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International journal of sensor networks and data communications最新文献

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Design of a Selective Filter-Antenna with Low Insertion Loss and High Suppression Stopband for WiMAX Applications 用于WiMAX应用的低插入损耗高抑制阻带选择性滤波天线的设计
Pub Date : 2016-09-23 DOI: 10.4172/2090-4886.1000147
Alkhafaji Mk, Sahbudin Rkz, Ismail Ab, Hashim Sj
This paper presents a selective quasi–elliptic bandpass filter-antenna. The presented filter-antenna has a low insertion loss in the passband and relatively high stopband rejection. This structure consists of a quasi–elliptic bandpass filter direct coupled with patch antenna. The bandpass filter consists of four (λ/4) spiral square resonators. It has operates between (3.25–3.6) GHz so it is suitable for WiMAX applications. A CST Microwave Studio Suite software has used to simulate the filter-antenna circuit. The simulated results of the patch antenna and the results of the filter-antenna appears a good matching between the two circuits.
提出了一种选择性准椭圆带通滤波器天线。所提出的滤波器天线具有低的通带插入损耗和较高的阻带抑制。该结构由准椭圆带通滤波器与贴片天线直接耦合组成。带通滤波器由四个(λ/4)螺旋方形谐振器组成。它在(3.25-3.6)GHz之间工作,因此适用于WiMAX应用。利用CST Microwave Studio Suite软件对滤波器天线电路进行了仿真。贴片天线的仿真结果与滤波天线的仿真结果吻合较好。
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引用次数: 3
Degrading the Effect of Channel Impairment on STBC-OFDM System in Rayleigh Fading Channel 瑞利衰落信道中信道损伤对STBC-OFDM系统的影响
Pub Date : 2016-08-30 DOI: 10.4172/2090-4886.1000146
Hemlata Sinha, M. Meshram, G. R. Sinha
This paper indicates the space time block code provides transmit diversity in wireless fading channel during the STBC-OFDM system. OFDM is enforced in broadband wireless access systems as the way to beat wireless channel impairments and to enhance and breadth potency. This research is to analyze the performance of non STBC-OFDM system and STBC-OFDM system. The performance has been evaluated for construction modulation (QAM) technique for orthogonal frequency division multiplexing (OFDM) systems using multiple transmit diversity antenna system in the channel. Conjointly the equation of SNR and BER has been derived for 16-QAM for multiple transmit and receive antenna for STBC-OFDM system by considering the have an effect on of Inter-symbol interference (ISI), phase noise and temporal arrangement noise in Raleigh fading channel.
在STBC-OFDM系统中,空时分组码提供了无线衰落信道中的发射分集。在宽带无线接入系统中,OFDM是一种克服无线信道缺陷和增强信道宽度潜能的方法。本研究分析了非STBC-OFDM系统和STBC-OFDM系统的性能。对正交频分复用(OFDM)系统中采用多发射分集天线系统的构造调制(QAM)技术的性能进行了评价。考虑罗利衰落信道中码间干扰(ISI)、相位噪声和时序噪声的影响,推导了STBC-OFDM系统中16-QAM多收发天线的信噪比和误码率方程。
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引用次数: 0
Remote Patient Monitoring System Based Coap in Wireless SensorNetworks 基于无线传感器网络的远程病人监护系统
Pub Date : 2016-08-12 DOI: 10.4172/2090-4886.1000145
Pandesswaran C, Surender S, Karthik Kv
Patient monitoring is a process of collecting medical parameters of a patient present at a remote location. To deal with this particular issue in a hospital or medical assistance centre, this paper proposes an alternative vision that includes support through internet based on wireless networks and also compatible with existing infrastructure. Most of the existing paper deals with monitoring through sophisticated hardware in a private network and each have its own overheads of switching to a new system model. This paper deals with the enhanced Constrained Application Protocol (CoAP) using multi hop flat topology, which makes the patients being monitored by a central system. It also provides secure communication among the patient nodes by using the public key algorithm. We aim to minimize as well improve implementation method more domestically and secure communication between client and server.
