Error tolerant backbone resonance assignment is the cornerstone of the NMR structure determination process. Although a variety of assignment approaches have been developed, none works well on noisy automatically picked peaks. We have designed an integer linear programming (ILP) based assignment system (IPASS) for this purpose. In order to reduce size of the problem, IPASS employs probabilistic ...

In this paper, we define and formulate various policies for load management in distributed video servers. We propose a predictive placement policy that determines the degree of replication necessary for popular videos using a cost-based optimization procedure based on a priori predictions of expected subscriber requests. For scheduling requests, we propose an adaptive scheduling policy that com...

Blanton, Marina V. Ph.D., Purdue University, August, 2007. Key Management in Hierarchical Access Control Systems. Major Professor: Mikhail J. Atallah. In a hierarchical access control system, users are partitioned into a number of classes – called security classes – which are organized in a hierarchy. Hierarchies arise in systems where some users have higher privileges than others and a securit...

This paper reports on experiments and experiences with implementations of collaborative client/server archi-tectures, a software project that involved all students in the class. Nominally, the major goal of the special topics graduate class was to explore the Frontiers of collaborative computing on the Internet. The class brought together a team of seven students, each with some programming exp...

This paper considers policies for distributing requests in clustered Web servers, wherein multiple server machines are configured to function as a single high(er) performance Web server. We evaluate various load distribution policies with respect to both their ability to achieve good load balance (the primary goal) and also to their impact on the effectiveness of per-machine caching. Trace-driv...

The reciprocal virtue of peer-to-peer networking has stimulated an explosion of peer population and service capacity, ensuring rapid content distribution in peer-to-peer networks. Critical issues such as peer churn, free riding, and skewed workload significantly affect performance results such as service agility, fairness, and resource utilization. To resolve these problems systematically, this...

A centralized scheduler must assign tasks to servers, processing on-line a sequence of task arrivals and departures. Each task runs for an unknown length of time, but comes with a weight that measures resource utilization per unit time. The response time of a server is the sum of the weights of the tasks assigned to it. The goal is to minimize the maximum response time, i.e., load, of any serve...

This paper considers policies for distributing requests in clustered Web servers, wherein multiple server machines are conngured to function as a single high(er) performance Web server. We evaluate various load distribution policies with respect to both their ability to achieve good load balance (the primary goal) and also to their impact on the eeec-tiveness of per-machine caching. Trace-drive...

Today distributed server systems have been widely used in many areas because they enhance the computing power while being cost-effective and more efficient. Meanwhile, some novel scheduling strategies are employed to optimize the task assignment process. This project closely explored the performance of the novel scheduling strategies through computer simulation. The research was carried out reg...

Error tolerant backbone resonance assignment is the cornerstone of the NMR structure determination process. Although a variety of assignment approaches have been developed, none works sufficiently well on noisy fully automatically picked peaks to enable the subsequent automatic structure determination steps. We have designed an integer linear programming (ILP) based assignment system (IPASS) th...