The Experts below are selected from a list of 22776 Experts worldwide ranked by ideXlab platform
Tri Wahyu Susanto - One of the best experts on this subject based on the ideXlab platform.
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are male orangutans a threat to infants evidence of mother offspring counterstrategies to infanticide in bornean orangutans pongo pygmaeus wurmbii
International Journal of Primatology, 2019Co-Authors: Amy M Scott, Cheryl D Knott, Tri Wahyu SusantoAbstract:Sexually selected infanticide by males is widespread in primates. Female primates employ a variety of strategies to reduce infanticide risk. While infanticide has never been directly observed in wild orangutans (Pongo spp.), their slow life history makes infants vulnerable to infanticide. The mating strategies of female orangutans include polyandrous and postconceptive mating that may serve to increase paternity confusion, an infanticide Avoidance Strategy. Here, we investigate whether female orangutans alter their social interactions with males as another infanticide Avoidance Strategy. We hypothesize that females with younger offspring avoid males and that the distance between mother and offspring decreases in the presence of males. We use long-term behavioral data collected between 1994 and 2016 from Bornean orangutans (Pongo pygmaeus wurmbii) in Gunung Palung National Park, Indonesia, to test whether the sexual selection hypothesis for infanticide helps explain aspects of orangutan social behavior. We found that mothers with offspring 6 yr. old and females without offspring. In addition, the distance between a mother–offspring dyad showed a statistically significant decrease in the presence of males, but not females. Our results are consistent with the hypothesis that female orangutans employ strategies to reduce infanticide risk in their social interactions. Because orangutans have a high fission–fusion dynamic, they have flexibility in manipulating social interactions as a counterinfanticide Strategy. Our results suggest that infanticide by males is a selective pressure shaping female orangutan social behavior.
Amy M Scott - One of the best experts on this subject based on the ideXlab platform.
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are male orangutans a threat to infants evidence of mother offspring counterstrategies to infanticide in bornean orangutans pongo pygmaeus wurmbii
International Journal of Primatology, 2019Co-Authors: Amy M Scott, Cheryl D Knott, Tri Wahyu SusantoAbstract:Sexually selected infanticide by males is widespread in primates. Female primates employ a variety of strategies to reduce infanticide risk. While infanticide has never been directly observed in wild orangutans (Pongo spp.), their slow life history makes infants vulnerable to infanticide. The mating strategies of female orangutans include polyandrous and postconceptive mating that may serve to increase paternity confusion, an infanticide Avoidance Strategy. Here, we investigate whether female orangutans alter their social interactions with males as another infanticide Avoidance Strategy. We hypothesize that females with younger offspring avoid males and that the distance between mother and offspring decreases in the presence of males. We use long-term behavioral data collected between 1994 and 2016 from Bornean orangutans (Pongo pygmaeus wurmbii) in Gunung Palung National Park, Indonesia, to test whether the sexual selection hypothesis for infanticide helps explain aspects of orangutan social behavior. We found that mothers with offspring 6 yr. old and females without offspring. In addition, the distance between a mother–offspring dyad showed a statistically significant decrease in the presence of males, but not females. Our results are consistent with the hypothesis that female orangutans employ strategies to reduce infanticide risk in their social interactions. Because orangutans have a high fission–fusion dynamic, they have flexibility in manipulating social interactions as a counterinfanticide Strategy. Our results suggest that infanticide by males is a selective pressure shaping female orangutan social behavior.
Angela P Schoellig - One of the best experts on this subject based on the ideXlab platform.
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trajectory generation for multiagent point to point transitions via distributed model predictive control
International Conference on Robotics and Automation, 2019Co-Authors: Carlos E Luis, Angela P SchoelligAbstract:This letter introduces a novel algorithm for multiagent offline trajectory generation based on distributed model predictive control. Central to the algorithm's scalability and success is the development of an on-demand collision Avoidance Strategy. By predicting future states and sharing this information with their neighbors, the agents are able to detect and avoid collisions while moving toward their goals. The proposed algorithm can be implemented in a distributed fashion and reduces the computation time by more than 85% compared to previous optimization approaches based on sequential convex programming, while only having a small impact on the optimality of the plans. The approach was validated both through extensive simulations and experimentally with teams of up to 25 quadrotors flying in confined indoor spaces.
