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Articles 31 - 60 of 91
Full-Text Articles in Engineering
Optimal Power Flow Incorporating Facts Devices And Stochastic Wind Power Generation Using Krill Herd Algorithm, Arsalan Abdollahi, Ali Asghar Ghadimi, Mohammad Reza Miveh, Fazel Mohammadi, Francisco Jurado
Optimal Power Flow Incorporating Facts Devices And Stochastic Wind Power Generation Using Krill Herd Algorithm, Arsalan Abdollahi, Ali Asghar Ghadimi, Mohammad Reza Miveh, Fazel Mohammadi, Francisco Jurado
Electrical and Computer Engineering Publications
© 2020 by the authors. This paper deals with investigating the Optimal Power Flow (OPF) solution of power systems considering Flexible AC Transmission Systems (FACTS) devices and wind power generation under uncertainty. The Krill Herd Algorithm (KHA), as a new meta‐heuristic approach, is employed to cope with the OPF problem of power systems, incorporating FACTS devices and stochastic wind power generation. The wind power uncertainty is included in the optimization problem using Weibull probability density function modeling to determine the optimal values of decision variables. Various objective functions, including minimization of fuel cost, active power losses across transmission lines, emission, …
Integration Of High Voltage Ac/Dc Grids Into Modern Power Systems, Fazel Mohammadi
Integration Of High Voltage Ac/Dc Grids Into Modern Power Systems, Fazel Mohammadi
Electrical and Computer Engineering Publications
© 2020 by the author. The Special Issue on "Integration of High Voltage AC/DC Grids into Modern Power Systems" is published. A total of five qualified papers are published in this Special Issue. The topics of the papers are control, protection, operation, planning, and scheduling of high voltage AC/DC grids. Twenty-five researchers have participated in this Special Issue. We hope that this Special Issue is helpful for high voltage applications.
A Dual Approach For Positive T–S Fuzzy Controller Design And Its Application To Cancer Treatment Under Immunotherapy And Chemotherapy, Elham Ahmadi, Jafar Zarei, Roozbeh Razavi-Far, Mehrdad Saif
A Dual Approach For Positive T–S Fuzzy Controller Design And Its Application To Cancer Treatment Under Immunotherapy And Chemotherapy, Elham Ahmadi, Jafar Zarei, Roozbeh Razavi-Far, Mehrdad Saif
Electrical and Computer Engineering Publications
This study proposes an effective positive control design strategy for cancer treatment by resorting to the combination of immunotherapy and chemotherapy. The treatment objective is to transfer the initial number of tumor cells and immune–competent cells from the malignant region into the region of benign growth where the immune system can inhibit tumor growth. In order to achieve this goal, a new modeling strategy is used that is based on Takagi–Sugeno. A Takagi-Sugeno fuzzy model is derived based on the Stepanova nonlinear model that enables a systematic design of the controller. Then, a positive Parallel Distributed Compensation controller is proposed …
Integration Of Ac/Dc Microgrids Into Power Grids, Fazel Mohammadi
Integration Of Ac/Dc Microgrids Into Power Grids, Fazel Mohammadi
Electrical and Computer Engineering Publications
© 2020 by the authors. The Special Issue on "Integration of AC/DC Microgrids into Power Grids" is published. A total of six qualified papers are published in this Special Issue. The topics of the papers are the Optimal Power Flow (OPF), control, protection, and the operation of hybrid AC/DC microgrids. Nine researchers participated in this Special Issue. We hope that this Special Issue is helpful for sustainable energy applications.
