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2013 Second International Japan-Egypt Conference on Electronics, Communications and Computers (JEC-ECC)最新文献

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Adaptive LMS discrete 2-D orthogonal transforms 自适应LMS离散二维正交变换
Mohammad T. Haweel, T. I. Haweel
Two-dimensional discrete orthogonal transforms (2-D DOT) are widely used in many communications and signal processing applications. This paper presents and analyses the general relation between such transforms and the 2-D LMS adaptive algorithm. It is shown that, by proper choice of the adaptation constant, the 2-D LMS provides an exact estimate to the forward as well as backward transform coefficients employing any set of 2-D DOT. The 2-D LMS DOT is modular and allows concurrent computation for the transform coefficients and therefore has the potential for fast parallel computations and VLSI implementation. An efficient 2-D threshold LMS DOT algorithm that is robust against impulsive noise is also presented. The efficiency of the 2-D LMS DOT against roundoff errors is demonstrated. Simulation experiments are conducted to justify the analysis and algorithms introduced.
二维离散正交变换在通信和信号处理中有着广泛的应用。本文给出并分析了这种变换与二维LMS自适应算法之间的一般关系。结果表明,通过适当选择自适应常数,二维LMS可以准确估计任意一组二维DOT的前向和后向变换系数。2-D LMS DOT是模块化的,允许对转换系数进行并发计算,因此具有快速并行计算和VLSI实现的潜力。提出了一种对脉冲噪声具有鲁棒性的二维阈值LMS DOT算法。证明了二维LMS DOT对舍入误差的有效性。仿真实验证明了所介绍的分析和算法的正确性。
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引用次数: 1
Fault tolerant heterogeneous MPSOC schedule length minimization based on platform reliability 基于平台可靠性的容错异构MPSOC调度长度最小化
Hassan A. Youness, A. Omar, M. Moness
Fault tolerant scheduling has been a subject of great concern recently, considering heterogeneous multiprocessor systems that may contain low reliability processors in their systems. Task replication is an established technique to achieve fault tolerance; however it has a negative influence on schedule length. Moreover increasing system reliability always has a negative impact on schedule length. In this paper we devised a new method for optimizing schedule length and maximizing system reliability simultaneously using simulated annealing. Schedule length is investigated in case of fault free operation and in the presence of a processor fault and then the schedule length is averaged based on the probability of the schedule success and failure, then this average schedule length is optimized to the minimum to give the lowest possible makespan in both cases. Results show that our algorithm is able to maximize the system reliability without degrading schedule length, in fact increasing system reliability decrease the averaged schedule length and hence the system overall performance in all cases.
考虑到异构多处理器系统中可能包含低可靠性处理器,容错调度是近年来备受关注的问题。任务复制是实现容错的一种成熟技术;然而,它对时间表长度有负面影响。此外,系统可靠性的提高总是对调度长度产生负面影响。本文提出了一种利用模拟退火方法同时优化调度长度和最大化系统可靠性的新方法。研究了在无故障运行和存在处理器故障的情况下的调度长度,然后根据调度成功和失败的概率对调度长度进行平均,然后将该平均调度长度优化到最小,以在两种情况下给出最小的可能完工时间。结果表明,该算法能够在不降低调度长度的情况下最大化系统可靠性,实际上,在所有情况下,增加系统可靠性会降低平均调度长度,从而降低系统的整体性能。
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引用次数: 2
Modeling of nonlinearities in vibratory ring gyroscopes 振动环式陀螺仪的非线性建模
A. El-Sayed, M. Ghoneima, M. Mahmoud
This paper presents a behavioral model for the ring gyroscope, taking into consideration the effects due to nonlinearity of actuation electrodes. Closed-form expressions for the nonlinear electrostatic force due to any actuation electrode are obtained, and are used as exciting force for the mechanical part of the gyroscope, which is usually modeled as a set of mass-spring-damper systems representing each mode. Nonlinearity of detection electrodes as well as Brownian noise are modeled too. Numerical solution for the equations of motion was done using Simulink to verify the model. The evolution of vibration induced errors due to nonlinearity of actuation and detection electrodes is explained in details. The model helps quantify some important parameters and limitations for the ring gyroscope.
本文建立了考虑致动电极非线性影响的环形陀螺仪行为模型。得到了由任一驱动电极产生的非线性静电力的封闭表达式,并将其作为陀螺仪机械部分的激励力,通常将其建模为代表每种模态的一组质量-弹簧-阻尼系统。并对检测电极的非线性和布朗噪声进行了建模。利用Simulink对运动方程进行了数值求解,验证了模型的正确性。详细解释了由驱动电极和检测电极非线性引起的振动诱导误差的演化过程。该模型有助于量化环形陀螺仪的一些重要参数和限制。
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引用次数: 3
An all-NMOS-transistors digital-to-analog converter 一个全nmos晶体管数模转换器
S. Sharroush
There is no doubt that the analog-to-digital (A/D) and digital-to-analog (D/A) converters are two of the most important analog integrated circuits in almost all of the applications. However, several types of D/A converters employ resistors which consume a relatively large silicon area in addition to their poor tolerance. In this paper, an-all-NMOS-transistors D/A converter that depends on charging a capacitor to a voltage that is proportional to the decimal equivalent of the input bits is proposed. This technique can be extended to any number of input bits and will be simulated for the 0.13 μm CMOS technology with VDD = 1.2 V. The choice of the aspect ratios of the employed NMOS transistors will be investigated quantitatively.
