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检索条件"任意字段=Proceedings of the 21st ACM Conference on Embedded Networked Sensor Systems"

共 105 条记录，以下是61-70 订阅

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Facial Expression Recognition in Daily Life by embedded Photo Reflective sensors on Smart Eyewear 16

Facial Expression Recognition in Daily Life by Embedded Phot...

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21st International conference on Intelligent User Interfaces (IUI)

作者： Masai, Katsutoshi Sugiura, Yuta Ogata, Masa Kunze, Kai Inami, Masahiko Sugimoto, Maid Keio Univ Yokohama Kanagawa Japan AIST Koto Ku Tokyo Japan Univ Tokyo Bunkyo Ku Tokyo Japan

ISBN: (纸本)9781450341370

This paper presents a novel smart eyewear that uses embedded photo reflective sensors and machine learning to recognize a wearer's facial expressions in daily life. We leverage the skin deformation when wearers change their facial expressions. With small photo reflective sensors, we measure the proximity between the skin surface on a face and the eyewear frame where 17 sensors are integrated. A Support Vector Machine (SVM) algorithm was applied for the sensor information. The sensors can cover various facial muscle movements and can be integrated into everyday glasses. The main contributions of our work are as follows. (1) The eyewear recognizes eight facial expressions (92.8% accuracy for one time use and 78.1% for use on 3 different days). (2) It is designed and implemented considering social acceptability. The device looks like normal eyewear, so users can wear it anytime, anywhere. (3) Initial field trials in daily life were undertaken. Our work is one of the first attempts to recognize and evaluate a variety of facial expressions in the form of an unobtrusive wearable device.

关键词： Wearable Smart Eye Glasses Eyewear Computing Facial Expression Recognition

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Poster: Rethinking embedded sensor Data Processing and Analysis with Large Language Models 23

Poster: Rethinking Embedded Sensor Data Processing and Analy...

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21st Annual International conference on Mobile systems, Applications and Services, MobiSys 2023

作者： Sooriya Patabandige, Pramuka Medaranga Waskito, steven Antya Orvala Li, Kunjun Leow, Kai Jie Chakrabarty, Shantanu Varshney, Ambuj National University of Singapore Singapore NCS Group Singapore

ISBN: (纸本)9798400701108

An important step in the deployment of wireless embedded systems is the analysis of the sensor data. Traditionally, this requires machine learning models tailored to the application use case. However, this step requires significant expertise from the end user and can be less adaptable to the dynamics of real-world deployments. In recent years, large language models have seen significant developments. These models have been shown to be capable of performing general-purpose tasks. In this work, we explore the hypothesis that large language models can be used to aid in sensor data analysis. Our preliminary findings through real-world experiments show significant promise for two tasks: inferring hand gestures through tracking of light and vibration sensor data. We believe these findings highlight the potential of large language models in sensor data analysis, and thus, it warrants further study. © 2023 Owner/Author(s).

关键词： Data handling

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Wakeup signal length optimization combined with payload aggregation and FEC in WSNs 21

Wakeup signal length optimization combined with payload aggr...

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21st European Wireless conference, European Wireless 2015

作者： Milánkovich, Ákos Ill, Gergely Lendvai, Károly Imre, Sándor Szabó, Sándor Department of Networked Systems and Services Budapest University of Technology and Economics Budapest Hungary

ISBN: (纸本)9783800739769

Energy efficiency in wireless sensor networks became a key question. There are various methods to achieve longer battery life in small devices. We consider delay-tolerant wireless sensor networks with battery-operated nodes and use data-aggregation to cut the size of packet overhead caused by headers. In this paper a formula is presented to determine the optimal wakeup signal length, which minimizes the energy consumed for waking up nodes in sleep mode via a special radio signal. The demonstrated calculations and graphs are based on the investigation of an existing system. The contribution of this paper is a general method to improve the energy efficiency of wireless sensor networks by using the optimal length of the wakeup signal in case of different amounts of payload aggregation and Forward Error Correction methods. The presented results can be accommodated to arbitrary packet-based wireless protocols. © VDE Verlag GMBH, Berlin, Offenbach, Germany.

关键词： Energy efficiency

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Highly-sensitive optical fiber oxygen sensor based on dye entrapped core-shell silica nanoparticles

Highly-sensitive optical fiber oxygen sensor based on dye en...

