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Adjunct Proceedings of the 2020 ACM International Joint Conference on Pervasive and Ubiquitous Computing and Proceedings of the 2020 ACM International Symposium on Wearable Computers最新文献

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A multi-person respiration monitoring system using COTS wifi devices 使用COTS wifi设备的多人呼吸监测系统
Youwei Zeng, Zhaopeng Liu, Dan Wu, Jinyi Liu, Jie Zhang, Daqing Zhang
In recent years, we have seen efforts made to simultaneously monitor the respiration of multiple persons based on the channel state information (CSI) retrieved from commodity WiFi devices. However, existing approaches only work when multiple persons exhibit dramatically different respiration rates and the performance degrades significantly when the targeted subjects have similar rates. What's more, they can only obtain the average respiration rate over a period of time and fail to capture the detailed rate change over time. These two constraints greatly limit the application of the proposed approaches in real life. Different from the existing approaches that apply spectral analysis to the CSI amplitude (or phase difference) to obtain respiration rate information, we leverage the multiple antennas provided by the commodity WiFi hardware and model the multi-person respiration sensing as a blind source separation (BSS) problem. Then, we solve it using independent component analysis (ICA) to obtain the reparation information of each person. In this demo, we will demonstrate MultiSense - a multi-person respiration monitoring system using COTS WiFi devices.
近年来,我们已经看到了基于从商品WiFi设备检索的通道状态信息(CSI)同时监测多人呼吸的努力。然而,现有的方法仅在多人表现出显著不同的呼吸速率时才有效,而当目标受试者的呼吸速率相似时,效果会显著下降。更重要的是,它们只能获得一段时间内的平均呼吸速率,而不能捕捉到随时间变化的详细速率。这两个约束极大地限制了所提出的方法在现实生活中的应用。不同于现有的将频谱分析应用于CSI振幅(或相位差)来获得呼吸速率信息的方法,我们利用商用WiFi硬件提供的多天线,并将多人呼吸传感建模为盲源分离(BSS)问题。然后利用独立分量分析(ICA)对其进行求解,得到每个人的修复信息。在这个演示中,我们将演示MultiSense -一个使用COTS WiFi设备的多人呼吸监测系统。
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引用次数: 8
Improving activity data collection with on-device personalization using fine-tuning 使用微调改进设备上个性化的活动数据收集
Nattaya Mairittha, Tittaya Mairittha, Sozo Inoue
One of the biggest challenges of activity data collection is the unavoidability of relying on users and keep them engaged to provide labels consistently. Recent breakthroughs in mobile platforms have proven effective in bringing deep neural networks powered intelligence into mobile devices. In this study, we propose on-device personalization using fine-tuning convolutional neural networks as a mechanism in optimizing human effort in data labeling. First, we transfer the knowledge gained by on-cloud pre-training based on crowdsourced data to mobile devices. Second, we incrementally fine-tune a personalized model on every individual device using its locally accumulated input. Then, we utilize estimated activities customized according to the on-device model inference as feedback to motivate participants to improve data labeling. We conducted a verification study and gathered activity labels with smartphone sensors. Our preliminary evaluation results indicate that the proposed method outperformed the baseline method by approximately 8% regarding accuracy recognition.
活动数据收集的最大挑战之一是不可避免地依赖于用户,并让他们始终如一地提供标签。移动平台的最新突破已被证明有效地将深度神经网络驱动的智能带入移动设备。在这项研究中,我们提出使用微调卷积神经网络作为优化人类数据标记工作的机制。首先,我们将基于众包数据的云上预训练获得的知识转移到移动设备上。其次,我们使用每个设备的本地累积输入,逐步微调个性化模型。然后,我们利用根据设备上模型推断定制的估计活动作为反馈来激励参与者改进数据标记。我们进行了一项验证研究,并收集了智能手机传感器的活动标签。我们的初步评估结果表明,所提出的方法在准确率识别方面优于基线方法约8%。
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引用次数: 5
Feature based random forest nurse care activity recognition using accelerometer data 基于特征的随机森林护理活动识别,利用加速度计数据
Carolin Lübbe, Björn Friedrich, Sebastian J. F. Fudickar, S. Hellmers, A. Hein
The The 2nd Nurse Care Activity Recognition Challenge Using Lab and Field Data addresses the important issue about care and the need for assistance systems in the nursing profession like automatic documentation systems. Data of 12 different care activities were recorded with an accelerometer attached to the right arm of the nurses. Both, laboratory and field data were taken into account. The task was to classify each activity based on the accelerometer data. We participated as team Gudetama in the challenge. We trained a Random Forest classifier and achieved an accuracy of 61.11% on our internal test set.
