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Protocol Design (protocol + design)
Selected AbstractsEffort/gains dynamics in heterogeneous networksINTERNATIONAL JOURNAL OF COMMUNICATION SYSTEMS, Issue 4 2008L. Mamatas Abstract We investigate the behaviour of TCP(,, ,) protocols in the presence of wireless networks. We seek an answer to strategic issues of maximizing energy and bandwidth exploitation, without damaging the dynamics of multiple-flow equilibrium. We take a fresh perspective on protocol design: What is the return of the effort that a protocol expends? Can we achieve more gains with less effort? We study first the design assumptions of TCP(,, ,) protocols and discuss the impact of equation-based modulation of , and , on protocol efficiency. We introduce two new measures to capture protocol behaviour: the ,Extra Energy Expenditure' and the ,Unexploited Available Resource Index'. We confirm experimentally that, in general, smoothness and responsiveness constitute a tradeoff; however, we show that this tradeoff does not graft its dynamics into a conservative/aggressive behaviour, as it is traditionally believed. We uncover patterns of unjustified tactics; our results suggest that an adaptive congestion control algorithm is needed to integrate the dynamics of heterogeneous networks into protocol behaviour. Copyright © 2007 John Wiley & Sons, Ltd. [source] Survey of environmental enhancement programs for laboratory primatesAMERICAN JOURNAL OF PRIMATOLOGY, Issue 4 2007Kate C. Baker Abstract Animal welfare regulations in the United States require that nonhuman primate environmental enhancement plans be made in accordance with currently accepted professional standards; however, little information is available for quantifying common practice. Here we report the results of a 2003 survey that was sent to individuals overseeing enrichment programs at a variety of primate research institutions. The surveys requested information on program administration and management, implementation standards, procedures, and constraints pertaining to major categories of environmental enrichment, as well as intervention plans for animals exhibiting behavioral pathologies. Data were obtained on the management of 35,863 primates in 22 facilities. Behavioral scientists performed program oversight at the majority of facilities. Most programs reported recent changes, most commonly due to external site visits, and least commonly resulting from internal review. Most facilities' institutional animal care and use committees (IACUCs) included of individuals with behavioral expertise, and about two-thirds reported that enrichment issues could influence research protocol design. While most primates were reported to be housed socially (73%), social housing for indoor-housed primates appears to have changed little over the past 10 years. Research protocol issues and social incompatibility were commonly cited constraints. Implementation of feeding, manipulanda, and structural enrichment was relatively unconstrained, and contributions to these aspects of behavioral management generally included individuals in a wide variety of positions within a facility. In contrast, enrichment devices were used on a less widespread basis within facilities, and positive reinforcement programs that involved dedicated trainers were rare. We suggest that altering the role of the IACUC would be a productive avenue for increasing the implementation of social housing, and that an emphasis on prevention rather than intervention against behavioral pathology is warranted. The data from this survey may be useful for anticipating future program evaluations, establishing more effective internal evaluations, and assessing program progress and resource allocation. Am. J. Primatol. 69:1,18, 2007. © 2006 Wiley-Liss, Inc. [source] Effect of body size, photophase, feeding and emersion on the oxygen consumption of the east coast rock lobster Panulirus homarus rubellusAQUACULTURE RESEARCH, Issue 7 2009Justin O G Kemp Abstract An understanding of the effect of key intrinsic and extrinsic factors on the oxygen consumption of Panulirus homarus rubellus is imperative for the development of optimized transport, holding and growout protocols. This study investigated the effect of body weight, photophase, feeding and emersion on the oxygen consumption rate of P. h. rubellus. Body weight was positively correlated to both standard and active oxygen consumption (mg O2 h,1) while body weight was negatively correlated to mass-specific standard oxygen uptake (mg O2 g,1 h,1). Diurnal rhythm exhibited a strong effect on the lobsters' oxygen consumption, with average nighttime values 67% greater than those recorded during the day. This was related to activity driven by intrinsic nocturnal foraging behaviour. Feeding resulted in a classic specific dynamic action response, with postprandial oxygen consumption increasing to a peak before decreasing gradually to preprandial levels. Emersion caused a significant increase in oxygen consumption following re-immersion. Lobsters rapidly recovered to pre-emersion levels after 4 h following a 1-h emersion and after 13.3 h following an emersion period of 6 h. The implications of these results with regard to the holding/culture system and protocol design are discussed. [source] Finite time agreement protocol design of multi-agent systems with communication delays,,ASIAN JOURNAL OF CONTROL, Issue 3 2009Li Wang Abstract In this paper, the finite-time agreement problem of continuous-time multi-agent systems with communication delays is considered. First, the multi-agent system researched in the paper is described. Second, some notations and lemmas used in the paper are given. Then, agreement protocols for continuous (but non-smooth) multi-agent systems are proposed, which ensure that the states of agents reach agreement in finite time. The stability analysis and simulations are presented to show the effectiveness of the method. Copyright © 2009 John Wiley and Sons Asia Pte Ltd and Chinese Automatic Control Society [source] COALITION FORMATION IN A GLOBAL WARMING GAME: HOW THE DESIGN OF PROTOCOLS AFFECTS THE SUCCESS OF ENVIRONMENTAL TREATY-MAKINGNATURAL RESOURCE MODELING, Issue 3 2006JOHAN EYCKMANS ABSTRACT. We combine new concepts of noncooperative coalition theory with an integrated assessment model on climate change to analyze the impact of different protocol designs on the success of coalition formation. We analyze the role of "single versus multiple coalitions,""open versus exclusive membership,""no, weak and strong consensus about membership" and "no transfers versus transfers." First, we want to find out whether and how modifications of the standard assumptions affect results that are associated with the widely applied cartel formation game in the noncooperative game theoretic analysis of international environmental agreements. Second, we discuss normative policy conclusions that emerge from the various modifications. Third, we confront our results with evidence on past international environmental treaties and derive an agenda for future research. [source] | |||||||||||||