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21st International conference on Optical Fiber sensors

作者： Chu, Chen-Shane Lo, Yu-Lung Sung, Ti-Wen Ming Chi Univ Technol Dept Mech Engn Taishan Taipei County Taiwan Natl Cheng Kung Univ Dept Engn Mech Tainan Taiwan

ISBN: (纸本)9780819482464

This paper presents a highly-sensitive oxygen sensor that comprises an optical fiber coated at one end with platinum (II) meso-tetrakis (pentrafluorophenyl)porphine (PtTFPP) and PtTFPP entrapped core-shell silica nanaparticles embedded in an n-octyltriethoxysilane (Octyl-triEOS)/tetraethylorthosilane (TEOS) composite xerogel. The sensitivity of the optical oxygen sensor is quantified in terms of the ratio I-0/I-100, where I-0 and I-100 represent the detected fluorescence intensities in pure nitrogen and pure oxygen environments, respectively. The experimental results reveal that the oxygen sensor has a sensitivity of 166. The response time was 1.3 s when switching from pure nitrogen to pure oxygen, and 18.6 s when switching in the reverse direction.

关键词： Optical fiber oxygen sensor Pt(II) complex Core-shell Sol-gel process

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state Feedback stabilization for Switched Singular networked Control systems with Time-delay

State Feedback Stabilization for Switched Singular Networked...

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21st Chinese Control and Decision conference

作者： Du Zhaoping Zhang Qingling Chang Guisong Jiangsu Univ Sci & Technol Sch Elect & Informat Zhenjiang 212003 Peoples R China Northeastern Univ Inst Syst Sci Shenyang 110004 Peoples R China Northeastern Univ Dept Math Shenyang 110004 Peoples R China

ISBN: (纸本)9781424427239

In this paper, the problem of state feedback stabilization for switched singular networked control systems with time-delay is considered. Firstly, the modeling problem is discussed. Suppose the sensor node is time-driven, the controller and executor are event-driven, assuming the sensor data are transmitted with single data packed and the transfer delay is less than one sampled period, the system can be modeled as an linear discrete switched system with delay. By Lyapunov function, we can easily determine the stability of the systems. Using Matlab LMI toolbox, we can obtain the state feedback control law at the same time. Finally, an example is presented to illustrate that the proposed method is efficient.

关键词： switched system singular networked control systems linear matrix inequality (LMI) stabilization

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Mitigating congestion in wireless sensor networks 04

Mitigating congestion in wireless sensor networks

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2nd International conference on embedded networked sensor systems, SenSys'04

作者： Hull, Bret Jamieson, Kyle Balakrishnan, Hari MIT Computer Science and Artificial Intelligence Laboratory Stata Center 32 Vassar St. Cambridge MA 02139 United States

ISBN: (纸本)1581138792

Network congestion occurs when offered traffic load exceeds available capacity at any point in a network. In wireless sensor networks, congestion causes overall channel quality to degrade and loss rates to rise, leads to buffer drops and increased delays (as in wired networks), and tends to be grossly unfair toward nodes whose data has to traverse a larger number of radio hops. Congestion control in wired networks is usually done using end-to-end and network-layer mechanisms acting in concert. However, this approach does not solve the problem in wireless networks because concurrent radio transmissions on different "links" interact with and affect each other, and because radio channel quality shows high variability over multiple time-scales. We examine three techniques that span different layers of the traditional protocol stack: hop-by-hop flow control, rate limiting source traffic when transit traffic is present, and a prioritized medium access control (MAC) protocol. We implement these techniques and present experimental results from a 55-node in-building wireless sensor network. We demonstrate that the combination of these techniques, Fusion, can improve network efficiency by a factor of three under realistic workloads. © 2004 acm.

关键词： Flow control

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Design and implementation of a framework for efficient and programmable sensor networks 03

Design and implementation of a framework for efficient and p...

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1st International conference on Mobile systems, Applications and Services

作者： Boulis, A Han, CC Srivastava, MB Univ Calif Los Angeles EE Dept NESL Los Angeles CA 90024 USA

ISBN: (纸本)1931971099

Wireless ad hoe sensor networks have emerged as one of the key growth areas for wireless networking and computing technologies. So far these networks/systems have been designed with static and custom architectures for specific tasks, thus providing inflexible operation and interaction capabilities. Our vision is to create sensor networks that are open to multiple transient users with dynamic needs. Working towards this vision, we propose a framework to define and support lightweight and mobile control scripts that allow the computation, communication, and sensing resources at the sensor nodes to be efficiently harnessed in an application-specific fashion. The replication/migration of such scripts in several sensor nodes allows the dynamic deployment of distributed algorithms into the network. Our framework, sensorWare, defines, creates, dynamically deploys, and supports such scripts. Our implementation of sensorWare occupies less than 180Kbytes of code memory and thus easily fits into several sensor node platforms. Extensive delay measurements on our iPAQ-based prototype sensor node platform reveal the small overhead of sensorWare to the algorithms (less than 0.3msec in most high-level operations). In return the programmer of the sensor network receives compactness of code, abstraction services for all of the node's modules, and in-built multi-user support. sensorWare with its features apart from making dynamic programming possible it also makes it easy and efficient without restricting the expressiveness of the algorithms.*

