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2006

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A State-Space Approach To Blind Estimation Of Mimo Wireless Channels, Hesham Mahmoud Zarif Amin Badr Jan 2006

A State-Space Approach To Blind Estimation Of Mimo Wireless Channels, Hesham Mahmoud Zarif Amin Badr

LSU Doctoral Dissertations

This dissertation focuses on blind channel estimation in wireless communications such that the estimated channel admits the minimum phase property. It assumes only the second order statistics of the transmitted signal at the receive side. Our proposed approach is based on the generalized spectral factorization because of the deficient normal rank for the power spectral density (PSD) function of the received signal. We will show the relationship between the generalized spectral factorization and inner-outer factorizations where the inner is square with smaller size. The inner-outer factorization is in turn related to the generalized Kalman filtering in which the dimension of …

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Tribological Aspects Of Journal Bearings Focusing On The Stribeck Curve, Xiaobin Lu Jan 2006

Tribological Aspects Of Journal Bearings Focusing On The Stribeck Curve, Xiaobin Lu

LSU Doctoral Dissertations

The dissertation focuses on the frictional characteristics of journal bearings as represented by the Stribeck curve. The behavior of lift-off speed and the factors that affect it are explored. An equation is proposed for predicting the lift-off speed. The comparison between the experimental results of oil- and grease-lubricated journal bearings with a mixed elastohydrodynamic lubrication model for line contacts is indicative of good agreement in the mixed lubrication regime. Efforts are made to modify the surface profile of bushing by putting dimples on its surface. Experimental results show that with proper dimensions of dimples, the friction performance of journal bearings …

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Mimo-Ofdm Communication Systems: Channel Estimation And Wireless Location, Zhongshan Wu Jan 2006

Mimo-Ofdm Communication Systems: Channel Estimation And Wireless Location, Zhongshan Wu

LSU Doctoral Dissertations

In this new information age, high data rate and strong reliability features our wireless communication systems and is becoming the dominant factor for a successful deployment of commercial networks. MIMO-OFDM (multiple input multiple output-orthogonal frequency division multiplexing), a new wireless broadband technology, has gained great popularity for its capability of high rate transmission and its robustness against multi-path fading and other channel impairments. A major challenge to MIMO-OFDM systems is how to obtain the channel state information accurately and promptly for coherent detection of information symbols and channel synchronization. In the first part, this dissertation formulates the channel estimation problem …

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Influence Of Surface Chemistry On The Aggregation Of Beta Amyloid Peptide, Mariah Joan Wooldridge Mcmasters Jan 2006

Influence Of Surface Chemistry On The Aggregation Of Beta Amyloid Peptide, Mariah Joan Wooldridge Mcmasters

LSU Doctoral Dissertations

Alzheimer's disease is a progressive neurological ailment affecting 4.5 million aging Americans. The disease is characterized by the presence in the brain of self-assembled fibrils consisting of beta amyloid protein (Aβ). Soluble Aβ protein is present in normal human cerebrospinal fluid, but it is unclear what makes the protein aggregate into insoluble plaques. There is evidence that the Aβ fibril assembly is affected by interactions with biological surfaces, such as neuronal membranes. Here, surfaces consisting of self-assembled alkanethiol monolayers with different end groups were used to test the effect of surface chemistry on the structure and morphology of aggregates formed …

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A Distribution Kinetics Approach For Polymer Crystallization And Phase Separation, Jiao Yang Jan 2006

A Distribution Kinetics Approach For Polymer Crystallization And Phase Separation, Jiao Yang

LSU Doctoral Dissertations

The mechanism of polymer crystallization is extensively studied and still far away from consensus. This research adopted cluster size distribution kinetics approach to explore the kinetics of polymer crystallization and phase separation within spinodal region. The kinetics of polymer crystallization is studied by integrating nucleation, crystal growth and ripening. Population balance equations based on crystal size distribution and concentration of amorphous polymer segments are solved numerically and the related differential moment equations are also solved. The model accounts for nucleation and crystal growth. Different mass dependences of growth and dissociation rate coefficients are proposed to investigate the fundamental features of …

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Cardio-Respiratory Interaction And Its Contribution In Syncope, Xue Wang Jan 2006

