An efficient authentication system of smart device using multi factors in mobile cloud service architecture

Mobile cloud computing environments have overcome the performance limitation of mobile devices and provide use environments not restricted by places. However, user information protection mechanisms are required because of both the security vulnerability of mobile devices and the security vulnerability of cloud computing. In this paper, a multifactor mobile device authentication system is proposed to provide safety, efficiency, and user convenience for mobile device use in cloud service architectures. This system improves security by reinforcing the user authentication required before using cloud computing services. Furthermore, to reinforce user convenience, the system proposed increases the strength of authentication keys by establishing multiple factors for authentication. For efficient entries in mobile device use environments, this system combines mobile device identification number entries, basic ID/password type authentication methods, and the authentication of diverse user bio‐information. This system also enhances authentication efficiency by processing the authentication factors of a user's authentication attempt in a lump instead of one by one in the cloud computing service environment. These authentication factors can be continuously added, and this authentication system provides authentication efficiency even when authentication factors are added. The main contribution is to improve high security level by through authentication of mobile devices with multifactors simultaneously and to use the mobile cloud service architecture for its efficient processing with respect to execution time of it. Copyright © 2013 John Wiley & Sons, Ltd.     

无线实时多播系统中混合纠删方案性能分析与评估

为了对无线实时多播系统中纠删方案的性能进行精确的分析与评估,提出基于GE(Gilbert-Elliot)信道模型与实际实验数据的精确分析与统计评估方法。提出一种分析混合纠删方案性能的闭式表达式,并设计基于WLAN的实时多播验证与评估系统,在此基础上,采用极大似然估计方法对实验数据进行统计评估。结果表明,GE模型能精确匹配实际删除错误信道,且待评估纠删方案的理论分析结果与实际测试结果基本一致,验证了该方法的精确性,提出的方法对精确分析评估各种纠删方案在无线实时多播系统中的性能具有参考和借鉴意义。     

Experimental studies of direction of arrivals using a smart antenna testbed in wireless communication systems

This paper presents some preliminary results from experimental studies on space‐division‐multiple‐access (SDMA) for wireless communications. A smart antenna system utilizing direction‐of‐arrival (DOA)‐based beamforming techniques can enhance signal quality by reducing co‐channel interference from mobiles located at angles spatially distinct from the base station. Adopting both smart uplink and downlink beamforming, a communication system with an antenna array can increase the cell coverage of a base station and significantly boost capacity compared with conventional antenna systems. However, successful implementation of DOA‐based beamforming techniques depends on the DOA characteristics. This paper presented the feasibility of direction finding and DOA variation with respect to frequency. Furthermore, the angle spread was studied for selected environments. The results demonstrate the feasibility of applying proposed smart antenna system utilizing DOA‐based beamforming algorithm for increasing channel capacity and improving system performance in frequency‐division‐duplex (FDD) wireless communication systems. Copyright © 2003 John Wiley & Sons, Ltd.     

FEC在3G多媒体实时传输系统中的应用

3G无线传输是多媒体实时传输的新方式,比传统方式更加灵活、便捷。为了克服在3G无线网络传输中的数据丢包问题,提出了利用FEC和交织来提高数据传输正确率的方法,主要研究了交织和RS(204,188)纠错码的在3G传输系统中的设计和实现,最后对整个系统在不同丢包率信道下的性能进行了对比测试。     

从智能网联1.0到智能网联2.0：面向双智的实时数字孪生城市构建

从智能网联（ICV）的发展现状及面临的行业挑战出发,提出了智能网联1.0和智能网联2.0的概念以及相应的发展思路。随后介绍了如何通过泛V2X实现智能网联1.0阶段突破以及通过车城网平台实现双智,并提出智能网联2.0的愿景是构建基于智能网联的交通实时数字孪生以及面向双智的实时数字孪生城市。最后,着重介绍了面向双智的实时数字孪生城市的构建方法以及相关的创新实践。     

光纤传感技术在智能材料损伤定位评估中的应用

传感技术是智能材料结构主要应用的技术之一。智能材料结构中的光纤传感网络分布范围大，传感网络输出信号可以是大面积的分布信号，也可以是数十甚至成千上万个离散的信号，且常常呈非线性。应用光纤传感神经网络的方法对智能型材料损伤定位进行分析研究，可以解决以上实时监控的问题。通过实验，结果表明神经网络技术进行智能材料的损伤定位，可以提高损伤位置的识别率。     

