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2016 2nd International Conference on Electrical, Computer & Telecommunication Engineering (ICECTE)最新文献

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Device modeling and performance analysis of perovskite solar cells based on similarity with inorganic thin film solar cells structure 基于无机薄膜太阳能电池结构相似性的钙钛矿太阳能电池器件建模与性能分析
Md. Faruk Hossain, M. Faisal, H. Okada
The photovoltaic cells are the best way to use solar energy by absorbing the photons radiation. The aim of this paper work is to simulate perovskite solar cell and finding the optimum thickness of the absorber layer. Here we run a simulation of perovskite solar cells on SCAPS-1D simulator software. The cell structure employs similarity with other inorganic solar cells such like CIGS, CdTe and Cu(In,Ga)Se2. The absorber layer is CH3NH3PbI3−xCl3 used here for its great attention as highly efficient absorber. A high open circuit voltage of 1.112 V achieved here and the efficiency is more than 22%. The effect of work function of front and back contact also has a great influence over the fill factor and on the efficiency. By varying the thickness of different layers optimum result has been achieved and demonstrates that in I-V characteristics and quantum efficiency (QE).
光伏电池是利用太阳能吸收光子辐射的最好方法。本文的目的是模拟钙钛矿太阳能电池,找出吸收层的最佳厚度。本文在SCAPS-1D模拟软件上对钙钛矿太阳能电池进行了模拟。电池结构与其他无机太阳能电池如CIGS、CdTe和Cu(In,Ga)Se2相似。吸收层为CH3NH3PbI3−xCl3,因其作为高效吸收剂而备受关注。在这里实现了1.112 V的高开路电压,效率超过22%。前后接触功函数的影响对填充系数和效率也有很大的影响。通过改变不同层的厚度,得到了最优的结果,并证明了在I-V特性和量子效率(QE)方面。
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引用次数: 14
Nonlinear modeling and control of DC machines: A partial feedback linearization approach 直流电机的非线性建模与控制:部分反馈线性化方法
Subroto K. Sarkar, S. Das
This paper presents the design of a partial feedback linearization controller for speed control of DC machines. The design of the controller is presented based on the nonlinear modeling of the plant. The model of the plant is obtained from differential dynamic equations. A stability analysis is presented to guarantee the stability of the proposed design. To validate the effectiveness of the controller, DC machine systems are simulated. Simulation studies show that the proposed controller provides the accuracy and high performance of DC machines.
本文设计了一种用于直流电机速度控制的部分反馈线性化控制器。在对被控对象进行非线性建模的基础上,给出了控制器的设计。该模型由微分动力学方程得到。为了保证设计的稳定性,进行了稳定性分析。为了验证该控制器的有效性,对直流电机系统进行了仿真。仿真研究表明,所提出的控制器能够保证直流电机的精度和高性能。
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引用次数: 9
Performance analysis of grid connected PV array with H-bridge inverter controlled by angular modulation scheme 角调制控制h桥逆变器并网光伏阵列性能分析
M. A. Munjer, Md. Faruk Hossain, Md. Akramul Alim
This paper presents a modular cascaded H-bridge multilevel photovoltaic (PV) inverter for three-phase grid-connected solar cell. An angular controlled modulation scheme has been proposed for Modular Multilevel Converter in this application. To maximize the solar energy extraction in various irradiance, Incremental Conductance algorithm for maximum power point tracking is used, which allows independent control of each solar cell voltage. The performance of the system has also been analyzed at variable irradiance on the each cell. A simulation model of three-phase seventeen-level cascaded H-bridge inverter has been built by using twenty four number of H-bridge modules (eight modules per phase). Each H-bridge module is connected to a 270-W solar panel. Simulation results are presented to verify the feasibility of the proposed approach where on an average 1.5% THD is achieved in load phase voltage.
提出了一种用于三相并网太阳能电池的模块化级联h桥多电平光伏逆变器。在此应用中,提出了一种角度控制的模块化多电平变换器调制方案。为了在不同辐照度下最大限度地提取太阳能,采用增量电导算法进行最大功率点跟踪,可以独立控制每个太阳能电池的电压。分析了该系统在不同辐照度下的性能。采用24个h桥模块(每相8个模块),建立了三相17电平级联h桥逆变器的仿真模型。每个h桥模块连接一个270瓦的太阳能电池板。仿真结果验证了所提方法的可行性,在负载相电压下平均实现1.5%的THD。
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引用次数: 1
Transformational generative grammar (TGG): An efficient way of parsing Bangla sentences 转换生成语法(TGG):一种分析孟加拉语句子的有效方法
Mohammad Kamrul Huq Maroof, Lamia Alam, M. M. Hoque
Natural language processing (NLP) refers to the ability of systems to process sentences in a natural language such as Bangla, rather than in a specialized artificial computer language. Computer processing of Bangla language is a challenging task due to its varieties of words formation and way of speaking. The same meaning can be expressed in different ways which is a great challenge to face for translation by an automatic machine translation system. With the advent of internet technology and e-commerce, the demand of automatic machine translation has been increased. Parsing is essential for any type of natural language processing. Parsing of Bangla natural language can be used as a subsystem for Bangla to another language machine aided translation. A parser usually checks the validity of a sentence using grammatical rule. In this paper, we propose a set of transformational generative grammar (TGG) in conjunction with phrase structure grammar to generate parse tree and to recognize assertive, interrogative, imperative, optative and exclamatory sentences of Bangla language. It is applicable for many sentences that cannot be parsed using only phrase structure grammars. The process involves analysis of Bangla sentence morphologically, syntactically where tokens and grammatical information are passed through parsing stage and finally output can be achieved. A dictionary of lexicon is used which contains some syntactic, semantic, and possibly some pragmatic information. We have tested our system for different kinds of Bangla sentences and experimental result reveals that the overall success rate of the proposed system is 84.4%.