Cardio-Respiratory Interaction And Its Contribution In Syncope, Xue Wang

University of Kentucky Doctoral Dissertations

A hypothetical causal link between ventilatory regulation of carbon dioxide anddevelopment of syncope during orthostatic challenges is reduction in arterial partialpressure of carbon dioxide and resultant reduction in cerebral blood flow. We performedtwo experiments to investigate the ventilatory sensitivity to carbon dioxide and factorsaffecting cerebral autoregulation (CA). We also studied the nonlinear phase couplingbetween cardio-respiratory parameters before syncope.For experiment one, in 30 healthy adults, we stimulated chemo and baro reflexesby breathing either room-air or room-air with 5 percent carbon dioxide in a pseudorandom binary sequence during supine and 70 degree head up tilt (HUT). Six subjectsdeveloped presyncope during tilt.To determine …

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Investigations Into The Cognitive Abilities Of Alternate Learning Classifier System Architectures, David Alexander Gaines Jan 2006

Investigations Into The Cognitive Abilities Of Alternate Learning Classifier System Architectures, David Alexander Gaines

University of Kentucky Doctoral Dissertations

The Learning Classifier System (LCS) and its descendant, XCS, are promising paradigms for machine learning design and implementation. Whereas LCS allows classifier payoff predictions to guide system performance, XCS focuses on payoff-prediction accuracy instead, allowing it to evolve "optimal" classifier sets in particular applications requiring rational thought. This research examines LCS and XCS performance in artificial situations with broad social/commercial parallels, created using the non-Markov Iterated Prisoner's Dilemma (IPD) game-playing scenario, where the setting is sometimes asymmetric and where irrationality sometimes pays. This research systematically perturbs a "conventional" IPD-playing LCS-based agent until it results in a full-fledged XCS-based agent, contrasting …

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Dynamics Of Action Potential Duration: Effects On Restitution And Repolarization Alternans, Runze Wu Jan 2006

Dynamics Of Action Potential Duration: Effects On Restitution And Repolarization Alternans, Runze Wu

University of Kentucky Doctoral Dissertations

The presented studies investigate dynamics of action potential duration (APD) tobetter understand the underlying mechanism for repolarization alternans.We recorded trans-membrane potentials (TMP) in canine endocardial muscle tissueusing standard glass microelectrode under the control of an explicit diastolic interval (DI)control pacing protocol, i.e. feedback protocol. During sequential sinusoidal DI activation,the trajectory of APD dynamics has multiple values of APD correspondent to the sameDI, i.e. restitution is a bi-modal relationship. Our results indicate that: 1) there is a delay,similar to hysteresis, of change in APD responding to change in DI, 2) and the timecourse of the delay is asymmetric for fast or …

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Oxidative Stress And Redox Proteomics Studies In Models Of Neurodegenerative Disorders: I. The Canine Model Of Human Aging; Ii. Insights Into Successful Aging; And Iii. Traumatic Brain Injury, Wycliffe Omondi Opii Jan 2006

Oxidative Stress And Redox Proteomics Studies In Models Of Neurodegenerative Disorders: I. The Canine Model Of Human Aging; Ii. Insights Into Successful Aging; And Iii. Traumatic Brain Injury, Wycliffe Omondi Opii

University of Kentucky Doctoral Dissertations

The studies presented in this dissertation were conducted with the objective ofgaining greater understanding into the mechanisms of successful aging, the role ofmitochondria dysfunction in traumatic brain injury, and also on the mechanisms ofimproved learning and cognitive function in the aging.Aging is usually characterized by impairments in physiological functionsincreasing its susceptibility to dementia and neurodegenerative disorders. In thisdissertation, the mechanisms of dementia-free aging were investigated. The use of anantioxidant fortified diet and a program of behavioral enrichment in the canine model ofhuman aging was shown to result in a significant decrease in the levels of oxidativestress. A proteomic analysis of …

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Dynamic Freeway Travel Time Prediction Using Single Loop Detector And Incident Data, Jingxin Xia Jan 2006

Dynamic Freeway Travel Time Prediction Using Single Loop Detector And Incident Data, Jingxin Xia

University of Kentucky Doctoral Dissertations

The accurate estimation of travel time is valuable for a variety of transportation applications such as freeway performance evaluation and real-time traveler information. Given the extensive availability of traffic data collected by intelligent transportation systems, a variety of travel time estimation methods have been developed. Despite limited success under light traffic conditions, traditional corridor travel time prediction methods have suffered various drawbacks. First, most of these methods are developed based on data generated by dual-loop detectors that contain average spot speeds. However, single-loop detectors (and other devices that emulate its operation) are the most commonly used devices in traffic monitoring …

