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2020 3rd International Conference on Computing, Mathematics and Engineering Technologies (iCoMET)最新文献

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Construction of the Exact Solution of Ripa Model with Primitive Variable Approach 用原始变量法构造Ripa模型的精确解
Sidrah Ahmed
The exact solution of the Riemann problem associated to Ripa model is constructed. A primitive variable formulation of the model is used instead of conserved variable formulation. This lead to establish the solutions to Riemann problem without calculating the flux terms. The closed form solution is obtained in the case of all rarefaction wave. The phase plane curves and corresponding characteristics curves have been plotted for different cases including rarefaction waves and shock waves connecting left and right known states. Many numerical methods for solving nonlinear hyperbolic conservation laws are based on conserved variable formulation, hence the conversion from primitive to conserved variables is required within algorithm. This method gives direct calculation of the exact solution in primitive variable formulation of the model. This method can be effectively applied to design more robust numerical solvers for hyperbolic conservation laws.
构造了Ripa模型相关的Riemann问题的精确解。该模型采用原始变量公式代替保守变量公式。这就建立了不计算通量项的黎曼问题的解。得到了全稀疏波情况下的闭型解。绘制了不同情况下的相平面曲线和相应的特性曲线,包括稀疏波和激波连接左右已知状态。求解非线性双曲型守恒律的许多数值方法都是基于守恒变量的形式,因此在算法中需要从原始变量到守恒变量的转换。该方法直接计算了模型原始变量表达式的精确解。该方法可有效地应用于双曲型守恒律的数值求解。
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引用次数: 0
A Review on Hybrid Energy Storage Systems in Microgrids 微电网混合储能系统研究进展
Yameena Tahir, M. Nadeem, A. Ahmed, I. Khan, Farhan Qamar
Energy storages have numerous benefits, for instance, improvement of generation and demand balance, power quality and intermittency of renewable resources. Presently, available energy storage systems (ESS) are inadequate to achieve the desired applications on their own. Hybrid energy storage systems (HESSs) are featured by the combination of two or more energy storage technologies to accomplish the desired results. This paper gives an overview of HESSs applications in microgrids (MGs). Initially, benefits and applications of hybridization have been discussed. Then, a brief comparison of capacity sizing for HESSs is presented. The reviewed methodologies have significant implication in defining HESS capacity in MGs, while considering several constraints such as storage life span, cost and efficiency.
能源储存有许多好处,例如,改善发电和需求平衡,电力质量和可再生资源的间歇性。目前,可用的储能系统(ESS)本身不足以实现预期的应用。混合储能系统(hess)的特点是结合两种或两种以上的储能技术来实现预期的结果。本文综述了hess在微电网中的应用。首先,讨论了杂交的优点和应用。然后,简要比较了hess的容量大小。在考虑诸如存储寿命、成本和效率等几个限制条件的同时,所审查的方法对定义mg中的HESS容量具有重要意义。
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引用次数: 12
Extending The Scrum to Introduce The Concept of Systematic Reusability 扩展Scrum以引入系统可重用性的概念
A. Kiani, Y. Hafeez, M. Aqib, Sadia Ali, Javaria Javed, Nosheen Anwar
Agile Software Development (ASD) and Software Reusability are successful approaches in software engineering. ASD promises customer feedback, quick iterations, onsite customer relationship and also accommodates changes even after development. On the other hand, software reuse helps the organizations to deal with software complexity by systematic reuse, fast response to customers’ expectations and demands, reduced time to market, and increased productivity and quality. We believe that introduction of systematic reusability in ASD will improve the development process and it will be beneficial for organizations in achieving their short term and long term goals. Although few approaches have been proposed to address this issue but the scope of those studies is limited. In this work, we therefore, have proposed an approach to extend the most used agile method scrum to introduce the concept of systematic reusability. To support our idea and for the validation purpose, we have conducted control experiments. Experiment results prove overall performance of proposed approach.
