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All Articles in Controls and Control Theory

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The Design Of Efficiently-Encodable Rate-Compatible Ldpc Codes, Jaehong Kim, Aditya Ramamoorthy, Steven W. McLaughlin 2017 Samsung Electronics

The Design Of Efficiently-Encodable Rate-Compatible Ldpc Codes, Jaehong Kim, Aditya Ramamoorthy, Steven W. Mclaughlin

Aditya Ramamoorthy

We present a new class of irregular low-density parity-check (LDPC) codes for moderate block lengths (up to a few thousand bits) that are well-suited for rate-compatible puncturing. The proposed codes show good performance under puncturing over a wide range of rates and are suitable for usage in incremental redundancy hybrid-automatic repeat request (ARQ) systems. In addition, these codes are linear-time encodable with simple shift-register circuits. For a block length of 1200 bits the codes outperform optimized irregular LDPC codes and extended irregular repeat-accumulate (eIRA) codes for all puncturing rates 0.6~0.9 (base code performance is almost the same ...


On The Multiple-Unicast Capacity Of 3-Source, 3-Terminal Directed Acyclic Networks, Shurui Huang, Aditya Ramamoorthy 2017 Iowa State University

On The Multiple-Unicast Capacity Of 3-Source, 3-Terminal Directed Acyclic Networks, Shurui Huang, Aditya Ramamoorthy

Aditya Ramamoorthy

We consider the multiple-unicast problem with three source–terminal pairs over directed acyclic networks with unit-capacity edges. The three – pairs wish to communicate at unitrate via network coding. The connectivity between the – pairs is quantified by means of a connectivity-level vector, such that there exist edge-disjoint paths between and . In this paper, we attempt to classify networks based on the connectivity level. It can be observed that unit-rate transmission can be supported by routing if , for all . In this paper, we consider connectivity-level vectors such that . We present either a constructive linear network coding scheme or an instance of a ...


Minimum Cost Mirror Sites Using Network Coding: Replication Versus Coding At The Source Nodes, Shurui Huang, Aditya Ramamoorthy, Muriel Medard 2017 Iowa State University

Minimum Cost Mirror Sites Using Network Coding: Replication Versus Coding At The Source Nodes, Shurui Huang, Aditya Ramamoorthy, Muriel Medard

Aditya Ramamoorthy

Content distribution over networks is often achieved by using mirror sites that hold copies of files or portions thereof to avoid congestion and delay issues arising from excessive demands to a single location. Accordingly, there are distributed storage solutions that divide the file into pieces and place copies of the pieces (replication) or coded versions of the pieces (coding) at multiple source nodes. We consider a network which uses network coding for multicasting the file. There is a set of source nodes that contains either subsets or coded versions of the pieces of the file. The cost of a given ...


Overlay Protection Against Link Failures Using Network Coding, Ahmed Kamal, Aditya Ramamoorthy, Long Long, Shizheng Li 2017 Iowa State University

Overlay Protection Against Link Failures Using Network Coding, Ahmed Kamal, Aditya Ramamoorthy, Long Long, Shizheng Li

Aditya Ramamoorthy

This paper introduces a network coding-based protection scheme against single and multiple link failures. The proposed strategy ensures that in a connection, each node receives two copies of the same data unit: one copy on the working circuit, and a second copy that can be extracted from linear combinations of data units transmitted on a shared protection path. This guarantees instantaneous recovery of data units upon the failure of a working circuit. The strategy can be implemented at an overlay layer, which makes its deployment simple and scalable. While the proposed strategy is similar in spirit to the work of ...


Minimum Cost Distributed Source Coding Over A Network, Aditya Ramamoorthy 2017 Iowa State University

Minimum Cost Distributed Source Coding Over A Network, Aditya Ramamoorthy

Aditya Ramamoorthy

This work considers the problem of transmitting multiple compressible sources over a network at minimum cost. The aim is to find the optimal rates at which the sources should be compressed and the network flows using which they should be transmitted so that the cost of the transmission is minimal. We consider networks with capacity constraints and linear cost functions. The problem is complicated by the fact that the description of the feasible rate region of distributed source coding problems typically has a number of constraints that is exponential in the number of sources. This renders general purpose solvers inefficient ...


