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Data-driven Distributionally Adjustable Robust Chance-constrained DG Capacity Assessment

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Journal of Modern Power Systems and Clean Energy 2024年第1期12卷 115-127页

作者： Masoume Mahmoodi Seyyed Mahdi Noori rahim Abadi Ahmad Attarha Paul Scott Lachlan Blackhall the College of Engineering and Computer Science The Australian National UniversityCanberraAustralia

Moving away from fossil fuels towards renewable sources requires system operators to determine the capacity of distribution systems to safely accommodate green and distributed generation(DG).However,the DG capacity of a distribution system is often underestimated due to either overly conservative electrical demand and DG output uncertainty modelling or neglecting the recourse capability of the available *** improve the accuracy of DG capacity assessment,this paper proposes a distributionally adjustable robust chance-constrained approach that utilises uncertainty information to reduce the conservativeness of conventional robust *** proposed approach also enables fast-acting devices such as inverters to adjust to the real-time realisation of uncertainty using the adjustable robust counterpart *** achieve a tractable formulation,we first define uncertain chance constraints through distributionally robust conditional value-at-risk(CVaR),which is then reformulated into convex quadratic *** subsequently solve the resulting large-scale,yet convex,model in a distributed fashion using the alternating direction method of multipliers(ADMM).Through numerical simulations,we demonstrate that the proposed approach outperforms the adjustable robust and conventional distributionally robust approaches by up to 15%and 40%,respectively,in terms of total installed DG capacity.

关键词： Distributed generation(DG)capacity assessment distributionally robust optimisation chance-constrained optimisation distribution system

An Approximate Method for the Surge Response of the Tension Leg Platform

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Journal of Marine Science and Application 2014年第1期13卷 99-104页

作者： rahim Shoghi Mohammad Reza Tabeshpour Faculty of Civil Engineering Tabriz University Center of Excellence in Hydrodynamics and Dynamics of Marine Vehicles Mechanical Engineering DepartmentSharif University of Technology

The solution for the Duffing equation in a nonlinear vibration problem is studied in this paper. Clearly, in the case of the perturb parameter being a larger value, the traditional perturbation method is no longer valid but the Homotopy Perturbation Method(HPM) is applicable *** is used to solve the weak and strong nonlinear differential equations for finding the perturbed frequency of the response. The obtained frequencies via HPM and the approximate method have good accordance for weak and strong nonlinear differential equations. Additionally, the calculated responses by use of the approximate method are compared with the responses obtained from the Numerical method in the time history of the response and phase *** results represent good accordance between them.

关键词： Duffing equation nonlinear vibration surgeresponse tension leg platform perturbation differentialequations

Crystallization kinetics of overlapping phases in Se70Te15Sb15 using isoconversional methods

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Progress in Natural Science:Materials International 2015年第2期25卷 169-177页

作者： M.A.Abdel-rahim M.M.Hafiz A.Z.Mahmoud Physics Department Faculty of ScienceAssiut University Assiut 71516 Egypt

The crystallization kinetics of Se70Te15Sb15 chalcogenide glass was studied by Differential Scanning Calorimetry(DSC) under non-isothermal conditions. This glass was found to have a double glass transition and double overlapped crystalline phases. The overlapped crystalline phases were successfully separated using the Gaussian fit model. The activation energy, Ec, and Avrami index, n, were determined by analyzing the data using the Matausita et. al. method. A strong heating rate depending on the activation energy for the two crystalline peaks was observed. The results indicated that the transformation from amorphous to crystalline phases is a complex process involving different mechanisms of nucleation and growth. The variation of activation energy with crystalline fraction was determined by Kissenger–Akahira–Sunose(KAS) method. The obtained results of directly fitting the experimental DSC data to the calculated DSC curves indicated that the crystallization process of Se70Te15Sb15 glass cannot be satisfactorily described by the Johnson–Mehl–Avrami(JMA) model. Simulation results indicated that the Sestak–Berggren(SB) model is more suitable to describe the crystallization process for the studied glass. The crystalline phases for the two events were identified by using x-ray diffraction(XRD) and scanning electron microscopy(SEM).

关键词： Chalcogenides glasses Differential Scanning Calorimetry(DSC) Electron Microscopy X-ray diffraction

Hyper-Tuned Convolutional Neural Networks for Authorship Verification in Digital Forensic Investigations

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Computers, Materials & Continua 2023年第8期76卷 1947-1976页

作者： Asif rahim Yanru Zhong Tariq Ahmad Sadique Ahmad Mohammed A.ElAffendi School of Computer and Information Security Guilin University of Electronic TechnologyGuilin541004China Guangxi Key Laboratory of Intelligent Processing of Computer Images and Graphics Guilin University of Electronic TechnologyGuilin541004China School of Information and Communication Guilin University of Electronic TechnologyGuilin541004China EIAS:Data Science and Blockchain Laboratory College of Computer and Information SciencesPrince Sultan UniversityRiyadh11586Saudi Arabia

