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介绍了一种基于视觉伺服的农业机器人并联采摘系统,该系统由视觉系统、上位机、下位机、并联机构等4部分组成.视觉系统采集目标图像并传递给上位机,上位机对图像进行处理,识别和定位目标,计算并联机构的运动控制量,通过串口通信发送给下位机,下位机接收到控制量后,根据运动控制量驱动继电器模块作相应的开关动作,完成并联采摘臂的控制.实验证明:该系统对于实现农业机器人采摘作业具有可行性. 相似文献
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一种步进电机驱动器及其控制系统的研究 总被引:2,自引:0,他引:2
本文研究开发了一种步进电机驱动器及其控制系统.该系统以PC机作为上位机,以单片机作为下位机.可使上位机能够可靠地将经过处理的控制指令和参数发送到下位机,保证下位机能够准确、及时地发出控制信号,通过驱动器驱动步进电机工作.同时,上位机检测下住机的各种状态信号,进行诊断和处理. 相似文献
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《电子制作.电脑维护与应用》2017,(8)
本文提出了一种基于无线传输的LED广告屏设计方案。硬件电路以MSP430F149单片机为主控单元,以SIM300C为无线传输模块,采用GPRS无线网络传输方式进行显示数据和控制指令的传输,系统可以完成显示驱动、无线传输、稳压控制等功能。软件系统采用模块化编程方案,其中上位机用于文字信息处理和系统控制,下位机实现系统各功能模块的控制。本系统的设计与实现具有一定的工程应用价值。 相似文献
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针对油田注水时对注水设备控制和数据采集的实时性要求,基于实验室油田注水仿真设备设计了一个油田注水硬件控制和远程监控平台。采用多线程技术和SuperSocket技术设计了上位机远程管理系统软件,用户指令通过TCP/IP协议传送到下位机。井口端设备以STM32单片机作为控制器,用GPRS模块接收上位机指令以及传输注水设备的实时数据。经测试,上位机软件能够准确实时向下位机发送控制指令,系统的反应时间约1s。该研究对其他油田注水智能化管控研究有参考意义。 相似文献
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吴允志 《电子制作.电脑维护与应用》2013,(6):203-204
本文介绍了一种基于单片机串行通信的LED点阵显示系统的设计与实现方法。该系统采用上—下位机的结构构建,PC为上位机,下位机则以单片机控制电路和点阵显示电路为核心。PC通过串行通信向单片机发送控制命令和显示内容的字模,实现对显示内容和显示方式的控制。点阵显示驱动电路采用移位寄存器74HC595,并通过级联方式扩大显示屏的规模以达到扩充显示容量的目的,从而可实现多条信息的实时发布和修改。该系统只占用单片机少量的I/O口,为系统功能的进一步扩展预留了空间。 相似文献
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针对飞机除冰液加热,设计了一种基于GPRS(通用分组无线服务)网络的远程监控系统.它可以实现对设备的实时监控,及时有效地完成飞机地面除冰.该系统由上位机和下位机两部分组成:PLC作为下位机的控制系统,对执行机构进行控制输出,并且由A/D转换模块采集加热设备管道内的物理参数;远程控制中心作为上位机的监控系统,包括两种方式:一是利用数据服务中心作为远程控制中心,二是利用组态软件设计系统的操作界面作为远程控制中心.GPRS DTU(data transfer unit)通信模块通过GPRS网络完成与远程控制中心的无线通信,实现上位机与下位机之间的数据交互. 相似文献
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Gregory K 《Applied ergonomics》1982,13(1):11-13
For each of us the world is a complex of dichotomous constructs clustering to form objects. Of importance to the marketing psychologist is the structure of 'consumer objects', and his aim is to determine the nature of these. The meaning of stimuli may be categorised into the denotive or functional physical aspects of being, and the connotive or emotive affectional aspects. Both are of importance in meeting consumer need. Denotive meaning is more obvious than connotive, and more covert means are necessary to uncover the latter. Examples are given of the results of such analyses of connotive being and a technique which enables a numerate assessment of the consumer object is described with an illustrative example. 相似文献
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针对不同情绪刺激下加法计算的认知加工过程差异问题,提出了不同情绪刺激下加法计算的认知假设模型,验证了不同情绪刺激对加法计算的影响机制。以正性、中性、负性情绪图片刺激下没有进位的二位数加法计算为实验范式,依据被试事前事后问卷调查及行为实验结果,采用行为实验与ACT-R认知仿真实验相结合的方法进行研究。通过行为实验测试了24名被试在不同情绪刺激下加法计算的行为实验结果;认知仿真实验以不同情绪刺激下加法计算的行为结果及相关研究结果为假设,提出了不同情绪下加法计算认知过程的假设模型。结果显示正性情绪刺激下加法计算的模拟反应时间2040ms与真实反应时间2077ms 107,偏差37ms;中性情绪刺激下加法计算的模拟反应时间2106ms与真实反应时间2090ms 98,偏差16ms;负性情绪刺激下加法计算的模拟反应时间2264ms与真实反应时间2218ms 52,偏差46ms。结果表明,正性情绪刺激对认知计算具有促进作用,负性情绪刺激对加法计算具有抑制作用。认知模型的模拟反应时间与真实反应时间非常接近,假设模型的合理性在反应时数据上得到有效验证;同时模型输出的认知信息加工过程序列模块的协同工作机制与分析过程一致,从而使得模型在逻辑合理性得到了有效解释。 相似文献
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采用通用验证方法学(UVM)搭建验证平台,以AHB总线上挂载的存储控制器为验证对象,重点分析了UVM验证平台的设计;采用传统的定向验证方法将很难遍历到所有情况,而通过UVM验证平台能够产生受约束的随机激励信号,对存储控制器进行全面的验证,并能自动收集功能覆盖率和分析验证结果;验证结果表明,该验证平台能有效地查出设计缺陷,达到覆盖率要求,减少验证时间,提高验证效率,且具有良好的可配置性和可复用性. 相似文献
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论述了如何使用建库工具-MERCURY建立1.2μmCMOS标准单元库的方法。并介绍了MERCURY的几个主要区域与功能。 相似文献
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Mohammed Alghamdi Simon Hoermann Nicola Swain 《Behaviour & Information Technology》2017,36(9):913-934
