The lower overhead associated with one-sided messaging as compared to traditional two-sided communication has the potential to increase the performance at scale of scientific applications by increasing the effective network bandwidth and reducing synchronization overheads. In this work, we investigate both the programming effort required to modify existing MPI applications to exploit one-sided ...

Numerous threats have been identified when using social networks. The question is whether young people are aware of these negative impacts of online and mobile technologies. Will they identify threats when needed? Will they know where to get help? Students and school children were part of a survey where their behavior and use of Facebook and an instant messaging application MXit were studied. T...

Text messaging is the most widely used form of computermediated communication (CMC). Previous findings have shown that linguistic factors can reliably indicate messages as deceptive. For example, users take longer and use more words to craft deceptive messages than they do truthful messages. Existing research has also examined how factors, such as student status and gender, affect rates of dece...

Multicast is an efficient method to deliver data to a large number of receivers. In this paper, we revisit the topic of distributed and optimal rate allocation in application layer multicast. First, we propose a fully distributed network model based on our observation and assumptions, and form an optimization problem to maximize the aggregate utilities of all receivers. Second, we propose a nov...

We report on a two-week deployment of a peer-to-peer, mobile, location-enhanced messaging service. This study is specifically aimed at investigating the need for and effectiveness of automatic location disclosure mechanisms, the emerging strategies to achieve plausible deniability, and at understanding how place and activity are used to communicate plans, intentions and provide awareness. We ou...

The investigation evaluated the impact of incorporating mobile technology and in particular the introduction of on-demand Short Messaging Service (SMS) – also known as text messaging into the information exchange between universities and the students. The impact of the technology on the creation of a new mode of information exchange that augments the existing student learning experience was ass...

As enterprise applications rely increasingly on commodity messaging middleware, message tracking has become instrumental in testing and run-time monitoring. However, building an effective message tracking system is challenging because of the large scale and high message rate of enterprise-wide applications. To address this challenge, we consider the case of message tracking for distributed mess...

The privacy-related Snapchat smartphone application allows users to share time-limited photos or videos, which “disappear” after a specified number of seconds once opened. This paper describes the results of a user survey designed to help us understand how and why people use the Snapchat application. We surveyed 127 adult Snapchat users, finding that security is not a major concern for the majo...

Emerging application domains such as interactive vision, animation, and multimedia collaboration display dynamic scalable parallelism, and high computational requirements, making them good candidates for executing on parallel architectures such as SMPs and clusters of SMPs. The necessity to reason about program behavior along the time dimension is an important characteristic of these types of a...