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Gerard Pons-Moll, Jonathan Taylor, Jamie Shotton, Aaron Hertzmann, and Andrew Fitzgibbon

We present a new method for inferring dense data to model correspondences, focusing on the application of human pose estimation from depth images. Recent work proposed the use of regression forests to quickly predict correspondences between depth pixels and points on a 3D human mesh model. That work, however, used a proxy forest training objective based on the classification of depth pixels to body parts. In contrast, we introduce Metric Space Information Gain (MSIG), a new decision forest training...

Publication details
Date: 1 August 2015
Type: Article
Publisher: Springer
Kuansan Wang

Human is the only species on earth that has mastered the technologies in writing and printing to capture ephemeral thoughts and scientific discoveries. The capabilities to pass along knowledge, not only geographically but also generationally, have formed the bedrock of our civilizations. We are in the midst of a silent revolution driven by the technological advancements: no longer are computers just a fixture of our physical world but have they been so deeply woven into our daily routines that they are...

Publication details
Date: 18 May 2015
Type: Inproceeding
Publisher: ACM – Association for Computing Machinery
Aditya Vashistha, Edward Cutrell, Gaetano Borriello, and William Thies

Interactive voice forums have emerged as a promising platform for people in developing regions to record and share audio messages using low-end mobile phones. However, one of the barriers to the scalability of voice forums is the process of screening and categorizing content, often done by a dedicated team of moderators. We present Sangeet Swara, a voice forum for songs and cultural content that relies on the community of callers to curate high-quality posts that are prioritized for playback to others....

Publication details
Date: 1 May 2015
Type: Inproceeding
Publisher: ACM – Association for Computing Machinery
Toby Sharp, Cem Keskin, Duncan Robertson, Jonathan Taylor, Jamie Shotton, David Kim, Christoph Rhemann, Ido Leichter, Alon Vinnikov, Yichen Wei, Daniel Freedman, Pushmeet Kohli, Eyal Krupka, Andrew Fitzgibbon, and Shahram Izadi

We present a new real-time hand tracking system based on a single depth camera. The system can accurately reconstruct complex hand poses across a variety of subjects. It also allows for robust tracking, rapidly recovering from any temporary failures. Most uniquely, our tracker is highly flexible, dramatically improving upon previous approaches which have focused on front-facing close-range scenarios. This flexibility opens up new possibilities for human-computer interaction with examples including...

Publication details
Date: 1 April 2015
Type: Inproceeding
Publisher: CHI
Awards: Best of CHI Honorable Mention Award
Michael Levit, Andreas Stolcke, Shuangyu Chang, and Sarangarajan Parthasarathy

We describe a method for interpolation of class-based n-gram language models. Our algorithm is an extension of the traditional EMbased approach that optimizes perplexity of the training set with respect to a collection of n-gram language models linearly combined in the probability space. However, unlike prior work, it naturally supports context-dependent interpolation for class-based LMs. In addition, the method works naturally with the recently introduced wordphrase-entity (WPE) language models that...

Publication details
Date: 1 April 2015
Type: Inproceeding
Publisher: IEEE – Institute of Electrical and Electronics Engineers
Saleema Amershi, Max Chickering, Steven M. Drucker, Bongshin Lee, Patrice Simard, and Jina Suh

Model building in machine learning is an iterative process. The performance analysis and debugging step typically involves a disruptive cognitive switch from model building to error analysis, discouraging an informed approach to model building. We present ModelTracker, an interactive visualization that subsumes information contained in numerous traditional summary statistics and graphs while displaying example-level performance and enabling direct error examination and debugging. Usage analysis from...

Publication details
Date: 1 April 2015
Type: Proceedings
Publisher: ACM – Association for Computing Machinery
Publication details
Date: 1 April 2015
Type: Article
Publisher: Now Publishers Inc.
Darren Edge, Sumit Gulwani, Natasa Milic-Frayling, Mohammad Raza, Reza Adhitya Saputra, Chao Wang, and Koji Yatani

Good alignment and repetition of objects across presentation slides can facilitate visual processing and contribute to audience understanding. However, creating and maintaining such consistency during slide design is difficult. In order to solve this problem, we present two complementary tools: (1) StyleSnap, which increases the alignment and repetition of objects by adaptively clustering object edge positions and allowing parallel editing of all objects snapped to the same spatial extent; and (2)...

Publication details
Date: 1 April 2015
Type: Inproceeding
Publisher: ACM – Association for Computing Machinery
TJ Tsai, Andreas Stolcke, and Malcolm Slaney

Addressee detection answers the question, “Are you talking to me?” When multiple users interact with a dialogue system, it is important to know when a user is speaking to the computer and when he or she is speaking to another person. We approach this problem from a multimodal perspective, using lexical, acoustic, visual, dialog state, and beam-forming information. Using data from a multiparty dialogue system, we demonstrate the benefit of using multiple modalities over using a single modality. We also...

