Learning LOGO: effects on learning BASIC and statistics

Abstract Two experiments were conducted to examine the effects of a period of training in the use of the turtle graphics aspects of LOGO on both attitudes towards computers and the learning of BASIC and statistics. A group of 15 subjects spent 10 hours learning LOGO . Their performance on subsequent learning of BASIC was significantly better than that of a control group, but no differences were found in attitudes towards computers or in the learning of statistics.     

How do children do mathematics with LOGO?

Abstract  This paper considers some results of a study designed to investigate the kinds of mathematical activity undertaken by children (aged between 8 and 11) as they learned to program in LOGO. A model of learning modes is proposed, which attempts to describe the ways in which children used and acquired understanding of the programming/mathematical concepts involved. The remainder of the paper is concerned with discussing the validity and limitations of the model, and its implications for further research and curriculum development.     

基于LOGO!的空气过滤器自洁控制系统

为进一步提高自洁空气过滤器控制系统的安全、可靠性,引入了西门子可编程逻辑控制器LOGO!,实现了多台空气过滤器的自洁控制,经实际使用,效果良好。     

采用LOGO!的一种联锁逻辑控制系统

介绍了运用西门子公司的LOGO !实现的一种联锁逻辑控制系统 ,阐述了系统的硬件组成及软件编程     

Teachers' use of software for pupils with specific learning difficulties

Abstract Previous research in the USA suggests that teachers use mainly drill and practice software programs to support reading problems for pupils with specific learning difficulties (SpLDs). More recently, holistic and active learning approaches have led to wider use of content free software. A small scale study was undertaken to explore teacher's use of software in supporting pupils' learning. The approach used questionnaires for 56 teachers and interviews for nine of those teachers who had responded. The teaching approach used by teachers was related to the type of software that they used (64 programs were identified). The software was categorised into 'drill and practice' and framework groups. The teachers who used whole book approaches to teaching preferred framework software. Teachers using structured approaches made more use of drill and practice software but also used framework software.     

Ways of learning in a computer-based environment: some findings of the LOGO Maths Project

Abstract  This paper is derived from the LOGO Maths Project's investigation of the potential of LOGO in the secondary school mathematics classroom (1983–1986). The main focus of the work has been to discover whether and under what conditions the computer language LOGO can be used as an aid to pupils' learning and thinking in mathematics. Longitudinal case studies were undertaken for four pairs of pupils throughout the three years of the project. In addition the research was extended for two years into another eight schools. This paper presents the findings concerned with peer collaboration and the role of the teacher in the LOGO environment. It describes how LOGO work can be used to gain insights into pupils' conceptions of mathematical ideas. It also makes reference to gender issues in the wider context of computer use in the United Kingdom.     

Design of a microcomputer-based LOGO turtle interface

An Intel 8035 microcomputer-based system which interfaces a LOGO turtle robot drawing device to an asynchronous serial communications line is described. The system was required to receive and interpret commands and to control the turtle wheels, pen mechanism and hooter in obedience to commands. The use of a microcomputer made it possible to simplify the turtle mechanism, improve the drawing accuracy and minimize the number of components used in the interface.     

西门子LOGO在机场行李值机输送单元中的应用

介绍以西门子LOGO为控制核心的机场值机输送单元控制系统的组成、硬件配置、控制流程及软件实现.     

LOGO!在空压机控制系统中的应用

本文介绍了LOGO!在空压机控制系统中的应用,给出了由一台自耦变压器控制两台空压机起动的控制电路。此法是一种经济,实用的控制方法,系统具有高可靠性,经实际应用,效果良好。     

The strategies and interactions of young children in LOGO tasks

Abstract  The present study analysed the strategies and interactions of 60 7-year-old children working on LOGO tasks in gender pairs (girls, boys and boy/ girls). The results revealed that initially there were significant differences on some performance variables, based on gender, in one of the tasks. However, these disappeared when the task was changed to one with a focus on accuracy. By the end of the study differences in performance were found to be associated with the application of higher order strategies for problem-solving. The research investigated the nature of the early differences between the groups by examining the strategies and interactions of the pairs of children. The study highlights the importance of considering both the type of task and performance over a reasonable period of time when describing the nature and extent of young children's learning when problem solving in a novel environment.     