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trajectory generation for multiagent point to point transitions via distributed model predictive control
arXiv: Robotics, 2018Co-Authors: Carlos E Luis, Angela P SchoelligAbstract:This paper introduces a novel algorithm for multiagent offline trajectory generation based on distributed model predictive control. Central to the algorithm's scalability and success is the development of an on-demand collision Avoidance Strategy. By predicting future states and sharing this information with their neighbors, the agents are able to detect and avoid collisions while moving toward their goals. The proposed algorithm can be implemented in a distributed fashion and reduces the computation time by more than 85% compared to previous optimization approaches based on sequential convex programming, while only having a small impact on the optimality of the plans. The approach was validated both through extensive simulations and experimentally with teams of up to 25 quadrotors flying in confined indoor spaces.
Lichen Fu - One of the best experts on this subject based on the ideXlab platform.
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modelling control and simulation of an ic wafer fabrication system a generalized stochastic coloured timed petri net approach
International Journal of Production Research, 2000Co-Authors: Lichen FuAbstract:This study presents a generalized stochastic coloured timed Petri net(GSCTPN) to model an IC wafer fabrication system. According to the GSCTPN, it models the dynamic behaviours of the IC fabrication system, such as loading, reentrant processing, unloading and machine failure. Furthermore, modular and synthesis techniques are used to construct a large and complex system model. The two major sub-models are the Process-Flow Model and the Transportation Model. The Transportation Model incorporates a simple motion-planning rule and a collision Avoidance Strategy to solve the variable speed and traffic jam problems of vehicles. This work also describes a simulation based performance analysis and schedule adjustment. To demonstrate the promise of the proposed work, this study makes actual Taiwanese IC wafer fabrication systems the target plant layout for implementation.
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modeling analysis simulation and control of semiconductor manufacturing systems a generalized stochastic colored timed petri net approach
Systems Man and Cybernetics, 1999Co-Authors: Lichen FuAbstract:A generalized stochastic colored timed Petri net (GSCTPN) is used to model an IC wafer fabrication system. There are two major sub-models: a process flow model and transportation model. There are two different automated guided vehicle systems, namely, the interbay system and intrabay system. For multiple-load and variable-speed AGV systems, we embed a simple motion-planning rule and introduce a collision Avoidance Strategy in the model to solve the variable speed and traffic jam problems of vehicles. The simple control policies for AGV visiting and AGV routing are discussed. The heuristic rules for lot release and lot scheduling are also studied. To obtain performance measures, simulation is used. To show the promising potential of the proposed work, a real-word IC wafer fabrication system is used as a target plant layout for implementation.
Cheryl D Knott - One of the best experts on this subject based on the ideXlab platform.
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are male orangutans a threat to infants evidence of mother offspring counterstrategies to infanticide in bornean orangutans pongo pygmaeus wurmbii
International Journal of Primatology, 2019Co-Authors: Amy M Scott, Cheryl D Knott, Tri Wahyu SusantoAbstract:Sexually selected infanticide by males is widespread in primates. Female primates employ a variety of strategies to reduce infanticide risk. While infanticide has never been directly observed in wild orangutans (Pongo spp.), their slow life history makes infants vulnerable to infanticide. The mating strategies of female orangutans include polyandrous and postconceptive mating that may serve to increase paternity confusion, an infanticide Avoidance Strategy. Here, we investigate whether female orangutans alter their social interactions with males as another infanticide Avoidance Strategy. We hypothesize that females with younger offspring avoid males and that the distance between mother and offspring decreases in the presence of males. We use long-term behavioral data collected between 1994 and 2016 from Bornean orangutans (Pongo pygmaeus wurmbii) in Gunung Palung National Park, Indonesia, to test whether the sexual selection hypothesis for infanticide helps explain aspects of orangutan social behavior. We found that mothers with offspring 6 yr. old and females without offspring. In addition, the distance between a mother–offspring dyad showed a statistically significant decrease in the presence of males, but not females. Our results are consistent with the hypothesis that female orangutans employ strategies to reduce infanticide risk in their social interactions. Because orangutans have a high fission–fusion dynamic, they have flexibility in manipulating social interactions as a counterinfanticide Strategy. Our results suggest that infanticide by males is a selective pressure shaping female orangutan social behavior.
