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第四届智能化农业信息技术国际学术会议

作者： Linlin ~1Qin Gang Wu~1 Jun Wang~1 Jing Li~1 Xiaojun Qiao~2 Weihong Luo~3 1 University of Science and technology of china Hefei 230027 china 2 National engineering research center for information technology in agriculture Beijing 100097 china 3 Nanjing Agricultural University Nanjing 210095 china

＜正＞Linear Auto-Regression Moving Average with extra input（ARMAx）model and Auto-Regressive Integration Moving Average with extra input （ARIMAx）model for air temperature system in a naturally ventilated greenhouse are developed. Outside air temperature and relative humidity,global solar radiation,and wind speed are used as disturbing input variables of the models,while inside temperature is used as output variable of the models. Statistic hypothesis test and model fits analysis are used together to select the model structure,and Gradually Oblivious Recursive Extended Least Squares（RELS）method is adopted to identify the model parameters on ***,an intelligent supervisory segment is devised to monitor and fix problems appearing during the on-line modeling *** were carried out in an experimental greenhouse to validate the *** is concluded that ARIMAx model with 4 input variables could be able to describe and predict the air temperature in the greenhouse reasonably well.

关键词： greenhouse air temperature system ARMAx model ARIMAx model on-line modeling RELS method

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混合场景绘制的光照一致性研究(英文)

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系统仿真学报 2009年第22期21卷 7176-7179,7184页

作者：高荣华尹宝才孔德慧司慧琳国家农业信息化工程技术研究中心北京100097 北京工业大学计算机学院多媒体与智能软件技术北京市重点实验室北京100124

光照计算是真实感图形绘制的重要的研究问题之一,调整光照效果是增强真实感效果最关键的一步,特别是在基于几何与图像混合绘制的系统中,调整图像的光照适应当前虚拟环境的光照是一个复杂的过程。利用三维模型在GPU中的绘制流程,在混合... 详细信息

光照计算是真实感图形绘制的重要的研究问题之一,调整光照效果是增强真实感效果最关键的一步,特别是在基于几何与图像混合绘制的系统中,调整图像的光照适应当前虚拟环境的光照是一个复杂的过程。利用三维模型在GPU中的绘制流程,在混合场景绘制系统中,提出了一种简单的光照一致性方法,生成虚拟场景绘制系统中动态光照下的图像模型,图像的光照随着虚拟光照环境的改变,与几何模型的光照具有一致性。

关键词：光照一致性混合绘制帧图像 GPU

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维普期刊数据库

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Improvement in an Interpolation Algorithm Concerning Multiple Factors to Predict Drift Distance

Improvement in an Interpolation Algorithm Concerning Multipl...

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第三届国际计算机及计算技术农业应用学术会议

作者： Wang Xiu~1 Ma Wei~1 Ji Jianbing~1 1 National engineering research center for information technology in agriculture 100097 Beijing Mao Yijin~(1 2) 2 china Agricultural University 100083 Beijing He Ming~3 3 University of Science and technology of Beijing Beijing 100097 china

＜正＞research on droplet drift distance is one important part of precision agriculture,there are many factors influencing drift distance such as environment conditions and physical property of droplets group. According to previous research results based on other agricultural experts,those factors involving temperature,relative humidity of environment,velocity of wind,droplet sizes,discharge height from nozzle and droplet initial velocity play an essential role in determining how far droplet drift *** Heping Zhu in Ohio State University have designed one quick method to predict droplet drift distance by assuming that each relations between those factors and drift distance is absolutely ***,error generating from assumption itself is obvious and it is entirely necessary to reduce any error caused by designed algorithm as much as *** analysis, such error could be reduced remarkably if partial improvement is made in Dr Heping Zhu’s interpolation *** this paper,relation between droplet size and drift distance is changed to be cubic because of its strong non-linear ***,we develop a software implemented with this new interpolation method,and then both of the results founded on the same but special combination of input variables are compared,and the result reveals that this new interpolation tally better with experiment data than the origin one and relative error based on those special combination of input variables are reduced obviously.

