Topic
Sidewinder
About: Sidewinder is a(n) research topic. Over the lifetime, 49 publication(s) have been published within this topic receiving 392 citation(s).
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TL;DR: Based on the behavior of the robots, the authors performed further animal studies, and used an iterative approach to improve the robots' capabilities and to better understand animal motion.
Abstract: Limbless organisms such as snakes can navigate nearly all terrain. In particular, desert-dwelling sidewinder rattlesnakes (Crotalus cerastes) operate effectively on inclined granular media (such as sand dunes) that induce failure in field-tested limbless robots through slipping and pitching. Our laboratory experiments reveal that as granular incline angle increases, sidewinder rattlesnakes increase the length of their body in contact with the sand. Implementing this strategy in a physical robot model of the snake enables the device to ascend sandy slopes close to the angle of maximum slope stability. Plate drag experiments demonstrate that granular yield stresses decrease with increasing incline angle. Together, these three approaches demonstrate how sidewinding with contact-length control mitigates failure on granular media.
152 citations
Patent•
09 May 1991
TL;DR: In this paper, a player is challenged to keep a rolling ball to its objective descending, planar, zig-zag path by manipulating the rotation of the plane of the path.
Abstract: A carnival or amusement park game in which a player is challenged to keep a rolling ball to its objective descending, planar, zig-zag path by manipulating the rotation of the plane of the path. The game may be further enhanced by providing rotational steering alternatives, providing for coin operation, or by providing a device to record or signal the event of a successful play.
32 citations
29 citations
22 Jun 2009
TL;DR: Sidewinder is a predictive data forwarding protocol for mobile wireless sensor networks that continuously predicts the current sink location based on distributed knowledge of sink mobility among nodes in a multi-hop routing process and significantly outperforms state-of-the-art solutions in packet delivery ratio, time delay, and energy efficiency.
Abstract: In-situ data collection for mobile wireless sensor network deployments has received little study, such as in the case of floating sensor networks for storm surge and innundation monitoring. We demonstrate through quantitative study that traditional approaches to routing in mobile environments do not work well due to volatile topology changes. Consequently, we propose Sidewinder, a predictive data forwarding protocol for mobile wireless sensor networks. Like a heat-seeking missile, data packets are guided towards a sink node with increasing accuracy as packets approach the sink. Different from conventional sensor network routing protocols, Sidewinder continuously predicts the current sink location based on distributed knowledge of sink mobility among nodes in a multi-hop routing process. Moreover, the continuous sink estimation is scaled and adjusted to perform with resource-constrained wireless sensors. Our design is implemented with nesC and evaluated in TOSSIM. The performance evaluation demonstrates that Sidewinder significantly outperforms state-of-the-art solutions in packet delivery ratio, time delay, and energy efficiency.
23 citations
TL;DR: Sidewinder prevents an attack on an Internet server from accessing domains serving internal, protected networks, and an attacker cannot overrun a Sidewinder because the type enforcement restrictions cannot be disabled while the system is handling network traffic.
Abstract: Sites use firewalls to defend against external attacks while providing necessary Internet services. Firewalls make a site safer: They present a smaller risk since they provide fewer services. However, most firewalls use standard computer operating systems. This can allow an attacker to overrun the firewall if a known security flaw is present. The Sidewinder(TM) firewall system overcomes this problem using type enforcement.
Network server applications operate in independently controlled compartments called domains, each granted specific permission to access particular types of files or communicate with other domains. If a server succumbs to an attack, type enforcement restricts the amount of damage an attacker can do. In particular, Sidewinder prevents an attack on an Internet server from accessing domains serving internal, protected networks. An attacker cannot overrun a Sidewinder because the type enforcement restrictions cannot be disabled while the system is handling network traffic.
22 citations