共查询到20条相似文献,搜索用时 125 毫秒
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PET影像检查中常常利用示踪剂进行造影.目前示踪剂的分装方法主要是传统人工稀释分装,存在着分装效率不高,对人体辐射剂量大等问题.为了解决上述问题,研究者对自动分装系统进行了一定的研究,但是其控制界面功能单一,不能实时监控分装工作情况.因此本文设计了一款基于Qt的自动化分装热室控制界面.该界面能接收通过网络传输的远端摄像头数据,对分装热室内部情况进行实时的显示,应用亮度均衡算法对图像进行处理.并使用串口通讯协议通过蓝牙与STM32F429开发板进行连接,设计相应的功能控件对开发板进行远程操作,配合分装机械系统实现对分装热室自动化控制.经试验测试表明,本界面实现了人机交互的友好界面功能,很好的提高了监控画质和系统响应速度,相比常用的监控软件MiniVCap和VCam,视频延时和CPU占有率都有明显的降低,并能稳定地与STM32F429进行连接,在性能和指标上达到了设计需要. 相似文献
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安全仪表系统是确保空分装置安全运行的重要保证,针对空分装置安全仪表系统的设计问题,介绍了需从检测单元、逻辑控制单元、最终执行单元三部分整体设计。对于最重要的逻辑控制单元的设计,介绍了采用安全可编程控制器的实现方案,总结了当前安全可编程控制器的主要结构和特点。针对空分装置安全仪表系统回路数较少,采用整套安全可编程控制器成本负担较重的特点,提出了基于安全报警器和安全继电器的设计方案,并结合实际3取2投票结构计算公式,计算了采用该方案实现的逻辑控制器失效率,结果验证了该方案的安全性和经济性。最后分析对比了两种方案的特点和使用场合,为空分装置安全仪表系统设计者提供了重要参考。 相似文献
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介绍了为国有设备技术改造而研制的数控螺旋分装机系统,8098单片机与步进电机在该系统中的应用,详细叙述了系统工作原理及步进电机性能,控制系统硬件结构、软件设计,系统可靠性设计. 相似文献
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汽车总装线由车身储存工段、底盘装配工段、车门分装输送工段、最终装配工段、动力总成分装、发动机总装工段等十几个步骤构成。为了能使每个工段都能正确高效的执行,就必须要在生产过程中注重每一个环节的完美。而要确保每个环节都既达到高精细度,又满足工业生产必需的高效率,就必然要借助最先进的生产制造技术才能实现。 相似文献
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陈允霞 《数码设计:surface》2009,(5):53-57
组合模块形式的沙发早已屡见不鲜,然而设计师们依旧热衷于此.不断推陈出新。对于开放式的公共空间来说,可以灵活组合放置又易于分装移动的组合模块沙发十分适合其流动性大的空间特点。 相似文献
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介绍了一种单片机实现的用于装量生产线上的蠕动泵装置.它可实现装量生产线的手动或自动的单次、多次及混合分装,其分装的精度可达到1‰ml. 相似文献
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Houman Alborzi 《Information Processing Letters》2007,101(1):6-12
A detailed CPU execution-time analysis and implementation are given for a bulk loading algorithm to construct R-trees due to García et al. [Y.J. García, M.A. López, S.T. Leutenegger, A greedy algorithm for bulk loading R-trees, in: GIS'98: Proc. of the 6th ACM Intl. Symp. on Advances in Geographic Information Systems, Washington, DC, 1998, pp. 163-164] which is known as the top-down greedy split (TGS) bulk loading algorithm. The TGS algorithm makes use of a classical bottom-up packing approach. In addition, an alternative packing approach termed top-down packing is introduced which may lead to improved query performance, and it is shown how to incorporate it into the TGS algorithm. A discussion is also presented of the tradeoffs of using the bottom-up and top-down packing approaches. 相似文献
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面向对象智能测控系统设计 总被引:2,自引:0,他引:2
本介绍了一种基于面向对象方法的过程测控系统的软硬件设计思想。通过将过程对象分解为单元对象(由智能对象管理卡管理)和设备对象(由主机管理),较好地体现了过程控制的本质,并在系统可重用性、开放性、扩展性等方面具有明显的优越性。 相似文献
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In packing problems with fragmentation a set of items of known weight is given, together with a set of bins of limited capacity; the task is to find an assignment of items to bins such that the sum of items assigned to the same bin does not exceed its capacity. As a distinctive feature, items can be split at a price, and fractionally assigned to different bins. Arising in diverse application fields, packing with fragmentation has been investigated in the literature from both theoretical, modeling, approximation and exact optimization points of view.We improve the theoretical understanding of the problem and we introduce new models by exploiting only its combinatorial nature. We design new exact solution algorithms and heuristics based on these models. We consider also variants from the literature with different objective functions and the option of handling weight overhead after splitting. We present experimental results on both datasets from the literature and new, more challenging, ones. These show that our algorithms are both flexible and effective, outperforming by orders of magnitude previous approaches from the literature for all the variants considered. By using our algorithms we could also assess the impact of explicitly handling split overhead, in terms of both solutions quality and computing effort. 相似文献
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Following recent interest in the study of computer science problems in a game theoretic setting, we consider the well known
bin packing problem where the items are controlled by selfish agents. Each agent is charged with a cost according to the fraction
of the used bin space its item requires. That is, the cost of the bin is split among the agents, proportionally to their sizes.
Thus, the selfish agents prefer their items to be packed in a bin that is as full as possible. The social goal is to minimize
the number of the bins used. The social cost in this case is therefore the number of bins used in the packing. 相似文献
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嵌入式实时多任务程序设计 总被引:10,自引:0,他引:10
主要介绍如何基于实时多任务操作系统内核开发嵌入式应用系统。详细阐述了如何将一项工作划分为多个任务,怎样给任务分配优先级,如何使用内核提供的系统功能,如信号量、消息邮箱、消息队列、时间延迟等。 相似文献
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