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CurveLight: An Accurate and Practical Indoor Positioning System CurveLight:一种精确实用的室内定位系统
Pub Date : 2021-11-15 DOI: 10.1145/3485730.3485934
S. Yan, Zhimeng Yin, Guang Tan
This paper presents CurveLight, an accurate and practical light positioning system. In CurveLight, the signal transmitter includes an infrared LED, covered by a hemispherical and rotatable shade, and the receiver detects the light signals with a photosensitive diode. When the shade is rotating, the transmitter generates a unique sequence of light signals for each point in the covered space. The main novelty of the system design is a set of curves that define different regions, either transparent or translucent, on the shade. The regions allow the light signals to create patterns from which the receiver can calculate its angles with respect to the transmitter. We design the curves in such a way that the angular information is most robust to errors caused by signal noise and motor jitters. Moreover, the shade is divided into multiple sectors, each providing independent positioning function, so as to maximize the position update rate. Experiments in various environments show that the system achieves 2-3 cm accuracy on average, with a 36 Hz update rate with a single transmitter. We present a product quality implementation of the system, and report the deployment experience in real-world environments, including autonomous driving and robotics navigation. CurveLight consistently offers centimeter-level accuracy and low latency, serving as a key component of the hybrid navigation solution for real systems in challenging scenarios.
CurveLight是一种精确实用的光定位系统。在CurveLight中,信号发射器包括一个由半球形和可旋转遮光罩覆盖的红外LED,接收器用光敏二极管检测光信号。当遮阳板旋转时,发射器为覆盖空间中的每个点产生独特的光信号序列。系统设计的主要新颖之处在于一组曲线,这些曲线在阴影上定义了不同的区域,无论是透明的还是半透明的。这些区域允许光信号形成模式,接收器可以从中计算出它相对于发射器的角度。我们以这样一种方式设计曲线,使角度信息对信号噪声和电机抖动引起的误差具有最大的鲁棒性。而且,遮阳板分为多个扇区,每个扇区都提供独立的定位功能,从而最大限度地提高位置更新率。在不同环境下的实验表明,该系统平均精度达到2-3 cm,单发射机更新速率为36 Hz。我们展示了该系统的产品质量实现,并报告了在现实环境中的部署经验,包括自动驾驶和机器人导航。CurveLight始终提供厘米级的精度和低延迟,是现实系统中具有挑战性的混合导航解决方案的关键组成部分。
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引用次数: 3
Environmental Impact on the Long-Term Connectivity and Link Quality of an Outdoor LoRa Network 环境对室外LoRa网络长期连通性和链路质量的影响
Pub Date : 2021-11-15 DOI: 10.1145/3485730.3493696
Pei Tian, Fengxu Yang, Xiaoyuan Ma, C. Boano, Xin Tian, Ye Liu, Jianming Wei
Recently, several datasets shedding light on connectivity aspects in real-world LoRa networks have been provided to the community. However, they typically only involve a limited number of nodes, deal with unidirectional communication only, or focus on very specific physical layer settings. More importantly, existing datasets typically lack fine-grained environmental information such as the temperature in the surroundings of each node, which is known to have a strong impact on communication performance. In this work, we provide the community with a comprehensive dataset that fills all these gaps. We have collected detailed connectivity information in an outdoor LoRa network composed of 21 nodes for more than four months. Our dataset does not only focus on network-level performance (e.g., the average number of correctly-exchanged packets), but sheds light on link-level information such as the received signal strength, signal-to-noise ratio, and the number of available neighbours over time. We further collect environmental information from an online weather site, as well as the on-board temperature of each node in the network, which varies considerably across the deployed locations. We collect all this information while perpetually changing physical layer settings such as the spreading factor and the RF channel. A preliminary analysis of our dataset, which is available in Zenodo1, reveals that temperature has a significant correlation with the link quality and connectivity in the outdoor LoRa network, confirming the findings of earlier studies.
