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FSS-Tag FSS 日
Q2 COMPUTER SCIENCE, INFORMATION SYSTEMS Pub Date : 2024-01-12 DOI: 10.1145/3631457
Liqiong Chang, Xiaofeng Yang, Ruyue Liu, Guodong Xie, Fuwei Wang, Ju Wang
Material sensing is crucial in many emerging applications, such as waste classification and hazardous material detection. Although existing Radio Frequency (RF) signal based systems achieved great success, they have limited identification accuracy when either RF signals can not penetrate through a target or a target has different outer and inner materials. This paper introduces a Frequency Selective Surface (FSS) tag based high accuracy material identification system, namely FSS-Tag, which utilises both the penetrating signals and the coupling effect. Specifically, we design and attach a FSS tag to a target, and use frequency responses of the tag for material sensing, since different target materials have different frequency responses. The key advantage of our system is that, when RF signals pass through a target with the FSS tag, the penetrating signal responds more to the inner material, and the coupling effect (between the target and the tag) reflects more about the outer material; thus, one can achieve a higher sensing accuracy. The challenge lies in how to find optimal tag design parameters so that the frequency response of different target materials can be clearly distinguished. We address this challenge by establishing a tag parameter optimization model. Real-world experiments show that FSS-Tag achieves more than 91% accuracy on identifying eight common materials, and improves the accuracy by up to 38% and 8% compared with the state of the art (SOTA) penetrating signal based method TagScan and the SOTA coupling effect based method Tagtag.
在许多新兴应用领域,如垃圾分类和危险材料检测中,材料传感至关重要。虽然现有的基于射频(RF)信号的系统取得了巨大成功,但在射频信号无法穿透目标或目标内外材料不同的情况下,它们的识别精度有限。本文介绍了一种基于频率选择性表面(FSS)标签的高精度材料识别系统,即 FSS-Tag,它同时利用了穿透信号和耦合效应。具体来说,我们设计了一个 FSS 标签并将其贴在目标上,然后利用标签的频率响应进行材料感应,因为不同的目标材料具有不同的频率响应。我们系统的主要优势在于,当射频信号穿过带有 FSS 标签的目标时,穿透信号更多地响应内部材料,而耦合效应(目标与标签之间)更多地反映外部材料;因此,我们可以实现更高的传感精度。目前的挑战在于如何找到最佳的标签设计参数,从而明确区分不同目标材料的频率响应。我们通过建立标签参数优化模型来解决这一难题。实际实验表明,FSS-Tag 对八种常见材料的识别准确率超过 91%,与基于穿透信号的最新方法 TagScan 和基于耦合效应的最新方法 Tagtag 相比,准确率分别提高了 38% 和 8%。
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引用次数: 0
UniFi UniFi
Q2 COMPUTER SCIENCE, INFORMATION SYSTEMS Pub Date : 2024-01-12 DOI: 10.1145/3631429
Yan Liu, Anlan Yu, Leye Wang, Bin Guo, Yang Li, E. Yi, Daqing Zhang
In recent years, considerable endeavors have been devoted to exploring Wi-Fi-based sensing technologies by modeling the intricate mapping between received signals and corresponding human activities. However, the inherent complexity of Wi-Fi signals poses significant challenges for practical applications due to their pronounced susceptibility to deployment environments. To address this challenge, we delve into the distinctive characteristics of Wi-Fi signals and distill three pivotal factors that can be leveraged to enhance generalization capabilities of deep learning-based Wi-Fi sensing models: 1) effectively capture valuable input to mitigate the adverse impact of noisy measurements; 2) adaptively fuse complementary information from multiple Wi-Fi devices to boost the distinguishability of signal patterns associated with different activities; 3) extract generalizable features that can overcome the inconsistent representations of activities under different environmental conditions (e.g., locations, orientations). Leveraging these insights, we design a novel and unified sensing framework based on Wi-Fi signals, dubbed UniFi, and use gesture recognition as an application to demonstrate its effectiveness. UniFi achieves robust and generalizable gesture recognition in real-world scenarios by extracting discriminative and consistent features unrelated to environmental factors from pre-denoised signals collected by multiple transceivers. To achieve this, we first introduce an effective signal preprocessing approach that captures the applicable input data from noisy received signals for the deep learning model. Second, we propose a multi-view deep network based on spatio-temporal cross-view attention that integrates multi-carrier and multi-device signals to extract distinguishable information. Finally, we present the mutual information maximization as a regularizer to learn environment-invariant representations via contrastive loss without requiring access to any signals from unseen environments for practical adaptation. Extensive experiments on the Widar 3.0 dataset demonstrate that our proposed framework significantly outperforms state-of-the-art approaches in different settings (99% and 90%-98% accuracy for in-domain and cross-domain recognition without additional data collection and model training).