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Analysis, Design, And Laboratory Evaluation Of A Distributed Unified Power Flow Controller Concept, Qiang Li Jan 2006

Analysis, Design, And Laboratory Evaluation Of A Distributed Unified Power Flow Controller Concept, Qiang Li

University of Kentucky Doctoral Dissertations

A single-phase, buck-boost based, dual-output AC-DC converter is studied in this thesis. The converter has two DC outputs with opposite polarities, which share the same ground with the input power line. The power stage performance, including the input filter, is studied and procedure to select power components is given. The circuit model is analyzed to develop appropriate control. Zerocrossing distortion of the source input current is addressed and a solution is proposed. Experimental results are satisfactory in that a high power factor line current results for steady-state operation.

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Thermal Heat Transport At The Nano-Scale Level And Its Application To Nano-Machining, Basil T. Wong Jan 2006

Thermal Heat Transport At The Nano-Scale Level And Its Application To Nano-Machining, Basil T. Wong

University of Kentucky Doctoral Dissertations

Nano-manufacturing is receiving significant attention in industry due to the ever-growing interest in nanotechnology in research institutions. It is hypothesized that single-step or direct-write nano-scale machining might be achieved by coupling nano-probe field emission with radiation transfer. A laser may be used to heat a workpiece within a microscopic region that encloses an even smaller nanoscopic region subjected to a focused electron beam. The electron-beam supplies marginal heat sufficient to remove a minute volume of material by evaporation or sublimation. Experimentally investigating this hypothesis requires an estimate of the power needed in the electron-beam. To this end, a detailed numerical …

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A Numerical Study Of A New Spray Applicator, Vedanth Srinivasan Jan 2006

A Numerical Study Of A New Spray Applicator, Vedanth Srinivasan

University of Kentucky Doctoral Dissertations

This study focuses on the design and development of a new spray applicator design utilizing effects of imposed pressure oscillations in conjunction with cavitation collapse energy to create distribution of fine droplets. An oscillating horn placed inside the nozzle performing high frequency oscillations is envisioned to provide the necessary pressure perturbations on the exiting liquid jet, while the nozzle geometry design in configured to amplify cavitation process. Initially, a two-zone approach modeling the nozzle interior and exterior in a separate fashion and later, a coupled strategy is proposed. Parametric studies describing the effect of horn stroke length, frequency, its position …

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Deeper Groundwater Flow And Chemistry In The Arsenic Affected Western Bengal Basin, West Bengal, India, Abhijit Mukherjee Jan 2006

Deeper Groundwater Flow And Chemistry In The Arsenic Affected Western Bengal Basin, West Bengal, India, Abhijit Mukherjee

University of Kentucky Doctoral Dissertations

Natural attenuation of trichloroethene (TCE) and technetium (99Tc) was studied for five consecutive seasons (from January 2002 to January 2003) in Little Bayou Creek. The stream receives ground water discharge from an aquifer contaminated by past waste disposal activities at the Paducah Gaseous Diffusion Plant (PGDP), a uranium enrichment facility near Paducah, Kentucky. Results from stream gaging, contaminant monitoring, tracer tests (with bromide, nitrate, rhodamine WT and propane) and simulation modeling indicate the TCE is naturally attenuated by volatilization and dilution, with volatilization rates related to the ambient temperature and surface discharge rate. The only apparent mechanism of 99Tc attenuation …

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New Ultra-Lightweight Stiff Panels For Space Apertures, Jonathan T. Black Jan 2006

New Ultra-Lightweight Stiff Panels For Space Apertures, Jonathan T. Black

University of Kentucky Doctoral Dissertations

Stiff, ultra-lightweight thermal-formed polyimide panels considered in this dissertation are examples of next generation gossamer structures that resolve some of the technology barriers of previous, membrane-dominated gossamer designs while maintaining their low mass and low stowage volume characteristics. The research involved statically and dynamically characterizing and modeling several of these panels to develop validated computer models which can be used to determine the effects of changing manufacturing parameters and scalability. Static characterization showed substantial local nonlinear behavior that was replicated by new physics-based finite element models, and global linear bending behavior that was modeled using classical shell finite elements incorporating …

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Two-Dimensional Simulation Of Solidification In Flow Field Using Phase-Field Model|Multiscale Method Implementation, Ying Xu Jan 2006

