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2016 International Conference on Emerging Trends in Engineering, Technology and Science (ICETETS)最新文献

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Biosorption of victoria blue using Zizyphus oenoplia seed: Evaluation of experimental and modeling studies 紫紫种子对维多利亚蓝的生物吸附:实验和模型研究的评价
R. Tamilarasan, V. Sureshkumar, M. kumar
The present study predicts the feasibility for the adsorptive removal of Victoria Blue dye (VB dye) from aqueous solution using a low cost biosorbent Zizyphus Oenoplia seed (ZOS). In this study, a batch mode adsorption experiments were carried out using various parameters such as pH, contact time, concentration of dye, adsorbent dosage and temperature. The feasibility of the process is evaluated with various modeling isotherm equations like Freundlich, Langmuir and dimensionless separation factor (RL). The kinetics of the biosorption process is evaluated by using pseudo-first order and pseudo-second order equations. The mode of diffusion of biosorption was evaluated with intraparticle diffusion model equation. The thermodynamic parameters like change in enthalpy (ΔHo); change in entropy (ΔSo) and Gibbs free energy change (ΔGo) are calculated using Van't Hoff plot. The biosorbent material was characterized with Fourier Transform Infrared (FTIR) spectroscopy and the morphology of the adsorbent material was analysed with Scanning Electron Microscope (SEM) in before and after adsorption of VB dye.
本研究预测了利用低成本生物吸附剂紫紫籽(ZOS)吸附去除水溶液中维多利亚蓝染料(VB染料)的可行性。本研究在pH、接触时间、染料浓度、吸附剂用量、温度等参数的影响下,进行了间歇式吸附实验。采用Freundlich、Langmuir和无量纲分离因子等等温线方程对该工艺的可行性进行了评价。采用拟一阶和拟二阶方程对生物吸附过程的动力学进行了评价。利用颗粒内扩散模型方程对生物吸附的扩散模式进行了评价。热力学参数如焓变(ΔHo);利用范霍夫图计算熵变(ΔSo)和吉布斯自由能变化(ΔGo)。用傅里叶变换红外光谱(FTIR)对吸附材料进行了表征,并用扫描电镜(SEM)分析了吸附VB染料前后吸附材料的形貌。
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引用次数: 1
A novel approach for detection of diabetic macular edema 一种检测糖尿病黄斑水肿的新方法
Anu Johny, Abraham Thomas
Diabetic macular edema (DME) is an eye disease that belongs to diabetic retinopathy which directs to vision loss. DME, which is a contusion in the macular region of eye is a common vision problem seen in diabetic patients. Hard exudates (bright lesions)in the fundus image indicates the presence of DME. Early detection of Macular Edema in diabetic patients prevents blindness. DME occurs when fluid and protein deposits collect on or under the macula of the eye. These leakages cause the macula to thicken and swell, progressively distorts a persons vision. So in this article detection of exudates and its proximity towards macula determines and thereby its severity level. This article presents the computer based approach for the disease detection, which includes the steps image preprocessing, localization and masking of the optic disc, detection of fovea, ROI extraction, motion pattern generation, determination of disease severity level. First stage, detecting of DME and the next stage is assessing the severity of DME. An easier method for DME detection is also done.
糖尿病性黄斑水肿(DME)是一种以视力丧失为主要目的的糖尿病视网膜病变。DME是糖尿病患者常见的视力问题,是眼部黄斑区域的一种挫伤。眼底图像中的硬渗出物(亮斑)提示二甲醚的存在。糖尿病患者早期发现黄斑水肿可预防失明。当液体和蛋白质沉积在眼睛的黄斑上或下面时,就会发生DME。这些渗漏导致黄斑变厚和膨胀,逐渐扭曲人的视力。所以在这篇文章中,渗出物的检测及其与黄斑的接近程度决定了其严重程度。本文介绍了基于计算机的疾病检测方法,包括图像预处理、视盘定位与掩蔽、中央凹检测、ROI提取、运动模式生成、疾病严重程度确定等步骤。第一阶段是检测二甲醚,下一阶段是评估二甲醚的严重程度。本文还提出了一种更简单的二甲醚检测方法。
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引用次数: 12
Preparation and characterisation of Nd0.6 (Sr0.2Ba0.2)0.4 CoO3 cathode material for solid oxide fuel cell applications 固体氧化物燃料电池用Nd0.6 (Sr0.2Ba0.2)0.4 CoO3正极材料的制备与表征
A. Subashini, A. Kavitha
The single-phase nano-crystalline Nd0.6(Sr0.2Ba0.2)0.4CoO3 powder was synthesized by a microwave assisted combustion method within a very short time of 50 minutes and the substitution of Sr and Ba for Nd preserved the NdCoO3 structure. The synthesized material was characterized by X-ray diffraction (XRD), SEM, porosity, BET surface area, thermal expansion coefficient (TEC) and the electrical conductivity measurement studies to know the performance of the cathode material. The average particle size of the prepared cathode material was ~24nm. Both the Sr (0.2) and Ba (0.2) doping does not affect the orthorhombic perovskite structure. The synthesized nano-crystalline Sr and Ba doped NdCoO3 samples could be densified to ~97.93% of theoretical density even at low sintered temperature of 800K for 5h. Doping of Sr and Ba was improved the electronic conductivity of NdCoO3 and the maximum conductivity was attained at 600°C for Nd0.6(Sr0.2Ba0.2)0.4CoO3.
