网络文件传输系统安全评估及其改进方案

本文对电子政务中应用的网络文件传输系统进行安全风险评估,并根据评估结果提出改进安全性的建议方案。旨在增添一个风险评估的实际应用案例,为文件传输类的电子政务应用系统安全方案设计提供参考。     

保密文件传输系统的设计与实现

重点讨论了如何实现办公自动化文件传输的安全保密,并结合实际的需要,提出了一套完整的解决方案.重点介绍了保密文件传输系统,本系统用软、硬件结合的方式解决办公自动化的安全保密问题.     

基于Web的绿色产品制造工艺评价体系和方法的研究

通过对绿色产品制造工艺的分析，建立了基于Web的绿色制造工艺评价体系的层次结构图，并应用层次分析法和有限个方案多目标决策法相结合的方法，实现网上评价一个绿色产品多个制造工艺方案的最优解。     

基于VRML与Java的机械设计网上实验软件的研制

将VRML的Script节点和EAI有机结合．并应用于机械设计网上虚拟实验软件中．利用Java对VRML对象进行控制。从而在网上实现从准备、操作到结果分析整个虚拟实验过程．给出了一个刚性转于动平衡实验的具体实例。     

基于虚拟仪器的FTP应用

本文介绍了FTP的工作原理。描述了如何用LabVIEW编写程序实现FTP文件传输。比较了FTP文件传输的Active模式和Passive模式对传输速率的影响,也比较了应用命令行、LabVIEW自带FTP控件包编写程序和Uedie．exe从从机上下载数据到主机上数据传输速率的快慢。     

基于ARM的车载称重系统

介绍了基于ARM内核的INTEL PXA255处理器及Window CE系统的车载称重系统设计,该方案克服了传统称重系统中称重设备和车辆分离的缺点,并利用GPS系统对车辆实时监控,从而实现了交通管理部门对车辆超载的网络化智能化管理.着重介绍了该系统的软件和硬件设计方案,对数据采集处理模块设计、汽车电子控制系统的通信模块、文件传输模块进行了实例分析,并详细阐述了设计和开发的具体方法和过程.     

应用 .NET Remoting的文件传输系统的实现

提出基于.NET Remoting的文件传输系统的体系结构,并给出了实现文件传输的关键技术。     

基于XML的Web Service安全模型研究与实现

本文通过对Web Service存在的安全性问题和XML、SOAP的安全技术的分析,提出了一种Web Service安全方案,并对该方案的实现方法进行深入的研究。     

基于DLL的串口文件传输程序开发

文件传输是串口通信中经常涉及的一个领域，本文介绍了一种基于PCOMM．DLL的串口文件传输的编程实现方法，该方法程序流程较简单但功能强大，可通过串口完成任何类型文件的传输。文中给出了用VC＋＋实现的一般过程。     

安全生产检查管理系统的设计与实现

为了实现安全生产检查业务过程自动化．规范初查一复查一终查一单据审结各环节的管理流程．论文提出了将传统管理信息系统与工作流技术相结合的方案。为此，首先对安全生产检查管理系统进行了总体设计，其次介绍了工作流的概念以及工作流的基本架构，对安全生产检查管理系统进行了流程设计与建模，最后提出了基于．NET平台的功能实现并探讨了其实际应用价值。     

飞行时间质谱仪射频四极杆驱动器的研制

针对自制垂直引入式飞行时间质谱仪（orthogonal extraction time-of-flight mass spectrometer, O-TOFMS）的需要,运用直接数字频率合成 (direct digital frequency synthesis,DDS)技术,研制了射频四极杆的高压射频驱动电路装置。该驱动器频率可调范围为0.5~2 MHz,幅度最高达到1 000 Vp-p。该射频四极杆驱动器（radio frequency quadrupole driver,RFQ Driver）可用于分子离子反应器（molecule ion reactor,MIR）和RFQ驱动,其结构简洁、成本低、性能稳定可靠。     

Rapid one-of-a-kind production

To shorten the product development cycle time and reduce the cost at the same time, which is very critical for the survival of those small and mid-sized one-of-a-kind production (SMOKP) companies, various computer communication, simulation and computer aided engineering and management techniques have been widely used in these SMOKP companies. However, according to our study, the applications of these advanced computer technologies in these SMOKP companies are lack of system integration and synergy, which result in communication errors, reworks, duplications and hence a longer product development lead time and a higher cost. To solve this problem, an inter/intranet based computer aided rapid product development system is presented in this paper. This system consists of a number of inter/intranet based computer models or sub-systems for supporting rapid development of a one-of-a-kind product. It also employs a novel concurrent product development strategy called “prototype based incremental product development strategy” and an integrated product data structure called “product production structure”. Some industrial implementations of the proposed system, product development strategy and product data structure are also reported in the paper.     