Two-Dimensional Simulation Of Solidification In Flow Field Using Phase-Field Model|Multiscale Method Implementation, Ying Xu

University of Kentucky Doctoral Dissertations

Numerous efforts have contributed to the study of phase-change problems for over a century|both analytical and numerical. Among those numerical approximations applied to solve phase-transition problems, phase-field models attract more and more attention because they not only capture two important effects, surface tension and supercooling, but also enable explicitly labeling the solid and liquid phases and the position of the interface. In the research of this dissertation, a phase-field model has been employed to simulate 2-D dendrite growth of pure nickel without a flow, and 2-D ice crystal growth in a high-Reynolds-number lid-driven-cavity flow. In order to obtain the details …

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Theory And Application Of Helium And Helium-Like Ions In Astrophysical Environments, Ryan Lucian Porter Jan 2006

Theory And Application Of Helium And Helium-Like Ions In Astrophysical Environments, Ryan Lucian Porter

University of Kentucky Doctoral Dissertations

A complete model of helium-like line and continuum emission in astrophysical plasmas has been incorporated into the plasma simulation code CLOUDY. All elements between He and Zn are treated, any number of levels can be considered, and a full treatment of radiative and collisional processes is included. This includes photoionization from all levels, line transfer including continuum pumping and destruction by background opacities, scattering, and collisional processes. The model is calculated self-consistently with the ionization and thermal structure of the surrounding nebula. The result is a complete line and continuum spectrum of the nebula. The model helium atom is described …

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Can Trust Be Learned In Heterogeneous Environmetns? An Integrative Model Of Political And Social Learning Through Democracy, Satoshi Machida Jan 2006

Can Trust Be Learned In Heterogeneous Environmetns? An Integrative Model Of Political And Social Learning Through Democracy, Satoshi Machida

University of Kentucky Doctoral Dissertations

While the virtues of social capital in democracies are widely recognized, previous studies have repeatedly shown that social capital is in short supply in heterogeneous communities with ethnic minorities. Against the view that levels of social capital are culturally predetermined, I argue that it is possible to generate social capital by carefully formulating political institutions. Drawing from theories of institutional management of ethnic conflict and theories of institutional learning, I construct an integrated theory of social capital which hypothesizes that citizens learn to trust one another based on their experiences with political institutions during an extended period of democratic rule. …

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Loading And Recovery Behavior Of The Human Lumbar Spine Under Static Flexion, Guntulu Selen Hatipkarasulu Jan 2006

Loading And Recovery Behavior Of The Human Lumbar Spine Under Static Flexion, Guntulu Selen Hatipkarasulu

LSU Doctoral Dissertations

Musculoskeletal disorders account for 32 percent of work related injuries and illnesses. Extensive studies have been conducted to understand and explore the factors that affect the development of musculoskeletal disorders to provide effective control strategies. One of the most important factors that allow effective control strategies is the biomechanical factors. Among the biomechanical risk factors, exposures to repetitive static and vibratory activities are known to result in musculoskeletal disorders. A ligamento–muscular reflex activity exists in humans and animals to stabilize the knee, shoulder, elbow, ankle joints, and spine. This reflex activity decreases over time when static loading is applied, which …

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Louisiana Cotton, Rice, Soybean And Sugarcane Farmer Stakeholders: Who Are They And What Are Their Perceptions Of Farming Practices As Related To The Environment, Robert James Soileau Jan 2006

Louisiana Cotton, Rice, Soybean And Sugarcane Farmer Stakeholders: Who Are They And What Are Their Perceptions Of Farming Practices As Related To The Environment, Robert James Soileau

LSU Doctoral Dissertations

This study identified the stakeholders of Louisiana plant commodity farmers and rated them in terms of importance. Findings of this study show that farmers/ranchers, LSU AgCenter Experiment Station Research personnel, family, consumers, farm labor and agriculture chemical, fertilizer and seed dealers are the most important stakeholders. The second aspect of this study was to discover the stakeholder perceptions of agricultural practices and their relationship to the environment. An environmental perceptions survey was conducted with two of the most important stakeholder groups identified – Experiment Station Research Faculty associated with plant commodities and Louisiana consumers. LSU AgCenter Experiment Station Research Faculty …

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Communicating The Modern Entrepreneurial University In The 21st Century: A Case Study Of Academic Capitalism And Media Messaging In The Pursuit Of Revenues And National Prominence At Louisiana State University, Charles F. Zewe Jan 2006

