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Silicon Germanium Bicmos Comparator Designed For Use In An Extreme Environment Analog To Digital Converter, Benjamin Riley Sissons 2017 University of Arkansas, Fayetteville

Silicon Germanium Bicmos Comparator Designed For Use In An Extreme Environment Analog To Digital Converter, Benjamin Riley Sissons

Theses and Dissertations

This thesis demonstrates the process of creating a radiation hardened and extreme temperature operating comparator from start to finish in the 90 nm SiGe 9HP process node. This includes the entire design flow from examining comparator topologies, to designing the initial comparator circuits, to simulating the comparator over a temperature range of -196°C to 125°C, and finally the testing of the fabricated circuit. To verify the circuit would work at low temperatures, several new device models were created that could be used for simulations at -196°C. In addition to its properties as a standalone comparator, the circuit ...


Damage Location And Quantification Of A Pretensioned Concrete Beam Using Stochastic Subspace Identification, Alessandro Cancelli, Laura Micheli, Simon Laflamme, Alice Alipour, Sri Sritharan, Filippo Ubertini 2017 Iowa State University

Damage Location And Quantification Of A Pretensioned Concrete Beam Using Stochastic Subspace Identification, Alessandro Cancelli, Laura Micheli, Simon Laflamme, Alice Alipour, Sri Sritharan, Filippo Ubertini

Civil, Construction and Environmental Engineering Conference Presentations and Proceedings

Stochastic subspace identification (SSID) is a first-order linear system identification technique enabling modal analysis through the time domain. Research in the field of structural health monitoring has demonstrated that SSID can be used to successfully retrieve modal properties, including modal damping ratios, using output-only measurements. In this paper, the utilization of SSID for indirectly retrieving structures’ stiffness matrix was investigated, through the study of a simply supported reinforced concrete beam subjected to dynamic loads. Hence, by introducing a physical model of the structure, a second-order identification method is achieved. The reconstruction is based on system condensation methods, which enables calculation ...


Continuous And Embedded Solutions For Shm Of Concrete Structures Using Changing Electrical Potential In Self-Sensing Cement-Based Composites, Austin Downey, Enrique Garcia-Macias, Antonella D'Alessandro, Simon Laflamme, Rafael Castro-Triguero, Filippo Ubertini 2017 Iowa State University

Continuous And Embedded Solutions For Shm Of Concrete Structures Using Changing Electrical Potential In Self-Sensing Cement-Based Composites, Austin Downey, Enrique Garcia-Macias, Antonella D'Alessandro, Simon Laflamme, Rafael Castro-Triguero, Filippo Ubertini

Civil, Construction and Environmental Engineering Conference Presentations and Proceedings

Interest in the concept of self-sensing structural materials has grown in recent years due to its potential to enable continuous low-cost monitoring of next-generation smart-structures. The development of cement-based smart sensors appears particularly well suited for monitoring applications due to their numerous possible field applications, their ease of use and long-term stability. Additionally, cement-based sensors offer a unique opportunity for structural health monitoring of civil structures because of their compatibility with new or existing infrastructure. Particularly, the addition of conductive carbon nanofillers into a cementitious matrix provides a self-sensing structural material with piezoresistive characteristics sensitive to deformations. The strain-sensing ability ...


The Effect Of Power Supply Ramp Time On Sram Puf's, Abdelrahman T. Elshafiey Mr. 2017 University of New Mexico - Main Campus

The Effect Of Power Supply Ramp Time On Sram Puf's, Abdelrahman T. Elshafiey Mr.

Electrical and Computer Engineering ETDs

Physical unclonable functions (PUFs) are security primitives that exploit the device mismatches. PUFs are a promising solution for hardware cryptography and key storage. They are used in many security applications including identification, authentication and key generation. SRAM is one of the popular implementations of PUFs. SRAM PUFs offer the advantage, over other PUF constructions, of reusing resources (memories) that already exist in many designs.

In this thesis, for the first time, it is demonstrated that the start-up value of an SRAM PUF could be different depending on the SRAM power supply rising time. An analytical model has been developed to ...


A Robust Signal Processing Method For Quantitative High-Cycle Fatigue Crack Monitoring Using Soft Elastomeric Capacitor Sensors, Xiangxiong Kong, Jian Li, William Collins, Caroline Bennett, Simon Laflamme, Hongki Jo 2017 University of Kansas

A Robust Signal Processing Method For Quantitative High-Cycle Fatigue Crack Monitoring Using Soft Elastomeric Capacitor Sensors, Xiangxiong Kong, Jian Li, William Collins, Caroline Bennett, Simon Laflamme, Hongki Jo

Civil, Construction and Environmental Engineering Conference Presentations and Proceedings

A large-area electronics (LAE) strain sensor, termed soft elastomeric capacitor (SEC), has shown great promise in fatigue crack monitoring. The SEC is able to monitor strain changes over a mesoscale structural surface and endure large deformations without being damaged under cracking. Previous tests verified that the SEC is able to detect, localize, and monitor fatigue crack activities under low-cycle fatigue loading. In this paper, to examine the SEC’s capability of monitoring high-cycle fatigue cracks, a compact specimen is tested under cyclic tension, designed to ensure realistic crack opening sizes representative of those in real steel bridges. To overcome the ...


