Image processing based three-dimensional model reconstruction for cross-platform numerical simulation

Numerical simulation is the most powerful computational and analysis tool for a large variety of engineering and physical problems.For a complex problem relating to multi-field,multi-process and multi-scale,different computing tools have to be developed so as to solve particular fields at different scales and for different processes.Therefore,the integration of different types of software is inevitable.However,it is difficult to perform the transfer of the meshes and simulated results among software packages because of the lack of shared data formats or encrypted data formats.An image processing based method for three-dimensional model reconstruction for numerical simulation was proposed,which presents a solution to the integration problem by a series of slice or projection images obtained by the post-processing modules of the numerical simulation software.By means of mapping image pixels to meshes of either finite difference or finite element models,the geometry contour can be extracted to export the stereolithography model.The values of results,represented by color,can be deduced and assigned to the meshes.All the models with data can be directly or indirectly integrated into other software as a continued or new numerical simulation.The three-dimensional reconstruction method has been validated in numerical simulation of castings and case studies were provided in this study.

The Design and Implementation of Qt-based Cross-platform Video Conferencing Remote Control

In order to overcome the defects of the dedicated video conference remote control, this paper designs and implements a Qt-based cross-platform video conferencing remote control. The remote control not only implements a full range of video conferencing control functions with an easy-to-use visual interface;but also implement cross-platform feature to allow users to use remote control software on their own equipment. It is economic, convenient and stylish for users. This paper mainly describes the design and implementation of remote control system framework and cross-platform features. Finally, the result in the paper shows: This remote control is reliable and easy to use.

A mobile application framework of the BIM-based facility management system under the cross-platform structure

The building information model/modeling （BIM） technology is currently applied in a broad range of applications and research for facility management, while the BIM-based mobile FM is difficult owing to various factors and environments. For example, the mobile applications usually require frequent cross-equipment compatibility. This paper proposes a reasonable BIM-based FM cross-platform framework and develops a mobile application on the basis of an existing BIM-based FM system. The developed mobile application is applied in a case study of a metro station project in Guangzhou to verify its effectiveness in FM practice. It helps maintenance staff in viewing BIMs, accessing related information, and updating maintenance records in a unique platform. The test results demonstrate that the proposed BIM-based cross-platform framework meet the FM application requirements and supports the extension of FM functions.

A Scalable Method for Cross-Platform Merging of SNP Array Datasets

Single nucleotide polymorphism (SNP) array is a recently developed biotechnology that is extensively used in the study of cancer genomes. The various available platforms make cross-study validations/comparisons difficult. Meanwhile, sample sizes of the studies are fast increasing, which poses a heavy computational burden to even the fastest PC.Here, we describe a novel method that can generate a platform-independent dataset given SNP arrays from multiple platforms. It extracts the common probesets from individual platforms, and performs cross-platform normalizations and summari-zations based on these probesets. Since different platforms may have different numbers of probes per probeset (PPP), the above steps produce preprocessed signals with different noise levels for the platforms. To handle this problem, we adopt a platform-dependent smoothing strategy, and produce a preprocessed dataset that demonstrates uniform noise levels for individual samples.To increase the scalability of the method to a large number of samples, we devised an algorithm that split the samples into multiple tasks, and probesets into multiple segments before submitting to a parallel computing facility. This scheme results in a drastically reduced computation time and increased ability to process ultra-large sample sizes and arrays.

The Technical Design and Implementation of Cross-Platform Industrial Product Order System

According to some data in the Industrial Purchasing Trends report released by China in 2017,we can see that e-commerce purchasing channels have ranked first among all industrial products purchasing channels in China compared with European and American countries.In addition,in the whole industrial product purchasing market,we can also see that both manufacturers and suppliers are making active e-commerce transformation,and some other Internet giants are also actively entering the industrial product e-commerce industry.But at present,the revenue of all kinds of subjects is still a lot of room for improvement compared to the United States industrial giants.Although the domestic e-commerce market of industrial products has a variety of problems,also contains huge opportunities and development space.Today mobile Internet technology is becoming more and more popular.It is particularly important to develop a cross-platform industrial product order system that supports the collaborative work and unified experience of Android,iOS,and Web.This system uses a uni-app framework to develop front-end applications,which can realize an order management system with code running across multiple platforms.The back end is built based on LNMP architecture.Linux is the most popular free operating system.Nginx is a free and efficient web server with good stable performance,rich functions,simple operation and maintenance,fast processing of static files,and minimal system resource consumption.MySQL database is one of the most widely used relational databases in Web application data processing.The server side is written by PHP script under ThinkPHP framework,which is quick,open-source,and cross-platform in system construction.And these four kinds of software are free,open-source software,together,they can become a free,efficient,highly extensible website service system.

