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2015 9th International Conference on Sensing Technology (ICST)最新文献

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Time synchronization using distributed observer algorithm with sliding mode control element in wireless sensor networks 无线传感器网络中基于滑模控制的分布式观测器时间同步算法
Pub Date : 2015-12-01 DOI: 10.1109/ICSENST.2015.7438374
Yew Tze Hui, M. Mahyuddin
This paper describes a novel distributed observer algorithm which uses augmented sliding mode control element for time synchronisation purpose in a wireless sensor networks (WSN). Time synchronisation is a prevalent and an important issue in the field of WSN. Local clocks on each nodes within any interconnected WSN should have exchanged messages with a common time reference. Referencing to a distinct (unsynchronised) value of virtual global reference clock will render the nodes communication and application in WSN useless. The algorithm proposed in this paper known as Time Synchronization using Distributed Observer algorithm with Sliding mode control element (TSDOS) features a useful switching action, common in control research, which provides a salient feature in guaranteeing finite-time convergence in synchronised virtual time clock estimation error. The main purpose is to achieve global clock synchronization with faster convergence speed and reduced synchronization error. TSDOS has the characteristics of being totally distributed, asynchronous, scalable across different network topological structures and robust to adhoc nodes deployment and link failures. Communication link node deployment and link failure scenario are simulated comprising of 9 WSN nodes. The adoption of TSDOS shows that the faster convergence in time synchronization has been successfully achieved in comparison to the conventional distributed scheme.
本文描述了一种新的分布式观测器算法,该算法在无线传感器网络中采用增广滑模控制单元实现时间同步。时间同步是无线传感器网络领域的一个重要课题。在任何相互连接的WSN中,每个节点上的本地时钟都应该使用公共时间参考交换消息。引用一个不同的(不同步的)虚拟全局参考时钟值将使节点在WSN中的通信和应用失效。本文提出的算法称为使用滑模控制元件的分布式观测器时间同步算法(TSDOS),该算法具有控制研究中常见的有用的切换动作,它提供了保证同步虚拟时钟估计误差的有限时间收敛的显著特征。主要目的是实现全局时钟同步,加快收敛速度,减少同步误差。tdos具有完全分布式、异步、跨不同网络拓扑结构的可扩展性和对自组织节点部署和链路故障的鲁棒性等特点。模拟了由9个WSN节点组成的通信链路节点部署和链路故障场景。采用TSDOS的结果表明,与传统的分布式方案相比,TSDOS在时间同步方面的收敛速度更快。
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引用次数: 3
A sensor platform for the visually impaired to walk straight avoiding obstacles 为视障人士提供的一种传感器平台,帮助他们避开障碍物直走
Pub Date : 2015-12-01 DOI: 10.1109/ICSENST.2015.7438513
S. Silva, D. Dias
We present a sensor platform to be mounted on the white cane used by the visually impaired. This can estimate the direction of user movement and enable the user to detect obstacles lying on the path in advance. The sensor platform contains an ultrasonic sensor and an IMU (Inertia Measurement Unit). We develop a model to estimate distances to obstacles in the path and their width based on sensor measurements. The model is demonstrated to have an overall accuracy of 84%, with accuracy as high as 90% for obstacles within 50cm in front of the user. Knowledge of obstacle locations and their size in advance, would enable us to guide visually impaired persons to deviate from their path and return to it after the obstacle has been passed.
我们设计了一个传感器平台,安装在视障人士使用的白色手杖上。这可以估计用户的运动方向,并使用户能够提前检测到路径上的障碍物。传感器平台包含一个超声波传感器和一个惯性测量单元。我们开发了一个基于传感器测量的模型来估计路径中障碍物的距离和它们的宽度。该模型的总体准确率为84%,对于用户前方50厘米范围内的障碍物,准确率高达90%。提前知道障碍物的位置和大小,可以帮助我们引导视障人士离开他们的路径,并在障碍物通过后返回。
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引用次数: 9
A bioimpedance-based microflow cytometer with compact electronic instrumentation for counting of microparticles 一种基于生物阻抗的微流式细胞仪,带有用于计数微粒的紧凑电子仪器
Pub Date : 2015-12-01 DOI: 10.1109/ICSENST.2015.7438383
Soumen Das, D. Das, Sudipto Maiti, K. Biswas
Cell counting in microfluidic platform finds many interesting applications in healthcare and medical technology. In microflow cytometers, cells are counted based on either optical or electrical properties. In this paper, a bioimpedance based microflow cytometer has been fabricated to detect and count the microparticles flowing through a microchannel. The numerical simulation suggests that the proposed device is capable to detect microparticles having different sizes and properties. Initially, the signal produced from cytometer are collected by data accusation system demonstrating generation of voltage pulse corresponding to each particle. Additionally, an instrumentation system has been developed to detect and count those pulses in real-time and display on a screen.
