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2009 12th International Conference on Computers and Information Technology最新文献

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Numerical analysis of impedance matched Inverted-L antennas for Wi-Fi operations Wi-Fi操作中阻抗匹配的倒l天线的数值分析
Pub Date : 2009-12-01 DOI: 10.1109/ICCIT.2009.5407323
K. M. Morshed, D. Karmokar, A. Mobin
This paper presents the numerical simulations of Inverted-L and stair inverted-L antennas capable of generating high gain with less than 1.5 dBi gain variation within the −10 dB return loss bandwidth for 5.5 GHz wireless-fidelity (Wi-Fi) operation with and without resistor-inductor-capacitor (RLC) impedance matching network. Moreover, the proposed antennas can provide bandwidth of 510 and 120 MHz respectively, making it easily cover the required bandwidths for Wi-Fi operation in the 5.5 GHz band. In application of matching network, the input impedance of the antennas well matched to the feeding cable, also improvement in return loss and voltage standing wave ratio (VSWR) is achieved.
本文介绍了在有或没有电阻-电感-电容(RLC)阻抗匹配网络的情况下,能够在−10 dB回波损耗带宽内产生小于1.5 dBi增益变化的5.5 GHz无线保真度(Wi-Fi)工作的倒l型和阶梯倒l型天线的数值模拟。此外,所提出的天线可以分别提供510 MHz和120 MHz的带宽,使其轻松覆盖5.5 GHz频段Wi-Fi运行所需的带宽。在匹配网络的应用中,天线的输入阻抗与馈电电缆很好地匹配,也改善了回波损耗和驻波比。
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引用次数: 12
Packing identical circles in a minimized circular container by Monotonic Basin Hopping heuristic approach 用单调跳盆启发式方法在最小化圆形容器中填充同圆
Pub Date : 2009-12-01 DOI: 10.1109/ICCIT.2009.5407178
A. J. U. Jamali, A. Grosso, M. Locatelli, F. Schoen
Packing problems have mathematical as well as practical application point of interest. We present, here, Monotonic Basin Hopping heuristic approach to solve the problem of packing identical circles within a minimum size of circular container. Extensive computational experiments have been performed for analyzing the problem as well as for choosing an appropriate way the parameter values for the proposed methods. Several improvements with respect to the best results reported in the literature have been detected.
包装问题既有数学意义又有实际应用意义。在这里,我们提出了一种单调跳盆启发式方法来解决在最小尺寸的圆形容器内填充相同圆的问题。进行了大量的计算实验来分析问题,并为所提出的方法选择合适的参数值。对于文献中报道的最佳结果,已经发现了一些改进。
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引用次数: 0
Bangla Hand Written digit recognition using supervised locally linear embedding algorithm and Support Vector Machine 基于监督局部线性嵌入算法和支持向量机的孟加拉文手写数字识别
Pub Date : 2009-12-01 DOI: 10.1109/ICCIT.2009.5407269
Saleh Ahmed, Md. Rashedul Islam, M. S. Azam
This paper presents Bangla numeral Character Recognition System using supervised locally linear embedding algorithm and Support Vector Machine (SVM). The locally linear embedding (LLE) algorithm is an unsupervised technique proposed for nonlinear dimensionality reduction. In this paper, we describe its supervised variant (SLLE). Where class membership information is used to map overlapping high dimensional data into disjoint clusters in the embedded space. we combined it with support vector machine (SVM) for classifying handwritten digits from the On-Line Handwritten Bangla Numeral Database.