基于西门子LOGO!的洗衣机自动控制系统设计

西门子LOGO!是介于PLC和继电器之间的可编程逻辑控制器,它适应控制技术市场细分的趋势,简单灵活,易于设计、维护。采用西门子LOGO!作为全自动洗衣机的控制器,对整个系统进行了创造性的设计,方便了职业教育的控制技术教学,也为LOGO!步入洗衣机控制领域做出了有益的尝试。     

An alternative characterization of weak order dependence

Control dependence forms the basis for many program analyses, such as program slicing. Recent work on control dependence analysis has led to new definitions of dependence that can allow for reactive programs with their necessarily non-terminating computations. One important such definition is the definition of Weak Order Dependence, which was introduced to generalize classical control dependence for a Control Flow Graph (CFG) without end nodes. In this paper we show that for a CFG where all nodes are reachable from each other, weak order dependence can be expressed in terms of traditional control dependence where one node has been converted into an end node.     

西门子LOGO!在汽车试验场交通灯系统中的应用

阐述以西门子LOGO!为控制核心的交通灯控制系统的组成、硬件配置、控制流程及软件实现。     

嵌入式技术推动工控网络化发展及应用

嵌入式技术在芯片集成、系统开发、网络技术、异构集成等方面的巨大进展对工业测控领域中的网络化控制、监测等产生了革命性的影响。本文阐述了伴随嵌入式技术的进步,工控设备智能化、网络化的发展以及对工业控制系统的相互作用和影响,说明了以嵌入武技术为基础的工控网络发展趋势;指出了基于高集成微处理器及强实时性嵌入武操作系统的开发技术是工控设备专业化、系统化革新的基础;并进一步阐述了基于嵌入式技术的异构网络集成,以及网络控制系统带来的问题和对嵌入式技术的期望。     

西门子S7-414H冗余DCS系统在稻谷加工中的应用研究

本文以五粮液集团稻谷加工冗余DCS系统为例，介绍了冗余技术在粮食加工控制系统中的应用，并从CPU冗余、通信冗余和软件编程三方面进行了详细的论述。作者提出了一套可行的硬件设计方案，将双路冗余工业以太网改造成冗余环网，进一步提高了系统的可靠性；设计了一套在复杂工艺编程时，便于调试的程序结构。     

Online teaching and technological affordances: An experimental investigation into the impact of modality and clarity on perceived and actual learning

Online courses have become commonplace at many institutions of higher education. While the popularity on online courses is growing, there are still many questions regarding the effectiveness of such courses in facilitating learning outcomes. Using theories from mass communication and education, we designed an online lecture which employed a 2 (modality) × 2 (clarity) between-subjects factorial design to better understand how variations in the mode (text only; audio and text) and structure/clarity (high clarity; low clarity) of information impacted feelings of instructor closeness, credibility, and perceived and actual learning. Results indicated that online lectures presented in a multimodal format were better at facilitating positive student experiences with instructors, as well as perceived and actual learning than lectures that contained only one mode of information. Implications of these findings are discussed with a specific focus on instructional design and technology.     

高校非计算机专业C语言教学改革与实践

针对高校非计算机专业C语言教学过程中存在的C语言抽象、知识点多与教学时间不足等问题,分析了高校非计算机专业学生学习C语言的特点,阐述"以指针为核心,以实验为手段,突出程序设计思想和方法"的教学理念。     

Researching professional learning

Abstract This paper draws on recent research which includes the JITOL project, funded through the EC DELTA programme, and a current ESRC project on teachers' professional culture. It identifies a typology of contexts in which professional learning might take place. This typology was a product of the evaluation of the JITOL project and seeks to identify the learning which grows out of occupational environments. It problemetises the notion of 'professional', arguing that the term refers to a set of values which frame occupational practice and thus learning. Finally, it offers an approach which might form the basis of research into professional learning.     

白土下料配比控制系统的实现

本文介绍了下白土系统改造的原因，提出了利用可编程控制器实现下料配比控制的方案，并对实施过程中参数转换进行详细介绍。控制系统投用后，效果较好。     

具有误差变化率校正的预测控制算法

提出了一种模型算法控制的改进算法。它在输出预测算式中增加了误差变化率校正项,使输出预测具有预测误差将来变化的能力,从而使MAC算法克服干扰的能力增强。仿真结果表明了该改进算法的优越性。