近年来,通过对接收信号和相应人类活动之间的复杂映射进行建模,人们致力于探索基于 Wi-Fi 的传感技术。然而,Wi-Fi 信号固有的复杂性给实际应用带来了巨大挑战,因为它们很容易受到部署环境的影响。为了应对这一挑战,我们深入研究了 Wi-Fi 信号的显著特征,并提炼出三个关键因素,可用于增强基于深度学习的 Wi-Fi 感知模型的泛化能力:1)有效捕捉有价值的输入,以减轻噪声测量的不利影响;2)自适应融合来自多个 Wi-Fi 设备的互补信息,以提高与不同活动相关的信号模式的可区分性;3)提取可泛化的特征,以克服不同环境条件(如位置、方向)下活动表征的不一致性。利用这些见解,我们设计了一种基于 Wi-Fi 信号的新型统一传感框架(称为 UniFi),并将手势识别作为一种应用来展示其有效性。UniFi 通过从多个收发器收集到的预先去噪信号中提取与环境因素无关的具有区分性和一致性的特征,在真实世界场景中实现了稳健且可通用的手势识别。为此,我们首先引入了一种有效的信号预处理方法,从嘈杂的接收信号中捕捉适用于深度学习模型的输入数据。其次,我们提出了一种基于时空跨视角注意力的多视角深度网络,它能整合多载波和多设备信号,以提取可区分的信息。最后,我们提出将互信息最大化作为正则化器,通过对比损失来学习环境不变表征,而不需要从未曾见过的环境中获取任何信号来进行实际适应。在 Widar 3.0 数据集上进行的大量实验表明,我们提出的框架在不同环境下的表现明显优于最先进的方法(在不额外收集数据和训练模型的情况下,域内和跨域识别的准确率分别为 99% 和 90%-98%)。
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引用次数: 1
ADA-SHARK ADA-SHARK
Q2 COMPUTER SCIENCE, INFORMATION SYSTEMS Pub Date : 2024-01-12 DOI: 10.1145/3631416
Marvin Martin, Etienne Meunier, P. Moreau, Jean-Eudes Gadenne, J. Dautel, Félicien Catherin, Eugene Pinsky, Reza Rawassizadeh
Due to global warming, sharks are moving closer to the beaches, affecting the risk to humans and their own lives. Within the past decade, several technologies were developed to reduce the risks for swimmers and surfers. This study proposes a robust method based on computer vision to detect sharks using an underwater camera monitoring system to secure coastlines. The system is autonomous, environment-friendly, and requires low maintenance. 43,679 images extracted from 175 hours of videos of marine life were used to train our algorithms. Our approach allows the collection and analysis of videos in real-time using an autonomous underwater camera connected to a smart buoy charged with solar panels. The videos are processed by a Domain Adversarial Convolutional Neural Network to discern sharks regardless of the background environment with an F2-score of 83.2% and a recall of 90.9%, while human experts have an F2-score of 94% and a recall of 95.7%.
