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郑三婷 《电子制作.电脑维护与应用》2019,(12)
温度监测是日常生活、医学、环境保护等领域最普遍的监测对象,其中,对于人体温度的监测更为重要。体温计是医疗器械中最平常、使用最广泛也是必不可少的一种小型仪器,用于对人体温度的测量。利用单片机和DS18B20温度传感器相互组合,配备其他相关的电路模块,可以制作电子温度计,可用于直接测量各个部位的温度,从而直观准确地可以得到所测部位的温度。电子体温计在实际应用中,不仅易于操作,而且测量结果直观准确。所以,利用温度传感器结合单片机所制作的电子体温计在日常生活中具有很好的市场需求。 相似文献
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设计了以三菱PLC FX2N-16MT作为控制核心,以步进电机作为执行元件,驱动电子体温计检定机构,配合计算机CCD图像采集处理系统,实现电子体温计的在线高速高效检定.检定过程包括电子体温计装卸、温度测量、CCD图像采集、测量温度比对、检定结果报表输出五个步骤. 相似文献
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铭 《电子制作.电脑维护与应用》2008,(1):10-10
体温计是人们日常生活中的必备品。传统的水银体温计存在测温时间长、读数不便等缺点。本文介绍的电子体温计采用89S52单片机控制、数字温度传感器DS18820测温、122×64点阵液晶屏显示。使用方便、读数直观。其显示精度为0.1℃。当温度处在35℃~40℃度之间时,还可在显示的温度值后面加低体温、正常、低热、超高热等友情提示。因该体温计的温度测量范围为-55℃~125℃,所以,还可用于其他温度的测量。 相似文献
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《电子制作.电脑维护与应用》2015,(13)
本文根据NTC的温度特性提出一种由测温电桥、放大电路以及AD转换模块构成的数字体温计的设计。相对传统水银体温计相比响应时间更快,与现有的温度传感器相比精度更高,同时为智能医疗的体温测量提供了一种解决方案。 相似文献
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基于平面网格模型的摄像机镜头畸变校正技术 总被引:6,自引:0,他引:6
摄像机标定技术是计算机视觉研究中的关键技术之一。国内外学者开展了大量的研究并取得了大量的研究成果。目前,摄像机标定技术的主要研究任务在于根据实际应用的特点,寻找简便、快捷、准确的标定算法。该文针对精密视觉测量这一特殊应用领域,提出了基于平面网格模型的摄像机镜头畸变校正技术。除了考虑镜头的径向畸变之外,还包括离心畸变、薄凌镜畸变等非线性因素,在镜头中心附近小区域零畸变的假设条件下,推导出网格交点的理想坐标,并由图像处理技术获得网格交点的实际坐标,通过最小二乘法获取非线性畸变系数。由于考虑了引起镜头畸变的多种因素,可提高实际标定的精度。对于视觉测量系统,在具体标定前先求出畸变系数,再对实测的像素进行校正,这样既可以提高标定精度,又不影响视觉测量的速度。 相似文献
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“科技进步一小步,人类进步一大步”,体温计也历经了漫长的完善与演进的过程体温计古已有之。自16世纪伽利略发明第一支体温计之后,人类经过了300年才设计出了使用方便、性能可靠的体温计——奥尔伯特在1867年设计了一个能快速而准确测量体温、长度只有约15厘米的体温计。艾尔伯特之前的体温计,无论是外形还是使用效果都不太让人满意。德国教授文德利希在1868年出版的《疾病与体温》一书中记载了2.5万例病人的体温变化,而他所使用的体温计的大小是奥尔伯特体温计的两倍,每次要花20分钟的时间来记录体温…… 相似文献
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Organization A was a large company with many production sites organized in regions. All production sites and regional offices were attached to the star and cluster network emanating from the computer centre based at head office. In addition to the midrange computers, each production site was controlled, to a greater or lesser extent, by process computers. The approach taken in this case study is of a whole business resumption plan to cover the business computers, the process computers and the loss of head office accommodation and facilities. The disaster recovery plan details, by application, the action to be taken at each of seven levels of disaster. Only a few different examples of these are included in this article. 相似文献
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Cloud manufacturing paradigm aims at gathering distributed manufacturing resources and enterprises to serve for more customized production. Production order which involving several tasks can be taken by distributed suppliers collaboratively at lower cost. The cloud manufacturing platform is responsible for not only arranging reasonable priorities, suitable suppliers, and production processes to multiple orders, but also scheduling hybrid tasks from different orders to manufacturing resources. To maximize the production efficiency and balance the trade-off among different production orders, this paper studies multi-phase integrated scheduling of hybrid tasks in cloud manufacturing environment, which containing order priority assignment, supplier and production process selection, and production line scheduling. Five key objectives are taken into account to analyze the interconnections among different resources and production processes. Six representative multi-objective evolutionary algorithms are adopted to solve the integrated scheduling problem. Experimental results on six production cases show that integrated scheduling is more effective than the traditional step-by-step decision, leading to less production cost and time. In addition, a comparison among the six algorithms is carried out to determine the one best suited for the integrated scheduling problem in different circumstances. 相似文献
