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Predicting pavement condition index based on the utilization of machine learning techniques:A case study

道路工程学报(英文) 2023年第3期3卷 266-278页

作者： Abdualmtalab Abdualaziz Ali Abdalrhman milad Amgad Hussein Nur Izzi Md Yusoff Usama Heneash Department of Civil Engineering Faculty of Engineering and Applied ScienceMemorial UniversitySt.John'sNL A1B1T5Canada Department of Civil Engineering Faculty of EngineeringAzzaytuna UniversityTarhunaLibya Department of Civil and Environmental Engineering College of EngineeringUniversity of NizwaNizwaOman Department of Civil Engineering Universiti Kebangsaan MalaysiaBangi 43600Malaysia Department of Civil Engineering Faculty of EngineeringKafrelsheikh UniversityKafr El-SheikhEgypt

Pavement management systems(PMS)are used by transportation government agencies to promote sustainable development and to keep road pavement conditions above the minimum performance levels at a reasonable *** accomplish this objective,the pavement condition is monitored to predict deterioration and determine the need for maintenance or rehabilitation at the appropriate *** pavement condition index(PCI)is a commonly usedmetric to evaluate the pavement's *** research aims to create and evaluate prediction models for PCI values using multiple linear regression(MLR),artificial neural networks(ANN),and fuzzy logic inference(FIS)models for flexible pavement *** authors collected field data spans for 2018 and *** pavement distress factors were considered inputs for predicting PCI values,such as rutting,fatigue cracking,block cracking,longitudinal cracking,transverse cracking,patching,potholes,and *** study evaluates the performance of the three techniques based on the coefficient of determination,root mean squared error(RMSE),and mean absolute error(MAE).The results show that the R2 values of the ANN models increased by 51.32%,2.02%,36.55%,and 3.02%compared toMLR and FIS(2018 and 2021).The error in the PCI values predicted by the ANNmodel was significantly lower than the errors in the prediction by the FIS and MLR models.

关键词： Pavement condition index Pavement distresses Machine learning Artificial neural network Multiple linear regression

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Ankle Fractures, Short Term Operative Outcome: A Retrospective Case Series

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Open Journal of Orthopedics 2023年第1期13卷 1-22页

作者： Faisal Mahmud milad Elmosrati Orthopedics and Traumatology Department Tripoli Central Hospital Tripoli Libya

Introduction and Background: Ankle injury is one of the most frequent presenting injuries to the emergency room and ankle fractures are common fracture in the lower limbs injuries that may require operative treatment with variable outcomes. Materials and Methods: Sixty-three patients were included in my retrospective study, and all with a displaced fracture of the ankle caused by high energy trauma were treated by open reduction and rigid internal fixation. Results: After follow-up at six weeks and twelve weeks, the results were satisfactory in fifty-five percent out of all the sixty-three patients. Conclusions and Recommendations: Ankle fractures occur mainly in young males of the age group between 26 and 35 years, mostly caused by fall down and motor vehicle accident.

关键词： Ankle Fractures AO Classification Short Term Follow-Up

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基于瞬时产量递减分析确定天然裂缝性油藏平均地层压力

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石油勘探与开发 2015年第2期42卷 229-232页

作者： Daryasafar Amin Amareh Iman Fathi Nasab Mohammad Kharrat Riyaz Jalilian milad 伊朗石油科技大学石油工程学院

以Warren和Root等提出的裂缝-孔隙双重介质模型为基础,拓展延伸了Mavor、Cinco-Ley和Daprat等的裂缝系统拟稳态-定产量生产的解及基质系统拟稳态-定压力生产的解,提出了根据天然裂缝性油藏定压开采的瞬时产量递减准确估算油藏平均压力... 详细信息

以Warren和Root等提出的裂缝-孔隙双重介质模型为基础,拓展延伸了Mavor、Cinco-Ley和Daprat等的裂缝系统拟稳态-定产量生产的解及基质系统拟稳态-定压力生产的解,提出了根据天然裂缝性油藏定压开采的瞬时产量递减准确估算油藏平均压力的新方法。具体方法为:分别将基质产量方程和裂缝产量方程两端取自然对数,得到两条直线;再利用其斜率和截距确定弹性储容比、油藏总储容以及泄油面积,最后确定平均地层压力。经算例和实例验证,新方法简单实用,与物质平衡法和Tiab直接合成技术法得到的估算结果十分接近。