基于一体化摄像机的清晰度评价函数研究

清晰度评价函数的选择是一体化摄像机实现对焦,以获取高质量图像很重要的依据。针对一体化摄像机的实时性和简易行,对几种常用的清晰度评价函数算法分别从高效性、无偏性、单峰性和灵敏度等进行了较全面的性能比较。分析结果表明:Laplace函数和Brenner函数的峰顶宽度相对较窄,灵敏度高,因此适合于小范围精确调焦。Tenengrad函数、Robert函数和平方梯度的峰顶相对较宽,在焦点附近具有比较高的灵敏度,同时也有一定的调焦范围,适于中等范围的自动调焦,这对于一体化摄像机所需要的自动调焦控制具有指导意义。     

移动互联网智能管道自组织架构研究与实践

根据 3GPP 自组织网络规范,提出移动互联网智能管道自组织架构。在智能管道网络中引入集中策略控制功能实体,周期监测外部消息,利用循环神经网络构建最佳策略匹配模型,进行智能管道策略预测、迭代更新和策略下发。对比传统智能管道,本架构实现了智能管道策略智能化定制、实时性管理以及生命周期动态管理,并在“大流量用户”限速、网络高负荷保障以及在线广告推荐等场景得到了有效的应用。     

Ultrasonic thickness measuring in-pipe robot for real-time non-destructive evaluation of polymeric spray linings in drinking water pipe infrastructure

Drinking water pipelines are mainly underground and exposed to corrosion. Polymeric spray liners are used as an economical renewal method to mitigate the consequences of internal corrosion of pipelines and prolong their useful service life by many water utilities around the globe. The quality assurance of such applications is currently limited to closed-circuit television (CCTV), which only provides visual information. As part of the Australian government-funded, thirty-four partner multi-million dollar project (CRC-P: Smart Linings for Pipes and Infrastructure project), this work focuses on measuring the post-application thickness of spray liners in pipes. In this article, we report the innovative development of in-pipe robotic sensing suite that leverages ultrasonic sensing to continuously inspect the thickness of the spray linings through non-destructive measurements. The ultrasonic sensor was calibrated by fabricating laboratory test sample made from polymeric spray linings. Continuous uninterrupted coupling was achieved through a custom designed mechanism which was proven to be reliable through field deployments. Extensive lab tests were conducted to validate the sensor measurements with the benchmark measurements producing results with sub-millimeter accuracy. Following lab validations, field trials in buried pipe assets of Sydney Water were conducted for pipe lengths over 35 $m$, and the field test results show the robotic system is capable of reliably providing accurate spray liner thickness along the pipeline in real-time through non-destructive evaluation.     

大学英语教学网站功能评价指标赋权研究

随着信息技术的快速发展，许多大学建立英语教学网站，对网站功能评价始终是决策者的难题，确定评价指标体系权重是评价的基础性工作，本文运用G1法进行研究。在阐述层次分析法计算权重存在的问题以及G1法优点的基础上，进行了三方面研究：一是研究大学英语教学网站功能，根据功能确定评价指标体系；二是通过具体步骤构建G1法计算权重的数学模型；三是运用数学模型计算评价指标权重。结果表明，用G1法计算权重，具有计算简单、直观、对指标个数没有限制等优点，由于序关系完全表达了专家的意愿，其结果也完全值得信赖。     

基于方向WPS改进TDI CCD遥感图像清晰度评价函数

在轨调焦是航天相机获取高质量图像的关键技术之一。针对航天相机在发射、在轨期间由于振动冲击及温度气压等环境参数变化引起的光学系统离焦现象,以及TDI CCD遥感相机成像场景实时变化的特殊特点,对基于功率谱的清晰度评价函数进行了研究。根据小波变换的多分辨率和带通特性,提出了一种对FFT功率谱的改进小波功率谱（WPS）估计。针对像移亦会导致TDI CCD图像模糊的问题,提出了方向WPS估计算法。参照功率谱地物无关性及离焦会引起功率谱高频分量损失的思路,设计了基于方向WPS的加权清晰度评价函数。实际外场推扫实验结果表明,提出的新清晰度评价函数能有效反映出实际推扫图像的离焦状态,另外相对于FFT功率谱,对场景差异更不敏感,误判率从0.36降低为0,曲线更加饱和。100个仿真样本的平均误判率仅为0.06,满足系统误差要求。因此文中算法满足单调性、灵敏度高、准确度高原则,更适合TDI CCD遥感相机的自动调焦。     

