This thesis aims at providing a new approach for detecting R-waves in the ECG signal and generating the corresponding R-wave impulses with the delay between the original R-waves and the R-wave impulses being lesser than 100 ms. The algorithm was implemented in Matlab and tested with good results against 90 different ECG recordings from the MIT-BIH database. The Discrete Wavelet Transform (DWT) forms the heart of the algorithm providing a multi-resolution analysis of the ECG signal. The wavelet transform decomposes the ECG signal into frequency scales where the ECG characteristic waveforms are indicated by zero crossings. The adaptive threshold algorithms discussed in this thesis search for valid zero crossings which characterize the R-waves and also remove the Preventricular Contractions (PVC's). The adaptive threshold algorithms allow the decision thresholds to adjust for signal quality changes and eliminate the need for manual adjustments when changing from patient to patient. The delay between the R-waves in the original ECG signal and the R-wave impulses obtained from the algorithm was found to be less than 100 ms.

Progress in advanced microlithography and deposition techniques have made feasible high- k dielectric materials for MOS transistors. The continued scaling of CMOS devices is pushing the Si-SiO2 to its limit to consider high-k gate dielectrics. The demand for faster, low power, smaller, less expensive devices with good functionality and higher performance increases the demand for high-k dielectric based MOS devices. This thesis gives an in-depth study of threshold voltages of PMOS and NMOS transistors using various high-k dielectric materials like Tantalum pent oxide (Ta2O5), Hafnium oxide (HfO2), Zirconium oxide (ZrO2) and Aluminum oxide (Al2O3) gate oxides. Higher dielectric constant may lead to high oxide capacitance (Cox), which affects the threshold voltage (VT) of the device. The working potential of MOS devices can be increased by high dielectric gate oxide and work function of gate metal which may also influence the threshold voltage (VT). High dielectric materials have low gate leakage current, high breakdown voltage and are thermally stable on Silicon Substrate (Si). Different kinds of deposition techniques for different gate oxides, gate metals and stability over silicon substrates are analyzed theoretically. The impact of the properties of gate oxides such as oxide thickness, interface trap charges, doping concentration on threshold voltage were simulated, plotted and studied. This study involved comparisons of oxides-oxides, metals-metals, and metals-oxides. Gate metals and alloys with work function of less than 5eV would be suitable candidates for aluminum oxide, hafnium oxide etc. based MOSFETs.

The first part of the study deals with the preparation of carbon nanotube/polymer nanocomposite materials. The dispersion of multi-walled carbon nanotubes (MWNTs) using trifluoroacetic acid (TFA) as a co-solvent and its subsequent use in polymer nanocomposite fabrication is reported. The use of carbon nanotube/ polymer nanocomposite system for the fabrication of organic solar cells is also studied. TFA is a strong but volatile acid which is miscible with many commonly used organic solvents. Our study demonstrates that MWNTs can be effectively purified and readily dispersed in a range of organic solvents including dimethyl formamide (DMF), tetrahydrofuran (THF), and dichloromethane when mixed with 10 vol% trifluoroacetic acid (TFA). X-ray photoelectron spectroscopic analysis revealed that the chemical structure of the TFA-treated MWNTs remained intact without oxidation. The dispersed carbon nanotubes in TFA/THF solution were mixed with poly(methyl methacrylate) (PMMA) to fabricate polymer nanocomposites. A good dispersion of nanotubes in solution and in polymer matrices was observed and confirmed by SEM and optical microscopy study. Low percolation thresholds of electrical conductivity were observed from the fabricated MWNT/PMMA composite films. A carbon nanotube/ polymer nanocomposites system was also used for the fabrication of organic solar cells. A blend of single-wall carbon nanotubes (SWNTs) and poly3-hexylthiophene (P3HT) was used as the active layer in the device. The device characteristics showed that the fabrication of the solar cells was successful without any shorts in the circuit. The second part of the study deals with the preparation and characterization of electrode and electrolyte materials for lithium ion batteries. A system of lithium trifluoroacetate/ PMMA was used for its study as the electrolyte in lithium battery. A variety of different processing conditions were used to prepare the polymer electrolyte system. The conductivity of the electrolyte plays a critical role in the high power output of a battery. A high power output requires fast transport of lithium ions for which the conductivity of the electrolyte must be at least 3 x 10^-4 S/cm. Electrochemical Impedance Spectroscopy (EIS) was used to determine the conductivity of the polymer electrolyte films. Among the different processing conditions used to prepare the polymer electrolyte material, wet films of PMMA/salt system prepared by using 10vol% of TFA in THF showed the best results. At about 70wt% loading of the salt in the polymer, the conductivity obtained was about 1.1 x 10^-2 S/cm. Recently, the use of vanadium oxide material as intercalation host for lithium has gained widespread attention. Sol-gel derived vanadium oxide films were prepared and its use as a cathode material for lithium ion battery was studied. The application of carbon nanotubes in lithium ion battery was explored. A carbon nanotube /block copolymer (P3HT-b-PS) composite was prepared and its potential as an anode material was evaluated.

