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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

To What Extent Do Ride-Hailing Services Replace Public Transit? A Novel Geospatial, Real-Time Approach Using Ride-Hailing Trips in Chicago

Breuer, Helena Kathryn 11 February 2021 (has links)
Existing literature on the relationship between ridehailing (RH) and transit services is limited to empirical studies that rely on self-reported answers and lack spatial and temporal contexts. To fill this gap, the research takes a novel approach that uses real-time geospatial analyzes. Using this approach, we estimate the extent to which ride-hailing services have contributed to the recent decline in public transit ridership. With source data on ridehailing trips in Chicago, Illinois, we computed the real-time transit-equivalent trip for the 7,949,902 ridehailing trips in June 2019; the sheer size of this sample is incomparable to the samples studied in existing literature. An existing Multinomial Nested Logit Model was used to determine the probability of a ridehailer selecting a transit alternative to serve the specific origin-destination pair, P(Transit|CTA) . The study found that 31% of RH trips are replaceable, 61% are not replaceable, and 8% lie within the buffer zone. We measured the robustness of this probability using a parametric sensitivity analysis, and performed a two-tailed t-test, with a 95% confidence interval. In combination with a Summation of Probabilities, the results indicate that the total travel time for a transit trip has the greatest influence on the probability of using transit, whereas the airport pass price has the least influence. Further, the walk time, number of stops in the origin and destination census tracts, and household income also have significant impacts on the probability of using transit. Lastly, we performed a Time Value Analysis to explore the cost and trip duration difference between RH trips and their transit-equivalent trips on the probability of switching to transit. The findings demonstrated that approximately 90% of RH trips taken had a transit-equivalent trip that was less expensive, but slower. The main contribution of this study is its thorough approach and fine-tuned series of real-time spatial analyzes that investigate the replaceability of RH trips for public transit. The results and discussion intend to provide perspective derived from real trips and encourage public transit agencies to look into possible opportunities to collaborate with ridehailing companies. Moreover, the methodologies introduced can be used by transit agencies to internally evaluate opportunities and redundancies in services. Lastly, we hope that this effort provides proof of the research benefits associated with the recording and release of ridehailing data. / Master of Science / Existing literature on the relationship between ridehailing (RH) and transit services is limited to empirical studies that rely on self-reported answers and lack spatial and temporal contexts. To fill this gap, the research takes a novel approach that uses real-time geospatial analyzes. Using this approach, we estimated the extent to which ride-hailing services have contributed to the recent decline in public transit ridership. With source data on ridehailing trips in Chicago, Illinois, we computed the real-time transit-equivalent trip for the 7,949,902 ridehailing trips in June 2019; the sheer size of this sample is incomparable to the samples studied in existing literature. An existing Multinomial Nested Logit Model was used to determine the probability of a ridehailer selecting a transit alternative to serve the specific origin-destination pair, P(Transit|CTA) . The study found that 31% of RH trips are replaceable, 61% are not replaceable, and 8% lie within the buffer zone. We measured the robustness of this probability using a parametric sensitivity analysis, and performed a two-tailed t-test, with a 95% confidence interval. In combination with a Summation of Probabilities, the results indicate that the total travel time for a transit trip has the greatest influence on the probability of using transit, whereas the airport pass price has the least influence. Further, the walk time, number of stops in the origin and destination census tracts, and household income also have significant impacts on the probability of using transit. Lastly, we performed a Time Value Analysis to explore the cost and trip duration difference between RH trips and their transit-equivalent trips on the probability of switching to transit. The findings demonstrated that approximately 90% of RH trips taken had a transit-equivalent trip that was less expensive, but slower. The main contribution of this study is its thorough approach and fine-tuned series of real-time spatial analyzes that investigate the replaceability of RH trips for public transit. The results and discussion intend to provide perspective derived from real trips and encourage public transit agencies to look into possible opportunities to collaborate with ridehailing companies. Moreover, the methodologies introduced can be used by transit agencies to internally evaluate opportunities and redundancies in services. Lastly, we hope that this effort provides proof of the research benefits associated with the recording and release of ridehailing data.
2

Regulating online ride-hailing platforms: comparing policy responses in Beijing and Shanghai to business conflicts and national policy