GeoPyTool:A cross-platform software solution for common geological calculations and plots

GeoPyTool is an open source application developed for geological calculations and plots,such as geochemical classification,parameter calculation,basic statistical analysis and diagrams for structural geology.More than acting as a link from raw data stored in Microsoft Excel■(MS Excel)files to vector graphic files,GeoPyTool includes recently developed routines that have not been included in previous software,such as the calculation of the Ce(Ⅳ)/Ce(Ⅲ)ratio for zircons as a method to examine the temporal evolution of oxygen fugacity in the magmatic source for igneous rocks,and the temperature calculator with titanium in zircon and zirconium in rutile.Besides these routines,GeoPyTool also allows users to load any figure from articles or books as a base map.As a Python-based crossplatform program,GeoPyTool works on Windows?,MacOS X?and GNU/Linux.GeoPyTool can do the whole process from data to results without the dependence of Microsoft Excel?,CorelDraw?and other similar software.It takes Excel?XLSX and CSV(Comma Separated Value)as the formats of both the input data source files and the output calculation results files.The figures generated by GeoPyTool can be saved as portable network graphics(PNG),scalable vector graphics(SVG)or portable document format(PDF).Another highlight of GeoPyTool is the multilingual support,the official versio n of GeoPyTool supports both Chinese and English,and additional languages can be loaded through interface files.GeoPyTool is still in the development stage and will be expanded with further geochemical and structural geology routines.As an open source project,all source code of GeoPyTool are accessible on Github(https://github.com/GeoPyTool/GeoPyTool).Users with Python experience can join in the development team and build more complex functions expanding the capabilities of GeoPyTool.

随动辊压型低应力精密断料教学实验平台开发

为了增强学生对先进成形装备及低应力精密断料技术的理解,开发了随动辊压型低应力精密断料教学实验平台。该实验平台综合利用机械设计、传感器技术及计算机控制技术,将应力集中效应和随动辊压技术引入管料的精密分离断料工序中,设计了管料断面质量评价方法,对带有V型槽的45#钢及304不锈钢管料进行了裂纹可控式低应力精密下料实验,验证了断料效果。该实验平台不仅使低应力断料过程更加直观,还提升了学生对低应力精密成形技术的认识,增强了学生对“机械制造工程基础”“切削原理与刀具”及“先进制造技术”等课程的学习兴趣。

服装跨境电子商务平台型企业供应链运营比较研究——以SHEIN与ASOS为例

供应链运营对服装跨境电子商务企业的发展十分重要。通过分析当前国内外代表性服装跨境电子商务企业的供应链运营现状,从供应链结构、供应链决策、产品组合、快速反应、供应链合作、数字化技术方面分析平台型服装企业供应链运营特点,进而以我国SHEIN和英国ASOS的供应链运营模式为例,应用供应链运营参考模型(SCOR)对其计划、采购、生产、配送和退货等环节进行分析,并结合平台型服装企业供应链运营特点对二者进行比较研究。最后从企业发展定位和目标、品牌一致性和质量控制、企业核心竞争力、供应链伙伴关系、数字化技术的运用等五个方面,为服装跨境电子商务企业的供应链运营与管理提供启示。

我国跨境电商服务行业发展趋势研究

近年来,跨境电商服务行业受到了广泛关注。新时期,企业成本结构发生了较大变化、行业合规化趋势愈演愈烈,供需关系也发生了深刻变革。跨境服务商通过跨地区、多平台的形式不断拓宽业务范围,提升服务价值内涵,巩固自身竞争地位。此外,当前TikTok平台的流行和语言障碍的破除为跨境服务商提供了新的发展机遇。相关服务商依托专业资源为跨境卖家创造和传递价值,探索跨境电商共赢模式。同时,服务商还通过创新的技术和服务,为卖家提供更高效、更便捷的服务,帮助卖家降低成本、提高效率。综上,服务商在跨境电子商务领域中扮演着越来越重要的角色,为卖家提供了更多的机会和更好的服务。

跨区域重症远程协同服务平台设计与应用

目的:建设跨区域重症远程协同服务平台,推动优质医疗资源下沉与均衡分布,探索专科医联体建设新路径。方法:依托5G技术、KVM等技术建设跨区域重症远程协同服务平台。结果:四川大学华西医院重症医学学科与信息中心,联合第三方医学信息服务商共同建设华西医院重症医学学科联盟远程重症协同系统,破解医疗信息跨院安全传输障碍,开发远程监护、远程会诊、远程实操、远程教育、远程质控5大功能模组,服务13省140家成员单位,提供会诊查房约250例/年,教学直播约200场/年。结论:现有通信相关技术可以成功建设跨区域重症远程协同服务平台,保障患者数据安全,提高远程协同效率,实现医疗资源、教学资源共享。