Publication details
Date: 1 April 2015
Type: Inproceeding
Publisher: IEEE – Institute of Electrical and Electronics Engineers
Emanuel Zgraggen, Steven M. Drucker, Danyel Fisher, and Robert DeLine

Many different domains collect event sequence data and rely on finding and analyzing patterns within it to gain meaningful insights. Current systems that support such queries either provide limited expressiveness, hinder exploratory workflows or present interaction and visualization models which do not scale well to large and multi-faceted data sets. In this paper we present (sjqu)eries (pronounced “Squeries”), a visual query interface for creating queries on sequences (series) of data, based...

Publication details
Date: 1 April 2015
Type: Proceedings
Publisher: ACM – Association for Computing Machinery
Erin Brady, Meredith Ringel Morris, and Jeffrey P. Bigham

Crowd-powered systems that help people are difficult to scale and sustain because human labor is expensive and worker pools are difficult to grow. To address this problem we introduce the idea of social microvolunteering, a type of intermediated friendsourcing in which a person can provide access to their friends as potential workers for microtasks supporting causes that they care about. We explore this idea by creating Visual Answers, an exemplar social microvolunteering application for...

Publication details
Date: 1 April 2015
Type: Inproceeding
Publisher: ACM – Association for Computing Machinery
Elena L. Glassman, Juho Kim, Andrés Monroy-Hernández, and Meredith Ringel Morris

Educators have developed an effective technique to get feedback after in-person lectures, called “muddy cards.” Students are given time to reflect and write the “muddiest” (least clear) point on an index card, to hand in as they leave class. This practice of assigning end-of-lecture reflection tasks to generate explicit student feedback is well suited for adaptation to the challenge of supporting feedback in online video lectures. We describe the design and evaluation of Mudslide, a prototype system...

Publication details
Date: 1 April 2015
Type: Inproceeding
Publisher: ACM – Association for Computing Machinery
Juho Kim, Elena L. Glassman, Andrés Monroy-Hernández, and Meredith Ringel Morris

Teachers in conventional classrooms often ask learners to express themselves and show their thought processes by speaking out loud, drawing on a whiteboard, or even using physical objects. Despite the pedagogical value of such activities, interactive exercises available in most online learning platforms are constrained to multiple-choice and short answer questions. We introduce RIMES, a system for easily authoring, recording, and reviewing interactive multimedia exercises embedded in lecture videos....

Publication details
Date: 1 April 2015
Type: Inproceeding
Publisher: ACM – Association for Computing Machinery
Asli Celikyilmaz and Dilek Hakkani-Tur

While ensemble models have proven useful for sequence learning tasks there is relatively fewer work that provide insights into what makes them powerful. In this paper, we investigate the empirical behavior of the ensemble approaches on sequence modeling, specifically for the semantic tagging task. We explore this by comparing the performance of commonly used and easy to implement ensemble methods such as majority voting, linear combination and stacking to a learning based and rather complex ensemble...

Publication details
Date: 1 April 2015
Type: Inproceeding
Publisher: IEEE – Institute of Electrical and Electronics Engineers
Indrani Medhi Thies, Pedro Ferreira, Nakull Gupta, Jacki O’Neill, and Edward Cutrell

With the wide penetration of mobile internet, social networking (SN) systems are becoming increasingly popular in the developing world. However, most SN sites are text heavy, and are therefore unusable by low-literate populations. Here we ask what would an SN application for low-literate users look like and how would it be used? We designed and deployed KrishiPustak, an audio-visual SN mobile application for low-literate farming populations in rural India. Over a four month deployment, 306...

Publication details
Date: 1 March 2015
Type: Inproceeding
Publisher: ACM Conference on Computer-Supported Cooperative Work
Kathryn Zyskowski, Meredith Ringel Morris, Jeffrey P. Bigham, Mary L. Gray, and Shaun Kane

We present the first formal study of crowdworkers who have disabilities via in-depth open-ended interviews of 17 people (disabled crowdworkers and job coaches for people with disabilities) and a survey of 631 adults with disabilities. Our findings establish that people with a variety of disabilities currently participate in the crowd labor marketplace, despite challenges such as crowdsourcing workflow designs that inadvertently prohibit participation by, and may negatively affect the worker reputations...

Publication details
Date: 1 March 2015
Type: Inproceeding
Publisher: ACM – Association for Computing Machinery
Siân Lindley

This paper draws on research on time and technology, with a view to examining the notion that technology is implicated in the speeding up of everyday life. We begin by looking at research that shows how the adoption of the clock and of ‘clock time’ was framed by more general shifts in ways of conceptualising and using time. Likewise, we suggest that the ways in which digital technologies are said to shape experiences of time need to be understood in the context of the fractured routines of the modern...