Wu, Yabo 20 August 2020 (has links)
Existing studies on the formulation of regulations for online ride-hailing platforms merely see the process as a struggle between interest groups. They do not address how policymakers perceive this struggle and act on their own initiative to govern these platforms. This study supplements existing studies by exploring how the metropolitan governments of two Chinese cities, Beijing and Shanghai, perceived conflicts between contending forms of chauffeur businesses and brought in regulations for new platform ventures. This thesis employs a policy change approach in the Chinese authoritarian context and reaches three conclusions. Firstly, it explains that the "special interests" of taxi entities institutionalized by the old regulatory regimes for taxi businesses incentivized the two metropolitan governments to protect taxi entities. Thus, even if Beijing and Shanghai had different first responses towards platforms with one initially emphasizing "cracking-down" and the other working on a "loose" regulatory approach, they adopted similar platform-capping policies. Secondly, this thesis finds that the two metropolitan governments cautiously disobeyed the central government's "loose" directives for platforms by combining their capping policies with selectively implementing a central directive of differentiating the markets of ride-hailing platforms and taxi operators. Thirdly, this thesis addresses obstructions to the establishment of "new regulation" that respects the business logic of platforms, which is proposed by the platform coalition. It argues that the interaction between the vested "special interests" and the fragmentation of authority makes local governments resistant to this "new regulation." / Graduate
3

Innovation & imitation : En taxibransch i förändring / Innovation & imitation : A changing taxi industry

Jäderlund, Jeanette, Björnfot, Freya January 2019 (has links)
Background: In recent years, the Swedish taxi industry has undergone a number of changes as a result of increased digitalisation in a deregulated market. Most market players have emerged as a result of the freedom of establishment, which in turn has led to higher competition. Among these new entrants, the ride-hailing business model has had an impact by taking a traditional service and performing it differently. This thesis will thus examine how this approach has affected the Swedish taxi industry in more detail. Purpose: The thesis aims to increase understanding of the aspects of the ride-hailing business model that are specifically distinguished by the company Uber. The following secondary purpose is to identify the impact this specific business model has on the Swedish taxi industry as a result of Uber's establishment on the Swedish market. Method: The thesis is an abductive case study of qualitative character. The empirical data has been collected through three distinct approaches, which are the collection of scientific material, semi-structured interviews with three respondents and a Social Media Analysis consisting of data from approximately 100 independent articles and media publications. Furthermore, these three types of empirical data have been selected via a strategic selection. Conclusion: The result of this thesis shows that the specific aspects that stand out in Uber Sweden's use of the ride-hailing business model are value creation, differentiation, innovation and social acceptance. The results also show that the ride-hailing business model has influenced the Swedish taxi industry in terms of the specific aspects' influence on the development of the taxi market and on government regulations. / Bakgrund: Under de senaste åren har den svenska taximarknaden genomgått en rad förändringar till följd av en ökad digitalisering på en avreglerad marknad. Det har uppkommit flertalet aktörer på marknaden till följd av den fria etableringsrätten, som i sin tur lett till en högre konkurrens. Bland dessa nya aktörer har affärsmodellen ride-hailing fått ett genomslag genom att ta en traditionell tjänst och utföra den annorlunda. Uppsatsen kommer därmed att närmare undersöka hur detta tillvägagångssätt har påverkat den svenska taximarknaden. Syfte: Uppsatsen syftar till att öka förståelsen för de aspekter av ride-hailing-affärsmodellen som specifikt utmärker sig hos företaget Uber. Det följande sekundära syftet avser att identifiera den påverkan som denna specifika affärsmodell haft på den svenska taxibranschen till följd av Ubers etablering på den svenska marknaden. Metod: Uppsatsen är en abduktiv fallstudie av kvalitativ karaktär. Empiri har insamlats via tre distinkta tillvägagångssätt, vilka är insamlande av vetenskapligt material, semistrukturerade intervjuer med tre respondenter samt en Social Media Analys bestående av data från cirka 100 fristående artiklar samt mediala publikationer. Vidare har dessa tre typer av empiriska data valts ut via ett strategiskt urval. Slutsats: Resultatet från denna uppsats visar att de specifika aspekterna som utmärker sig inom Uber Sveriges användning av ride-hailing-affärsmodellen är värdeskapande, differentiering, innovation och social acceptans. Vidare visar resultatet på att ride-hailing-affärsmodellen har påverkat den svenska taximarknaden i avseende på de specifika aspekternas inflytande på utvecklingen av taxibranschen samt kring statliga regleringar.
4