关键词：天然裂缝性油藏平均地层压力不稳定试井递减曲线分析双重介质拟稳态流动

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Permissible Stress Level of Brick Masonry under Compressive Cyclic Loading

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Journal of Civil Engineering and Architecture 2013年第2期7卷 153-157页

作者： milad Mahmoud Alshebani Department of Civil Engineering University of Tripoli Tripoli 00001 Libya

Laboratory tests revealed that the behavior of brick masonry under compressive cyclic loading is characterized by three distinct stress-strain curves. These three curves are termed as envelope curve, common point curve and stability point curve. The envelope curve is obtained by superimposing the cyclic peaks on the monotonic stress-strain curve. The common point curve is the locus of intersection points of loading and unloading curves of the cycles. If for the same cycle, the loading and unloading are repeated several times, the intersection points of loading and unloading paths will stabilize at a lower bound. The locus of these stabilized points （lower bound points） of all cycles form the stability point curve. Therefore, the stability point curve can be used as a measure for the allowable stress for masonry under cyclic loadings. The proposed cyclic allowable stress level is associated with the accumulation of residual （plastic） strain levels as a result of cyclic loading history. The permissible stress level was found to be about two thirds of the cyclic peak stress of the specimen.

关键词： Cyclic loadings permissible stress residual strain stability point.

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Failure Mode and Effects Analysis （FMEA） by Fuzzy Data Envelop Analysis （Fuzzy-DEA）

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Journal of Mathematics and System Science 2014年第3期4卷 173-179页

作者： Hamed Rahmani milad Jasemi Department of Industrial Management Islamic Azad University Qazvin Iran. Department of Industrial Engineering K.N. Toosi University of Technology Tehran Iran.

Failure mode and effects analysis （FMEA） offers a quick and easy way for identifying ranking-order for all failure modes in a system or a product. In FMEA the ranking methods is so called risk priority number （RPN）, which is a mathematical product of severity （S）, occurrence （0）, and detection （D）. One of major disadvantages of this ranking-order is that the failure mode with different combination of SODs may generate same RPN resulting in difficult decision-making. Another shortfall of FMEA is lacking of discerning contribution factors, which lead to insufficient information about scaling of improving effort. Through data envelopment analysis （DEA） technique and its extension, the proposed approach evolves the current rankings for failure modes by exclusively investigating SOD in lieu of RPN and to furnish with improving *** for SOD. The purpose of present study is to propose a state-of-the-art new approach to enhance assessment capabilities of failure mode and effects analysis （FMEA）. The paper proposes a state-of-the-art new approach, robust, structured and useful in practice, for failure analysis.

关键词： Failure mode and effects analysis (FMEA) data envelopment analysis (DEA) risk priority number (RPN).

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Transient thermal response of micro-thermal conductivity detector (μTCD) for the identification of gas mixtures:An ultra-fast and low power method

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Microsystems & Nanoengineering 2015年第1期1卷 52-58页

作者： Alireza Mahdavifar milad Navaei Peter J.Hesketh Melvin Findlay Joseph R.Stetter Gary W.Hunter School of Mechanical Engineering Georgia Institute of TechnologyAtlantaGA 30332USA KWJ Engineering Inc. NewarkCA 94560USA NASA Glenn Research Center ClevelandOH 44135USA

Micro-thermal conductivity detector(μTCD)gas sensors work by detecting changes in the thermal conductivity of the surrounding medium and are used as detectors in many applications such as gas chromatography *** TCDs use steady-state resistance(i.e.,temperature)measurements of a *** this work,we developed a new measurement method and hardware configuration based on the processing of the transient response of a low thermal mass TCD to an electric current *** method was implemented for a 100-μm-long and 1-μm-thick micro-fabricated bridge that consisted of doped polysilicon conductive film passivated with a 200-nm silicon nitride *** resistance variations of theμTCD in response to a square current pulse were studied in multiple mixtures of dilute gases in *** and experimental results are presented and compared for the time resolved and steady-state regime of the sensor *** analysis and simulation show that the sensor response is exponential in the transient state,that the time constant of this exponential variation was a linear function of the thermal conductivity of the gas ambient,and that the sensor was able to quantify the mixture *** level of detection in nitrogen was estimated to be from 25 ppm for helium to 178 ppm for carbon *** this novel approach,the sensor requires approximately 3.6 nJ for a single measurement and needs only 300μs of sampling *** is less than the energy and time required for steady-state DC measurements.

