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2015 Moratuwa Engineering Research Conference (MERCon)最新文献

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Aperture-array directional sensing using 2-D beam digital filters with doppler-radar front-ends 基于多普勒雷达前端的二维波束数字滤波器的孔径阵列定向传感
Pub Date : 2015-04-07 DOI: 10.1109/MERCON.2015.7112357
Tharindu Randeny, A. Madanayake, Arindam Sengupta, Yiran Li, Changzhi Li
A directional sensing algorithm is proposed employing doppler radar and low-complexity 2-D IIR spatially bandpass filters. The speed of the scatterer is determined by the frequency shift of the received signal following down-conversion. The downconversion is done by mixing it with the instantaneous transmitted signal. The direction of the scatterer is determined by the means of 2-D plane-wave spectral characteristics, using 2-D IIR beam filters. The proposed architecture was simulated for three scatterers at 10,° 30,° 60° from array broadside, traveling at speeds of 31 ms, -1 18 ms-1 and 27 ms -1, respectively. A doppler radar module was used to transmit and receive reflected signals, that has a carrier frequency of 2.4 GHz. Simulations show both direction and doppler information being enhanced.
提出了一种利用多普勒雷达和低复杂度二维IIR空间带通滤波器的定向传感算法。散射体的速度由下变频后接收信号的频移决定。下变频是通过将其与瞬时传输信号混合来完成的。利用二维IIR波束滤波器,利用二维平面波的光谱特性确定散射体的方向。在距离阵列侧面10°、30°和60°的位置,以31 ms、-1 18 ms-1和27 ms-1的速度对三种散射体进行了仿真。多普勒雷达模块用于发射和接收反射信号,其载波频率为2.4 GHz。仿真结果表明,方向和多普勒信息都得到了增强。
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引用次数: 0
Mathematical analysis of startup mark in elastic tape on a narrow fabric loom 窄幅织布机弹力带启动痕迹的数学分析
Pub Date : 2015-04-07 DOI: 10.1109/MERCON.2015.7112319
H. Dayaratne, R. Premakumara, Thanura Perera, S. Prince, E. Fernando, T. Jayawardane
Start-up marks are considered as one of the major defect in woven fabric, it occurs when the loom is restarted after loom stoppage due to various reasons. This defect is more prominent in high speed weaving looms especially with elastic warp yarns and is caused to deteriorate the fabric quality. This research paper deals with the mathematical analysis of the startup mark generation in elastic tape on narrow fabric loom. Mathematical analysis was carried out for both continuous operation condition and under stopping condition of the narrow fabric loom. A system simulation was carried out using the model developed and compared with the experimental results to show the accuracy of the model.
启动痕是机织物的主要缺陷之一,它发生在织机因各种原因停机后重新启动时。这一缺陷在高速织造织机上尤其在弹性经纱织机上更为突出,造成织物质量的恶化。本文研究了窄织物织机上弹性胶带启动痕迹产生的数学分析问题。对窄织物织机的连续运行工况和停机工况进行了数学分析。利用所建立的模型进行了系统仿真,并与实验结果进行了对比,验证了模型的准确性。
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引用次数: 2
Unhosted email client 无托管电子邮件客户端
Pub Date : 2015-04-07 DOI: 10.1109/MERCON.2015.7112367
R. Chathuranga, Sashrika Waidyarathna, K. Sureshkumar, Kanagasabai Erlilverl, G. Dias
We developed a new email client which runs on the browser and is not dependent on a particular server, based on the Unhosted web application architecture. The client can connect to any standard mail server directly from the browser, using IMAP and SMTP protocols so that the user is not limited to the webmail clients provided by various email service providers. As our client runs in a browser, it is independent of the operating system. It provides a uniform user experience on any mail system. As a part of our unhosted email client, we have developed a browser extension to allow HTML5 clients to connect to IMAP and SMTP servers. Using this extension, developers may introduce new e-mail clients which are both server and operating system independent. Our client application also provides offline features so that the user can load the application and read/create mail even if he/she is not currently connected to the Internet.
