• Publications
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TransitLabel: A Crowd-Sensing System for Automatic Labeling of Transit Stations Semantics
TLDR
We present TransitLabel, a crowd-sensing system for automatic enrichment of transit stations indoor floorplans with different semantics, which in turn are mined to infer their uniquely associated stations semantics. Expand
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SemSense: Automatic construction of semantic indoor floorplans
TLDR
We present SemSense: a crowdsourcing-based system for automatic enrichment of indoor floorplans with semantic labels. Expand
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FluidMeter: Gauging the Human Daily Fluid Intake Using Smartwatches
TLDR
We present FluidMeter: a ubiquitous and unobtrusive system to track the amount of fluid intake leveraging the inertial sensors embedded in smartwatches. Expand
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CheckInside: a fine-grained indoor location-based social network
TLDR
In this paper, we present CheckInside: a system that can provide a fine-grained indoor location-based social network. Expand
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The Tale of Two Localization Technologies: Enabling Accurate Low-Overhead WiFi-based Localization for Low-end Phones
WiFi fingerprinting is one of the mainstream technologies for indoor localization. However, it requires an initial calibration phase during which the fingerprint database is built manually by siteExpand
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A Fine-Grained Indoor Location-Based Social Network
TLDR
We present CheckInside: a system that can provide a fine-grained indoor location-based social network. Expand
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Activity recognition of railway passengers by fusion of low-power sensors in mobile phones
TLDR
We present PassActiv, a mobile sensing system that leverages the ubiquitous sensors available in commodity cell-phones to automatically recognize railway passengers' activities. Expand
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HyRise: A Robust and Ubiquitous Multi-Sensor Fusion-based Floor Localization System
TLDR
In this paper, we present HyRise: a robust and ubiquitous probabilistic crowdsourcing-based floor determination system that combines the barometer sensor and the ubiquitous Wi-Fi access points installed in the building to identify the user's floor. Expand
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Towards ubiquitous indoor spatial awareness on a worldwide scale
TLDR
A truly ubiquitous indoor spatial awareness system is envisioned to be deployed on a large scale worldwide, with minimum overhead, and to work with the heterogeneous IoT devices. Expand
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CrowdMeter: Congestion Level Estimation in Railway Stations Using Smartphones
TLDR
We present CrowdMeter: a participatory system that leverages the sensed data collected from users' phones during their daily train commutes to gauge the real-time congestion level in railway stations. Expand
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