采用微波辅助燃烧法在50分钟内合成了单相纳米晶Nd0.6(Sr0.2Ba0.2)0.4CoO3粉末,其中Sr和Ba取代了Nd,保留了NdCoO3的结构。通过x射线衍射(XRD)、扫描电镜(SEM)、孔隙率、BET比表面积、热膨胀系数(TEC)和电导率测量研究对合成材料进行了表征,了解了正极材料的性能。制备的正极材料平均粒径为~24nm。Sr(0.2)和Ba(0.2)的掺杂均不影响钙钛矿的正交结构。在800K的低烧结温度下烧结5h,合成的Sr和Ba掺杂纳米晶NdCoO3样品的密度可达到理论密度的~97.93%。Sr和Ba的掺杂提高了NdCoO3的电导率,Nd0.6(Sr0.2Ba0.2)0.4CoO3的电导率在600℃时达到最大值。
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引用次数: 0
A survey on wireless ad hoc network: Issues and implementation 无线自组网综述:问题与实现
S. Sharmila, T. Shanthi
Wireless Ad hoc Network is the collection of wireless mobile nodes (devices) that are able to dynamically form a temporary network without the use of any existing network infrastructure or centralized administration. This paper discusses the roles of ad hoc networking in future wireless communications. In this paper we surveyed the different types of ad hoc networks such as isolated ad hoc networks with large and small sizes and integrated ad hoc networks for the mobile access networks. This paper gives various advantages and applications of ad hoc network. In addition, this paper also surveyed on ad hoc networks challenges in terms of Quality of Service (QoS), power control and security. This work discusses the implementation issues in ad hoc network and performance improvement by MIMO and cognitive radio techniques.
无线自组织网络是无线移动节点(设备)的集合,这些节点(设备)能够在不使用任何现有网络基础设施或集中管理的情况下动态地形成临时网络。本文讨论了自组织网络在未来无线通信中的作用。本文对不同类型的自组网进行了综述,包括大小规模的隔离自组网和移动接入网的集成自组网。本文介绍了自组网的各种优点和应用。此外,本文还从服务质量(QoS)、功率控制和安全性方面探讨了自组织网络面临的挑战。本文讨论了在自组织网络中的实现问题以及MIMO和认知无线电技术的性能改进。
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引用次数: 23
Series compensation technique based energy management at micro-grid 基于串联补偿技术的微电网能量管理
R. Arunmozhi, J. Arokiaraj
This paper describes the series compensation method based Energy management at micro grid. A series compensator is attached to series with the power supply. The proposed system which provides relating to specific difference between the supply voltage and resultant voltage. A compensator gets the energy from the power assist circuit. The power assist circuit which is used to deliver the power into series voltage compensator without isolation problems and It is used to reducing the power loss of the converter. As the compensator produces positive voltage and negative voltage which evaluates the step-up and step-down mode of operation with respectively. As a result, the DC/DC converter power rating can be extremely minimized. The DC voltage is controlled by using power assist circuit and It consists of flyback converter. The proposed circuit result is minimized power loss of converter and improved the efficiency. A trail model 500W, 230V and 50-Hz has been evaluated. A series compensation technique based energy management can obtained the maximum efficiency and decreased the power rating.
