@article{gantt_meskhidze_zhang_xu_2010, title={The effect of marine isoprene emissions on secondary organic aerosol and ozone formation in the coastal United States}, volume={44}, DOI={10.1016/j.atmosenv.2009.08.027}, abstractNote={The impact of marine isoprene emissions on summertime surface concentrations of isoprene, secondary organic aerosols (SOA), and ozone (O3) in the coastal areas of the continental United States is studied using the U.S. Environmental Protection Agency regional-scale Community Multiscale Air Quality (CMAQ) modeling system. Marine isoprene emission rates are based on the following five parameters: laboratory measurements of isoprene production from phytoplankton under a range of light conditions, remotely-sensed chlorophyll-a concentration ([Chl–a]), incoming solar radiation, surface wind speed, and sea-water optical properties. Model simulations show that marine isoprene emissions are sensitive to meteorology and ocean ecosystem productivity, with the highest rates simulated over the Gulf of Mexico. Simulated offshore surface layer marine isoprene concentration is less than 10 ppt and significantly dwarfed by terrestrial emissions over the continental United States. With the isoprene reactions included in this study, the average contribution of marine isoprene to SOA and O3 concentrations is predicted to be small, up to 0.004 μg m−3 for SOA and 0.2 ppb for O3 in coastal urban areas. The light-sensitivity of isoprene production from phytoplankton results in a midday maximum for marine isoprene emissions and a corresponding daytime increase in isoprene and O3 concentrations in coastal locations. The potential impact of the daily variability in [Chl-a] on O3 and SOA concentrations is simulated in a sensitivity study with [Chl-a] increased and decreased by a factor of five. Our results indicate that marine emissions of isoprene cause minor changes to coastal SOA and O3 concentrations. Comparison of model simulations with few available measurements shows that the model underestimates marine boundary layer isoprene concentration. This underestimation is likely due to the limitations in current treatment of marine isoprene emission and a coarse spatial resolution used in the model simulations.}, number={1}, journal={Atmospheric Environment}, author={Gantt, B. and Meskhidze, N. and Zhang, Y. and Xu, J.}, year={2010}, pages={115–121} }
 @inbook{zhai_ning_xu_2006, title={Integrating IDS alert correlation and OS-level dependency tracking}, volume={3975}, DOI={10.1007/11760146_24}, abstractNote={Intrusion alert correlation techniques correlate alerts into meaningful groups or attack scenarios for the ease to understand by human analysts. However, the performance of correlation is undermined by the imperfectness of intrusion detection techniques. Falsely correlated alerts can be misleading to analysis. This paper presents a practical technique to improve alert correlation by integrating alert correlation techniques with OS-level object dependency tracking. With the support of more detailed and precise information from OS-level event logs, higher accuracy in alert correlation can be achieved. The paper also discusses the application of such integration in improving the accuracy of hypotheses about possibly missed attacks while reducing the complexity of the hypothesizing process. A series of experiments are performed to evaluate the effectiveness of the methods, and the results demonstrate significant improvements on correlation results with the proposed techniques.}, booktitle={Intelligence and Security Informatics: IEEE International Conference on Intelligence and Security Informatics, ISI 2006, San Diego, CA, USA, May 23-24, 2006. Proceedings (Lecture notes in computer science; 3975)}, publisher={Berlin; New York: Springer}, author={Zhai, Y. and Ning, P. and Xu, J.}, year={2006}, pages={272–284} }
 @article{chen_xu_kalbarczyk_iyer_2006, title={Security vulnerabilities: From analysis to detection and masking techniques}, volume={94}, number={2}, journal={Proceedings of the IEEE}, author={Chen, S. and Xu, J. and Kalbarczyk, Z. and Iyer, R. K.}, year={2006}, pages={407–418} }