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1.
针对载机机动运动导致雷达伺服机构中存在复杂的耦合扰动力矩,无法实现伺服控制中扰动力矩精确补偿的问题,展开雷达伺服系统耦合力矩的建模和影响分析。采用矢量叠加原理推导两维机构的运动学方程和惯量耦合方程,建立方位和俯仰两轴的动力学耦合力矩模型,并通过仿真分析载机机动和不机动情况下,载机平台对两维框架的动力学耦合力矩和位置跟踪误差的影响。仿真结果表明,载机不机动时两维框架间的耦合力矩较小,跟踪误差较小;当载机机动时两维框架间耦合力矩增大,且耦合力矩表现为时变的正弦特性,此时跟踪误差增大且表现为时变和不规则的特点。动力学耦合力矩模型的建立为机载雷达伺服控制系统的设计提供了理论依据。  相似文献   
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Crowd counting with density estimation has been an active research community due to its significant applications in the fields of public security, video surveillance, traffic monitoring. However, Crowd counting for congested scenes often suffers from some obstacles including severe occlusions, large scale variations, noise interference, etc. In this paper, using the first ten layers of a modified VGG16 and dilated convolution layers as the framework, we have proposed a CNN based crowd counting and density estimation model improved by the attention aware modules with residual connections. To tackle the problem of noise interference, convolutional block attention modules have been introduced into the deep network to segment the foreground and background to focus on interest information, refining deeper features of the input image. To improve information transmission and reuse, residual connections are utilized to link 3 attention blocks. Meanwhile, dilated convolution layers keep larger reception fields and obtain high-resolution density maps. The proposed method has been evaluated on three public benchmarks, i.e. Shanghai Tech A & B, UCF-QNRF and MALL, achieving the mean absolute errors of 64.6 & 8.3, 113.8 and 1.68, respectively. The results outperform some existing excellent approaches. This indicates that the proposed model has high accuracy and better robustness, which is suitable for crowd counting and density estimation in various congested scenes.  相似文献   
3.
赵裕沛  费飞  杨德华  陈超 《仪器仪表学报》2017,38(10):2415-2421
疾病或意外发生后经常会引起患者的手部功能障碍,但目前手部康复评估仍然依赖医生经验等主观判断,市场上现有的部分康复产品结构复杂、价格昂贵,而且无法长期记录病人的康复数据,不便于医生进行诊断和复查。提出了一种面向手部康复的多传感器数据融合手套,采用最小二乘法对加速度和地磁进行校正,利用互补滤波进行传感器数据融合,依据真实手骨模型进行虚拟手部建模,用数据手套获得的手部姿态驱动Unity3D中的手部模型。该系统可以准确地记录手的姿态信息,并在虚拟环境中进行实时还原,能高效地帮助医生进行康复评估和协助患者进行康复训练。  相似文献   
4.
This paper explores dwell time constraints on switched systems with multiple, possibly disparate invariant limit sets. We show that, under suitable conditions, trajectories globally converge to a superset of the limit sets and then remain in a second, larger superset. We show the effectiveness of the dwell-time conditions by using examples of switching limit cycles commonly found in robotic locomotion and flapping flight.  相似文献   
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With the development of display technology, the healthy problems caused by watching 2D/3DTV have received more and more attention. This paper utilized resting-state functional magnetic resonance imaging to study the changes of small-world brain network before and after one-hour 2D/3DTV watching, and explored the brain fatigue mechanism caused by watching 2D/3DTV. We conclude that one-hour watching of 2DTV will not increase the burden of brain. On the contrary, one-hour watching of 3DTV requires the brain to regulate the efficiency of brain areas, such as temporal lobe and occipital lobe, which may explain the fact that watching 3DTV can easier cause brain fatigue than watching 2DTV.  相似文献   
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This paper proposes a blind image deconvolution method which consists of two sequential phases, i.e., blur kernel estimation and image restoration. In the first phase, we adopt the L0-norm of image gradients and total variation (TV) to regularize the latent image and blur kernel, respectively. Then we design an alternating optimization algorithm which jointly incorporates the estimation of intermediately restored image, blur kernel and regularization parameters into account. In the second phase, we propose to take the mixture of L0-norm of image gradients and TV to regularize the latent image, and design an efficient non-blind deconvolution algorithm to achieve the restored image. Experimental results on both a benchmark image dataset and real-world blurred images show that the proposed method can effectively restore image details while suppress noise and ringing artifacts, the result is of high quality which is competitive with some state of the art methods.  相似文献   
9.
在脉冲幅度、脉冲位置编码的基础上,设计了相位步进脉冲位置编码方案,通过数字正交解调方法提取时隙和相位信息,其编码容量接近300万,可满足大多数应用场合的需求。通过理论推导和仿真分析对比研究了单通道与双通道声表面波标签的回波幅值与反射栅反射率之间的关系,结果表明,对于反射栅数量相同的两种标签,双通道标签可以选取更高的反射栅反射率,从而具有更远的识别距离。实际制作了相应的声表面波标签并进行了测试,测试结果验证了采用相位步进脉冲位置编码双通道标签的大容量和远距离特点。  相似文献   
10.
陈雨荻  熊智  刘建业  杨闯  晁丽君  彭杨 《兵工学报》2022,43(11):2965-2980
无人移动平台具有广泛的应用前景,其搭载的自主导航系统在执行任务中发挥了重要作用。随着脑科学研究的逐渐深入,类脑自主导航技术为解决未知复杂环境下难以构建精确导航数学模型问题提供了新的方法和实现途径。本文首先介绍基于内嗅皮层-海马区空间表征机理的类脑自主导航技术理论;其次讨论在大脑导航理论基础上构建类脑自主导航系统和空间表征细胞模型的方法和国内外研究现状;然后归纳未知复杂环境下类脑同步地图构建与定位、类脑路径规划等技术的研究应用,最后对类脑自主导航技术的未来发展提出了一些建议。  相似文献   
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