自然语言处理(NLP)是指系统处理自然语言(如孟加拉语)句子的能力,而不是专门的人工计算机语言。由于孟加拉语构词法和说话方式的多样性,计算机处理是一项具有挑战性的任务。同样的意思可以有不同的表达方式,这是机器自动翻译系统面临的巨大挑战。随着互联网技术和电子商务的出现,对自动机器翻译的需求越来越大。解析对于任何类型的自然语言处理都是必不可少的。孟加拉语自然语言的解析可以作为孟加拉语到另一种语言机器辅助翻译的子系统。解析器通常使用语法规则检查句子的有效性。本文提出了一套结合短语结构语法的转换生成语法(TGG)来生成解析树,并对孟加拉语的断言句、疑问句、祈使句、选择句和感叹句进行识别。它适用于许多只使用短语结构语法无法解析的句子。该过程包括对孟加拉语句子进行形态、句法分析,并通过解析阶段传递标记和语法信息,最终得到输出。使用词典词典,其中包含一些语法、语义和可能的一些语用信息。我们对不同类型的孟加拉语句子进行了测试,实验结果表明,该系统的总体成功率为84.4%。
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引用次数: 0
Minimization of output fluctuations of wind farm integrated hybrid power system using new pitch controller 采用新型节距控制器的风电场综合混合动力系统输出波动最小化
Fariya Tabassum, M. Sheikh, M. Hasanuzzaman
In this paper a central supervisory control system based on wind speed data is proposed for calculating reference power for the blade pitch angle of each wind turbine. Low Pass Filter (LPF) technique is used to generate proposed blade control system of wind farm. The wind farm consists of 5 induction generators (IG) and is connected to a multi machine power system composed of 4 synchronous generators (SG) and a load. An extra LPF is used for calculating reference power for IG4 and IG5. Simulations have been done by PSCAD/EMTDC program by using real wind speed data. Simulation results clearly indicate that proposed blade control system can maintain frequency with less energy losses.
本文提出了一种基于风速数据的中央监控系统,用于计算各风力机叶片俯仰角的参考功率。采用低通滤波技术生成风电场叶片控制系统。风电场由5台感应发电机(IG)组成,并与4台同步发电机(SG)和一个负载组成的多机电力系统相连。额外的LPF用于计算IG4和IG5的参考功率。利用PSCAD/EMTDC软件对实际风速数据进行了模拟。仿真结果清楚地表明,所提出的叶片控制系统能够以较小的能量损失保持频率。
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引用次数: 0
Impact of energy storage devices on reliability of distribution system 储能装置对配电系统可靠性的影响
Md Iamul Arafat Raihan
Modern society expects the power supply to be continuously available on demand because of its pattern of social and working habits. Hence, reliability is a key factor in power system designing and planning. Reliability of power system can be monitored at various levels of generation, transmission and distribution. This paper examines the impact of large scale energy storage on distribution system reliability. Both distributed and lumped placement of energy storage devices have been considered to calculate its impact on feeder as well as overall system reliability. DIgSILENT Power Factory 14.1 has been used as simulation tool. Results show that with introduction of energy storage devices into distribution system, duration of outage decreases in an annum. However, the inclusion of storage devices increases the frequency of outage to some extents.
现代社会的社会模式和工作习惯决定了人们对电力供应的持续需求。因此,可靠性是电力系统设计和规划的关键因素。电力系统的可靠性可以在发电、输电和配电的各个层面进行监测。本文研究了大规模储能对配电系统可靠性的影响。考虑了储能装置的分布式和集总布置,计算了其对馈线和整个系统可靠性的影响。使用DIgSILENT Power Factory 14.1作为仿真工具。结果表明,在配电网中引入储能装置后,配电网的年停电时间有所减少。然而,存储设备的加入在一定程度上增加了中断的频率。
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引用次数: 7
Performance analysis of 4 × 4 FBG-OC-based bidirectional optical cross connects using ten-port ROC in WDM networks WDM网络中基于10端口ROC的4 × 4 fbg - oc双向光交叉连接性能分析
Punab Chandra Kundu, P. Sarker, Nirupam Das, Md. Rabiul Islam
In this paper, the crosstalk performance of a 4 × 4 fiber bragg grating and optical circulator based bidirectional optical cross connects using ten-port rotatable optical circulator (ROC) in wavelength division multiplexing bidirectional ring networks has been presented. The number of coherent and incoherent crosstalk components has been identified. The performance is evaluated in terms of total crosstalk power and BER. Also the effect of fiber brag grating parameter has been investigated considering the power ratio of each coherent and incoherent field, relative to the power of main signal.