我们开发了一个新的电子邮件客户端,它运行在浏览器上,不依赖于特定的服务器,基于Unhosted web应用程序架构。客户端可以通过IMAP和SMTP协议直接从浏览器连接到任何标准邮件服务器,从而使用户不局限于各种电子邮件服务提供商提供的webmail客户端。由于我们的客户端在浏览器中运行,它独立于操作系统。它在任何邮件系统上提供统一的用户体验。作为我们的非托管电子邮件客户端的一部分,我们开发了一个浏览器扩展,允许HTML5客户端连接到IMAP和SMTP服务器。使用这个扩展,开发人员可以引入新的电子邮件客户端,既服务器和操作系统独立。我们的客户端应用程序还提供离线功能,以便用户可以加载应用程序并读取/创建邮件,即使他/她目前没有连接到互联网。
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引用次数: 1
Effectiveness of eleaming: Grounded theory approach 学习的有效性:扎根理论方法
Pub Date : 2015-04-07 DOI: 10.1109/MERCON.2015.7112369
Dilrukshi Gamage, S. Femando, I. Perera
Effectiveness of eLearning has been identified as an important aspect. It determines whether the stakeholders achieve the goals of eLearning. Unlike earlier, eLearning rapidly changes with the introduction of Massive Open Online Courses (MOOC). Since many students got access to experience eLearning via MOOC, perceptions of the factors leading to an effective eLearning changed according to current needs. Many users drop out of eLearning courses due to the fact that it is ineffective in many aspects. It is timely and necessary to address the needs of the users in order to achieve success in eLearning. Finding solutions to the above problem, this research used Grounded Theory (GT) methodology in finding the factors affecting an effective eLearning. We found 10 dimensions which affects a successful eLearning while actively participating in 16 eLearning courses in 5 different platforms in 2 years. This paper explains the process of GT approach which ultimately resulted in the dimensions and the explaining factors in the dimensions leading to a successful eLearning.
电子学习的有效性已被确定为一个重要方面。它决定了利益相关者是否实现了电子学习的目标。与早期不同的是,随着大规模开放在线课程(MOOC)的引入,电子学习迅速发生了变化。由于许多学生通过MOOC获得了在线学习的体验,对有效在线学习的因素的看法也随着当前的需求而改变。许多用户退出了电子学习课程,因为它在很多方面都是无效的。为了在电子学习中取得成功,及时解决用户的需求是必要的。为了解决上述问题,本研究使用扎根理论(GT)方法来寻找影响有效电子学习的因素。我们发现了影响成功在线学习的10个维度,同时在2年内积极参与了5个不同平台的16门在线学习课程。本文解释了GT方法最终产生维度的过程,以及导致成功电子学习的维度中的解释因素。
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引用次数: 2
How the performance measurement of supply chain contributes in achieving organisational objectives of Sri Lankan apparel organisations 供应链绩效衡量如何有助于斯里兰卡服装组织实现组织目标
Pub Date : 2015-04-07 DOI: 10.1109/MERCON.2015.7112322
U. N. Narawita, L. Layangani
Half way through the evolution of supply chain management, the measurement of performance became an important component to the successful implementation of its concepts and practices. The intense competition in the apparel manufacturing industry has encouraged the players to focus not only on the profitability of their businesses but also on the elements such as supplier - customer relationship management and optimization of every single echelon along the supply chain. This research presents a detailed study and an analysis carried out to determine the impact of the performance measurement systems established in apparel companies on their organizational objectives in Sri Lankan context. The apparel manufacturing companies involve in export trade that are registered under Export Development Board were considered as the population and the apparel exporting organisations which are registered under Sri Lanka Apparel Exporters' Association were considered as the sample for this research. All the data is gathered via an online questionnaire and focus respondents are the senior level managers in these apparel manufacturing organizations. In the data analysis phase, the Cronbach's alpha, the principal component analysis and regression analysis became extensively useful. The analysis and the conclusions are solely based on the data collected from the apparel organizations in the export industry and not having even a single representation from non-exporting small scale apparel organisations is seen as a main limitation of this study. This research brought into light that measurement of organisational performance has favourable as well as antagonistic impact on organisational performances, therefore organisations should identify the tradeoffs and set division targets accordingly.