本文提出了一种基于监督局部线性嵌入算法和支持向量机的孟加拉语数字字符识别系统。局部线性嵌入(LLE)算法是一种用于非线性降维的无监督算法。在本文中,我们描述了它的监督变体。其中类隶属信息用于将重叠的高维数据映射到嵌入空间中不相交的簇中。我们将其与支持向量机(SVM)相结合,对在线手写体孟加拉语数字数据库中的手写体数字进行分类。
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引用次数: 8
Design and development of a wall climbing Robot and its control system 爬壁机器人及其控制系统的设计与开发
Pub Date : 2009-12-01 DOI: 10.1109/ICCIT.2009.5407120
M. Akhtaruzzaman, Nurul Izzati Bt Samsuddin, Norsofiana Bt Umar, Mozasser M. Rahman
The Robot, named as TRAIN WALL BOT, is designed to navigate on smooth vertical surfaces with the capability to avoid obstacles and overcome if the height is about 1cm. The design is inspired from train steel wheel movement that contains two actuated legs with rotary motion provided by a DC motor. The Robot uses pneumatic system and the suction force is supplied by an air compressor that turns on intermittently. The suction force ensures the attachment of the robot with the wall by using 3 vacuum valves and 6 vacuum pads. The robot is controlled using PIC 16F877A. Two limit switches are used to acknowledge the contact with its navigating surface. Vacuum suction is controlled based on the ON OFF priority of the limit switches. Though the design is quiet simple but it is capable to walk, climb vertical smooth surfaces and avoid obstacles. Forward and backward movements are also faster, smoother and more stable (because of the coupling design) than other existing wall climbing Robots. In this paper, various aspects of prototype design and development of the Climbing Robot are conveyed including the body, leg, feet design and gait dynamics.
这款名为TRAIN WALL BOT的机器人可以在光滑的垂直表面上行驶,如果高度在1厘米左右,它就能避开障碍物并克服障碍。设计灵感来自火车钢轮运动,它包含两个驱动腿,由直流电机提供旋转运动。机器人采用气动系统,吸力由间歇开启的空气压缩机提供。吸力通过使用3个真空阀和6个真空垫来保证机器人与壁面的附着。机器人采用PIC 16F877A控制。两个限位开关用于确认与其导航表面的接触。真空吸力是根据限位开关的on - OFF优先级来控制的。虽然设计很简单,但它能够行走,爬上垂直光滑的表面,避开障碍物。向前和向后的运动也比其他现有的爬墙机器人更快、更平稳、更稳定(因为耦合设计)。本文介绍了攀爬机器人的原型设计和开发的各个方面,包括身体、腿、脚的设计和步态动力学。
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引用次数: 25
Moving object tracking - a parametric edge tracking approach 运动目标跟踪-一种参数化边缘跟踪方法
Pub Date : 2009-12-01 DOI: 10.1109/ICCIT.2009.5407285
M. Murshed, M. Ali, Akber Dewan, O. Chae
In this paper, an edge based tracking algorithm is proposed. Our algorithm makes efficient use of edge-segment on the Canny edge map by utilizing the edge structure in the moving object region. Curvature-based features are used for moving edge registration. We use the maximum curvature correspondences between two edge segments then the 2D affine transformation computes their movement by solving a system of linear equations. The registration error is then minimized. A Kalman Filter is used to track each individual edge segments. Segments are clustered using a k-mean algorithm. Finally, a group motion tracker is used for tracking moving object from each cluster. Experiments show that our edge-segment based tracking algorithm can track moving objects efficiently under varying illumination conditions.
本文提出了一种基于边缘的跟踪算法。该算法通过利用运动目标区域的边缘结构,有效地利用了Canny边缘图上的边缘段。基于曲率的特征用于移动边缘配准。我们使用两个边缘段之间的最大曲率对应,然后二维仿射变换通过求解线性方程组来计算它们的运动。然后最小化配准误差。卡尔曼滤波器用于跟踪每个单独的边缘段。使用k-均值算法对片段进行聚类。最后,利用群运动跟踪器对每个簇中的运动目标进行跟踪。实验表明,基于边缘段的跟踪算法可以在不同光照条件下有效地跟踪运动目标。
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引用次数: 9
Effectiveness of selection and maximal ratio combining diversity techniques on a DS-CDMA wireless communication system impaired by fading 选择和最大比组合分集技术在DS-CDMA无线通信系统中的有效性受到衰落的影响
Pub Date : 2009-12-01 DOI: 10.1109/ICCIT.2009.5407154
M. Hossain, Md. Rubaiyat H. Mondal
The effectiveness of different diversity combining techniques in improving the bit error rate (BER) performance of a direct- sequence code-division multiple-access (DS-CDMA) system is presented in this paper. The overall performance of a DS-CDMA system is degraded by multipath fading and additive white Gaussian noise (AWGN). To evaluate the degradation, the expression for the conditional BER, conditioned on a given level of fading is derived and then the unconditional BER is evaluated. This approach is also extended to estimate the BER performance of the system having multiple receiving antennas. The selection method and maximal ratio combining (MRC) method are employed as diversity combining schemes and it is found that both the schemes offer almost the same BER improvement. Moreover, convolutional channel coding is applied in the DS-CDMA system and it is noted to provide more enhancements in the system performance.