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The growth of the Japanese steel industry has been supported by three factors: operation, equipment, and management technology. Computer-integrated manufacturing (CIM) is the core of management technology. CIM's purpose is to improve production efficiency through computer integration of data covering the staff (design and production control) and management department as well as the production line process department (order entry, manufacturing, and shipment). In this paper, an overview of the Japanese steel industry's system development process is given and the steps taken in order to establish the CIM system are described. The organization, operation, and improvement of operational capability, along with marketing and production-related systems, are integrated. Furthermore, an integrated system model is given as a CIM conceptual model. In closing, reference is also made to the challenges facing CIM in the Japanese steel industry as well as future directions to be taken. 相似文献
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提出了一种改进的综合生产计划动态规划优化方法。以1999年甘应爱主编的《运筹学》第227~230页给出的一类综合生产计划问题为研究对象,深入分析了原综合生产计划问题、数学优化模型、动态规划求解过程、计算方法存在的不足并提出了相应的改进措施。通过案例分析验证了所提方法的有效性。 相似文献
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一、引言 知识获取被认为是知识工程的瓶颈,正如NIIs-。n田所指出的:“·…系统所需的成百条规则和上千个事实往往都是靠访问有关应用领域的专家来获取的,要把专家们的知识表示成事实和规则(或者任何其它形式的表达式)往往是一个枯燥而费时的过程,使这种知识获取过程自动化将是人工智能技术的一大进步.回顾历史,第一代知识获取技术是七十年代所广泛采用的“会晤”方式,即由计算机专家与领域专家长期交流;第二代知识获取技术则以八十年代计算机的辅助应用为特色;进入九十年代后,人们提出了高度集成的知识获取环境,这种环境提供从编辑、有效… 相似文献
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为将基于探测目标的自适应航路规划算法进行产品化,采用基于模型的设计方法以及自动代码生成技术,使算法模型快速、健壮地转化为软件产品。软件产品由核心算法和外设驱动组成,核心算法采用基于模型设计思想进行设计,仿真验证后自动生成目标语言代码,考虑到IO访问方式的复杂性,外设驱动模块采用代码自动生成与手动编码相结合的方式实现,核心代码与外设驱动模块组成的完整工程下载到硬件板卡,通过试验验证软件产品与初始设计模型的一致性,实现算法的产品化。经过实践,所提出的算法产品化实现方法能够提高设算法设计效率和各阶段中间产品继承性,降低各阶段调试复杂性,实现产品开发的敏捷性和健壮性,可作为复杂算法工程实现的参考。 相似文献
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在化工装置控制中,CENTUM CS3000被广泛应用,其操作平台为Windows XP Professional,但在其实际使用中,经常有操作人员进入Windows系统,进行与生产无关的操作,本文提出的改进措施,有效地提高了操作站的安全性。 相似文献
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为了得到更合理、准确的未来能源发展趋势预测结果,利用非线性函数模型描述能源生产发展系统的非线性动态特征。分别采用非线性指数回归模型和灰色系统理论中的模型方法建立了中国油气资源生产发展预测模型。并利用组合预测理论及建模技术采用标准差法进行最优组合权重分配,建立了中国油气资源生产发展的组合预测模型。经检验达到了较好的预测精度。结果表明,这一模型适合于油气资源生产发展的趋势预测,为能源预测提供了新的方法,并在实例中进行了初步的预测应用,取得了较好的效果,为我国的能源发展战略提供可靠的科学依据。 相似文献
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B. C. Giri A. K. Jalan K. S. Chaudhuri 《International Transactions in Operational Research》2005,12(2):235-245
In this paper, an economic production quantity model is developed for a production–inventory system where the demand rate increases with time, the production rate is finite and adjustable in each cycle over an infinite planning horizon and shortages are permitted. The cost of adjusting the production rate depends linearly on the magnitude of the change in the production rate. During the stock‐out period, a known fraction of the unsatisfied demands is backordered while the remaining fraction is lost. The model is formulated taking the demand rate as a general increasing function of time and the optimal production policy is obtained for the special case of a linearly increasing demand rate. The proposed model is also shown to be suitable for a prescribed time horizon. A procedure to find approximately the minimum total cost of the system over a finite time horizon is suggested. A numerical example is taken to illustrate the solution procedure of the developed model. 相似文献