由于全球变暖,鲨鱼正在向海滩靠近,从而影响到人类及其自身的生命安全。在过去的十年中,人们开发了多种技术来降低游泳者和冲浪者的风险。本研究提出了一种基于计算机视觉的稳健方法,利用水下摄像监控系统检测鲨鱼,以确保海岸线安全。该系统具有自主性、环保性和低维护要求。从 175 个小时的海洋生物视频中提取的 43,679 幅图像被用于训练我们的算法。我们的方法允许使用连接到太阳能电池板充电的智能浮标的自主水下摄像机实时收集和分析视频。视频经领域对抗卷积神经网络处理后,无论背景环境如何,都能辨别出鲨鱼,其 F2 分数为 83.2%,召回率为 90.9%,而人类专家的 F2 分数为 94%,召回率为 95.7%。
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引用次数: 0
SF-Adapter SF 适配器
Q2 COMPUTER SCIENCE, INFORMATION SYSTEMS Pub Date : 2024-01-12 DOI: 10.1145/3631428
Hua Kang, Qingyong Hu, Qian Zhang
Wearable sensor-based human activity recognition (HAR) has gained significant attention due to the widespread use of smart wearable devices. However, variations in different subjects can cause a domain shift that impedes the scaling of the recognition model. Unsupervised domain adaptation has been proposed as a solution to recognize activities in new, unlabeled target domains by training the source and target data together. However, the need for accessing source data raises privacy concerns. Source-free domain adaptation has emerged as a practical setting, where only a pre-trained source model is provided for the unlabeled target domain. This setup aligns with the need for personalized activity model adaptation on target local devices. As the edge devices are resource-constrained with limited memory, it is crucial to take the computational efficiency, i.e., memory cost into consideration. In this paper, we develop a source-free domain adaptation framework for wearable sensor-based HAR, with a focus on computational efficiency for target edge devices. Firstly, we design a lightweight add-on module called adapter to adapt the frozen pre-trained model to the unlabeled target domain. Secondly, to optimize the adapter, we adopt a simple yet effective model adaptation method that leverages local representation similarity and prediction consistency. Additionally, we design a set of sample selection optimization strategies to select samples effective for adaptation and further enhance computational efficiency while maintaining adaptation performance. Our extensive experiments on three datasets demonstrate that our method achieves comparable recognition accuracy to the state-of-the-art source free domain adaptation methods with fewer than 1% of the parameters updated and saves up to 4.99X memory cost.
由于智能可穿戴设备的广泛使用,基于可穿戴传感器的人类活动识别(HAR)受到了广泛关注。然而,不同主体的变化会导致领域转移,从而阻碍识别模型的扩展。有人提出了一种无监督领域适应解决方案,通过将源数据和目标数据一起训练,在新的、无标记的目标领域中识别活动。然而,访问源数据的需要会引发隐私问题。无源域适配已成为一种实用的设置,在这种设置中,只为未标记的目标域提供预先训练好的源模型。这种设置符合在目标本地设备上进行个性化活动模型适配的需求。由于边缘设备资源有限,内存有限,因此必须考虑计算效率,即内存成本。在本文中,我们为基于传感器的可穿戴 HAR 开发了一个无源域适配框架,重点关注目标边缘设备的计算效率。首先,我们设计了一个名为适配器的轻量级附加模块,用于将冻结的预训练模型适配到未标记的目标领域。其次,为了优化适配器,我们采用了一种简单而有效的模型适配方法,该方法利用了局部表示相似性和预测一致性。此外,我们还设计了一套样本选择优化策略,以选择对适配有效的样本,并在保持适配性能的同时进一步提高计算效率。我们在三个数据集上进行的大量实验证明,我们的方法只需更新不到 1% 的参数,就能达到与最先进的无源域适配方法相当的识别准确率,并节省高达 4.99 倍的内存成本。
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引用次数: 0
Conversational Localization 对话本地化
Q2 COMPUTER SCIENCE, INFORMATION SYSTEMS Pub Date : 2024-01-12 DOI: 10.1145/3631404
Smitha Sheshadri, Kotaro Hara
