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Intrusion detection is an important technique in the defense-in-depth network security framework and a hot topic in computer network security in recent years. In this paper, a new efficient intrusion detection method based on Hidden Markov Models (HMMs) is presented. HMMs are applied to model the normal program behaviors using traces of system calls issued(More)
Accurate modeling and simulation of underwater vehicles is essential for autonomous control. In this paper, we present a dynamic model of the VideoRay Pro III microROV, in which the hydrodynamic derivatives are determined both theoretically and experimentally, based on the assumption that the motions in different directions are decoupled. The experi­ ments(More)
Secure wireless communication is a challenging problem due to the shared nature of the wireless medium and the dynamic channel. Most of the existing security mechanisms focus on traditional cryptographic schemes. In recent years, features of multi-path channels, such as randomness, coherence and reciprocity, have driven researchers to exploit their(More)
In this study we proposed two Quasi-Newton methods to deal with traffic assignment in the capacitated network. The methods combine Newton formula, column generation and penalty techniques. The first method employ the gradient of the objective function to obtain an improving feasible direction scaled by the second-order derivatives. The second one is to(More)
We report microbially facilitated synthesis of cadmium sulfide (CdS) nanostructured particles (NP) using anaerobic, metal-reducing Thermoanaerobacter sp. The extracellular CdS crystallites were <10 nm in size with yields of ~3 g/L of growth medium/month with demonstrated reproducibility and scalability up to 24 L. During synthesis, Thermoanaerobacter(More)
A sputtered oxide layer enabled by a solution-processed oxide nanoparticle buffer layer to protect underlying layers is used to make semi-transparent perovskite solar cells. Single-junction semi-transparent cells are 12.3% efficient, and mechanically stacked tandems on silicon solar cells are 18.0% efficient. The semi-transparent perovskite solar cell has a(More)
Multipath is undesirable for Global Navigation Satellite System (GNSS) receivers, since the reception of multipath can create a significant distortion to the shape of the correlation function leading to an error in the receiv-ers' position estimate. Many multipath mitigation techniques exist in the literature to deal with the multipath propagation problem(More)