使用实验室和现场数据的第二次护士护理活动识别挑战解决了关于护理的重要问题和护理专业中对辅助系统(如自动文档系统)的需求。12种不同护理活动的数据用附着在护士右臂上的加速度计记录下来。同时考虑了实验室和现场数据。任务是根据加速度计的数据对每个活动进行分类。我们作为瓜德玛队参加了这次挑战。我们训练了一个随机森林分类器,在我们的内部测试集上达到了61.11%的准确率。
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引用次数: 4
Deep learning for cognitive load monitoring: a comparative evaluation 认知负荷监测的深度学习:比较评价
Andrea Salfinger
The Cognitive Load Monitoring Challenge organized in the UbiTtention 2020 workshop tasked the research community with the problem of inferring a user's cognitive load from physiological measurements recorded by a low-cost wearable. This is challenging due to the subjective nature of these physiological characteristics: In contrast to related problems involving objective measurements of physical phenomena (e.g., Activity Recognition from smartphone sensors), subjects' physiological response patterns under cognitive load may be highly individual, i.e., expose significant inter-subject variance. However, models trained on datasets compiled in laboratory settings should also deliver accurate classifications when applied to measurements from novel subjects. In this work, we study the applicability of established Deep Learning models for time series classification on this challenging problem. We examine different kinds of data normalization and investigate a variant of data augmentation.
在UbiTtention 2020研讨会上组织的认知负荷监测挑战向研究界提出了一个问题,即从低成本可穿戴设备记录的生理测量中推断用户的认知负荷。由于这些生理特征的主观性质,这是具有挑战性的:与涉及物理现象客观测量的相关问题(例如,智能手机传感器的活动识别)相比,认知负荷下受试者的生理反应模式可能是高度个体的,即暴露出显着的受试者间差异。然而,在实验室环境中编译的数据集上训练的模型在应用于来自新对象的测量时也应该提供准确的分类。在这项工作中,我们研究了建立的深度学习模型对时间序列分类的适用性。我们研究了不同类型的数据规范化,并研究了数据增强的一种变体。
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引用次数: 4
A physical knowledge-based extreme learning machine approach to fault diagnosis of rolling element bearing from small datasets 基于物理知识的极限学习机小数据集滚动轴承故障诊断方法
Tianyun Liu, Li Kou, Le Yang, Wenhui Fan, Cheng Wu
The learning-based methods have been widely applied to design a fault diagnosis model for rolling element bearing. However, the mainstream methods can only deal with the large training dataset, which is always violated in practical application. In this paper, we propose a physical knowledge-based hierarchical extreme learning machine(H-ELM) approach to adapt the problem of fault diagnosis for bearing with the small and imbalanced dataset. First, the proposed method uses the simple feature extraction algorithm to build a knowledge base for sample selection from the historical database, and the given training dataset is augmented with knowledge base. Second, a modified H-ELM algorithm is developed to identify fault location and recognize fault severity ranking based on the augmented dataset. Third, we design a self-optimizing module to optimize the sample selection and improve the performance of the H-ELM network. To evaluate the effectiveness of the proposed approach, the H-ELM without knowledge base and data augmentation-based support vector machine(SVM), back propagation neuron networks(BPNN) and deep belief networks(DBN) are tested in the numerical experiments to present a comprehensive comparison. The experimental results demonstrate that our approach outperforms in accuracy than other counterparts when dealing with the small and imbalanced datasets.