We propose a novel sensorless approach to indoor localization by leveraging natural language conversations with users, which we call conversational localization. To show the feasibility of conversational localization, we develop a proof-of-concept system that guides users to describe their surroundings in a chat and estimates their position based on the information they provide. We devised a modular architecture for our system with four modules. First, we construct an entity database with available image-based floor maps. Second, we enable the dynamic identification and scoring of information provided by users through our utterance processing module. Then, we implement a conversational agent that can intelligently strategize and guide the interaction to elicit localizationally valuable information from users. Finally, we employ visibility catchment area and line-of-sight heuristics to generate spatial estimates for the user's location. We conduct two user studies in designing and testing the system. We collect 800 natural language descriptions of unfamiliar indoor spaces in an online crowdsourcing study to learn the feasibility of extracting localizationally useful entities from user utterances. We then conduct a field study with 10 participants at 10 locations to evaluate the feasibility and performance of conversational localization. The results show that conversational localization can achieve within-10 meter localization accuracy at eight out of the ten study sites, showing the technique's utility for classes of indoor location-based services.
我们提出了一种利用与用户的自然语言对话进行室内定位的新型无传感器方法,我们称之为对话定位。为了证明对话定位的可行性,我们开发了一个概念验证系统,引导用户在聊天中描述他们周围的环境,并根据他们提供的信息估计他们的位置。我们为系统设计了一个包含四个模块的模块化架构。首先,我们构建了一个实体数据库,其中包含可用的基于图像的楼层地图。其次,我们通过语句处理模块对用户提供的信息进行动态识别和评分。然后,我们实现了一个会话代理,它可以智能地制定策略并引导交互,从用户那里获取有本地化价值的信息。最后,我们采用能见度覆盖区和视线启发法来生成用户位置的空间估计值。我们在设计和测试系统时进行了两项用户研究。在一项在线众包研究中,我们收集了 800 条关于陌生室内空间的自然语言描述,以了解从用户话语中提取对定位有用的实体的可行性。然后,我们在 10 个地点对 10 名参与者进行了实地研究,以评估会话本地化的可行性和性能。研究结果表明,在 10 个研究地点中,有 8 个地点的会话定位可以达到 10 米以内的定位精度,这表明该技术适用于各类室内定位服务。
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引用次数: 0
TrackPose TrackPose
Q2 COMPUTER SCIENCE, INFORMATION SYSTEMS Pub Date : 2024-01-12 DOI: 10.1145/3631459
Ke He, Chentao Li, Yongjie Duan, Jianjiang Feng, Jie Zhou
Several studies have explored the estimation of finger pose/angle to enhance the expressiveness of touchscreens. However, the accuracy of previous algorithms is limited by large estimation errors, and the sequential output angles are unstable, making it difficult to meet the demands of practical applications. We believe the defect arises from improper rotation representation, the lack of time-series modeling, and the difficulty in accommodating individual differences among users. To address these issues, we conduct in-depth study of rotation representation for the 2D pose problem by minimizing the errors between representation space and original space. A deep learning model, TrackPose, using a self-attention mechanism is proposed for time-series modeling to improve accuracy and stability of finger pose. A registration application on a mobile phone is developed to collect touchscreen images of each new user without the use of optical tracking device. The combination of the three measures mentioned above has resulted in a 33% reduction in the angle estimation error, 47% for the yaw angle especially. Additionally, the instability of sequential estimations, measured by the proposed metric MAEΔ, is reduced by 62%. User study further confirms the effectiveness of our proposed algorithm.
