提供可靠的连接到蜂窝连接的无人机可以非常具有挑战性;它们的性能高度取决于周围环境的性质，例如地面BSS的密度和高度。另一方面，高层建筑可能阻断来自地面BS的不期望的干扰信号，从而提高了UVS与其服务BS之间的连接。为了解决此类环境中的无人机的连接，本文提出了一种RL算法，以动态优化UAV的高度，因为它在通过环境中移动，目标是提高其经历的吞吐量。所提出的解决方案是使用来自爱尔兰都柏林市中心的两个不同地点的实验获得的测量来评估。在第一场景中，UAV连接到宏小区，而在第二场景中，UAV将在双层移动网络中关联到不同的小单元。结果表明，与基线方法相比，该溶液的吞吐量增加了6％至41％。
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Can we leverage the audiovisual information already present in video to improve self-supervised representation learning? To answer this question, we study various pretraining architectures and objectives within the masked autoencoding framework, motivated by the success of similar methods in natural language and image understanding. We show that we can achieve significant improvements on audiovisual downstream classification tasks, surpassing the state-of-the-art on VGGSound and AudioSet. Furthermore, we can leverage our audiovisual pretraining scheme for multiple unimodal downstream tasks using a single audiovisual pretrained model. We additionally demonstrate the transferability of our representations, achieving state-of-the-art audiovisual results on Epic Kitchens without pretraining specifically for this dataset.
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Recently, AutoFlow has shown promising results on learning a training set for optical flow, but requires ground truth labels in the target domain to compute its search metric. Observing a strong correlation between the ground truth search metric and self-supervised losses, we introduce self-supervised AutoFlow to handle real-world videos without ground truth labels. Using self-supervised loss as the search metric, our self-supervised AutoFlow performs on par with AutoFlow on Sintel and KITTI where ground truth is available, and performs better on the real-world DAVIS dataset. We further explore using self-supervised AutoFlow in the (semi-)supervised setting and obtain competitive results against the state of the art.
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Obstacles on the sidewalk often block the path, limiting passage and resulting in frustration and wasted time, especially for citizens and visitors who use assistive devices (wheelchairs, walkers, strollers, canes, etc). To enable equal participation and use of the city, all citizens should be able to perform and complete their daily activities in a similar amount of time and effort. Therefore, we aim to offer accessibility information regarding sidewalks, so that citizens can better plan their routes, and to help city officials identify the location of bottlenecks and act on them. In this paper we propose a novel pipeline to estimate obstacle-free sidewalk widths based on 3D point cloud data of the city of Amsterdam, as the first step to offer a more complete set of information regarding sidewalk accessibility.
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Event-based neuromorphic systems provide a low-power solution by using artificial neurons and synapses to process data asynchronously in the form of spikes. Ferroelectric Tunnel Junctions (FTJs) are ultra low-power memory devices and are well-suited to be integrated in these systems. Here, we present a hybrid FTJ-CMOS Integrate-and-Fire neuron which constitutes a fundamental building block for new-generation neuromorphic networks for edge computing. We demonstrate electrically tunable neural dynamics achievable by tuning the switching of the FTJ device.
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Inverse problems are paramount in Science and Engineering. In this paper, we consider the setup of Statistical Inverse Problem (SIP) and demonstrate how Stochastic Gradient Descent (SGD) algorithms can be used in the linear SIP setting. We provide consistency and finite sample bounds for the excess risk. We also propose a modification for the SGD algorithm where we leverage machine learning methods to smooth the stochastic gradients and improve empirical performance. We exemplify the algorithm in a setting of great interest nowadays: the Functional Linear Regression model. In this case we consider a synthetic data example and examples with a real data classification problem.
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这项研究提供了一个新颖的框架，以根据开源数据估算全球城市的公共交通巴士的经济，环境和社会价值。电动巴士是替代柴油巴士以获得环境和社会利益的引人注目的候选人。但是，评估总线电气化价值的最先进模型的适用性受到限制，因为它们需要可能难以购买的总线运营数据的细粒和定制数据。我们的估值工具使用通用过境饲料规范，这是全球运输机构使用的标准数据格式，为制定优先级排序策略提供了高级指导，以使总线机队电气化。我们开发了物理知识的机器学习模型，以评估每种运输途径的能耗，碳排放，健康影响以及总拥有成本。我们通过对大波士顿和米兰大都会地区的公交线路进行案例研究来证明我们的工具的可扩展性。
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本文介绍了对聪明差异的检查，并以三个机会的层次进行了检查。当结果在波动的载荷下方时，将差异速度和力解释为三个结果的主要差异，但是当暴露于接近载荷时，将其等效的运动和力与其结果相等。确定的运动学和元素在三种不同的负担案件下进行了假设研究。此外，三个负担案件的移动也被重新创建并集中在其当前和潜在应用以及其当前和潜在应用的好处。
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设计一个管道内的攀岩机器人，该机器人操纵锋利的齿轮以研究复杂的线关系。探索管道曲线时，传统的滚动/发生管道攀爬机器人往往会滑动。提议的变速箱连接到标准双输出变速箱的最远地面平面。仪器有助于实现一个非常明确的减速序列，在该序列中，机器人在向前移动时滑动和拉动。该仪器考虑了线路关系中每个轨道上施加的力，并有意修改机器人的轨道速度，从而解锁了微调的钥匙。这使得3个输出传输需要大量时间。机器人在具有各种轴承和防滑管道弯曲的管网上的挠度证明了所提出的结构的完整性。
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在机器学习研究社区中，关于模型复杂性与所需数据和计算能力的关系之间的关系存在共识。在现实世界应用中，这些计算要求并非总是可用的，激发了对正则化方法的研究。此外，当前和过去的研究表明，更简单的分类算法可以在计算机视觉任务上达到最先进的性能，并给定一种强大的方法来人为地增强培训数据集。因此，近年来，数据增强技术成为流行的研究主题。但是，现有的数据增强方法通常不如其他正则化方法传递。在本文中，我们确定了数据增强算法应用的主要领域，所使用的算法，重要的研究趋势，随着时间的推移的发展以及数据增强文献中的研究差距。为此，相关文献是通过Scopus数据库收集的。它的分析是在网络科学，文本挖掘和探索性分析方法之后进行的。我们希望读者能够了解数据扩展的潜力，并在数据增强研究中确定未来的研究方向和开放问题。
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