Cloud based cyber-physical systems: Network evaluation study

In recent years, the Industry 4.0 concept brings new demands and trends in different areas; one of them is distributing computational power to the cloud. This concept also introduced the Reference Architectural Model for Industry 4.0 (RAMI 4.0). The efficiency of data communications within the RAMI 4.0 model is a critical issue. Aiming to evaluate the efficiency of data communication in the Cloud Based Cyber-Physical Systems (CB-CPS), this study analyzes the periods and data amount required to communicate with individual hierarchy levels of the RAMI 4.0 model. The evaluation of the network properties of the communication protocols eligible for CB-CPS is presented. The network properties to different cloud providers and data centers’ locations have been measured and interpreted. To test the findings, an architecture for cloud control of laboratory model was proposed. It was found that the time of the day; the day of the week; and data center utilization have a negligible impact on latency. The most significant impact lies in the data center distance and the speed of the communication channel. Moreover, the communication protocol also has impact on the latency. The feasibility of controlling each level of RAMI 4.0 through cloud services was investigated. Experimental results showed that control is possible in many solutions, but these solutions mostly cannot depend just on cloud services. The intelligence on the edge of the network will play a significant role. The main contribution is a thorough evaluation of different cloud providers, locations, and communication protocols to provide recommendations sufficient for different levels of the RAMI 4.0 architecture.     

邮件合并在高校学生管理工作中的应用

在强调高校学生管理工作中应用邮件合并意义的基础上,介绍了邮件合并在高校学生管理工作中的具体应用,尤其是带照片的准考证制作,详细地阐述了Microsoft office publisher和word两种制作带照片准考证的方法,并进行了对比分析.通过对邮件合并应用的分析,进一步证实了邮件合并的优越性,提出了邮件合并在高校学生管理工作中应用的具体措施.     

Use of Spreadsheets as an Introductory Tool for Solving Fluid-Structure Interaction Problem

A simple and intuitive manner for solving fluid-structure interaction problem has been developed using Microsoft Excel spreadsheets. By eliminating the need of previous knowledge of any programming language, the method appears as an interesting introduction to numerical solutions of partial differential equations, due to the direct and didactic way that it is developed. Proposed procedure enables the analysis of tridimensional geometries using the finite difference method and can be extended to other differential equations or boundary conditions. The author＇s objective in this paper is to develop a simple and reliable preliminary method for solving acoustic fluid-structure interaction problems with application to dam-reservoir interaction phenomena and also contribute in the educational growth for undergraduate students that are beginning research in such matter.     

Comparison between low-cost marker-less and high-end marker-based motion capture systems for the computer-aided assessment of working ergonomics

The paper deals with the comparison between a high-end marker-based acquisition system and a low-cost marker-less methodology for the assessment of the human posture during working tasks. The low-cost methodology is based on the use of a single Microsoft Kinect V1 device. The high-end acquisition system is the BTS SMART that requires the use of reflective markers to be placed on the subject's body. Three practical working activities involving object lifting and displacement have been investigated. The operational risk has been evaluated according to the lifting equation proposed by the American National Institute for Occupational Safety and Health. The results of the study show that the risk multipliers computed from the two acquisition methodologies are very close for all the analysed activities. In agreement to this outcome, the marker-less methodology based on the Microsoft Kinect V1 device seems very promising to promote the dissemination of computer-aided assessment of ergonomics while maintaining good accuracy and affordable costs.     

一种面向Microsoft Windows的AMBA设备PCI虚拟化机制

PKUnity-86是基于x86处理器和AMBA开放总线架构的系统芯片,既能快速集成各种标准IP核,又支持Microsoft Windows和x86应用程序.如何使AMBA设备支持工业标准的PCI设备枚举和访问,是支持Microsoft Windows 的首要问题.本文提出一种硬件VPCI机制,通过为AMBA设备实现虚...     

VBA无损检测数据库管理系统的开发及应用

开发应用VBA无损检测数据库管理系统,可解决无损检测结果统计、报告编制等工作需要人员多、花费时间长、易错易漏、滞后等问题,极大提高无损检测工作的准确性和工作效率,尤其是与互联网结合起来可实现远程控制管理,是现代无损检测企业提高管理效率的先进方法。     

2011年4月份十大重要安全漏洞分析

2011年03月21日至4月20日,国家计算机网络入侵防范中心发布漏洞总条目为360条,漏洞总数比上月增加了5.26。其中威胁级别为＂紧急＂的有51条,＂高＂的有60条,＂中＂的有205条,＂低＂的有44条。威胁级别为＂紧急＂和＂高＂的漏洞占到总量的30.83,从漏洞利用方式来看,远程攻击的有274条,本地攻击的有86条,局域网攻击的有0条。可见,能够从远程进行攻击的漏洞占绝大多数,这使得攻击者利用相应漏洞发动攻击更为容易。4月微软发布17个安全公告,其中9个为严重等级,8个为重要等级,共修复Microsoft Windows、Microsoft Office、Internet Explorer、Visual Studio、.Net Framework和GDI＋（图形设备接口）中的64个漏洞。此外,Adobe也发布通告公布了Adobe Flash Player、Adobe Reader和Acrobat中发现的一个零日远程代码漏洞,该漏洞已被利用进行攻击。建议广大用户及时安装补丁,增强系统安全性,做好安全防范工作,保证信息系统安全。     

应用Excel97软件设计饲料配方

Microsoft Excel97中文版是Microsoft Office97中文版集成软件中最重要的家庭成员之一，可以广泛应用于报表处理、数学计算、工程计算、财务处理、统计分析、图表制作和日常事务处理等各个方面，同时还具有数据库处理和网络数据交换等功能。基于Excel97上述功能，我们探讨应用该软件进行饲料配方设计(拟主要应用其报表处理、数据共享、规划求解及函数等功能)，简化计算配方的繁琐过程，为饲料工作者实际应用时提供参考。     

隧道监测信息管理与预警系统的研发及应用

针对隧道施工过程中监测的大量数据难于管理和分析的问题,采用Microsoft Visual C++集成编程环境和SQL Server 2000数据库开发了具有高度实用性、可靠性和扩展性的隧道监测信息管理与预警系统。该系统包含了隧道的勘查、设计和施工的相关资料,重点突出了测点监测数据的存储、处理、查询、分析和预测预警以及报表的自动输出功能。其中预测预警模块以累计位移量、位移速率和位移速率变化趋势作为围岩稳定性的综合判断依据,并根据工程监测经验给出了警戒级别的划分方法,能实时指导隧道工程的施工过程,规避可能存在的风险,保证隧道施工安全可靠。     

基于Excel的Brookfield系列旋转黏度计检定/校准数据处理

本文利用Micmsoft Excel强大的数据处理功能,建立了Brookfield系列旋转黏度计检定校准数据处理模版,最大程度地实现了该系列黏度计检定校准数据处理的自动化,解决了由于该系列黏度计规格型号多、量程多、查找数据及处理数据麻烦的难题,提高了检定校准工作的效率.