敏捷软件开发(ASD)和软件可重用性是软件工程中成功的方法。ASD承诺客户反馈、快速迭代、现场客户关系,甚至在开发后也能适应变化。另一方面,软件重用通过系统重用、对客户期望和需求的快速响应、缩短上市时间以及提高生产力和质量来帮助组织处理软件复杂性。我们相信,在ASD中引入系统的可重用性将改善开发过程,并且对组织实现其短期和长期目标都是有益的。虽然提出的解决这一问题的方法很少,但这些研究的范围是有限的。因此,在这项工作中,我们提出了一种方法来扩展最常用的敏捷方法scrum,以引入系统可重用性的概念。为了支持我们的想法和验证目的,我们进行了控制实验。实验结果证明了该方法的总体性能。
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引用次数: 2
Effort Estimation Problems in Software Maintenance – A Survey 软件维护中的工作量估算问题综述
Syed Sarmad Ali, Muhammad Shoaib Zafar, Muhammad Tallal Saeed
The software industry has been evolving over the years. Software maintenance is as crucial as software development. Software maintenance cost has gained a significant important both for practitioners and researchers. Software maintenance cost is very crucial to estimate the productivity of the software, reliability, adaptability, and control. This research investigation is a study that is based on the literature of investigation conducted previously in the field of software maintenance. We have found studies that reveal the effort estimation problems related and have a direct impact on software maintenance. We have also identified problems that have a direct impact on software maintenance. This study will act as a guideline for researchers to counter these problems. This study will act as a platform to classify new direction and initiate full-scale research.
多年来,软件行业一直在不断发展。软件维护和软件开发一样重要。软件维护成本已经引起了实践者和研究者的极大关注。软件维护成本对于评估软件的生产力、可靠性、适应性和可控制性至关重要。本研究调查是基于以前在软件维护领域进行的调查文献进行的研究。我们已经发现了一些研究,这些研究揭示了与软件维护相关并对其有直接影响的工作量评估问题。我们还确定了对软件维护有直接影响的问题。这项研究将作为研究人员应对这些问题的指导方针。本研究将作为分类新方向及展开全面研究的平台。
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引用次数: 9
IOT based Smart Industrial panel for controlling Three-phase Induction motor 基于物联网的智能工业面板,用于控制三相感应电机
Engr. Ghulam Abid, Engr. Shoaib Ahmed Shaikh, Engr. Muhammad Fawad Shaikh, Engr. Sara Hafeez Rajput, Engr. Umar Abdul Majeed, Engr. Abdul Majeed Shaikh
Technology has been developing throughout the world as system moved from manual to auto. This paper is on the smart control panel for controlling the appliances. Appliances are Inductive, resistive and capacitive in nature. Inductive type are mostly motors. Three-phase Induction motor is one of the most common types of electrical machines with vast amount of applications in the entire power system all over the world due to its various advantages such as low starting power, lower maintenance cost etc. For the sake of economy and their longer life, it is very much necessary to provide them with feasible conditions to perform optimal operation with best possible smart protection techniques, this paper is all about the analysis of faults in induction motor on MATLAB/SIMULINK, the provision of optimal protection combining traditional and IOT for both automatic as well as manual method to make it fully controllable based on the requirements of protection engineer for various loads. Control elements used here are vibration as well temperature sensation with IOT based remote data acquisition technique for automatic protection as well as a manual control using a selector switch for automatic as well as manual operation and a molded case circuit breaker for protection purpose.