本文研究了在波分复用双向环形网络中使用10端口可旋转光环路器(ROC)的4 × 4光纤光栅和光环路器双向交叉连接的串扰性能。确定了相干和非相干串扰分量的数量。用总串扰功率和误码率来评价系统的性能。同时考虑了各相干场和非相干场相对于主信号功率的功率比,研究了光纤光栅参数的影响。
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引用次数: 0
Comparison of two types of graphene coated fiber optic SPR biosensors 两种石墨烯涂层光纤SPR生物传感器的比较
Kamrun Nahar Shushama, M. Rana, Reefat Inum
In the present paper, surface plasmon resonance based two graphene coated fiber optic biosensors are analyzed using a four layer model. Graphene is used as third layer of a four layer model. Gold or silver is used as second layer and graphene is coated around the silver or gold. A theoretical study has been carried out for two sensors using gold and silver. Two biosensors have been studied separately and then a comparison has been made. Sensitivity has been studied for different number of graphene layers.
本文采用四层模型分析了基于表面等离子体共振的两种石墨烯涂层光纤生物传感器。石墨烯被用作四层模型的第三层。金或银被用作第二层,石墨烯被涂在银或金的周围。对金、银两种传感器进行了理论研究。分别对两种生物传感器进行了研究,并进行了比较。对不同石墨烯层数的灵敏度进行了研究。
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引用次数: 3
Human activity recognition based on Gaussian mixture model and directive local binary pattern 基于高斯混合模型和定向局部二值模式的人体活动识别
S. K. Dhar, Mahmudul Hasan, Shayhan Ameen Chowdhury
Recognizing human activities has become an active research area in computer vision because of its promising need and use in many applications. In this paper, we represent a method for recognizing human activities in video. In order to recognize different activities accurately a distinctive and informative feature vector is required which can encode more distinctive information. We introduce a feature named Directive Local Binary Pattern (DLBP) which we develop on the basis of our experimental result that is orientation information is more informative than magnitude information for binary silhouette based recognition. The proposed Directive Local Binary Pattern (DLBP) incorporates orientation information with intensity differences of binary silhouette images. It is further combined with Edge Orientation Histogram (EOH) and forms a more distinctive and informative feature set. By means of the extracted features, Support vector machine is used for training and recognition which is a robust classifier. The proposed method for recognizing human activities is experimented on different videos containing various moving humans and the outcomes of our method are encouraging.
人体活动识别由于其广阔的应用前景,已成为计算机视觉领域的一个活跃研究领域。在本文中,我们提出了一种识别视频中人类活动的方法。为了准确地识别不同的活动,需要一个具有鲜明性和信息量的特征向量,该特征向量可以编码更多具有鲜明性的信息。本文介绍了一种基于定向局部二值模式(DLBP)的特征,该特征是在我们的实验结果的基础上开发的,即在基于二值轮廓的识别中,方向信息比大小信息更有信息量。提出的指令局部二值模式(Directive Local Binary Pattern, DLBP)结合了二值轮廓图像的方向信息和强度差异。它进一步与边缘方向直方图(EOH)相结合,形成一个更独特和信息丰富的特征集。利用提取的特征,利用支持向量机进行训练和识别,是一种鲁棒分类器。我们在不同的视频中对所提出的人类活动识别方法进行了实验,结果令人鼓舞。
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引用次数: 6
Developing a framework for analyzing social networks to identify human behaviours 开发一个分析社会网络以识别人类行为的框架
Khandakar Tareq Alam, S. M. E. Hossain, M. Arefin
Nowadays, online social networks become an important part in people's everyday life. Most of the people share their feelings, views, likings and disliking using social networks. By analysing social networks' data properly, it is possible to identify the behavioural patterns of the users. Considering this fact, in this paper we present a framework to analyse social networks' data to identify human behaviours. We have developed a framework for the collection and analysis of large data by crawling public data obtained from the users of online social networks. The system can analyze data posted by the users in two different languages. Experimental results show that social network is a good resource for estimating attitudes of the people.
如今,在线社交网络已成为人们日常生活的重要组成部分。大多数人在社交网络上分享他们的感受、观点、喜欢和不喜欢。通过适当地分析社交网络的数据,有可能确定用户的行为模式。考虑到这一事实,在本文中,我们提出了一个框架来分析社交网络的数据,以识别人类行为。我们开发了一个框架,通过从在线社交网络用户那里获取公共数据来收集和分析大数据。该系统可以分析用户用两种不同语言发布的数据。实验结果表明,社会网络是估计人们态度的良好资源。
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引用次数: 3
期刊
2016 2nd International Conference on Electrical, Computer & Telecommunication Engineering (ICECTE)
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