关键词： sensor nodes

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Demo: Exploring Autoregressive Integrated Models for Time Synchronization in Wireless sensor Networks Extended Abstract 15

Demo: Exploring Autoregressive Integrated Models for Time Sy...

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21st Annual International conference on Mobile Computing and Networking (MobiCom)

作者： Masood, Wasif Schmidt, Jorge F. Univ Klagenfurt Inst Networked & Embedded Syst Klagenfurt Austria

ISBN: (纸本)9781450336192

Time synchronization provides the basis for several applications in wireless sensor networks but the limited memory and computational power, and the use of low precision oscillators make the task of time synchronization non-trivial. In this demonstration, we present a novel time synchronization scheme that is based on time series analysis. To provide a general model for the practical behavior of low precision oscillators, autoregressive integrated moving average models are explored. Based on the analysis of experimental data, an autoregressive integrated model (ARI (1,1)) is derived. Unlike the resource hungry Kalman filter based formulations, the proposed scheme is resource efficient as it results in simple linear regression processing. Experiments are performed on real sensor devices including Zolertia and TelosB, where an accuracy below 1 clock tick(1) is achieved.

关键词： synchronization arima IEEE 802.15.4 wireless sensor networks

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Crowdsourcing based Mobile Location Recognition with Richer Fingerprints from Smartphone sensors 21

Crowdsourcing based Mobile Location Recognition with Richer ...

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21st IEEE International conference on Parallel and Distributed systems ICPADS

作者： Wang, Hao Zhao, Dong Ma, Huadong Xu, Huaiyu Hou, Xiabing Beijing Univ Posts & Telecommun Beijing Key Lab Intelligent Telecommun Software & Sch Comp Sci Beijing Peoples R China

ISBN: (纸本)9780769557854

With the rapid advancements of mobile computing, mobile location recognition is becoming an important and useful service, which recognizes the logical locations of places/scenes that users are interested in, instead of physical coordinates. Most of the existing mobile location recognition systems utilize the image as visual fingerprint of a place, and need to construct a large-scale visual fingerprint database in advance. However, collecting visual fingerprints is a labor-intensive and time-consuming procedure. In order to address this problem, we propose a novel crowdsourcing-based framework, and leverage a variety of sensors embedded in smartphones to collect richer location fingerprints for exploring their positive effects. To achieve higher recognition accuracy, we propose an object-centric fingerprint searching which can sufficiently take advantage of smartphone sensors and determine more accurate searching space than the traditional user-centric method. We build a crowdsourcing-based database with richer fingerprints and implement a location recognition system, called CrowdLR. Extensive experiments verify that our object-centric method can achieve promising results maintaining around 10% precision higher than the user-centric method.

关键词： Mobile Location Recognition Crowdsourcing Fingerprint Smartphone sensor Object-centric

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A computationally efficient decimation filter design for embedded systems

A computationally efficient decimation filter design for emb...

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proceedings of the 21st IEEE Instrumentation and Measurement Technology conference, IMTC/04

作者： Yeary, M. Zhang, W. Trelewicz, J.Q. DSP and Embedded Systems Laboratory Department of Electronic Engineering University of Oklahoma 202 W. Boyd Norman OK 73019 IBM Almaden Research Center 650 Harry Road San Jose CA 95120

As analog-to-digital converters become faster, this will allow them to become closer to their intended sensor. This will foster an environment that will continue to allow a paradigm shift in which digital systems replace analog ones, thus mitigating many non-ideal effects. In parallel with this trend, the importance of decimation filters will continue to expand - as the high speed data will need to be down-sampled prior to a decision making element, such as a digital signal processor (running CFAR algorithms, neural networks [1], and the like). Ideally, these decimation filters should have as much stop-band attenuation as possible. However, on a fixed point processor, like an FPGA, the finite word-length effects are in opposition to this goal. To break this nexus, this paper employs an integerization technique and explores how these integerized implementations improve performance in embedded systems. This technology creates fixed integer transforms with computationally optimal representations.

关键词： embedded systems

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