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2011 IEEE Symposium on Computers & Informatics最新文献

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Requirement engineering techniques in developing expert systems 开发专家系统的需求工程技术
Pub Date : 2011-03-20 DOI: 10.1109/ISCI.2011.5958991
J. Ang, Sook Bing Leong, Chin Fei Lee, U. K. Yusof
Expert system has the least focus on requirement engineering. In facts, requirement engineering is important to get all the requirements needed for an expert system. If the requirements do not meet the clients' needs, the expert system is considered fail although it works perfectly. Currently, there are a lot of studies proposing and describing the development of expert systems. However, they are focusing in a specific and narrow domain of problems. Also, the major concern of most researchers is the design issues of the expert system. Therefore, we emphasize on the very first step of success expert system development — requirement engineering. Hence, we are focusing in the requirement engineering techniques in order to present the most practical way to facilitate requirement engineering processes. In this paper, we analyze expert system attributes, requirement engineering processes in expert system developments and the possible techniques that can be applied to expert system developments. Next, we propose the most appropriate techniques for the expert system developments based on the analysis. From this paper, a set of techniques for expert system development will be provided.
专家系统对需求工程的关注最少。事实上,需求工程对于获得专家系统所需的所有需求非常重要。如果需求不满足客户的需求,专家系统被认为是失败的,尽管它工作得很好。目前,有很多研究提出并描述了专家系统的发展。然而,他们关注的是一个特定的、狭窄的问题领域。同时,专家系统的设计问题也是大多数研究者关注的主要问题。因此,我们强调成功的专家系统开发的第一步——需求工程。因此,我们将重点放在需求工程技术上,以便提供最实用的方法来促进需求工程过程。在本文中,我们分析了专家系统的属性、专家系统开发中的需求工程过程以及可能应用于专家系统开发的技术。接下来,我们在分析的基础上提出了最适合专家系统开发的技术。本文将提供一套专家系统开发技术。
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引用次数: 25
Video transmission over WiMedia-UWB using subpacket hybrid ARQ 使用子分组混合ARQ的WiMedia-UWB视频传输
Pub Date : 2011-03-20 DOI: 10.1109/ISCI.2011.5958957
Gek Hong Sim, Yoong Choon Chang, T. Chuah
Ultra-wideband (UWB) serves the high bandwidth demand for high definition video transmission over short-range wireless networks. Nevertheless, bursty errors due to harsh channel conditions during video transmission greatly deteriorate video quality. In order to improve the quality of video transmission over UWB, we propose the use of a subpacket based hybrid automatic repeat request (HARQ) scheme instead of the conventional packet based HARQ scheme. The proposed subpacket based HARQ scheme only retransmits erroneous subpackets and avoids retransmission of other correctly decoded subpackets. Simulation results show that in comparison with the conventional packet based HARQ scheme, the proposed subpacket based HARQ scheme achieves significant performance improvement in terms of delay, percentage of overhead, throughput and reconstructed video quality.
超宽带(UWB)满足了在短距离无线网络上高清视频传输的高带宽需求。然而,在视频传输过程中,由于恶劣的信道条件导致的突发错误极大地降低了视频质量。为了提高UWB视频传输的质量,我们提出了一种基于子分组的混合自动重复请求(HARQ)方案来代替传统的基于分组的HARQ方案。提出的基于子包的HARQ方案只重传错误的子包,避免重传其他正确解码的子包。仿真结果表明,与传统的基于分组的HARQ方案相比,所提出的基于子分组的HARQ方案在时延、开销百分比、吞吐量和重构视频质量等方面都取得了显著的性能提升。
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引用次数: 0
Traffic sign recognition model on mobile device 移动设备上的交通标志识别模型
Pub Date : 2011-03-20 DOI: 10.1109/ISCI.2011.5958925
W. H. Ling, Woo Chaw Seng
Incorporation of a good machine vision into mobile device can create a powerful application. With such advancement, mobile users can use their existing smartphone as their third-eye to perceive the world. This paper introduces a framework using the smartphone to increase ambient intelligence and road safety of moving vehicles through traffic sign alert application. The driver is alerted of the incoming traffic signs in different modes depending on the user's preference. However, the competency of the application is still bounded with the capability of a normal human vision. Unlike conventional research work, this paper emphasizes on portability and expandability. Portability means there is no additional installation or placement of electronic hardware required in the vehicle in order to make the system work. Expandability focuses on the transparency of the traffic sign recognition output to other applications within same hardware device or external devices. This provides an option to other developers to use or expand their own applications by using the result of the proposed application. An interaction model of the traffic sign recognition system on mobile device is introduced.