关键词： linear interpolation cubic droplet size drift distance VC++

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北京市农业用水问题及对策研究

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节水灌溉 2008年第12期 20-23页

作者：闫华赵春江郑文刚国家农业信息化工程技术研究中心农业部农业信息技术重点开放实验室北京100089

北京市为资源型重度缺水地区,水资源的需求量随着经济发展和人口的增长而骤增,供需矛盾日益加剧。农业用水是用水大户,接近全市用水的40%。水资源紧缺导致北京农业水资源严重不足,而农业用水浪费现象还普遍存在,节水农业是解决北京水资... 详细信息

北京市为资源型重度缺水地区,水资源的需求量随着经济发展和人口的增长而骤增,供需矛盾日益加剧。农业用水是用水大户,接近全市用水的40%。水资源紧缺导致北京农业水资源严重不足,而农业用水浪费现象还普遍存在,节水农业是解决北京水资源问题的重要途径之一。概述了北京地区的农业水资源的现状,阐述了北京农业用水特点,分析了农业用水中存在的主要问题,从优化种植结构、雨洪利用、农艺节水、工程节水以及管理节水等方面提出了农业节水的对策措施和建议。

关键词：水资源农业节水北京

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维普期刊数据库

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The Application of Dual Thresholds Binarization Algorithm for Pedestrian Segmentation in Thermal Imaging

The Application of Dual Thresholds Binarization Algorithm fo...

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2010 International Conference on Computer and Communication Technologies in agriculture engineering (CCTAE 2010)

作者： Guangyuan Zhang 1 2 1. School of information engineering Shenyang University Shenyang china Tong Shen 2 3 Wei Liu 2 Huai Yuan 2 2. Advanced Automotive Electronic technology research center Neusoft Corporation Shenyang china 3. College of Sciences Northeastern University Shenyang china

There is evidence that the major safety problem caused by darkness is the pedestrian collisions. Thermal Imaging systems can further reduce this risk. The image binarization is a preprocessing task, it play a very important role in pedestrian detection system. This paper applied the dual thresholds algorithm to process the thermal images for pedestrian segmentation. By a large number of experiments, we get the optimal combinations of the parameters of the algorithm, and get the good image binarization results of the thermal imaging.

关键词： thermai pedestrian segmentation binarization pedestrian detection

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基于物理的植物器官实时变形模拟

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系统仿真学报 2008年第24期20卷 6587-6591页

作者：陆声链赵春江郭新宇李长峰乔晓军国家农业信息化工程技术研究中心北京100097 上海交通大学数字农业实验室上海200030

近年来,各种方法被用来模拟可变形物体的实时变形。提出了一种基于质点-弹簧系统的植物器官变形模拟方法,并根据交互式设计的要求开发了参数化的植物器官几何造型和弹簧模型生成方法,简化了质点-弹簧模型的构造。实验结果表明,该方法能... 详细信息

近年来,各种方法被用来模拟可变形物体的实时变形。提出了一种基于质点-弹簧系统的植物器官变形模拟方法,并根据交互式设计的要求开发了参数化的植物器官几何造型和弹簧模型生成方法,简化了质点-弹簧模型的构造。实验结果表明,该方法能够获得具有较高真实感的变形效果,能够适用于多种植物器官一般情况下的变形模拟;同时,参数化的几何曲面和物理模型生成能够满足于交互式实时模拟的需要。

关键词：基于物理的模拟植物器官变形实时模拟

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维普期刊数据库

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KEY TECHNOLOGIES IN WSN-BASED COTTON FIELD SOIL MOISTURE MONITORING SYSTEM

KEY TECHNOLOGIES IN WSN-BASED COTTON FIELD SOIL MOISTURE MON...

