Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 39 for “"OPF"”.
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Development of biodegradable, biomimetic hydrogels modulating cellular function for guided bone regeneration
A novel oligo(poly(ethylene glycol) fumarate) (OPF) was synthesized and used to prepare a biodegradable and biomimetic crosslinked network covalently modified with bioactive peptides for guided bone regeneration. First, we examined the cytotoxicity of each component of the OPF hydrogel formulation …
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Estimation of LRD present in H.264 video traces using wavelet analysis and proving the paramount of H.264 using OPF technique in wi-fi environment.
… approach called Optimal Packet Fragmentation (OPF) is framed and the H.264 coded sequences are tested in the wireless simulated environment. This research has three major studies involved in it. First part of the research has the study about Long Range Dependence (LRD) and the ways by which the …
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Development of thermally-crosslinked hydrogels as injectable cell carriers for orthopaedic tissue engineering
… based on oligo(poly(ethylene glycol) fumarate) (OPF) were developed and characterized as injectable cell carriers for orthopaedic tissue engineering. Through alteration of the poly(ethylene glycol) molecular weight used in the synthesis of the OPF macromer, swelling and mechanical properties of …
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Strengthening QC relaxations of optimal power flow problems by exploiting various coordinate changes
… studies the AC optimal power flow (AC OPF) problem. An AC OPF problem optimizes a specified objective function subject to constraints imposed by both the non-linear power flow equations and engineering limits. The difficulty of an AC OPF problem is strongly connected to its feasible …
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Fast optimal power flow analysis for large-scale smart grid
Optimal power flow OPF plays an important role in power system operation. The emerging smart grid aims to create an automated energy delivery system that enables two-way flows of electricity and information. As a result, it will be desirable if OPF can be solved in real time in order to allow the …
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Optimal power flow using a genetic algorithm and linear algebra
… economically. The optimal power flow problem (OPF) problem is an optimization problem, in which the utility strives to minimize its costs while satisfying all of its constraints. A genetic algorithm (GA)---a specific type of artificial intelligence-is employed to perform this optimization. To …
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Controlled growth factor delivery from biodegradable hydrogel scaffolds for articular cartilage repair
The use of oligo(poly(ethylene glycol) fumarate) (OPF) hydrogels as carriers of growth factors for articular cartilage repair has been investigated. In vitro release studies examined release of transforming growth factor-beta1 (TGF-beta1) directly from OPF hydrogels and also from gelatin …
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Voltage Unbalance-Cognizant Optimization of Distribution Grids
… To combat this, a novel Optimal Power Flow (OPF) is designed to help operate these resources in a manner that curtails voltage unbalance using the reactive power compensation capabilities of inverters. The OPF was run for a wide variety of loading conditions on a pair of systems using MATLAB …
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Chemical characterisation of the volatile constituents of essential oil from Commiphora Wildii (Omumbiri) resin
… for perfume. The Opuwo Processing Facility (OPF) is currently producing Omumbiri essential oil which they supply to companies in Namibia, South Africa, Germany and France. However, most of their products are sold in Southern Africa, and supply outweighs the demand. OPF is currently working on …
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AC Optimal Power Flow for Physically and Economically Informed Grid Decarbonization
… formulation known as DC Optimal Power Flow (DC OPF). Results from DC OPF are not implementable, requiring feasibility checks and adjustments from AC power flow analysis. Current methodologies do not guarantee convergence, feasibility, or robustness, and they rely heavily on operator knowledge …
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A proximal atomic coordination algorithm for distributed optimization in distribution grids
… grids, a problem called Optimal Power Flow (OPF). Using a convex relaxed variant of OPF, we show that PAC exhibits sub-linear convergence to the optimal ergodic cost, and linear convergence to the OPF solution. We demonstrate our results on various power grid topologies with large levels of …
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Opportunistic Packet Forwarding for Proactive Transport in Datacenters
… evaluation of Opportunistic Packet Forwarding (OPF), a building block for proactive transports designed to minimize pre-credit packet losses with negligible overhead on network switches. The key idea in OPF is to allow pre-credit packets to opportunistically take detours to avoid congested links …
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Optimal coordination of distributed energy resources in smart grids enabled by distributed optimization and transactive energy
… algorithms in solving the optimal power flow (OPF) problem, when a large number of small scale DERs are present. The OPF problem minimizes costs to operate the grid, while subject to network constraints. The distributed implementation makes large-scale problems computationally tractable, while …
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Statistical Analysis of Electric Energy Markets with Large-Scale Renewable Generation Using Point Estimate Methods
… (PEMs) are applied to the optimal power flow (OPF) problem to estimate the statistical moments of the locational marginal prices (LMPs) and total generation cost under system uncertainty. An extensive mathematical examination and risk analysis of existing PEMs are performed and a new PEM scheme …
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High-performance computing for smart grid analysis and optimization
… efficiency and reliability. Optimal power flow (OPF) plays an important role in power system operation. The emerging smart grid aims to create an automated energy delivery system that enables two-way flows of electricity and information. As a result, it will be desirable if OPF can be solved in …
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Synthetic Hydrogel Delivery of Growth Factors and Demineralized Bone Matrix for Bone Augmentation
… based on oligo(poly(ethylene glycol) fumarate) (OPF) were prepared to investigate the effect of gelatin amount, gelatin type, and BMP-2 loading phase on release. The most significant factor affecting the release of BMP-2 was the loading phase, whereby gelatin loading reduced the burst release and …
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Robust stability assessment for future power systems
… technique for constructing Optimal Power Flow (OPF) feasibility (convex) subsets. For any inner point of the subset, the power flow problem is guaranteed to have a feasible solution which satisfies all the operational constraints considered in the corresponding OPF. This inner approximation …
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Modeling and Analysis of Voltage Feasibility Problems for Cost-Effective Microgrids
… using Alternating Current Optimal Power Flow (AC-OPF). The results of this thesis show the limits of feasible reactive power support from distributed PV units on a utility disconnected microgrid based on our voltage constraints. The study shows that there exists a limit to reactive power support …
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Bridging Machine Learning for Smart Grid Applications
… of repetitively solving optimal power flow (OPF) for a large number of system states. Machine learning-based approaches have been used to avoid solving OPF in composite system reliability evaluation except in the training stage. However, current approaches have been utilized only to classify …
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Synthesis and characterization of matrix metalloproteinase sensitive hydrogels for articular cartilage engineering
… of extracellular matrix. Various formulations of OPF and crosslinker concentration were used to form the crosslinked hydrogels employed in the studies, and degradation and swelling of the hydrogels were analyzed. The differentiation stage of and the extracellular matrix production by marrow …
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