最近,已经向社区提供了几个数据集,这些数据集揭示了现实世界LoRa网络中的连接方面。然而,它们通常只涉及有限数量的节点,只处理单向通信,或者专注于非常特定的物理层设置。更重要的是,现有的数据集通常缺乏细粒度的环境信息,如每个节点周围的温度,这对通信性能有很大的影响。在这项工作中,我们为社区提供了一个全面的数据集,填补了所有这些空白。我们收集了21个节点组成的室外LoRa网络4个多月的详细连接信息。我们的数据集不仅关注网络级性能(例如,正确交换数据包的平均数量),还揭示了链路级信息,如接收信号强度、信噪比和可用邻居的数量。我们进一步从一个在线天气网站收集环境信息,以及网络中每个节点的机载温度,这些温度在不同的部署地点差异很大。我们收集所有这些信息,同时不断改变物理层设置,如扩频因子和射频信道。对我们的数据集(在Zenodo1中可用)的初步分析表明,温度与室外LoRa网络的链路质量和连通性有显著相关性,证实了早期研究的结果。
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引用次数: 3
COCOON: A Conductive Substrate-based Coupled Oscillator Network for Wireless Communication 茧:一种基于导电基板的无线通信耦合振荡器网络
Pub Date : 2021-11-15 DOI: 10.1145/3485730.3485940
Xingda Chen, Deepak Ganesan, Jeremy Gummeson, Mohammad Rostami
Advances in flexible conductive substrates such as conductive wallpaper and paint present new opportunities for optimizing the performance of IoT nodes in smart homes and buildings. In this paper, we explore an unconventional use of such substrates for pulling frequencies of oscillators across IoT devices and wireless front-ends connected to the substrate. We show that by using this technique, we can replace precise crystal oscillators by lower precision and lower cost ceramic oscillators without compromising their ability to be used for tasks that require precise frequencies such as frequency-synchronized multi-static backscatter and synchronized sampling. We present an end-to-end design including a) analysis of conditions under which frequency pulling of oscillators across conductive substrates can work, b) a new technique to detect frequency locking across oscillators without requiring explicit communication, and c) an adaptive method that can be used to synchronize oscillators at minimum power consumption. We then show that these elements can be composed to design a high-performance multi-static backscatter system that performs as well as one that uses a shared high-precision clock but at an order of magnitude less monetary cost. We show that our system can scale and operate at very low power, while having low complexity since it requires no explicit interaction among devices attached to the substrate.
导电墙纸和涂料等柔性导电基材的进步为优化智能家居和建筑中物联网节点的性能提供了新的机会。在本文中,我们探索了这种基板的非常规用途,用于跨物联网设备和连接到基板的无线前端的振荡器频率。我们表明,通过使用这种技术,我们可以用更低精度和更低成本的陶瓷振荡器取代精确的晶体振荡器,而不会影响它们用于需要精确频率的任务的能力,如频率同步多静态背散射和同步采样。我们提出了一个端到端设计,包括a)分析振荡器在导电基板上的频率牵引可以工作的条件,b)一种不需要明确通信即可检测振荡器频率锁定的新技术,以及c)一种可用于以最小功耗同步振荡器的自适应方法。然后,我们展示了这些元素可以组成一个高性能的多静态后向散射系统,该系统的性能与使用共享高精度时钟的系统一样好,但货币成本更低。我们表明,我们的系统可以在非常低的功耗下扩展和运行,同时具有低复杂性,因为它不需要连接到基板上的设备之间的显式交互。
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引用次数: 3
Enhanced Virtual Reality: Exploring an Immersive and Realistic Virtual Reality Training for Nursing 增强虚拟现实:探索一种沉浸式、逼真的虚拟现实护理培训
Pub Date : 2021-11-15 DOI: 10.1145/3485730.3492870
Xinmin Fang, Xingyu Chen, Wenyao Xu, Zhengxiong Li
Virtual Reality (VR) training is an emerging method, which is widely deployed in more and more applications. Compared with traditional physical training and video games-based training, VR training can not only provide a sense of realism and immersion similar to physical training but can also train at any time and place, saving time and money. However, due to some constraints like lacking reflections of the ambient environment, the realism and immersion of VR training are insufficient. Therefore, in this paper, we propose enhanced VR training which senses the ambient environment and reflects them as dynamic unexpected training tasks to solve the above problems.
虚拟现实(VR)训练是一种新兴的训练方法,在越来越多的应用中得到了广泛的应用。与传统的体能训练和基于视频游戏的训练相比,VR训练不仅可以提供类似体能训练的真实感和沉浸感,而且可以在任何时间和地点进行训练,节省了时间和金钱。然而,由于缺乏对周围环境的反射等限制,VR训练的真实感和沉浸感不足。因此,为了解决上述问题,本文提出了增强的VR训练,即感知周围环境并将其反映为动态的意外训练任务。
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引用次数: 0
Robust and Affordable Deep Learning Models for Multimodal Sensor Fusion 多模态传感器融合的鲁棒且经济的深度学习模型
Pub Date : 2021-11-15 DOI: 10.1145/3485730.3492897
Sanju Xaviar
Deep fusion networks have received considerable attention lately due to the growing adoption of IoT devices, smartphones, and wearables that incorporate multiple sensing modalities, and their promising applications from human activity recognition to smart home automation. Despite recent advances in this area, there are several practical requirements that are often overlooked. Specifically, fusion networks must maintain their performance during momentary and long-term changes in the environment, be robust to sensor data quality issues, and have a reasonable size so that they can be deployed on resource-constrained devices. My PhD research aims to address these challenges by building robust multimodal fusion networks that rapidly generalize to new environments and have a smaller number of trainable weights, hence lower memory and carbon footprints.