Authorship verification is a crucial task in digital forensic investigations,where it is often necessary to determine whether a specific individual wrote a particular piece of *** Neural Networks(CNNs)have shown promise in solving this problem,but their performance highly depends on the choice of *** this paper,we explore the effectiveness of hyperparameter tuning in improving the performance of CNNs for authorship *** conduct experiments using a Hyper Tuned CNN model with three popular optimization algorithms:Adaptive Moment Estimation(ADAM),StochasticGradientDescent(SGD),andRoot Mean Squared Propagation(RMSPROP).The model is trained and tested on a dataset of text samples collected from various authors,and the performance is evaluated using accuracy,precision,recall,and F1 *** compare the performance of the three optimization algorithms and demonstrate the effectiveness of hyperparameter tuning in improving the accuracy of the CNN *** results show that the Hyper Tuned CNN model with ADAM Optimizer achieves the highest accuracy of up to 90%.Furthermore,we demonstrate that hyperparameter tuning can help achieve significant performance improvements,even using a relatively simple model architecture like *** findings suggest that the choice of the optimization algorithm is a crucial factor in the performance of CNNs for authorship verification and that hyperparameter tuning can be an effective way to optimize this ***,this paper demonstrates the effectiveness of hyperparameter tuning in improving the performance of CNNs for authorship verification in digital forensic *** findings have important implications for developing accurate and reliable authorship verification systems,which are crucial for various applications in digital forensics,such as identifying the author of anonymous threatening messages or detecting cases of plagiarism.

关键词： Convolutional Neural Network(CNN) hyper-tuning authorship verification digital forensics

Geochemical Assessment and Lateral Reservoir Continuity of Asmari Reservoir Oils in the Cheshmeh-Khush Oilfield,SW Iran

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Acta Geologica Sinica(English Edition) 2020年第5期94卷 1562-1573页

作者： Farid TEZHEH Bijan BEIRANVAND Hormuz GHALAVAND Mohammad Reza KAMALI rahim BAGHERI TIRTASHI Research Institute of the Petroleum Industry(RIPI) TehranIran Deputy of Development and Engineering National Iranian Oil Company(NIOC)TehranIran Geochemistry Department Exploration DirectorateNational Iranian Oil Company(NIOC)TehranIran

A total of 6 oil samples were systematically selected from six Asmari Reservoir wells in the Cheshmeh-Khush Oilfield for geochemical evaluation of the hydrocarbon system,based on reservoir geochemistry and oil *** investigation of the distribution patterns of normal alkanes and tricyclic and tetracyclic terpanes along with characteristic biomarkers of the depositional environment and sedimentary facies,indicated that the source rock of the studied hydrocarbons was deposited in a reducing aquatic environment with a low input of terrigenous material and predominantly carbonate lithology derived from organic algal *** studied oil samples exhibited moderate maturity,as was further confirmed by the parameters extracted from the light *** clustering based on different biomarker parameters indicated the presence of two oil ***,the application of branched and cyclic compounds in the light hydrocarbons(C5–C11)to evaluate lateral continuity of the Asmari reservoir further supported the presence of the two oil *** evidence proved the presence of a NE–SW trending fault separating wells X5 and X6 from the other wells in the *** other wells across the field,good lateral reservoir continuity was observed,despite the presence of faults on the northern and southern plunges of the structure.

关键词： oil fingerprint lateral continuity Asmari Reservoir petroleum families Cheshmeh-Khush Oilfield

Feature extraction of overlapping hevea leaves:A comparative study

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Information Processing in Agriculture 2018年第2期5卷 234-245页

作者： Sule T.Anjomshoae Mohd Shafry Bin Mohd rahim Department of Software Engineering Faculty of ComputingUniversiti Teknologi Malaysia81310 SkudaiJohor BahruMalaysia

Automation of rubber tree clone classification has inspired research into new methods of leaf feature *** current practice,rubber clone inspectors has been using several leaf features to identify clone *** of the unique features of rubber tree leaf is palmate *** characteristic generates different leaflet positions,where the leaves are overlapping or *** this research,we propose keypoint extraction and line detection methods to extract shape and axil(angle between petioles)features of leaflet *** results of keypoint extraction methods,namely,SIFT,Harris,and FAST,were compared and discussed for shape feature ***,Hough transformation and boundary-tracing methods were compared to identify the suitable axil detection *** evaluation result demonstrates the proper keypoint extraction method for shape context and the clear advantages of Hough Transformation in accuracy of angle detection.