介绍了基于串联补偿的微电网能量管理方法。串联补偿器与电源串联在一起。该系统提供了电源电压和合成电压之间的特定差值。补偿器从辅助电路获得能量。电源辅助电路用于将电源送入串联电压补偿器而不存在隔离问题,并用于降低变换器的功率损耗。由于补偿器产生正电压和负电压,分别对升压和降压工作方式进行评估。因此,DC/DC转换器的额定功率可以非常小。直流电压控制采用电源辅助电路,由反激变换器组成。该电路使变换器的功率损耗降到最低,提高了效率。对一个500W, 230V, 50hz的跟踪模型进行了评估。采用基于串联补偿的能量管理技术可以在降低额定功率的同时获得最大的效率。
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引用次数: 3
Ear detection using active contour model 基于主动轮廓模型的耳朵检测
R. Deepak, A. Nayak, K. Manikantan
Ear detection in face images, which is invariant to background and pose, is very challenging. This paper proposes a novel solution to this problem with the use of Snakes as active contour model. The proposed method encompasses two stages, namely, Snake-based Background Removal (SBR) and Snake-based Ear Localization (SEL). SBR is used to remove background from a face image and thereafter, SEL is used to localize the ear. A feedback is provided to this system with the use of Support Vector Machines (SVM) which classifies the region of the image localized by SEL as an ear or non-ear entity. Experimental results obtained by applying the proposed algorithm on two benchmark face databases, namely CMU-PIE and ColorFERET, show a significant improvement in Localization Rate, and a substantial reduction in the computation time.
人脸图像中的耳朵检测是一个非常具有挑战性的问题,因为它不受背景和姿态的影响。本文提出了一种利用蛇形轮廓作为活动轮廓模型的新方法。该方法包括基于蛇的背景去除(SBR)和基于蛇耳的定位(SEL)两个阶段。首先用SBR去除人脸图像的背景,然后用SEL对耳朵进行定位。使用支持向量机(SVM)将SEL定位的图像区域分类为耳朵或非耳朵实体,为该系统提供反馈。将该算法应用于CMU-PIE和ColorFERET两个基准人脸数据库的实验结果表明,该算法在定位率上有显著提高,计算时间也大幅缩短。
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引用次数: 12
A case study on memory efficient prediction models for web prefetching web预取中内存效率预测模型的实例研究
C. D. Gracia, S. Sudha
The user perceived latency in accessing the web resources is yet a challenging issue due to the enormous user strength over the Internet and their access to the increased volume of web pages. The repetitive access of the same web objects from the server helps in inferring certain user access patterns. These access patterns represented using Markov trees have been used for web prefetching. Web prefetching is a technique that is used to minimize the user perceived latency. However, the existing Markov model based approaches consume lot of memory due to the formation of new node and separate branch for each access. Therefore, to overcome this memory efficient prediction models were proposed in our earlier work with the objective of minimizing memory. These models are derivatives of the Markov models that avoid formation of separate branch for every access leading to a single linear tree. However, their performance on prefetching is not studied. Hence, an attempt is being made to study their performances and compare with the existing Markov models. The memory efficient models exhibit comparatively large reduction in memory with a slight improvement in the hit rate. Further, the memory complexity is of O (n) compared to the existing models which are of O (n2), where `n' is the number of distinct URL's. The experiments establish the effectiveness and applicability of the prediction models.
由于互联网上庞大的用户力量和他们对网页的访问量的增加,用户在访问web资源时感知到的延迟仍然是一个具有挑战性的问题。服务器对相同web对象的重复访问有助于推断某些用户访问模式。这些使用马尔可夫树表示的访问模式已用于web预取。Web预取是一种用于最小化用户感知延迟的技术。然而,现有的基于马尔可夫模型的方法由于每次访问都会形成新的节点和单独的分支而消耗大量的内存。因此,为了克服这一问题,我们在早期的工作中提出了以最小化内存为目标的高效预测模型。这些模型是马尔可夫模型的衍生物,避免了每一次通向单一线性树的访问都形成单独的分支。然而,它们在预取方面的性能尚未得到研究。因此,尝试研究它们的性能,并与现有的马尔可夫模型进行比较。内存高效模型显示出相对较大的内存减少,命中率略有提高。此外,与现有模型的内存复杂度为O (n)相比,该模型的内存复杂度为O (n),其中' n'是不同URL的数量。实验验证了预测模型的有效性和适用性。
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引用次数: 4
Analysis and estimation of harmonics using wavelet packet transform 基于小波包变换的谐波分析与估计
K. Thangaraj, R. Archana, S. A. Begam
This paper develops an approach based on wavelet technique for the evaluation of harmonic contents of power system waveform. The proposed algorithm decomposes the signal waveforms into the uniform frequency sub-bands corresponding to the odd-harmonic components of the signal. The proposed implementation of algorithm determines the frequency bands of harmonics which maintains the time and frequency relationship of the prototype waveforms and uses a method to suppress those harmonics. A comparative analysis will be done with results obtained from the conventional method of wavelet transform (WT) and wavelet packet transform (WPT) for different measuring conditions and simulation results are given.