毫无疑问,模数(A/D)和数模(D/A)转换器是几乎所有应用中最重要的两种模拟集成电路。然而,几种类型的D/A转换器采用的电阻除了公差差之外,还消耗了相对较大的硅面积。本文提出了一种全nmos晶体管的D/A转换器,该转换器依赖于将电容器充电到与输入位的十进制等效成比例的电压。该技术可以扩展到任意数量的输入位,并将在VDD = 1.2 V的0.13 μm CMOS技术上进行模拟。所采用的NMOS晶体管长宽比的选择将被定量地研究。
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引用次数: 0
A proximity-fed ultra-wide band patch antenna with four frequency-band notches 一种近馈超宽带贴片天线,具有四个频带缺口
A. Ghattas, E. Khaled
A proximity feed ultra-wide band (UWB) patch antenna with four notched bands is presented. The proposed antenna introduces UWB performance in the frequency range of 1.9 GHz to 10.3 GHz with omnidirectional radiation pattern. Slots etching techniques are utilized to provide four notched bands at frequencies of 2.3, 2.8, 3.5, and 5.5 GHz to avoid the interference with the wireless networks which occupy bands at these frequencies. The analysis and design of the proposed antenna were carried out using the commercially available Ansoft high frequency structure simulator (HFSS). The antenna is fabricated and tested. The measured data of the fabricated antenna demonstrate very good agreement with the simulated results.
提出了一种具有四个陷波带的近馈超宽带贴片天线。该天线在1.9 GHz ~ 10.3 GHz频率范围内具有全向辐射方向图的超宽带性能。利用槽蚀技术在2.3、2.8、3.5和5.5 GHz的频率上提供四个陷波带,以避免对占用这些频率的无线网络的干扰。利用市售的Ansoft高频结构模拟器(HFSS)对所提出的天线进行了分析和设计。制作并测试了天线。所制天线的实测数据与仿真结果吻合较好。
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引用次数: 2
Applying granular computing in uncertain optimization problems 颗粒计算在不确定优化问题中的应用
A. Alsawy, H. Hefny
Shortest path problem got a lot of attention from many researchers, in our case the distances between the nodes are represented by different types of uncertain numbers such as: interval numbers, fuzzy numbers, rough numbers and also some of them could be represented by classical real numbers. These heterogeneous types of numbers are forming a challenge in calculation the shortest path. In this work we propose a Unified Granular Number (UGN), that we call it G- Number to act as a general form for any uncertain granular number. G- Number represents higher level of abstract that hold only common properties of different types of uncertain granular numbers while ignoring some particular properties which are not necessary to be considered in such higher abstract level. The main benefit of using such a proposed G- number is the ability to represent all types of granular numbers using unified formality that greatly simplifies arithmetic operations.
最短路径问题受到了许多研究者的关注,在我们的案例中,节点之间的距离由不同类型的不确定数表示,如:区间数、模糊数、粗糙数,其中一些可以用经典实数表示。这些异构类型的数字给最短路径的计算带来了挑战。在本文中,我们提出了一个统一颗粒数(UGN),我们称之为G-数作为任何不确定颗粒数的一般形式。G- Number代表更高层次的抽象,它只保留不同类型不确定颗粒数的共同性质,而忽略了一些在更高抽象层次中不需要考虑的特殊性质。使用这种建议的G数的主要好处是能够使用统一的形式表示所有类型的颗粒数,从而大大简化了算术运算。
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引用次数: 0
1T-1C FRAM cell reading without reference-voltage generation 1T-1C FRAM电池读数无参考电压产生
S. Sharroush
Reading 2T-2C ferroelectric random-access memory (FRAM) cells does not require generating a reference voltage as this architecture is self-referenced. However, this architecture consumes a relatively large silicon area. So, 1T-1C FRAMs are used instead. Reading 1T-1C FRAMs, however, requires generating a reference voltage that is ideally halfway between the bitline voltage generated in case of “0” reading, V0, and in case of “1” reading, V1. Then, this reference voltage will be compared with the bitline voltage by a sense amplifier. In this paper, a preview of some of the schemes that does not require generating a reference voltage will be introduced. Then, a novel reading scheme that does not require the generation of a reference voltage and depends on using two cascaded inverters is discussed. The proposed scheme will be simulated for the 0.13 μm CMOS technology and shows a 60% reduction in the read access time for stored “1”. The reduction in the read access time can be attributed to the fact that the output data will be taken at a parasitic capacitance that is much smaller than the bitline parasitic capacitance.
