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Construction engineering is considered as a complex network system project. By analyzing the relationship of construction costs and reliability in engineering project, a mathematical model is established to optimize the costs and genetic algorithm (GA) is used for this purpose. In the application of GA, penalty function is used to handle the constraint. Ranking based on the evaluation function and...
We present a scene depth map generation method based on light field cameras. From the plenoptic function, the angular information about each image point under different sizes of aperture is extracted, which could be used for confocal stereo. Considering confocal constancy and gradient constancy, we take into account two constraints: (1) When a pixel is in focus, its relative intensities across aperture...
A comparative analysis between well established and more recent solid state power amplifier (SSPA) combining techniques is presented. Based on this analysis, a new Figure of Merit (FOM) methodology is presented that can form part of a process to optimise SSPA design within the constraints of service, technology and performance requirements. Also, this formalises the process of determining the most...
Smart secondary substations (S/S) play a vital role in advanced Distribution automation system (ADAS) in order to achieve self-healing grid and improve the reliability level of medium voltage (MV) distribution networks. However, the main challenges with ADAS is the determination of the optimal automation level. This is a non-linear discrete optimization problem with multi-dimensions. Thus, it is not...
A modified hybrid imperfect maintenance model (MHIM) for machine working in piecewise constant operational condition (PCOC) is proposed considering the limitation of traditional age-based hybrid imperfect maintenance model, with the assumption that failure time in different operational condition (OC) satisfies accelerated failure time model (AFTM). Method for estimating the parameters also has been...
This paper presents a new approach to obtain an optimal energy management in Smart Grids from both generation and demand sides where generation and demand units collaborate with others in a distributed manner to simultaneously obtain their optimal powers that maximize the total welfare in the grid. The proposed approach is developed based on an optimization method called Alternating Direction Method...
While renewable generation sources provide many economic and environmental benefits for the operation of power systems, their inherent stochastic nature introduces challenges from the perspective of reliability. Existing optimal power flow (OPF) methods must therefore be extended to consider forecast errors to mitigate in an economic manner the uncertainty that renewable generation introduces. This...
Urban transport systems are often not capable to satisfy the numerous needs of urban mobility. Therefore, in recent years great interest has been given in Cooperative Intelligent Transportation Systems (C-ITS), which via two-way communication between road participants and infrastructure allow new solutions addressing transport problems. However, if efficiency improvements only target general traffic,...
This paper presents an optimal sizing study of a stand-alone hybrid PV/wind energy system (HPWES)with battery storage. The main objective of the optimization is minimization of the total system cost while satisfying the reliability constraint and maintaining the healthy charge on the battery. A relatively new optimization technique, pigeon inspired optimization (PIO) has been used to optimize the...
The fault current at a particular node in microgrid system varies depending upon its grid connected and islanded mode of operations. In this scenario microgrid the function of microgrid central protection unit becomes challenging to maintain its simplicity and reliability during protection coordination. To make protection system more reliable and to minimize complexity and dependency of central adaptive...
Energy efficient and reliable spectrum sensing become essential in cooperative cognitive radio networks. However, cooperation in spectrum sensing (SS) is often vulnerable to several security threats; one such operation is primary user emulation attack (PUEA). To address the issues, an optimization framework is developed in this work to minimize the energy consumption in cooperative spectrum sensing...
In the last decade, NAND flash-based SSDs have been widely adopted for high-end enterprise systems in an attempt to provide a high-performance and reliable storage. However, inferior performance is frequently attained mainly due to the need for Garbage Collection (GC). GC in flash memory is the process of identifying and clearing the blocks of unneeded data to create space for the new data to be allocated...
Present paper computes the interval-valued reliability of an engineering system in the context of the value of state performance. In this study, we have evaluated the interval-valued reliability of a 2-out-of-4 system with the help of reliability function. The considered model of 2-out-of-4 system consists of 2 numbers of components connected in series. The interval universal generating function technique...
The aim of this work is to propose a formal model for determining the dynamic optimal path for transfer operations on an oil flow network within real conditions of exploitation such as maintenance activities and alignments in-service. The study focuses on a multi-objective problem to search a safe and short path to the oil transfer operations. It is based on, firstly, dynamic reliability, that depends...
In view of the influence of smart meter's reliability on smart grid, this paper presents a reliability prediction optimal model of smart meter. Firstly, establish the reliability model of smart meter based on the component stress method. Secondly, combined with the field data, smart meter prediction model is established based on new Weibull distribution parameter method and point estimation method...
Power Park comprised of multiple modular microgrids exhibits advantages including: better control flexibility, higher scalability, higher reliability, etc. The energy management system (EMS) of the Power Park can be divided into three layers, namely, converter layer, microgrid module layer and Power Park layer. In order to realize system control objectives in different layers, Beaglebone Black (BBB)...
Inferring dense depth from stereo is crucial for several computer vision applications and Semi Global Matching (SGM) is often the preferred choice due to its good tradeoff between accuracy and computation requirements. Nevertheless, it suffers of two major issues: streaking artifacts caused by the Scanline Optimization (SO) approach, at the core of this algorithm, may lead to inaccurate results and...
This paper presents a methodology to determine the optimal distribution system feeder reconfiguration and distributed generation placement simultaneously, and is optimal in that the system reliability is maximized. An important consideration of optimal distribution system feeder reconfiguration is the effect of the variable output of intermittent resources. The work presented in this paper considers...
The growing interest on RES gives traditional power systems an opportunity to evolve towards more sustainable and environmental entities, however the viability of RES would induce stability and reliability issues in power systems. In this paper, a DC optimal power flow (OPF) algorithm considering the worst-case scenario is proposed. It accounts for uncertainties brought by loads and renewable energy...
In this paper, the size optimization of standalone Photovoltaic (PV)/Wind turbine hybrids system for water pumping in Sirte City, Libya are compared using HOMER Pro, HOMER Beta, and iHOGA softwares, specifically the cost of energy (COE), total net present cost (NPC), and size of the system. Various loads of water pumping for farm land are used. The optimal system suggested by iHOGA had the lowest...
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