Variable Input Observer For State Estimation Of High-Rate Dynamics, Jonathan Hong, Liang Cao, Simon Laflamme, Jacob Dodson 2017 Iowa State University

Variable Input Observer For State Estimation Of High-Rate Dynamics, Jonathan Hong, Liang Cao, Simon Laflamme, Jacob Dodson

Civil, Construction and Environmental Engineering Conference Presentations and Proceedings

High-rate systems operating in the 10 μs to 10 ms timescale are likely to experience damaging effects due to rapid environmental changes (e.g., turbulence, ballistic impact). Some of these systems could benefit from real-time state estimation to enable their full potential. Examples of such systems include blast mitigation strategies, automotive airbag technologies, and hypersonic vehicles. Particular challenges in high-rate state estimation include: 1) complex time varying nonlinearities of system (e.g. noise, uncertainty, and disturbance); 2) rapid environmental changes; 3) requirement of high convergence rate. Here, we propose using a Variable Input Observer (VIO) concept to vary the ...


Experimental Damage Detection Of Wind Turbine Blade Using Thin Film Sensor Array, Austin Downey, Simon Laflamme, Filippo Ubertini, Partha Sarkar 2017 Iowa State University

Experimental Damage Detection Of Wind Turbine Blade Using Thin Film Sensor Array, Austin Downey, Simon Laflamme, Filippo Ubertini, Partha Sarkar

Civil, Construction and Environmental Engineering Conference Presentations and Proceedings

Damage detection of wind turbine blades is difficult due to their large sizes and complex geometries. Additionally, economic restraints limit the viability of high-cost monitoring methods. While it is possible to monitor certain global signatures through modal analysis, obtaining useful measurements over a blade's surface using off-the-shelf sensing technologies is difficult and typically not economical. A solution is to deploy dedicated sensor networks fabricated from inexpensive materials and electronics. The authors have recently developed a novel large-area electronic sensor measuring strain over very large surfaces. The sensing system is analogous to a biological skin, where local strain can be ...


Damage Detection And Localization Algorithm Using A Dense Sensor Network Of Thin Film Sensors, Austin Downey, Filippo Ubertini, Simon Laflamme 2017 Iowa State University

Damage Detection And Localization Algorithm Using A Dense Sensor Network Of Thin Film Sensors, Austin Downey, Filippo Ubertini, Simon Laflamme

Civil, Construction and Environmental Engineering Conference Presentations and Proceedings

The authors have recently proposed a hybrid dense sensor network consisting of a novel, capacitive-based thin-film electronic sensor for monitoring strain on mesosurfaces and fiber Bragg grating sensors for enforcing boundary conditions on the perimeter of the monitored area. The thin-film sensor monitors local strain over a global area through transducing a change in strain into a change in capacitance. In the case of bidirectional in-plane strain, the sensor output contains the additive measurement of both principal strain components. When combined with the mature technology of fiber Bragg grating sensors, the hybrid dense sensor network shows potential for the monitoring ...


Probabilistic Performance-Based Design For High Performance Control Systems, Laura Micheli, Liang Cao, Yongqiang Gong, Alessandro Cancelli, Simon Laflamme, Alice Alipour 2017 Iowa State University

Probabilistic Performance-Based Design For High Performance Control Systems, Laura Micheli, Liang Cao, Yongqiang Gong, Alessandro Cancelli, Simon Laflamme, Alice Alipour

Civil, Construction and Environmental Engineering Conference Presentations and Proceedings

High performance control systems (HPCS) are advanced damping systems capable of high damping performance over a wide frequency bandwidth, ideal for mitigation of multi-hazards. They include active, semi-active, and hybrid damping systems. However, HPCS are more expensive than typical passive mitigation systems, rely on power and hardware (e.g., sensors, actuators) to operate, and require maintenance. In this paper, a life cycle cost analysis (LCA) approach is proposed to estimate the economic benefit these systems over the entire life of the structure. The novelty resides in the life cycle cost analysis in the performance based design (PBD) tailored to multi-level ...