基于学习的方法已被广泛应用于滚动轴承故障诊断模型的设计。然而,主流方法只能处理大型训练数据集,这在实际应用中经常被违反。在本文中,我们提出了一种基于物理知识的层次极限学习机(H-ELM)方法来适应小而不平衡数据集的轴承故障诊断问题。该方法首先利用简单的特征提取算法从历史数据库中建立样本选择知识库,并对给定的训练数据集进行知识库扩充;其次,基于增强数据集,提出改进的H-ELM算法进行故障定位和故障严重等级识别;第三,设计自优化模块,优化样本选择,提高H-ELM网络的性能。为了评估该方法的有效性,在数值实验中对无知识库的H-ELM和基于数据增强的支持向量机(SVM)、反向传播神经元网络(BPNN)和深度信念网络(DBN)进行了全面比较。实验结果表明,在处理小数据集和不平衡数据集时,我们的方法的准确性优于其他同类方法。
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引用次数: 1
Complex nurse care activity recognition using statistical features 基于统计特征的复杂护理活动识别
Promit Basak, Shahamat Mustavi Tasin, Malisha Islam Tapotee, Md. Mamun Sheikh, A. Sakib, Sriman Bidhan Baray, M. Ahad
Human activity recognition has important applications in healthcare, human-computer interactions and other arenas. The direct interaction between the nurse and patient can play a pivotal role in healthcare. Recognizing various activities of nurses can improve healthcare in many ways. However, it is a very daunting task due to the complexities of the activities. "The 2nd Nurse Care Activity Recognition Challenge Using Lab and Field Data'' provides sensor-based accelerometer data to predict 12 activities conducted by the nurses in both the lab and real-life settings. The main difficulty of this dataset is to process the raw data because of a high imbalance among different classes. Besides, all activities have not been performed by all subjects. Our team, 'Team Apophis' has processed the data by filtering noise, applying windowing technique on time and frequency domain to extract various features from lab and field data distinctly. After merging lab and field data, the 10-fold cross-validation technique has been applied to find out the model of best performance. We have obtained a promising accuracy of 65% with an F1 score of 40% on this challenging dataset by using the Random Forest classifier.
人体活动识别在医疗保健、人机交互等领域有着重要的应用。护士和病人之间的直接互动在医疗保健中起着举足轻重的作用。承认护士的各种活动可以在许多方面改善医疗保健。然而,由于活动的复杂性,这是一项非常艰巨的任务。“第二届护士护理活动识别挑战使用实验室和现场数据”提供基于传感器的加速度计数据,以预测护士在实验室和现实环境中进行的12项活动。由于不同类别之间的高度不平衡,该数据集的主要困难在于处理原始数据。此外,并不是所有的受试者都完成了所有的活动。我们的团队“team Apophis”对数据进行了处理,通过过滤噪声,应用时域和频域的窗口技术,从实验室和现场数据中清晰地提取出各种特征。在合并实验室和现场数据后,应用10倍交叉验证技术找出最佳性能模型。通过使用随机森林分类器,我们在这个具有挑战性的数据集上获得了65%的准确度和40%的F1分数。
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引用次数: 6
Appliance fingerprinting using sound from power supply 利用电源发出的声音进行电器指纹识别
Lanqing Yang, Honglu Li, Zhaoxi Chen, Xiaoyu Ji, Yi-Chao Chen, Guangtao Xue, Chuang-Wen You
Recognizing the working appliances is of great importance for smart environment to provide services including energy conservation, user activity recognition, fire hazard prevention, etc. There have been many methods proposed to recognize appliances by analyzing the power voltage, current, electromagnetic emissions, vibration, light, and sound from appliances. Among these methods, measuring the power voltage and current requires installing intrusive sensors to each appliance. Measuring the electromagnetic emissions and vibration requires sensors to be attached or close (e.g., < 15cm) to the appliances. Methods relying on light are not universally applicable since only part of appliances generate light. Similarly, methods using sound relying on the sound from motor vibration or mechanical collision so are not applicable for many appliances. As a result, existing methods for appliance fingerprinting are intrusive, have high deployment cost, or only work for part of appliances. In this work, we proposed to use the inaudible high-frequency sound generated by the switching-mode power supply (SMPS) of the appliances as fingerprints to recognize appliances. Since SMPS is widely adopted in home appliances, the proposed method can work for most appliances. Our preliminary experiments on 18 household appliances (where 10 are of the same models) showed that the recognition accuracy achieves 97.6%.
识别工作设备对于智能环境提供节能、用户活动识别、防火等服务具有重要意义。已经提出了许多方法,通过分析电器的电压、电流、电磁发射、振动、光和声音来识别电器。在这些方法中,测量电源电压和电流需要在每个设备上安装侵入式传感器。测量电磁发射和振动需要传感器连接或靠近(例如,< 15cm)到设备。依靠光的方法不是普遍适用的,因为只有部分器具产生光。同样,依靠电机振动或机械碰撞产生的声音的方法也不适用于许多电器。因此,现有的设备指纹识别方法具有侵入性,部署成本高,或者仅适用于设备的一部分。在这项工作中,我们提出利用电器开关电源(SMPS)产生的听不见的高频声音作为指纹来识别电器。由于SMPS在家用电器中被广泛采用,因此所提出的方法适用于大多数电器。我们对18个家用电器(其中10个型号相同)进行初步实验,识别准确率达到97.6%。
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引用次数: 3
Facial expression based satisfaction index for empathic buildings 基于面部表情的共情建筑满意度指数
Fahad Sohrab, Jenni Raitoharju, M. Gabbouj
In this work, we examine the suitability of automatic facial expression recognition to be used for satisfaction analysis in an Empathic Building environment. We use machine learning based facial expression recognition on the working stations to integrate an online satisfaction index into Empathic Building platform. To analyze the suitability of facial expression recognition to reflect longer-term satisfaction, we examine the changes and trends in the happiness curves of our test users. We also correlate the happiness curve with temperature, humidity, and light intensity of the test users' local city (Tampere Finland). The results indicate that the proposed analysis indeed shows some trends that may be used for long-term satisfaction analysis in different kinds of intelligent buildings.