从光电容积图中提取脉搏率、呼吸率和心率的新方法

光电容积描记图(PPG)是一种利用光学技术无创检测人体心血管脉搏波的方法。PPG信号来源于MIMIC数据库,它含有许多生理信息。本文提出了将集合经验模态分解(EEMD)、倒谱、快速傅里叶变化和过零点检测相结合的方法,从PPG中可靠地估算脉搏率(PR)、心率(HR)和呼吸频率(RR)。首先,将PPG信号通过EEMD分解为有限个固有模态函数(IMF)。因为EEMD有自适应滤波特性,所以估算不同的生理参数时,可以用不同的IMF分量来重构信号。其次,估算脉搏率时,舍去低频含有伪迹的IMF,再通过过零点检测可以得到瞬时脉搏率。然后,估算心率时,用1 Hz~1.67 Hz(60次/分钟~100次/分钟)的IMF来重构信号,再求倒谱,选取反映心脏活动的频带来得到心率。最后,估算呼吸率时,用0.05 Hz~0.75 Hz(3次/分钟~45次/分钟)的IMF来重构信号,然后对呼吸信号求快速傅里叶变化得到频谱图,寻找频谱图中的峰值得到呼吸率。对来自MIMIC数据库的53个成人PPG信号进行了仿真。仿真结果表明使用该综合信号处理方法提取的生理参数与实际生理参数一致,且该方法有运算量小,精确度高的优点(误差不超过1.17%)。     

Rapid one-of-a-kind production

To shorten the product development cycle time and reduce the cost at the same time, which is very critical for the survival of those small and mid-sized one-of-a-kind production (SMOKP) companies, various computer communication, simulation and computer aided engineering and management techniques have been widely used in these SMOKP companies. However, according to our study, the applications of these advanced computer technologies in these SMOKP companies are lack of system integration and synergy, which result in communication errors, reworks, duplications and hence a longer product development lead time and a higher cost. To solve this problem, an inter/intranet based computer aided rapid product development system is presented in this paper. This system consists of a number of inter/intranet based computer models or subsystems for supporting rapid development of a one-of-a-kind product. It also employs a novel concurrent product development strategy called “prototype based incremental product development strategy” and an integrated product data structure called “product production structure”. Some industrial implementations of the proposed system, product development strategy and product data structure are also reported in the paper.     

UPLC-MS/MS测定二苯甲烷二异氰酸酯

建立了二苯甲烷二异氰酸酯（MDI）的超高效液相色谱-串联质谱（UPLC-MS/MS）联用的分析方法。实验用甲醇作衍生试剂,将二苯甲烷二异氰酸酯衍生成二苯甲烷二氨基甲酸甲酯（MDC）,通过测定二苯甲烷二氨基甲酸甲酯来确定二苯甲烷二异氰酸酯的含量。实验采用Waters Acquity BEH C18超高效液相色谱柱,甲醇-0.1%甲酸作为梯度洗脱液,二苯甲烷二氨基甲酸甲酯在1.5 min内与其他化合物进行完全分离,经四极杆质谱选择离子监测模式检测。线性范围为2~100 μg/L,检出限为1 μg/L,相关系数0.999 4。考察了水、甲酸、甲酸铵流动相体系,以及进样量大小对样品的分离效果,发现甲酸流动相体系的分离效果优于其他两种流动相体系,同时发现在进样量大时出现平头峰。并且在优化条件下,对实际样品中游离的二苯甲烷二异氰酸酯进行了测定。     

血清AFP、CA199、GGT、ALP联检肝癌早期诊断价值

目的:探讨甲胎蛋白(AFP)、糖类抗原199(CA199)、谷氨酰转肽酶(GGT)和碱性磷酸酶(ALP)单独或联合检测对原发性肝癌(PHC)的早期诊断价值.方法:本研究为回顾性研究,筛选2016年-2019年本院87例原发性肝癌(PHC)患者、105例慢性乙肝患者及104例健康志愿者,收集不同组首次入院和体检外周血检测...     

简介虚拟制造中的网络虚拟现实技术

介绍了网络虚拟现实建模语言（VRML），VRML具有动态对象描述和超链接、通用性、扩展性、易实现性等特点。VRML浏览器和生成VRML文件的工具广泛使用于多种平台的计算机，是虚拟制造VM与虚拟设计中的网络虚拟现实技术的基础。     

基于工业设计和先进制造技术的产品快速开发

提出一种将工业设计与逆向工程（RE）、CAX技术、快速成型和快速模具结合起来的集成开发模式。在该模式下,利用RE技术直接将工业设计获得的实物模型转换为数据模型。数据模型在CAD系统中进行处理,构造曲面模型或STL模型表面、再经过STL模型表面的偏置处理,利用RP和RT技术直接、快速的制作出样件或小批量成品,利用CAM系统还可以输出机械加工需要的数据代码。本文洋细介绍了该模式的组成部分、工作流程以及接口等关键技术,并以一个实例来说明该模式的正确性和高效性。     

Effect on crystalline structure of AISI M2 steel using tungsten–thorium electrode through MRR,EWR, and surface finish

To investigate on the crystalline structure of AISI M2 steel by using tungsten–thorium electrode in electrical discharge machining (EDM) process was studied. Furthermore, the investigation were carried out for finding the value of material removal rate (MRR), electrode wear rate (EWR) and surface roughness (SR) of tool steel material depending upon three variable input process parameters. On the basis of weight loss, the value of MRR and EWR were calculated at optimized process parameter. Subsequently, surface topography of the processed material were examined through different characterization techniques like scanning electron microscopy (SEM), Optical surface profiler (OSP) and Atomic force microscopy (AFM), respectively. In XRD study, broadening of the peak was observed which confirmed the change in material properties due to the homogeneous dispersion of the particles inside the matrix. Lowest surface roughness and MRR of 0.001208 mg/min was obtained. Minimum surface roughness was obtained 1.12 μm and 2.18427 nm by OSP and AFM study, respectively. Also, minimum EWR was found as 0.013986 mg/min.