在供应链管理发展的过程中,绩效测量成为成功实施其概念和实践的重要组成部分。服装制造业的激烈竞争促使参与者不仅关注其业务的盈利能力,还关注供应商-客户关系管理和供应链上每一个梯队的优化等因素。本研究提出了一项详细的研究和分析,以确定在斯里兰卡背景下服装公司建立的绩效测量系统对其组织目标的影响。在出口发展局注册的从事出口贸易的服装制造公司被视为人口,在斯里兰卡服装出口商协会注册的服装出口组织被视为本研究的样本。所有的数据都是通过在线问卷收集的,重点受访者是这些服装制造组织的高级管理人员。在数据分析阶段,Cronbach’s alpha、主成分分析和回归分析得到了广泛的应用。分析和结论完全基于从出口行业的服装组织收集的数据,甚至没有来自非出口小型服装组织的单一代表,这被视为本研究的主要局限性。这项研究揭示了组织绩效的测量对组织绩效既有有利的影响,也有不利的影响,因此组织应该确定权衡,并相应地设定部门目标。
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引用次数: 0
Introduction of flap gates for anicuts in wet zone 湿区动物闸门的介绍
Pub Date : 2015-04-07 DOI: 10.1109/MERCON.2015.7112318
K. Pieris, P. Vitharana, M. Narayana, K. Perera, Suraj Perera
Water diversion mechanisms are commonly used in the irrigation systems and this concept is older than tank (reservoir) systems in Sri Lanka. At present, for water diversions in the wet zone anicuts are constructed by using lifting type gates. Anicuts are used to maintain required water level in the upstream by releasing only the excess water to downstream. In the lifting gate, water is allowed to flow from the bottom and this causes high erosion in the canal. The thrust force due to water pressure on the lifting gate makes it difficult to operate the system and then controlling the system is a complex task. This paper describes the construction and operation of newly introduced flap gates and issues related to lifting gate which are presently used for diversion process. In this analysis, conceptual design of a flap gate with compressive arc type wall plate is proposed to minimize use of construction materials. In the proposed system, height of the anicut could be changed from the top and then the water level in the upstream is not varied much when compared with lifting gates for varying flows in the cannel. According to the practical experiences from implemented proposed systems, controlling of the system is much easier compared to the conventional system.
引水机制通常用于灌溉系统,这一概念比斯里兰卡的水箱(水库)系统更古老。目前,对于湿区引水工程,主要采用提升式水闸施工。水闸用于维持上游所需的水位,只将多余的水释放到下游。在提升闸门中,水被允许从底部流出,这导致了运河的高度侵蚀。升降闸板上水压产生的推力使系统运行困难,控制系统是一项复杂的任务。介绍了新引进的翻板闸门的结构和运行情况,以及目前引水工艺中使用的升降闸门的有关问题。在此分析中,提出了带压弧型墙板的翻盖闸门的概念设计,以尽量减少建筑材料的使用。在该系统中,闸门的高度可以从顶部改变,因此与提升闸门相比,上游的水位变化不大,可以改变通道内的流量。根据已实现系统的实际经验,与传统系统相比,该系统的控制要容易得多。
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引用次数: 0
Cloud images capturing system for solar power level prediction 用于太阳能发电水平预测的云图捕获系统
Pub Date : 2015-04-07 DOI: 10.1109/MERCON.2015.7112363
Asanka S. Rodrigo, K. Perera, H. Priyadharshana, V. Priyanka, R. Ranasinghe
Solar energy has received increasing attention as one of the potential renewable energy sources for power generation in recent past. Introduction of Net Metering and the increment in provision for renewabIes encouraged the usage of Solar PV systems in Sri Lanka. However, the intermittent nature of solar energy has become one of the barriers for solar energy based power to be integrated to the national power grids. Due to unpredictability solar energy based power plants are non-dispatchable and can cause network instability. With an efficient and reasonably accurate predictable model, a better system balance can be achieved. Shadowing on solar PV modules results in reduction of power produced. Cloud coverage blocking the sun can be identified as the major contributor in shadowing. Identifying and tracking the clouds can be used to finally predict the solar PV output. This paper presents a methodology to obtain cloud image data and an algorithm to process the images which can be used to predict the relationship between the cloud movements and the solar PV output.
近年来,太阳能作为一种潜在的可再生能源,越来越受到人们的关注。净计量的引进和可再生能源供应的增加鼓励了斯里兰卡太阳能光伏系统的使用。然而,太阳能的间歇性已经成为太阳能发电并入国家电网的障碍之一。由于不可预测性,太阳能电站是不可调度的,可能导致电网不稳定。有了一个高效且合理准确的可预测模型,就可以实现更好的系统平衡。太阳能光伏组件上的阴影导致产生的电力减少。遮挡太阳的云层是造成阴影的主要原因。对云的识别和跟踪可用于最终预测太阳能光伏输出。本文提出了一种获取云图数据的方法和一种处理图像的算法,可以用来预测云的运动与太阳能光伏输出之间的关系。
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引用次数: 4
Hydraulic performance of ‘HOBO’ units “HOBO”机组的水力性能
Pub Date : 2015-04-07 DOI: 10.1109/MERCON.2015.7112315
G. N. Odara, S. Hettiárachchi, P. Mirihagalla
The paper presents the results of a detailed two dimensional model investigation of a rubble mound breakwater armoured with Hollow Block (HOBO) concrete armour units, with respect to the hydraulic performance. The results of the model investigations are analysed to obtain graphical and numerical relationships between the energy dissipation, wave reflection, energy transmission, wave steepness, wave period, Iribarren number and the section properties of the breakwater.
