视频图像编码的现状与发展

本文介绍了静态和运动图像压缩编码国际标准的发展过程中出现的一系列标准,特别是JPEG2000、MPEG-4以及H.264,总结了这些国际标准的压缩效果、应用场合及相应的压缩编码算法,分析讨论了这些新标准的特点和优越性。     

温室大棚无线温湿度监测装置的设计

设计了一种无线温度、湿度监测装置,该装置通过一体化温湿度传感器SHT11对温室大棚内温度、湿度进行采集,然后将采集到的数据按照协议通过无线模块发送出去;接收方接收到数据后解包,计算出温度、湿度值并显示在液晶屏上。该系统发射部分以AT89C2051为内核,包括温度、湿度采集模块和无线发射模块;接收部分以AT89S52为核心,将无线接收,液晶显示等模块结合起来,通过软、硬件抗干扰处理,设计出的实用、小型的无线监测温度、湿度装置可广泛应用到温室、粮仓等场合中。     

禽舍内环境湿度无线监测装置的设计

设计了一种禽舍内无线湿度监测装置,发射机通过湿度传感器HS1101对湿度进行采集,将采集到的数据通过无线模块PTR2000发送,接收机计算出湿度值,并在液晶屏上显示。系统发射部分以AT89S52为核心,包括湿度采集和无线发射。接收部分也以AT89S52为核心,包括无线接收和液晶显示。系统具有测量精确、简单实用和小型化的特点,满足禽舍湿度监测的实际要求。     

基于ORYZA2000模型的旱稻生长模拟及氮肥管理研究

以旱稻田间试验资料为基础，对水稻生长模拟模型ORYZA2000模拟旱稻生长进行参数校正和验证，图解和回归分析结果显示ORYZA2000模拟旱稻生物量、产量、作物吸氮量的模拟值与观测值基本呈线性关系，模拟效果良好，但对土壤水分的模拟效果欠佳，需做进一步研究。应用校正和验证的结果，结合肥料效应函数原理，对旱稻不同灌溉方式和密度管理下的氮肥经济最佳施肥量做了探讨，初步得出了该地区旱稻栽培氮肥经济最佳施肥量，丰富了作物模拟和节水农业的理论和实践，对以后旱稻发展及栽培管理有一定的参考价值。     

Evaluation of Water–Nitrogen Schemes for Rice in Iran,Using ORYZA2000 Model

The model ORYZA2000 simulates the growth and development of rice under conditions of potential production and water and nitrogen (N) limitations. Crop simulation models could provide an alternative, less time-consuming, and inexpensive means of determining the optimum crop N and irrigation requirements under varied irrigation and nitrogen conditions. Water productivity (WP) is a concept of partial productivity and denotes the amount or value of product over volume or value of water used. For the evaluated ORYZA2000 model in Iran, a study was carried out in a randomized complete block design between 2005 and 2007, with three replications at the Rice Research Institute of Iran, Rasht. Irrigation management (three regimes) was the main plot and N application (four levels) was the subplot. In this study, simulation modeling was used to quantify water productivity and water balance components of water and nitrogen interactions in rice. Evaluation simulated and measured total aboveground biomass and yield, by adjusted coefficient of correlation, T test of means, and absolute and normalized root mean square errors (RMSE). Results showed that with normalized root mean square errors (RMSE_n) of 5–28%, ORYZA2000 satisfactorily simulated crop biomass and yield that strongly varied among irrigation and nitrogen fertilizer conditions. Yield was simulated with an RMSE of 237–443 kg ha^?1 and a normalized RMSE of 5–11%. Results showed that the significant (28–56%) share of evaporation into evapotranspiration, using the actual yield (measured) and simulated water balance (ORYZA2000), the calculated average WP_ET was significantly lower than the average WP_T: 37%. The average WP_I, WP_I+R, WP_ET, WP_T, and WP_ETQ were 1.4, 1.07, 1.07, 1.57, and 0.82 kg m^?3. Results also showed that irrigation with 8-day intervals and 60 kg N ha^?1, nitrogen level was the optimum irrigation regime and nitrogen level.     

基于局域网的数据库文件备份

Oracle、SQL Server、MySQL是中小型企事业单位常用的三种数据库,数据库的备份和恢复至关重要;数据库文件的备份有很多种方法,本文主要介绍了如何将它们的数据库文件导出并自动备份到局域网内其它计算机上,同时介绍了Ghost、WinRAR等软件在数据库文件备份中的应用.     

论过程方法在生产企业内外部审核中的应用

本文介绍了过程方法及在生产企业内外部审核的具体应用,中国企业在做ISO9001内外部审核时基本上是以部门为主线,但在建立体系及审核时如用过程方法效果会更好。本文从过程方法介绍,企业的内外部审核概述,过程方法在内外部审核中的应用展开详细阐述了怎么去应用过程方法。     

一种高效低功耗JPEG2000小波变换器的设计

提出了一种高效低功耗的JPEG2000小波变换器的硬件结构,减小了二维离散小波变换器(2-D DWT)中暂存器的大小,降低了存储器的平均访问带宽,有效减小了芯片的面积和功耗.整个设计通过了FPGA验证,并采用HJTC 0.18μm工艺库进行了芯片设计.试验结果表明,片内暂存器的面积和功耗比普通方法分别减小了54.5%和61.4%.