A Novel Tuned Liquid Wall Damper For Multi-Hazard Mitigation, Hao Wu, Liang Cao, An Chen, Simon Laflamme 2017 Iowa State University

A Novel Tuned Liquid Wall Damper For Multi-Hazard Mitigation, Hao Wu, Liang Cao, An Chen, Simon Laflamme

Civil, Construction and Environmental Engineering Conference Presentations and Proceedings

A structural system consists of gravity and lateral load resisting components. Structural walls in the gravity system are typically designed to resist vertical loads only, and are assumed to be inactive to mitigate lateral loads. In this paper, we propose a novel multifunctional wall system, which is embedded with multiple-capillaries containing free-flowing fluids and can act as both a load carrying member and a Tuned Liquid Wall Damper (TLWD). Functioning similarly to a Tuned Liquid Column Damper (TLCD), the damping force of the proposed wall system is provided by the head loss of the fluid between each capillary. An analytical ...


Securing Database Users From The Threat Of Sql Injection Attacks, Nisharg Shah 2017 Southern Methodist University

Securing Database Users From The Threat Of Sql Injection Attacks, Nisharg Shah

Electrical Engineering Theses and Dissertations

In the 21st century, there has been a significant rise in dependency on the Internet for daily activities. Web applications such as online banking, web-based emails, social networking, and many more services have become an instant means of communication. These web applications and the data to which they have access are often targeted using malicious attacks, including SQL (Structured Query Language) Injection Attacks (from now on referenced as SQLIAs), which may cause serious damage. In particular, attackers use SQLIAs to target interactive web applications that incorporate database services. In a SQLIA, an attacker can insert malicious SQL code as ...


Quadded Gasp: A Fault Tolerant Asynchronous Design, Kristopher S. Scheiblauer 2017 Portland State University

Quadded Gasp: A Fault Tolerant Asynchronous Design, Kristopher S. Scheiblauer

Dissertations and Theses

As device scaling continues, process variability and defect densities are becoming increasingly challenging for circuit designers to contend with. Variability reduces timing margins, making it difficult and time consuming to meet design specifications. Defects can cause degraded performance or incorrect operation resulting in circuit failure. Consequently test times are lengthened and production yields are reduced.

This work assess the combination of two concepts, self-timed asynchronous design and fault tolerance, as a possible solution to both variability and defects. Asynchronous design is not as sensitive to variability as synchronous, while fault tolerance allows continued functional operation in the presence of defects ...


A Hierarchical Architectural Framework For Securing Unmanned Aerial Systems, Matthew Leccadito 2017 Virginia Commonwealth University

A Hierarchical Architectural Framework For Securing Unmanned Aerial Systems, Matthew Leccadito

Theses and Dissertations

Unmanned Aerial Systems (UAS) are becoming more widely used in the new era of evolving technology; increasing performance while decreasing size, weight, and cost. A UAS equipped with a Flight Control System (FCS) that can be used to fly semi- or fully-autonomous is a prime example of a Cyber Physical and Safety Critical system. Current Cyber-Physical defenses against malicious attacks are structured around security standards for best practices involving the development of protocols and the digital software implementation. Thus far, few attempts have been made to embed security into the architecture of the system considering security as a holistic problem ...


Oracle Guided Incremental Sat Solving To Reverse Engineer Camouflaged Circuits, xiangyu zhang 2017 University of Massachusetts Amherst

Oracle Guided Incremental Sat Solving To Reverse Engineer Camouflaged Circuits, Xiangyu Zhang

Masters Theses

This study comprises two tasks. The first is to implement gate-level circuit camouflage techniques. The second is to implement the Oracle-guided incremental de-camouflage algorithm and apply it to the camouflaged designs.

The circuit camouflage algorithms are implemented in Python, and the Oracle- guided incremental de-camouflage algorithm is implemented in C++. During this study, I evaluate the Oracle-guided de-camouflage tool (Solver, in short) performance by de-obfuscating the ISCAS-85 combinational benchmarks, which are camouflaged by the camouflage algorithms. The results show that Solver is able to efficiently de-obfuscate the ISCAS-85 benchmarks regardless of camouflaging style, and is able to do so 10 ...


Skynet: Memristor-Based 3d Ic For Artificial Neural Networks, Sachin Bhat 2017 University of Massachusetts Amherst

Skynet: Memristor-Based 3d Ic For Artificial Neural Networks, Sachin Bhat

Masters Theses

Hardware implementations of artificial neural networks (ANNs) have become feasible due to the advent of persistent 2-terminal devices such as memristor, phase change memory, MTJs, etc. Hybrid memristor crossbar/CMOS systems have been studied extensively and demonstrated experimentally. In these circuits, memristors located at each cross point in a crossbar are, however, stacked on top of CMOS circuits using back end of line processing (BOEL), limiting scaling. Each neuron’s functionality is spread across layers of CMOS and memristor crossbar and thus cannot support the required connectivity to implement large-scale multi-layered ANNs.

