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An efficient off-grid high-elevation electric generation system using wind power 利用风力发电的高效离网高海拔发电系统
Pub Date : 2014-12-01 DOI: 10.1109/ICET.2014.7021032
A. A. Shah, Salim Ullah, S. Ali Shah, M. Asif Manzoor, K. Yahya
Though Wind Energy being the most readily usable source of electric power, in general, amongst the class of renewable resources, cannot readily be used as potential electric power source when compared to fossil fuels ; the comparatively bleak energy content at lower heights being its drawback. In the proposed work an effort is made to overcome this shortcoming by taking the advantage of greater wind speeds at higher elevations by bringing into use the heights of the high rise structures .e.g. Residential and shopping complexes, Mobile communication towers etc. As the electric power generated by a wind turbine increases in a cubic order with wind speed so the heights of relatively taller buildings and towers, in the order of tens of feet, is one of great significance. The prototype system, consisting of a small wind turbine interfaced with PC, deployed at a test site was used for monitoring the wind conditions as well as the actual electric power generation on a small scale. The data acquired thus along with actual wind profile recorded at the site over a period of time from other sources were further used in the simulation of a system harnessing power at different heights. A budgeting software was also used in order to keep track of the prices incorporated and financial assessment of the system. While keeping structural stresses within safe limits, the ultimate electrical power generated can be of such orders that it can be used to partly fulfill the running demand of a residential building.
虽然风能是最容易使用的电力来源,但总的来说,在可再生资源类别中,与化石燃料相比,风能不能轻易用作潜在的电力来源;较低高度的能量含量相对较低是它的缺点。在建议的工作中,通过利用高层结构的高度,利用较高海拔处较大风速的优势,努力克服这一缺点。住宅、商场、移动通讯塔等。由于风力发电机产生的电力随着风速呈立方级数增加,所以相对较高的建筑物和塔楼的高度,在几十英尺的数量级,是具有重要意义的。该原型系统由一个与PC接口的小型风力涡轮机组成,部署在一个试验场,用于监测风力条件以及小规模的实际发电。由此获得的数据以及在现场一段时间内从其他来源记录的实际风廓线进一步用于模拟不同高度的电力系统。还使用了预算软件,以便跟踪纳入的价格和系统的财务评估。在保持结构应力在安全范围内的同时,产生的最终电力可以达到这样的水平,它可以部分地满足住宅建筑的运行需求。
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引用次数: 0
A state-based fitness function for the integration testing of object-oriented programs 面向对象程序集成测试的基于状态的适应度函数
Pub Date : 2014-12-01 DOI: 10.1109/ICET.2014.7021011
Muhammad Bilal Bashir, A. Nadeem
Testing object-oriented program is quite challenging task due to the nature of its features like inheritance and polymorphism. In practice test case generation is the most laborious and resource consuming process in software testing hence generating test data for object-oriented programs is even more challenging and effort demanding. Object-oriented evolutionary testing aims at automating test case generation process using evolutionary strategies like Genetic Algorithm. Evolutionary testing gives a helping hand to the software testers to speed up the process and to reduce the amount of project resources. The existing approaches provide sound platform to the researchers to take the work further to meet the challenges that object-oriented paradigm has introduced. One of the limitations in existing approaches is that they combine branch distance of object's state variables with local variables that leaves no guidance for the search process whether object has gained desired state or not. We propose a state-based fitness function for the evolutionary testing of object-oriented programs that can solve object's state problem by evaluating object's state as an independent segment of overall test case fitness. Our initial experiments show that by separating object's state evaluation, search gets better guidance to prevent object's state problem.
由于面向对象程序的特性(如继承和多态性)的性质,测试面向对象程序是一项相当具有挑战性的任务。在实践中,测试用例的生成是软件测试中最费力和消耗资源的过程,因此为面向对象程序生成测试数据更具挑战性和费力性。面向对象的进化测试旨在使用遗传算法等进化策略自动化测试用例生成过程。进化测试为软件测试人员提供了帮助,以加快过程并减少项目资源的数量。现有的方法为研究人员提供了良好的平台,使他们能够进一步开展工作,以应对面向对象范式带来的挑战。现有方法的局限性之一是将对象状态变量的分支距离与局部变量相结合,对搜索过程中对象是否达到期望状态没有指导作用。我们提出了一个基于状态的适应度函数用于面向对象程序的进化测试,该函数通过将对象的状态作为整体测试用例适应度的一个独立部分进行评估来解决对象的状态问题。我们的初步实验表明,通过分离对象的状态评估,搜索得到了更好的指导,防止了对象的状态问题。
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引用次数: 2
Performance comparison of Hadoop Clusters configured on virtual machines and as a cloud service 配置在虚拟机上和作为云服务的Hadoop集群的性能比较
Pub Date : 2014-12-01 DOI: 10.1109/ICET.2014.7021017
M. F. Hyder, M. A. Ismail, Hameeza Ahmed
Cloud computing is an emerging trend for online computing and resource management. OpenStack is one of the most widely used open source platform for building public and private clouds. Whereas, Apache Hadoop is an open source framework use to process large data sets spread across clusters of computers. Currently both OpenStack and Apache Hadoop are sharing the major consideration in research and open source communities. This paper focuses on integration of Hadoop Cluster on OpenStack cloud as it's one of the services and then highlights the performance comparison of Hadoop cluster implemented with that of Hadoop cluster configured separately. The results concluded show the successful implementation of Hadoop as a cloud service and its performance enhancement in comparison to native virtual Hadoop cluster.
