Computer science as an academic discipline began in the 1960’s. Emphasis was on programming languages, compilers, operating systems, and the mathematical theory that supported these areas. Courses in theoretical computer science covered finite automata, regular expressions, context-free languages, and computability. In the 1970’s, the study of algorithms was added as an important component of theory. The emphasis was on making computers useful. Today, a fundamental change is taking place and the focus is more on a wealth of applications. There are many reasons for this change. The merging of computing and communications has played an important role. The enhanced ability to observe, collect, and store data in the natural sciences, in commerce, and in other fields calls for a change in our understanding of data and how to handle it in the modern setting. The emergence of the web and social networks as central aspects of daily life presents both opportunities and challenges for theory.
标签: Foundations Science Data of
上传时间: 2020-06-10
上传用户:shancjb
This documentation is the original work and copyrighted property of X-Powers. Reproduction in whole orin part must obtain the written approval of X-Powers and give clear acknowledgement to the copyrightowner.
标签: AC101
上传时间: 2022-06-28
上传用户:xsr1983
智能称重系统的设计资料要以微控制器为控制核心,通过称重传感器实现对灌装气体重量的自动检测及控制,但普遍存在称重精度不高、功能不全等问题。本文旨在以高性能STC11F32XE 单片机为控制核心,设计出高精度数据采集、宽温度工作范围的智能燃气灌装称重系统。1 系统硬件电路设计1. 1 整体硬件电路设计燃气灌装称重控制系统主要包括: 信号采集、信号调理、灌装过程控制、数据显示等模块。其中的信号调理模块对传感器的mV 输入信号进行滤波、放大、A/D 转换后送入单片机STC11F32XE 进行处理; 电源电压电路给各模块电路提供数字5 V 和模拟5 V 直流电压; 数码管显示器、键盘、蜂鸣器及指示灯构成人机交互模块; 温度传感器DS18B20 采集环境温度供传感器温度补偿时使用( 见图1) 。1. 2 信号采集及调理电路据设计要求,称重传感器选用铝合金悬臂梁结构的应变片式传感器,其有效的最大输出在20 mV以内,为了拓展其A/D 转换器的满量程有效利用范围,需要对其进行差动放大。同时,为了提高其抗干扰能力,对传感器输出信号进行二阶低通滤波, IN -和IN + 为传感器输出的差动信号,S3 和S4 是磁珠,对高频干扰信号有一定的抑制作用; 运算放大器采用精密双运放OP2177,放大电路的放大倍数由R10、R31 和RG1 决定
标签: 智能称重系统
上传时间: 2022-07-24
上传用户:
介绍了基于 STC11F32XE 和 A / D 转换器 ADS1230 的燃气灌装称重系统,并提出了其硬件电路设计和软件设计流程。该系统具有对传感器进行温度误差补偿、自动校准等功能。通过试验证明,该系统具有测量精度高、稳定可靠等优点。近年来,国内燃气灌装设备已部分实现智能化,主要以微控制器为控制核心,通过称重传感器实现对灌装气体重量的自动检测及控制,但普遍存在称重精度不高、功能不全等问题。本文旨在以高性能STC11F32XE 单片机为控制核心,设计出高精度数据采集、宽温度工作范围的智能燃气灌装称重系统。1 系统硬件电路设计1. 1 整体硬件电路设计燃气灌装称重控制系统主要包括: 信号采集、信号调理、灌装过程控制、数据显示等模块。其中的信号调理模块对传感器的mV 输入信号进行滤波、放大、A/D 转换后送入单片机STC11F32XE 进行处理; 电源电压电路给各模块电路提供数字5 V 和模拟5 V 直流电压; 数码管显示器、键盘、蜂鸣器及指示灯构成人机交互模块; 温度传感器DS18B20 采集环境温度供传感器温度补偿时使用( 见图1) 。1. 2 信号采集及调理电路据设计要求,称重传感器选用铝合金悬臂梁结构的应变片式传感器,其有效的最大输出在20 mV以内,为了拓展其A/D 转换器的满量程有效利用范围,需要对其进行差动放大。同时,为了提高其抗干扰能力,对传感器输出信号进行二阶低通滤波, IN -和IN + 为传感器输出的差动信号,S3 和S4 是磁珠,对高频干扰信号有一定的抑制作用; 运算放大器采用精密双运放OP2177,放大电路的放大倍数由R10、R31 和RG1 决定。调理电路如图2 所示。
标签: 燃气灌装称重系统
上传时间: 2022-07-29
上传用户:
Distributed Median,Alice has an array A, and Bob has an array B. All elements in A and B are distinct. Alice and Bob are interested in finding the median element of their combined arrays.
标签: array B. Distributed has
上传时间: 2013-12-25
上传用户:洛木卓
About: hamsterdb is a database engine written in ANSI C. It supports a B+Tree index structure, uses memory mapped I/O (if available), supports cursors, and can create in-memory databases. Release focus: Major feature enhancements Changes: This release comes with many changes and new features. It can manage multiple databases in one file. A new flag (HAM_LOCK_EXCLUSIVE) places an exclusive lock on the file. hamsterdb was ported to Windows CE, and the Solution file for Visual Studio 2005 now supports builds for x64. Several minor bugs were fixed, performance was improved, and small API changes occurred. Pre-built libraries for Windows (32-bit and 64-bit) are available for download. Author: cruppstahl
标签: C. hamsterdb structure database
上传时间: 2013-12-11
上传用户:LouieWu
2004China Undergraduate Mathematical Contest in Modeling (CUMCM)是2004年全国数学建模大赛的题目(B题)。现将题目,建模过程及利用“多元线性回归和人工神经网络”解题的源代码上传给大家一起分享。
标签: 2004 Undergraduate Mathematical Modeling
上传时间: 2014-01-08
上传用户:youth25
Specification for conveying ITU-R System B Teletext in DVB bitstreams
标签: Specification bitstreams conveying Teletext
上传时间: 2014-02-18
上传用户:mikesering
梯形公式计算面积近似值:In=Tn=h/2(f(a)+f(b)) 变长梯形面积:T2n=Tn/2+h/2∑f(Xk+h/2) 辛普生面积:I2n=(4T2n-Tn)/3
上传时间: 2016-01-06
上传用户:qw12
b tree code for index in the database design
标签: database design index tree
上传时间: 2016-02-03
上传用户:z1191176801