The Experts below are selected from a list of 12720 Experts worldwide ranked by ideXlab platform
Nicholas Hopper - One of the best experts on this subject based on the ideXlab platform.
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Vampire attacks draining life from wireless ad hoc sensor networks
IEEE Transactions on Mobile Computing, 2013Co-Authors: Eugene Y Vasserman, Nicholas HopperAbstract:Ad hoc low-power wireless networks are an exciting research direction in sensing and pervasive computing. Prior security work in this area has focused primarily on denial of communication at the routing or medium access control levels. This paper explores resource depletion attacks at the routing protocol layer, which permanently disable networks by quickly draining nodes' battery power. These "Vampire” attacks are not specific to any specific protocol, but rather rely on the properties of many popular classes of routing protocols. We find that all examined protocols are susceptible to Vampire attacks, which are devastating, difficult to detect, and are easy to carry out using as few as one malicious insider sending only protocol-compliant messages. In the worst case, a single Vampire can increase network-wide energy usage by a factor of O(N), where N in the number of network nodes. We discuss methods to mitigate these types of attacks, including a new proof-of-concept protocol that provably bounds the damage caused by Vampires during the packet forwarding phase.
Eugene Y Vasserman - One of the best experts on this subject based on the ideXlab platform.
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Vampire attacks draining life from wireless ad hoc sensor networks
IEEE Transactions on Mobile Computing, 2013Co-Authors: Eugene Y Vasserman, Nicholas HopperAbstract:Ad hoc low-power wireless networks are an exciting research direction in sensing and pervasive computing. Prior security work in this area has focused primarily on denial of communication at the routing or medium access control levels. This paper explores resource depletion attacks at the routing protocol layer, which permanently disable networks by quickly draining nodes' battery power. These "Vampire” attacks are not specific to any specific protocol, but rather rely on the properties of many popular classes of routing protocols. We find that all examined protocols are susceptible to Vampire attacks, which are devastating, difficult to detect, and are easy to carry out using as few as one malicious insider sending only protocol-compliant messages. In the worst case, a single Vampire can increase network-wide energy usage by a factor of O(N), where N in the number of network nodes. We discuss methods to mitigate these types of attacks, including a new proof-of-concept protocol that provably bounds the damage caused by Vampires during the packet forwarding phase.
Valle Del Cauca - One of the best experts on this subject based on the ideXlab platform.
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Análisis filogenético del murciélago hematófago Desmodus rotundus en el Valle del Cauca Colombia Phylogenetic analyses of the hematophagous bat Desmodus rotundus in Valle del Cauca, Colombia
2016Co-Authors: Fernando Favian, Castro Castro, Jaime Eduardo, Muñoz Flores, Wilson Uieda, Valle Del CaucaAbstract:Phylogenetic analyses of the hematophagous bat Desmodus rotundus were performed in villages belonging to Valle del Cauca, Cauca and Amazonas regions. Samples were mainly collected at hematophagous bat shelters located in Victoria, Aguila, Obando, Cartago, Zarzal, San Pedro, Cerrito and Palmira villages belonging to Valle del Cauca region, two samples at Mercaredes which belong to Cauca, two samples at Puerto Narino which is part of Amazonas region. Epithelial tissue samples were collected from bat’s patagium, and submitted to PCR using primers 16 SL and 16SH amplifying mitochondrial DNA of 50 Vampires, these products were sequencing resulting in eight haplotypes being the most common presented in 43 individuals. Two methods to reach maximum likelihood and parsimony were used. GENBANK sequences of mitochondrial markers s16 rRNA from Brazil, Venezuela and Costa Rica were used for comparison. Higher similarity between Vampire bats from Valle del Cauca and Cauca region, located in the southwest Colombia and Vampire bats from Costa Rica and Venezuela was found. In the present study the genetic profiles correlated with the phylogeographic aspects of different populations was performed and a connection between different haplotypes of existing clades was found according to the phylogenetic tree and haplotype net, possible being generated during hematophagous bats migration over the mountain-chain and rivers crossing Colombia.
Anne Lavergne - One of the best experts on this subject based on the ideXlab platform.