云计算是在线计算和资源管理的新兴趋势。OpenStack是用于构建公有云和私有云的最广泛使用的开源平台之一。然而,Apache Hadoop是一个开源框架,用于处理跨计算机集群的大型数据集。目前,OpenStack和Apache Hadoop都是研究和开源社区的主要关注点。本文重点研究了作为服务之一的Hadoop集群在OpenStack云上的集成,并重点分析了实现后的Hadoop集群与单独配置的Hadoop集群的性能比较。最后的结果显示了Hadoop作为云服务的成功实现以及与本地虚拟Hadoop集群相比其性能的增强。
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引用次数: 6
A novel design of RF MEMS shunt switch with dimples and meanders 一种新颖的带凹槽和弯曲的RF MEMS并联开关设计
Pub Date : 2014-12-01 DOI: 10.1109/ICET.2014.7021028
M. Hassan, F. A. Tahir, H. Rahman
The paper presents the design of an RF MEMS capacitive shunt switch with the use of dimples and meanders. With optimized meander structure and the use of two dimples below the bridge, the switch presents excellent RF performance. The EM modeling and results are achieved in HFSS and the mechanical modeling and stress analysis is done in ANSYS. The bridge structure with dimples and meanders shows the insertion loss to be less than 0.09 dB up to 35GHz and the isolation as high as 29 dB up to 40GHz. The calculated actuation voltage is 59V.
本文介绍了一种利用微窝和曲线的射频微机电系统容性并联开关的设计。通过优化的弯曲结构和在桥下使用两个凹槽,该开关具有优异的射频性能。在HFSS中进行了电磁建模和结果分析,在ANSYS中进行了力学建模和应力分析。采用带凹槽和弯曲的桥接结构,在35GHz下的插入损耗小于0.09 dB,在40GHz下的隔离度高达29 dB。计算的驱动电压为59V。
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引用次数: 2
Comparative analysis of chaotic and non-chaotic image encryption schemes 混沌与非混沌图像加密方案的比较分析
Pub Date : 2014-12-01 DOI: 10.1109/ICET.2014.7021021
M. Bin Younas, Jawad Ahmad
In modern era, multimedia technologies have been developed significantly. Multimedia data such as audio, video and image transfers over the internet is open and insecure. Security is required for storage and transmission of digital images to avoid from unauthorized entities. A number of encryption schemes have been developed for security of multimedia data over insecure channel. So, there is a real need to compare encryption schemes that which technique is better for multimedia application. This paper presents the estimation for the good image encryption algorithm. Chaos based image encryption algorithm are used now a days because of better security and good performance. Behaviour of chaotic system is nonlinear, deterministic and sensitive to initial condition. A number of parameters, like correlation coefficient, information entropy, compression friendliness, number of pixels change rate, average intensity and unified average change intensity etc., are used to check the quality of cipher-text image. This work is review of two image encryption schemes, namely Compression Friendly Encryption Scheme (CFES) and Chaos Based Encryption Scheme (CBES).
