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Ontogeny of vocal rhythms in harbor seal pups: an exploratory study

Current Zoology 2019年第1期65卷 107-120页

作者： Andrea RAViGNANi Christopher T. Kello Koen de Reus Sonja A KoTz Simone Dalla BELLA margarita mendez-arostegui Beatriz Rapado-Tamarit Ana Rubio-Garcia Bart de BoER Research Department Sealcentre Pieterburen Pieterburen The Netherlands Artificial Intelligenee Lab Vrije Universiteit Brussel Brussels Belgium Cognitive and Information Sciences University of California Merced CA USA Basic and Applied NeuroDynamics Lab Faculty of Psychology and Neuroscience Department of Neuropsychology & Psychopharmacology Maastricht University Maastricht The Netherlands Department of Neuropsychology Max-Planck Institute for Human Cognitive and Brain Sciences Leipzig Germany International Laboratory for Brain Music and Sound Research (BRAMS) Montreal QC Canada Department of Psychology University of Montreal Montreal QC Canada Department of Cognitive Psychology WSFiZ in Warsaw Warsaw Poland

Puppyhood is a very active social and vocal period in a harbor seal's life Ph oca vitulina. An important feature of vocalizations is their temporal and rhythmic structure, and understanding vocal timing and rhythms in harbor seals is critical to a cross-species hypothesis in evolutionary neuroscience that links vocal learning, rhythm perception, and synchronization. This study utilized analytical techniques that may best capture rhythmic structure in pup vocalizations with the goal of examining whether (1) harbor seal pups show rhythmic structure in their calls and (2) rhythms evolve over time. Calls of 3 wild-born seal pups were recorded daily over the course of 1-3 weeks;3 temporal features were analyzed using 3 complementary techniques. We identified temporal and rhythmic structure in pup calls across different time windows. The calls of harbor seal pups exhibit some degree of temporal and rhythmic organization, which evolves over puppyhood and resembles that of other species' in teractive comm un icati on. We suggest n ext steps for investigating call structure in harbor seal pups and propose comparative hypotheses to test in other pinniped species.

关键词： bioacoustics pinnipeds rhythm timing vocal development

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Modelling the Performance of a Cross-Layer TCP NewReno-HARQ System

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International Journal of Communications, Network and System Sciences 2010年第1期3卷 19-31页

作者： Nimbe L. EWALD-arostegui Andrew H. KEMP 不详

This paper presents an analytical model of a cross-layer communication system to enable improvement in the Transmission Control Protocol (TCP) over mixed wired and wireless Internet. The focus is on the quantitative performance evaluation of the interactions between TCP NewReno and a hybrid Automatic Repeat reQuest protocol (HARQ) in the link layer (LL) with a finite buffer size. The significant improvement in TCP NewReno throughput when HARQ adaptively selects its optimal settings according to explicit cross-layer information is shown. Through ns-2 simulations, it is demonstrated that this proposed analytical model accurately predicts the TCP-HARQ system performance.

关键词： HARQ TCP Markov Chains M/G/1/K Processes

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