No description available.

No description available.

No description available.

Quality management is a significant component of any construction project and the cost of quality can constitute a sizable part of total construction cost. US state highway agencies are in constant pressure to do more with less. Applying Lean construction management principles can be a viable way to eliminate waste and inefficiencies and maximize value and efficiency in quality assurance (QA). State highway agencies have implemented various QA practices and processes which include different QA standards and specifications, varying testing methods, central testing lab vs. on site testing, performance based vs. prescribed quality assurance practices, implementation of innovative quality assurance practices, etc. Therefore, there is an opportunity to assess different QA strategies and recommend lean QA practices that are cost effective. A survey was conducted among state highway agencies, which provided a detailed mapping of various QA practices and processes used as part of QA programs and identified areas where agencies can focus on for cost savings. The survey found that QA sampling and testing plans, optimization of sampling plans, optimization of QA standards and specifications, and implementation of innovative test methods and processes are the main areas the agencies should focus on to lean the current QA programs.

As environmental impact and environmental emissions are an important part of today's society, due to climate change, high demands are placed on material selection, how the product is recycled and how the product is remanufactured. Remanufacturing is by definition to manufacture an old product into a new product Remanufacturing is an important process to get a sustainable life in the industries, this is because of the increased consumption of products and technique that are thrown away near the products end-of-life. Remanufacturing is a process applied to a product or a part near its end-of-life to transform a used product to a like-new product. At present, remanufacturing is a process that is not used as much in the marine world as other transportation industries, such as automotive and rail. At present, the remanufacturing process is only applying on smaller structures such as engines, propeller shafts, compressors and pumps.  This project work aimed to investigate the effects of implementing remanufacturing into Onmar products. In order to study how remanufacturing affects a company, an analysis was carried out on the company's Rail actuator to study the effects of implementing remanufacturing into the product. Since there are high demands on how the product is designed, an analysis was carried out on how the rail actuator was designed to meet the criteria set. This resulted in two different covers being produced in order to meet the requirements needed to carry out remanufacturing on the product. By implementing remanufacturing on the rail actuator resulted in large savings on energy consumption, material recycling, manufacturing costs, raw materials and carbon dioxide emissions when manufacturing new material.

This dissertation consists of two essays on the impact of hope on financial decision making. While hope is a commonly experienced positive emotion, research on the impact of hope on consumer decision making is relatively sparse. The first essay examines the impact of hope on gambling intentions. Findings from seven studies, including one consequential, demonstrate that in a gambling context, hope leads to suboptimal decisions when the focus of hope is on winning. We theorize and show empirically that this effect occurs because hope triggers experiential processing, which in turn increases gambling, interestingly without affecting rational expectations of winning. Evidence from a variety of gambling contexts suggest that hope leads to both intent and actual gambling behavior. This effect of hope on gambling does not hold for individuals low on trait experiential processing and is attenuated when individuals are prompted to not rely on their feelings. Thus, the authors contribute to the literature on hope by providing a detailed understanding of how hope impacts processing of information, which in turn leads to suboptimal decisions in a gambling context. More broadly, this work offers implications for policy makers and consumers to understand and to become aware of how everyday positive emotion can be detrimental to consumer welfare. The second essay examines the impact of hope on savings. Across five studies, this research displays that hope increases willingness to save. The effect of hope on savings intention is mediated by hope's focus on the future. When hope is no longer focused on the future but is instead focused on the past, this effect disappears. To rule out positive emotion in general as a driving effect, we examine pride, a positive emotion which is generally focused on the past and find that pride does not lead to savings intention unless the focus of pride is shifted to the future. We also examine an alternative potential explanation that a sense of closeness with one's future self is driving the effect of hope on savings intention but do not find support for this, rather it is a future time perspective that mediates the effect of hope on willingness to save. These findings and their implications for research on positive emotion, time perspective and financial decision making are discussed. / Doctor of Philosophy / This study consists of two essays on hope's impact on consumer decision making. Essay 1 examines a negative side of hope, namely how hope may motivate gambling intentions. Although hope is commonly thought of as a positive entity, could hope actually trap an individual, leading to suboptimal decisions? We find that hope of winning increases gambling intentions through experiential (or emotional) processing. When individuals are instructed to not rely on their feelings, this impact of hope on gambling intentions disappears. We also find that for individuals who tend not to utilize experiential processing, there is no impact of hope on gambling. Essay 2 looks at a positive consequence of hope: how hope motivates savings. We find that hope's focus on the future leads to motivation to save for one's future. When the focus of hope is shifted to the past, the impact of hope on saving disappears. We compare hope to another positive emotion, pride, as pride differs from hope by its typical focus on the past. We find that pride does not motivate savings unless its focus is shifted to the future. We rule out an alternative explanation for why hope may motivate savings by looking at sense of closeness with one's future self. We find that while a future time perspective mediates hope's impact on savings, sense of closeness with one's future self does not. The findings from these two essays add to the scarce literature on hope's impact on consumer decision making by providing two contrasting consequences of hope.