Confused Spaces has come to the conclusion that theatricality can be a device for defining different types of public space. This book aims to define theatricality in architectural terms by taking principles from the disciplines of theater and urban design. It limits the scope of the definition to a specific set of elements of theatricality that include spectacle, transition, flexibility, and compactability. After attempting to define why these elements of theatricality are valid architectural concepts, the text then pushes to understand the experience that these elements can create. Through the use of historical and contemporary references, an argument for theatricality can already be found to exist but simply has not been clearly defined. The best methods of studying the design concepts are initially discussed. It is believed that in addition to a thorough case study of an existing structure which practices theatricality, the best way to explain the concepts of the idea as well as analyze them would be through several design attempts. Architectural competitions become the venue for experimentation. Three competition entries are submitted that attempt to implement theatricality. One more competition is created and results in an exhibition of the entries as well as an installation which can be studied and analyzed in a physical space. By using principles distilled from all the preceding research and design analysis, a theoretical large-scale design is explored. The design combines significant site data with all the design principles defended in the text up to this point. The design becomes the most complete visual representation of the core concept for theatricality. In conclusion, it is determined that the principles of theatricality clearly have a significant impact on the public and the pedestrian experience. It is encouraged for the concept to be used as a design device for creating pedestrian-friendly spaces in the future.

The purpose of this study was to identify potential threshold concepts in the music industry as perceived by expert music industry professionals; the data collected may possibly inform postsecondary music industry degree program curriculum design. Threshold concept theory emerged in the early 2000s largely due to the research of Meyer & Land (2003, 2005) as a means to illuminate discipline-specific criteria that irreversibly transform a learner’s positionality within a professional discipline. Through the mastery of a threshold concept, a learner becomes aware of discipline specific norms, and may experience a reconstitution of their own identity as a professional. This is the first study to explore threshold concepts within the music industry. This study is also aimed to contribute to a growing body of research at the intersection of threshold concepts and business education. Utilizing qualitative research informed by phenomenology, semi-structured interviews based on the primary tenets of the threshold concept theory framework were conducted. “Expert” music industry professionals were asked to reflect upon their lived experiences regarding their assimilation into the music industry and maintenance of a sustainable career in the discipline. The data collected were aligned with the threshold concept theory framework in order to illuminate potential threshold concepts specific to the music industry. Results indicate that there exist possible dispositional and disciplinary threshold concepts relative to becoming a music industry professional. The identification, prioritization, and utilization of threshold concepts are applicable to curriculum planning at both the macro- (program creation, execution, and evaluation) and micro- (course creation, planning, instruction, and evaluation) levels for post-secondary music industry education.

Owing to its excellent scaling potential, low power consumption, high switching speed, and good retention, and endurance properties, Resistive Random Access Memory (RRAM) is one of the prime candidates to supplant current Nonvolatile Memory (NVM) based on the floating gate (FG) MOSFET transistor, which is at the end of its scaling capability. The RRAM technology comprises two subcategories: 1) the resistive phase change memory (PCM), which has been very recently deployed commercially, and 2) the filamentary conductive bridge RAM (CBRAM) which holds the promise of even better scaling potential, less power consumption, and faster access times. This thesis focuses on several aspects of the CBRAM technology. CBRAM devices are based on nanoionics transport and chemo-physical reactions to create filamentary conductive paths across a dielectric sandwiched between two metal electrodes. These nano-size filaments can be formed and ruptured reliably and repeatedly by application of appropriate voltages. Although, there exists a large body of literature on this topic, many aspects of the CBRAM mechanisms and are still poorly understood. In the next paragraph, the aspects of CBRAM studied in this thesis are spelled out in more detail. CBRAM cell is not only an attractive candidate for a memory cell but is also a good implementation of a new circuit element, called memristor, as postulated by Leon Chua. Basically, a memristor, is a resistor with a memory. Such an element holds the promise to mimic neurological switching of neuron and synapses in human brain that are much more efficient than the Neuman computer architecture with its current CMOS logic technology. A memristive circuitry can possibly lead to much more powerful neural computers in the future. In the course of the research undertaken in this thesis, many memristive properties of the resistive cells have been found and used in models to describe the behavior of the resistive switching devices. The research performed in this study has also an immediate commercial application. Currently, the semiconductor industry is faced with so-called latency scaling dilemma. In the past, the bottleneck for the signal propagation was the time delay of the transistor. Today, the transistors became so fast that the bottleneck for the signal propagation is now the RC time delay of the interconnecting metal lines. Scaling drives both, resistance and parasitic capacitance of the metal lines to very high values. In this context, one observes that resistive switching memory does not require a Si substrate. It is therefore an excellent candidate for its implementation as an o n-chip memory above the logic circuits in the CMOS back-end, thus making the signal paths between logic and memory extremely short. In the framework of a Semiconductor Research Corporation (SRC) project with Intel Corporation, this thesis investigated the breakdown and resistive switching properties of currently deployed low k interlayer dielectrics to understand the mechanisms and potential of different material choices for a realization of an RRAM memory to be implemented in the back-end of a CMOS process flow. / Master of Science