Investigation of capacity and call admission control schemes in TD‐SCDMA uplink systems employing smart antenna techniques

Due to the TDMA (time division multiple access)/time division duplex (TDD) specialization in the uplink (UL) of code division multiplex access (CDMA) systems, some advanced techniques, such as smart antenna (SA) and multi‐user detection (MUD), are utilized conveniently in time division‐synchronous code division multiplex access (TD‐SCDMA) systems. These advanced techniques have great impacts on the capacity and radio resource management (RRM) schemes. In this paper, the UL capacity and load models specified for TD‐SCDMA systems are proposed, in which the impacts from SA and MUD techniques are considered, and the UL load can be estimated based on the total received power in the base station. According to the proposed theoretical capacity and load evaluation models, the call admission control (CAC) strategies suitable for TD‐SCDMA systems are presented. Since there are two kinds of SA schemes (i.e., tracking beam antenna (TBA) and switched beam antenna (SBA)) utilized in TD‐SCDMA systems, the efficient CAC algorithms suitable for these two SA schemes are designed and evaluated, which are based on principles of the interference increase estimation. All simulation results show that the proposed CAC strategies can work efficiently and improve performances of TD‐SCDMA systems dramatically. Copyright © 2009 John Wiley & Sons, Ltd.     

骨骼肌毫秒级功能变化时的结构研究

本文报道了采用两对透射型红外传感器及数字脉冲输出电路组成的双向红外线探测器,与计算机连接,以自研的软件控制超低温快速冷冻固定仪,从超微结构的水平研究生物组织、细胞在毫秒级功能变化时的同步形态变化,并获得骨骼肌在兴奋－收缩偶联发生瞬间的肌细胞超微结构变化     

Sandpiper optimization algorithm with cosine similarity based cross-layer routing protocol for smart agriculture in wireless sensor network assisted internet of things systems

The Internet of Things (IoT) has recently attained a prominent role in enabling smooth and effective communication among various networks. Wireless sensor network (WSN) is utilized in IoT to collect peculiar data without interacting with humans in specific applications. Energy is a major problem in WSN-assisted IoT applications, even though better data communication is achieved through cross-layer models. This paper proposes a new cross-layer-based clustering and routing model to provide a scalable and energy-efficient long data communication in WSN-assisted IoT systems for smart agriculture. Initially, the fuzzy k-medoids clustering approach is used to split the network into various clusters since the formation of clusters plays an important role in energy consumption. Then, a new swarm optimization known as enhanced sparrow search algorithm (ESSA), which is the combination of SSA and chameleon swarm algorithm (CSA), has been introduced for optimal cluster head (CH) selection to solve the energy-hole problems in WSN. A cross-layer strategy has been preferred to provide efficient data transmission. Each sensor node parameter of the physical layer, network layer and medium access control (MAC) is considered for processing routing. Finally, a new bio-inspired algorithm is known as the sandpiper optimization algorithm (SOA), and cosine similarity (CS) has been employed to determine the optimal route for efficient data transmission and retransmission. The simulation of the proposed protocol is implemented by network simulator (NS2), and the simulation results are taken in terms of end-to-end delay, PDR, communication overhead, communication cost, average consumed energy, and network lifetime.     

The performance evaluation of spatial–temporal algorithms in W‐CDMA systems

Differing from FDMA, TDMA, and CDMA, space division multiple access (SDMA) uses space resources to improve communication system performance. Utilizing the smart antenna system is an approach to realize the SDMA technique. Smart antenna systems using the beamforming technique can reduce the co‐channel interference and multipath fading to increase the channel capacity and communication quality. In this study the smart antenna system and rake receiver are integrated. The performance of spatial–temporal structure applied to the W‐CDMA system is evaluated. From the cumulative distribution function simulation results, W‐CDMA system with spatial–temporal algorithm can exactly provide SINR gain to improve the system performance and capacity. Copyright © 2005 John Wiley & Sons, Ltd.