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2013 10th International Conference on Electrical Engineering/Electronics, Computer, Telecommunications and Information Technology最新文献

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CPW-fed dual wideband using stub split-ring rectangular slot antenna 采用短节分环矩形槽天线的cpw馈电双宽带
S. Pimpol, R. Wongsan
This paper presents the design and experimental of dual wideband coplanar waveguide (CPW)-fed using stub split-ring rectangular slot antenna operates in WLAN applications. This antenna is designed for dual frequency used in WLAN system coverage IEEE 802.11b/g (2.4-2.4835 GHz) and IEEE 802.11a (5.15-5.35 GHz). The results of the return loss (S11), gain and radiation pattern of the proposed antenna have been simulated by using antenna analysis software IE3D program. The transmission line and ground plane have been designed to be on the same plane with antenna slot to be applicable for wideband operation. It is found that the proposed antenna is accessible to bandwidth about 40% and 15.47% at frequency range 2-3 GHz and 4.71-5.5 GHz, respectively. Measured maximum gains were approximately 6.74 dBi and 7.01 dBi for 2.45 GHz, 5.2 GHz band, respectively. Finally, simulation and measurement results for the design example are presented and a conclusion follows.
本文介绍了一种基于短段分环矩形缝隙天线的双宽带共面波导馈电系统的设计与实验。该天线设计用于WLAN系统覆盖IEEE 802.11b/g (2.4-2.4835 GHz)和IEEE 802.11a (5.15-5.35 GHz)的双频。利用IE3D天线分析软件对天线的回波损耗(S11)、增益和辐射方向图进行了仿真。传输线和地平面设计为与天线槽在同一平面上,以适应宽带运行。结果表明,该天线在2-3 GHz和4.71-5.5 GHz频段分别可获得约40%和15.47%的带宽。在2.45 GHz和5.2 GHz频段测得的最大增益分别约为6.74 dBi和7.01 dBi。最后给出了设计实例的仿真和测量结果,并得出了结论。
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引用次数: 7
A comparative study on different techniques for Thai part-of-speech tagging 泰语词性标注技术的比较研究
J. Pailai, R. Kongkachandra, T. Supnithi, P. Boonkwan
The natural language processing (NLP) for Thai language is rather complicated using in the real tasks because it has a complex sequential structure of the sentence. The POS tagging can improve the accuracy of syntactic analysis so it can support the improvement of many NLP tasks. We present the supervised machine learning that is suitable for annotate the POS type for Thai language by comparison between the Support Vector Machine (SVM) and the Conditional Random Fields (CRFs). The BEST 2012 News and Entertainments corpus is utilized in our experiments. However, the sequential characteristic of Thai language is the interesting point and we use it as our feature in training set. Our sequential features contain forward 3-gram, backward 3-gram and 5-gram. The best accuracy of our experiments is 93.638% from SVMs POS tagging that learning by word of forward 3-gram when the size of training data is ten thousand tokens. Moreover, with the same training data, the best accuracy of CRFs is very close with SVM that is 93.254% when the learning form is the word with POS of 5-gram.
泰语的自然语言处理(NLP)在实际任务中的应用相当复杂,因为它具有复杂的句子顺序结构。词性标注可以提高句法分析的准确性,从而支持许多自然语言处理任务的改进。通过对支持向量机(SVM)和条件随机场(CRFs)的比较,提出了一种适用于泰语POS类型标注的监督式机器学习方法。我们的实验使用BEST 2012新闻和娱乐语料库。然而,泰语的顺序特征是一个有趣的点,我们将其作为训练集的特征。我们的顺序特征包括向前3克,向后3克和5克。当训练数据的大小为10000个token时,使用前向3克单词学习的svm进行POS标注,实验的最佳准确率为93.638%。此外,在相同的训练数据下,当学习形式为POS为5克的单词时,CRFs的最佳准确率为93.254%,与SVM非常接近。
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引用次数: 9
Aggregating method of induction motor group using energy conservation law 基于能量守恒定律的感应电机群聚集方法
P. Aree
This paper proposes a simple method for aggregating a group of induction motors, which are connected at the same bus. The parameters of aggregate motor are derived using a technique based on energy conservation law. An accuracy of the aggregate model of multiple motors is verified by comparing dynamic responses obtained from the sum of individual motor and the aggregate motor. The obtained results are satisfactory.
本文提出了一种将一组连接在同一母线上的感应电动机进行聚合的简单方法。采用基于能量守恒定律的方法推导了集散电动机的参数。通过比较单个电机和总体电机的动态响应,验证了多电机聚合模型的准确性。所得结果令人满意。
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引用次数: 5
Variable block-size based fractal coding for multi-view video coding 基于可变块大小的分形编码用于多视点视频编码
Narasak Boonthep, W. Chiracharit, K. Chamnongthai
Multi-view video consists of a set of multiple video sequences from multiple viewpoints or view directions in the same scene. It contains extremely a large amount of data and some extra information to be stored or transmitted to the user and computational complexity of processing. This paper proposes fast disparity and motion estimation for reduce complexity, to solve the redundancy reduction problem by considering the information of regions, and set up priority among region based on information in the pre-processing. The proposed method makes some changes to the conventional fractal-based video coding method which vary block partition depends on priory region. Experimental results show that the proposed method can reduce the encoding time, so that the encoder complexity can be reduced but achieves almost the same compression quality. The encoding time is reduced up to 25.4%.