Multi-Objective Optimal Reactive Power Planning Under Load Demand And Wind Power Generation Uncertainties Using Ε-Constraint Method, Amir Hossein Shojaei, Ali Asghar Ghadimi, Mohammad Reza Miveh, Fazel Mohammadi, Francisco Jurado
Multi-Objective Optimal Reactive Power Planning Under Load Demand And Wind Power Generation Uncertainties Using Ε-Constraint Method, Amir Hossein Shojaei, Ali Asghar Ghadimi, Mohammad Reza Miveh, Fazel Mohammadi, Francisco Jurado
Electrical and Computer Engineering Publications
© 2020 by the authors. This paper presents an improved multi-objective probabilistic Reactive Power Planning (RPP) in power systems considering uncertainties of load demand and wind power generation. The proposed method is capable of simultaneously (1) reducing the reactive power investment cost, (2) minimizing the total active power losses, (3) improving the voltage stability, and (4) enhancing the loadability factor. The generators' voltage magnitude, the transformer's tap settings, and the output reactive power of VAR sources are taken into account as the control variables. To solve the probabilistic multi-objective RPP problem, the "-constraint method is used. To test the effectiveness …
Numerical Study Of Roundness Effect On Flow Around A Circular Cylinder, Ran Wang, Shaohong Cheng, David S.K. Ting
Numerical Study Of Roundness Effect On Flow Around A Circular Cylinder, Ran Wang, Shaohong Cheng, David S.K. Ting
Civil and Environmental Engineering Publications
Imperfectly round bridge stay cable cross section is speculated to be a key factor for wind-induced large-amplitude cable vibrations observed on site. A delayed detached eddy simulation implemented in Open source Field Operation and Manipulation is used to investigate the flow structure around and in the near-wake of an imperfectly round circular cylinder and the corresponding aerodynamic forces at a Reynolds number of 104 and an attack angle of 0° or 45°. With the increase in roundness imperfection, both monotonic and non-monotonic changes of the mean surface pressure and the wake velocity are found when the cylinder is normal to …
Optimal Placement Of Tcsc For Congestion Management And Power Loss Reduction Using Multi-Objective Genetic Algorithm, Thang Trung Nguyen, Fazel Mohammadi
Optimal Placement Of Tcsc For Congestion Management And Power Loss Reduction Using Multi-Objective Genetic Algorithm, Thang Trung Nguyen, Fazel Mohammadi
Electrical and Computer Engineering Publications
© 2020 by the authors. Electricity demand has been growing due to the increase in the world population and higher energy usage per capita as compared to the past. As a result, various methods have been proposed to increase the efficiency of power systems in terms of mitigating congestion and minimizing power losses. Power grids operating limitations result in congestion that specifies the final capacity of the system, which decreases the conventional power capabilities between coverage areas. Flexible AC Transmission Systems (FACTS) can help to decrease flows in heavily loaded lines and lead to lines loadability improvements and cost reduction. …
Optimal Scheduling Of Large-Scale Wind-Hydro-Thermal Systems With Fixed-Head Short-Term Model, Thang Trung Nguyen, Ly Huu Pham, Fazel Mohammadi, Le Chi Kien
Optimal Scheduling Of Large-Scale Wind-Hydro-Thermal Systems With Fixed-Head Short-Term Model, Thang Trung Nguyen, Ly Huu Pham, Fazel Mohammadi, Le Chi Kien
Electrical and Computer Engineering Publications
© 2020 by the authors. In this paper, a Modified Adaptive Selection Cuckoo Search Algorithm (MASCSA) is proposed for solving the Optimal Scheduling of Wind-Hydro-Thermal (OSWHT) systems problem. The main objective of the problem is to minimize the total fuel cost for generating the electricity of thermal power plants, where energy from hydropower plants and wind turbines is exploited absolutely. The fixed-head short-term model is taken into account, by supposing that the water head is constant during the operation time, while reservoir volume and water balance are constrained over the scheduled time period. The proposed MASCSA is compared to other …
Scaling Of Incidence Variations With Inlet Distortion For A Transonic Axial Compressor, D. J. Hill, J. J. Defoe
Scaling Of Incidence Variations With Inlet Distortion For A Transonic Axial Compressor, D. J. Hill, J. J. Defoe