An Achievable Region For The Double Unicast Problem Based On A Minimum Cut Analysis, Shurui Huang, Aditya Ramamoorthy 2017 Iowa State University

An Achievable Region For The Double Unicast Problem Based On A Minimum Cut Analysis, Shurui Huang, Aditya Ramamoorthy

Aditya Ramamoorthy

We consider the multiple unicast problem under network coding over directed acyclic networks when there are two source-terminal pairs, s1-t1 and s2-t2. The capacity region for this problem is not known; furthermore, the outer bounds on the region have a large number of inequalities which makes them hard to explicitly evaluate. In this work we consider a related problem. We assume that we only know certain minimum cut values for the network, e.g., mincut(Si, Tj), where Si ⊆ {s1, s2} and Tj ⊆ {t1, t2} for different subsets Si and Tj. Based on these values, we propose an achievable rate ...


A Study Of The Reduction Of Excessive Energy Generated By Strong Winds On Power Lines Via A Velocity Damping Controller At The Transmission Tower, Donald W. Fincher Jr. 2017 Kent State University - Kent Campus

A Study Of The Reduction Of Excessive Energy Generated By Strong Winds On Power Lines Via A Velocity Damping Controller At The Transmission Tower, Donald W. Fincher Jr.

Undergraduate Research Symposium

In this research, we are pursuing the robustness of a self-excited vibrational system with negative damping. In practice, this is manifested as conductor galloping of overhead power lines, which is an oscillation of the lines caused by strong winds. Improved transmission tower designs are needed which are capable of combating excessive stresses exerted on the tower by the galloping power lines. Our model of this self-excited system shows that the oscillations can be controlled by adding a boundary velocity feedback controller at the transmission tower. Using a decomposition method, we show there is a closed form analytical solution which predicts ...


P26. Global Exponential Stabilization On So(3), Soulaimane Berkane 2017 sberkane@uwo.ca

P26. Global Exponential Stabilization On So(3), Soulaimane Berkane

Western Research Forum

Global Exponential Stabilization on SO(3)


Real-Time Sensing And Control Of Developing Weld Penetration Through Reflection Vibration In Gtaw, Jinsong Chen 2017 University of Kentucky

Real-Time Sensing And Control Of Developing Weld Penetration Through Reflection Vibration In Gtaw, Jinsong Chen

Theses and Dissertations--Electrical and Computer Engineering

GTAW (Gas Tungsten Arc Welding) weld pool surface is believed to contain sufficient information to determine the weld penetration, from which skilled welders are able to control the welding process to desired penetration states. However, it is unclear how human welders extract the weld penetration from the observed weld pool surface. In this research, a novel method is studied to determine the weld penetration based on the dynamic change of the weld pool surface.

This study observes/measures/analyzes the development of a weld pool from partial to full penetration and correlates such change to the weld penetration. Similar trends ...


Active Management Assistant System For Embry-Riddle Ecocar 3 Hybrid Supervisory Control System, Matthew Nelson, Blair Cutting, Michael J. Aleardi 2016 Embry-Riddle Aeronautical University

Active Management Assistant System For Embry-Riddle Ecocar 3 Hybrid Supervisory Control System, Matthew Nelson, Blair Cutting, Michael J. Aleardi

Student Works

The Embry-Riddle EcoCAR 3 team is developing a prototype hybrid Chevrolet Camaro utilizing a customized vehicle powertrain controller. This controller is serving to ensure system safety, vehicle operation, and consumer drivability while also incorporating advanced driving aids to achieve both the desired performance levels one expects from a Camaro as well as vehicle efficiency. This vehicle must reach the team set vehicle technical specifications of a 4.9 second 0 to 60 time while maintaining a 53 miles per gallon gasoline equivalence rating.

In order to reach the efficiency goal, the team is developing an Active Management Assistance System utilizing ...