This dissertation has its focus on two different topics: 1. non-asymptotic analysis of polar codes as a new paradigm in error correcting codes with very promising features, and 2. network properties for wireless networks of practical size. In its first part, we investigate properties of polar codes that can be potentially useful in real-world applications. We start with analyzing the performance of finite-length polar codes over the binary erasure channel (BEC), while assuming belief propagation (BP) as the decoding method. We provide a stopping set analysis for the factor graph of polar codes, where we find the size of the minimum stopping set. Our analysis along with bit error rate (BER) simulations demonstrates that finite-length polar codes show superior error floor performance compared to the conventional capacity-approaching coding techniques. Motivated by good error floor performance, we introduce a modified version of BP decoding while employing a guessing algorithm to improve the BER performance. Each application may impose its own requirements on the code design. To be able to take full advantage of polar codes in practice, a fundamental question is which practical requirements are best served by polar codes. For example, we will see that polar codes are inherently well-suited for rate-compatible applications and they can provably achieve the capacity of time-varying channels with a simple rate-compatible design. This is in contrast to LDPC codes for which no provably universally capacity-achieving design is known except for the case of the erasure channel. This dissertation investigates different approaches to applications such as UEP, rate-compatible coding, and code design over parallel sub-channels (non-uniform error correction). Furthermore, we consider the idea of combining polar codes with other coding schemes, in order to take advantage of polar codes' best properties while avoiding their shortcomings. Particularly, we propose, and then analyze, a polar code-based concatenated scheme to be used in Optical Transport Networks (OTNs) as a potential real-world application The second part of the dissertation is devoted to the analysis of finite wireless networks as a fundamental problem in the area of wireless networking. We refer to networks as being finite when the number of nodes is less than a few hundred. Today, due to the vast amount of literature on large-scale wireless networks, we have a fair understanding of the asymptotic behavior of such networks. However, in real world we have to face finite networks for which the asymptotic results cease to be valid. Here we study a model of wireless networks, represented by random geometric graphs. In order to address a wide class of the network's properties, we study the threshold phenomena. Being extensively studied in the asymptotic case, the threshold phenomena occurs when a graph theoretic property (such as connectivity) of the network experiences rapid changes over a specific interval of the underlying parameter. Here, we find an upper bound for the threshold width of finite line networks represented by random geometric graphs. These bounds hold for all monotone properties of such networks. We then turn our attention to an important non-monotone characteristic of line networks which is the Medium Access (MAC) layer capacity, defined as the maximum number of possible concurrent transmissions. Towards this goal, we provide a linear time algorithm which finds a maximal set of concurrent non-interfering transmissions and further derive lower and upper bounds for the cardinality of the set. Using simulations, we show that these bounds serve as reasonable estimates for the actual value of the MAC-layer capacity.

Radicalization is as a formidable challenge for several nations. While radicalization continues to flare across the world, empirical evidence and consensus regarding its determinants remain scarce. This cumulative dissertation aims to contribute to understanding the determinants of radicalization based on three research papers. The first paper undertakes a systematic review of the existing scientific literature on radicalization. The second paper empirically tests the predictive power of the most plausible factors identified in the systematic review. The third paper empirically investigates the existence of non-linearities in the relationship between radicalization and socioeconomic factors.:1. Introduction 2. Understanding the Determinants of Radicalization: A Systematic Review 3. An Empirical Assessment of the Determinants of Radicalization: Evidence from North-Western Pakistan 4. Socioeconomic Factors and Radicalization in Pakistan: A Non-Linear Exploration 5. References