Mechanical, Automotive & Materials Engineering Publications
This paper numerically explores the manner in which blade row inlet incidence variation scales with various distortion patterns and intensities. The objectives are to (1) identify the most appropriate parameter whose circumferential variation can be used to assess scaling relationships of a transonic compressor and (2) use this parameter to evaluate two types of non-uniform inflow patterns, vertically stratified total pressure distortions and radially stratified total enthalpy and total pressure distortions. A body force model of the blade rows is employed to reduce computational cost; the approach has been shown to capture distortion transfer and to be able to predict …
An Improved Mixed Ac/Dc Power Flow Algorithm In Hybrid Ac/Dc Grids With Mt-Hvdc Systems, Fazel Mohammadi, Gholam Abbas Nazri, Mehrdad Saif
An Improved Mixed Ac/Dc Power Flow Algorithm In Hybrid Ac/Dc Grids With Mt-Hvdc Systems, Fazel Mohammadi, Gholam Abbas Nazri, Mehrdad Saif
Electrical and Computer Engineering Publications
© 2019 by the authors. One of the major challenges on large-scale Multi-Terminal High Voltage Direct Current (MT-HVDC) systems is the steady-state interaction of the hybrid AC/DC grids to achieve an accurate Power Flow (PF) solution. In PF control of MT-HVDC systems, different operational constraints, such as the voltage range, voltage operating region, Total Transfer Capability (TTC), transmission reliability margin, converter station power rating, etc. should be considered. Moreover, due to the nonlinear behavior of MT-HVDC systems, any changes (contingencies and/or faults) in the operating conditions lead to a significant change in the stability margin of the entire or several …
An Improved Droop-Based Control Strategy For Mt-Hvdc Systems, Fazel Mohammadi, Gholam Abbas Nazri, Mehrdad Saif
An Improved Droop-Based Control Strategy For Mt-Hvdc Systems, Fazel Mohammadi, Gholam Abbas Nazri, Mehrdad Saif
Electrical and Computer Engineering Publications
© 2020 by the authors. Licensee MDPI, Basel, Switzerland. This paper presents an improved droop-based control strategy for the active and reactive power-sharing on the large-scale Multi-Terminal High Voltage Direct Current (MT-HVDC) systems. As droop parameters enforce the stability of the DC grid, and allow the MT-HVDC systems to participate in the AC voltage and frequency regulation of the different AC systems interconnected by the DC grids, a communication-free control method to optimally select the droop parameters, consisting of AC voltage-droop, DC voltage-droop, and frequency-droop parameters, is investigated to balance the power in MT-HVDC systems and minimize AC voltage, DC …
Environmentally Conscious Machining Of Inconel 718: Surface Roughness, Tool Wear And Material Removal Rate Assessment, Sadaf Zahoor, Fahad Ameen, Walid Abdul-Kader
Environmentally Conscious Machining Of Inconel 718: Surface Roughness, Tool Wear And Material Removal Rate Assessment, Sadaf Zahoor, Fahad Ameen, Walid Abdul-Kader
Mechanical, Automotive & Materials Engineering Publications
Flood cooling is a typical strategy used in the machining of difficult-to-cut materials where high temperatures are produced.Several environmental and health concerns are associated with the cutting fluids employed during this technique. Vegetable oil-based fluids appear to be the best substitute to conventional mineral/synthetic oils due to their environmentally friendly, biode-gradable, renewable, and less toxic properties. Therefore, this paper attempts to establish an environmentally conscious, flood-cooling alternative through replacing conventional fluids with a synthetic vegetable ester-based (Mecagreen 450) biodegradableoil to investigate the machinability aspects of Inconel 718. In addition to the cooling environment, cutting speed (vs), feed pertooth (fz), and …
A New Topology Of A Fast Proactive Hybrid Dc Circuit Breaker For Mt-Hvdc Grids, Fazel Mohammadi, Gholam Abbas Nazri, Mehrdad Saif
A New Topology Of A Fast Proactive Hybrid Dc Circuit Breaker For Mt-Hvdc Grids, Fazel Mohammadi, Gholam Abbas Nazri, Mehrdad Saif
Electrical and Computer Engineering Publications