微流控平台的细胞计数在医疗保健和医疗技术中有许多有趣的应用。在微流式细胞仪中,细胞计数是基于光学或电学性质。本文制作了一种基于生物阻抗的微流式细胞仪,用于检测和计数通过微通道的微颗粒。数值模拟表明,该装置能够检测具有不同大小和性质的微粒。首先,由数据采集系统采集细胞仪产生的信号,显示每个粒子对应的电压脉冲的产生。此外,还开发了一种仪器系统,可以实时检测和计数这些脉冲,并在屏幕上显示。
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引用次数: 0
A wireless reference node to provide self-calibration capability to wireless sensors networks 为无线传感器网络提供自校准能力的无线参考节点
Pub Date : 2015-12-01 DOI: 10.1109/ICSENST.2015.7438418
D. Smorgon, V. Fernicola
Wireless sensors networks (WSNs) are constantly expanding their application field, from simple two-state measurements (e.g., on/off, proximity detection, etc.) to distributed many-parameter measurements. Commercial WSNs offer a wide range of functions and performance with sensors sometimes achieving accuracy comparable with desktop instrumentation. However, the advantage of using such sensors for in-situ monitoring is often offset by the need of partially dismantling the network at the time of periodic network nodes calibration. As a result, new reference standards suitable for automatic and in-situ calibration of such sensors networks are needed in order to reduce the calibration cost, the inherent inefficiency and the logistic problems of a laboratory calibration, further exploiting the communication capabilities of a WSN. This work discusses the development of a wireless reference node (WRN) for the measuring of environment quantity such as air temperature (T) and relative humidity (RH). The module was developed for accurate measurements of additional environment-related quantities whose principle is based on a capacitive sensing mechanism (e.g. pressure, air-flow, moisture, etc...). The WRN performance was investigated in the temperature range from 0 °C to 40 °C and in the relative humidity range from 10 %rh to about 90 %rh for its potential use as a transfer standard for automatic in-situ calibrations. Some of novelties here reported were patented and are now available to upgrade a basic WSN with an automatic in-situ calibration capability.
无线传感器网络(WSNs)的应用领域正在不断扩大,从简单的双态测量(如开/关、接近检测等)到分布式多参数测量。商用无线传感器网络提供广泛的功能和性能,传感器有时可以达到与台式仪器相当的精度。然而,使用这种传感器进行现场监测的优势往往被需要在周期性网络节点校准时部分拆除网络所抵消。因此,为了降低校准成本、降低实验室校准固有的低效率和后勤问题,进一步开发WSN的通信能力,需要新的适用于此类传感器网络的自动和原位校准的参考标准。这项工作讨论了无线参考节点(WRN)的发展,用于测量环境量,如空气温度(T)和相对湿度(RH)。该模块是为精确测量额外的环境相关量而开发的,其原理基于电容传感机制(例如压力,空气流量,湿度等)。在0°C至40°C的温度范围和10% rh至约90% rh的相对湿度范围内,研究了WRN的性能,以便将其用作自动原位校准的传递标准。本文报道的一些新技术已获得专利,现在可用于升级具有自动原位校准功能的基本WSN。
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引用次数: 1
Medical WSN: Defense for selective forwarding attack 医用无线传感器网络:选择性转发攻击防御
Pub Date : 2015-12-01 DOI: 10.1109/ICSENST.2015.7438364
Avijit Mathur, T. Newe
The requirements of a Medical Wireless Sensor Networks (MWSN) may vary compared to other networks. The variations could be at different levels i.e. network level, clustering level or security level. This paper looks at the necessary requirements, with particular focus on clustering and routing. It includes an implementation of a MWSN in Contiki operating system using Tmote Sky and openmote technologies. This implementation incorporates a mechanism for the election of a cluster head, and the case of a modified secure routing algorithm. The results are provided with simulation-based, and real world measurements. The paper presents single and collaborative selective forwarding detection and correction with an accuracy check. Additionally, a solution to the problem of malicious nodes dropping control messages has been provided. The uniqueness of the paper resides in the system's capability in detecting and correcting both single and collaborative selective forwarding attacks with 93% and 86% accuracy respectively.