一些研究探讨了手指姿势/角度的估计,以增强触摸屏的表现力。然而,以往算法的准确性受限于较大的估计误差,且连续输出的角度不稳定,难以满足实际应用的需求。我们认为,造成这种缺陷的原因是旋转表示不当、缺乏时间序列建模以及难以照顾到用户的个体差异。针对这些问题,我们通过最小化表示空间与原始空间之间的误差,对二维姿势问题的旋转表示进行了深入研究。我们提出了一种深度学习模型 TrackPose,它采用自我关注机制进行时间序列建模,以提高手指姿势的准确性和稳定性。在手机上开发了一个注册应用程序,无需使用光学跟踪设备即可收集每个新用户的触摸屏图像。结合上述三种措施,角度估计误差减少了 33%,尤其是偏航角误差减少了 47%。此外,用提出的指标 MAEΔ 来衡量,连续估计的不稳定性降低了 62%。用户研究进一步证实了我们提出的算法的有效性。
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引用次数: 0
Waffle 华夫饼
Q2 COMPUTER SCIENCE, INFORMATION SYSTEMS Pub Date : 2024-01-12 DOI: 10.1145/3631458
Xusheng Zhang, Duo Zhang, Yaxiong Xie, Dan Wu, Yang Li, Daqing Zhang
The bathroom has consistently ranked among the most perilous rooms in households, with slip and fall incidents during showers posing a critical threat, particularly to the elders. To address this concern while ensuring privacy and accuracy, the mmWave-based sensing system has emerged as a promising solution. Capable of precisely detecting human activities and promptly triggering alarms in response to critical events, it has proved especially valuable within bathroom environments. However, deploying such a system in bathrooms faces a significant challenge: interference from running water. Similar to the human body, water droplets reflect substantial mmWave signals, presenting a major obstacle to accurate sensing. Through rigorous empirical study, we confirm that the interference caused by running water adheres to a Weibull distribution, offering insight into its behavior. Leveraging this understanding, we propose a customized Constant False Alarm Rate (CFAR) detector, specifically tailored to handle the interference from running water. This innovative detector effectively isolates human-generated signals, thus enabling accurate human detection even in the presence of running water interference. Our implementation of "Waffle" on a commercial off-the-shelf mmWave radar demonstrates exceptional sensing performance. It achieves median errors of 1.8cm and 6.9cm for human height estimation and tracking, respectively, even in the presence of running water. Furthermore, our fall detection system, built upon this technique, achieves remarkable performance (a recall of 97.2% and an accuracy of 97.8%), surpassing the state-of-the-art method.
浴室一直是家庭中最危险的房间之一,淋浴时的滑倒和跌倒事件构成了严重威胁,尤其是对老年人。为了解决这一问题,同时确保隐私和准确性,基于毫米波的传感系统已成为一种前景广阔的解决方案。该系统能够精确检测人类活动,并在发生重大事件时及时触发警报,在浴室环境中被证明特别有价值。然而,在浴室中部署这种系统面临着一个重大挑战:流水的干扰。与人体类似,水滴也会反射大量毫米波信号,这对精确感应构成了重大障碍。通过严格的实证研究,我们证实流水造成的干扰符合威布尔分布,从而对其行为有了深入的了解。利用这一认识,我们提出了一种定制的恒定误报率(CFAR)检测器,专门用于处理来自流水的干扰。这种创新型检测器能有效隔离人类产生的信号,因此即使在流水干扰的情况下也能准确检测到人类。我们在商用现成毫米波雷达上实施的 "Waffle "展示了卓越的传感性能。即使在有流水的情况下,它对人体高度估计和跟踪的中值误差分别为 1.8 厘米和 6.9 厘米。此外,我们基于该技术开发的跌倒检测系统性能卓越(召回率为 97.2%,准确率为 97.8%),超过了最先进的方法。
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引用次数: 0
A User-Centered Framework to Empower People with Parkinson's Disease 以用户为中心的帕金森病患者赋权框架
Q2 COMPUTER SCIENCE, INFORMATION SYSTEMS Pub Date : 2024-01-12 DOI: 10.1145/3631430
Wasifur Rahman, Abdelrahman Abdelkader, Sangwu Lee, Phillip T. Yang, Md Saiful Islam, Tariq Adnan, Masum Hasan, Ellen Wagner, Sooyong Park, E. R. Dorsey, Catherine Schwartz, Karen Jaffe, Ehsan Hoque
