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目的 探究利用眼动和生理指标评价放射治疗软件操作系统用户界面可用性设计水平。方法 首先,通过专家咨询法在放射治疗软件操作系统用户界面选定了5个重要的用户界面设计要素,利用专家咨询为5个重要用户界面设计要素设计了2种不同风格的设计水平。其次,利用SPSS统计分析软件,通过正交设计实验法构建了8个放射治疗软件操作系统用户界面模型,用于实验测试。制定了具体的实验测试任务,并纳入了8个眼动指标和4个生理指标作为放射治疗软件操作系统用户界面可用性评估指标。招募了20名放射治疗技师作为实验测试者参与放射治疗软件操作系统用户界面可用性测试,并采集了眼动指标和生理指标数据用于放射治疗软件操作系统用户界面可用性评价。结果 皮肤导电性在8个不同页面中表现出了显著性统计学差异,适用于放射治疗软件操作系统用户界面可用性评价及建模;利用最小偏二乘回归法建立了放射治疗软件操作系统用户界面设计要素与皮肤导电性的可用性评估预测模型,并验证了模型的有效性。结论 该模型可有效用于放射治疗软件操作系统用户界面可用性评价、预测及优化设计改进。 相似文献
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目的 研究色标传感器的动态响应特性。方法 采用相位法测试色标传感器的动态响应特性;以嵌入式工业触摸屏为控制核心, 与色标传感器、 富士伺服电机、 伺服驱动器和编码器组成测试装置, 间接测试动态响应时间; 用MATLAB软件处理实验数据, 分析其动态特性。结果 在动态响应时间内, 根据基于触摸屏的相位法, 测得动态响应时间为2 ms, 其系统为一阶系统。结论 该测试方法简单可靠, 可以测出各种传感器的动态响应时间, 并可以判断其系统特性。 相似文献
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针对电化学气体传感器的动态响应延迟问题,设计了一种电化学气体传感器的动态特性测量装置,研究了气体传感器动态特性补偿及应用。为减小电化学气体传感器的动态响应时间,提出了用粒子群优化(PSO)算法对电化学气体传感器逆建模的动态补偿法,获得动态补偿滤波器模型,对电化学气体传感器的响应-恢复时间进行补偿。将补偿方法应用于研制的存储式气体浓度测试系统,测试结果表明该方法有效地改善了传感器的动态响应特性,并在响应时间上提高了3.6倍,恢复时间提高了2.8倍,具有可移植性强、易于实现的特点。 相似文献
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针对冲击缓冲用磁流变阻尼器对快速性的要求,对其响应特性进行理论建模与实验研究。根据磁流变线圈电磁电路,建立了磁感应强度响应特性理论模型,并用频率测定方法确定了响应时间常数。通过实验测试了不同电流条件下磁流变阻尼器的磁感应强度阶跃响应,结果表明不同幅值的激励电流对磁感应强度的响应并无明显影响,获得上升阶跃平均响应时间常数为4.9 ms,下降阶跃平均响应时间常数为2.8 ms。建立了剪切屈服应力的二阶响应模型,并利用冲击实验台测试了冲击载荷下磁流变阻尼器剪切屈服应力的阶跃响应,通过模型拟合获得响应时间常数为4.8 ms。实验结果表明剪切屈服应力二阶模型能较好地吻合实验响应曲线,说明该模型能够较准确地描述冲击条件下磁流变阻尼器的响应特性。 相似文献
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目的针对智能产品的语音用户界面,探讨语音唤醒和语音对话等关键环节适宜的响应时间。方法通过9(唤醒响应时间)×3(唤醒响应方式)双因素实验探索唤醒响应时间的影响;通过单因素实验探究对话响应时间的影响;每个实验都需要被试对响应时间的舒适度进行评价。结果语音唤醒环节的响应方式和响应时间存在交互作用,3种唤醒响应方式下被试感觉舒适的响应时间分别是200 ms~400 ms、200 ms~500 ms、300 ms~600 ms,语音对话环节被试感觉舒适的响应时间为650 ms~1050 ms。结论语音交互的不同环节,被试对语音用户界面舒适的响应时间存在不同的要求。 相似文献
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用VxD编写Windows95中断处理程序的方法 总被引:4,自引:0,他引:4
Windows95操作系统下的实时控制程序,分得用其孤图形界面等许多特性,但由于系统统一管理资源,利用Windows系统作实时控制的很少见。探讨利用虚拟设备驱动程序(VxD)技术提高Windows中断响应速度的方法,并提供有关测试数据,用此方法可在一定程度上实现了Windows95下的实时控制。 相似文献
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以差分吸收激光雷达为背景,对基于WDM的实时监测控制系统的设计中涉及的关键技术进行研究。结合具体的实际系统,采用模块化设计的方法,利用中断调用及线程调度、对象同步技术加以实现,使得整个系统在系统维护、实时处理能力上有了很大的提高。 相似文献
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针对目前数控机床运行数据种类多、数量大且难以实现实时处理的问题,提出一种基于Storm流处理技术的数控机床运行数据监测方法。该方法采用实时大数据计算框架Storm作为核心,通过外置传感器和数控系统通信协议获取数控机床运行数据。使用Kafka作为消息队列将机床运行数据上传给Storm,然后在Storm框架中进行数据统计、数据异常检测等实时分析业务,之后将分析结果存储于数据库中,并实现分析结果的可视化展示。在实际生产环境中对基于Storm流处理的监测方法进行测试,实验结果表明:该方法能够实现对数控机床运行数据的实时监测与处理,具有强实时计算能力、高扩展性的优点;并且在处理相对复杂的数控机床运行数据监测业务时,该方法的优势更显著。研究结果为数控机床运行数据监测提供了新思路,该监测方法具有广阔的工程应用前景。 相似文献
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实时子结构试验方法因其高效、适用面广,近20年来受到结构试验领域的重视。虽然近年来硬件技术有所提升,但仍受到一些限制,例如,作动器加载时运动机构和控制回路存在时滞,导致无法准确地施加位移。故实时子结构试验中,如何消除时滞影响成为试验成功与否的关键所在。为了减小和消除实时子结构试验中时滞的不利效应,该文首先根据液压伺服作动系统和Simulink建立了实时子结构试验平台,而后提出了基于时滞追踪的自适应补偿方法,最后采用数值仿真和子结构加载试验进行了验证和参数分析。结果表明:该算法可根据作动系统负载不同对时滞实时自适应地补偿,从而避免迭代试验。该方法不改变原控制器固有算法,也无需对系统时滞参量进行预判定或系统辨识,只需将提出的自适应补偿算法串联接入到系统之中即可,实用性、鲁棒性好。算法对非线性系统导致的时变时滞效应也有理想的补偿效果,通过一个铝合金梁的弯曲测试说明了该算法的正确性,可推广应用于结构实时仿真试验。 相似文献
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A scheduling/rescheduling procedure is proposed for real-time control of a computerized manufacturing facility managed by a central manufacturing operating system. The procedure implies schedule revisions upon significant operational changes such as machine breakdowns. Experiments to evaluate the total production time of a computerized manufacturing system with breakdowns under scheduling/rescheduling have yielded advantages of between 25% to 7-0% compared to fixed sequencing and priority despatching procedures, respectively. Computation times required for the scheduling procedures on a CDC 65OO/66OO have also been studied. The scheduling/rescheduling procedure for an actual facility required less than two minutes, and the computation time can be regulated by the selection of parameters in an approximate method of scheduling. 相似文献
