Resource management for data streaming applications

This dissertation investigates novel middleware mechanisms for building streaming applications. Developing streaming applications is a challenging task because (i) they are continuous in nature; (ii) they require fusion of data coming from multiple sources to derive higher level information; (iii) they require efficient transport of data from/to distributed sources and sinks; (iv) they need access to heterogeneous resources spanning sensor networks and high performance computing; and (v) they are time critical in nature. My thesis is that an intuitive programming abstraction will make it easier to build dynamic, distributed, and ubiquitous data streaming applications. Moreover, such an abstraction will enable an efficient allocation of shared and heterogeneous computational resources thereby making it easier for domain experts to build these applications. In support of the thesis, I present a novel programming abstraction, called DFuse, that makes it easier to develop these applications. A domain expert only needs to specify the input and output connections to fusion channels, and the fusion functions. The subsystems developed in this dissertation take care of instantiating the application, allocating resources for the application (via the scheduling heuristic developed in this dissertation) and dynamically managing the resources (via the dynamic scheduling algorithm presented in this dissertation). Through extensive performance evaluation, I demonstrate that the resources are allocated efficiently to optimize the throughput and latency constraints of an application.Ph.D.Committee Chair: Ramachandran, Umakishore; Committee Member: Chervenak, Ann; Committee Member: Cooper, Brian; Committee Member: Liu, Ling; Committee Member: Schwan, Karste

Discrete Automation - Eyes of the City

Observing people’s presence in physical space and deciphering their behaviors have always been critical actions to designers, planners and anyone else who has an interest in exploring how cities work. It was 1961 when Jane Jacobs, in her seminal book “The Death and Life of Great American Cities”, coined a famous expression to convey this idea. According to Jacobs, “the natural proprietors” of a certain part of the metropolis – the people who live, work or spend a substantial amount of time there – become the “eyes on the street.” Their collective, distributed, decentralized gaze becomes the prerequisite to establishing “a marvelous order for maintaining the safety of the streets and the freedom of the city.” Almost half a century later, we find ourselves at the inception of a new chapter in the relationship between the city and digital technologies, which calls for a reexamination of the old “eyes on the street” idea. In the next few years, thanks to the most recent advances in Artificial Intelligence, deep learning and imaging, we are about to reach an unprecedented scenario, the most radical development in the evolution of the Internet-of-Things: architectural space is acquiring the full ability to “see.” Imagine that any room, street or shop in our city can recognize you, and autonomously respond to your presence. With Jacobs’s “eyes on the street,” it was people who looked at other people or the city and interpreted its mechanisms. In this new scenario, buildings and streets similarly acquire the ability to observe and react as urban life unfolds in front of them. After the “eyes on the street,” we are now entering the era of the “Eyes of the City.” What happens, then, to people and the urban landscape when the sensor-imbued city is able to gaze back? What we are currently facing is an “utopia or oblivion” crossroads, to say it with the words of one of the most notable thinkers of the past century, Richard Buckminster Fuller. We believe that one of the fundamental duties of architects and designers today is to grapple with this momentous shift, and engage people in the process. “Eyes of the City” aims to experiment with these emerging scenarios to better comprehend them, deconstructing the potential uses of new technologies in order to make them accessible to everyone and inspire people to form an opinion. Using critical design as a tool, the exhibition seeks to create experiences that will encourage people to get involved in defining the ways in which new technologies will shape their cities in years to come. For this reason, it recognizes in Shenzhen’s Futian high-speed railway station its natural home – a place where to reach a broad, diverse audience of intentional visitors and accidental passersby, and a space where, just like in most other liminal transportation hubs, the impact of an “Eyes of the City” scenario is likely going to be felt the most

Shared-Use Bus Priority Lanes On City Streets: Case Studies in Design and Management, MTI Report 11-10

This report examines the policies and strategies governing the design and, especially, operations of bus lanes in major congested urban centers. It focuses on bus lanes that operate in mixed traffic conditions; the study does not examine practices concerning bus priority lanes on urban highways or freeways. Four key questions addressed in the paper are: How do the many public agencies within any city region that share authority over different aspects of the bus lanes coordinate their work in designing, operating, and enforcing the lanes? What is the physical design of the lanes? What is the scope of the priority use granted to buses? When is bus priority in effect, and what other users may share the lanes during these times? How are the lanes enforced? To answer these questions, the study developed detailed cases on the bus lane development and management strategies in seven cities that currently have shared-use bus priority lanes: Los Angeles, London, New York City, Paris, San Francisco, Seoul, and Sydney. Through the case studies, the paper examines the range of practices in use, thus providing planners and decision makers with an awareness of the wide variety of design and operational options available to them. In addition, the report highlights innovative practices that contribute to bus lanes’ success, where the research findings make this possible, such as mechanisms for integrating or jointly managing bus lane planning and operations across agencies

The Effect of Urban Fortification on Public Space

This dissertation contributes to empirical studies on the spatial extent and intensity of urban fortification/security zones and their influence on urban public space. Urban public space has been based on creating open and safe environments for city dwellers. However, ultra-secure urban spaces have been found to filter citizens, restrict movement, and modify individual behavior. This first part of this study determines where security zones manifest themselves, quantify the fortification of the security zones, and measure the intensity of these spaces in three major U.S. cities. The second part of the study offers an explanation of how social and commercial activity is being affected by security zones