Publication details
Date: 1 March 2015
Type: Inproceeding
Publisher: ACM – Association for Computing Machinery
Saiph Savage and Andres Monroy-Hernandez

Armed groups of civilians known as “self-defense forces” have ousted the powerful Knights Templar drug cartel from several towns in Michoacán, México. This militia uprising has unfolded on social media, particularly in the “VXM” (“Valor por Michoacán,” Spanish for “Courage for Michoacán”) Facebook page, gathering more than 170,000 fans. Previous work on the Drug War has documented the use of social media for real-time reports of violent clashes. However, VXM goes one step further by taking on a...

Publication details
Date: 1 March 2015
Type: Proceedings
Publisher: ACM – Association for Computing Machinery
Indrani Medhi-Thies, Pedro Ferreira, Nakull Gupta, Jacki O’Neill, and Edward Cutrell

With the wide penetration of mobile internet, social networking (SN) systems are becoming increasingly popular in the developing world. However, most SN sites are text heavy, and are therefore unusable by low-literate populations. Here we ask what would an SN application for low-literate users look like and how would it be used? We designed and deployed KrishiPustak, an audio-visual SN mobile application for low-literate farming populations in rural India. Over a four month deployment, 306...

Publication details
Date: 1 March 2015
Type: Proceedings
Publisher: ACM – Association for Computing Machinery
Gloria Mark, shamsi iqbal, mary czerwinski, and paul johns

While distractions using digital media have received

attention in HCI, understanding engagement in workplace

activities has been little explored. We logged digital activity

and continually probed perspectives of 32 information

workers for five days in situ to understand how attentional

states change with context. We present a framework of how

engagement and challenge in work relate to focus, boredom,

and rote work. Overall, we find more focused...

Publication details
Date: 1 March 2015
Type: Proceedings
Publisher: Proceedings of ACM CSCW 2014
Chuang R., Hall B.A., Benque D., Cook B., Ishtiaq S., Piterman N., Taylor A., Vardi M., Koschmieder S., Gottgens B., and Fisher J.

Chronic Myeloid Leukemia (CML) represents a paradigm for the wider cancer field. Despite the fact that tyrosine kinase inhibitors have established targeted molecular therapy in CML, patients often face the risk of developing drug resistance, caused by mutations and/or activation of alternative cellular pathways. To optimize drug development, one needs to systematically test all possible combinations of drug targets within the genetic network that regulates the disease. The BioModelAnalyzer (BMA) is a...

Publication details
Date: 1 February 2015
Type: Article
Publisher: Nature Publishing Group
Darren Edge, Sumit Gulwani, Natasa Milic-Frayling, Mohammad Raza, Reza Adhitya Saputra, Chao Wang, and Koji Yatani

Good alignment and repetition of objects across presentation slides can facilitate visual processing and contribute to audience understanding. However, creating and maintaining such consistency during slide design is difficult. In order to solve this problem, we present two complementary tools: (1) StyleSnap, which increases the alignment and repetition of objects by adaptively clustering object edge positions and allowing parallel editing of all objects snapped to the same spatial extent; and (2)...

Publication details
Date: 1 February 2015
Type: Inproceeding
Publisher: ACM – Association for Computing Machinery
Jason D. Williams, Nobal B. Niraula, Pradeep Dasigi, Aparna Lakshmiratan, Carlos Garcia Jurado Suarez, Mouni Reddy, and Geoff Zweig

In personal assistant dialog systems, intent models are classifiers that identify the intent of a user utterance, such as to add a meeting to a calendar, or get the director of a stated movie. Rapidly adding intents is one of the main bottlenecks to scaling — adding functionality to — personal assistants. In this paper we show how interactive learning can be applied to the creation of statistical intent models. Interactive learning [10] combines model definition, labeling, model...

Publication details
Date: 11 January 2015
Type: Inproceeding
Sang-won Leigh, Asta Roseway, and Ann Paradiso

Remnance of Form is an interactive installation that explores the dynamic tension between an object and its Shadow. By fusing light, projection, and motion technologies, the shadow can now detach itself from its former role. This creates a new narrative that challenges our perception of reality, what’s real and what’s not.


Publication details
Date: 1 January 2015
Type: Inproceeding
Publisher: ACM – Association for Computing Machinery
Robert A Cochran, Loris D’Antoni, Benjamin Livshits, David Molnar, and Margus Veanes

In this paper, we investigate an approach to program synthesis that is based on crowd-sourcing. With the help of crowd-sourcing, we aim to capture the “wisdom of the crowds” to find good if not perfect solutions to inherently tricky programming tasks, which elude even expert developers and lack an easy-to-formalize specification.

We propose an approach we call program boosting, which involves crowd-sourcing imperfect solutions to a difficult programming problem from developers and then...

Publication details
Date: 1 January 2015
Type: Proceedings
Publisher: ACM – Association for Computing Machinery
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