随着系统从手动转向自动,世界各地的技术也在不断发展。本文是关于控制电器的智能控制面板。器具本质上有电感式、电阻式和电容式。感应型主要是电动机。三相异步电动机由于具有起动功率小、维护成本低等优点,在世界范围内的整个电力系统中有着广泛的应用,是一种最常见的电机类型。从经济和延长使用寿命的角度出发,为其提供可行的条件,以最佳的智能保护技术进行优化运行是非常必要的,本文主要是通过MATLAB/SIMULINK对异步电动机的故障进行分析,结合传统和物联网的方法,对自动和手动两种方法进行优化保护,并根据保护工程师对各种负载的要求,使其完全可控。这里使用的控制元件是振动和温度感应,采用基于物联网的远程数据采集技术进行自动保护,以及使用选择开关进行自动和手动操作的手动控制,以及用于保护目的的模制外壳断路器。
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引用次数: 8
Thermodynamic investigation of R744 and R134a based refrigeration cycle 基于R744和R134a制冷循环的热力学研究
F. Akhtar, M. Sultan
The present work is an investigation of refrigerating cycles and the compressors work for R134a and CO2/R744 refrigerants. Relative demonstration conferred has been peculiarly created design for small cooling capacities and an evaporation temperature. An accurate numerical feigning miniature for compressors work performance has been used to numerically collate both R134a and R744 based compressor prototypes. To validate the detailed numerical simulation of the thermal and fluid dynamic behavior of single stage vapor compression refrigerating unit has been developed and utilized. The numerical outcomes obtained from the thermodynamic investigation reveals a satisfactory agreement, while the relative global values indicate resembling efficiencies under the identical working conditions. Compare is made between R744 and R134a as a refrigerant to pick up heat at −17.7°C and reject at 60°C. R744 requires significantly higher pressures and results in higher temperature from compressor and have lower coefficient of performance. Thermodynamic calculations are done with REFPROP software.
本文对R134a和CO2/R744制冷剂的制冷循环和压缩机的工作进行了研究。相对的论证已经特别创建了小冷却能力和蒸发温度的设计。利用压缩机工作性能的精确数值模拟微型机对R134a和R744压缩机样机进行了数值校核。为了验证单级蒸汽压缩制冷机组的热力和流体动力学特性,开发并应用了详细的数值模拟。热力学研究的数值结果显示了令人满意的一致性,而相对全局值表明在相同的工作条件下相似的效率。对比R744和R134a作为制冷剂,在- 17.7℃下吸热,60℃下排热。R744需要更高的压力,导致压缩机温度更高,性能系数更低。热力学计算用REFPROP软件完成。
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引用次数: 0
ATM Cash Prediction Using Time Series Approach 用时间序列方法预测ATM现金
Muhammad Rafi, Mohammad Taha Wahab, Muhammad Bilal Khan, Hani Raza
One of the main challenges in today’s banking industry is to forecast the cash demand of their ATM network. Each ATM must be filled with the right amount so that neither a customer’s transaction is rejected because of out-of-cash status, nor the idle cash ruins the opportunity for the bank to earn profit on it. This paper proposed a time-series model for forecasting the cash demands of each ATM in a network of ATMs for a specific financial institution. Using the transaction data of each ATM we build a Vector Auto Regressive Moving Average with Exogenous Variable model (VAR-MAX) for each ATM. We compared our proposed approach with one recently proposed Recurrent Neural Network (RNN) approach termed as Long-Short Term Memory(LSTM) which was reported to performed best for this problem. Our proposed model using the exogenous variable performed better than this model. The study used a dataset comprises of transaction of 7 ATMs from the period of June 2013 to December 2015 from some of the financially busy areas of Karachi Pakistan. The Symmetric Mean Absolute Percentage Error (SMAPE) is used to reports evaluation from the experiments.