患者监测是收集远程位置患者的医疗参数的过程。为了解决医院或医疗援助中心的这一特殊问题,本文提出了另一种愿景,即通过基于无线网络的互联网提供支持,并与现有基础设施兼容。现有的大多数论文都是通过专用网络中的复杂硬件进行监控的,并且每个都有自己切换到新系统模型的开销。本文研究了一种基于多跳平面拓扑结构的增强约束应用协议(CoAP),该协议使患者处于一个中心系统的监控之下。它还通过使用公钥算法提供了患者节点之间的安全通信。我们的目标是尽量减少并改进实现方法,使客户端和服务器之间的通信更加安全。
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引用次数: 5
Data Analysis of Precipitation Hardening of Al-Cu Alloy through Fuzzy Monitoring Approach 基于模糊监测的Al-Cu合金析出硬化数据分析
Pub Date : 2016-08-11 DOI: 10.4172/2090-4886.1000E109
H. Vafaeenezhad, M. Ghomaishi
It is often necessary to perform a heat treatment that aluminum alloys can be used for modern advanced applications. That is to say that the most pertinent and effective way to improve the mechanical properties of Al alloys is precipitation hardening. Precipitation hardening of Al alloys requires high quench rate after solution annealing to avoid coarse intermetallic precipitates formation at the grain boundaries. A supersaturated solid solution of alloying elements is a pre-requisite for the formation of fine intermetallic precipitates during aging, which improves the strength of the material.
通常需要进行热处理,铝合金才能用于现代先进的应用。也就是说,提高铝合金力学性能最中庸、最有效的方法是沉淀硬化。铝合金的析出硬化要求固溶退火后淬火速率高,以避免在晶界处形成粗大的金属间相。合金元素的过饱和固溶体是在时效过程中形成细小金属间相的先决条件,从而提高了材料的强度。
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引用次数: 0
A Rapid Prototyping Matlab Based Design Tool of Wireless Sensor Nodes for Healthcare Applications 基于Matlab的医疗保健应用无线传感器节点快速原型设计工具
Pub Date : 2016-07-28 DOI: 10.4172/2090-4886.1000144
R. Rammouz, L. Labrak, N. Abouchi, J. Constantin, Y. Zaatar, D. Zaouk
Remote patient monitoring enables medical facilities and personnel to monitor patients outside of conventional clinical settings. This technology is greatly affected by the available energy sources. The limited energy supply is the bottleneck for measurement, data transmission, network connection and lifetime. Thus, efficient power consumption estimation in the early stage of the design would give the user an insight on its feasibility within medical constraints. In this paper, a power-oriented Matlab based design tool is proposed. It will help the user to make an energy aware design. In fact, it will enable him to determine the power consumption of each node based on a set of selected components, the daily routine of the patient and many other factors. It will also allow him to test multiple configurations prior to the physical implementation. This will minimize the time and financial impact of any modification. Furthermore, it will provide guidance to properly adapt the design within the requirements of the application: Choosing components, energy sources, etc. A validation is proposed via a physical implementation in order to compare the results obtained through simulation with practical measurements. Future works aim to take into account memory access operations, include several sensors operating within a network, and adapt the tool to other applications (smart buildings, environmental monitoring, etc.).