与其他网络相比,医疗无线传感器网络(MWSN)的要求可能有所不同。这些变化可能在不同的级别,例如网络级别、集群级别或安全级别。本文着眼于必要的需求,特别关注集群和路由。它包括在Contiki操作系统中使用Tmote Sky和openmote技术实现MWSN。该实现结合了一种选举簇头的机制,以及一种改进的安全路由算法。结果提供了基于模拟和现实世界的测量。本文提出了单个和协作的选择性转发检测和校正,并进行了准确性检查。此外,还针对恶意节点丢弃控制消息的问题提供了解决方案。本文的独特之处在于系统检测和纠正单个和协作选择性转发攻击的能力,准确率分别为93%和86%。
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引用次数: 5
Electrical Capacitance Tomography with a variable topology 可变拓扑的电容层析成像
Pub Date : 2015-12-01 DOI: 10.1109/ICSENST.2015.7438462
Stephan Mühlbacher-Karrer, H. Zangl
In this paper we present a novel approach for Electrical Capacitance Tomography (ECT) with a variable electrode topology of the sensor front end. The topology of the ECT can be continuously varied while the reconstruction takes place. The unique combination of light weight signal processing chain with a variable dual plate planar sensor front end meets the usability and performance requirements of robotic and mobile applications. The experimental results show the feasibility of this approach achieving reconstruction results with low artefacts even with a low number of electrodes not only in the vicinity of the electrodes but also in the center of the Region of Interest (ROI). Moreover, this sensor topology can be miniaturized which eases the integration, e.g., on a robot's end effector.
在本文中,我们提出了一种新的电容层析成像(ECT)方法,该方法具有可变电极拓扑的传感器前端。当重建发生时,电痉挛的拓扑结构可以连续变化。轻量化信号处理链与可变双板平面传感器前端的独特组合满足机器人和移动应用的可用性和性能要求。实验结果表明,该方法不仅在电极附近,而且在感兴趣区域(ROI)的中心,即使电极数量少,也能获得低伪影的重建结果。此外,这种传感器拓扑结构可以小型化,从而简化了集成,例如在机器人的末端执行器上。
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引用次数: 3
Routing protocols for small scale WLAN based Wireless Sensor Networks (WSNs) 基于WLAN的小规模无线传感器网络(wsn)路由协议
Pub Date : 2015-12-01 DOI: 10.1109/ICSENST.2015.7438432
Noman Shabbir, R. Nawaz, M. N. Iqbal, Juniad Zafar
This paper focuses on the comparative analysis of routing protocols such as Ad-hoc On-demand Distance Vector Routing System (AODV), Dynamic Source Routing (DSR) and Optimized Link State Routing (OLSR). The analysis is been made against different network parameters like network load, end to end delay and throughput in a small scale Wireless Local Area (WLAN) based Wireless Sensor Network (WSN) scenarios to identify the best performing protocol. Simulation results indicate that OLSR gives minimum network load while AODV gives best throughput and in terms of delay, OLSR is more efficient.