在现代,多媒体技术有了很大的发展。多媒体数据,如音频、视频和图像在互联网上传输是开放的和不安全的。数字图像的存储和传输需要安全性,以避免未经授权的实体。为了保证多媒体数据在不安全信道上的安全,人们开发了许多加密方案。因此,有必要对加密方案进行比较,以确定哪种技术更适合多媒体应用。提出了一种好的图像加密算法的估计方法。基于混沌的图像加密算法由于具有较好的安全性和较好的性能,目前得到了广泛的应用。混沌系统的行为具有非线性、确定性和对初始条件的敏感性。使用相关系数、信息熵、压缩友好度、像素个数变化率、平均强度和统一平均变化强度等参数来检验密文图像的质量。本文综述了两种图像加密方案,即压缩友好加密方案(CFES)和基于混沌的加密方案(CBES)。
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引用次数: 22
Performance of double threshold energy detection in cooperative-cognitive networks over Nakagami-m fading channels using square law combining technique 基于平方律组合技术的协同认知网络中Nakagami-m衰落信道双阈值能量检测性能
Pub Date : 2014-12-01 DOI: 10.1109/ICET.2014.7021027
Atta-ur Rahman, Ansar Ul Haq, M. Adnan, I. Khan, I. Shah
This paper presents the performance of double threshold energy detection in cooperative cognitive networks over Nakagami-m fading channel. Square Law Combining (SLC) diversity technique helps in detection at cognitive center for different values of shape factor M and this algorithm is examined by placing multiple relays between Primary user (PU) and Secondary user (SU). Performance of the network has been analyzed for amplify and forward relaying scheme as irrespective of their location and distance from the primary users and cognitive center. The simulated results are shown for detection probability (Pd), collision probability (Pc) and unavailable probability (Pn).
本文研究了协作认知网络在Nakagami-m衰落信道上的双阈值能量检测性能。平方律组合(SLC)分集技术有助于在认知中心对形状因子M的不同值进行检测,并通过在主用户(PU)和副用户(SU)之间设置多个中继来检验该算法。分析了放大和转发中继方案在与主用户和认知中心的位置和距离无关的情况下的网络性能。给出了检测概率(Pd)、碰撞概率(Pc)和不可用概率(Pn)的仿真结果。
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引用次数: 0
Analysing the performance of EIT images using the point spread function 用点扩展函数分析EIT图像的性能
Pub Date : 2014-12-01 DOI: 10.1109/ICET.2014.7021013
Alamgir Naushad, A. Rashid, Suleman Mazhar
Electrical impedance tomography (EIT) is a noninvasive medical imaging technique in which a small current is applied to the electrodes attached to the surface of a subject body and a cross-sectional image of the resistivity (or conductivity) distribution inside the body is reconstructed using an inverse algorithm. Due to the ill-posed nature of EIT inverse problem, EIT bears poor spatial resolution and behaves non-linearly in nature. Point spread function (PSF), which is calculated over the whole domain as responses to a small circular anomaly moving around the entire domain, is a characteristic parameter to estimate the performance of imaging systems. In order to analyze the quality of EIT reconstructed image, PSF is employed in this work. PSF incorporates the key imaging attributes, comprising amplitude response, resolution, position error, shape deformation and ringing effect. This paper presents a numerical study on the use of PSF for static and dynamic EIT image reconstruction. The static image reconstruction is done using the modified Newton Raphson (mNR) algorithm whereas the dynamic image reconstruction is done with extended Kalman filter (EKF). A detailed analysis of the performance of mNR and EKF has been carried out based upon on the imaging attributes gathered using the said algorithms. The results are convincing and provide a fresh perspective to use the PSF in order to analyze the performance of EIT image reconstruction.
电阻抗断层扫描(EIT)是一种非侵入性医学成像技术,它将小电流施加到附着在受试者表面的电极上,然后使用逆算法重建身体内部电阻率(或电导率)分布的横截面图像。由于EIT反问题的病态性,使得EIT的空间分辨率较差,具有非线性性质。点扩散函数(PSF)是评价成像系统性能的一个特征参数,它是在整个区域上计算对整个区域内移动的小圆形异常的响应。为了分析EIT重构图像的质量,本文采用了PSF算法。PSF包含了关键的成像属性,包括振幅响应、分辨率、位置误差、形状变形和振铃效应。本文对PSF在静态和动态EIT图像重建中的应用进行了数值研究。静态图像重建采用改进的Newton Raphson (mNR)算法,动态图像重建采用扩展卡尔曼滤波(EKF)算法。基于使用上述算法收集的图像属性,对mNR和EKF的性能进行了详细的分析。结果令人信服,并为使用PSF分析EIT图像重建性能提供了一个新的视角。
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引用次数: 4
A mitigation strategy against malicious Primary User Emulation Attack in Cognitive Radio networks 认知无线网络中恶意主用户仿真攻击的缓解策略
Pub Date : 2014-12-01 DOI: 10.1109/ICET.2014.7021026
Bilal Naqvi, Shafaq Murtaza, B. Aslam
The increasing demand of usable spectrum range startled the world of serious shortage in coming years. Cognitive Radio technology emerged to solve this problem by allowing unlicensed users to utilize the spectrum resources whenever the licensed users are not active. With the emergence of this technology many security issues arose, that if successful may hamper all the benefits this promising technology has to offer. Among many other security issues Primary User Emulation Attack is one. In this paper we discuss the Primary User Emulation Attack. We also discuss the existing work in the field, along with its limitations. We also elucidate the effects of this attack through simulation results. In the end we describe our proposed approach to counter the Primary User Emulation Attack.