远程患者监测使医疗机构和人员能够在常规临床环境之外监测患者。这项技术很大程度上受可用能源的影响。有限的能源供应是测量、数据传输、网络连接和使用寿命的瓶颈。因此,在设计的早期阶段进行有效的功耗估计将使用户了解其在医疗限制下的可行性。本文提出了一种基于Matlab的面向功率的设计工具。它将帮助用户进行节能设计。事实上,这将使他能够根据一组选定的组件、患者的日常生活和许多其他因素来确定每个节点的功耗。它还允许他在物理实现之前测试多个配置。这将最大限度地减少任何修改的时间和财务影响。此外,它将提供指导,以在应用程序的要求下适当地调整设计:选择组件,能源等。为了将仿真结果与实际测量结果进行比较,提出了通过物理实现进行验证的方法。未来的工作旨在考虑内存访问操作,包括在网络中运行的几个传感器,并使该工具适应其他应用(智能建筑,环境监测等)。
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引用次数: 4
Detection of Camouflaged People 发现伪装的人
Pub Date : 2016-07-11 DOI: 10.4172/2090-4886.1000143
Bento Na, José Silvestre Silva, D. Jb
The use of thermal imaging is a benefit for the military people. Due to their advantages, it has a large number of applications, including the detection of camouflaged people. For better results, the thermal information can be merged with the color information which allows a greater de-tail, resulting in a higher degree of security. The present work implemented as pixel level image fusion methods: Principal Components Analysis, Laplacian Pyramid, and Discrete Wavelet Transform. A qualitative analysis concluded that the method which performs better is the one that uses Wavelets, followed by the Laplacian Pyramid and finally the PCA. A quantitative analysis was made using the metrics: Standard Deviation, Entropy, Spatial Frequency, Mutual Information, Fusion Quality Index and Structural Similarity Index. The values obtained support the conclusions extracted from the qualitative analysis.
热成像的使用对军人来说是一个好处。由于它们的优点,它有大量的应用,包括检测伪装的人。为了获得更好的结果,可以将热信息与颜色信息合并,这样可以提供更多的细节,从而提高安全性。本工作采用像素级图像融合方法:主成分分析、拉普拉斯金字塔和离散小波变换。定性分析表明,采用小波分析、拉普拉斯金字塔分析和主成分分析的效果较好。采用标准偏差、熵、空间频率、互信息、融合质量指数和结构相似指数进行定量分析。所得值支持定性分析得出的结论。
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引用次数: 5
Modeling Mechanical Properties of FSW Thick Pure Copper Plates and Optimizing It Utilizing Artificial Intelligence Techniques FSW纯铜厚板力学性能建模及人工智能优化
Pub Date : 2016-05-25 DOI: 10.4172/2090-4886.1000142
A. Azizi, A. V. Barenji, R. V. Barenji, M. Hashemipour
Friction stir welding (FSW) is an innovative solid state joining technique and has been employed in aerospace, rail, automotive and marine industries for joining aluminum, magnesium, zinc and copper alloys. In this process, parameters play a major role in deciding the weld quality these parameters. Using predictive modelling for mechanical properties of FSW not only reduce experiments but also is created standard model for predict outcomes. Therefore, this paper is undertaken to develop a model to predict the microstructure and mechanical properties of FSW. The proposed model is based on Ring Probabilistic logic Neural Network (RPLNN) and optimize it utilizing Genetic Algorithms (GA). The simulation results show that performance of the RPLNN algorithm with utilizing Genetic Algorithm optimizing technique compared to real data is reliable to deal with function approximation problems, and it is capable of achieving a solution in few convergence time steps with powerful and reliable results.
搅拌摩擦焊(FSW)是一种创新的固态连接技术,已应用于航空航天、铁路、汽车和船舶工业中,用于连接铝、镁、锌和铜合金。在此过程中,参数对焊接质量起着主要的决定作用。采用预测模型对摩擦摩擦器力学性能进行预测,不仅减少了试验次数,而且为预测结果建立了标准模型。因此,本文致力于建立一个预测摩擦焊微观结构和力学性能的模型。该模型基于环概率逻辑神经网络(RPLNN),并利用遗传算法对其进行优化。仿真结果表明,与实际数据相比,采用遗传算法优化技术的RPLNN算法在处理函数逼近问题时性能可靠,能够在较短的收敛时间步内得到解,结果强大可靠。
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引用次数: 6
Micro Air Vehicles 微型飞行器
Pub Date : 2016-05-23 DOI: 10.4172/2090-4886.1000E107
Kai Li
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引用次数: 4
A Mobile Phone Controlled Electronic Immobilizer: An Application to Automobile Engineering 手机控制电子防盗器在汽车工程中的应用
Pub Date : 2016-05-17 DOI: 10.4172/2090-4886.1000141
A. Bamisaye, A. Ojo
There is a need for security to be provided for the automobiles due to the alarming rate of theft action across the globe. A system that reduce or even eliminate the menace on automobiles need to be developed. The design of automobile immobilizer using mobile phone is efficient in transmitting signal through the mobile phone that has both F (fast) and M (meter) buses network configurations to various destinations of users where communication network is available across the globe. The work was achieved with the aid of a specially designed microcontroller (PIC18F2550) that communicates directly with the mobile phone and some components like Schmitt Inverting Gate (74HC14N), Regulator LM7805 and LM317, NPN Transistor BC337, 12 Volt DC Relays and Liquid crystal display panel (LCD). It imbibed the operation of Short Message Service (SMS) and Communication is being established through a 15characters code (xxxxxxxxxxxxxxx) which is secretive and privately used by the owner to enables and disables such automobile.
