Timothy Sohn

Publications39
h-index20
Citations3,911
Highly Influential Citations249
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Place Lab: Device Positioning Using Radio Beacons in the Wild
TLDR
Experimental results are presented showing that 802.11 and GSM beacons are sufficiently pervasive in the greater Seattle area to achieve 20-30 meter median accuracy with nearly 100% coverage measured by availability in people's daily lives. Expand
Practical Metropolitan-Scale Positioning for GSM Phones
TLDR
This paper examines the positioning accuracy of a GSM beacon-based location system in a metropolitan environment and shows that a small 60-hour calibration drive is sufficient for enabling a metropolitan area similar to Seattle. Expand
A diary study of mobile information needs
TLDR
This study conducted a two-week diary study to better understand mobile information needs and how they are addressed and revealed that depending on the time and resources available, as well as the situational context, people use diverse and, at times, ingenious ways to obtain needed information. Expand
iCAP: Interactive Prototyping of Context-Aware Applications
TLDR
iCAP is presented, a system that allows end-users to visually design a wide variety of context-aware applications, including those based on if-then rules, temporal and spatial relationships and environment personalization. Expand
Mobility Detection Using Everyday GSM Traces
TLDR
This paper explores how coarse-grained GSM data from mobile phones can be used to recognize high-level properties of user mobility, and daily step count, and demonstrates that even without knowledge of observed cell tower locations, mobility modes that are useful for several application domains are recognized. Expand
Place-Its: A Study of Location-Based Reminders on Mobile Phones
TLDR
Place-Its, a location-based reminder application that runs on mobile phones, is designed to study people using location-aware reminders throughout their daily lives and reveals that location- based reminders are useful, in large part because people use location in nuanced ways. Expand
A large scale study of text-messaging use
TLDR
Findings from a large scale text messaging study of 70 university students in the United States suggest that students communicate with a large number of contacts for extended periods of time, engage in simultaneous conversations with as many as 9 contacts, and often use text messaging as a method to switch between a variety of communication mediums. Expand
Social Disclosure of Place: From Location Technology to Communication Practices
TLDR
A social location disclosure service, Reno, designed for use on a common mobile phone platform is presented and the guiding principles that dictate parameters for creating a usable, useful and ubiquitous service are described. Expand
Usability and Feasibility of PmEB: A Mobile Phone Application for Monitoring Real Time Caloric Balance
TLDR
PmEB is both usable and feasible for self-monitoring in weight management, and the iterative pilot study methodology was effective in improving its usability. Expand
Control, Deception, and Communication: Evaluating the Deployment of a Location-Enhanced Messaging Service
TLDR
The results show a lack of value of automatic messaging functions, confirm the need for supporting plausible deniability in communications, and highlight the prominent use of activity instead of place to indicate one's location. Expand
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