The experience of Virtual Reality (VR) can lead to unwanted or wanted psychological stress reactions. Highly immersive VR games for instance utilise extreme, life-threatening, or dangerous situations to achieve those responses from their players. There is also sufficient evidence that in clinical settings and specific situations, such as fear of heights or post-traumatic stress, virtual stimuli can lead to perceived stress for clients. However, there is a gap in research targeting everyday, mild emotional stimuli, which are neither extreme nor specific and which are not presented in an immersive system. To what extent can common stimuli in a non-immersive virtual environment elicit actual stress reactions for its users? We developed a desktop VR system and evaluated it in a study with 54 participants. We could show that virtual stimuli in a common, domestic family environment led to a significant increase in perceived stress as measured by quantitative (self-reports) and qualitative (semi-structured interviews analysed with a General Inductive Approach (GIA)) responses. The results also showed that the introduction of virtual stimuli induced significantly higher levels of perceived workload and sense of presence and led to different physiological reactions. These findings have implications for the design and implementation of non-immersive VR systems. 相似文献
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郭崎 《计算机辅助设计与图形学学报》2012,24(5):690-698
如何生成高质量的验证激励是功能验证中的核心问题之一.随着功能验证的不断进行,验证激励的有效性也随之降低.为了提高验证激励的质量,提出一种在线筛选技术来处理验证激励.该技术采用单分类支持向量机来在线地构建分类器,以对新生成的验证激励是否冗余进行预测,如果是冗余的,则不进入仿真阶段进行仿真.在此基础上,进一步提出指令序列核函数来衡量不同指令序列的相似程度.实验结果表明,与约束随机生成技术相比,文中技术可以减少约83%的验证激励及79%的验证时间. 相似文献
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Mao-Jiun J. Wang Chih-Ming Liu Yuh-Chuan Shih 《International Journal of Industrial Ergonomics》1991,8(4):335-343
The difference threshold is an important index in psychophysics. A simple and effective method combining the pairwise comparison procedure of AHP (Analytic Hierarchy Process) and the method of constant stimuli is proposed to determine the difference threshold in judging weight difference. The difference thresholds obtained by the proposed approach were 3.87% and 3.96% with the standard's weights at 8.2 kg and 20 kg respectively. The results are very close to the findings of carlson, Drury and Webber (1977), as well as Hsia and Drury (1986), which also support the validity of the method. Further, it is interesting to find that wearing gloves has no effect on the difference threshold in judging weight difference. It indicates that human's capability of judging weight difference is not affected when wearing gloves to perform material handling tasks. 相似文献
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Masahiro Shimizu Kosuke Minzan Hiroki Kawashima Kota Miyasaka Takuya Umedachi Toshihiko Ogura 《Advanced Robotics》2019,33(5):232-242
Living organisms are capable of self-reproduction, self-repair, and high adaptability through self-organization. By applying biological materials such as cells and tissues to a robot, the resulting bio-machine hybrid system can perform important biological functions beyond those of traditional robots. In this study, we focused on the mechanobiological properties of a C2C12 cell, which is an immortalized mouse myoblast cell line. Calcium ion levels increased when the cells were subjected to mechanical stimuli. This type of physiological phenomenon can be applied in novel tactile sensors to develop a bio-machine hybrid system. We verified the tactile sensation characteristics of the cells. We cultured the cells on a thin polydimethylsulfoxane (PDMS) membrane. We applied two types of mechanical stimuli to opposite sides of the PDMS membrane. Next, we observed the cell distributions and quantified the increase in calcium ion levels inside the cells for tactile sensation. Our results demonstrate that the mechanical stimuli caused significant changes in the orientation and local density of cell aggregation. Interestingly, we confirmed that calcium ion increases depend on the history of mechanical stimuli application. 相似文献