SACHI

Jacob Eisenstein: Interactive Topic Visualization for Exploratory Text Analysis

Abstract:
Large text document collections are increasingly important in a variety of domains; examples of such collections include news articles, streaming social media, scientific research papers, and digitized literary documents. Existing methods for searching and exploring these collections focus on surface-level matches to user queries, ignoring higher-level thematic structure. Probabilistic topic models are a machine learning technique for finding themes that recur across a corpus, but there has been little work on how they can support end users in exploratory analysis. In this talk I will survey the topic modeling literature and describe our ongoing work on using topic models to support digital humanities research. In the second half of the talk, I will describe TopicViz, an interactive environment that combines traditional search and citation-graph exploration with a dust-and-magnet layout that links documents to the latent themes discovered by the topic model.
This work is in collaboration with:
Polo Chau, Jaegul Choo, Niki Kittur, Chang-Hyun Lee, Lauren Klein, Jarek Rossignac, Haesun Park, Eric P. Xing, and Tina Zhou

Bio:
Jacob Eisenstein is an Assistant Professor in the School of Interactive Computing at Georgia Tech. He works on statistical natural language processing, focusing on social media analysis, discourse, and latent variable models. Jacob was a Postdoctoral researcher at Carnegie Mellon and the University of Illinois. He completed his Ph.D. at MIT in 2008, winning the George M. Sprowls dissertation award.

Event details

  • When: 23rd July 2013 13:00 - 14:00
  • Where: Cole 1.33
  • Format: Seminar

Computing Reviews’ Notable Books and Articles 2012

ACM Computing Reviews has selected a recent survey paper written by Per Ola Kristensson and colleagues as one of the Notable Computing Books and Articles of 2012.

The list consists of nominations from Computing Reviews reviewers, Computing Reviews category editors, the editors in chief of journals covered by Computing Reviews, and others in the computing community.

The selected survey paper is entitled “Foundational Issues in Touch-Surface Stroke Gesture Design — An Integrative Review” and it was published by the journal Foundations and Trends in Human-Computer Interaction in 2012.

Gesture-based Natural User Interfaces

Research into personalised gestures for user interfaces carried out by Miguel Nacenta, Per Ola Kristensson and two of our recent MSc students, Yemliha Kamber and Yizhou Qiang featured in the University News last week. You can read more about their research in the MIT Technology Review, and Fast Company’s Co.DESIGN. Their results question whether pre-programmed gestures need the personal touch to make them more effective.

MIT Technology Review – Jakub Dostal

MIT Technology Review has written a comprehensive article about Jakub Dostal’s Diff Displays that track visual changes on unattended displays. Jakub presented the work two weeks ago at the 18th ACM International Conference on Intelligent User Interfaces in Santa Monica, California, USA. The Diff Displays project is part of Jakub’s PhD thesis on proximity-aware user interfaces. His PhD is supervised by Prof. Aaron Quigley and Dr Per Ola Kristensson.

SACHI Conference: Changing Perspectives at CHI 2013

CHI is the premier international conference on human computer interaction, and this year’s event is looking to be the most exciting yet for the St Andrews Computer Human Interaction (SACHI) research group in the School of Computer Science.

Seven members of SACHI will attend CHI in Paris this April to present three full papers, one note, one work in progress paper and five workshop papers. In addition members of SACHI are involved in organising two workshops and one special interest group meeting. Two academics in SACHI are Associate Chairs for respective sub-committees and two PhD students will be serving as student volunteers at the 2013 conference. A very busy time for all!

For more complete details on these papers, notes etc. please see http://sachi.cs.st-andrews.ac.uk/2013/02/sachi-changing-perspectives-at-chi-2013/

Please note that the school of Computer Sciience is going to be introducing a new Masters in HCI from September this year.

Event details

  • When: 27th April 2013 - 2nd May 2013
  • Format: Conference

SACHI Seminar: A neurodynamical model of luminance perception by Olivier Penacchio

SACHI seminar

Title: A neurodynamical model of luminance perception

Speaker: Olivier Penacchio, University of St Andrews

Abstract:
The perception of such simple visual features as black, greys and white may sound simple. However, the luminance we perceive, also called brightness, does not match the luminance as physically measured. Instead, the perceived intensity of an area is modulated by the luminance of surrounding areas. This phenomenon is known as brightness induction and provides a striking demonstration that visual perception cannot be considered a simple pixel-wise sampling of the environment.

The talk will start with an overview of the classical examples of brightness induction and a quick look at the different theories underlying this phenomenon. We will next introduce a neurodynamical model of brightness induction, recently published*. This model is based on the architecture of the primary visual cortex and successfully accounts for well-known psychophysical effects both in static and dynamic contexts. It suggests that a common simple mechanism may underlie different fundamental processes of visual perception such as saliency and brightness perception. Finally, we will briefly outline potential applications in the arena of computer vision and medical imaging.
* Penacchio O, Otazu X, Dempere-Marco L (2013) A Neurodynamical Model of Brightness Induction in V1. PLoS ONE 8(5): e64086. doi:10.1371/journal.pone.0064086

Event details

  • When: 11th June 2013 13:00 - 14:00
  • Where: Cole 1.33a
  • Format: Seminar

SACHI Seminar: Modeling and Analyzing development of scripts by Vinodh Rajan

SACHI Seminar

Title:

Modeling and Analyzing development of scripts

Speaker: Vinodh Rajan, University of St. Andrews

Abstract:
Human handwriting is a process that often generates variable output. Scripts generally begin with characters possessing consistent shape. But the effects of variations tend to accumulate and modify the scripts’ appearance over time. The talk will start with a brief overview of scripts and related concepts. Then the example of the Brahmic family of scripts will be addressed, and in particular the variations that led to their development.This will be followed by a general introduction to handwriting modeling methods along with techniques such as trajectory reconstruction, stroke segmentation and stroke modeling. There will further be a discussion of methods and techniques to model and analyze development of scripts, with prospective applications, and lastly there will be a demo of what was achieved so far.

Bio:
Vinodh Rajan is a PhD student based within the School of Computing, here at the University of St. Andrews. Read more about Vinodh here.

Event details

  • When: 28th May 2013 13:00 - 14:00
  • Where: Cole 1.33a
  • Format: Seminar

SACHI Seminar: The SUM framework by Kyle Montague

SACHI Seminar

Title:

The SUM framework: An Exploration of Shared User Models and Adaptive Interfaces to Improve Accessibility of Touchscreen Interactions

Speaker: Kyle Montague, University of Dundee

Abstract:
Touchscreens are ever-present in technologies today. The large featureless sensors are rapidly replacing the physical keys and buttons on a wide array of digital technologies, the most common is the mobile device. Gaining popularity across all demographics and endorsed for their superior interface soft design flexibility and rich gestural interactions, the touchscreen currently plays a pivotal role in digital technologies. However, just as touchscreens have enabled many to engage with digital technologies, its barriers to access are excluding many others with visual and motor impairments. Continue reading

Event details

  • When: 14th May 2013 13:00 - 14:00
  • Where: Cole 1.33a
  • Format: Seminar