This work proposes a new fine-grained 3D integrated ...


Energy Efficient Loop Unrolling For Low-Cost Fpgas, Naveen Kumar Dumpala 2017 University of Massachusetts Amherst

Energy Efficient Loop Unrolling For Low-Cost Fpgas, Naveen Kumar Dumpala

Masters Theses

Many embedded applications implement block ciphers and sorting and searching algorithms which use multiple loop iterations for computation. These applications often demand low power operation. The power consumption of designs varies with the implementation choices made by designers. The sequential implementation of loop operations consumes minimal area, but latency and clock power are high. Alternatively, loop unrolling causes high glitch power. In this work, we propose a low area overhead approach for unrolling loop iterations that exhibits reduced glitch power. A latch based glitch filter is introduced that reduces the propagation of glitches from one iteration to next. We explore ...


Robust Variable Input Observer For Structural Health Monitoring Of Systems Experiencing Harsh Extreme Environments, Jonathan Hong, Liang Cao, Simon Laflamme, Jacob Dodson 2017 Iowa State University

Robust Variable Input Observer For Structural Health Monitoring Of Systems Experiencing Harsh Extreme Environments, Jonathan Hong, Liang Cao, Simon Laflamme, Jacob Dodson

Civil, Construction and Environmental Engineering Conference Presentations and Proceedings

Systems experiencing events in the order of 10μs-10ms timescales, for instance highrate dynamics or harsh extreme environments, may encounter rapid damaging effects. If the structural health of such systems could be accurately estimated in a timely manner, preventative measures could be employed to minimize adverse effects. Previously, a Variable Input Observer (VIO) coupled with a neuro-observer was proposed by the authors as a potential solution in monitoring their structural health. The objective of the VIO is to provide state estimation based on an optimal input space allowed to vary as a function of time. The VIO incorporates the use of ...


Stringless Guitar, Kue Z. Yang, Anthony Batey, Dominic Mercorelli, Nathaniel Hawk 2017 University of Akron

Stringless Guitar, Kue Z. Yang, Anthony Batey, Dominic Mercorelli, Nathaniel Hawk

Williams Honors College, Honors Research Projects

The aim of this project is to improve the design of a typical guitar by designing a digital stringless guitar. Due to the nonlinearities inherent in a guitar, it would be difficult to reproduce guitar tones by summing harmonic components; therefore, digital samples of guitar tones were taken in order to preserve these unique and wonderfully sounding tones. These digital samples were stored in the guitar and used to produce its tones when played. The digital guitar includes fingerboard position sensors as well as strum sensors for each string. The fingerboard position sensors detect the player’s fingers at discrete ...


Microsecond State Monitoring Of Nonlinear Time-Varying Dynamic Systems, Jacob Dodson, Bryan Joyce, Applied Research Associates Inc., Simon Laflamme, Janet Wolfson 2017 Air Force Research Laboratory

Microsecond State Monitoring Of Nonlinear Time-Varying Dynamic Systems, Jacob Dodson, Bryan Joyce, Applied Research Associates Inc., Simon Laflamme, Janet Wolfson

Civil, Construction and Environmental Engineering Conference Presentations and Proceedings

Reliable operation of next generation high-speed complex structures (e.g. hypersonic air vehicles, space structures, and weapons) relies on the development of microsecond structural health monitoring (μSHM) systems. High amplitude impacts may damage or alter the structure, and therefore change the underlying system configuration and the dynamic response of these systems. While state-of-the-art structural health monitoring (SHM) systems can measure structures which change on the order of seconds to minutes, there are no real-time methods for detection and characterization of damage in the microsecond timescales.

This paper presents preliminary analysis addressing the need for microsecond detection of state and parameter ...


Automated Crack Detection In Conductive Smart-Concrete Structures Using A Resistor Mesh Model, Austin Downey, Antonella D'Alessandro, Filippo Ubertini, Simon Laflamme 2017 Iowa State University

Automated Crack Detection In Conductive Smart-Concrete Structures Using A Resistor Mesh Model, Austin Downey, Antonella D'Alessandro, Filippo Ubertini, Simon Laflamme

Civil, Construction and Environmental Engineering Publications

Various nondestructive evaluation techniques are currently used to automatically detect and monitor cracks in concrete infrastructure. However, these methods often lack the scalability and cost-effectiveness over large geometries. A solution is the use of self-sensing carbon-doped cementitious materials. These self-sensing materials are capable of providing a measurable change in electrical output that can be related to their damage state. Previous work by the authors showed that a resistor mesh model could be used to track damage in structural components fabricated from electrically conductive concrete, where damage was located through the identification of high resistance value resistors in a resistor mesh ...


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