将良好的机器视觉整合到移动设备中可以创建强大的应用程序。有了这样的进步,移动用户可以用他们现有的智能手机作为他们感知世界的第三只眼睛。本文介绍了一种利用智能手机通过交通标志报警应用来提高环境智能和移动车辆道路安全的框架。根据用户的偏好,驾驶员会在不同的模式下收到交通信号的警报。然而,应用程序的能力仍然受到正常人类视觉能力的限制。与传统的研究工作不同,本文强调可移植性和可扩展性。可移植性意味着不需要在车辆中安装或放置电子硬件,以使系统工作。可扩展性侧重于交通标志识别输出到同一硬件设备或外部设备内的其他应用程序的透明度。这为其他开发人员提供了一个选择,可以使用建议的应用程序的结果来使用或扩展他们自己的应用程序。介绍了移动设备上交通标志识别系统的交互模型。
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引用次数: 8
Robust combining methods in committee neural networks 委员会神经网络的鲁棒组合方法
Pub Date : 2011-03-20 DOI: 10.1109/ISCI.2011.5958876
S. A. Jafari, S. Mashohor
Combining a set of suitable experts can improve the generalization performance of the group when compared to single experts alone. The classical problem in this area is to answer the question about how to combine the ensemble members or the individuals. Different methods for combining the outputs of the experts in a committee machine (ensemble) are reported in the literature. The popular method to determine the error in every prediction is Mean Square Error (MSE), which is heavily influenced by outliers that can be found in many real data such as geosciences data. In this paper we introduce Robust Committee Neural Networks (RCNNs). Our proposed approach is the Huber and Bisquare function to determine the error between measured and predicted value which is less influenced by outliers. Therefore, we have used a Genetic Algorithm (GA) method to combine the individuals with the Huber and Bisquare as the fitness functions. The results show that the Root Mean Square Error (RMSE) and R-square values for these two functions are improved compared to the MSE as the fitness function and the proposed combiner outperformed other five existing training algorithms.
与单个专家相比,组合一组合适的专家可以提高群体的泛化性能。该领域的经典问题是回答如何将整体成员或个体结合起来的问题。文献中报道了将专家的输出组合在委员会机(集成)中的不同方法。确定每种预测误差的常用方法是均方误差(MSE),它受到许多实际数据(如地球科学数据)中存在的异常值的严重影响。本文介绍了鲁棒委员会神经网络(rcnn)。我们提出的方法是Huber和bissquared函数来确定测量值与预测值之间的误差,该方法受异常值的影响较小。因此,我们使用遗传算法(GA)方法将个体与Huber和bissquared作为适应度函数组合在一起。结果表明,这两个函数的均方根误差(RMSE)和r平方值与作为适应度函数的均方根误差(MSE)相比得到了改善,并且所提出的组合优于其他五种现有的训练算法。
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引用次数: 3
Performance of real time cooperative MIMO using an SDR platform 基于SDR平台的实时协同MIMO性能研究
Pub Date : 2011-03-20 DOI: 10.1109/ISCI.2011.5958956
Hassaan Ajaz, Omer Ihsan, Usman Javed, Moaaz Ali Hafeez, A. Khan, S. Irteza
Fading remains the prime problem in wireless communications, and line of sight communication is not possible everywhere. Multiple Input Multiple Output (MIMO) is a technique used to mitigate multi path fading effects by physically placing multiple antennas to create independent channel realizations. Cooperative MIMO on the other hand generates the effect of MIMO through cooperation of distributed radio nodes within the network. The paper identifies performance gains achieved in terms of frame error rate versus average signal to noise ratio of cooperative communication networks over conventional SISO and multiple collocated antenna array systems. An experimental testbed is developed on a Software Defined Radio (SDR) platform comprising of three distributed network nodes operating in the 2.4GHz unlicensed ISM band. A Selective Decode and Forward (DF) cooperative protocol is developed and established between the nodes. The results have been evaluated in terms of diversity gains as measured from the experimental curves of FER versus average SNR. A comparative analysis reflects that at a fixed value of SNR the FER of CMIMO communication systems is less than SISO, SIMO and single antenna cooperation networks.