We present a user-centric validation of a teleneurology platform, assessing its effectiveness in conveying screening information, facilitating user queries, and offering resources to enhance user empowerment. This validation process is implemented in the setting of Parkinson's disease (PD), in collaboration with a neurology department of a major medical center in the USA. Our intention is that with this platform, anyone globally with a webcam and microphone-equipped computer can carry out a series of speech, motor, and facial mimicry tasks. Our validation method demonstrates to users a mock PD risk assessment and provides access to relevant resources, including a chatbot driven by GPT, locations of local neurologists, and actionable and scientifically-backed PD prevention and management recommendations. We share findings from 91 participants (48 with PD, 43 without) aimed at evaluating the user experience and collecting feedback. Our framework was rated positively by 80.85% (standard deviation ± 8.92%) of the participants, and it achieved an above-average 70.42 (standard deviation ± 13.85) System-Usability-Scale (SUS) score. We also conducted a thematic analysis of open-ended feedback to further inform our future work. When given the option to ask any questions to the chatbot, participants typically asked for information about neurologists, screening results, and the community support group. We also provide a roadmap of how the knowledge generated in this paper can be generalized to screening frameworks for other diseases through designing appropriate recording environments, appropriate tasks, and tailored user-interfaces.
我们介绍了一个以用户为中心的远程神经病学平台验证,评估其在传递筛查信息、方便用户查询以及提供资源以增强用户能力方面的有效性。这一验证过程是与美国一家大型医疗中心的神经科合作,在帕金森病(PD)的背景下实施的。我们的目标是,通过这一平台,全球任何拥有网络摄像头和麦克风的电脑用户都能完成一系列语言、运动和面部模仿任务。我们的验证方法向用户展示了模拟的帕金森病风险评估,并提供了访问相关资源的途径,包括由 GPT 驱动的聊天机器人、当地神经科医生的位置,以及可操作且有科学依据的帕金森病预防和管理建议。我们分享了 91 位参与者(48 位患有帕金森病,43 位没有帕金森病)的调查结果,旨在评估用户体验并收集反馈意见。80.85%(标准差 ± 8.92%)的参与者对我们的框架给予了积极评价,其系统可用性量表(SUS)得分高于平均水平 70.42(标准差 ± 13.85)。我们还对开放式反馈进行了专题分析,以便为今后的工作提供更多信息。当参与者可以向聊天机器人提出任何问题时,他们通常会询问有关神经科医生、筛查结果和社区支持小组的信息。我们还提供了一个路线图,说明如何通过设计适当的记录环境、适当的任务和量身定制的用户界面,将本文中生成的知识推广到其他疾病的筛查框架中。
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引用次数: 0
Diagnosing Medical Score Calculator Apps 诊断医疗分数计算器应用程序
Q2 COMPUTER SCIENCE, INFORMATION SYSTEMS Pub Date : 2023-09-27 DOI: 10.1145/3610912
Sydur Rahaman, Raina Samuel, Iulian Neamtiu
Mobile medical score calculator apps are widely used among practitioners to help make decisions regarding patient treatment and diagnosis. Errors in score definition, input, or calculations can result in severe and potentially life-threatening situations. Despite these high stakes, there has been no systematic or rigorous effort to examine and verify score calculator apps. We address these issues via a novel, interval-based score checking approach. Based on our observation that medical reference tables themselves may contain errors (which can propagate to apps) we first introduce automated correctness checking of reference tables. Specifically, we reduce score correctness checking to partition checking (coverage and non-overlap) over score parameters' ranges. We checked 12 scoring systems used in emergency, intensive, and acute care. Surprisingly, though some of these scores have been used for decades, we found errors in 5 score specifications: 8 coverage violations and 3 non-overlap violations. Second, we design and implement an automatic, dynamic analysis-based approach for verifying score correctness in a given Android app; the approach combines efficient, automatic GUI extraction and app exploration with partition/consistency checking to expose app errors. We applied the approach to 90 Android apps that implement medical score calculators. We found 23 coverage violations in 11 apps; 32 non-overlap violations in 12 apps, and 16 incorrect score calculations in 16 apps. We reported all findings to developers, which so far has led to fixes in 6 apps.