深度融合网络最近受到了相当大的关注,因为越来越多的物联网设备、智能手机和可穿戴设备采用了多种传感模式,以及它们从人类活动识别到智能家居自动化的有前途的应用。尽管这一领域最近取得了进展,但仍有一些实际要求经常被忽视。具体来说,融合网络必须在环境的瞬间和长期变化中保持其性能,对传感器数据质量问题具有鲁棒性,并且具有合理的尺寸,以便可以部署在资源受限的设备上。我的博士研究旨在通过构建强大的多模态融合网络来解决这些挑战,该网络可以快速泛化到新环境中,并且具有更少的可训练权重,从而降低内存和碳足迹。
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引用次数: 0
Exploring Co-dependency of IoT Data Quality and Model Robustness in Precision Cattle Farming 探讨精准养牛中物联网数据质量和模型鲁棒性的相互依赖性
Pub Date : 2021-11-15 DOI: 10.1145/3485730.3493447
F. Papst, K. Schodl, O. Saukh
Low-cost sensors are extensively used in numerous Internet of Things (IoT) applications to measure relevant physical processes. Today, processing context data is increasingly done by proprietary algorithms tuned to a specific use-case, e.g., a sensor measuring activity intensity of a cow. Readings from these sensors may be subject to data distribution shifts, which challenge robustness of models using these sensor readings. In this paper, we propose a new sensor data processing framework, which leverages a co-dependency between data quality and model robustness to detect performance issues of data-driven predictive models in the field. We show how distribution shifts in the input data impact the quality of the model, which relies on application-specific sensors, and present indicators capable of detecting such shifts in the wild. The proposed framework used in the context of precision cattle farming allows improving the quality of cow lameness predictive models on the field data by up to 62%.
低成本传感器广泛应用于众多物联网(IoT)应用中,用于测量相关的物理过程。如今,上下文数据的处理越来越多地通过针对特定用例的专有算法来完成,例如,测量奶牛活动强度的传感器。这些传感器的读数可能会受到数据分布变化的影响,这对使用这些传感器读数的模型的鲁棒性提出了挑战。在本文中,我们提出了一个新的传感器数据处理框架,它利用数据质量和模型鲁棒性之间的相互依赖性来检测该领域数据驱动的预测模型的性能问题。我们展示了输入数据中的分布变化如何影响模型的质量,模型依赖于特定于应用程序的传感器,并提供了能够在野外检测这种变化的指标。在精确养牛的背景下使用的拟议框架允许在现场数据上提高牛跛行预测模型的质量高达62%。
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引用次数: 2
Blockchain-based Decentralized Service Provisioning in Local 6G Mobile Networks 基于区块链的本地6G移动网络分散式服务配置
Pub Date : 2021-11-15 DOI: 10.1145/3485730.3493821
T. Maksymyuk, Marcel Volosin, J. Gazda, Madhusanka Liyanage
The paper presents a novel vision on the application of blockchain technology to empower the dynamic service provisioning in future 6G mobile networks. We propose a platform for decentralized service level agreement (SLA) negotiation between users and mobile network operators (MNOs) based on smart contracts and cryptocurrencies. In addition, the new quality of experience (QoE) model is proposed for end-users to customize their trade-off between SLA and service price. Finally, we develop the method of dynamic service selection among multiple MNOs that provides border-less connectivity for end-users with the guaranteed QoE regardless of the serving MNO.
本文提出了区块链技术应用的新愿景,以增强未来6G移动网络中的动态服务供应。我们提出了一个基于智能合约和加密货币的用户和移动网络运营商(MNOs)之间的去中心化服务水平协议(SLA)谈判平台。此外,提出了新的体验质量(QoE)模型,供最终用户定制SLA与服务价格之间的权衡。最后,我们开发了在多个MNO之间动态服务选择的方法,该方法为终端用户提供无边界连接,无论服务的MNO是什么,都能保证QoE。
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引用次数: 4
Experimental Scalability Study of Consortium Blockchains with BFT Consensus for IoT Automotive Use Case 物联网汽车用例中具有BFT共识的联盟区块链实验可扩展性研究
Pub Date : 2021-11-15 DOI: 10.1145/3485730.3493374
L. Gerrits, C. Samuel, Roland Kromes, F. Verdier, Severine Glock, P. Guitton-Ouhamou
Private or consortium blockchain networks have fewer verified participants and offer better throughput and transaction efficiency than public networks. However, as more and more blockchain consensuses are designed for private or consortium networks, their performances are often estimated without a practical use case implementation. In our use case, participants do not have to trust each other but still work together to build an ecosystem where users control their data and information. This paper analyzes the performance (transaction throughput, rejections, node participants) of Byzantine Fault Tolerant Consensus (BFT) using two blockchains: Hyperledger Sawtooth and Ethereum.