本文研究了不同的分集组合技术在提高直接序列码分多址(DS-CDMA)系统误码率性能方面的有效性。多径衰落和加性高斯白噪声(AWGN)会降低DS-CDMA系统的整体性能。为了评估退化,推导了以给定衰落水平为条件的条件误码率表达式,然后评估了无条件误码率。该方法也被推广到估计具有多个接收天线的系统的误码率性能。采用选择法和最大比组合(MRC)方法作为分集组合方案,发现两种方案的误码率提高几乎相同。此外,将卷积信道编码应用于DS-CDMA系统中,并注意到它可以提供更多的系统性能增强。
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引用次数: 3
Design and analysis of online testability of reversible sequential circuits 可逆顺序电路在线可测试性的设计与分析
Pub Date : 2009-12-01 DOI: 10.1109/ICCIT.2009.5407143
Moshaddek Hasan, A. Islam, A. Chowdhury
Reversible logic plays an important role in the synthesis of circuits having application in quantum computing, low power CMOS design and nanotechnology-based system. In this paper, we have proposed the online testability of reversible sequential circuits, which is first ever proposed in literature. On the way to propose the online testability of reversible sequential circuits, we have proposed an improved Rail-check circuit that significantly improves the performance of the overall circuit in terms of gate cost and garbage cost parameters. We have also used our improved and efficient rail-check circuit to realize the testability of different benchmark circuits.
可逆逻辑在量子计算、低功耗CMOS设计和基于纳米技术的系统的电路合成中起着重要作用。本文首次在文献中提出了可逆顺序电路的在线可测试性。在提出可逆顺序电路在线可测试性的过程中,我们提出了一种改进的Rail-check电路,该电路在栅极成本和垃圾成本参数方面显著提高了整个电路的性能。我们还利用改进后的高效轨检电路实现了不同基准电路的可测试性。
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引用次数: 22
Offshore-outsourced software development risk management model 离岸外包软件开发风险管理模型
Pub Date : 2009-12-01 DOI: 10.1109/ICCIT.2009.5407292
Shareeful Islam, S. Houmb, Daniel Mendez-Fernandez, Md. Mahbubul Alam Joarder
Offshore-outsourced software development is gaining popularity because companies are continuously forced to reduce production costs while keeping sustainable competitive strength. However, this trend of software development increases projects' complexity and brings up risks to the overall project environment. Therefore, risks of offshore software development require to be managed as early as possible for a successful project. This paper considers a risk management model from a holistic perspective to manage offshore software development risk, integrated into early stages of development. The approach effectively identifies and specifies the goals of a project and the related risk factors. This is done at the basis of selected software development components within the running project. We show how to trace and control these risks already during early requirements engineering activities. The model at hand is implemented into an ongoing offshore software development project to (1) identify goals and risk factors from the local context and finally (2) to determine its applicability of the approach in offshore software development projects from a vendor's perspective.
离岸外包软件开发越来越受欢迎,因为公司不断被迫降低生产成本,同时保持可持续的竞争优势。然而,软件开发的这种趋势增加了项目的复杂性,并给整个项目环境带来了风险。因此,为了一个成功的项目,离岸软件开发的风险需要尽可能早地进行管理。本文从整体的角度考虑风险管理模型来管理离岸软件开发风险,并将其集成到开发的早期阶段。该方法有效地识别和指定了项目的目标和相关的风险因素。这是在运行项目中选择的软件开发组件的基础上完成的。我们展示了如何在早期需求工程活动中跟踪和控制这些风险。将手边的模型实现到正在进行的离岸软件开发项目中,以(1)从本地环境中确定目标和风险因素,最后(2)从供应商的角度确定其方法在离岸软件开发项目中的适用性。
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引用次数: 18
OSDT: Outer Shape Detection Technique for Recognition of Bangla Optical Character 面向孟加拉语光学字符识别的外形检测技术
Pub Date : 2009-12-01 DOI: 10.1109/ICCIT.2009.5407268
Md. Al Imran, J. Hossain, T. Dey, B. K. Debroy, Ahsan Habib Abir
Optical Character Recognition is one of the challenging fields in recognition of printed Bangla text. The main difficulties are that there are no precise techniques or algorithms for separating lines, words, and characters from printed Bangla text and efficiently recognize these separate characters. In this paper, we introduce new methods to separate lines, words, and characters from printed Bangla text. We also propose Outer Shape Detection Technique (OSDT), a new technique to recognize each character based on its outer shape which is unique. To successfully accomplish this, proposed technique scans each character both from its left side and right side. Finally our experimental results are compared with some prevalent ones which precisely show that our approach performs smoothly on different font sizes and number of characters.