衰落仍然是无线通信的主要问题,而且并非在任何地方都能实现视距通信。多输入多输出(MIMO)是一种用于减轻多径衰落效应的技术,通过物理放置多个天线来创建独立的信道实现。而协作式MIMO则是通过网络内分布式无线节点的协作来产生MIMO的效果。本文确定了在传统SISO和多个并置天线阵列系统的协作通信网络的帧错误率与平均信噪比方面实现的性能增益。在软件定义无线电(SDR)平台上开发了一个实验测试平台,该平台由三个分布式网络节点组成,工作在2.4GHz免许可ISM频段。开发并建立了节点间的选择性解码转发(DF)合作协议。结果已被评估的多样性增益,测量从实验曲线与平均信噪比。对比分析表明,在信噪比一定的情况下,CMIMO通信系统的误码率小于SISO、SIMO和单天线合作网络。
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引用次数: 1
Evaluation of RASTA approach with modified parameters for speech enhancement in communication systems 改进参数的RASTA方法在通信系统语音增强中的评价
Pub Date : 2011-03-20 DOI: 10.1109/ISCI.2011.5958902
Satish K. Shah, J. Shah, N. Parmar
The purpose of speech enhancement techniques is to improve quality and intelligibility of speech without producing any artifact. The speech enhancement algorithms are designed to suppress additive background noise and convolutive distortion or reverberation. The need for enhancement of noisy speech in communication systems increases with the spread of mobile and cellular telephony. Calls may originate from noisy environments such as moving vehicles or crowded public gathering places. The corrupting noise is not always white rather it is colored and contains reverberation. The currently employed noise suppressors in communication systems use spectral subtraction based on short time spectral attenuation (STSA) algorithms as a preprocessor in speech coder. They can perform well in white noise condition but failed in real colored noise environments with different SNRs. This leads to the use of RelAtive SpecTrAl (RASTA) algorithm for speech enhancement which was originally designed to alleviate effects of convolutional and additive noise in automatic speech recognition (ASR). RASTA does this by band-pass filtering time trajectories of parametric representations of speech in the domain in which the disturbing noisy components are additive. This paper evaluates the performance of RASTA algorithm for white and colored noise reduction as well as suggests modifications in parameters and filtering approach to perform quite well than original RASTA approach. The NOIZEUS database is used for objective evaluation in different noise conditions with 0 to 10dB SNRs. The results shown here give improvements compared to spectral subtraction methods.
