简介:当前PLC技术、CAD/CAM技术和工业机器人已成为工业生产自动化的三大支柱。因此在机床电气控制中加强PLC控制过程的教学,或单独开PLC课程,已成为机械工业学校或自动化专业教学中的必然趋势。PLC是一门实践性很强的技术,而弄清PLC编程原理又是掌握PLC控制技术的基础和重要途径。现就自己的编程教学实践谈一点体会。我校教学用的PLC是日本松下电工公司生产的FP1系列可编程控制器,实验室中有FP1——C24、FP1-C40和FP1-C72三种规格。编程时采用的是松下专用软件NPST-GR3.1中文版软件,该软件提供了三种编程方式:符号梯
简介:AbstractPurpose:Child injuries are a public health concern globally. Injury surveillance systems (ISSs) have beneficial impact on child injury prevention. There is a need for evidence-based consensus on frameworks to establish child ISSs. This research aims to investigate the key components of a child ISS for Iran and to propose a framework for implementation.Methods:Data were gathered through interview with experts using unstructured questions from January 2017 to December 2018 to identify child ISS functional components. Qualitative data were analyzed using content analysis method. Then, modified Delphi method was used to validate the functional components. Based on the outcomes of the content analysis, a questionnaire with closed questions was developed and presented to a group of experts. Consensus was achieved in two rounds.Results:In round I, 117 items reached consensus. In round II, 5 items reached consensus and were incorporated into final framework. Consensus was reached for 122 items comprising the final framework and representing 7 key components: goals of the system, data sources, data set, coalition of stakeholders, data collection, data analysis and data distribution. Each component consisted of several subcomponents and respective elements.Conclusion:This agreed framework will assist in standardizing data collection, analysis and distribution, which help to detect child injury problems and provide evidence for preventive measures.
简介:[目的]应用Delphi法构建手术室术前访视工作模式,以实现术前访视工作规范化、系统化,为手术室实施术前访视工作提供参考依据。[方法]根据研究主题确定咨询专家人选,采用Delphi法对23名专家进行2轮问卷调查,问卷最后设置开放性问题,进一步了解专家对表中未提及内容的意见和建议。[结果]专家组成员大部分具有副高以上职称,工作年限24.55年±14.08年;两轮咨询问卷回收率均高于80%,专家权威程度均为0.89;根据设定的重要性得分均数和变异系数标准筛选出符合要求的指标30项,构建一套规范的术前访视的工作模式,主要包括:术前访视的执行者、术前访视的时间、术前访视的内容、术前访视的方式、术前访视的对象5个主要部分。经过两轮咨询后,专家协调系数为0.22,差异具有统计学意义(P〈0.05)。[结论]专家代表性强,积极性高,权威程度、协调性较好,此次Delphi法筛选出的指标符合构建术前访视工作模式的需要。
简介:摘要为了更加准确的查找某些可再生资源工厂中所存在的危险有害因素并确定危险等级的大小,本文主要从事故系统中人的角度对金属资源可再生工厂中的生产工艺以及管理方面中的危险因素进行分析研究。采用Delphi-AHP层次分析法,结合金属资源可再生工厂的相关数据对整个工厂的管理现状进行评价。首先利用Delphi-AHP法计算相关指标的权重,并与判断矩阵逐层加权进行模糊计算得到结果,根据结果对工厂中的危险有害因素提出整改措施。