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How Social Structure Drives the Population Dynamics of the Common Vampire Bat (Desmodus rotundus, Phyllostomidae)
Journal of Heredity, 2018Co-Authors: Maïlis Huguin, Marguerite Delaval, Amandine Guidez, Nidia Arechiga-ceballos, Isaï Jorge De Castro, Vincent Lacoste, Arielle Salmier, Alvaro Aguilar Setién, Claudia Regina Silva, Anne LavergneAbstract:Social systems are major drivers of population structure and gene flow, with important effects on dynamics and dispersal of associated populations of parasites. Among bats, the common Vampire bat (Desmodus rotundus) has likely one of the most complex social structures. Using autosomal and mitochondrial markers on Vampires from Mexico, French Guiana, and North Brazil, from both roosting and foraging areas, we observed an isolation by distance at the wider scale and lower but significant differentiation between closer populations (
Candace R. Benefiel - One of the best experts on this subject based on the ideXlab platform.
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The Vampire Film: Undead Cinema
Extrapolation, 2014Co-Authors: Candace R. BenefielAbstract:Fangs on Film. Jeffrey A. Weinstock. The Vampire Film: Undead Cinema. New York: Columbia University Press, 2012. 144 pp. ISBN 9780231162012. $20 pbk.Reviewed by Candace R. Bene fielThe Vampire Film is the forty-eighth entry in Columbia University Press's Short Cuts series, which is meant to provide an introduction to various topics in film studies. Weinstock approaches the vast Gothic space of the Vampire film with some trepidation; in fact, he begins by saying "it is a book that I am tempted to say almost does not need to be written" (i). While it is true that the cinematic Vampire has been the focus of scholarly attention for decades, the subject is far from exhausted. Weinstock takes the view that the Vampire film is often most concerned with itself and, as such, it obviates outside discussion. Despite this initial disclaimer, however, he manages to devote the remainder of the volume to discussions of the Vampire film from several angles of incidence.In a short introduction, he lays out a "handful of principles" that he says govern all Vampire films. He explains that the Vampire "resistjs] any all-encompassing one-to-one metaphoric interpretation" (13). Within his rubric, it is possible to find a number of the standard Western interpretations of the Vampire. Thus he posits as principle #1 that the cinematic Vampire is always about sex, particularly in a hyperbolic performance of gender that both enables them to pass as human yet simultaneously provides an almost parodie hypermasculinity (or femininity) underscoring the shortcomings of traditional gender roles. As he puts it, Edward Cullen of the Twilight Saga is "impossibly manly-more manly than any human male" (8). Other principles include that the Vampire is more interesting than the Vampire slayer, that the Vampire always returns, that the Vampire is an "overdetermined body condensing what a culture considers 'other'" (13), and that Vampire films are always about technology.Weinstock's penultimate principle bears some examination. He argues that the Vampire film genre does not exist, with a corollary to the principle that Vampire films are inevitably intertextual (16). The sheer number and diversity of Vampires in film militates against a single categorization. This position is not difficult to support, given that Vampires may be found in everything from Gothic horror settings to science fiction, including detours along the way through the Western, the romance, the action film, and so on. If, as Weinstock says, the Vampire is a creature that spans all genres, defining and colonizing them, it might be that the book is slightly mistitled. Perhaps it should have been "The Vampire in Film"-a narrow distinction, perhaps, but a valid one. He goes on to discuss the intertexuality of the cinematic Vampire, which glances back at older interpretations and nods to the created mythology that governs, in some fashion, almost all Vampires on screen. Clearly, the model for the film Vampire owes its greatest debt to Bram Stoker's seminal novel Dracula (1897), especially in the iconic portrayal of that character by Bela Lugosi. Weinstock borrows from Henry Jenkins to label the viewer of Vampire films as "Vampire textual nomads" (18) and notes that, in Western culture, anyone exposed to popular culture has absorbed the basics of the cinematic Vampire. And it's difficult to argue with that.After the introduction, the book is divided into three main chapters: "Vampire Sex," "Vampire Technology," and "Vampire Otherness." In "Vampire Sex," Weinstock observes (as have many others) that Vampires are the most erotically charged of the standard cinematic monsters. He describes the Vampire body as "fluid and transformative" and coursing with "polymorphously perverse sexual energy that refuses to be channeled into respectable heterosexual monogamy" (21). He illustrates this notion by comparing the silent era "vamp," most memorably portrayed by Theda Bara in A Fool There Was (1915), to the contemporary Vampire hero of Twilight, Edward Cullen. …