Not too long ago, commercial supersonic aircraft flights were part of the air transportation system. In the 1970's we had the Russian-built Tupolev Tu-144 and the BAC/Aerospatiale Concorde, the latest being tin operation for 27 years. The work documented in this dissertation focused on the viability of bringing back supersonic aircraft as a transportation mode. Throughout three years, Virginia Tech and a team from NASA have been combining efforts to develop a model capable of predicting future air travel demand for supersonic vehicles. The model can predict future supersonic commercial services and allows aircraft designers from NASA to optimize aircraft performance and characteristics by maximizing the potential air travel demand. The final product of this study was the development of the Low-Boom Supersonic Aircraft Model (LBSAM). The development progress took three years to be completed, and during each year, a version of the model with the preliminary predictions was made available to NASA. Each of the three versions of the model predicts future supersonic commercial services. What differentiates each version is the data, method, and aircraft type/design implemented; the latest version of the model is more realistic and provides a higher number of functionalities. The first version of the model predicted the possible supersonic commercial service for three aircraft types: each with two variations. An 18-seat, 40-seat, and 60-seat low-boom and non-low-boom aircraft were analyzed. The second version of the model analyzed a 20-seat and 40-seat low-boom, non-low-boom aircraft with restrictions and non-low-boom aircraft without restrictions. The latest version of the model tries to estimate potential demand for a 43-seat and a 52-seat supersonic low-boom aircraft design. The low-boom concept refers to the implementation of technology that reduces the loudness of a sonic boom. A non-low-boom concept refers to an aircraft flying faster than Mach 1 with the technology's implementation that reduces the loudness of a sonic boom. The final results suggest that for a 52-seat LBSA, the potential worldwide demand is as follows. • 33.4 million seats worldwide. Assuming an overland range of 3,200 nm., an overland Mach 1.7, and an overland fuel scale factor of 0.98. • 772 aircraft needed worldwide. Assuming an overland range of 2,800 nm., an overland Mach 1.7, and an overland fuel scale factor of 0.90. • 1,032 one-way OD pairs where LBSA can operate. Assuming an overland range of 2,800 nm., an overland Mach 1.7, and an overland fuel scale factor of 0.90. The LBSAM is mainly driven by the cost per passenger mile values calculated for each one-way Origin-Destination (OD) pair. Additional uncertainties in the model include the market share and annual aircraft utilization. The market share refers to the percent of the demand that will switch from current subsonic commercial services to commercial supersonic services. During the three-year work, we considered a market share of 50% and 100%. Aircraft utilization refers to the number of hours that the airline will be able to use the aircraft. The majority of the projections were based on a 3,500-hour aircraft utilization. / Doctor of Philosophy / Not too long ago, commercial supersonic aircraft flights were part of the air transportation system. An aircraft flying faster than the speed of sound is known as an aircraft flying at supersonic speed. Current commercial aircraft fly at subsonic speed. Subsonic speed refers to aircraft flying at a speed lower than the speed of sound. In the 1970's we had the Russian-built Tupolev Tu-144 and the BAC/Aerospatiale Concorde, the latest being tin operation for 27 years. The work documented in this dissertation focused on the viability of bringing back supersonic aircraft as a transportation mode. Throughout three years, Virginia Tech and a team from NASA have been combining efforts to develop a model capable of predicting future air travel demand for supersonic vehicles. The model can predict future supersonic commercial services and allows aircraft designers from NASA to optimize aircraft performance and characteristics by maximizing the potential air travel demand. The purpose of this dissertation effort is to provide a better understanding of what could be the potential commercial demand for supersonic flight in the near future. We consider all the benefits and characteristics of supersonic flight and studied in detail what percentage of the travelers might be willing to migrate from the current subsonic market to the supersonic market. We estimated this ratio by studying the spending behavior of passengers in the current market. How much more are passengers willing to pay to save time? We can infer how much travelers value their time by comparing direct flights versus flights with an intermediate stop. The results show that a demand of 33.4 million seats could be reached by the year 2040. The supersonic market would consist of more than one thousand one-way origin-destination pairs worldwide, and more than seven hundred supersonic aircraft are expected to satisfy the forecast demand.

Expanding urbanization, characterized by increased impervious surfaces and decreased tree canopy, is contributing to rising urban temperatures. This trend has implications for energy consumption, which strategically placed trees can modify by casting shade upon building and ground surfaces. However, urban densification, a paradigm of modern residential land development, often constrains space for planting shade trees. Thus, the overall objective of this dissertation was to investigate shade tree planting strategies and their effects on residential cooling and heating energy conservation for dense urban neighborhoods in U.S. cities on a latitudinal gradient. The first study used a computer program called Shadow Pattern Simulator to examine the effects of tree form, tree placement, and sunlight exposure on shade provision for a residential structure model. Simulation results affirmed the conventional strategy in northern latitudes that recommends planting shade trees on the east or west aspect for maximizing beneficial shade while avoiding tree plantings on the south aspect to minimize any heating penalty of undesirable shade. However, in southern latitudes, planting trees on southerly aspect should not be discounted because the shorter heating season lessens the detrimental heating penalty while providing beneficial season shade. The second study, using an energy simulation program called EnergyPlus, evaluated the effect of a single shade tree upon the energy consumption of the structure model. This study affirmed that energy conservation benefits are influenced by the quantity as well as the quality of tree shade upon building surfaces. In addition, interactions between sun angle, tree form, and tree placement were observed to influence tree shade effects on annual energy consumption. In the third study, based on the first two studies, an alternative tree placement strategy, which reconfigured tree placement around the residential structure, was developed to maximize cooling and heating energy savings while attenuating space conflicts. The alternative strategy was found to be as effective as the conventional strategy while being more responsive to parcel or building orientations in dense urban neighborhoods. Overall, understanding the fundamental interactions between tree form, tree placement, and geographic settings is critical for improving energy conservation benefits of shade trees in dense urban settings. / Ph. D.