由于全球范围内盗窃行为的惊人速度,需要为汽车提供安全保障。需要开发一种系统来减少甚至消除对汽车的威胁。利用手机设计的汽车防盗系统,通过具有F (fast)和M (meter)总线网络配置的手机,将信号传输到全球各地通信网络可用的用户的各个目的地,效率很高。这项工作是在一个专门设计的微控制器(PIC18F2550)的帮助下完成的,该微控制器直接与手机和一些组件通信,如施密特反相门(74HC14N),稳压器LM7805和LM317, NPN晶体管BC337, 12伏直流继电器和液晶显示面板(LCD)。它吸收了短消息服务(SMS)的操作,并通过15个字符的代码(xxxxxxxxxxxxxxx)建立通信,该代码是秘密的,由车主私下使用,以启用和禁用此类汽车。
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引用次数: 0
Real Time Fear Detection Using Wearable Single Channel Electroencephalogram 基于可穿戴单通道脑电图的实时恐惧检测
Pub Date : 2016-05-13 DOI: 10.4172/2090-4886.1000140
S. Cheemalapati, P. C. Adithya, Michael Valle, M. Gubanov, A. Pyayt
Real time detection of emotional state has multiple applications for security, safety and identification of dangerous situations. Traditionally electroencephalogram (EEG) based emotion studies are conducted in controlled lab environment with multi-channel systems and large signal processing power. In order to be useful in real world situation the system for emotion detection has to be miniature, portable and working in real time supported by calculations that can be provided by a processor power of a mobile phone. Here we present our results on real time fear detection using portable single electrode EEG system conducted on 10 subjects. We studied possibility of translation of the markers previously identified for complex multi-electrode system - ratios of slow waves to fast waves into real time portable system. It was demonstrated using Student’s t-test that the average value of the monitored parameter during normal state was significantly higher than that of during a scary stimulus with a P value of (0.027) ~ 0.03 for Theta/ Beta. The framework for portable fear detection together with the markers discussed in this study can enable many applications important for the soldiers in the battlefield or police officers while being under attack as an indicator that help is urgently needed.
情绪状态的实时检测在安保、安全和危险情况识别方面具有多种应用。传统的基于脑电图的情绪研究是在多通道系统和大信号处理能力的受控实验室环境中进行的。为了在现实世界中发挥作用,情感检测系统必须是微型的,便携的,并且可以通过移动电话的处理器提供的计算支持实时工作。本文介绍了利用便携式单电极脑电图系统对10名受试者进行实时恐惧检测的结果。我们研究了将之前在复杂多电极系统中发现的标记物——慢波与快波的比值转化为实时便携式系统的可能性。使用学生t检验证明,正常状态下监测参数的平均值显著高于恐怖刺激时的平均值,Theta/ Beta的P值为(0.027)~ 0.03。便携式恐惧检测框架以及本研究中讨论的标记可以为战场上的士兵或警察在受到攻击时提供许多重要的应用,作为迫切需要帮助的指示。
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引用次数: 3
期刊
International journal of sensor networks and data communications
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