本文提出了一种基于小波变换的电力系统谐波分量评估方法。该算法将信号波形分解为与信号奇谐波分量相对应的等频子带。该算法在保持原型波形时频关系的基础上确定谐波的频带,并采用抑制谐波的方法。将小波变换与小波包变换在不同测量条件下的结果进行对比分析,并给出仿真结果。
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引用次数: 1
Performance analysis of voltage regulated inverter for FLC based PV-wind hybrid power system with real time data 基于FLC的PV-wind混合电力系统稳压逆变器性能实时数据分析
A. P. Pavan Kumar, A. M. Parimi, K. Rao
The sun and wind based generation are well-thoroughly considered to be alternate source of green power generation which can mitigate the power demand issues. As sun powered and wind power advancements are entrenched and the infiltration of these Renewable Energy Sources (RES) into to network is expanding dynamically, testing errand is to keep up the voltage and frequency of the power generated from RES consistent as they specifically relies upon environmental conditions. So as to outline a legitimate control and to harness power from RES the learning of natural conditions for a specific area is fundamental. With this fundamental information of the environmental conditions, a suitable Photovoltaic and Wind power generations can be chosen to extract maximum power from the conditions. Fuzzy Logic Controller (FLC) based Maximum Power Point Tracking (MPPT) controlled boost converter are utilized for viable operation and to keep DC voltage steady at desired level. The control scheme of the inverter is intended to keep the load voltage and frequency of the AC supply at constant level regardless of progress in natural conditions and burden. A Simulink model of the proposed Hybrid system with the MPPT controlled Boost converters and Voltage regulated Inverter for stand-alone application is developed in MATLAB R2015a, Version 8.5.0. The ongoing information of Wind Speed and Solar Irradiation levels are recorded at BITS-Pilani, Hyderabad Campus utilizing climate observing framework introduced at the area the performance of the voltage regulated inverter under constant and varying linear, non-linear AC load with the real time data of the solar irradiation and wind speed as input is analyzed. The investigation shows that the magnitude of load voltage and frequency of the load voltage is maintained at desired level by the proposed inverter control logic.
太阳能和风能发电被认为是绿色发电的替代来源,可以缓解电力需求问题。随着太阳能和风能的发展,以及这些可再生能源(RES)对电网的渗透正在不断扩大,测试任务是保持可再生能源发电的电压和频率的一致性,因为它们特别依赖于环境条件。为了勾勒出合法的控制并利用可再生能源的力量,了解特定地区的自然条件是至关重要的。有了这些环境条件的基本信息,就可以选择合适的光伏发电和风力发电,从这些条件中提取最大的电力。基于模糊逻辑控制器(FLC)的最大功率点跟踪(MPPT)控制升压变换器可以有效运行,并使直流电压稳定在期望的水平。逆变器的控制方案旨在使交流电源的负载电压和频率保持在恒定水平,而不受自然条件和负荷的影响。在MATLAB R2015a, 8.5.0版本中开发了MPPT控制升压变换器和稳压逆变器混合系统的Simulink模型,用于单机应用。利用该地区引入的气候观测框架,在海德拉巴理工学院皮拉尼校区记录了风速和太阳辐照水平的持续信息,并以太阳辐照和风速的实时数据为输入,分析了稳压逆变器在恒定和变化的线性和非线性交流负荷下的性能。研究表明,所提出的逆变器控制逻辑使负载电压的幅值和频率保持在期望的水平。
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引用次数: 3
Low-power FPGA based security system for cabinet protection 基于FPGA的低功耗机柜安全保护系统
P. Gopikrishna, H. Kamath, Prasad Sogolad, G. Kulkarni
In unauthorized areas, providing access to only authorized persons is a problem. The keyless entry eliminates the problems associated with the key duplication and break-ins but such a system has to be impeccable. Since the keyless security system works on batteries when operated as stand-alone system, a low power design is very much desired. In our approach, depending on the states of RFID and PIR sensor outputs, access is given only to authorized persons, whose RFID tag data matches with that of the program memory of FPGA. Further, the power saving is achieved in the place and route phase. Here, we make use of simulated annealing for placement and Lee maze router for routing. A comparison of initial and final placement is presented along with the power savings.
在未经授权的区域,只向授权人员提供访问权限是一个问题。无钥匙进入消除了与密钥复制和闯入相关的问题,但这样的系统必须是无可挑剔的。由于无钥匙安全系统在作为独立系统运行时使用电池,因此非常需要低功耗设计。在我们的方法中,根据RFID和PIR传感器输出的状态,只有授权人员才能访问,其RFID标签数据与FPGA的程序存储器相匹配。此外,在位置和路由阶段实现了节能。在这里,我们使用模拟退火进行布局,李迷宫路由器进行路由。比较了初始位置和最终位置以及节省的功耗。
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引用次数: 1
期刊
2016 International Conference on Emerging Trends in Engineering, Technology and Science (ICETETS)
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