Fleet management strategies for urban Mobility-on-Demand systems

Chaudhari, Harshal Anil 23 February 2022 (has links)
In recent years, the paradigm of personal urban mobility has radically evolved as an increasing number of Mobility-on-Demand (MoD) systems continue to revolutionize urban transportation. Hailed as the future of sustainable transportation, with significant implications on urban planning, these systems typically utilize a fleet of shared vehicles such as bikes, electric scooters, cars, etc., and provide a centralized matching platform to deliver point-to-point mobility to passengers. In this dissertation, we study MoD systems along three operational directions – (1) modeling: developing analytical models that capture the rich stochasticity of passenger demand and its impact on the fleet distribution, (2) economics: devising strategies to maximize revenue, and (3) control: developing coordination mechanisms aimed at optimizing platform throughput. First, we focus on the metropolitan bike-sharing systems where platforms typically do not have access to real-time location data to ascertain the exact spatial distribution of their fleet. We formulate the problem of accurately predicting the fleet distribution as a Markov Chain monitoring problem on a graph representation of a city. Specifically, each monitor provides information on the exact number of bikes transitioning to a specific node or traversing a specific edge at a particular time. Under budget constraints on the number of such monitors, we design efficient algorithms to determine appropriate monitoring operations and demonstrate their efficacy over synthetic and real datasets. Second, we focus on the revenue maximization strategies for individual strategic driving partners on ride-hailing platforms. Under the key assumption that large-scale platform dynamics are agnostic to the actions of an individual strategic driver, we propose a series of dynamic programming-based algorithms to devise contingency plans that maximize the expected earnings of a driver. Using robust optimization techniques, we rigorously reason about and analyze the sensitivity of such strategies to perturbations in passenger demand distributions. Finally, we address the problem of large-scale fleet management. Recent approaches for the fleet management problem have leveraged model-free deep reinforcement learning (RL) based algorithms to tackle complex decision-making problems. However, such methods suffer from a lack of explainability and often fail to generalize well. We consider an explicit need-based coordination mechanism to propose a non-deep RL-based algorithm that augments tabular Q-learning with a combinatorial optimization problem. Empirically, a case study on the New York City taxi demand enables a rigorous assessment of the value, robustness, and generalizability of the proposed approaches.
5

OPEN CHALLENGES IN DIGITAL PLATFORMS: IMPACT OF OPERATIONAL STRATEGIES ON BUSINESS PERFORMANCE

Guha, Samayita January 2022 (has links)
In the digital age, with the accelerating pace of e-commerce, online platforms such as Amazon, Yelp, TripAdvisor, Facebook, Netflix, Uber and others have gained in prominence. Furthermore, in the wake of the COVID-19 pandemic, even businesses which were heretofore primarily brick-and-mortar have had to shift to a strong online presence in order to adapt and survive; which, while beneficial to all stakeholders, has resulted in dire challenges for the producers/service providers, platform owners, as well as consumers. In my first essay, I investigate the challenges faced by mobility as a service (MaaS) platforms such as Uber and Lyft for managing their demand and the pool of available drivers. On one hand, driver compensation issues in MaaS platforms is a highly discussed topic. On the other hand, the MaaS platforms are expanding to encompass several external businesses in search of profitability. In this chapter, I focus primarily on driver compensation issues in MaaS platforms when the platforms engage in external businesses. I find that in the majority of instances, the driver compensation reduces when the platforms get involved in external businesses; however, there are a few cases, where it leads to an increment in driver compensation, thus benefiting them. The second essay is on the impact of online reviews from digital platforms such as Yelp and TripAdvisor on business performance. Using a data set from Yelp, first, I study the interaction of average rating and number of reviews on business performance; second, how competition affects the interaction effect of the average rating and number of reviews on the focal business' performance. I find that the impact of the interaction of average rating and number of reviews on business performance is different at various levels of average ratings, and the inclusion of competition negatively influences the interaction effect of the average rating and number of reviews on the performance of the focal restaurant. In my third essay, I analyze how the interaction of supplier encroachment and consumer showrooming impacts an omnichannel retailer and her upstream manufacturer, who encroaches the downstream retailer's market with an online direct sales channel. I identify different scenarios in a covered market where either the retailer, or the manufacturer, or both will be better off. Taken together, these three essays provide valuable managerial insights for real world business problems, which will empower researchers in academia and industry managers, and help them improve their businesses and maximize their operational performance. / Business Administration/Marketing
6

