’s metal structure stress.The test results show this system carry on real time and online monitoring to dynamic stress of loud-bearing metal structure longly and stability,and can give an alarm and overload protection on time.So the system has good practice value.

Identification of time-varying system and energy-based optimization of adaptive control in seismically excited structure

The combination of structural health monitoring and vibration control is of great importance to provide components of smart structures.While synthetic algorithms have been proposed,adaptive control that is compatible with changing conditions still needs to be used,and time-varying systems are required to be simultaneously estimated with the application of adaptive control.In this research,the identification of structural time-varying dynamic characteristics and optimized simple adaptive control are integrated.First,reduced variations of physical parameters are estimated online using the multiple forgetting factor recursive least squares(MFRLS)method.Then,the energy from the structural vibration is simultaneously specified to optimize the control force with the identified parameters to be operational.Optimization is also performed based on the probability density function of the energy under the seismic excitation at any time.Finally,the optimal control force is obtained by the simple adaptive control(SAC)algorithm and energy coefficient.A numerical example and benchmark structure are employed to investigate the efficiency of the proposed approach.The simulation results revealed the effectiveness of the integrated online identification and optimal adaptive control in systems.

基于“超星学习通+希冀Online Judge”的多平台立体化教学模式在“数据结构”教学中的实践

作为信息技术相关专业中一门重要的专业核心课程,"数据结构"一直是教学改革的热门。针对“数据结构”抽象性和实践性强的特点,文章提出了一种基于“超星学习通十希冀Online Judge”的多平台立体化教学法,融合了两个平台的资源发布、作业管理,考试管理,程序自动评判等功能,并将其应用于教学实践。在实施过程中极大激发了学生的学习热情,提高了学生解决实际问题的能力,取得了良好的教学效果。

A Structural Topic Model for Exploring User Satisfaction with Mobile Payments

This study explored user satisfaction with mobile payments by applying a novel structural topic model.Specifically,we collected 17,927 online reviews of a specific mobile payment(i.e.,PayPal).Then,we employed a structural topic model to investigate the relationship between the attributes extracted from online reviews and user satisfaction with mobile payment.Consequently,we discovered that“lack of reliability”and“poor customer service”tend to appear in negative reviews.Whereas,the terms“convenience,”“user-friendly interface,”“simple process,”and“secure system”tend to appear in positive reviews.On the basis of information system success theory,we categorized the topics“convenience,”“user-friendly interface,”and“simple process,”as system quality.In addition,“poor customer service”was categorized as service quality.Furthermore,based on the previous studies of trust and security,“lack of reliability”and“secure system”were categorized as trust and security,respectively.These outcomes indicate that users are satisfied when they perceive that system quality and security of specific mobile payments are great.On the contrary,users are dissatisfied when they feel that service quality and reliability of specific mobile payments is lacking.Overall,our research implies that a novel structural topic model is an effective method to explore mobile payment user experience.

Genre Analysis of Online Company Profiles from Sporting Goods Brands

With the development of globalization and information technology,online company profile has been an effective commu-nication channel between companies and their target customers or clients.Online company profile,as a specific genre,has the dis-tinct features and functions in commercial activities.This study aims to do linguistic study of the constitution and the role of thesecompany profiles about sporting goods for communication on the Internet.To realize it,six company profiles have been selectedfrom the official websites of each sports company.The genre analysis of these samples is conducted from the perspective ofHasan’s Contextual Configuration(CC)and Generic Structure Potential(GSP).This thesis attempts to give the suggestions on howto compose a company profile for readers and sporting companies and the reference for the related researches in the future.