© 2019 by the authors. One of the major challenges toward the reliable and safe operation of the Multi-Terminal HVDC (MT-HVDC) grids arises from the need for a very fast DC-side protection system to detect, identify, and interrupt the DC faults. Utilizing DC Circuit Breakers (CBs) to isolate the faulty line and using a converter topology to interrupt the DC fault current are the two practical ways to clear the DC fault without causing a large loss of power infeed. This paper presents a new topology of a fast proactive Hybrid DC Circuit Breaker (HDCCB) to isolate the DC faults …
A Bidirectional Power Charging Control Strategy For Plug-In Hybrid Electric Vehicles, Fazel Mohammadi, Gholam Abbas Nazri, Mehrdad Saif
A Bidirectional Power Charging Control Strategy For Plug-In Hybrid Electric Vehicles, Fazel Mohammadi, Gholam Abbas Nazri, Mehrdad Saif
Electrical and Computer Engineering Publications
© 2019 by the authors. Plug-in Hybrid Electric Vehicles (PHEVs) have the potential of providing frequency regulation due to the adjustment of power charging. Based on the stochastic nature of the daily mileage and the arrival and departure time of Electric Vehicles (EVs), a precise bidirectional charging control strategy of plug-in hybrid electric vehicles by considering the State of Charge (SoC) of the batteries and simultaneous voltage and frequency regulation is presented in this paper. The proposed strategy can control the batteries charge which are connected to the grid, and simultaneously regulate the voltage and frequency of the power grid …
Performance Evaluation Of The Remanufacturing System Prone To Random Failure And Repair, Ronak Savaliya, Walid Abdul-Kader
Performance Evaluation Of The Remanufacturing System Prone To Random Failure And Repair, Ronak Savaliya, Walid Abdul-Kader
Mechanical, Automotive & Materials Engineering Publications
Implementation of new environmental legislation and public awareness has increased the responsibility of manufacturers. Remanufacturing has been applied in many industries and sectors since its introduction. However, only 10% to 20% of the returned products pass through the remanufacturing process, and the remaining products are disposed in the landfills. Uncertainties like high failure rates of the servers, buffer capacities, and inappropriate preventive maintenance policies would be responsible for most of the delays in remanufacturing operations. In this paper, a simulation-based experimental methodology is used to determine the optimal preventive maintenance frequency and buffer allocation in a remanufacturing line. Moreover, an …
Effect Of Yaw Angle On Flow Structure And Cross-Flow Force Around A Circular Cylinder, Ran Wang, Shaohong Cheng, David S.K. Ting
Effect Of Yaw Angle On Flow Structure And Cross-Flow Force Around A Circular Cylinder, Ran Wang, Shaohong Cheng, David S.K. Ting
Mechanical, Automotive & Materials Engineering Publications
Flow around an inclined circular cylinder at yaw angles of α = 0°, 30°, 45°, and 60° has been numerically studied using the delayed detached eddy simulation at a Reynolds number of 1.4 × 104. Periodic boundary conditions are utilized to minimize the end effect. The focus is to explore the effect of yaw angle on the flow structure and the spatial distribution of the cross-flow forces. For the normal flow case, the modulation of the span-wise averaged lift force coefficient is found to be related to the unstable shear layer. For the inclined cases, contours of the sectional lift …
Effect Of Yaw Angle On Flow Structure And Cross-Flow Force Around A Circular Cylinder, Ran Wang, Shaohong Cheng, David S.K. Ting
Effect Of Yaw Angle On Flow Structure And Cross-Flow Force Around A Circular Cylinder, Ran Wang, Shaohong Cheng, David S.K. Ting
Civil and Environmental Engineering Publications
Flow around an inclined circular cylinder at yaw angles of α = 0°, 30°, 45°, and 60° has been numerically studied using the delayed detached eddy simulation at a Reynolds number of 1.4 × 104. Periodic boundary conditions are utilized to minimize the end effect. The focus is to explore the effect of yaw angle on the flow structure and the spatial distribution of the cross-flow forces. For the normal flow case, the modulation of the span-wise averaged lift force coefficient is found to be related to the unstable shear layer. For the inclined cases, contours of the sectional lift …