Forecasting Ride-Hailing Across Multiple Model Frameworks

Day, Christopher Stephen 05 December 2022 (has links)
The advent of on-demand transport modes such as ride-hailing and microtransit has challenged forecasters to develop new methods of forecasting the use and impacts of such modes. In particular, there is some professional disagreement about the relative role of activity-based transportation behavior models -- which have detailed understanding of the person making a trip and its purpose -- and multi-agent demand simulations which may have a better understanding of the availability and service characteristics of on-demand services. A particular question surrounds how the relative strengths of these two approaches might be successfully paired in practice. Using daily plans generated by the activity-based model ActivitySim as inputs to the BEAM multi-agent simulation, we construct nine different methodological combinations by allowing the choice to use a pooled ride-hail service in ActivitySim, in BEAM with different utility functions, or in both. Within each combination, we estimate ride-hailing ridership and level of service measures. The results suggest that mode choice model structure drastically affects ride-hailing ridership and level of service. In addition, we see that multi-agent simulation overstates the demand interest relative to an activity-based model, but there may be opportunities in future research to implement feedback loops to balance the ridership and level of service forecasts between the two models.
7

Market Design for Next Generation of Shared and Electric Transportation Systems: Modeling, Optimization, and Learning

Shao, Shiping January 2022 (has links)
No description available.
8

Empirics of firms' strategies in new industries

Yan, Fangning 23 November 2022 (has links)
This dissertation consists of three essays on the empirics of firms' strategies in new industries. In the first chapter, I study the spatial mismatch between consumers and bikes in the dockless bike-sharing industry and an externality exacerbating the problem: when a consumer uses a bike for a low and inflexible price, she both displaces another consumer's usage for a potential higher-value trip, and may ride the bike to unpopular destinations. With a trip-level dataset of a bike-sharing company in Beijing, China, I develop a spatial structural model to estimate the demand for bikes with search frictions and local matchings. Compared to the scenario in which consumers always get bikes immediately, I find that local spatial mismatch between consumers and bikes reduces the total usage by 29.95%, or a net loss of 332,979 trips. Counterfactual analyses show that (1) doubling the number of bikes increases the trip volume by 28.46% while halving the number of bikes decreases the trip volume by 46.40%; (2) price-discriminating against short trips by 2% increases the total trip time by 0.22%; and (3) changing the frequency of bike reshuffling does not have a significant impact on the total usage of bikes. In the second chapter, I study how efficient capital markets are in supplying funds to new firms by looking at how a platform start-up, ofo, made its investment decisions in response to capital infusions. I fit the business performance of ofo, a bike-sharing platform start-up, in China and show how its financial conditions affected investment decisions. I analyze the effects of funding rounds from venture capitalists on the investment and business of the company with an event study framework. My estimates find that the firm increased its users and bikes by about 40% two weeks before receiving funds, suggesting that it spent much more on bike fleet and promotional offers in expectation of capital infusions. I also show that such boosts in business performance were short-lived: the number of trips and users often returned to normal levels two weeks after the funding day. My findings suggest that the capital market is inefficient in supplying funds to start-up companies. In the third chapter, I study the shakeout in the U.S. automobile industry with data retrieved from old annals of the automobile industry. I simulate a research productivity model and see if I could successfully trigger a shakeout. I find that only the cost reduction from technology advancements is not enough to trigger an industry shakeout and propose that more extreme settings are needed for further studies.
9

The Uber Boundary : Contextualizing the Organizational Boundary of a Digital Platform Organization

Furulind, Johanna, Sjöqvist, Olivia January 2019 (has links)
Digital platform organizations challenges the organizational landscape by utilizing technology enabling cost efficient transactions. Uber is a commonly known example of such an organization, where tensions have arisen in various local contexts due to that the organization draw their boundary tightly around the platform to the benefit of organizational efficiency. Uber has as a consequence, been highly questioned in its liability of their primary operations: Is it a technology platform, or a transportation firm?   This thesis sets out to answer:  How is the organizational boundary of Uber challenged in various local contexts? The purpose is to provide an explanation towards how the organizational boundary of a digital platform organization could be understood in relation to local context, and how it can or cannot evolve in regards to these contexts. The results show that context matters for the boundary of Uber. In addition, a pattern amongst the context specific events emerged influencing the boundary. These can be categorized into four configurations: Adjusting, Expanding, Withdrawing and Intertwining. Each of the configurations explain the underlying reasons for the varying fluctuations the boundary of Uber show, and thus answer how the organizational boundary of Uber is challenged in various local contexts.
10

Impacto económico, social y medioambiental de la liberalización del sector del taxi en España

