1,721,826 research outputs found
ISO 11783 Network Technology Research on Agricultural Machinery Bus
No full textISO 11783标准是应用于农业森林机械的串行网络通信协议,采用CAN2.0B为基础,支持实时数据通信、操作员与ECU在线交互功能等,并且兼容J1939协议。本文介绍ISO 11783标准的背景、结构、组成和编码规范及技术特点
Research on test platform of ISO 11783 Data Link Layer software
No full text为了实现ISO 11783数据链路层软件的自动测试,本文规划了ISO 11783数据链路层软件的测试方案,并搭建测试操作平台。实验表明,按照所设计的测试流程,系统可以对ISO 11783数据链路层软件进行有效的自动测试
Programmable logic controller applied to operational functions in agricultural implement based on ISO 11783 standard / Controlador lógico programável aplicado às funções operacionais de um implemento agrícola baseado na norma ISO 11783
Get PDFISO 11783 standard is supported by the Agricultural Industry Electronics Foundation (AEF) with the aim to promote the compatibility between agricultural products from different manufacturers. Several studies have been used it to develop automation for tractor-implement in industry. The main objective of this paper is to describe an application of ISO 11783 standard for a sprayer with the implementation of a Programmable Logic Controller (PLC). PLC was used as an electronic control unit to provide the integration between the sprayer control and the operator-user by means a universal terminal installed on a tractor. The ISOAgLib was used due its compatibility with the standard. The elements of the universal terminal were designed according to the ISO 11783 standard for agricultural operations of a sprayer. Some essential programming routines and computational tools were implemented based on the ISO 11783 standard that allowed its implementation for an agricultural application
ISOBUS – eine systematische Betrachtung der Norm ISO 11783
No full textISOBUS-Systeme sind Anwendungen der ISO 11783. Diese Norm regelt Kommunikation und Schnittstellen für die geräteübergreifende elektronische Verbindung, Steuerung und Bedienung von Komponenten in Traktoren und Arbeitsmaschinen. Der Beitrag gibt einen systematischen Überblick über die Funktionen des komplexen Normenwerks
Specification, Design and Evaluation of an Automated Agrochemical Traceability System
Get PDFTraceability through all the stakeholders in food production is an issue of increasing
importance, being specifically required by the regulations for food safety and quality
(EC 178/2002), and for compliance with environmental protection. The agricultural
market perceives a need for systems and technologies to automate the currently manual
process of producing records of agrochemical inputs loaded into a spraying machine.
A novel prototype Automated Agrochemical Traceability System (AACTS) to identify
and weigh agrochemicals as they are loaded into crop sprayer has been designed,
constructed, fitted to a machine and evaluated with commercial operators. The
functional blocks of the system are a 13.56 MHz RFID reader, 1.4 litre self cleaning
weighing funnel mounted on a 3 kg load cell, a user interface with a screen and three
user command buttons (Yes, No, Back), and a progress bar made of 8 coloured LED’s
(green, amber, red). The system is able to trace individual agrochemical containers,
associate the product identity with national agrochemical databases, quantify the
required amount of product, assist the sprayer operator and control workflow, generate
records of sprayer inputs and interoperate with (recommending extensions to) task
management standards as set out in ISO 11783-10.
The evaluation of the quantity weighing has demonstrated that with such a system, the
principal noise component is in the range of 33–83 Hz, induced by the operating tractor
engine. A combined 3 Hz low pass digital filter with a second stage rolling mean of 5
values improves performance to allow a practical resolution of 1 gram (engine switched
off) to 3.6 grams (sprayer fully operational) with a response appropriate to suit human
reaction time. This is a significant improvement over the ±10 grams of the work of
Watts (2004).
An experiment with 10 sprayer operators has proved that in the majority of cases (92%)
an accuracy equal or better than ±5% is achieved regardless of dispensing speed. The
dispensed amounts (100.36% of target) and recorded (100.16%) are in accordance with
prescribed values (100%; LSD(5%) 2.166%), where amounts dispensed by manual
methods (92.61%) differ significantly from prescribed and recorded value (100%). The
AACTS delivers a statistically similar work rate (211.8 s/task) as manual method
(201.3 s/task; Δt = 10.5 s/task; LSD(5%) 28.2 s/task) in combined loading and recording
cycle. Considering only the loading time (181.2 s/task) of manual method, the
difference is 30.6 s/task (LSD(5%) 30.1 s/task). In practice this difference is believed to
be marginal compared to the time required to load the water, random external events
during the spraying session and in time moving, checking and storing paper records.
The integrated weighing funnel concept is another significant improvement over
previous work. Using this system, the mean duration of measuring per container for all
tasks (34.0 s) is approximately half the time (68.5 s) achieved by Watts (2004). The
AACTS was rated to be safer than the manual method regarding operator health and
safety and risk of spillage. All operators who evaluated the AACTS were interested in
purchasing such a system.
The work confirmed that an RFID system was an appropriate media for agrochemical
identification performing more than 250 product identification operations during
operator tests without failure, with a speed of operation <1 s per cycle and reading
distance of 100 mm. A specific format for RFID tag data is proposed for adoption, using
low cost tags, that combines item level traceability with identification of products
independently without access to worldwide databases.
The AACTS follows ISO 11783 task management logic where a job is defined in a
prepared electronic task file. It is proposed to extend the ISO 11783-10 task file to
integrate the records provided by AACTS by handling the tank loads as individual
products resulting from loading task and allocating them to spraying tasks.
It is recommended to produce a production prototype following the design
methodology, analysis techniques and performance drivers presented in this work and
develop the features of user interface and records of tank content into software for ISO
11783-10 cabin task controller to deliver business benefits to the farming industry. The
results with RFID encourage the adoption of RFID labelling of agrochemical containers.
The reader may wish to read this thesis in parallel with Gasparin (2009) who has
considered the business and industry adoption aspects of the AACTS
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Get PDF“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Get PDFWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Research&Implementation of ISO 11783 Network for Agricultural Machinery
No full text随着网络技术的发展与渗透以及精准农业的要求，农机产品信息化、智能化的要求日益迫切。国际标准化组织ISO有针对性地制定了农机总线ISO 11783串行控制通信网络标准。ISO 11783总线标准参考了欧洲的农机总线标准DIN9684和美国的汽车电子技术标准SAE J1939协议制定，具有很好的针对性和专门性。ISO 11783是基于CAN2.0B的，这保证了其高实时性、高可靠性，低误码率和强大的错误发现和处理能力。典型的基于ISO 11783协议的农机网络包括两个网段：工具总线网段和拖拉机总线网段，本文的重点是工具总线网段。本文从ISO11783协议入手，分析其体系结构并介绍其组成；讨论其网络层次模型和网络结构，着重于其数据链路层和网络管理部分的研究和实现；给出协议的测试方案，最终设计并实现该系统。论文第1章结合当前农业中精准农业的提出和对农机产品的新需求介绍ISO11783的背景和应用范围。第2章详细讨论相关协议及其网络的体系结构，包括CAN总线协议，ISO11783和SAEJ1939协议。第3章介绍其硬件环境和实现平台以及系统的概览。第4章以软件工程思想为指导结合协议描述ISO11783的数据链路层和网络管理的实现。第5章介绍协议的测试方案以及测试系统的构建以及相应上位机软件的编写。最后给出结论，对本文进行归纳总结和对未来工作进行展望。该协议栈已经成功应用 “大马力轮式拖拉机信息化智能化系统项目中”
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