The Experts below are selected from a list of 294 Experts worldwide ranked by ideXlab platform
Chengyu Cao - One of the best experts on this subject based on the ideXlab platform.
-
Hawk an unmanned mini helicopter based aerial wireless kit for localization
IEEE Transactions on Mobile Computing, 2014Co-Authors: Zhongli Liu, Yinjie Chen, Benyuan Liu, Chengyu CaoAbstract:This paper presents a fully functional and highly portable mini Unmanned Aerial Vehicle (UAV) system, Hawk, for conducting aerial localization. Hawk is a programmable mini helicopter Draganflyer X6 armed with a wireless sniffer Nokia N900. We developed custom PI-Control laws to implement a robust waypoint algorithm for the mini helicopter to fly a planned route. A Moore space filling curve is designed as a flight route for Hawk to survey a specific area. A set of theorems were derived to calculate the minimum Moore curve level for sensing all targets in the area with minimum flight distance. With such a flight strategy, we can confine the location of a target of interest to a small hot area. We can recursively apply the Moore curve-based flight route to the hot area for a fine-grained localization of a target of interest. We have conducted extensive experiments to validate the feasibility of Hawk and our theory. A demo of Hawk in autonomous fly is available at http://www.youtube.com/watch?v=ju86xnHbEq0.
-
Hawk an unmanned mini helicopter based aerial wireless kit for localization
International Conference on Computer Communications, 2012Co-Authors: Zhongli Liu, Yinjie Chen, Benyuan Liu, Chengyu CaoAbstract:This paper presents a fully functional and highly portable mini Unmanned Aerial Vehicle (UAV) system, Hawk, for conducting aerial localization. Hawk is a programmable mini helicopter - Draganflyer X6 - armed with a wireless sniffer - Nokia N900. We developed custom PI-Control laws to implement a robust waypoint algorithm for the mini helicopter to fly a planned route. A Moore space filling curve is designed as a flight route for Hawk to survey a specific area. A set of theorems were derived to calculate the minimum Moore curve level for sensing all targets in the area with minimum flight distance. With such a flight strategy, we can confine the location of a target of interest to a small hot area. We can recursively apply the Moore curve based flight route to the hot area for a fine-grained localization of a target of interest. Therefore, Hawk does not rely on a positioning infrastructure for localization. We have conducted extensive experiments to validate the feasibility of Hawk and our theory. A demo of Hawk in autonomous fly is available at http://www.youtube.com/watch?v=ju86xnHbEq0.
Holly B Ernest - One of the best experts on this subject based on the ideXlab platform.
-
Reduced MHC and neutral variation in the Galápagos Hawk, an island endemic
BMC evolutionary biology, 2011Co-Authors: Jennifer L. Bollmer, Holly B Ernest, Joshua M Hull, José Hernán Sarasola, Patricia G. ParkerAbstract:Genes at the major histocompatibility complex (MHC) are known for high levels of polymorphism maintained by balancing selection. In small or bottlenecked populations, however, genetic drift may be strong enough to overwhelm the effect of balancing selection, resulting in reduced MHC variability. In this study we investigated MHC evolution in two recently diverged bird species: the endemic Galapagos Hawk (Buteo galapagoensis), which occurs in small, isolated island populations, and its widespread mainland relative, the Swainson's Hawk (B. swainsoni). We amplified at least two MHC class II B gene copies in each species. We recovered only three different sequences from 32 Galapagos Hawks, while we amplified 20 unique sequences in 20 Swainson's Hawks. Most of the sequences clustered into two groups in a phylogenetic network, with one group likely representing pseudogenes or nonclassical loci. Neutral genetic diversity at 17 microsatellite loci was also reduced in the Galapagos Hawk compared to the Swainson's Hawk. The corresponding loss in neutral diversity suggests that the reduced variability present at Galapagos Hawk MHC class II B genes compared to the Swainson's Hawk is primarily due to a founder event followed by ongoing genetic drift in small populations. However, purifying selection could also explain the low number of MHC alleles present. This lack of variation at genes involved in the adaptive immune response could be cause for concern should novel diseases reach the archipelago.