关键词： Rubber tree leaves Feature extraction SIFT Harris FAST Hough transformation Boundary extraction

Assessing the techno-economic feasibility of hybrid solar-hydrogen systems: A review of recent studies

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iEnergy 2024年第1期3卷 28-38页

作者： Emmanuel Akono Sarsah Albert Kojo Sunnu Abdul-rahim Bawa Mechanical Engineering Department Dr.Hilla Limann Technical UniversityWaGhana Department of Mechanical Engineering Kwame Nkrumah University of Science and TechnologyKumasiGhana

Transition toward a sustainable,low-carbon energy future requires innovative,integrated *** solar-hydrogen systems(HSHSs),which combine solar energy harvesting and hydrogen production,have excellent prosepects to address challenges related to renewable energy generation,storage,and *** article presents an overview of the research on the technical and economic feasibility of HSHSs,aimed at comprehensively articulating their current state,notable advancements,and future research *** begins by elucidating solar energy principles and conversion methods and emphasizing the potential of solar energy for hydrogen *** study then explores the definitions,components,and synergistic integration of *** energy conversion and storage methods for efficient hydrogen production and storage are also *** study reviews the techniques employed for techno-economic evaluations over the last six years,addressing challenges such as the intermittency of solar energy and the efficiency of hydrogen production *** review of the ongoing research provides helpful insights into the technological and economic feasibility of *** underscores the necessity of continuous research and development efforts to overcome existing challenges and unlock their full *** systems can play a vital role in achieving a cleaner and more resilient energy future by optimizing the system performance,reducing costs,and fostering supportive policy frameworks.

关键词： Hybrid solar-hydrogen systems techno-economic feasibility solar energy hydrogen production renewable energy integration

Secure degrees of freedom for general MIMO interference channel under rank-deficiency

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The Journal of China Universities of Posts and Telecommunications 2023年第3期30卷 65-77页

作者： Wang Qiang Zhang Yijia Zhang Tianjiao Zhang Wenqi Gao Yue Tafazolli rahim School of Information and Communication Engineering Beijing University of Posts and TelecommunicationsBeijing 100876China School of Cyberspace Security Beijing University of Posts and TelecommunicationsBeijing 100876China The Institute for Communication Systems University of SurreyGU27XHUK

As a more trackable performance metric for secrecy capacity,the secure degrees of freedom(SDoF)are widely studied for most multiuser networks in the high signal to noise ratio(SNR)***,the SDoF for these networks under rank-deficiency and arbitrary antenna configurations have not yet been *** this paper,the SDoF of two-user general multiple-input multiple-output(MIMO)interference channel with confidential messages(ICCM)under rank-deficiency are *** the two-user rank-deficient MIMO ICCM,the model is generalized to fully asymmetric settings,where the transmitters and receivers are equipped with arbitrary *** outer bound of SDoF is the union of three outer bounds that are based on the Fano’s inequality and the secrecy constraints,the secrecy penalty lemma and the role of a helper lemma,and the transmitters cooperation,*** SDoF region is subdivided into five regions according to the number of transceivers antennas,and each region has an achievability scheme with designed null space transmission and alignment *** results indicate that the SDoF increase at first and then decrease as the rank of the channel matrix *** SDoF improve by increasing the transmitting antenna or reducing receiving antenna,but the effect of the transmitting antenna is greater.

关键词： confidential messages interference channel multiple-input multiple-output(MIMO) rank-deficient secure degrees of freedom(SDoF)

Mathematics of dengue transmission dynamics:Roles of vector vertical transmission and temperature fluctuations

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Infectious Disease Modelling 2018年第1期3卷 266-292页

作者： rahim Taghikhani Abba B.Gumel School of Mathematical and Statistical Sciences Arizona State UniversityTempeAZUSA

A new deterministic model is designed and used to gain insight into the effect of seasonal variations in temperature and vector vertical transmission on the transmission dynamics of dengue *** model,which incorporates(among many other features)the dynamics of the immature dengue-competent mosquitoes,vertical transmission in the vector population,density-dependent larval mortality and temperature effects,is rigorously analysed and simulated using data relevant to the disease dynamics in Chiang Mai province of *** non-trivial disease-free equilibrium of the model is shown to be globallyasymptotically stable when the associated basic reproduction number of the model is less than *** simulations of the model,using data relevant to the disease dynamics in the Chiang Mai province of Thailand,show that vertical transmission in the vector population has only marginal impact on the disease dynamics,and that the effect of vertical transmission is temperature-dependent(in particular,the effect of vertical transmission on the disease dynamics increases for values of the mean monthly temperature in the range[16-28]℃,and decreases with increasing mean monthly temperature thereafter).It is further shown that dengue burden(as measured in terms of disease incidence)is maximized when the mean monthly temperature is in the range[26-28]℃(and dengue burden decreases for mean monthly temperature values above 28℃).Thus,this study suggests that anti-dengue control efforts should be intensified during the period when this temperature range is recorded in the Chiang Mai province(this occurs between June and August).

关键词： Dengue Vertical transmission Temperature Stability Reproduction number