复杂受荷下盾构隧道原型结构试验平台的研发与实证

盾构隧道结构在全寿命周期中往往将面临诸多复杂荷载状态,如注浆、偏载、偏转等非对称偏不利工况。为验证结构在这些复杂荷载状态下的适用性,探究结构力学性能,开展足尺原型结构试验研究往往是最为直接而有效的手段。既有原型试验主要关注隧道结构在简单对称荷载条件下的力学性能,鲜有关注复杂非对称荷载状态。为拓展原型试验的适用范围,提出了适用于不同断面盾构隧道结构的原型试验平台和用于模拟复杂荷载状态的试验荷载设计方法。该方法适用于任意加载点布置和液压站分组的试验系统,可对注浆、偏载、偏转等复杂荷载状态下结构响应进行精确模拟。通过类矩形盾构隧道、双圆隧道和圆形隧道的偏载原型结构试验研究,验证了试验平台和试验荷载设计方法的适用性。进一步针对试验关键参数的分析表明,控制目标权重系数的调整能有效满足不同的试验模拟要求;基于试验荷载设计方法优化的迭代算法能有效考虑计算模型或边界支承条件的非线性;环箍钢绞线和千斤顶的组合加载模式能将拟合误差水平降低至千斤顶加载模式的1/5,但需要删去部分加载点使试验荷载合理且适用;对于越复杂的结构和荷载,精确模拟结构状态需要的试验系统独立荷载组数越高,对试验平台的要求也越高。

用户生成内容对消费者跨境电商平台行为意向的影响

摸清用户生成内容的内涵及其对消费者行为意向产生的影响机制,有利于跨境电商平台实施精准的营销策略。通过问卷调查收集数据,基于TAM模型理论实证分析用户生成内容对消费者跨境电商平台行为意向的影响情况。结果显示,用户生成内容的发布者和时效性对消费者跨境电商平台行为意向产生显著正向影响;用户生成内容的专业性对消费者在跨境电商平台上的购买意愿产生显著正向影响;用户生成内容的关注度对跨境电商平台的推荐意愿产生显著正向影响;文字评论类内容对消费者跨境电商平台购买意愿的影响明显小于社交分享类内容产生的影响;同时,高中及以下学历的消费者在跨境电商平台上的行为意向明显低于研究生学历的消费者。因此,为了增强消费者对跨境电商平台的行为意向,作为跨境电商平台,首先,需要充分发挥知名发布者对平台正面宣传与推介的头雁效应,鼓励广大用户适时更新在线内容;其次,善于打造具有专业水准的在线内容,提高在线内容的阅读量和被点赞量;最后,要注重生成社交分享类的在线内容,并着力发布通俗易懂的平台简介与简明的平台交易流程。

平台特征对跨社交媒体UGC信息分享行为的影响机理研究

[目的/意义]探究平台特征对跨社交媒体UGC信息分享行为的影响,揭示用户跨社交媒体场景的新特征。[方法/过程]通过刺激—机体—反应(SOR)理论框架构建平台特征对跨社交媒体UGC信息分享行为的中介调节模型,以时间维度和平台维度拼接应用商城数据、百度指数数据、社交媒体数据等,构建多源异构面板数据集作为样本,使用固定效应模型验证相关假设。[结果/结论]平台的声誉和用户服务技术迭代通过感知有用性正向影响跨社交媒体UGC信息分享,而平台的关注度通过感知有用性显著负向影响信息分享行为;平台声誉和用户服务技术迭代对感知有用性和跨社交媒体UGC信息分享之间的关系具有负向调节作用。本文关注跨社交媒体UGC的信息分享行为,为UGC创作者采用跨社交媒体信息投放策略提供参照,为社交媒体维护平台生态提供启示。

基于改进差分进化算法的跨平台武器目标分配方法

现代战争中,跨平台武器单元的协同利用,是合同编队体系的重要内容,作战方式也正由平台级协同向着能力要素级协同转变,这对武器目标分配问题的解决提出了更大挑战。本文将武器单元的最小划分单位细化到能力要素级,以毁伤概率与成本消耗为优化目标,面向多种来袭目标的编队防空场景,提出了跨平台武器目标分配算法。同时,基于混沌映射提出了混沌种群重构(chaotic population reconstruction,CPR)机制,并结合带存档的自适应差分进化(adaptive differential evolution with optional external archive,JADE)算法提出了CPR-JADE算法,利用CPR机制可以帮助算法在解决高维复杂约束问题时跳出局部最优。再将其运用到武器目标分配模型上,实现了对模型的高效求解。最后,通过在多种数据规模下与其他进化优化算法的仿真对比试验分析,验证了所提方法的正确性与有效性。