-
hybridization among buteos swainson s Hawks buteo swainsoni x red tailed Hawks buteo jamaicensis
The Wilson Journal of Ornithology, 2007Co-Authors: Joshua M Hull, Jeff P Smith, Nicola Murphy, Lindsay Cullen, Adam C Hutchins, Wesley K Savage, Holly B ErnestAbstract:Abstract We report three cases of hybridization between wild Swainson's Hawks (Buteo swainsoni) and Red-tailed Hawks (B. jamaicensis) identified by using nuclear and mitochondrial DNA markers. The hybrid individuals were field-identified as Swainson's Hawks and sampled from Alberta, Canada (n = 2) and Utah, USA (n = 1). Nineteen nuclear microsatellite loci were used in a factorial correspondence analysis to create genotypic clusters of 468 Red-tailed and 357 Swainson's Hawks. Three suspected hybrids were identified by an intermediate genetic position between the genotypic clusters of the two species, indicating a hybridogenetic composition. We examined mitochondrial control region sequence data to identify the maternal background of the putative hybrids; two of the hybrid specimens had Red-tailed Hawk mtDNA haplotypes and the third a Swainson's Hawk haplotype. These results suggest that hybridization between these two species may occur in their shared breeding range and can result in reciprocal hybrid off...
-
development of 19 microsatellite loci for swainson s Hawks buteo swainsoni and other buteos
Molecular Ecology Notes, 2007Co-Authors: Joshua M Hull, Rick J Topinka, Danielle Tufts, Holly B ErnestAbstract:We developed 26 Swainson’s Hawk (Buteo swainsoni) microsatellite primers from CA, AAT, CATC and GAGAA enriched genomic libraries. Primers were tested in 357 Swainson’s Hawks from western North America as well as seven other Buteo species. These markers will have broad application in investigations of Buteo population structure and genetic diversity.
Zhongli Liu - One of the best experts on this subject based on the ideXlab platform.
-
Hawk an unmanned mini helicopter based aerial wireless kit for localization
IEEE Transactions on Mobile Computing, 2014Co-Authors: Zhongli Liu, Yinjie Chen, Benyuan Liu, Chengyu CaoAbstract:This paper presents a fully functional and highly portable mini Unmanned Aerial Vehicle (UAV) system, Hawk, for conducting aerial localization. Hawk is a programmable mini helicopter Draganflyer X6 armed with a wireless sniffer Nokia N900. We developed custom PI-Control laws to implement a robust waypoint algorithm for the mini helicopter to fly a planned route. A Moore space filling curve is designed as a flight route for Hawk to survey a specific area. A set of theorems were derived to calculate the minimum Moore curve level for sensing all targets in the area with minimum flight distance. With such a flight strategy, we can confine the location of a target of interest to a small hot area. We can recursively apply the Moore curve-based flight route to the hot area for a fine-grained localization of a target of interest. We have conducted extensive experiments to validate the feasibility of Hawk and our theory. A demo of Hawk in autonomous fly is available at http://www.youtube.com/watch?v=ju86xnHbEq0.
-
Hawk an unmanned mini helicopter based aerial wireless kit for localization
International Conference on Computer Communications, 2012Co-Authors: Zhongli Liu, Yinjie Chen, Benyuan Liu, Chengyu CaoAbstract:This paper presents a fully functional and highly portable mini Unmanned Aerial Vehicle (UAV) system, Hawk, for conducting aerial localization. Hawk is a programmable mini helicopter - Draganflyer X6 - armed with a wireless sniffer - Nokia N900. We developed custom PI-Control laws to implement a robust waypoint algorithm for the mini helicopter to fly a planned route. A Moore space filling curve is designed as a flight route for Hawk to survey a specific area. A set of theorems were derived to calculate the minimum Moore curve level for sensing all targets in the area with minimum flight distance. With such a flight strategy, we can confine the location of a target of interest to a small hot area. We can recursively apply the Moore curve based flight route to the hot area for a fine-grained localization of a target of interest. Therefore, Hawk does not rely on a positioning infrastructure for localization. We have conducted extensive experiments to validate the feasibility of Hawk and our theory. A demo of Hawk in autonomous fly is available at http://www.youtube.com/watch?v=ju86xnHbEq0.
Joshua M Hull - One of the best experts on this subject based on the ideXlab platform.
-
Reduced MHC and neutral variation in the Galápagos Hawk, an island endemic
BMC evolutionary biology, 2011Co-Authors: Jennifer L. Bollmer, Holly B Ernest, Joshua M Hull, José Hernán Sarasola, Patricia G. ParkerAbstract:Genes at the major histocompatibility complex (MHC) are known for high levels of polymorphism maintained by balancing selection. In small or bottlenecked populations, however, genetic drift may be strong enough to overwhelm the effect of balancing selection, resulting in reduced MHC variability. In this study we investigated MHC evolution in two recently diverged bird species: the endemic Galapagos Hawk (Buteo galapagoensis), which occurs in small, isolated island populations, and its widespread mainland relative, the Swainson's Hawk (B. swainsoni). We amplified at least two MHC class II B gene copies in each species. We recovered only three different sequences from 32 Galapagos Hawks, while we amplified 20 unique sequences in 20 Swainson's Hawks. Most of the sequences clustered into two groups in a phylogenetic network, with one group likely representing pseudogenes or nonclassical loci. Neutral genetic diversity at 17 microsatellite loci was also reduced in the Galapagos Hawk compared to the Swainson's Hawk. The corresponding loss in neutral diversity suggests that the reduced variability present at Galapagos Hawk MHC class II B genes compared to the Swainson's Hawk is primarily due to a founder event followed by ongoing genetic drift in small populations. However, purifying selection could also explain the low number of MHC alleles present. This lack of variation at genes involved in the adaptive immune response could be cause for concern should novel diseases reach the archipelago.