Investigation Of Model Predictive Control (Mpc) For Steam Generator Level Control In Nuclear Power Plants, Ahmad Taemiriosgouee 2016 The University of Western Ontario

Investigation Of Model Predictive Control (Mpc) For Steam Generator Level Control In Nuclear Power Plants, Ahmad Taemiriosgouee

Electronic Thesis and Dissertation Repository

The capabilities and potential of Model Predictive Control (MPC) based strategies for steam generator level (SGL) controls in nuclear power plants (NPPs) have been investigated. The performance has been evaluated for all operating conditions that also include start-ups, low power operations and load rejections. These evaluations have been done for MPC controllers based on existing advanced methodologies, as well as for any potential performance improvement that can be achieved by fine tuning some of the parameters (based on the characteristics of the SGL) of the existing MPC approaches.

Two version of MPC have been designed and implemented. The Standard MPC ...


Development Of Instrumentation And Control Systems For An Integral Large Scale Pressurized Water Reactor, Matthew Rowland Morrow Lish 2016 University of Tennessee, Knoxville

Development Of Instrumentation And Control Systems For An Integral Large Scale Pressurized Water Reactor, Matthew Rowland Morrow Lish

Doctoral Dissertations

Small and large scale integral light water reactors are being developed to supply electrical power and to meet the needs of process heat, primarily for water desalination. This dissertation research focuses on the instrumentation and control of a large integral inherently safe light water reactor (designated as I2S-LWR) which is being designed as part of a grant by the U.S. Department of Energy Integrated Research Project (IRP). This 969 MWe integral pressurized water reactor (PWR) incorporates as many passive safety features as possible while maintaining competitive costs with current light water reactors. In support of this work ...


Data Predictive Control For Peak Power Reduction, Achin Jain, Madhur Behl, Rahul Mangharam 2016 University of Pennsylvania

Data Predictive Control For Peak Power Reduction, Achin Jain, Madhur Behl, Rahul Mangharam

Real-Time and Embedded Systems Lab (mLAB)

Decisions on how best to optimize today's energy systems operations are becoming ever so complex and conflicting such that model-based predictive control algorithms must play a key role. However, learning dynamical models of energy consuming systems such as buildings, using grey/white box approaches is very cost and time prohibitive due to its complexity. This paper presents data-driven methods for making control-oriented model for peak power reduction in buildings. Specifically, a data predictive control with regression trees (DPCRT) algorithm, is presented. DPCRT is a finite receding horizon method, using which the building operator can optimally trade off peak power ...


Reconstruction Of In-Plane Strain Maps Using Hybrid Dense Sensor Network Composed Of Sensing Skin, Austin R.J. Downey, Simon Laflamme, Filippo Ubertini 2016 Iowa State University

Reconstruction Of In-Plane Strain Maps Using Hybrid Dense Sensor Network Composed Of Sensing Skin, Austin R.J. Downey, Simon Laflamme, Filippo Ubertini

Civil, Construction and Environmental Engineering Publications

The authors have recently developed a soft-elastomeric capacitive (SEC)-based thin film sensor for monitoring strain on mesosurfaces. Arranged in a network configuration, the sensing system is analogous to a biological skin, where local strain can be monitored over a global area. Under plane stress conditions, the sensor output contains the additive measurement of the two principal strain components over the monitored surface. In applications where the evaluation of strain maps is useful, in structural health monitoring for instance, such signal must be decomposed into linear strain components along orthogonal directions. Previous work has led to an algorithm that enabled ...


Robust Feedback Control Based On Low Order Models With Uncertainty Estimation For A Class Of Biomedical Problems, Hector Puebla, Miguel A. Gutierrez-Limon, Eliseo Hernandez-Martinez, Alejandra Velasco-Perez 2016 Universidad Autonoma Metropolitana

Robust Feedback Control Based On Low Order Models With Uncertainty Estimation For A Class Of Biomedical Problems, Hector Puebla, Miguel A. Gutierrez-Limon, Eliseo Hernandez-Martinez, Alejandra Velasco-Perez

Annual Symposium on Biomathematics and Ecology: Education and Research

No abstract provided.


