农业古籍断句标点模式研究

农业古籍的整理已经引起了众多学者和专家的注意,但是,对于农业古籍的自动断句、标点模式的研究仍付之阙如。本研究探索并总结出部分农业古籍断句、标点识别模式。首先采用句法特征词断句法、同义语标志词法进行初步断句;进而利用反义复合词、引书标志、时序、数量词、重叠字词、动名结构及比较句法进一步对子句进行断句、标点;最后使用农业用语和禁用模式表进一步提高断句、标点后农业古籍的可读性和准确性。经测试表明,断句、标点的平均准确率分别达到48%和35%,证明本方法具有一定的正确性和可行性。     

Monitoring agricultural drought for arid and humid regions using multi-sensor remote sensing data

While existing remote sensing-based drought indices have characterized drought conditions in arid regions successfully, their use in humid regions is limited. We propose a new remote sensing-based drought index, the Scaled Drought Condition Index (SDCI), for agricultural drought monitoring in both arid and humid regions using multi-sensor data. This index combines the land surface temperature (LST) data and the Normalized Difference Vegetation Index (NDVI) data from Moderate Resolution Imaging Spectroradiometer (MODIS) sensor, and precipitation data from Tropical Rainfall Measuring Mission (TRMM) satellite. Each variable was scaled from 0 to 1 to discriminate the effect of drought from normal conditions, and then combined with the selected weights. When tested against in-situ Palmer Drought Severity Index (PDSI), Palmer's Z-Index (Z-Index), 3-month Standardized Precipitation Index (SPI), and 6-month SPI data during a ten-year (2000-2009) period, SDCI performed better than existing indices such as NDVI and Vegetation Health Index (VHI) in the arid region of Arizona and New Mexico as well as in the humid region of North Carolina and South Carolina. The year-to-year changes and spatial distributions of SDCI over both arid and humid regions generally agreed to the changes documented by the United States Drought Monitor (USDM) maps.     

农业搜索引擎中文分词工具对比

中文分词是中文语言处理技术中最关键的部分,被作为其中最重要的预处理手段广泛应用.本文主要分析和比较了ASPSeek、ICTCLAS、Paoding、MMseg、IK与JE六种分词工具对农业搜索引擎的影响.结果表明:在农业搜索引擎的应用效果中,分词准确性最优的是ICTCLAS分词工具,而F1测度最高的是JE分词工具.     

基于Android的农产品质量安全监管软件

面向政府监管部门人员快速查询农产品质量信息和及时将巡查工作信息化登记的需求,开发了基于Android的农产品质量安全监管软件.介绍了农产品质量安全监管软件的功能模块,创建了Android客户端和服务器的系统架构,重点设计了客户端界面,研究了数据读取和写入的关键技术.该软件在江苏省泰州市农业监管系统应用,运行效果稳定有效,达到预期要求.     

3D‐vision based detection,localization, and sizing of broccoli heads in the field

This paper describes a 3D vision system for robotic harvesting of broccoli using low‐cost RGB‐D sensors, which was developed and evaluated using sensory data collected under real‐world field conditions in both the UK and Spain. The presented method addresses the tasks of detecting mature broccoli heads in the field and providing their 3D locations relative to the vehicle. The paper evaluates different 3D features, machine learning, and temporal filtering methods for detection of broccoli heads. Our experiments show that a combination of Viewpoint Feature Histograms, Support Vector Machine classifier, and a temporal filter to track the detected heads results in a system that detects broccoli heads with high precision. We also show that the temporal filtering can be used to generate a 3D map of the broccoli head positions in the field. Additionally, we present methods for automatically estimating the size of the broccoli heads, to determine when a head is ready for harvest. All of the methods were evaluated using ground‐truth data from both the UK and Spain, which we also make available to the research community for subsequent algorithm development and result comparison. Cross‐validation of the system trained on the UK dataset on the Spanish dataset, and vice versa, indicated good generalization capabilities of the system, confirming the strong potential of low‐cost 3D imaging for commercial broccoli harvesting.     

新时期云南农业经济发展战略的思考

新世纪中国经济发展的第二步战略目标已经实现 ,中国经济发展进入新的阶段 ,国家开始实施西部大开发战略。云南农业经济的发展如何适应新形势、抓住机遇 ,这是制定农业经济发展战略必须考虑的因素。作者依据当前社会、经济发展的时代背景 ,结合云南农业经济的现状 ,试图对云南农业经济发展战略及其重点的选择等问题进行探讨     

我国农业机械化评价指标体系设置研究

农业机械化指标体系的准确设置和正确运用将有助于评价标准的统一性 ,便于使用同一的计量尺度计算和分析农业机械化的作用效果 ,评价农业机械化发展水平。本文通过对农业机械化评价指标体系的属性、功能以及量化标准的理论研究与分析 ,提出了构建我国农业机械化评价指标体系框架的初步设想     

运城地区可持续发展农业工程信息资料检索系统研究

采用 Win95操作系统 ,以 VB为开发工具 ,对运城地区农业工程信息进行快速检索并长期存储。该系统成本低、实用性强 ,人机交换界面使用方便 ,不需专业培训 ,为大型农业建设工程信息资料的检索和存储开辟了一条新的途径     

A socioeconomic model for managing water resources in Alicante,southeast Spain

The study analyzes variables that influence the water management model based on a simultaneous relationship between competing demands in the Marina Baja of Alicante, using a methodology that directly links together urban and irrigation demands, making them relevant to each other from a socioeconomic point of view. The paper identifies the relevant variables of this model and the agent behaviour in a closed and joint system. It also aims to demonstrate that by considering water demands for different yet simultaneous uses and regarding clean and reclaimed waters as integrated resources, the system could remain in equilibrium without external water supplies.     

水利对粮食生产贡献率的认识与思考

针对目前很多人对农业科技进步贡献率和水利对粮食生产贡献率的不同认识,从发展历程、概念内涵、测算思路方法等方面,剖析了二者差异,认为二者在测算范围上存在大口径与小口径的差异,在测算对象上存在增量与总量的差异,在测算指标上存在产值与产量的差异,在测算方法上存在余值法与有无对比法的差异,为正确认识这两个指标提供了参考。