移动医疗评分计算器应用程序在从业人员中广泛使用,以帮助制定有关患者治疗和诊断的决策。分数定义、输入或计算中的错误可能导致严重甚至可能危及生命的情况。尽管赌注很高,但目前还没有系统或严格的措施来审查和验证分数计算器应用程序。我们通过一种新颖的、基于间隔的分数检查方法来解决这些问题。根据我们的观察,医学参考表本身可能包含错误(可以传播到应用程序),我们首先引入了参考表的自动正确性检查。具体来说,我们将分数正确性检查简化为分数参数范围内的分区检查(覆盖和不重叠)。我们检查了12个用于急诊、重症监护和急症护理的评分系统。令人惊讶的是,尽管这些分数中的一些已经使用了几十年,但我们在5个分数规范中发现了错误:8个覆盖违规和3个非重叠违规。其次,我们设计并实现了一种基于自动动态分析的方法来验证给定Android应用程序的分数正确性;该方法结合了高效、自动的GUI提取和应用程序探索以及分区/一致性检查来暴露应用程序错误。我们将这种方法应用于90个实现医疗分数计算器的Android应用程序。我们在11款应用中发现了23个报道违规行为;12个应用出现32次不重叠违规,16个应用出现16次不正确的分数计算。我们向开发者报告了所有发现,到目前为止已经修复了6个应用程序。
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引用次数: 0
Echo 回声
Q2 COMPUTER SCIENCE, INFORMATION SYSTEMS Pub Date : 2023-09-27 DOI: 10.1145/3610874
Meng Xue, Kuang Peng, Xueluan Gong, Qian Zhang, Yanjiao Chen, Routing Li
Intelligent audio systems are ubiquitous in our lives, such as speech command recognition and speaker recognition. However, it is shown that deep learning-based intelligent audio systems are vulnerable to adversarial attacks. In this paper, we propose a physical adversarial attack that exploits reverberation, a natural indoor acoustic effect, to realize imperceptible, fast, and targeted black-box attacks. Unlike existing attacks that constrain the magnitude of adversarial perturbations within a fixed radius, we generate reverberation-alike perturbations that blend naturally with the original voice sample 1. Additionally, we can generate more robust adversarial examples even under over-the-air propagation by considering distortions in the physical environment. Extensive experiments are conducted using two popular intelligent audio systems in various situations, such as different room sizes, distance, and ambient noises. The results show that Echo can invade into intelligent audio systems in both digital and physical over-the-air environment.
智能音频系统在我们的生活中无处不在,例如语音命令识别和说话人识别。然而,研究表明,基于深度学习的智能音频系统容易受到对抗性攻击。在本文中,我们提出了一种物理对抗性攻击,利用混响,一种自然的室内声学效应,实现难以察觉的,快速的,有针对性的黑盒攻击。与现有的将对抗性扰动的大小限制在固定半径内的攻击不同,我们产生了与原始语音样本自然混合的类似混响的扰动1。此外,通过考虑物理环境中的扭曲,我们甚至可以在空中传播下生成更健壮的对抗性示例。使用两种流行的智能音频系统在不同的情况下进行了广泛的实验,例如不同的房间大小,距离和环境噪声。结果表明,无论在数字环境还是物理无线环境下,Echo都可以入侵智能音频系统。
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引用次数: 0
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