418 research outputs found
Decentralised Dynamic Task Allocation Using Overlapping Potential Games
This paper reports on a novel decentralised technique for planning agent schedules in dynamic task allocation problems. Specifically, we use a stochastic game formulation of these problems in which tasks have varying hard deadlines and processing requirements. We then introduce a new technique for approximating this game using a series of static potential games, before detailing a decentralised method for solving the approximating games that uses the distributed stochastic algorithm. Finally, we discuss an implementation of our approach to a task allocation problem in the RoboCup Rescue disaster management simulator. The results show that our technique performs comparably to a centralised task scheduler (within 6% on average), and also, unlike its centralised counterpart, it is robust to restrictions on the agentsā communication and observation ranges
Determining the efficacy of potassium oxalate containing strips to reduce dentinal fluid flow in situ
Full-Depth Reclamation (FDR) for Preventive Maintenance: SR 65 Analysis
The INDOT and HNTB field inspection and management team for the I-65 Northwest Indiana Design-Build-Best Value project in Lake County, Indiana, will discuss differences in the implementation and reporting requirements for field personnel via this project delivery method versus a traditional design-bidbuild INDOT project
Full-Depth Reclamation (FDR) for Preventive Maintenance: SR 65 Analysis
The INDOT and HNTB field inspection and management team for the I-65 Northwest Indiana Design-Build-Best Value project in Lake County, Indiana, will discuss differences in the implementation and reporting requirements for field personnel via this project delivery method versus a traditional design-bidbuild INDOT project
Type oriented parallel programming for Exascale
Whilst there have been great advances in HPC hardware and software in recent
years, the languages and models that we use to program these machines have
remained much more static. This is not from a lack of effort, but instead by
virtue of the fact that the foundation that many programming languages are
built on is not sufficient for the level of expressivity required for parallel
work. The result is an implicit trade-off between programmability and
performance which is made worse due to the fact that, whilst many scientific
users are experts within their own fields, they are not HPC experts.
Type oriented programming looks to address this by encoding the complexity of
a language via the type system. Most of the language functionality is contained
within a loosely coupled type library that can be flexibly used to control many
aspects such as parallelism. Due to the high level nature of this approach
there is much information available during compilation which can be used for
optimisation and, in the absence of type information, the compiler can apply
sensible default options thus supporting both the expert programmer and novice
alike.
We demonstrate that, at no performance or scalability penalty when running on
up to 8196 cores of a Cray XE6 system, codes written in this type oriented
manner provide improved programmability. The programmer is able to write
simple, implicit parallel, HPC code at a high level and then explicitly tune by
adding additional type information if required.Comment: As presented at the Exascale Applications and Software Conference
(EASC), 9th-11th April 201
Impaired pre-competition wellbeing measures can negatively impact running performance in developmental youth female soccer players
This study aimed to determine the association between pre-competition perceived player wellbeing measures and subsequent relative and peak running performance of developmental youth female soccer players (n = 15, age: 16 Ā± 1 years). Total distance (TD), high-speed (> 3.5 m/s) (HSRD) and very high-speed (> 5.3 m/s) running (VHSRD) were expressed using 1-, 2- and 5-minute epochs and relative (per minute) calculations. Fatigue, sleep quality, upper and lower-body muscle soreness, stress, and mood wellbeing measures were collected via a self-reported questionnaire (1-5 Likert scale). Menstrual cycle phase was collected via a calendar-based countback method. Results demonstrated that reductions in stress was associated with decreased relative and peak TD in all epochs ( p = 0.008-0.040), relative and peak HSRD ( p = 0.006-0.039) in 2- and 5-minute epochs as well as VHSRD in 2-minute epochs ( p = 0.026). For example, a one-point reduction of 'normal' to 'relaxed' is associated with a decrease of 7 m/min in peak TD for 1-minute epochs. One-point increase in fatigue (e.g., 'normal' to 'more tired than normal') displayed a decrease of 7 m/min peak TD for 2-minute ( p = 0.048) and 9 m/min for 5-minute ( p = 0.007) rolling epochs. Likewise, one-point increase in lower-body muscle-soreness (e.g., 'normal' to 'increase in soreness/tightness') was associated with a reduction of 6 m/min peak VHSRD for 1-minute epochs ( p = 0.034). Results suggest that perceived player wellbeing can influence running performance. However, the magnitude of the change in player wellbeing should be considered in a practical sense. </p
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How soccer players head the ball: a test of optic acceleration cancellation theory with virtual reality
We measured the movements of soccer players heading a football in a fully immersive virtual reality environment. In mid-flight the ballās trajectory was altered from its normal quasi-parabolic path to a linear one, producing a jump in the rate of change of the angle of elevation of gaze (Ī±) from player to ball. One reaction time later the players adjusted their speed so that the rate of change of Ī± increased when it had been reduced and reduced it when it had been increased. Since the result of the playerās movement was to regain a value of the rate of change close to that before the disturbance, the data suggest that the players have an expectation of, and memory for, the pattern that the rate of change of Ī± will follow during the flight. The results support the general claim that players intercepting balls use servo control strategies and are consistent with the particular claim of Optic Acceleration Cancellation theory that the servo strategy is to allow Ī± to increase at a steadily decreasing rate
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