Synchronization Of Coupled Neurons Via Robust Feedback, Hector Puebla, Ricardo Aguilar-Lopez, Priti Kumar Roy 2016 Universidad Autonoma Metropolitana

Synchronization Of Coupled Neurons Via Robust Feedback, Hector Puebla, Ricardo Aguilar-Lopez, Priti Kumar Roy

Annual Symposium on Biomathematics and Ecology: Education and Research

No abstract provided.


On The Characterization And Parametrization Of Strong Linearizations Of Polynomial Matrices, Efstathios Antoniou, Stavros Vologiannidis 2016 Alexander Technological Education Institute of Thessaloniki

On The Characterization And Parametrization Of Strong Linearizations Of Polynomial Matrices, Efstathios Antoniou, Stavros Vologiannidis

Electronic Journal of Linear Algebra

In the present note, a new characterization of strong linearizations, corresponding to a given regular polynomial matrix, is presented. A linearization of a regular polynomial matrix is a matrix pencil which captures the finite spectral structure of the original matrix, while a strong linearization is one incorporating its structure at infinity along with the finite one. In this respect, linearizations serve as a tool for the study of spectral problems where polynomial matrices are involved. In view of their applications, many linearization techniques have been developed by several authors in the recent years. In this note, a unifying approach is ...


Performance-Robust Dynamic Feedback Control Of Lipschitz Nonlinear Systems, Winston Baker 2016 Marquette University

Performance-Robust Dynamic Feedback Control Of Lipschitz Nonlinear Systems, Winston Baker

Dissertations (2009 -)

This dissertation addresses the dynamic control of nonlinear systems with finite energy noise in the state and measurement equations. Regional eigenvalue assignment (REA) is used to ensure that the state estimate error is driven to zero significantly faster than the state itself. Moreover, the controller is designed for the resulting closed loop system to achieve any one of a set of general performance criteria (GPC). The nonlinear model is assumed to have a Lipschitz nonlinearity both in the state and measurement equations. By using the norm bound of the nonlinearity, the controller is designed to be robust against all nonlinearities ...


Control System Research And Development To Support Virtual Prototyping Of Pump And Motors, Rajith Weerasinghe, Monika Ivantysynova, Paul Kalbfleisch 2016 Purdue University

Control System Research And Development To Support Virtual Prototyping Of Pump And Motors, Rajith Weerasinghe, Monika Ivantysynova, Paul Kalbfleisch

The Summer Undergraduate Research Fellowship (SURF) Symposium

Virtual prototyping of positive pumps and motors is incredibly useful, increasing speed of development and lowering cost. The calculations of fluids discharge pressure, displaced by a swashplate-type-axial piston pump/motor is dependent on the load impedance driven by the unit. The load impedance is estimated by a variable orifice found downstream of the unit. Similarly, the suction line impedance is also estimated with an orifice. The current project aims to evaluate the various loading architectures in their ability to quickly and accurately create the desired impedance. The robustness of the loading architectures was tested on a wide range of pump ...


Optimization-Free Optical Focal Field Engineering Through Reversing The Radiation Pattern From A Uniform Line Source, Yanzhong Yu, Qiwen Zhan 2016 University of Dayton

Optimization-Free Optical Focal Field Engineering Through Reversing The Radiation Pattern From A Uniform Line Source, Yanzhong Yu, Qiwen Zhan

Qiwen Zhan

A simple and flexible method is presented for the generation of optical focal field with prescribed characteristics. By reversing the field pattern radiated from a uniform line source, for which the electric current is constant along its extent, situated at the focus of a 4Pi focusing system formed by two confocal high-NA objective lenses, the required illumination distribution at the pupil plane for creating optical focal field with desired properties can be obtained. Numerical example shows that an arbitrary length optical needle with extremely high longitudinal polarization purity and consistent transverse size of ~0.36λ over the entire depth of ...


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