Wei Wang

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Human action recognition based on the depth information provided by commodity depth sensors is an important yet challenging task. The noisy depth maps, different lengths of action sequences, and free styles in performing actions, may cause large intra-class variations. In this paper, a new framework based on sparse coding and temporal pyramid matching (TPM)(More)
—A situational awareness system is essential to provide accurate understanding of power system dynamics, such that proper actions can be taken in real time in response to system disturbances and to avoid cascading blackouts. Event analysis has been an important component in any situational awareness system. However, most state-of-the-art techniques can only(More)
The ChemCam instrument package on the Mars rover, " Curiosity " , is the first planetary instrument that employs laser-induced breakdown spectroscopy (LIBS) to determine the compositions of geological samples on another planet. However , the sampled spectra are imperfect for elemental concentration estimation because of the inevitable sampling noises, the(More)
ii This dissertation is dedicated to my loving wife Ruoning and my cute son Isaac Li (李溪根). iii Acknowledgements I would like to thank all the individuals who have inspired, encouraged, and advised me in the preparation of this dissertation. First and foremost, I would like to thank my advisor, Dr. Hairong Qi. Her willingness to support my work and her(More)
Excess amounts of heavy metals are important environmental pollutants with significant ecological and nutritional effects. Cdmium (Cd) is of particular concern because of its widespread occurrence and high toxicity. We conducted physiological and proteomic analyses to improve our understanding of the responses of Populus yunnanensis to Cd stress. The(More)
Traditional hyperspectral anomaly detection methods either model the global background or the local neighborhood, that bring some apparent drawbacks, such as the unreasonable assumption of uni-modular background in global detectors, or the high false alarms by sliding windows in local detectors. In this paper, a source component-based anomaly detection(More)