A MapReduce algorithm can be described by a mapping schema, which assigns inputs to a set of reducers, such that for each required output there exists a reducer that receives all the inputs that participate in the computation of this output. Reducers have a capacity, which limits the sets of inputs that they can be assigned. However, individual inputs may vary in terms of size. We consider, for...

The paper main objective is to model and analyze the properties of the Vaucanson planetary transmission in order to establish the possibility of using it in renewable energy systems. The structural features, the kinematical and static modeling of the initial Vaucanson speed reducer are presented in the first part of the paper.

The paper deals with some representative geometrical and dynamic aspects of a new cycloidal reducer variant with modified structure, proposed by the authors: geometrical optimization of the cycloidal gear, analysis of the transmission ratio and efficiency, and analysis of the dynamic response in a relevant functioning case.

Parallel graph reducers such as GUM use dynamic techniques to manage resources during execution. One important aspect of the dynamic behaviour is the distribution of work. The load balancing mechanism, which controls this aspect, should be flexible, to adjust the distribution of work to hardware characteristics as well as dynamic program characteristics, and scalable, to achieve high utilisatio...

BACKGROUND A growing population of patients lives with severe coronary artery disease not amenable to coronary revascularization and with refractory angina despite optimal medical therapy. Percutaneous reduction of the coronary sinus is an emerging treatment for myocardial ischemia that increases coronary sinus pressure to promote a transcollateral redistribution of coronary artery in-flow from...

The main limitation of centrifugal pump running in turbine mode is lower efficiency at part load operating conditions as compared to conventional hydro turbines. To enhance the utilization of pump as turbine (PAT) in mini/micro hydropower plants, it is very important to improve its performance with some low cost modifications. The part load efficiency of PAT can be improved by guiding the flow ...

Abstract Fracturing technology is the key of shale oil and gas exploitation in United States. The hydraulic fracturing lies formulation fluid, which can improve permeability layer, reduce pumping resistance, optimize production conditions, strata damage other purposes. Slick-water widely used water-based for unconventional exploitation, friction resistance. As core slickwater reducer determine ...

Abstract Hub motor is the development direction of new energy vehicles in future. Usually, reduction drive hub directly arranged narrow rim space, so there are strict restrictions on volume and weight its reducer. This paper presents a highly integrated transmission scheme which can improve working life For planetary gear reducer by motor, multi-objective optimization function with minimum larg...