Communicating The Modern Entrepreneurial University In The 21st Century: A Case Study Of Academic Capitalism And Media Messaging In The Pursuit Of Revenues And National Prominence At Louisiana State University, Charles F. Zewe

LSU Doctoral Dissertations

American public universities have passed through three stages of development: the religious, the philanthropic/land-grant, and the federal research university. Squeezed by government budget cuts and demands for more money to pay for research and faculty raises, U.S. higher education has entered a fourth phase, the entrepreneurial university. Public universities are increasingly capitalizing on the intellectual property of their faculty and students to sustain themselves and expand. Administrators spout free-market rhetoric as faculty attempt to commercialize research by creating spin-off companies. Using Louisiana State University as a case study, this dissertation, applies a combination of organizational knowledge creation and resource dependence …

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Once Proud Princes: Planters And Plantation Culture In Louisiana's Northeast Delta, From The First World War Through The Great Depression, James Matthew Reonas Jan 2006

Once Proud Princes: Planters And Plantation Culture In Louisiana's Northeast Delta, From The First World War Through The Great Depression, James Matthew Reonas

LSU Doctoral Dissertations

The Delta country of northeast Louisiana is a richly productive alluvial region stretching south from the Arkansas line to the confluence of the Red and Mississippi Rivers below Natchez. As the source of great cotton fortunes made during antebellum times, it reflected the Old South ideal and, for several decades after the end of the Civil War, remained firmly grounded in this old plantation culture. The economic depression of the 1890s and the coming of the boll weevil in the early 1900s, however, signaled a gradual decline that turned into full-blown dissolution in the years following the First World War. …

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The Effectiveness Of Virtual Facilitation In Supporting Gdss Appropriation And Structured Group Decision Making, Harold Joseph Lagroue Jan 2006

The Effectiveness Of Virtual Facilitation In Supporting Gdss Appropriation And Structured Group Decision Making, Harold Joseph Lagroue

LSU Doctoral Dissertations

Since their introduction a quarter of a century ago, group decision support systems (GDSS) have evolved from applications designed primarily to support decision making for groups in face-to-face settings, to their growing use for “web conferencing,” online collaboration, and distributed group decision-making. Indeed, it is only recently that such groupware applications for conducting face-to-face, as well as “virtual meetings” among dispersed workgroups have achieved mainstream status, as evidenced by Microsoft’s ubiquitous advertising campaign promoting its “Live Meeting” electronic meeting systems (EMS) software. As these applications become more widely adopted, issues relating to their effective utilization are becoming increasingly relevant. This …

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Leadership For Scholarly Excellence: A Qualitative Examination Of Department Chair Facilitation Methods To Promote Research Productivity In Pre-Tenure Biological Sciences Faculty, Todd Anthony Pourciau Jan 2006

Leadership For Scholarly Excellence: A Qualitative Examination Of Department Chair Facilitation Methods To Promote Research Productivity In Pre-Tenure Biological Sciences Faculty, Todd Anthony Pourciau

LSU Doctoral Dissertations

Leading a large, highly productive department that must compete on the global stage requires an increasingly broad skill-set. This study investigates whether there are methods that life science department chairs can employ to enhance the research productivity of their pre-tenure faculty and examines if leadership at the department chair level matters. Using a qualitative approach to examine six highly successful life science departments and their leaders as well as focus group interviews with nine pre-tenure faculty members, this study brings new discovery to the field of department chair leadership. This study validates the importance of department chair leadership while revealing …

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Role Of Hydrocarbon Pollutants, Salinity, Tidal Height, Bioenergetics And Competition In Colonization Of Oyster Reefs By Commensal Assemblages, Yasoma Dhammika Hulathduwa Jan 2006

Role Of Hydrocarbon Pollutants, Salinity, Tidal Height, Bioenergetics And Competition In Colonization Of Oyster Reefs By Commensal Assemblages, Yasoma Dhammika Hulathduwa

LSU Doctoral Dissertations

Effects of hydrocarbons, salinity, tidal height, bioenergetics and competition on the oyster reef fauna were studied. Dried oyster shell was exposed to crude oil in the laboratory and plastic trays filled with control and oil-exposed shell were then deployed at two locations, in two seasons and at two tidal levels, with immersion periods of two and five weeks. Salinity exhibited a significant effect with sub tidal site having higher diversity. Hydrocarbon effects were less prominent. To determine effects of cleaners, Corexit 9580 was applied both alone and in combination with oil on cultch. At high concentrations, the cleaner ameliorated hydrocarbon …

