Digital Commons Network^™

Intermittently Connected Delay-Tolerant Wireless Sensor Networks, Ying Li

Doctoral Dissertations

Intermittently Connected Delay-Tolerant Wireless Sensor Networks (ICDT-WSNs), a branch of Wireless Sensor Networks (WSNs), have features of WSNs and the intermittent connectivity of Opportunistic Networks. The applications of ICDT-WSNs are increasing in recent years; however, the communication protocols suitable for this category of networks often fall short. Most of the existing communication protocols are designed for either WSNs or Opportunistic Networks with sufficient resources and tend to be inadequate for direct use in ICDT-WSNs.

In this dissertation, we study ICDT-WSNs from the perspective of the characteristics, chal- lenges and possible solutions. A high-level overview of ICDT-WSNs is given, followed by …

Hydrographic Data Processing On A Robust, Network-Coupled Parallel Cluster, Rohit Venugopal

Master's Theses and Capstones

There have been tremendous advances in acoustic sensor technologies and widespread adoption of multibeam echo-sounders in the recent past, which have enabled the efficient collection of large quantities of bathymetric data in every survey. However, timely dissemination of this data to the scientific community has been constrained by the relatively slow progress in the development of new data processing architectures. The current solutions for powerful, efficient and near-real time data processing systems entail high capital investments and technical complexities. Therefore, the installation base for these systems has been very small. The work presented here proposes a new architecture for bathymetric …

Inferring Types To Eliminate Ownership Checks In An Intentional Javascript Compiler, Chris Hebert

Master's Theses and Capstones

Concurrent programs are notoriously difficult to develop due to the non-deterministic nature of thread scheduling. It is desirable to have a programming language to make such development easier. Tscript comprises such a system. Tscript is an extension of JavaScript that provides multithreading support along with intent specification. These intents allow a programmer to specify how parts of the program interact in a multithreaded context. However, enforcing intents requires run-time memory checks which can be inefficient. This thesis implements an optimization in the Tscript compiler that seeks to improve this inefficiency through static analysis. Our approach utilizes both type inference and …

Mobile Video Delivery With Minimal Bitrate Changes, Mario Atallah

Master's Theses and Capstones

Mobile data traffic keeps increasing year after year, as does the need for devices and technologies that support that growth. Video streaming, in particular, has been the major concern for mobile data traffic due to the complexity in handling the bulky nature of the data. HTTP has become the main medium for video streaming over mobile devices due to its existing popularity. When streaming video to multiple clients on the same network, a bandwidth allocation manager is required to efficiently distribute the available bandwidth among the clients and to ensure a high Quality of Experience (QoE). At the same time, …