This thesis investigates the problem of resource management (memory and I/O) in open distributed implementations of the LINDA model. The principal focus of the research is to deal with the problem of memory exhaustion by implementing garbage-collection techniques at the kernel level of LINDA since explicit methods that rely on users or computational languages are not feasible. The problem of I/...

A number of e orts in heterogeneous computing involve the development of basic architecture independent communication primitives We present a new programming paradigm called ActorSpace which provides a new communication model based on destination patterns An actorspace is a computationally passive container of actors which acts as a context for matching patterns Patterns are matched against lis...

In recent years, WiFi fingerprint-based localization has received much attention due to its deployment practicability. In this work, we investigate the impact of different indoor environmental factors on the performance of WiFi-fingerprinting. We find that, WiFi-fingerprinting highly depends on the deployed indoor environment. In an open space, it is quite challenging to find spatially varying ...

We study Witten’s open string field theory in the presence of a constant B field. We construct the string field theory in the operator formalism and find that, compared to the ordinary theory with no B field, the vertices in the resulting theory has an additional factor. The factor makes the zero modes of strings noncommutative. This is in agreement with the results in the first-quantized formu...

planning robot trajectory is a complex task that plays a significant role in design and application of robots in task space. the problem is formulated as a trajectory optimization problem which is fundamentally a constrained nonlinear optimization problem. open-loop optimal control method is proposed as an approach for trajectory optimization of cable parallel manipulator for a given two-end-po...

On the conception of metaphysical possibility that I prefer, a metaphysical possibility is simply a coherent way for the world to be. That is a substantial view. There are conceptions of metaphysical possibility on which not every coherent way for the world to be counts as a metaphysical possibility. To illustrate this point, consider a conception of metaphysical possibility based on a simplifi...

There is widespread public support for open space provision and for efforts by government to limit sprawl. We demonstrate that open space policies should not be viewed as independent of—or necessarily compatible with—growth management goals. We examine the impacts of open space designation on the urban landscape in a spatial city model with two important and empirically-relevant features: (1) r...

Increased development results in the loss of forest, farm, range, and other open space lands that contribute to the quality of life of U.S. residents. I describe an economic rationale for growing public support for preserving local open space, based the growing scarcity of open space lands. I test the rationale empirically by correlating the prevalence of open space referenda in U.S. counties t...