读取2T-2C铁电随机存取存储器(FRAM)单元不需要产生参考电压,因为该架构是自参考的。然而,这种架构消耗了相对较大的硅面积。因此,使用1T-1C fram代替。然而,读取1T-1C fram需要产生一个参考电压,理想情况下,该电压介于读取“0”时产生的位线电压V0和读取“1”时产生的位线电压V1之间。然后,这个参考电压将通过一个感测放大器与位线电压进行比较。本文将介绍一些不需要产生参考电压的方案的预览。然后,讨论了一种不需要产生参考电压并依赖于使用两个级联逆变器的新型读取方案。该方案将在0.13 μm CMOS技术上进行仿真,结果表明存储“1”的读访问时间减少了60%。读访问时间的减少可以归因于这样一个事实,即输出数据将以比位线寄生电容小得多的寄生电容获取。
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引用次数: 1
Matching between the cutting blade velocity and tissue swelling of Head and Neck using Support Vector Machine 基于支持向量机的切削刀片速度与头颈部组织肿胀的匹配
G. Gouid, A. A. Nasser, M. Z. Mostafa, D. El-Hennawi
The objective of this paper is to ensure compatibility between cutting blade velocity and the removed tissues without lacerations. This maintains the integrity of the tissues adjacent to the tumor. A Support Vector Machine (SVM) algorithm is applied to the Head and Neck tumors images. This includes two main steps, identifying the region having Laceration, and measuring the percentage of the laceration. The algorithm is applied to 20 sets of real data in the form of images for the adenoid and head and neck tumor tissues before and after the removal operation. This is followed by calculating the force exerted by the cutting blade, the cutting angle, and the cutting velocity that causes minimum laceration. The simulation results show good agreement with the actual operation results.
本文的目的是确保切割刀片速度与被切除组织之间的相容性,而不会造成撕裂。这保持了肿瘤附近组织的完整性。将支持向量机(SVM)算法应用于头颈部肿瘤图像。这包括两个主要步骤,确定有撕裂伤的区域,并测量撕裂伤的百分比。将该算法应用于腺样体和头颈部肿瘤组织切除手术前后的20组真实图像数据。接下来是计算切割刀片所施加的力,切割角度,以及导致最小撕裂的切割速度。仿真结果与实际运行结果吻合较好。
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引用次数: 0
Automatic arabic number plate recognition 自动阿拉伯车牌识别
A. Abd El Rahman, A. Hamdy, F. Zaki
This paper presents a license plate recognition system for the Egyptian plates introduced in 2008. The proposed system is composed of three main stages; localization & skew correction stage, segmentation stage, and recognition stage. The localization stage uses the main feature of the plate where high contrast text-background is tagged with colored or gray area, to find the plate candidates in the image and to measure the skew angle. In segmentation stage, connected component analysis is applied to find objects belong to license number. The objects will be analyzed to attach diacritic and over segmented objects to each other to form a group of recognizable objects. The final objects will be split to digits and letter groups. In recognition stage, an adapted template match technique is introduced to recognize the digits and letter groups separately after normalizing them. The system is tested against a real video of two hours and the accuracy was 81% and average time per frame was 24 msec/frame.
本文介绍了2008年推出的埃及车牌识别系统。该系统主要分为三个阶段;定位和纠偏阶段,分割阶段,识别阶段。定位阶段利用高对比度文本背景被彩色或灰色区域标记的车牌的主要特征,在图像中找到候选车牌并测量倾斜角度。在分割阶段,采用连通成分分析方法寻找属于许可证编号的对象。对这些对象进行分析,将变音符和过度分割的对象相互连接起来,形成一组可识别的对象。最后的对象将被分成数字和字母组。在识别阶段,引入自适应模板匹配技术,对数字和字母组进行归一化后分别识别。该系统对一个2小时的真实视频进行了测试,准确率为81%,平均每帧时间为24毫秒/帧。
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引用次数: 3
The impact of changing HNL-DSF parameters on wavelength exchanging 改变HNL-DSF参数对波长交换的影响
Tawfik Ismail, J. El-Azab, Y. Badr
Integrated Fiber (IF) approach for optical signal processing offers significant advantages in both performance and cost when compared to conventional electrical processing. The main problem in optical single processing is to maintain the data in the optical domain without converting it to the electrical domain. Currently, many devices have been proposed for processing the data in the optical domain. The Wavelength Optical Crossbar (WOC), one of the important devices in optical networks, has been developed based on the phenomenon of wavelength exchanging. High-NonLinear Dispersion Shifted Fiber (HNL-DSF) provides a good performance due to the high mixing efficiency. In this paper, we will study the impacts of changing the HNL-DSF parameter on the wavelength exchanging.
集成光纤(IF)方法用于光信号处理与传统的电处理相比,在性能和成本上都具有显著的优势。光单处理的主要问题是保持光域数据而不将其转换为电域数据。目前,已经提出了许多用于光域数据处理的器件。波长光交叉条(Wavelength Optical Crossbar, WOC)是基于波长交换现象而发展起来的光网络中的重要器件之一。高非线性色散位移光纤(HNL-DSF)由于混合效率高而具有良好的性能。在本文中,我们将研究改变HNL-DSF参数对波长交换的影响。
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引用次数: 2
期刊
2013 Second International Japan-Egypt Conference on Electronics, Communications and Computers (JEC-ECC)
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