Design and Implementation of an Online Shopping System

The paper puts forward a kind of online shopping system based on ASP.NET technology,including the establishment of database and the design of the front web pages.The system uses Microsoft ASP.NET as development platform,C# as the server language,and Microsoft Visual Studio 2008 as the development tool.ADO.NET is used to connect with SQL SERVER 2000 database through the database controls.A variety of server controls are used to create the ASP.NET page to implement the system functions.The system is designed in 3-Layer application which includes Presentation Layer(PL),Business Logic Layer(BLL)and Data Access Layer(DAL).The operation of the database is in DAL,the logic function is in BLL.So the amount of work in the development,the difficulty of system maintenance and the upgrading can be reduced.After being tested,the system meets the requirement of the users.

A Process to Support Analysts in Exploring and Selecting Content from Online Forums

The public content increasingly available on the Internet, especially in online forums, enables researchers to study society in new ways. However, qualitative analysis of online forums is very time consuming and most content is not related to researchers’ interest. Consequently, analysts face the following problem: how to efficiently explore and select the content to be analyzed? This article introduces a new process to support analysts in solving this problem. This process is based on unsupervised machine learning techniques like hierarchical clustering and term co-occurrence network. A tool that helps to apply the proposed process was created to provide consolidated and structured results. This includes measurements and a content exploration interface.

Analysis of Soundproof Technology of Assembled Steel Structure Houses

The problem of noise has always been highlighted in assembled steel structure houses.Therefore,it is necessary to use effective soundproof measures where steel beams intersect with the reserved line pipe openings,doors,windows,elevator shafts,and other locations.In this paper,we will investigate the areas with subpar soundproof performance in an assembled steel structure residential project and propose suitable noise control measures to address this issue.

面向多目标优化主动运维的电能表远程在线评价系统设计

针对传统电能表远程在线评价系统中存在的系统建造成本耗费较大、评价结构过于繁琐等问题,从评价系统的构建和评价算法两方面开展研究。在评价系统的设计方面,加入反馈,使得该评价系统不仅可以整合各项评价指标进行规律化的采集,还可以对评价指标进行实时反馈,提高了评价的效率和评价信息传输的效率。在评价算法方面,基于解耦评价算法对电能表的运行状态和采集数据进行评价,对数据信息进行归纳处理,并根据大量的数据样本进行条理化分析评价。通过仿真实验可知,硬件反馈线路的数据传输效率高达98.6%,具有很好的传输能力。

在线知识社区中社会网络结构对用户创意质量的影响

个人在在线社区中与其他用户建立联系产生的社会关系是影响个人知识贡献意愿与产出能力的重要因素,但目前学界对此缺乏探究和解释。因此,为有目的地推进在线知识社区中高质量创意的产出,区分创意的客观质量和主观质量,探究在线知识社区用户的社会网络结构对两种创意质量的影响机制。以知乎平台为对象,利用931个用户数据,基于社会网络理论,分析用户的出度中心性、入度中心性、强关系3个网络结构变量对创意客观质量、创意主观质量的影响,以及用户的社区地位在其中的调节作用。结果表明:用户的出度中心性正向影响创意客观质量,入度中心性正向影响创意主观质量;用户的强关系数量正向影响创意客观质量,负向影响创意主观质量;同时,社区地位加强用户的出度中心性对创意客观质量的积极影响和用户的入度中心性对创意主观质量的积极影响,削弱用户的强关系对创意客观质量的积极影响,但加强用户的强关系对创意主观质量的消极影响。由此提出,在线知识社区管理者应有意识地支持和引导用户从出度中心性、入度中心性、强关系3个角度构建自己的网络结构,为社区持续稳定提供高质量创意。

大型船舶加筋板结构焊接裂纹在线检测研究

大型船舶加筋板结构焊接若出现裂纹,会降低加筋板结构强度,为船舶航行安全带来不可预估的风险,为此研究大型船舶加筋板结构焊接裂纹在线检测方法。使用有限元软件Ansys,依据船舶加筋板结构参数,对加筋板结构焊接裂纹模态进行模拟,获取大型船舶加筋板结构焊接裂纹模态,依据该模态,使用改进连续小波分解方式从加筋板结构焊接裂纹模态中获取裂纹对应的小波系数,通过获取裂纹模态小波系数突变点,依据该突变点得到加筋板结构焊接裂纹深度、长度、宽度等在线检测结果。实验结果表明,该方法可有效获取船舶加筋板结构焊接裂纹模态,并依据该模态在线检测到船舶加筋板结构焊接裂纹的长度、宽度等,应用效果较佳。