Extreme Learning Machine Based Prognostics Of Battery Life, Roozbeh Razavi-Far, Shiladitya Chakrabarti, Mehrdad Saif, Enrico Zio, Vasile Palade
Extreme Learning Machine Based Prognostics Of Battery Life, Roozbeh Razavi-Far, Shiladitya Chakrabarti, Mehrdad Saif, Enrico Zio, Vasile Palade
Electrical and Computer Engineering Publications
This paper presents a prognostic scheme for estimating the remaining useful life of Lithium-ion batteries. The proposed scheme utilizes a prediction module that aims to obtain precise predictions for both short and long prediction horizons. The prediction module makes use of extreme learning machines for one-step and multi-step ahead predictions, using various prediction strategies, including iterative, direct and DirRec, which use the constant-current experimental capacity data for the estimation of the remaining useful life. The data-driven prognostic approach is highly dependent on the availability of high quantity of quality observations. Insufficient amount of available data can result in unsatisfactory prognostics. …
Simulating The Role Of Axial Flow In Stay Cable Vibrations Via A Perforated Wake Splitter Plate”, Asce Special Edition: Wind Engineering In Natural Hazards, Ran Wang, Shaohong Cheng, David S-K Ting
Simulating The Role Of Axial Flow In Stay Cable Vibrations Via A Perforated Wake Splitter Plate”, Asce Special Edition: Wind Engineering In Natural Hazards, Ran Wang, Shaohong Cheng, David S-K Ting
Mechanical, Automotive & Materials Engineering Publications
Cable-stayed bridges have become progressively popular since 1955, mainly because of their modest requirement on ground anchorage condition, efficient use of structural material, higher stiffness, and economy compared to suspension bridges. The inclined and/or yawed orientation of bridge stay cables results in the formation of secondary axial flow on the leeward side of cable surface, which is believed to be one of the contributing factors exciting some unique wind-induced cable vibration phenomena. To clarify the role of axial flow in triggering aerodynamic instability of stay cables, a numerical study has been conducted to indirectly examine the axial flow effect via …
Simulating The Role Of Axial Flow In Stay Cable Vibrations Via A Perforated Wake Splitter Plate, Ran Wang, Shaohong Cheng, David Ting
Simulating The Role Of Axial Flow In Stay Cable Vibrations Via A Perforated Wake Splitter Plate, Ran Wang, Shaohong Cheng, David Ting
Civil and Environmental Engineering Publications
The inclined and/or yawed orientation of bridge stay cables results in the formation of secondary axial flow on the leeward side of cable surface, which is believed to be one of the contributing factors exciting some unique wind induced cable vibration phenomena. To clarify the role of axial flow in triggering aerodynamic instability of stay cables, a numerical study has been conducted to indirectly examine the axial flow effect via a perforated splitter plate placed along the central line of a circular cylinder wake. By manipulating the perforation ratio of the perforated plate at four different levels, the variation of …
Fan Performance Scaling With Inlet Distortions, J. J. Defoe, E. Etemadi, D. K. Hall
Fan Performance Scaling With Inlet Distortions, J. J. Defoe, E. Etemadi, D. K. Hall
Mechanical, Automotive & Materials Engineering Publications
Applications such as boundary-layer-ingesting fans, and compressors in turboprop engines require continuous operation with distorted inflow. A low-speed axial fan with incompressible flow is studied in this paper. The objectives are to (1) identify the physical mechanisms which govern the fan response to inflow distortions and (2) determine how fan performance scales as the type and severity of inlet distortion varies at the design flow coefficient. A distributed source term approach to modeling the rotor and stator blade rows is used in numerical simulations in this paper. The model does not include viscous losses so that changes in diffusion factor …
Pricing Policies For A Dual-Channel Retailer With Cross-Channel Returns, Mohannad Hassan Radhi, Guoqing Zhang
Pricing Policies For A Dual-Channel Retailer With Cross-Channel Returns, Mohannad Hassan Radhi, Guoqing Zhang
Mechanical, Automotive & Materials Engineering Publications