当今银行业面临的主要挑战之一是预测其ATM网络的现金需求。每台ATM机都必须填满适量的现金,这样客户的交易既不会因为现金不足而被拒绝,也不会因为现金闲置而破坏银行从中获利的机会。本文提出了一个时间序列模型,用于预测某金融机构ATM网络中每台ATM的现金需求。利用每台ATM机的交易数据,建立了带有外生变量的向量自回归移动平均模型(VAR-MAX)。我们将我们提出的方法与最近提出的一种称为长短期记忆(LSTM)的递归神经网络(RNN)方法进行了比较,据报道LSTM方法在这个问题上表现最好。我们提出的使用外生变量的模型比这个模型表现得更好。该研究使用的数据集包括2013年6月至2015年12月期间巴基斯坦卡拉奇一些金融繁忙地区的7台自动柜员机的交易。对称平均绝对百分比误差(SMAPE)用于报告实验结果的评价。
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引用次数: 15
Chaotic Inertia Weight Particle Swarm Optimization (CIWPSO): An Efficient Technique for Solar Cell Parameter Estimation 混沌惯性权重粒子群算法:一种有效的太阳能电池参数估计方法
Arooj Tariq Kiani, M. Faisal Nadeem, A. Ahmed, I. A. Sajjad, A. Raza, I. Khan
Solar cell modeling and optimal estimation of their associated parameters is a key point to improve performance of PV solar system. Recently, different numerical, analytical and hybrid approaches have been developed for parameter extraction of PV model. In this paper the Chaotic Inertia Weight Particle Swarm Optimization (CIWPSO) technique is proposed to estimate PV parameters of single and double diode. Furthermore, the Newton Raphson method (NRM) is employed to guide the fitness indicator towards optimal solution. The propose approach solves the premature convergence problem of the conventional PSO. This new approach is implemented on RTC France Silicon Solar cell, under standard test conditions (STC). CIWPSO has ability to find optimal solution with the requirement of relatively less computational time and number of iterations. The validity of results clearly supports the statement that, the proposed approach is highly accurate, efficient and fast for parameter estimation of PV cells.
太阳能电池的建模及其相关参数的优化估计是提高光伏太阳能系统性能的关键。近年来,针对PV模型的参数提取,提出了不同的数值方法、解析方法和混合方法。本文提出了混沌惯性加权粒子群优化(CIWPSO)技术来估计单二极管和双二极管的PV参数。然后,利用Newton Raphson方法(NRM)将适应度指标导向最优解。该方法解决了传统粒子群算法的早熟收敛问题。在标准测试条件下,在RTC法国硅太阳能电池上实现了这种新方法。CIWPSO能够以相对较少的计算时间和迭代次数找到最优解。结果的有效性清楚地支持了该方法对光伏电池参数估计的准确性、有效性和快速性。
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引用次数: 14
Sensitivity and Design Point Analysis of RD-93 Engine at Static Sea Level using Numerical Propulsion System Simulation 基于数值推进系统仿真的RD-93发动机静海平面灵敏度及设计点分析
Maria Sadaf, M. K. Zeb, S. Salamat, Messam Naqvi
The design and prototyping of jet engines is an extremely costly and laborious task. An alternative to at this is the development of variants of existing engines for enhanced performance which requires detailed modeling of engine in mathematical environment for precise evaluation of performance parameters. This paper presents mathematical modelling and sensitivity analysis of performance of RD-93, a low bypass turbofan engine, towards design parameters including pressure ratio of turbomachinery components, bypass ratio and critical temperatures. The effect of varying the efficiency of engine components on performance of overall engine is estimated using numerical environment of Numerical Propulsion System Simulation (NPSS). The results of performed analysis can serve as a guide for further parametric cycle analyses of low bypass turbofan engines.
喷气发动机的设计和原型制作是一项极其昂贵和费力的任务。另一种替代方法是开发现有发动机的变体,以增强性能,这需要在数学环境中对发动机进行详细建模,以精确评估性能参数。本文建立了RD-93型低涵道比涡扇发动机的数学模型,并对涡轮部件压力比、涵道比和临界温度等设计参数进行了性能敏感性分析。利用数值推进系统仿真(NPSS)的数值环境,估计了发动机各部件效率变化对发动机整体性能的影响。分析结果可为进一步进行低涵道比涡扇发动机参数循环分析提供指导。
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引用次数: 1
iCoMET 2020 Table of Contents iCoMET 2020目录
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引用次数: 0
期刊
2020 3rd International Conference on Computing, Mathematics and Engineering Technologies (iCoMET)
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