在这项工作中,我们研究了自动面部表情识别在共情建筑环境中用于满意度分析的适用性。我们在工作站使用基于机器学习的面部表情识别,将在线满意度指数整合到移情建设平台中。为了分析面部表情识别是否适合反映长期满意度,我们考察了测试用户的幸福曲线的变化和趋势。我们还将幸福曲线与测试用户所在城市(芬兰坦佩雷)的温度、湿度和光照强度联系起来。结果表明,所提出的分析确实显示了一些趋势,可用于不同类型智能建筑的长期满意度分析。
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引用次数: 1
A multi-view architecture for the SHL challenge 针对SHL挑战的多视图体系结构
Massinissa Hamidi, A. Osmani, Pegah Alizadeh
To recognize locomotion and transportation modes in a user-independent manner with an unknown target phone position, we (team Eagles) propose an approach based on two main steps: reduction of the impact of regular effects that stem from each phone position, followed by the recognition of the appropriate activity. The general architecture is composed of three groups of neural networks organized in the following order. The first group allows the recognition of the source, the second group allows the normalization of data to neutralize the impact of the source on the activity learning process, and the last group allows the recognition of the activity itself. We perform extensive experiments and the preliminary results encourage us to follow this direction, including the source learning to reduce the phone position's biases and activity separately.
为了以用户独立的方式识别未知目标手机位置的移动和运输模式,我们(团队Eagles)提出了一种基于两个主要步骤的方法:减少来自每个手机位置的常规影响的影响,然后识别适当的活动。总体架构由按以下顺序组织的三组神经网络组成。第一组允许对源进行识别,第二组允许对数据进行规范化,以抵消源对活动学习过程的影响,最后一组允许对活动本身进行识别。我们进行了大量的实验,初步的结果鼓励我们遵循这个方向,包括源学习分别减少手机位置的偏差和活动。
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引用次数: 6
Respiratory events screening using consumer smartwatches 使用消费者智能手表进行呼吸事件筛查
Illia Fedorin, Kostyantyn Slyusarenko, Margaryta Nastenko
Respiratory related events (RE) during nocturnal sleep disturb the natural physiological pattern of sleep. This events may include all types of apnea and hypopnea, respiratory-event-related arousals and snoring. The particular importance of breath analysis is currently associated with the COVID-19 pandemic. The proposed algorithm is a deep learning model with long short-term memory cells for RE detection for each 1 minute epoch during nocturnal sleep. Our approach provides the basis for a smartwatch based respiratory-related sleep pattern analysis (accuracy of epoch-by-epoch classification is greater than 80 %), can be applied for a potential risk of respiratory-related diseases screening (mean absolute error of AHI estimation is about 6.5 events/h on the test set, which includes participants with all types of apnea severity; two class screening accuracy (AHI threshold is 15 events/h) is greater than 90 %).
夜间睡眠中的呼吸相关事件(RE)扰乱了睡眠的自然生理模式。这些事件可能包括所有类型的呼吸暂停和低呼吸,呼吸事件相关的觉醒和打鼾。呼吸分析的特别重要性目前与COVID-19大流行有关。提出的算法是一个深度学习模型,具有长短期记忆细胞,用于夜间睡眠中每1分钟epoch的RE检测。我们的方法为基于智能手表的呼吸相关睡眠模式分析提供了基础(逐epoch分类准确率大于80%),可用于呼吸相关疾病的潜在风险筛查(在测试集中,AHI估计的平均绝对误差约为6.5事件/小时,其中包括所有类型的呼吸暂停严重程度的参与者;二级筛查准确率(AHI阈值为15个事件/小时)大于90%。
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引用次数: 4
期刊
Adjunct Proceedings of the 2020 ACM International Joint Conference on Pervasive and Ubiquitous Computing and Proceedings of the 2020 ACM International Symposium on Wearable Computers
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