“钢结构设计原理”课程教学新模式的探索与实践

为响应《关于深化本科教育教学改革全面提高人才培养质量的意见》,提高本科教学质量,教学课题组探索了“钢结构设计原理”课程教学的新模式,即以线下教学为主,结合线上直播授课、网络教学平台以及QQ交流群内讨论答疑的方式开展课程教学,在尽可能给予学生最好的课堂学习体验的同时,也为他们提供优质的课后学习资料。线上与线下并行、理论与实践结合是该新模式探索的关键。此外,引入钢结构工程中蕴含的丰富的思政元素,综合提升学生的专业知识与思想品德素养。

基于结构方程的网约车平台用户价值共创行为影响因素研究

随着各种数字技术的迅速发展,我们已经进入数字经济时代。人们生活也因此发生了巨大变化,其中对人们影响较大的便是出行方式的改变。移动互联网技术的发展带来了网约车平台的诞生,也改变了顾客在企业价值创造过程中的地位。用户价值共创行为对于网约车平台和用户自身是一个双赢的过程,然而在现实中却只有少数用户有意愿参与价值共创活动,所以了解网约车平台用户价值共创行为的关键影响因素具有重要的实践价值。因此,文章选取绩效期望、努力期望、社会影响、服务体验和价值共创意愿五个变量,通过构建结构方程模型探究了网约车平台用户价值共创行为的影响因素。研究发现,社会影响和服务体验正向影响价值共创意愿,价值共创意愿进一步正向影响价值共创行为。

在线评测系统在生源多元化的高职院校程序设计类教学中的应用研究

对于高职院校的电子信息类专业而言,程序设计类课程(C语言程序设计、Python程序设计、Java程序设计等)属于必开的专业基础课。学生对于这些课程的掌握程度直接影响后续专业课程的学习。对于高职院校而言,生源结构多元化给程序设计类课程教学带来了巨大的挑战。文章通过在程序设计课程引入在线评测平台,自主建立题库,进行教学安排、课后学习、形成性考核,激发学生自主学习能力,解决学生学习没有目标、不能良好监督学生学习、教师反馈不及时等问题。教学实践证明,设计的教学系统教学效果良好。

面向结构化篇级科技文献数据治理的高性能分布式计算框架研究

[研究目的]为解决MapReduce、Spark等主流分布式计算框架存在的研发周期长、技术门槛高等问题,提出了一种高灵活、低门槛的高性能计算框架ArticleCF。[研究方法]ArticleCF框架吸收了主流分布式技术的优点,同时深度结合科技文献数据治理的特性,设计了Master/Slave的软件架构,在功能上针对科技文献数据特点进行多个维度的设计,重点设计了分布式任务分发策略、并行计算策略以及故障转移机制。[研究结论]通过21个指标将ArticleCF与MapReduce、Spark、Storm进行对比实验,有效验证所提方法的可行性、有效性,ArticleCF能够满足海量结构化科技文献数据的多样化处理需求。