Financial incentives offered by payers to health care providers and patients have been identified as a key mechanism to lower costs while improving quality of care. How to effectively design incentive programs that can align the varying objectives of health care stakeholders, as well as predict programs' performance and stakeholders' decision response is an unresolved research challenge. The objective of this study is to establish a novel approach based on multiscale decision theory (MSDT) that can effectively model and efficiently analyze such incentive programs, and the complex health care system in general. The MSDT model captures the interdependencies of stakeholders, their decision processes, uncertainties, and how incentives impact decisions and outcomes at the payer, hospital, physician, and patient level. In the first part of this thesis, we study the decision processes of agents pertaining to the investment and utilization of imaging technologies. We analyze the payer-hospital-physician relationships and later extend the model to include radiologist and patient as major stakeholders in the second part of this thesis. We focus on a specific incentive program, the Medicare Shared Savings Program (MSSP) for Accountable Care Organizations (ACOs). The multi-level interactions between agents are mathematically formulated as a sequential non-cooperative game. We derive the equilibrium solutions using the subgame perfect Nash equilibrium (SPNE) concept and the backward induction principle, and determine the conditions under which the MSSP incentive leads to the desired outcomes of cost reduction and quality of care improvements. In the third part of this thesis, we study the multi-level decision making in chronic disease management. We model and analyze patients' and physicians' decision processes as a general-sum stochastic game with perfect information and switching control structure. We incorporate the Health Belief Model (HBM) as the theoretical foundation to capture the behavioral aspect of agents. We analyze how incentives and interdependencies affect patients' engagement in health-promoting activities and physicians' delivery of primary care services. We show that a re-alignment of incentives can improve the effectiveness of chronic disease management. / Ph. D.

Retirement saving research frequently has investigated the differences between working men and working women and primarily focused on the near retirement and retirement years. There is limited research targeting young to old working-age women including those who do not work for pay and are unemployed. The purpose of this study was to examine what factors affect non-retired working-age (25 years and older) women's retirement saving behaviors, retirement savings, and retirement income satisfaction. To implement the study, a research framework was developed based on Deacon and Firebaugh's Family Resource Management Model. The research framework for this study consisted of three major sections: (a) input (demographics, saving motives, retirement saving involvement level, retirement information seeking, current financial assets and debts, and future expectations), (b) throughput (retirement saving behaviors such as calculating needed retirement savings, being a retirement saver, starting saving for retirement age, and being a regular retirement saver), and (c) output (the objective retirement savings and the subjective retirement income satisfaction). An online survey instrument was developed to obtain data for the study. Two pilot tests were conducted to confirm the validity and reliability of the instrument. Data for this study were collected from a national population between May 25, 2012 and May 30, 2012 with 591 valid responses. Several statistical methods were employed: descriptive statistics, one-way between-groups analysis of variance (ANOVA), direct logistic regression, and standard multiple regression. From the results of the study, only about one-third of the women (31.8%) reported they expect to get the full amount of Social Security retirement income that today's retirees get. However, around 60% of the women only save less than $25,000 or none in employer-provided retirement accounts or in personal investments and savings. There is an un-addressed gap between the cognition of the need to save for retirement and real saving action. A regular retirement saver is more likely to save more in employer-provided retirement accounts and to feel more satisfied with that retirement income. Yet, regular retirement savers have less savings in personal investments and savings, possibly because they believe their work investments will be sufficient or some women may make direct deposits to meet the annual limits of retirement plans. Other researchers have not reported this relationship. Those women who are more cognitively involved with saving for retirement are more likely to calculate needed retirement savings and to be a retirement saver, but they are less satisfied with retirement income from Social Security and from personal investments and savings. Satisfaction level is subjective; thus, those who expect to own more types of assets in retirement may have a higher satisfaction level with the expected income from both employer-sponsored retirement accounts and personal investments and savings. Generally, greater satisfaction with expected retirement income is associated with higher accumulation in retirement savings, and the female savers have much more retirement savings than non-savers. However, there is no difference in the retirement income satisfaction of savers and non-savers. These findings have implications for financial educators, counselors and advisors, researchers, employers, and policy makers. There are recommendations for women and future research. / Ph. D.