本文介绍了采用空心砌块(HOBO)混凝土装甲单元的碎石丘防波堤的水力性能的详细二维模型研究结果。对模型研究结果进行了分析,得到了能量耗散、波浪反射、能量透射、波浪陡度、波浪周期、iribare数与防波堤断面特性之间的图形关系和数值关系。
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引用次数: 0
Modeling of optical carrier recovery using four wave mixing technique for binary phase shift keying systems 基于四波混频技术的二元相移键控系统光载波恢复建模
Pub Date : 2015-04-07 DOI: 10.1109/MERCON.2015.7112354
Lakmini Malasinghe, R. Weerasuriya
Modern communication networks uses optical fibre extensively. The transport networks are upgrading its capacity continuously to provide the bandwidth requirement of the customer requirements. To provide such an increase in bandwidth, the transmission networks are moving from Amplitude Shift Keying modulation methods to Phase Shift Keying methods. In phase shift keying systems, data reception and regeneration required phase synchronization. This requires original optical carrier phase information. In this paper, we report a model for optical carrier recovery for optical synchronization of a Binary Phase Shift Keying input by exploiting Four Wave Mixing in Highly Non-Linear Fibers. The noise influence from the signal laser for the recovered carrier was analyzed.
现代通信网络广泛使用光纤。传输网络的容量不断升级,以满足客户对带宽的需求。为了提供这种带宽的增加,传输网络正在从移幅键控调制方法转向移相键控方法。在相移键控系统中,数据接收和再生需要相位同步。这需要原始的光载波相位信息。在本文中,我们报告了利用高度非线性光纤中的四波混频实现二元相移键控输入光同步的光载波恢复模型。分析了信号激光噪声对回收载波的影响。
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引用次数: 1
An approach to evaluate interrelationships among lean attributes of manufacturing systems: A case study based on lean enterprises 制造系统精益属性间相互关系的评价方法:以精益企业为例
Pub Date : 2015-04-07 DOI: 10.1109/MERCON.2015.7112348
S. Srinath, U. Dharmapriya
Lean philosophy has received more emphasize during recent times due to its robust features which facilitate productive manufacturing environments in companies regardless of the type of industry. However, enormous approaches taken to implement lean manufacturing systems inside factories, have failed to achieve desired objectives. This is mainly due to the focus on individual lean attributes rather than considering their collective impact on a system. This paper suggested an approach to measure correlations among lean attributes using their degrees of implementation. These correlations will help organizations to identify lean attributes which are interrelated. The quest is how to measure the degree to which each lean attribute has been implemented within the organization. Different companies have varying levels of lean implementations. Therefore identifying the leanness requires the organization to compare itself against a proxy company who has also implemented similar lean attributes. This research suggested an approach to identify a proxy company and then evaluate the degrees of lean attribute implementations of the selected company. The fuzzy membership functions were used to calculate the degrees. These degrees were then used to figure out possible correlations among lean attributes. The research findings showed that visual feedback made available to the factory floor had triggered a positive impact on other lean attributes in most circumstances.
近年来,精益理念受到了越来越多的重视,因为它具有强大的功能,可以促进公司的生产环境,无论行业类型如何。然而,在工厂内部实施精益制造系统的大量方法未能达到预期的目标。这主要是由于专注于单个精益属性,而不是考虑它们对系统的总体影响。本文提出了一种利用精益属性的实现程度来度量其相关性的方法。这些相关性将帮助组织识别相互关联的精益属性。问题是如何度量每个精益属性在组织内实现的程度。不同的公司有不同程度的精益实施。因此,识别精益要求组织将自己与也实现了类似精益属性的代理公司进行比较。本研究提出了一种识别代理公司的方法,然后评估所选公司的精益属性实现程度。利用模糊隶属函数计算度。然后,这些度被用来找出精益属性之间可能的相关性。研究结果表明,在大多数情况下,提供给工厂车间的视觉反馈对其他精益属性产生了积极影响。
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引用次数: 0
期刊
2015 Moratuwa Engineering Research Conference (MERCon)
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