An excised animal larynx model has been used in many studies to better understand the physiological and anatomical properties of the human larynx. One difference between an ex vivo model and an in vivo model is that ion loss occurs postmortem. To compensate for this in the excised model, researchers most commonly use a preservation method that includes completely submerging the specimen in isotonic saline (0.9% Na+Cl-) and then flash freezing it in liquid nitrogen. The flash freezing method allows researchers to maintain the integrity of the structures while also being able to gather specimens as they become available. Not enough research has been done to understand the effects of a preservation method on the outcomes of the study. Additionally, no common method has been established for preservation across studies to ensure that results are not being influenced by this variable. This prospective, mixed experimental design study includes three groups, a control group and two experimental groups. The control group consisted of 10 bench-mounted porcine larynges that were soaked in isotonic saline and flash frozen with liquid nitrogen. Prior to the experiment, the frozen larynges were thawed overnight before trials. The other two groups consisted of 10 bench-mounted porcine larynges each; these larynges were soaked in either isotonic saline or Ringers solution, a balanced fluid used in vivo to counteract dehydration. Larynges from these two groups were kept fresh and stored in a refrigerator overnight before trials. On the day of experimentation, each larynx was mounted on a bench top setup including three micropositioners to stabilize, adduct, and elongate the vocal folds. All the larynges were connected to a pseudolung via the trachea and humidified air was passed through to the vocal folds until phonation was achieved. Phonatory trials consisted of brief phonation followed by 5-minute desiccation intervals until phonation was no longer achieved. Phonation threshold flow (PTF), defined as the flow observed at the onset of phonation, was observed during each phonation trial; and flow values were compared within and between groups. Statistically significant differences were found between the Ringers group and the fresh saline group as well as between the Ringers group and the frozen saline group, indicating that PTF is influenced by the larynx preservation method.

Blockchain is a decentralized and immutable append-only ledger. Smart contracts, the self-executing programs on blockchain, help build the Decentralized Finance (DeFi) markets. Front-running is the practice of benefiting from advanced knowledge of pending transactions. It impairs the fairness of DeFi ecosystem, leading to huge losses of honest participants. In this thesis, We present Flash Freezing Flash Boys (F3B), a blockchain framework that mitigates front-running with threshold cryptography. In F3B, transactions are encrypted with symmetric keys, which are collaboratively kept by a decentralized secret-management committee (SMC). Once the transactions are committed and immutable, the keys are reconstructed to execute the transactions. F3B hides the content of pending transactions so that adversaries cannot acquire information about them, thus mitigating frontrunning. Previous work using threshold encryption mitigates front-running with per-block encryption, which would fail when a transaction is not included in the expected future block. F3B solves this issue by adopting per-transaction encryption, ensuring that any uncommitted transaction remains encrypted and private, even when a huge network delay occurs. F3B is an execution layer front-running solution, meaning that it is independent of the consensus algorithms and compatible with existing blockchain networks and smart contracts. F3B is evaluated on a simulated Ethereum network, and proved to be a practical low-latency solution. F3B presents a negligible (0.026%) latency overhead with 128 SMC members, compared with the unprotected blockchain. / Blockchain är en decentraliserad och oföränderlig bilaga-endast reskontra. Smarta kontrakt, de självutförande programmen på blockchain, hjälper till att bygga decentraliserade finansmarknader (DeFi). Front-running är praktiken att dra nytta av avancerad kunskap av pågående transaktioner. Det försämrar rättvisan hos DeFi-ekosystemet, leder till enorma förluster av ärliga deltagare. I denna avhandling presenterar vi Flash Freezing Flash Boys (F3B), ett blockchain-ramverk som dämpar frontkörning med tröskelkryptografi. I F3B krypteras transaktioner med symmetriska nycklar, som hålls i samarbete av en decentraliserad hemlig förvaltningskommitté (SMC). När transaktionerna väl är genomförda och oföränderliga, nycklarna rekonstrueras för att utföra transaktionerna. F3B döljer innehållet i pågående transaktioner så att motståndare inte kan få information om dem, vilket minskar frontrunning. Tidigare arbete med tröskelkryptering minskar körning i förväg med kryptering per block, vilket skulle misslyckas när en transaktion inte ingår i det förväntade framtida blocket. F3B löser det här problemet genom att använda kryptering per transaktion, vilket säkerställer att alla oengagerade transaktioner förblir krypterade och privata, även när en enorm nätverksfördröjning inträffar. F3B är en exekveringslagers frontrunning lösning, vilket innebär att den är oberoende av konsensusalgoritmerna och kompatibel med befintliga blockchain-nätverk och smarta kontrakt. F3B utvärderas på ett simulerat Ethereum-nätverk och visade sig vara en praktisk lösning med låg latens. F3B presenterar en försumbar (0,026%) latensoverhead med 128 SMC-medlemmar, jämfört med den oskyddade blockkedjan.