-
hybridization among buteos swainson s Hawks buteo swainsoni x red tailed Hawks buteo jamaicensis
The Wilson Journal of Ornithology, 2007Co-Authors: Joshua M Hull, Jeff P Smith, Nicola Murphy, Lindsay Cullen, Adam C Hutchins, Wesley K Savage, Holly B ErnestAbstract:Abstract We report three cases of hybridization between wild Swainson's Hawks (Buteo swainsoni) and Red-tailed Hawks (B. jamaicensis) identified by using nuclear and mitochondrial DNA markers. The hybrid individuals were field-identified as Swainson's Hawks and sampled from Alberta, Canada (n = 2) and Utah, USA (n = 1). Nineteen nuclear microsatellite loci were used in a factorial correspondence analysis to create genotypic clusters of 468 Red-tailed and 357 Swainson's Hawks. Three suspected hybrids were identified by an intermediate genetic position between the genotypic clusters of the two species, indicating a hybridogenetic composition. We examined mitochondrial control region sequence data to identify the maternal background of the putative hybrids; two of the hybrid specimens had Red-tailed Hawk mtDNA haplotypes and the third a Swainson's Hawk haplotype. These results suggest that hybridization between these two species may occur in their shared breeding range and can result in reciprocal hybrid off...
-
development of 19 microsatellite loci for swainson s Hawks buteo swainsoni and other buteos
Molecular Ecology Notes, 2007Co-Authors: Joshua M Hull, Rick J Topinka, Danielle Tufts, Holly B ErnestAbstract:We developed 26 Swainson’s Hawk (Buteo swainsoni) microsatellite primers from CA, AAT, CATC and GAGAA enriched genomic libraries. Primers were tested in 357 Swainson’s Hawks from western North America as well as seven other Buteo species. These markers will have broad application in investigations of Buteo population structure and genetic diversity.
Benyuan Liu - One of the best experts on this subject based on the ideXlab platform.
-
Hawk an unmanned mini helicopter based aerial wireless kit for localization
IEEE Transactions on Mobile Computing, 2014Co-Authors: Zhongli Liu, Yinjie Chen, Benyuan Liu, Chengyu CaoAbstract:This paper presents a fully functional and highly portable mini Unmanned Aerial Vehicle (UAV) system, Hawk, for conducting aerial localization. Hawk is a programmable mini helicopter Draganflyer X6 armed with a wireless sniffer Nokia N900. We developed custom PI-Control laws to implement a robust waypoint algorithm for the mini helicopter to fly a planned route. A Moore space filling curve is designed as a flight route for Hawk to survey a specific area. A set of theorems were derived to calculate the minimum Moore curve level for sensing all targets in the area with minimum flight distance. With such a flight strategy, we can confine the location of a target of interest to a small hot area. We can recursively apply the Moore curve-based flight route to the hot area for a fine-grained localization of a target of interest. We have conducted extensive experiments to validate the feasibility of Hawk and our theory. A demo of Hawk in autonomous fly is available at http://www.youtube.com/watch?v=ju86xnHbEq0.
-
Hawk an unmanned mini helicopter based aerial wireless kit for localization
International Conference on Computer Communications, 2012Co-Authors: Zhongli Liu, Yinjie Chen, Benyuan Liu, Chengyu CaoAbstract:This paper presents a fully functional and highly portable mini Unmanned Aerial Vehicle (UAV) system, Hawk, for conducting aerial localization. Hawk is a programmable mini helicopter - Draganflyer X6 - armed with a wireless sniffer - Nokia N900. We developed custom PI-Control laws to implement a robust waypoint algorithm for the mini helicopter to fly a planned route. A Moore space filling curve is designed as a flight route for Hawk to survey a specific area. A set of theorems were derived to calculate the minimum Moore curve level for sensing all targets in the area with minimum flight distance. With such a flight strategy, we can confine the location of a target of interest to a small hot area. We can recursively apply the Moore curve based flight route to the hot area for a fine-grained localization of a target of interest. Therefore, Hawk does not rely on a positioning infrastructure for localization. We have conducted extensive experiments to validate the feasibility of Hawk and our theory. A demo of Hawk in autonomous fly is available at http://www.youtube.com/watch?v=ju86xnHbEq0.
