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Botnets • Bot • an instance of malware that runs on a compromised machine, without the owner's consent • the bot connects to a Command and Control (C&C) channel and waits to receive commands • Botnet • A group of bot-compromised machines controlled by a botmaster • Bots in the same botnet receive commands from the same botmaster and respond/act in a(More)
Botnets are now recognized as one of the most serious security threats. In contrast to previous malware, botnets have the characteristic of a command and control (C&C) channel. Botnets also often use existing common protocols, e.g., IRC, HTTP, and in protocol-conforming manners. This makes the detection of botnet C&C a challenging problem. In this paper, we(More)
Cryo-electron microscopy produces 3D density maps of molecular machines, which consist of various molecular components such as proteins and RNA. Segmentation of individual components in such maps is a challenging task, and is mostly accomplished interactively. We present an approach based on the immersive watershed method and grouping of the resulting(More)
A drive-by download attack occurs when a user visits a webpage which attempts to automatically download malware without the user's consent. Attackers sometimes use a <i>malware distribution network</i> (MDN) to manage a large number of malicious webpages, exploits, and malware executables. In this paper, we provide a new method to determine these MDNs from(More)
Peer-to-peer (P2P) botnets have recently been adopted by botmasters for their resiliency to take-down efforts. Besides being harder to take down, modern botnets tend to be stealthier in the way they perform malicious activities, making current detection approaches, including [6], ineffective. In this paper, we propose a novel botnet detection system that is(More)
Acrolein-induced oxidative stress is hypothesized to involve in the etiology of Alzheimer's disease (AD). Caffeic acid (CA) and caffeic acid phenethyl ester (CAPE) have antioxidative and neuroprotective properties. The present study investigated the protective effects of CA/CAPE on acrolein-induced oxidative neuronal toxicity. HT22 mouse hippocampal cells(More)
Group II chaperonins are essential mediators of cellular protein folding in eukaryotes and archaea. These oligomeric protein machines, approximately 1 megadalton, consist of two back-to-back rings encompassing a central cavity that accommodates polypeptide substrates. Chaperonin-mediated protein folding is critically dependent on the closure of a built-in(More)
Skid-steered mobile robots are widely used because of their simple mechanism and high reliability. Understanding the kinematics and dynamics of such a robotic platform is, however, challenging due to the complex wheel/ground interactions and kinematic constraints. In this paper, we develop a kinematic modeling scheme to analyze the skid-steered mobile(More)
Bi-section bandwidth is a critical resource in today's data centers because of the high cost and limited bandwidth of higher-level network switches and routers. This problem is aggravated in virtualized environments where a set of virtual machines, jointly implementing some service, may run across multiple L2 hops. Since data center administrators typically(More)
Skid-steered mobile robots have been widely used for terrain exploration and navigation. In this paper, we present an adaptive trajectory control design for a skid-steered wheeled mobile robot. Kinematic and dynamic modeling of the robot is first presented. A pseudo-static friction model is used to capture the interaction between the wheels and the ground.(More)