语音增强技术的目的是在不产生任何伪影的情况下提高语音的质量和可理解性。语音增强算法旨在抑制加性背景噪声和卷积失真或混响。随着移动电话和蜂窝电话的普及,对通信系统中噪声语音增强的需求也在增加。呼叫可能来自嘈杂的环境,如移动的车辆或拥挤的公共场所。破坏性的噪声并不总是白色的,而是有颜色的,并且包含混响。目前通信系统中常用的噪声抑制器都是基于短时频谱衰减(STSA)算法的频谱减法作为语音编码器的预处理器。它们在白噪声环境下表现良好,但在不同信噪比的彩色噪声环境下表现不佳。这导致使用相对频谱(RASTA)算法进行语音增强,该算法最初设计用于减轻自动语音识别(ASR)中卷积和加性噪声的影响。RASTA通过带通滤波在干扰噪声成分为加性的域内语音参数表示的时间轨迹来实现这一点。本文评价了RASTA算法在白噪声和彩色噪声降噪方面的性能,并对参数和滤波方法进行了修改,使其性能优于原来的RASTA算法。NOIZEUS数据库用于在0 ~ 10dB信噪比的不同噪声条件下进行客观评价。这里显示的结果与光谱减法方法相比有了改进。
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引用次数: 5
Dynamic candidate keypad for stroke-based Chinese input method on touchscreen devices 基于笔画的中文输入法在触摸屏设备上的动态候选键盘
Pub Date : 2011-03-20 DOI: 10.1109/ISCI.2011.5958900
L. Po, C. K. Wong, C. Ting, K. Ng, K. Wong, C. Cheung, K. Cheung
With the popularity of touchscreen devices, physical button-based keyboards are being replaced by finger-operated virtual keyboards. Entering text on these touchscreen devices is no longer limited by finger tapping activities on the keys. Text input can be performed by finger sliding over the virtual keyboard, which is well realized by the Swype technology on a typical QWERTY keyboard. Such shorthand gesturing for text input, however, may be inefficient when directly applied to Chinese input, especially in Chinese stroke-based input method. In this paper, a novel dynamic candidate keypad with use of unidirectional finger gesture on the stroke key for character selection is proposed for enhancing stroke-based Chinese input method. The new design can enhance frequently used Chinese characters searching and input using stroke-based input. The new method is implemented on the Android 2.2 platform for performance evaluation using Traditional Chinese characters set. Experimental results show that the proposed method enables users to input popular Chinese characters easier than conventional stroke-based input methods.
随着触摸屏设备的普及,基于按钮的物理键盘正在被手指操作的虚拟键盘所取代。在这些触屏设备上输入文本不再受手指敲击键盘活动的限制。文本输入可以通过手指在虚拟键盘上滑动来实现,这在典型的QWERTY键盘上通过Swype技术很好地实现了。然而,当直接应用于中文输入法,尤其是基于中文笔画的输入法时,这种简写手势的效率可能会很低。为了增强基于笔划的中文输入法,提出了一种新的动态候选键盘,在笔划键上使用单向手指手势进行字符选择。新的设计可以增强常用汉字的搜索和基于笔画的输入。在Android 2.2平台上实现了基于繁体中文字符集的性能评价方法。实验结果表明,该方法比传统的基于笔画的输入法更容易输入流行汉字。
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引用次数: 5
Emerging computational strategy for eradication of malaria 消灭疟疾的新兴计算策略
Pub Date : 2011-03-20 DOI: 10.1109/ISCI.2011.5959005
M. Eze, J. Labadin, Terrin Lim
Even with a lot of efforts by researchers, malaria eradication is yet to become a reality. The link between malaria infected and non-infected human beings, which led to transmission of the disease, is bridged by infected malaria vectors, through blood sucking bites. Such bites take place either in residential homes or public places. Suppose the residential homes are placed under reliable vector control, malaria transmission will still persist unless the public places are taken into consideration. The emerging computational strategy is about leveraging on the interactions between human beings and mosquitoes in public places to build realistic network models with the ultimate aim of applying relevant search techniques to such models, so as to determine the public places which act as reservoir of infected malaria vectors. The overall result will form a key resource for realistic vector control. Hence the idea is to be more proactive and offensive against malaria vectors, by locating the vectors in their hiding places, rather than human beings being located and bitten by the infected vectors. The emerging computational strategy discussed here is part of an ongoing research project in application of computational techniques towards eradication of malaria. This paper documents the result of an initial survey on malaria vector existence in public places.