多视点视频由同一场景中多个视点或视点方向的多个视频序列组成。它包含了极其大量的数据和一些额外的信息,需要存储或传输给用户和计算处理的复杂性。为了降低复杂度,本文提出了快速视差和运动估计,通过考虑区域信息来解决冗余削减问题,并在预处理过程中根据信息设置区域间的优先级。该方法在一定程度上改变了传统的基于分形的视频编码方法中基于优先区域的块划分。实验结果表明,该方法可以减少编码时间,从而降低编码器的复杂度,同时获得几乎相同的压缩质量。编码时间最多减少25.4%。
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引用次数: 3
Agent based task specific team formation for effective distributed decision making 基于Agent的任务特定团队形成,实现有效的分布式决策
Arambam James Singh, S. Acharya, Animesh Dutta
Getting solution of a problem by group discussion is more reliable than getting solution from a single entity. To increase reliability of the solution, efficient group of experts should be formed. Here in this paper we have proposed a methodology for finding efficient team of experts for solution of a given problem collaboratively. The methodology is conceptualized with the notion of Multiagent system. We have considered several factors like Cardinality of team, ability, willingness, trust and reciprocality of an agent in order to construct the team. We have also proposed an optimization function which will be used to choose most eligible agents to form the team of experts.
通过小组讨论获得问题的解决方案比从单个实体获得解决方案更可靠。为了提高解决方案的可靠性,需要组建一个高效的专家小组。在本文中,我们提出了一种寻找有效的专家团队来协作解决给定问题的方法。该方法采用了多智能体系统的概念。为了构建团队,我们考虑了团队的基数、能力、意愿、信任和相互性等因素。我们还提出了一个优化函数,该函数将用于选择最合适的代理来组成专家团队。
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引用次数: 1
Investigation of small electrical resistance of NiTi shape memory alloys in the application of damage detection NiTi形状记忆合金小电阻在损伤检测中的应用研究
Chatchai Chatwaranon, S. Wongsa, Taywin Buasri, A. Khantachawana
Applications of shape memory alloys (SMAs) as damage sensors have been widely studied in structural health monitoring. Monitoring a significant change in electrical resistance of SMAs can indicate the phase transformation of SMAs. The possibility of using the electrical resistance of SMAs as an indicator of damage in the materials has been investigated. We continuously monitored the behaviour of electrical resistance, as well as the strain, under the tensile test which is used as the simulated crack propagation. Wavelet transform were used to extract the trend of the noisy electrical resistance raw data, measured by the four-point-probe technique. We determined that the electrical resistance variation of the SMA wire is correlated with the strain and can possibly be used in damage detection stage.
形状记忆合金作为损伤传感器在结构健康监测中的应用得到了广泛的研究。监测sma电阻的显著变化可以指示sma的相变。研究了用sma的电阻作为材料损伤指标的可能性。我们连续监测电阻的行为,以及应变,在拉伸试验中被用作模拟裂纹扩展。利用小波变换提取四点探针法测量的带噪电阻原始数据的变化趋势。我们确定了SMA丝的电阻变化与应变相关,可以用于损伤检测阶段。
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引用次数: 4
Hardware amount evaluation of the improved WEP on an FPGA 改进的WEP在FPGA上的硬件量评估
Tomoaki Sato, P. Moungnoul
The spread of smart phones means the traffic capacity stringent of mobile communications. One way of solving the problem of traffic capacity is the use of a Wi-Fi hotspot. The majority of Wi-Fi hotspots are used WEP (Wired Equivalent Privacy) as a cipher. Nevertheless, the method of deciphering WEP has already been clarified. Some deciphering programs can execute deciphering of WEP in several seconds. To solve this problem, an improved WEP has been proposed. The features of the improved WEP are a compatible algorithm with WEP and strengthening of cipher strength. The improved WEP algorithm has been evaluated only on software and has not been implemented on hardware. On the other hand, ciphers for a WiFi LAN are implemented on an FPGA (Field-Programmable Gate Array) as well as a system LSI and is used in various devices. Additionally, it is important that the size of the processing unit is small. In this paper, the improved WEP is implemented on an FPGA. Then, the number of elements and registers of the improved WEP is compared with that of a conventional WEP. As a result, it is shown that hardware amount of the improved WEP hardly increases. Besides, it is proposed that a method to increase the cipher strength of the improved WEP by utilizing the characteristics of an FPGA and wave-pipelining.