对可用频谱范围日益增长的需求使世界在未来几年里面临着严重的频谱短缺。认知无线电技术的出现就是为了解决这个问题,它允许未经许可的用户在许可用户不活跃时利用频谱资源。随着这项技术的出现,出现了许多安全问题,如果成功,可能会阻碍这项有前途的技术所提供的所有好处。在许多其他安全问题中,主要用户模拟攻击是其中之一。本文主要讨论了主用户仿真攻击。我们还讨论了该领域的现有工作,以及它的局限性。我们还通过仿真结果阐明了这种攻击的影响。最后,我们描述了我们提出的对抗主用户仿真攻击的方法。
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引用次数: 6
Utilizing distinct terms for proximity and phrases in the document for better information retrieval 在文档中使用不同的术语表示接近度和短语,以便更好地进行信息检索
Pub Date : 2014-12-01 DOI: 10.1109/ICET.2014.7021024
M. I. Rafique, M. Hassan
The rapid increase in web data has led the users to search the web for information. Users want their queries to be more relevant to the documents. For this purpose, the idea of proximity is utilized where close query terms in the document show high proximity and hence the document is likely to be more relevant. But almost every retrieval function (e.g., BM25) uses bag-of-words technique, thus ignoring the importance of proximity. In this paper, we find such short sentences (sub-sentences) or group of words that are made by distinct words or terms on their first occurrence in the documents to calculate the proximity and subsequently incorporate it into a retrieval function to improve the ranking of the documents. We have shown that there are significant numbers of short sentences formed by distinct words that can be used to exploit proximity and phrase search. Furthermore, turning the non-positional (record level) inverted index into partial-positional inverted index by utilizing distinct terms (UDT), the UDT partial-positional inverted index has been separated from the full positional (word level) inverted index to calculate proximity among the distinct terms efficiently. As calculating proximity with full positional inverted index is complex and computationally expensive, the proximity with the UDT partial-positional inverted index can be computed easily and efficiently. Experiments on various data sets have shown that the proposed approach has improved the precision of the documents.
网络数据的快速增长导致用户在网络上搜索信息。用户希望他们的查询与文档更加相关。出于这个目的,在文档中接近的查询词显示高度接近的情况下,使用接近的概念,因此文档可能更相关。但是几乎每个检索函数(例如BM25)都使用词袋技术,从而忽略了接近度的重要性。在本文中,我们找到由不同的词或术语在文档中首次出现时组成的短句(子句)或一组词来计算接近度,并随后将其纳入检索函数以提高文档的排名。我们已经证明,有相当数量的由不同的单词组成的短句可以用来利用接近度和短语搜索。此外,利用不同项(UDT)将非位置(记录级)倒排索引转化为部分位置倒排索引,将UDT部分位置倒排索引与完整位置(词级)倒排索引分离,从而有效地计算不同项之间的接近度。由于全位置倒排索引的接近度计算复杂且计算量大,而UDT部分位置倒排索引的接近度计算简单有效。在各种数据集上的实验表明,该方法提高了文档的精度。
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引用次数: 2
Design and implementation of an intelligent energy saving system 一种智能节能系统的设计与实现
Pub Date : 2014-12-01 DOI: 10.1109/ICET.2014.7021031
Adil Murad, Salim Ullah, A. A. Shah, L. Hasan, K. Khan, A. Khan
The energy crisis is one of the major problems faced by Pakistan at the moment. It has adversely affected the industrial growth and restrained business nourishment which in turn has affected the overall economy of Pakistan. Proper energy saving measures need to be implemented in order to reduce the energy shortfall. The proper and efficient use of energy also helps in reducing different kinds of pollution. In this paper, we have presented an intelligent power saving system, capable of saving electricity, minimizing electricity risks in workplaces, all in an automated manner. The developed system is economical and easy to install. It can be used to reduce the energy consumption of every kind of electric device in residential as well commercial buildings.
能源危机是巴基斯坦目前面临的主要问题之一。它对工业增长产生了不利影响,并抑制了商业营养,从而影响了巴基斯坦的整体经济。为了减少能源短缺,需要采取适当的节能措施。正确和有效地使用能源也有助于减少各种污染。在本文中,我们提出了一种智能节电系统,能够以自动化的方式节省电力,最大限度地降低工作场所的电力风险。所开发的系统经济、安装方便。它可以用于降低住宅和商业建筑中各种电气设备的能耗。
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引用次数: 1
期刊
2014 International Conference on Emerging Technologies (ICET)
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