基于碳基结构增敏型肥料中缩二脲检测的电化学传感器设计与评估

肥料通过调控植物生长发育而直接影响农作物产量,是推动现代集约化农业实现作物高产优质的重要因素;然而,尿素、含尿素复合肥生产过程中极易产生副产物缩二脲,目前由于肥料中缩二脲含量过高造成农田作物毒害问题不容忽视。建立高效的肥料中缩二脲检测方法对保障肥料生产安全、促进我国农业绿色高质量发展具有现实意义。本研究立足于我国现代农业发展对优质肥料的迫切需求,构建基于碳基结构材料敏感响应的电化学传感界面,实现肥料中缩二脲的在线快速评估,有效克服液相色谱法、紫外分光光度法存在的样品预处理繁琐、分析成本高、样品浊度干扰大等不足。首先,制备了兼具碳基结构表面特性和纳米金优良导电性质的石墨烯—纳米金复合物,并将其作为传感界面修饰材料固定于电极表面;其次,利用缩二脲对铜离子电化学信号的抑制作用,建立了铜离子响应电流随缩二脲浓度变化的线性回归方程,借助智能手机获取信号,进而实现缩二脲的电化学快速分析。实验结果表明,铜离子产生的响应电流与缩二脲浓度在1~80 mmol/L范围内呈良好的线性关系,检出限为0.50 mmol/L(S/N=3);利用该电化学传感体系用于肥料样品中缩二脲的分析,检测结果与高效液相色谱法分析结果相对误差不超过6.9%。该电化学分析方法应用于肥料中缩二脲的在线检测便携程度高、可靠性好、准确度高,为肥料中缩二脲快速评估提供了新方法,科技创新赋能农作物高产优质。

一种EtherCAT主站存取网络结构设计

针对EtherCAT主站存储和读取网络结构信息较为复杂的问题,设计一种先将网络结构信息与源代码分离,之后再将这些信息集成到可执行程序文件内部的方法。该方法在网络设计阶段通过配置软件将从站型号信息、型号索引、设备选型信息保存为文本文件;在软件构建阶段将上述文件与源代码一并处理生成程序;程序运行后通过型号索引直接寻址查询到设计方案中从站的ID,通过ID、从站数量对比实际部署的网络结构与所设计的方案是否一致。经测试验证,程序中存储的从站型号信息、型号索引及从站选型信息完整正确;在线检查网络结构功能可高效查询到方案中每个节点的型号信息并对比型号是否匹配。该方法实现简单且运行高效,有效降低主站和配套的网络结构设计工具的开发难度,同时改善了EtherCAT主站产品的用户体验和经济效益。

基于三合一有机混合模式的教学改革与实践--以结构力学课程为例

结构力学课程传统课堂存在教学内容单调、组织形式陈旧、考核评定单一等典型问题,影响工程教育持续改进。鉴于此,探索开展“线下课堂-线上SPOC-慕课堂”三合一有机混合的线上线下教学改革,主要包括对教学内容进行优化,对组织模式进行创新以及对考核评定途径进行信息化。实践表明,以学生为中心的三合一有机混合教学模式实现了多层次全过程的“教-学-评”轮转,有效提升学生的主观能动性,加强结构力学基本概念、原理和方法的理解,提高分析、计算和表达能力,取得良好的教学效果。相关改革经验可为其他课程的混合式教学实施提供参考。

供给侧结构性改革视角下高校在线课程发展研究

实现国家经济政策的战略调整和社会发展理念的转型升级,离不开高素质创新型人才的参与和支持。高校加快高素质创新型人才培养进程的基础、核心和关键是课程。以物联网、大数据、人工智能、虚拟现实等为代表的新一代信息技术,为现阶段高校全面推进课程特别是在线课程的创新建设与变革发展提供了全新思路、途径与方法。我国高校在线课程建设,先后经历了精品课程、精品开放课程、精品在线开放课程、一流本科课程等四个重要发展阶段,主要存在课程总量偏少、结构失衡、质量欠佳、效益偏低、创新不足等突出问题。依据供给侧结构性改革理论的基本原理和实践方法,建议从五个方面构建促进高校在线课程健康可持续发展的优化策略:一是增加总量,优化课程供给结构;二是培育增量,补齐课程供给短板;三是强化质量,提升课程供给水平;四是盘活存量,提高课程供给效率;五是扩大容量,创新课程供给环境。