Flor García, María 21 February 2023 (has links)
El sector del transporte y la movilidad está experimentando profundas transformaciones debidas principalmente a la concienciación medioambiental, al aumento de la población de las grandes áreas urbanas y al tamaño de las ciudades, al envejecimiento de la población y la aparición de relevantes innovaciones tecnológicas que han cambiado los hábitos de consumo, como el comercio electrónico o la economía colaborativa. Así, el auge de aplicaciones móviles como Uber y Cabify están transformando la movilidad urbana y metropolitana que debe adaptarse a este nuevo escenario y al propio concepto de movilidad. Estas aplicaciones ofrecen una alternativa a las prestaciones que tradicionalmente ha brindado el sector del taxi y el alquiler de vehículos con conductor (VTC), y se han desarrollado en un contexto de regulación de los mercados del taxi y VTC que contienen importantes restricciones no justificadas a la entrada y ejercicio de la actividad en el mercado, entre las que destaca el numerus clausus de licencias, el limitado ámbito geográfico de la licencia y, para el caso del taxi, los precios regulados en forma de tarifas públicas no flexibles. En este estudio, y aprovechando los últimos cambios legislativos que afectan sobre todo a la prestación de servicios de estas plataformas en España, se ha analizado cómo ha impactado su implantación en la seguridad vial de Madrid en dos periodos temporales diferenciados (2014-2018 y 2013-2019). En primer lugar, se ha analizado cómo ha afectado la entrada de estos servicios en la frecuencia de los accidentes -con al menos un herido grave o muerto-, diferenciando entre accidentes con presencia de alcohol o drogas y accidentes producidos en fin de semana y festivo. En segundo lugar, y teniendo en cuenta que por cada muerte en las carreteras europeas se producen unas cuatro lesiones que incapacitan de forma permanente, como daños en el cerebro o la médula espinal, ocho lesiones graves y cincuenta lesiones leves, se ha analizado el impacto de estos servicios en la gravedad del accidente, considerando el número de víctimas totales, heridos graves y muertos y heridos leves. Por último, y considerando que este tipo de servicios puede contribuir a una transferencia desde el vehículo particular a otros modos de transporte, fomentando la intermodalidad y cubriendo la "última milla" de los servicios de transporte más rígidos, dotando de mayor capilaridad y alcance a las redes troncales de transporte colectivo, se ha analizado si estos servicios complementan o sustituyen al transporte público para reducir la accidentalidad. Para ello, se ha realizado un análisis de regresión utilizando un modelo binomial negativa de efectos aleatorios (RENB). Se ha escogido el municipio de Madrid por razones relacionadas con la oferta de servicios y disponibilidad de datos suficientes para formular el modelo matemático. Los resultados muestran que desde la llegada de Uber y Cabify al municipio de Madrid los accidentes -con al menos un herido grave o muerto- y con presencia de alcohol o drogas se han reducido en torno al 98%. Del mismo modo, también se observa un descenso, de aproximadamente un 18%, en el número de accidentes -con al menos un herido grave o muerto- producidos en fin de semana y festivo. Respecto a la gravedad del accidente, los resultados obtenidos muestran una reducción en el número de heridos graves y muertos de entorno al 25%. Sin embargo, el número de víctimas totales y el número de heridos leves ha aumentado un 3% y un 5% respectivamente. Finalmente, se ha observado que el número de heridos graves y muertos ha disminuido tanto en la "Almendra Central" (30.5%) como en la periferia (54.9%) del municipio, siendo mayor el impacto de estas plataformas en los distritos periféricos -con menor presencia de transporte público-. Además, el número de accidentes (con al menos un herido grave o un muerto) en fin de semana y festivo ha disminuido en ambas zonas, siendo de nuevo el impacto más notable en las zonas periféricas con un 54.9% frente a un 49.7%. El número de heridos leves también han disminuido en los distritos periféricos de la ciudad un 24,6%. Sin embargo, el número de heridos leves ha aumentado un 5.7% en la "Almendra Central" donde el 73% de los desplazamientos se realizan en transporte público. En general, los resultados encontrados en este estudio apoyarían la hipótesis de que estos servicios sustituyen al transporte público, en especial a los autobuses urbanos. Sin embargo, estos servicios mejoran la oferta a los usuarios con mayores dificultades para acceder a los taxis o al transporte público, constituyendo un modo de transporte alternativo para los conductores de alto riesgo. Por lo tanto, estos hallazgos pueden ser muy útiles para que los responsables políticos definan mejor las políticas reguladoras de estos servicios.

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