光学字符识别是孟加拉文印刷文本识别的难点之一。主要的困难是没有精确的技术或算法来从印刷的孟加拉文本中分离行、词和字符,并有效地识别这些单独的字符。在本文中,我们介绍了从印刷孟加拉文本中分离行、词和字符的新方法。我们还提出了一种基于字符外部形状的识别新技术——外部形状检测技术(OSDT)。为了成功地做到这一点,所提出的技术从每个字符的左侧和右侧扫描。最后,将我们的实验结果与一些流行的实验结果进行了比较,准确地表明我们的方法在不同的字体大小和字符数下都能很好地执行。
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引用次数: 2
Performance study and simulation analysis of CSMA and IEEE 802.11 in wireless sensor networks and limitations of IEEE 802.11 CSMA和IEEE 802.11在无线传感器网络中的性能研究与仿真分析以及IEEE 802.11的局限性
Pub Date : 2009-12-01 DOI: 10.1109/ICCIT.2009.5407277
S. Chowdhury, Mohamamd Tauhidul Islam, Fariha Tasmin Jaigirdar, Md. Rokan Uddin Faruqui, S. Noor
Since its birth wireless communication became an indispensible part of the modern society. One major area that has a gigantic impact on the performance of wireless sensor networks (WSNs) is the Medium Access Control (MAC) layer. Many random access protocols exist in wireless sensor networks. Some of these protocols include Carrier Sense Multiple Access (CSMA), Multiple Access with Collision Avoidance (MACA), Multiple Access with Collision Avoidance for wireless (MACAW) and IEEE 802.11. All the protocols mentioned above except CSMA use Request To Send/Clear To Send (RTS/CTS) packets to avoid collisions (hidden terminal problem) which was a great problem for CSMA and that is the reason CSMA is almost obsolete for wireless communications. But after using RTS/CTS packets the protocols have to encounter some extra problems such as, energy consumption and end-to-end delay. The objective of this paper is to show the pros and cons of using RTS/CTS packets by comparing CSMA (does not use RTS/CTS) and IEEE 802.11 (uses RTS/CTS packets). We also portray that under some specific scenario the IEEE 802.11 is outperformed by CSMA which is also the novelty and contribution of this research work. This observation suggests that a lot of works have to be done to consider IEEE 802.11 an approximate perfect MAC layer protocol for WSNs.
无线通信自诞生之日起就成为现代社会不可或缺的一部分。介质访问控制(MAC)层是影响无线传感器网络(wsn)性能的一个重要方面。无线传感器网络中存在多种随机接入协议。其中一些协议包括载波感知多址(CSMA)、防碰撞多址(MACA)、无线防碰撞多址(MACAW)和IEEE 802.11。除了CSMA之外,上述所有协议都使用请求发送/清除发送(RTS/CTS)数据包来避免冲突(隐藏终端问题),这是CSMA的一个大问题,这也是CSMA在无线通信中几乎过时的原因。但是在使用了RTS/CTS包之后,协议会遇到一些额外的问题,比如能耗和端到端延迟。本文的目的是通过比较CSMA(不使用RTS/CTS)和IEEE 802.11(使用RTS/CTS数据包)来展示使用RTS/CTS数据包的利弊。我们还描述了在某些特定场景下,IEEE 802.11的性能优于CSMA,这也是本研究工作的新颖性和贡献。这一观察结果表明,要将IEEE 802.11视为wsn的近乎完美的MAC层协议,还有很多工作要做。
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引用次数: 13
期刊
2009 12th International Conference on Computers and Information Technology
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