关键词： gas sensor MEMS micro-bridge micro-heater μTCD thermal conductivity sensor transient heat transfer modeling

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A Review of the Dynamic Modeling Approaches for Characterizing Fluid Flow in Naturally Fractured Reservoirs

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Energy Engineering 2021年第4期118卷 761-795页

作者： M.N.Tarhuni W.R.Sulaiman M.Z.Jaafar M.milad A.M.Alghol School of Chemical and Energy Engineering Universiti Teknologi MalaysiaSkudaiJohor81310Malaysia

Fluid flow in fractured media has been studied for decades and received considerable attention in the oil and gas industry because of the high productivity of naturally fractured *** to formation complexity and reservoir heterogeneity,characterizing fluid flow with an appropriate reservoir model presents a challenging task that differs relatively from homogeneous conventional reservoirs in many aspects of view,including geological,petrophysical,production,and *** most fractured reservoirs,fracture networks create complex pathways that affect hydrocarbon flow,well performance,hence reservoir characterization.A better and comprehensive understanding of the available reservoir modeling approaches is much needed to accurately characterize fluid flow behavior in ***,in this paper,a perspective review of the available modeling approaches was presented for fluid flow characterization in naturally fractured *** methods were evaluated in terms of their description,application,advantages,and *** study has also included the applications of these reservoir models in fluid flow characterizing studies and governing equations for fluid *** continuum models were proved to be better than single continuum models in the presence of large scale *** comparison,discrete models were more appropriate for reservoirs that contain a smaller number of ***,hybrid modeling was the best method to provide accurate and scalable fluid flow *** is our understanding that this paper will bridge the gap between the fundamental understanding and application of NFRs modeling approaches and serve as a useful reference for engineers and researchers for present and future applications.

关键词： Naturally fractured reservoirs simulation techniques fluid flow modeling heterogeneity dual continuum modeling discrete fracture network modeling

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Control and Implementation of Single-Inverter Microgrid

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Smart Grid and Renewable Energy 2019年第2期10卷 29-41页

作者： Mehdi Moradian milad Moradian Roham Sanat Engineering Co. Tehran Iran

In this paper, simulation and implementation way for practical control of Single Inverter Microgrid (SIMG) is presented. This system is equipped by solar system, wind energy conversion system (WECS), and microturbine system. Each DG’s has controlled independently. This is a kind of decentralize control because each DG’s has difference controller. Control of Microgrid (MG) during both grid tie and islanding modes is presented. Solar system and WECS are modeled based on santerno products. This system is compared with three inverter MGs with Centralize control strategy. Controlled signals show that SIMG is more reliable and economical. THD is improved and strategy is simplified for SIMG.

关键词： Single Inverter Microgrid Solar System Wind Energy Conversion System Microturbine Buck and Boost Chopper

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Numerical and experimental investigation to design a novel morphing airfoil for performance optimization

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Propulsion and Power Research 2023年第1期12卷 83-103页

作者： Kiumars Khani Aminjan Maryam Ghodrat milad Heidari Pooyan Rahmanivahid Shayan Naghdi Khanachah Mira Chitt Juan Pablo Escobedo-Diaz Faculty of Aerospace Malek Ashtar University of TechnologyTehran 1774-15875Iran School of Engineering and Information Technology University of New South Wales CanberraCanberraACT 2610Australia Mechanical Engineering Department Global College of Engineering and Technology(GCET)P.O.Box 2546 CPO Ruwi 112MuscatSultanate of Oman School of Industrial Engineering Iran University of Science and TechnologyTehran 16846-13114Iran