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A new open architecture controller, Platform for Open Architecture Controller (POAC), is discussed. Using a general operating system with a hard real-time extension, POAC divides the application software of the controller into the developing and application systems. The developing system includes the function subsystem and communication subsystem, which respectively realize the function module capable of running on the different operating systems and the communication interface uniform to all kinds of operating systems. The application system defines the model of the task module, realizing the interoperability and interchangeability between the task modules. POAC establishes a modular developing method and implements the real-time and non-real-time functions separately. The comparison with Next Generation Controller (NGC), the Open System Architecture for Controls within Automation Systems (OSACA), the Open, Modular Architecture Controls (OMAC) and the Open System Environment for Controller (OSEC) shows that POAC is a good, open architecture controller with the advantages of real-time performance, simplicity and practicability. In summary, POAC develops a simple and practical architecture and a standard of open architecture controller that largely decreases the developing time from the standard to the product. 相似文献
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In the field of face recognition and in the establishment of a face database, face detection is a crucial step. In current security and surveillance systems, most of the face detection proposed now is focused on software algorithms to improve the detection rate and decrease false alarms. However, these more complex algorithms require more computation time, which hinders real-time applications. In this paper, we propose a real-time multi-face detection system based on hardware design to enhance processing time. The proposed hardware architecture is implemented on an Altera DE2-70 field-programmable gate array development board to test the feasibility of our hardware design. To implement, our system requires 15,223 logic elements. The proposed system can operate in real-time at a frame rate of 30?fps, and detects up to five faces simultaneously. Our experimental results show that the proposed face detection architecture provides a reliable real-time system operating at low cost and providing a high detection rate. 相似文献
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Kanai H Koiwa Y Zhang J 《IEEE transactions on ultrasonics, ferroelectrics, and frequency control》1999,46(5):1229-1241
We have already developed a new method, namely, the phased tracking method, to track the movement of the heart wall and arterial wall accurately based on both the phase and magnitude of the demodulated signals to determine the instantaneous position of an object. This method has been realized by an off-line measurement system, which cannot be applied to transient evaluation of rapid response of the cardiovascular system to physiological stress. In this paper, therefore, a real-time system to measure change in the thickness of the myocardium and the arterial wall is presented. In this system, an analytic signal from standard ultrasonic diagnostic equipment is analogue-to-digital (A/D) converted at a sampling frequency of 1 MHz. By pipelining and parallel processing using four high-speed digital signal processing (DSP) chips, the method described is realized in real time. The tracking results for both sides of the heart and/or arterial wall are superimposed on the M (motion)-mode image in the work station (WS), and the thickness changes of the heart and/or arterial wall are also displayed and digital-to-analogue (D/A) converted in real time. From the regional change in thickness of the heart wall, spatial distribution of myocardial motility and contractility can be evaluated. For the arterial wall, its local elasticity can be evaluated by referring to the blood pressure. In in vivo experiments, the rapid response of the change in wall thickness of the carotid artery to the dose of the nitroglycerine (NTG) is evaluated. This new real-time system offers potential for quantitative diagnosis of myocardial motility, early stage atherosclerosis, and the transient evaluation of the rapid response of the cardiovascular system to physiological stress. 相似文献