智能手机的普及意味着移动通信的流量容量紧张。解决流量问题的一种方法是使用Wi-Fi热点。大多数Wi-Fi热点使用WEP(有线等效隐私)作为密码。然而,破译WEP的方法已经被阐明。一些解密程序可以在几秒钟内完成WEP的解密。为了解决这一问题,提出了一种改进的WEP。改进的WEP算法具有与WEP兼容和增强密码强度的特点。改进的WEP算法仅在软件上进行了评估,尚未在硬件上实现。另一方面,用于WiFi局域网的密码是在FPGA(现场可编程门阵列)以及系统LSI上实现的,并用于各种设备。此外,处理单元的尺寸要小,这一点很重要。本文在FPGA上实现了改进的WEP。然后,将改进的WEP的单元数和寄存器数与传统WEP进行了比较。结果表明,改进后的WEP的硬件数量几乎没有增加。此外,还提出了一种利用FPGA和波管道的特性来提高改进后的WEP密码强度的方法。
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引用次数: 0
Design of fractional conversion ratio SC DC-DC converters 分数转换比SC DC-DC转换器的设计
S. Pongswatd, Krit Smerpituk, P. Julsereewong, K. Eguchi, H. Sasaki
This paper presents the switched-capacitor (SC) circuit structure whose design conversion ratio is fraction multiple. The proposed converters can step up or step down the input voltage and bidirectional power flow by using dual converters connected. The 2x and 1/2x fraction conversion ratio is specified as a case study. The characteristics of the proposed converters are clarified by theoretical analyses. In addition, the simulation and experimental show the validity of circuit design, where theoretical results correspond well with simulation and experimental results. The proposed converters will be useful for battery charger, battery equalizer and dc power transfer.
介绍了一种设计转换率为分数倍的开关电容(SC)电路结构。所提出的变换器可以通过连接双变换器来升压或降压输入电压和双向潮流。2x和1/2x分数转换比率被指定为案例研究。通过理论分析,阐明了所提变流器的特点。仿真和实验验证了电路设计的有效性,理论结果与仿真和实验结果吻合较好。所提出的转换器将用于电池充电器,电池均衡器和直流电源传输。
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引用次数: 5
A novel resonant LLC soft-switching inverting-buck converter 一种新型谐振LLC软开关反压变换器
M. Jabbari, Nahid Hematian Najafabadi, G. Shahgholian, M. Mahdavian
A new soft-switching resonant inverting-buck converter with high efficiency is presented. The proposed converter steps down and inverts the input voltage. The zero-current-switching (ZCS) technique is employed to reduce switching losses and Electromagnetic Interferences (EMI). An LLC resonant network is utilized to provide soft-switching conditions for all semiconductor devices. Experimental results verify the integrity of the proposed converter operation and the presented theoretical analysis.
提出了一种新型高效软开关谐振反压变换器。所提出的变换器降压并反相输入电压。零电流开关(ZCS)技术用于降低开关损耗和电磁干扰(EMI)。利用LLC谐振网络为所有半导体器件提供软开关条件。实验结果验证了所提出的转炉操作和理论分析的完整性。
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引用次数: 4
Multi-channel Collection Tree Protocol for Wireless Sensor Networks 无线传感器网络的多通道采集树协议
Chondilok Buengbon, C. Tanwongvarl, S. Chantaraskul
Interference is one of the major factors influencing system performance of Wireless Sensor Networks (WSNs). This issue needs a serious attention, since WSNs are typically operating on the shared and unlicensed spectrum band. In other words, interference may not be controllable especially under the coexistence of devices operating with different standards within the same area. Collection Tree Protocol (CTP) is a routing protocol that is able to support large scale WSNs. With its ability, low level interference can be overcome by the routing process. This paper proposed an adaptation of CTP, so called multi-channel CTP, which provides higher system tolerance to the interference by allowing the multiple channel usage on top of the routing ability. The proposed system is evaluated via system level simulation and the results show the system performance enhancement under severe interference scenario in comparison with the traditional CTP.
干扰是影响无线传感器网络系统性能的主要因素之一。由于无线传感器网络通常在共享和未经许可的频段上运行,因此需要认真关注这个问题。换句话说,干扰可能是不可控制的,特别是在同一区域内不同标准的设备共存的情况下。CTP (Collection Tree Protocol)是一种能够支持大规模无线传感器网络的路由协议。利用这种能力,可以在路由过程中克服低电平干扰。本文提出了对CTP的一种改进,即多通道CTP,它在路由能力的基础上允许多通道使用,从而提高了系统对干扰的容忍度。通过系统级仿真对该系统进行了评估,结果表明,与传统的CTP相比,该系统在严重干扰情况下的性能有所提高。
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引用次数: 5
期刊
2013 10th International Conference on Electrical Engineering/Electronics, Computer, Telecommunications and Information Technology
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