跨平台访问端传感网络串口通信多线程实现

串口是外部串行设备与计算机之间的关键数据传输通道,由于跨平台访问端的传感器数据来自不同平台,具有显著独立性,融合难度较大,直接影响多线程通信效率。提出一种针对跨平台访问端传感网络的串口通信多线程实现方法。构建跨平台访问端,采用统计概率置信度算法,修正或剔除传感网络数据中的异常值。从时间相关性和空间相关性,完成传感网络的数据融合。依据信标时序补偿网络时钟同步法、父子链路时序轮转调度法,分配多线程执行信息传输,实现跨平台访问端传感网络串口多线程通信。实验表明:当线程数量由1增加至16时,在低网络流量和高网络流量负载情况下,所提方法的传感网络延迟可控制在0.53 ms以内。且在相同传输错漏率下,所提方法的进程平均超限步数始终更低。

基于YAML的iOS应用开发框架

为解决初学者使用Swift语言编写iOS程序上手难,公司开发多平台应用程序成本高等问题,本文基于跨平台开发理念实现一种通过编写简单易学的解释性配置文件YAML进行苹果应用开发的iOS框架。首先调研第三方语言开发苹果应用的可行性,其次在YAML语法中对UI控件、样式渲染、网络请求等进行抽象及结构定义,框架底层根据结构定义依次完成资源加载、数据处理、控件创建及用户交互等核心功能。并基于该框架设计开发一个在线问诊应用(AitmedCare),且成功上线Apple Store,配合Web和Android框架可以达到开发一套代码发布在多平台的目的。应用的成功发布表明框架从功能性、安全性等角度符合iOS软件的开发规范,可以被应用于iOS开发。

基于图搜索的陆空两栖平台3D路径规划算法

为了解决陆空两栖平台路径规划能效与寻径效率问题,提出了一种基于图搜索算法的全局路径规划算法。考虑了空中飞行能耗与地面行驶能耗模型的不同,结合起飞阈值、地面移动成本系数、空中移动成本系数等参数决定模态切换机制,在遇到难以越过的障碍时使用逃脱算法脱困,当允许地面通过时优先采用地面行驶的方式到达目标点以提升寻径效率与能效。为验证该算法,分别建立了针对陆空2种模式下的能耗模型,在现有交通规则约束下完成城市场景和虚拟迷宫测试。结果表明:本算法的搜索效率相较于对照组算法提升了30%以上,有效提升搜寻效率的同时降低了能量消耗。

基于改进A^(*)算法的越障平台路径规划研究

针对传统方法构建的栅格地图无法准确体现搜救平台具备越障能力的局限性,将实际环境划分为障碍区、越障通行区和无障碍区,依照通行权重建立了包含3类环境特征的二维栅格地图。考虑到越障平台在越障过程中转向不便的局限,针对性提出了一种改进的A^(*)算法,将路径转弯次数和转弯角度作为代价评估函数的一部分,对算法进行优化。将传统A^(*)算法和改进的A^(*)算法进行对比试验,实验结果表明:与传统算法相比,改进算法规划的路径、寻路代价有所改善,路径长度、转弯次数和转弯角度均大幅减少,更适用于具备越障能力的搜救平台。

基于Qt的跨平台液漏监测系统设计

针对液漏监测技术的需要,设计一种能够实时监测管道泄漏,并将结果显示到上位机界面上的测漏监测系统,以便用户能够时刻了解管道的泄漏状态。传统的液漏监测系统都是采用基于Windows系统开发的上位机软件,对某些场景存在硬件携带不方便的问题。因此根据该监测系统使用场景的不同,基于Qt的跨平台特性开发了一款液漏监测系统的上位机软件,该软件不仅可以在Windows系统中使用,也可在Android移动设备中使用。实验表明,系统能够稳定工作,有检测和定位泄露信号的能力,上位机软件针对不同的平台不需重复开发,有效地降低了成本,同时针对不同的场景使用不同平台上的上位机软件,很大程度上减少了用户的工作量。

政务新媒体传播效果及其影响因素研究——基于社会临场感理论视角下的跨平台比较

以社会临场感理论为研究基础,以S省交警微博、微信和抖音3个平台账号中的2 031条数据为研究样本,采用回归分析法来考察政务新媒体跨平台信息传播效果及其影响因素。结果表明,社会临场感理论视角下,政务新媒体通过内容生产创设公众参与情境,吸引公众对政务信息的关注、接受与分享。而在此过程中,支撑“临场感”建构的情感策略、互动策略与凝聚力策略在不同平台会产生差异化的传播效果。此外,不同的平台、不同的内容主题也会对政务新媒体信息传播效果产生差异化影响。基于此,政务新媒体的内容运营需根据不同平台的特点,通过积极创设社会临场感来提升传播效果,在内容整体定位上应使用关系导向和以他人为中心的信息发布策略,在主题设置与策略选择上则应依据社会临场感的不同维度、不同平台的技术逻辑与活跃用户需求,差异化运营政务信息。