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The Second IFIP International Conference on Computer and Computing Technologies in agriculture (CCTA2008)

作者： Ruirui Zhang1 Liping Chen 1 * Gang Xu1 Yanji Wang1 1 National engineering research center for information technology in agriculture Beijing P. R. china 100089

To level up the application of wireless sensor network in cotton field soil monitoring, wireless sensor network technology has been studied deeply. Some difficulties, including the design of soil moisture sensor, covering problem in wireless sensor network and diagnosis algorithm for wireless sensor networks and node, are been proposed and discussed. Combined with cotton field soil moisture monitoring application, coverage and deployment based not only on plane space but also on time are been discussed and a fault diagnosis algorithm based on entropy is been put forward in the article.

关键词： wireless sensor network field soil moisture monitor coverage algorithm fault diagnosis algorithms

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EXTRACTION OF BIOCHEMICAL COMPONENTS IN WINTER WHEAT BY CANOPY HYPERSPECTRUM

EXTRACTION OF BIOCHEMICAL COMPONENTS IN WINTER WHEAT BY CANO...

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Progress of information technology in agriculture

作者： Huang Wenjiang Wang Jihua Liu Liangyun Zhao Chunjiang Huang Muyi Wang JindiNational engineering research center for information technology in agriculture Beijing Post Code:100089 chinaresearch center for Remote Sensing and GIS Beijing Normal University Beijing Post Code:100875 china

＜正＞ Winter wheat canopy spectrum is affected by wheat canopy （leaf area index, leaf biochemical components, leaf angle distribution,canopy shadows, et al.）, soil, weeds, environment and their interactions. So the uncertainties for crop canopy spectral information become a fatal problem for the canopy biochemical and biophysical variables extraction. Recent studies have demonstrated the application of spectral indices from hyperspectral data for crop biochemical and biophysical variables. These indices are the compositive response to variations of several vegetation and environmental properties. Canopy chlorophyll content, an indicator of photosynthesis activity, which is related the nitrogen concentration in green vegetation and serves as a measure of the crop response to nitrogen application. The combination of NDVI and PRI can reduce the effect of LAI and soil background. The index （CCII） was proved to be sensitive to chlorophyll concentration and very resistant to the variations. This paper introduced the application of the ratio TCARI/OSAVI to make accurate predictions of winter wheat chlorophyll content under different varieties, and the application of SIPI for canopy biochemical indicators inversion by minimizing foliar inner structure effect. It indicated that the canopy chlorophyll content and nitrogen concentration could be evaluated by some new combination vegetation indices.

关键词： winter wheat canopy spectrum uncertainties information extraction

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ANALYSIS OF CONSTRUCTION OF RURAL information SERVICE SYSTEM IN THE WORLD

ANALYSIS OF CONSTRUCTION OF RURAL INFORMATION SERVICE SYSTEM...

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The 3rd International Symposium on Intelligent information technology in agriculture(ISIITA)

作者： Yunlong Zhao~(1,2) Xiangyang Qin~(1,3) Ailing Wang~4 ~1National engineering research center for information technology in agriculture,Beijing,100089,china ~2Institute of Agricultural Environment and Sustainable Development,Chinese Academy of agriculture Sciences,Beijing,100081,china ~3Bcijing Forestry University,Beijing,100083,china ~4Institute of Integrated Development of agriculture Beijing Academy of Agricultural and Forestry Sciences,Beijing,100089,china

＜正＞Based on the analysis of construction of rural information service system in china and other countries, the international experiences of construction of rural information service system were summarized,and the domestic problems of construction of rural information service system were discussed so that it can be used for reference to agricultural information construction in the future,and be helpful to solution of the problem of the last mile of rural information service.

关键词： rural information service system status quo experience problem

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Development and application of a novel crop stress and quality instrument

Development and application of a novel crop stress and quali...

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20th Congress of the International Commission for Optics

作者： Wengjiang Huang1 Gang Sun Jihua Wang Liangyun Liu Wengang Zheng National engineering research center for information technology in agriculture Beijing china Post address: P.O.Box 2449-26, Beijing, 100089, P.R.china

In this paper, a portable diagnostic instrument for crop quality analysis was designed and tested, which can measure the normalized difference vegetation index (PRI) and structure insensitive pigment

关键词： PRI NRI Portable optical instrument Crop quality

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