MS Defense

Privacy Preservation in Context-Aware Systems

Pramod Jagtap

1:00pm Wednesday, 27 April 2011, ITE 210

Recent years have seen a confluence of two major trends – the increase of mobile devices such as smart phones as the primary access point to networked information and the rise of social media platforms that connect people. Their convergence supports the emergence of a new class of context-aware geosocial networking applications. While existing systems focus mostly on location, our work centers on models for representing and reasoning about a more inclusive and higher-level notion of context, including the user’s location and surroundings, the presence of other people and devices, feeds from social networking systems they use, and the inferred activities in which they are engaged. A key element of our work is the use of collaborative information sharing where devices share and integrate knowledge about their context. This introduces the need for privacy and security mechanisms. We present a framework to provide users with appropriate levels of privacy to protect the personal information their mobile devices are collecting including the inferences that can be drawn from the information. We use Semantic Web technologies to specify high-level, declarative policies that describe user’s information sharing preferences. We have built a prototype system that aggregates information from a variety of sensors on the phone, online sources, and sources internal to the campus intranet, and infers the dynamic user context. We show how our policy framework can be effectively used to devise better privacy control mechanisms to control information flow between users in such dynamic mobile systems.

Presentation

Thesis Committee:

• Dr. Anupam Joshi (chair)
• Dr. Tim Finin
• Dr. Yelena Yesha
• Dr. Laura Zavala

MS Defense

A Framework for GPU 3D Model Reconstruction
Using Structure-from-Motion

Yu Wang

10:00am Thursday, 28 April 2011, ITE 352

A framework for three-dimensional (3D) model reconstruction is described in this thesis. The primary application is scanning forest canopies and assisting scientific applications such as fire hazard evaluation and vegetation biomass estimation, using photos taken from a radio-controlled helicopter, although the methods apply to any series of photographs taken along a path. The approach is based on the fact that the photos are taken in a continuous path, thus taking advantage of the adjacency between images. The major contributions of this project are 1) introduce a linear time complexity algorithm that reduces number of image pairs to match for datasets obtained in a continuous path. 2) present an optimized high performance framework for GPU 3D reconstruction using structure-from-motion.

Thesis Committee:

• Dr. Marc Olano, Chair
• Dr. Penny Rheingans
• Dr. Erle Ellis

The Rev. Leo Patalinghug ’92, political science, has taken his passion for cooking to the next level, with the publication of a cookbook inspired by his family and his faith. His book, “Grace Before Meals, Recipes and Inspiration for Family Meals and Family Life,” outlines philosophies he teaches both in church and on his online cooking show, “Grace Before Meals.”

Read more about the cookbook here.

UMBC Magazine featured Patalinghug in its Winter 2010 edition. Read the full article here.

In addition to running his cooking show, Patalinghug teaches future priests at Mount St. Mary’s Seminary. Last year, he appeared on the Food Network’s “Throwdown with Bobby Flay,” on which the reverend bested the celebrity host with a fajita recipe inspired by Asian flavors.

MS Thesis Defense

eXtensible Dynamic Form (XDF) for Supplier Discovery

Yan Kang

1:00PM Tuesday, 26 April 2011, ITE 346

Discovery of suppliers (supplier discovery) is essential for building a flexible network of suppliers in a supply chain. The first step for supplier discovery is to collect manufacturing capabilities of suppliers and requirements of customers. In traditional e-marketplaces, online form interfaces are typically used to collect the requirements and capabilities. However, those forms are mostly lack of flexibility to capture a variety of requirements and capabilities in a structured way. In this thesis, we propose new innovative form architecture called eXtensible Dynamic Form (XDF) to facilitate data collection process of supplier discovery.

This architecture provides several key innovations including: 1) architecture for users (suppliers or customers) to create new structure of form for their own contents; 2) an intelligent search engine facilitating users to reuse the existing form components 3) hierarchical representation of the requirements and capabilities as XML instances. Experimental results demonstrate that the proposed architecture is valuable for facilitating the supplier discovery process.

Thesis Committee:

• Dr. Charles Nicholas
• Dr. Yun Peng (Chair)
• Dr. Yelena Yesha

photojojo:

The 50 Things Every Graphic Design Student Should Know

This roundup put together by British Designer Jamie Wieck is a great list of advice for photographers to read through, too!

MS Thesis Defense

Recovering from Soft Node Failures in
Wireless Sensor Networks using Neural Networks

Shivvasangari Subramani

9:00am Tuesday, 26 April 2011, ITE 346

In the past few years, wireless sensor networks (WSNs) have become important in different applications because of their robustness in hostile environments. WSNs need to perform in a timely manner in the face of interference, attacks, accidents, and failures. Being a battery operated system, there is a trade-off between performance and energy utilization. In this thesis we focus on WSN accuracy and consider ways to improve the performance of WSNs when sensors become damaged, resulting in poor input signal quality. When all other components of the sensor like the processor, memory, and battery are working, our proposed solution is to learn to undo the damage in a node by training on neighbors sensor values.

Thesis Committee:

• Dr. Anupam Joshi
• Dr. Tim Oates (chair)
• Dr. Mohamed Younis

The Rev. Leo Patalinghug ’92, political science, has taken his passion for cooking to the next level, with the publication of a cookbook inspired by his family and his faith. His book, “Grace Before Meals, Recipes and Inspiration for Family Meals and Family Life,” outlines philosophies he teaches both in church and on his online cooking show, “Grace Before Meals.”

Read more about the cookbook here.

UMBC Magazine featured Patalinghug in its Winter 2010 edition. Read the full article here.

In addition to running his cooking show, Patalinghug teaches future priests at Mount St. Mary’s Seminary. Last year, he appeared on the Food Network’s “Throwdown with Bobby Flay,” on which the reverend bested the celebrity host with a fajita recipe inspired by Asian flavors.