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Adaptive Scalable Protocols For Heterogeneous Wireless Networks, Vamsi Krishna Paruchuri Jan 2006

Adaptive Scalable Protocols For Heterogeneous Wireless Networks, Vamsi Krishna Paruchuri

LSU Doctoral Dissertations

The focus of this dissertation is to propose analytical models to study the impact of collisions and interference in heterogeneous wireless networks and propose simple scalable and lightweight protocols that use these models to adapt to network conditions thus increasing efficiency, decreasing energy consumption and prolonging network lifetime. The contributions of this dissertation are multifold and are summarized as follows: - Analytical models to study the impact of collisions and interference on both broadcast and unicast messages. These analytical models are incorporated into the proposed protocols to adapt to the prevailing network conditions to improve their performance. - Optimized Flooding …

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Spectral Analysis Of Total Suspended Solids Mixtures For Solids Composition Determination, Curtis W. Sutherland Jan 2006

Spectral Analysis Of Total Suspended Solids Mixtures For Solids Composition Determination, Curtis W. Sutherland

LSU Doctoral Dissertations

Total Suspended Solids (TSS) analysis provides an initial and very basic measure for study and characterization of water quality. The present tedious procedures used for the identification of different solids constituents present in TSS and for the classification or insight into the origins of those solids are time-consuming and expensive. The research reported herein investigates the use of instrumental analysis using reflectance spectra of TSS as an attractive alternative to sufficiently characterize and identify TSS in a more rapid and economical method that could be used to study TSS transport and to identity TSS points of origin. For this investigative …

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Dynamics Of Globalization In Philippine Scientific Communities, Marcus Antonius Hidalgo Ynalvez Jan 2006

Dynamics Of Globalization In Philippine Scientific Communities, Marcus Antonius Hidalgo Ynalvez

LSU Doctoral Dissertations

This research attempts to shed light on the simultaneous influence of scientifically strong countries on Internet use and knowledge production at the global periphery. Using survey data from interviews of 312 Filipino scientists, this study answers the following questions: (1) Does place of graduate education (i.e., Australia, Japan, the United States and the Philippines) configure scientists’ Internet use? (2) Does Internet use shape scientists’ professional network? (3) Does place of graduate education, Internet use and professional network influence collaboration and research productivity? and (4) How does collaboration relate to productivity when professional network is accounted for? Results show that digital …

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A Stochastic Mesoscopic Cell-Transmission Model For Operational Analysis Of Large-Scale Transportation Networks, Ciprian Danut Alecsandru Jan 2006

A Stochastic Mesoscopic Cell-Transmission Model For Operational Analysis Of Large-Scale Transportation Networks, Ciprian Danut Alecsandru

LSU Doctoral Dissertations

The cell transmission model (CTM), developed by Daganzo in 1994 was not fully exploited as an operations model for analysis of large-scale traffic networks. Because of its macroscopic / mesoscopic features, CTM offers calibration and computational advantages over microscopic models. This study presents a series of enhancements to the original form of CTM. These enhancements show potential to increase the model’s accuracy and realism of traffic flow representation. For example, topological enhancements and modifications to the flow advancing equation are introduced to allow variable cell lengths and non-discrete movements of vehicles between cells. In addition, implementation of lane-changing behavioral logics …

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The Multiple Dimensions Of The Interfirm Network: The Critical Sources Of Product Innovation, Thongchai Srivardhana Jan 2006

The Multiple Dimensions Of The Interfirm Network: The Critical Sources Of Product Innovation, Thongchai Srivardhana

LSU Doctoral Dissertations

This dissertation examines the impacts of interfirm variables on both invention and commercialization activities, following Greve’s (2003) suggestion that innovation research will be enriched if more studies integrate invention and commercialization activities to understand the entire innovation development process. Utilizing two established theoretical perspectives—organizational learning and institutional theory—six sets of hypotheses are developed containing the following interfirm variables: 1) direct and indirect ties, 2) strength of direct ties, 3) structural holes, 4) prominence of direct partners, 5) exploration and exploitation partners, and 6) horizontal and vertical networks. The dissertation also predicts that these interfirm variables would contribute to either invention …

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