即使研究人员付出了很多努力,根除疟疾仍未成为现实。受疟疾感染的人和未受疟疾感染的人之间的联系导致了疾病的传播,而受感染的疟疾病媒通过吸血叮咬架起了桥梁。这种叮咬发生在住宅或公共场所。即使住宅受到可靠的病媒控制,除非考虑到公共场所,否则疟疾传播仍将持续存在。新兴的计算策略是利用公共场所人与蚊子之间的相互作用,建立现实的网络模型,最终目的是将相关搜索技术应用于这些模型,从而确定公共场所作为感染疟疾媒介的储存库。整体结果将形成现实的矢量控制的关键资源。因此,我们的想法是更积极主动地打击疟疾病媒,将病媒定位到它们的藏身之处,而不是让人类被感染的病媒定位和叮咬。这里讨论的新兴计算战略是正在进行的应用计算技术消灭疟疾研究项目的一部分。本文报道了对公共场所疟疾媒介存在情况的初步调查结果。
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引用次数: 3
A modified planar monopole antenna for UWB applications 一种用于超宽带应用的改进平面单极天线
Pub Date : 2011-03-20 DOI: 10.1109/ISCI.2011.5958903
Y. Zehforoosh, Ramazanali Sadegzadeh, N. MirMotahhary
In this paper, we present a novel design of printed monopole antenna for UWB applications. The radiating element of the proposed antenna is composed of an octagonal patch fed by a 50 ohm microstrip. It has a very compact size of 20mm×12mm, which can be integrated easily with other RF front-end circuits. The antenna parameters and performances have been investigated through a large amount of EM simulations. It has been demonstrated that the proposed antenna provides an ultra wide bandwidth from 2.95 GHz to 13.35 GHz, completely covering the range set by the Federal Communication Commission (FCC) for UWB operations (3.1GHz to 10.6GHz). It also enjoys advantages such as low profile, low cost, high gain and satisfactory radiation characteristics.
本文提出了一种用于超宽带应用的印刷单极天线的新设计。所述天线的辐射元件由由50欧姆微带馈电的八角形贴片组成。它有一个非常紧凑的尺寸20mm×12mm,可以很容易地与其他射频前端电路集成。通过大量的电磁仿真研究了天线的参数和性能。实验证明,该天线提供2.95 GHz至13.35 GHz的超宽带带宽,完全覆盖了美国联邦通信委员会(FCC)为超宽带业务(3.1GHz至10.6GHz)设定的范围。它还具有外形小、成本低、增益高、辐射特性好等优点。
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引用次数: 3
A-class: A classroom software with the support for diversity in aptitudes of autistic children A-class:支持自闭症儿童不同能力的课堂软件
Pub Date : 2011-03-20 DOI: 10.1109/ISCI.2011.5959007
M. R. Rahman, Shujon Naha, P. Roy, Ishrat Ahmed, Samiha Samrose, Md. Mahmudur Rahman, S. I. Ahmed
The burgeoning growth of the e-Learning technologies implies the fact that the future education system will largely depend upon the electronic devices and computer aided technologies. It has already been proved that the computer aided teaching techniques are much more effective for the children than the traditional teaching system in most of the cases. A large number of software has been designed to assist the teachers in the classroom to teach and evaluate the students. Although those software systems are good enough for a class with normal (neurotypical) children, those very often fail to address the special needs of the autistic children. Hence, the autistic children face various challenges in participating with neurotypicals in the same classroom. We have addressed this problem by designing and implementing an intelligent classroom software, named “A-Class”, which takes care of the diversity of tastes among the autistic children of a classroom and helps the teacher to teach in a class participated by both autistic and neurotypical children. In this paper we discuss the idea, design and implementation of A-Class based upon our five months of intervention with the autistic children at Autism Welfare Foundation (AWF) in Dhaka.
电子学习技术的迅猛发展意味着未来的教育系统将在很大程度上依赖于电子设备和计算机辅助技术。事实证明,在大多数情况下,计算机辅助教学技术比传统的教学系统更有效。大量的软件被设计出来帮助教师在课堂上进行教学和评价学生。尽管这些软件系统对于正常(神经典型)儿童的班级来说已经足够好了,但它们往往不能满足自闭症儿童的特殊需求。因此,自闭症儿童在与神经正常的人在同一个教室里学习时面临着各种各样的挑战。为了解决这个问题,我们设计并实现了一款名为“a - class”的智能课堂软件,它可以照顾到教室里自闭症儿童的不同口味,并帮助老师在自闭症儿童和正常儿童都参加的课堂上授课。本文通过对达卡自闭症福利基金会(Autism Welfare Foundation, AWF)的自闭症儿童进行为期五个月的干预,讨论了a类课程的理念、设计和实施。
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引用次数: 16
期刊
2011 IEEE Symposium on Computers & Informatics
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