Research Projects

Buildings' Energy and Comfort Efficiency

Heating, ventilating, and air conditioning (HVAC) systems account for 51% of the total energy usage in buildings. The majority of these systems assume maximum room occupancy; all rooms are conditioned without regard to actual usage. Hence, effective energy management requires real-time occupancy measurement. We have developed SCOPES, a distributed Smart Camera Object Position Estimation System for measuring the movement of people in indoor environments. Also, we are working on models for predicting room occupancy using data gathered from these sensors. more

Wireless Link Modeling

Recent studies have indicated the presence of a wide chasm between the real world radio channel behavior and existing radio channel models in wireless simulators. This leads to significant differences in performance of a system in simulation as compared to a real world deployment. Our goal is model the structure at different temporal scales seen in packet reception traces. We propose a novel multilevel approach involving Hidden Markov Models (HMMs) and Mixtures of Multivariate Bernoullis (MMBs) for modeling the long and short time scale behavior of links in wireless sensor networks. We call our model, the Multi-level Markov model or simply, the M&M Model. more

Solar Radiation Mapping and Prediction

The lack of reliable data for ground solar irradiance (direct normal and global irradiance) is a major obstacle for the development of adequate policies to promote and take advantage of existing solar technologies. Although the radiation that reaches the outer layers of the atmosphere is well defined and can be easily calculated, the solar irradiance that reaches the ground level where solar collectors (thermal and photovoltaic) operate depends strongly on localized and complex atmospheric conditions. The goal of the project is to build and test an Affordable System for Solar Irradiance Sensing and Tracking (ASSIST). We propose a tiered-architecture where a small number of expensive and highly calibrated solar observatories get complemented by a larger number of inexpensive but uncalibrated ASSIST nodes. more

Wireless Link Quality Estimation, Prediction and Metrics

Link Estimation is an integral part of reliable communication in wireless networks. Recent studies have shown that link reliability-based metrics like ETX perform superior to the traditional metrics such as hop count and latency. The goal of this research is to provide extensive evaluation of three commonly used link quality estimation metrics, ETX, 4Bit and RNP namely, with insights on their performance under different criteria. more

Exercise Physiology Monitoring and Modeling

Running efficiency is an important factor to consider in order to avoid injury. In particular, foot pronation, the angle of the foot as it hits the ground, is a common cause for many types of injuries among runners. Though pronation is common, diagnosing pronation is difficult and imprecise. Currently there is no method of diagnosis which can quantify the severity of pronation. The goal of our study is to develop a system for measuring foot pronation using the WISP (Wireless Identification and Sensing Platform) sensor platform. more

SenSearch: People and Animal Tracking

SenSearch is a witness assisted lost object tracking project. It shows that smart system design decisions can enable the use of small ultra-low-power sensor nodes to track down people at a place where no other infra-structure can be deployed. more