本文重点对Ad-hoc按需距离矢量路由系统(AODV)、动态源路由(DSR)和优化链路状态路由(OLSR)等路由协议进行了比较分析。在基于小型无线局域网(WLAN)的无线传感器网络(WSN)场景中,针对不同的网络参数(如网络负载、端到端延迟和吞吐量)进行了分析,以确定性能最佳的协议。仿真结果表明,网络负载最小的是OLSR,而网络吞吐量最好的是AODV,在时延方面,OLSR效率更高。
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引用次数: 2
High sensitivity extrinsic Fabry-Pèrot interferometer for humidity sensing 用于湿度传感的高灵敏度外部法布里-珀特干涉仪
Pub Date : 2015-12-01 DOI: 10.1109/ICSENST.2015.7438380
J. Ascorbe, C. Sanz, J. Corres, F. Arregui, I. Matías, S. Mukhopadhyay
In this work we present a high sensitivity optical fiber humidity sensor. The configuration chosen for this purpose is a Fabry-Pérot interferometer. The device has been fabricated by means of sputtering. A semiconductor material was used to build the nano-cavity which produces the interferometry. Then the device was introduced into a climatic chamber in order to change relative humidity. Changes of 88 nm have been obtained for relative humidity varying from 20% to 90%, which implies a sensitivity of 1.27 nm/%RH.
本文介绍了一种高灵敏度光纤湿度传感器。为此目的选择的配置是一个法布里-普氏干涉仪。该装置是用溅射法制造的。采用半导体材料构建产生干涉测量的纳米腔。然后将该装置引入气候室,以改变相对湿度。在相对湿度从20%到90%的范围内,获得了88 nm的变化,这意味着灵敏度为1.27 nm/%RH。
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引用次数: 5
Early detection of neurological disease using a smartphone: A case study 使用智能手机早期检测神经系统疾病:一个案例研究
Pub Date : 2015-12-01 DOI: 10.1109/ICSENST.2015.7438443
Kun-Chan Lan, Wen-Yuah Shih
Diagnosing Parkinson's disease (PD) is often difficult, especially in its early stages. It has been estimated that nearly 40% of people with the disease may not be diagnosed. Traditionally, the diagnosis of Parkinson's disease often requires a doctor to observe the patient over time to recognize signs of rigidity. In this work, we propose a PDR-based method to continuously monitor and record the patient's gait characteristics using a smart-phone. Our tool could be useful in providing an early warning to the PD patient to seek medical assistance and help the doctor diagnose the disease earlier.
诊断帕金森病(PD)通常是困难的,特别是在其早期阶段。据估计,近40%的患者可能没有被诊断出来。传统上,帕金森病的诊断通常需要医生长时间观察患者,以识别僵硬的迹象。在这项工作中,我们提出了一种基于pdr的方法,使用智能手机连续监测和记录患者的步态特征。我们的工具可以为PD患者提供早期预警,帮助他们寻求医疗援助,并帮助医生更早地诊断疾病。
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引用次数: 5
Improvement of signal-to-noise-ratio by combining Walsh and Golay codes in modulating the pump light of phase-shift pulse BOTDA fiber sensor 结合Walsh码和Golay码调制相移脉冲BOTDA光纤传感器泵浦光提高信噪比
Pub Date : 2015-12-01 DOI: 10.1109/ICSENST.2015.7438405
M. Zan, A. Bakar, T. Horiguchi
We report in this paper the simultaneous employment of two different coding techniques called Walsh code and Golay code for modulating the pump light of Brillouin optical time domain analysis (BOTDA) fiber optic sensor. In this technique, the elements of Walsh code are nested within each element of Golay code and vice versa. The technique also modulates the pump with the non-return-to-zero (NRZ) and return-to-zero (RZ) formats for the inner and outer codes, respectively. Experimental findings have revealed that the proposed coding technique contributed to higher signal-to-noise improvement ratio (SNIR), compared to that of using only one kind of code; we obtained the maximum optical SNIR of about 6 dB. We have also successfully demonstrated 10 cm of high spatial resolution measurement with the use of 1 ns of coded pulse duration.
本文报道了同时采用Walsh码和Golay码两种不同的编码技术调制布里频光时域分析(BOTDA)光纤传感器的泵浦光。在这种技术中,Walsh代码的元素嵌套在Golay代码的每个元素中,反之亦然。该技术还分别用不归零(NRZ)和归零(RZ)格式调制泵的内部和外部代码。实验结果表明,与仅使用一种编码相比,该编码技术具有更高的信噪比(SNIR);我们获得了最大的光学信噪比约为6 dB。我们还成功演示了使用1ns编码脉冲持续时间进行10cm高空间分辨率测量。
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引用次数: 4
期刊
2015 9th International Conference on Sensing Technology (ICST)
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