Many retailers are adopting a dual-channel retailing strategy (DCRS) in which products are offered through two channels: physical stores and online stores. Due to regulations or competitive measures, such a strategy allows customers who find a purchase unsatisfactory to obtain a full refund through a same-channel return or a cross-channel return. No papers have collectively studied the aforementioned types of customer returns in a dual-channel context. This paper studies optimal pricing policies for a centralized and decentralized dual-channel retailer (DCR) with same- and cross-channel returns. How dual-channel pricing behavior is impacted by customer preference and rates of customer returns is …
Dual-Channel Warehouse And Inventory Management With Stochastic Demand, Fawzat Alawneh, Guoqing Zhang
Dual-Channel Warehouse And Inventory Management With Stochastic Demand, Fawzat Alawneh, Guoqing Zhang
Mechanical, Automotive & Materials Engineering Publications
This study examines the inventory policy for the emerging dual-channel warehouse, which has a unique structure where the warehouse is divided into two areas: one for fulfilling online orders and the other for storing products and fulfilling offline orders. A multi-item inventory model was developed considering the warehouse capacity constraint, demand, and lead time uncertainty. Solution methods are provided for both uniform and normal distributions. Adopting the proposed inventory policy for a dual warehouse is cost effective and adds flexibility to the warehouse and supply chain. The study also offers managerial insights on some critical issues faced by companies operating …
Solution Deposition Of Conformal Gold Coatings On Knitted Fabric For E-Textiles And Electroluminescent Clothing, Tricia Carmichael, Yunyun Wu, Sara S. Mechael, Yiting Chen
Solution Deposition Of Conformal Gold Coatings On Knitted Fabric For E-Textiles And Electroluminescent Clothing, Tricia Carmichael, Yunyun Wu, Sara S. Mechael, Yiting Chen
Chemistry and Biochemistry Publications
The vision for wearable electronics involves creating an imperceptible boundary between humans and devices. Integrating electronic devices into clothing represents an important path to this vision; however, combining conductive materials with textiles is challenging due to the porous structure of knitted textiles. Stretchability depends on maintaining the void structure between the yarns of the fabric; filling these voids with conductive materials stiffens the textile and can lead to detrimental cracking. The authors demonstrate the solution-based metallization of a knitted textile that conformally coats individual fibers with gold, leaving the void structure intact. The resulting gold-coated textile is highly conductive, with …
Energy Efficiency And Economic Feasibility Of An Absorption Air-Conditioning System Using Wet, Dry And Hybrid Heat Rejection Methods, Julia Aman, Paul Henshaw, David S-K Ting
Energy Efficiency And Economic Feasibility Of An Absorption Air-Conditioning System Using Wet, Dry And Hybrid Heat Rejection Methods, Julia Aman, Paul Henshaw, David S-K Ting
Mechanical, Automotive & Materials Engineering Publications
In tropical and sub-tropical regions, air-conditioning systems account for the greatest electricity consumption and high water use. Solar-driven absorption cooling systems can conveniently reduce electricity consumption at need. The performance of this cooling system depends on the system’s heat rejection. A simulation was performed for a 15 kW single effect ammonia-water absorption cooling system driven by low temperature thermal energy and with three different heat rejection methods (wet cooling, dry cooling, and hybrid cooling). This hybrid cooling system uses wet cooling on the absorber and dry cooling on the condenser. The system performance and economics of the chiller with these …
Bubble-Pump-Driven Libr-H2o And Licl-H2o Absorption Air-Conditioning Systems, Julia Aman, Paul Henshaw, David S-K Ting
Bubble-Pump-Driven Libr-H2o And Licl-H2o Absorption Air-Conditioning Systems, Julia Aman, Paul Henshaw, David S-K Ting
Mechanical, Automotive & Materials Engineering Publications
