31 research outputs found
On-demand diensten onderzoeken met agent-based model
No full textBinnen het concept van Mobility-as-a-Service nemen de ‘vervoersdiensten op aanvraag’, vervoer wanneer en hoe we het willen, een belangrijke plek in. Wat is het potentieel van deze diensten? En als ze eenmaal geïmplementeerd zijn, wat betekent dat dan voor de prestatie van het vervoerssysteem als geheel? PhD’er Jishnu Naraya van TU Delft deed hier onderzoek naar – en toonde en passant aan hoe nuttig agent-based modellen zijn.Transport and PlanningTransport and Plannin
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Susham Bedi: A Literary Life
No full textThe Hindi Urdu Flagship’s Jishnu Shankar sits down with well-known Hindi writer and actress Susham Bedi to discuss her journey into a life of Hindi letters. Bedi describes her childhood and adolescence in India, her acting career, and some sources of inspiration for her most famous stories. The interview is wonderful listening comprehension practice for intermediate Hindi students and a fascinating insight in to the life of a Hindi writer. Bedi is the author of a number of well-known Hindi novels and short-stories. Two of these novels, Havan andVapasi, were also translated into Urdu and published in Pakistan. Bedi has also been involved in Hindi language pedagogy for more than a decade. She teaches at Columbia University and has developed a number of widely used Hindi comprehension materials. In addition to her work with Hindi language and literature, Bedi has had a highly successful career as a stage and screen actress. She featured in many well-known Hindi theater productions during the 1960s and 70s; more recently, she has appeared in a number of American television shows (True Crime, Third Watch, Law & Order: SVU) and movies (The Guru, ABCD).Asian Studie
Topic mining and categorization in online discussion forums
No full textOnline Forums provide a useful way to engage in discussions about a wide variety of topics, as well as gather custom information for which an exact source may not be available, using a combination of knowledge and human interpretation. Usually forums have categories which cater to a particular topic of interest, allowing information seekers and topic experts to meet. It is thus imperative to organize forum data into an organized structure. In this work we look at methods for categorizing forum posts into appropriate categories, where the number of such categories is large. We compare several baseline methods with state-of-the-art deep learning methods and analyze their performance. We observe that given the highly keyword-centric nature of our data, deep learning methods only slightly outperform baseline methods. Following this, we perform topic modeling on the forum data to find latent topics which creates a hierarchy across forum categories and clusters similar categories. In this process we observe that some of the recent approaches in topic modeling that utilize word embeddings lead to better topics. Finally, we use this hierarchy to perform hierarchical classification of the forum posts to allow better management of the classification task and analyze the benefits of this method.Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2022-05-01The student, Jishnu Dey, accepted the attached license on 2020-05-12 at 13:28.The student, Jishnu Dey, submitted this Thesis for approval on 2020-05-12 at 13:30.This Thesis was approved for publication on 2020-05-12 at 14:23.DSpace SAF Submission Ingestion Package generated from Vireo submission #15355 on 2020-08-25 at 17:44:24Made available in DSpace on 2020-08-27T00:51:33Z (GMT). No. of bitstreams: 2
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Equity in educational expenditures : can government subsidies help?
No full textWhen there are externalities across households, governments can improve economic outcomes by equitably subsidizing education. But this chain of causality works only if (1) allocated resources reach the final recipients, and (2) equity in public subsidies translates directly into equity in total educational expenditures, including private spending at the household level. Using a unique data set fromZambia, the author shows that whether these conditions are met depends on the specific schemes used to allocate resources as well as the exact form of the subsidies. First, subsidies allocated through clear guidelines and legislated rules reached the final recipients, but those allocated at the discretion of province and educational offices did not. Second, even those components of subsidies that were progressive (in that the share of total subsidies for the poor was greater than the share for the non-poor) had no effect on inequality in total educational expenditures due to the crowding-out of household spending.Economic Theory&Research,Environmental Economics&Policies,Teaching and Learning,Decentralization,Payment Systems&Infrastructure,Teaching and Learning,Economic Adjustment and Lending,Health Economics&Finance,Economic Theory&Research,Environmental Economics&Policies
Design and Analysis of On-Demand Mobility Systems
No full textThe past decade has seen vast advancements in various ICT (Information Communication, and Technology) platforms. These advancements have enabled the rise of innovative mobility solutions e.g. on-demand transport services. Such solutions offer flexible transport services to users in which users can receive tailor-made mobility solutions. Increasing evidence from the literature points at the potentially disruptive effects of such innovative mobility solutions on urban mobility. The effects range from traditional modes such as privately owned cars and public transport losing their market share to on-demand services, to the subsequent need for public transport systems to evolve to stay relevant. Modelling tools for the design and assessment of such on-demand transport services therefore needs to account for its implications for urban mobility by considering its interaction with other travel modes. Existing studies that have looked into the design and analysis of on-demand services largely overlooked the impact of these services on other travel modes and vice-versa. The existing literature hence considered the design and analysis of on-demand systems without investigating this effect of on-demand services on other travel modes and their overall impact on urban mobility. This study attempts to fill this research gap by developing an approach to the design and analysis of on-demand services in an urban mobility context. Two types of on-demand services are considered in this thesis, namely private and pooled. Both private and pooled on-demand services are characterised by a fleet of vehicles controlled by a central dispatching unit. They provide door-to-door service to passengers’ travel requests in real time. While the private on-demand service provides taxi-like service to passengers, pooled on-demand service allows multiple passengers to share the service.TRAIL Thesis Series no. T2020/15, the Netherlands TRAIL Research SchoolTransport and Plannin
