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亚洲精细农业与计算机农业应用联合大会

作者： Siyu Li Hongju Gao Jianzhao Jiang college of information and electrical Engineering china agricultural university beijing 1.0083 P. R. {5.

It will provide the foundation for researches on wireless sensor network deployment and power control to study the wireless channel propagation characteristics in cropland environments. In this study, the received signal power strength and the PLR （Packet Loss Rate） of 2.4GHz radio signals were measured in wheat fields at different growth stages. The transmission ranges of nodes were further attained, and then the path loss model was built through regression analysis using MATLAB. It can be observed that the attenuation speed of signal power monotonically decreases, and transmission range monotonically increases with the increase of antenna height, respectively. Therefore, the optimal height of antenna is about 1.2m, which is a little bit higher than mature wheat plants. The signal attenuation at later growth stages of wheat is larger than that at earlier stages when the antenna height is kept unchanged. In addition, 2.4GHz wireless channel loss in wheat fields could be predicted by the logarithm distance path loss model , and the correlation coefficients between computational values and measurement values are between 0.961 and 0.996. Path loss index decreases logarithmically with the increase of antenna height, and increases with the growth of wheat plants.

关键词： Wireless Sensor Network cropland environment propagation characteristics of wireless channel path loss transmission range

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A Survey of Stickiness of Agriculture Knowledge Acquisition in china

A Survey of Stickiness of Agriculture Knowledge Acquisition ...

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亚洲精细农业与计算机农业应用联合大会

作者： Weizhe Feng 1 Daoliang Li 2 Yanqing Duan 3 Zetian Fu 2 1 International college at beijing china agricultural university beijing P. R. china {5. 2 college of information and electrical Engineering china agricultural university beijing P. R. china {5. 3 Business School university of Bedfordshire Luton LU1 3JU UK

The concept of stickiness in this study was borrowed from information research literature, which indicated the complex and difficulties in all process of knowledge transfer that including knowledge acquisition. To reveal the stickiness of agriculture knowledge acquisition in china, a survey was conducted of agriculture related websites in china. Firstly, an intensive literature review was done for collecting attributes closely associated with agriculture knowledge and its acquisition process. Secondly, these attributes were cate- gorized and transformed into questionnaire and surveyed in 14 provinces in china. Thirdly, the data were tested with principal component analysis methods. As results, this study concluded that four factors that may affect the stickiness of agriculture knowledge, namely, difficulty, special tacitness, available explicitness, and proven knowledge;five factors that may affect stickiness of agriculture experts. They include attitudes, professional, expression capability, teamwork, and protectiveness;and five factors that may affect stickiness of agriculture institutions, attitudes, service orientation, distance, protectiveness, and professional. In conclusion, it was suggested that the three groups of principal factors can be used to guide the planning and assessment of ICT-based knowledge projects in rural areas. The study also highlighted a new area for ICT-based information and knowledge transfer research.

关键词： stickiness agriculture knowledge acquisition principal component analysis

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基于ArcXML和Winsock搭建WebGIS技术的研究

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武汉大学学报（理学版） 2005年第S2期51卷 180-182页

作者：盛政朱德海中国农业大学信息与电气工程学院北京100083

本文分析了基于ArcXML和Winsock来搭建WebGIS的技术原理,在此基础上提出了实现方法,并通过流程图的形式详细描述相关功能实现的过程,最后总结了该技术的特点以及相关应用方向.

关键词： ESRI ArcIMS ArcXML Winsock

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维普期刊数据库

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ANALYSIS AND MONITORING FOR EPIDEMIC SYSTEM AS A BASIS FOR CUCUMBER DOWNY MILDEW WARNING IN GREENHOUSE

ANALYSIS AND MONITORING FOR EPIDEMIC SYSTEM AS A BASIS FOR C...

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第四届智能化农业信息技术国际学术会议

作者： Chunjiang Zhao~~(1 2*) Ming Li~(1 3) Xiao Han~(1 2) Zheng Zhang~(1 2) Yan’an Wang~4 1 National Engineering Research Center for information Technology in Agriculture beijing 100097 PR china 2 Key Laboratory for information Technologies in Agriculture the Ministry of Agriculture beijing 100097 PR china 3 college of information and electrical Engineering china agricultural university beijing 1.0083 PR china 4 college of life science Shandong agricultural {15. Taian 271018 PR china

＜正＞Plant disease warning is a relative new concept and method system for integrated pest management. The basic of plant disease warning is epidemiology mechanistic and monitoring *** analysis of cucumber downy mildew epidemic has been proposed as the framework and criteria of early warning ***,a wide range of monitoring methods,including computer aids,for epidemic system provide foundation of establishing, operation and evaluation for early warning models. These results and approaches would prove useful in modeling and information system development for cucumber downy mildew warning.

关键词： Cucumber downy mildew greenhouse plant epidemiology monitoring epidemics waning

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RESEARCH AND DESIGN OF RURAL information SERVICE PLATFORM BASED ON SOA

RESEARCH AND DESIGN OF RURAL INFORMATION SERVICE PLATFORM BA...

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

作者： Jiang Zou Lu Yang* Ruizhi Sun college of information and electrical Engineering china agricultural university No. 17 Qinghua Dong Lu Haidian beijing 1.0083 {5.

The paper mentioned using SOA framework and the technology of Web Service, aiming at the problem of "information Isolated Island", specifically for rural information resources, an agricultural information service platform is constructed based on SOA and Web Service. This platform integrates distributed systems and service platforms and it deals with agricultural information by cooperative processing.

关键词： web service SOA information integration

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Dissolved Oxygen Prediction in Apostichopus Japonicus Aquaculture Ponds by BP Neural Network and AR Model

Dissolved Oxygen Prediction in Apostichopus Japonicus Aquacu...