Optimizing flying objects’wing performance has attracted a significant attention in the last few *** this article,some of the main mechanisms for changing the geometry of the wing were investigated and a new mechanism is proposed to improve the aerodynamic performance of the airplane *** designs have been simulated and analyzed from both aerodynamic and control points of *** aerodynamic simulations using CFD methods,two airfoils of NACA series 6 with specifications 65-212 and 65-2012 were *** results indicated that both airfoils used have a better performance compared to others in a certain range of the angle of ***,a new mechanism is proposed to change the wing geometry to optimize its *** the proposed mechanism,the structures of airfoils and wings consist of two fixed and moving parts,which can change their geometry with the help of a control *** fixed part has a grooved track,and as the moving part moves in the direction of the grooves,the curvature of the upper and lower parts of the wing *** design control circuit includes an angle sensor,a micro controller,and a *** CFD results are entered into the micro controller as *** any moment,the micro controller receives the angle data from the angle sensor and by comparing them with the CFD data,and issuing a command to the servomotor,it situates the wing curvature in the optimal state at all *** built mechanism was tested at an attack angle of 0°and 25°.The results showed that the different parts of the mechanism work with very high precision and put the geometric shape of the wing in an optimal state in a completely intelligent *** should be noted that the average error in test for t/c and Xt/c was 15.3% and 9%,respectively.

关键词： Morphing airfoil Lift force Optimization Computational fluid dynamics Micro controller Angle sensor

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Incidence and risk factors of retinopathy of prematurity and utility of the national screening criteria in a tertiary center in Iran

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International Journal of Ophthalmology(English edition) 2019年第8期12卷 1330-1336页

作者： milad Khorshidifar Homayoun Nikkhah Alireza Ramezani Morteza Entezari NarsisDaftarian Hamid Norouzi Mansoor Shahiari Mitra Radfar Ramin Norinia Saeed Karimi Clinical Research Development Unit of Torfe Medical Center Shahid Beheshti University of Medical SciencesTehran***Iran Department of Ophthalmology Imam Hossein HospitalShahid Beheshti University of Medical SciencesTehran***Iran Ophthalmic Research Center Shahid Beheshti University ofMedical SciencesTehran16666Iran Ophthalmic Epidemiology Research Center Shahid BeheshtiUniversity of Medical SciencesTehran16666Iran

AIM: To determine the incidence and risk factors of retinopathy of prematurity(ROP) and the sensitivity of current screening criteria in a tertiary eye center in Tehran, Iran. METHODS: In a cross-sectional observational study, neonates weighing ≤2000 grams at birth or born <34 wk gestational age(GA) and all other infants at risk of ROP admitted to the neonatal intensive care unit(NICU) or referred to our ROP clinic were investigated. The incidence of ROP and severe ROP(i.e. patients needing treatment) were determined. The associations between risk factors and the development and severity of ROP were assessed. We also examined the sensitivity of the current national screening guideline in Iran. RESULTS: Among 207 infants, the incidence of ROP and severe ROP was 33.3% and 11.1%, respectively. Mean GA and birth weight(BW) were significantly lower in ROP vs non-ROP infants(29±2 wk vs 33±3 wk, P<0.001;1274±489 g vs 1916±550 g, P<0.001, respectively). Univariate analysis displayed significant association between ROP incidence and GA, BW, NICU admission period, blood transfusion, surfactant usage, sepsis, intraventricular hemorrhage and patent ductus arteriosus(P<0.05 for all). BW [relative risk(RR): 0.857(0.711-0.873), P<0.001], GA [RR: 0.788(0.711-0.873), P<0.001] and blood transfusion [RR: 1.888(0.995-3.583), P=0.052] were independent ROP risk factors. The sensitivity of country-specific screening guidelines was 95.7% and 100% for overall and severe ROP detection, respectively. CONCLUSION: ROP incidence is relatively high in Iran. Identifying ROP risk factors results in more accurate screening and reduces the risk of irreversible vision loss. The ROP screening criteria utilized in Iran are efficient at the present time.

关键词： retinopathy of prematurity incidence risk factors screening Iran

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