Microfluidic rectifier for polymer solutions flowing through porous media
No full textFluidic rectification refers to anisotropic flow resistance upon changing the flow direction. Polymeric solutions, in contrast to Newtonian fluids, can exhibit an anisotropic flow resistance in microfluidic devices by tuning the channel shape at low Reynolds number. Such a concept has not been investigated in an anisotropic porous medium. We have developed a fluidic rectifier based on an anisotropic porous medium consisting of a periodic array of triangular pillars that can operate at a low Reynolds number. Rectification is achieved, when the type of high Weissenberg number elastic instabilities changes with the flow direction. The flow resistance differs across the two directions of the anisotropic porous medium geometry. We have identified the type of elastic instabilities that appear in both forward and backward directions. Particularly, we found a qualitative relation between the dead-zone instability and the onset of fluidic rectification.Accepted Author ManuscriptChemE/Product and Process EngineeringReservoir Engineerin
Flight control simulator using optic-flow Hardware-in-the-loop
No full textThe most simplistic acts in nature can be incredibly complex to replicate. Among which, insects in general, are profound micro-machines with evolution as the backbone for their most optimized features. This study focuses on developing an efficient sensing and processing strategy for autonomous flight maneuvers in Atalanta, a bio-inspired robotic-fly that uses unconventional flapping wing propulsion for flights. Visual guidance has proven a very significant role in the fields of autonomous robot navigation. Optical-flow-based solutions provide map-less navigation strategies, especially for miniaturized robots that possess stringent size, weight, and processing (SWaP) constraints. The primary objective focuses on the evaluation of a compact optical mouse sensor (ADNS 9800) for use as an optical-flow sensor in autonomous robots for indoor applications. The sensor is programmed for optic-flow detection and enhanced with suitable optics to improve the existing focal range from 3 mm to a few meters. A customizable MATLAB GUI is developed to create a digital sensing environment for the sensor. After necessary modifications, the sensor has proven to be sensitive under 70% brightness and contrast in the digital optical-flow environment. Despite the limited resolution and field-of-view, the sensor is identified and proven to perform well as an optical-flow sensor. Combinations of these sensors are used to develop a Hardware-in-the-loop (HITL) flight simulator to understand pure optic-flow based controls-strategies. Results indicate that the flight simulator works as intended for indoor situations within an error tolerance in Optic-flow of 4.83% from the actual path.Atalanta projectMechanical Engineering | Precision and Microsystems Engineerin
Does ride-sourcing absorb the demand for car and public transport in Amsterdam?
No full textThe emergence of innovative mobility services, is changing the way people travel in urban areas. Such systems offer on-demand service (door-To-door or stop-To-stop, individual or shared) to passengers. In addition to providing flexible services to passengers, past studies suggested that such services could effectively absorb the demand for private cars thereby reducing network congestion and demand for parking. This study investigates the potential of a ride-sourcing service to absorb the demand for public transport and private cars for the city of Amsterdam. Results indicate that a ride-sourcing vehicle could potentially serve the demand currently served by nine privately owned vehicles and that a fleet size equivalent to 1.3% and 2.6% of the total public transport trips, are required to provide doorto-door and stop-To-stop times comparable to those yielded by the current public transport system. Results from the modal shift indicate that most PT trips are substituted by active modes and most car trips are substituted by ride-sourcing service.Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Transport and PlanningTransport and Plannin
Equity in Educational Expenditures : Can Government Subsidies Help?
No full textWhen there are externalities across households, governments can improve economic outcomes by equitably subsidizing education. But this chain of causality works only if (1) allocated resources reach the final recipients, and (2) equity in public subsidies translates directly into equity in total educational expenditures, including private spending at the household level. Using a unique data set from Zambia, the author shows that whether these conditions are met depends on the specific schemes used to allocate resources as well as the exact form of the subsidies. First, subsidies allocated through clear guidelines and legislated rules reached the final recipients, but those allocated at the discretion of province and educational offices did not. Second, even those components of subsidies that were progressive (in that the share of total subsidies for the poor was greater than the share for the non-poor) had no effect on inequality in total educational expenditures due to the crowding-out of household spending
On characteristic power series of dual signed Selmer groups
No full textWe relate the cardinality of the -primary part of the Bloch-Kato Selmer
group over attached to a modular form at a non-ordinary prime
to the constant term of the characteristic power series of the signed Selmer
groups over the cyclotomic -extension of . This
generalizes a result of Vigni and Longo in the ordinary case. In the case of
elliptic curves, such results follow from earlier works by Greenberg, Kim, the
second author, and Ahmed-Lim, covering both the ordinary and most of the
supersingular case.Comment: Accepted in Annales de l'Institut Fourie