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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： Feifei Li Daoliang Li~* Yaoguang Wei Daokun Ma and Qisheng Ding college of information and electrical Engineering china agricultural university beijing 1.0083 P.R.{5.

＜正＞In the process of rearing sea cucumber Apostichopus japonicus,Dissolved Oxygen（DO） concentration adjustment and control is the key point to sea cucumber *** paper proposed both traditional time series method（auto regressive（AR） model） and BP neural network for the DO concentration forecasting in sea cucumber aquaculture *** aim to make four different interval length（0.5.hour,1 hour and 2 hours） prediction of DO concentration in sea cucumber breeding *** DO concentration is the result of many factors,such as water temperature,solar radiation, water level,air temperature,PH and EC value of water,*** different factors have complicated nonlinear relations which are difficult to describe with simple mathematical formula. A BP neural network using water temperature,past time DO concentration and EC value as inputs to make 2 hours ahead DO concentration prediction was constructed in this *** model was also employed to forecast the DO *** show that predictive values of both models are accurate according to the observed *** AR model has better performance in short interval prediction and BP neural network does better in longer interval *** models demonstrated potential for use as an intensive aquaculture management and forecasting tool to predict the near-term DO concentrations.

关键词： DO Concentration Prediction BP Neural Network AR Model Sea Cucumber

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一种基于有限自动机的软件工作流开发模型

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计算机工程与应用 2004年第28期40卷 208-211页

作者：敖丽敏王树大郭永洪中国农业大学信息与电气工程学院东北电力学院信息工程系吉林132012 东北电力学院信息工程系中国农业大学经济管理学院

软件开发模型很多,基于Web的三层结构的软件设计开发模型的关键是要考虑它的并发性。文章提出了一种基于有限自动机的Web软件开发模型。该模型对有限自动机进行了扩充;将扩充后的有限自动机转换成为分层状态图;根据分层状态图转换成为... 详细信息

软件开发模型很多,基于Web的三层结构的软件设计开发模型的关键是要考虑它的并发性。文章提出了一种基于有限自动机的Web软件开发模型。该模型对有限自动机进行了扩充;将扩充后的有限自动机转换成为分层状态图;根据分层状态图转换成为多功能视图;在此基础上进行软件开发。利用这个开发模型可以方便地进行需求分析和描述;只需开发子服务组件或模块,便可进行软件开发、系统扩充以及后来的系统重构。

关键词：软件开发模型有限自动机软件工作流分层状态图重构

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维普期刊数据库

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Study and design of an agricultural SMS system based on a GSM modem

Study and design of an agricultural SMS system based on a GS...

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The First International Conference on Computers and Computing Technologies in Agriculture

作者： GANGHONG ZHANG~(1 2) WANLIN GAO~(1 *) XIU WANG~2 XINLAN JIANG~1 YANG PING~1 HONGQIANG YANG~1 1 college of information and electrical Engineering china agricultural university No.17 Qinghua Dong Lu Haidian beijing 1.0083 {5. 2 National Engineering Research Center for information Technology in Agriculture beijing 100097 {5.

＜正＞To allow agricultural information to be quickly and accurately transferred in the field,it is possible to utilise existing agricultural information resources through mobile phone messages transferred to *** paper describes an agricultural SMS system based on a GSM modem and its associated *** purpose of this study is to construct a short message service system that is capable of receiving and sending messages freely in rural areas. For this,we create a buffer queue able to receive and send short ***,we establish a separate data table able to communicate incoming and outgoing information to a higher agricultural information management *** this internet system,agricultural information is extracted;organised and communicated back to the farmer.

关键词： agricultural information ISMG GSM modem SMS

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Studies on Parameters of Loin-Eye Muscle of Hogs Carcass Using Image Processing Technology

Studies on Parameters of Loin-Eye Muscle of Hogs Carcass Usi...

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2005.中国农业工程学会学术年会

作者： Zheng Limin1 Yubo1 Ren Fazheng 2* Zhu Hong Tian Li Jun (1 college of information & electrical Engineering 2college of Food Science & Nutritional Engineering, china agricultural university, {5. china,1.0083)

Area and fat content of loin-eye muscle, marbling and color of pork are important parameters of pork quality. The digital camera was adopted in this study to obtain the loin-eye muscle image of 30 hug

关键词： image processing technology area of loin-eye muscle features of color and texture region-growing

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Allocation and Scheduling of Relief Materials based on GIS

Allocation and Scheduling of Relief Materials based on GIS

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2011 IEEE International Conference on Spatial Data Mining and Geographical Knowledge Services(ICSDM 2011)

作者： Xiaohui Su~(#*1) Xiaodong Zhang~(+2) Sanchao Liu~(#*3) Siquan Yang Jianyu Yang Yanqing Chen Jingyu Xu # college of information and electrical Engineering china agricultural university No.17 Tsinghua East Road beijing 1.0083 P.R.{5. * National Committee Disaster Reduction Ministry of Civil Affairs of the People’s Republic of {5. beijing P.R.{5. +college of information and electrical Engineering china agricultural university No.17 Tsinghua East Road beijing 1.0083 P.R.{5.

＜正＞The losses caused by natural disasters are increasing, especially in 21st century,the security and the losses increased. Responding natural disasters and reducing losses become an urgent task which facing all of *** paper will propose an allocation method of relief materials for pre-disasters and a shortest-time and potential-considered scheduling model for *** allocation method for relief materials considers service areas of the storehouse along roads and risk level of natural *** scheduling model combines the basics of operation research and shortest path based on *** methods based on GIS can directly show the distribution and the routes for *** the paper will make an example against the backup of Wenchuan earthquake according to the current problems in order to relief the losses.

关键词： allocation of relief materials scheduling model GIS natural disasters service area of storehouse

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