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What drives the joint demand for ride-hailing and carsharing services? Understanding consumers’ behaviors, attitudes, & concerns
Get PDFWhat drives the joint demand for ride-hailing and carsharing services? Understanding consumers’ behaviors, attitudes, & concerns
No full textHarnessing Big Data for Characterizing Driving Volatility in Instantaneous Driving Decisions – Implications for Intelligent Transportation Systems
Get PDFThis dissertation focuses on combining connected vehicles data, naturalistic driving sensor and telematics data, and traditional transportation data to prospect opportunities for engineering smart and proactive transportation systems.The key idea behind the dissertation is to understand (and where possible reduce) “driving volatility” in instantaneous driving decisions and increase driving and locational stability. As a new measure of micro driving behaviors, the concept of “driving volatility” captures the extent of variations in driving, especially hard accelerations/braking, jerky maneuvers, and frequent switching between different driving regimes. The key motivation behind analyzing driving volatility is to help predict what drivers will do in the short term. Consequently, this dissertation develops a “volatility matrix” which takes a systems approach to operationalizing driving volatility at different levels, trip-based volatility, location-based volatility, event-based volatility, and driver-based volatility. At the trip-level, the dynamics of driving regimes extracted from Basic Safety Messages transmitted between connected vehicles are analyzed at a microscopic level, and where the interactions between microscopic driving decisions and ecosystem of mapped local traffic states in close proximity surrounding the host vehicle are characterized. Another new idea relates to extending driving volatility to specific network locations, termed as “location-based volatility”. A new methodology is proposed for combining emerging connected vehicles data with traditional transportation data (crash, traffic, road geometrics data, etc.) to identify roadway locations where traffic crashes are waiting to happen. The idea of event-based and driver-based volatility introduces the notion that volatility in longitudinal and lateral directions prior to involvement in safety critical events (crashes/near-crashes) can be a leading indicator of proactive safety.Overall, by studying driving volatility from different lenses, the dissertation contributes to the scientific analysis of real-world connected vehicles data, and to generate actionable knowledge relevant to the design of smart and intelligent transportation systems. The concept of driving volatility matrix provides a systems framework for characterizing the health of three fundamental elements of a transportation system: health of driver, environment, and the vehicle. The implications of the findings and potential applications to proactive network level screening, customized driver assist and control systems, driving performance monitoring are discussed in detail
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Geography of E-shopping: distinctions among grocery, prepared meals, and non-grocery products
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Urban form and cardiovascular health: Decoupling hierarchical heterogeneity in built environment impacts
Get PDFLongitudinal impacts of the built environment and transit accessibility on neighborhood-level cardiovascular disease (CVD) prevalence are not well explored. Further, little is known about the magnitude of heterogeneity in the longitudinal links between social and built environment features and CVD prevalence. This study utilized a longitudinal ecological study design covering 26,631 neighborhoods (census tracts) in the 500 largest American cities. A novel data infrastructure is harnessed by integrating time-varying neighborhood-level data on transportation, the built and social environments, and chronic disease prevalence at two time points. In a full Bayesian framework, Markov Chain Monte Carlo-based grouped correlated random parameter models are formulated to simultaneously account for unobserved and correlated heterogeneity impacts. More walkable neighborhoods, characterized by greater density, street connectivity, and land-use mix, had lower CVD and hypertension prevalence over time. Greater transit accessibility was also correlated with lower disease prevalence. Conversely, neighborhoods with higher social vulnerability had greater CVD and hypertension rates over time. A detailed post hoc neighborhood-level assessment revealed significant unobserved and correlated heterogeneity in the impacts of social and built environment features across both neighborhoods and cities. Insights into this heterogeneity, as well as the determinants of neighborhood-level CVD and hypertension prevalence, can help public health officials, engineers, and policymakers implement localized community-based behavioral interventions for smarter and healthier cities. Implications for national disease surveillance systems are discussed
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Get PDF“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Get PDFWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Mosque of Bahramiya
No full textAl-Bahramiyya Mosque, located in the Jallum district in midst of the main bazaar area, was built by Ottoman Governor (Wali) Behram Pasha in 1580. It is designed in the takiyya style and differs from the other Ottoman mosques in that the qibla wall is indented to form an iwan which forms the space for the mihrab.
Source:
Rihawi, Abdul Qader. 1979. Arabic Islamic Architecture in Syria. Damascus: Ministry of Culture and National Heritage, 231.exterior, seen from Chelebi House, 199
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