私有或联盟区块链网络具有较少的经过验证的参与者,并且提供比公共网络更好的吞吐量和交易效率。然而,随着越来越多的区块链共识被设计用于私有或联盟网络,它们的性能通常在没有实际用例实现的情况下进行估计。在我们的用例中,参与者不必相互信任,但仍然可以共同构建一个生态系统,用户可以控制他们的数据和信息。本文使用Hyperledger Sawtooth和以太坊两个区块链分析了拜占庭容错共识(BFT)的性能(交易吞吐量、拒绝率、节点参与者)。
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引用次数: 3
MoRe-Fi: Motion-robust and Fine-grained Respiration Monitoring via Deep-Learning UWB Radar MoRe-Fi:基于深度学习超宽带雷达的运动鲁棒和细粒度呼吸监测
Pub Date : 2021-11-15 DOI: 10.1145/3485730.3485932
Tianyue Zheng, Zhe Chen, Shujie Zhang, Chao Cai, Jun Luo
Crucial for healthcare and biomedical applications, respiration monitoring often employs wearable sensors in practice, causing inconvenience due to their direct contact with human bodies. Therefore, researchers have been constantly searching for contact-free alternatives. Nonetheless, existing contact-free designs mostly require human subjects to remain static, largely confining their adoptions in everyday environments where body movements are inevitable. Fortunately, radio-frequency (RF) enabled contact-free sensing, though suffering motion interference inseparable by conventional filtering, may offer a potential to distill respiratory waveform with the help of deep learning. To realize this potential, we introduce MoRe-Fi to conduct fine-grained respiration monitoring under body movements. MoRe-Fi leverages an IR-UWB radar to achieve contact-free sensing, and it fully exploits the complex radar signal for data augmentation. The core of MoRe-Fi is a novel variational encoder-decoder network; it aims to single out the respiratory waveforms that are modulated by body movements in a non-linear manner. Our experiments with 12 subjects and 66-hour data demonstrate that MoRe-Fi accurately recovers respiratory waveform despite the interference caused by body movements. We also discuss potential applications of MoRe-Fi for pulmonary disease diagnoses.
呼吸监测对于医疗保健和生物医学应用至关重要,在实践中经常使用可穿戴传感器,由于它们与人体直接接触而造成不便。因此,研究人员一直在不断寻找无接触的替代品。尽管如此,现有的无接触设计大多要求人体受试者保持静止,这在很大程度上限制了它们在日常环境中的应用,因为身体运动是不可避免的。幸运的是,射频(RF)支持的无接触传感,尽管受到传统滤波不可分割的运动干扰,但可能提供了在深度学习的帮助下提取呼吸波形的潜力。为了实现这一潜力,我们引入MoRe-Fi在身体运动下进行细粒度呼吸监测。MoRe-Fi利用IR-UWB雷达实现无接触传感,并充分利用复杂的雷达信号进行数据增强。MoRe-Fi的核心是一种新型的变分编码器-解码器网络;它旨在挑出由身体运动以非线性方式调制的呼吸波形。我们对12名受试者进行了66小时的实验,结果表明,尽管受到身体运动的干扰,MoRe-Fi仍能准确地恢复呼吸波形。我们还讨论了MoRe-Fi在肺部疾病诊断中的潜在应用。
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引用次数: 43
Ultrasound Tomography for Monitoring the Lower Urinary Tract 超声断层扫描监测下尿路
Pub Date : 2021-11-15 DOI: 10.1145/3485730.3492887
D. Wójcik, T. Rymarczyk, E. Kozłowski, M. Gołąbek, M. Guzik
This research aimed to develop a high accuracy machine learning algorithm that can diagnose cardiovascular diseases from the stream of data from multiple body surface potential mapping devices equipped with 102 textile electrodes. The algorithm is based on the 1D convolutional neural network, trained on the comparable real-life data gathered from the FLUKE ECG simulator connected to the resistance-based human phantom. The developed neural network achieved an accuracy of 99.91% on the test data. Additionally, an additional algorithm was developed that can use the neural network to analyse the data streamed from the medical device and notice the medical staff about dangerous heart rhythms detected by the system.
本研究旨在开发一种高精度的机器学习算法,该算法可以从配备102个纺织电极的多个体表电位测绘设备的数据流中诊断心血管疾病。该算法基于一维卷积神经网络,并根据连接到基于电阻的人体幻影的FLUKE ECG模拟器收集的可比现实数据进行训练。所开发的神经网络在测试数据上的准确率达到99.91%。此外,还开发了一种额外的算法,可以使用神经网络分析来自医疗设备的数据流,并通知医务人员系统检测到的危险心律。
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引用次数: 3
期刊
Proceedings of the 19th ACM Conference on Embedded Networked Sensor Systems
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