A thermally-driven bubble pump, powered by solar or waste heat energy, is a simple and efficient technique for lifting a liquid from lower to higher levels, after which it can flow by gravity. In this study, solar thermal driven pumps were incorporated in the solar collector as well as in the refrigerant cycle to provide a design of an air-conditioning system for a residential home that is independent of grid electricity. The crystallization challenge, low pressure, and low efficiency are the main downsides of bubble-pump-driven LiBr-H2O refrigeration systems, in comparison with other bubble-pump-driven diffusion absorption refrigeration systems. Therefore, a complete …
Performance Evaluation Of Reverse Logistics Enterprise – An Agent-Based Simulation Approach, Gowtham Ravi Sankara Pandian, Walid Abdul-Kader
Performance Evaluation Of Reverse Logistics Enterprise – An Agent-Based Simulation Approach, Gowtham Ravi Sankara Pandian, Walid Abdul-Kader
Industrial and Manufacturing Systems Engineering Publications
Reverse logistics (RL) has been applied in many industries and sectors since its conception. Unlike forward logistics, retracing consumer goods from the point of consumption to the point of inception is not a well-studied process. It involves many uncertainties such as time, quality and quantity of returns. The returned products can be remanufactured, have parts harvested, or be disposed safely. It is important to implement these activities in a cost-effective manner. The aim of this research is to measure the performance of the RL enterprise with the help of an agent-based simulation model. The major entities in the RL network …
Digit-Level Serial-In Parallel-Out Multiplier Using Redundant Representation For A Class Of Finite Fields, Parham Hosseinzadeh Namin, Roberto Muscedere, Majid Ahmadi
Digit-Level Serial-In Parallel-Out Multiplier Using Redundant Representation For A Class Of Finite Fields, Parham Hosseinzadeh Namin, Roberto Muscedere, Majid Ahmadi
Electrical and Computer Engineering Publications
Two digit-level finite field multipliers in F2m using redundant representation are presented. Embedding F2m in cyclotomic field F2(n) causes a certain amount of redundancy and consequently performing field multiplication using redundant representation would require more hardware resources. Based on a specific feature of redundant representation in a class of finite fields, two new multiplication algorithms along with their pertaining architectures are proposed to alleviate this problem. Considering area-delay product as a measure of evaluation, it has been shown that both the proposed architectures considerably outperform existing digit-level multipliers using the same basis. It is …
Simultaneous Measurement Of Refractive Index And Thickness Of Multilayer Systems Using Fourier Domain Optical Coherence Tomography, Part 2: Implementation, Payman Rajai
Mechanical, Automotive & Materials Engineering Publications
We introduce a theoretical method for simultaneous measurement of refractive index and thickness of multilayer systems using Fourier domain optical coherence tomography (FD-OCT) without any auxiliary arrangement. The input data to the formalism are the FD-OCT measured optical path lengths (OPLs) and properly selected spectral components of FD-OCT interference spectrum. The outputs of the formalism can be affected significantly by uncertainty in measuring the OPLs. An optimization method is introduced to deal with the relatively large amount of uncertainty in measured OPLs and enhance the final results. Simulation result shows that by using the optimization method, indices can be extracted …
Simultaneous Measurement Of Refractive Index And Thickness Of Multilayer Systems Using Fourier Domain Optical Coherence Tomography, Part 1: Theory, Payman Rajai
Mechanical, Automotive & Materials Engineering Publications
We introduce a theoretical framework for simultaneous refractive index and thickness measurement of multilayer systems using the Fourier domain optical coherence tomography (FD-OCT) system without any previous information about the item under investigation. The input data to the new formalism are the FD-OCT measured optical path lengths and properly selected spectral components of the FD-OCT interference spectrum. No additional arrangement, reference reflector, or mechanical scanning is needed in this approach. Simulation results show that the accuracy of the extracted parameters depends on the index contrast of the sample while it is insensitive to the sample’s thickness profile. For transparent biological …