Some standard numerical problems become intractable in high dimensions. Yet successes are often achieved in practice. This may be explained in terms of the underlying target function being somehow simpler than assumed in the intractability arguments. A prototypical form of simplicity is approximate linearity. In moderate dimensions linearity can be investigated by linear regression. In very hig...

The units found strongly efficient in DEA studies on efficiency can be divided into self-evaluators and active peers, depending on whether the peers are referencing any inefficient units or not. The contribution of the paper starts with subdividing the selfevaluators into interior and exterior ones. The exterior self-evaluators are efficient “by default”; there is no firm evidence from observat...

participative management tries to help organizations to meet their goals and satisfy stakeholders to reach their purposes, and one of its subsystems is suggestion system which is a form of employee – to – management communication that benefit employees as well as employers. in iran and in relation to establishing participative management, the management and planning organization asked public or...

I review radiatively inefficient accretion flow models for the≈ 2.6×106M black hole (BH) in the Galactic Center. I argue for a ’concordance model’ of Sgr A*: both theory and observations suggest that hot ambient gas around the BH is accreted at a rate ∼ 10−8M yr−1, much less than the canonical Bondi rate. I interpret Chandra observations of Sgr A* in the context of such a model: (1) the extende...

Robust PCA methods are typically batch algorithms which requires loading all observations into memory before processing. This makes them inefficient to process big data. In this paper, we develop an efficient online robust principal component methods, namely online moving window robust principal component analysis (OMWRPCA). Unlike existing algorithms, OMWRPCA can successfully track not only sl...

It is generally believed that, after water ingestion, the young infant can neither dilute his urine nor increase the rate of urine flow as rapidly or as effectively as the adult (1-4). Although several sound investigations (4-6) have demonstrated that the kidneys of newborn animals are relatively inefficient in this regard, there have been very few direct observations on these important functio...

Inefficient product derivation practices can greatly diminish the productivity gains expected from a software product line approach. As a foundation for systematic and efficient product derivation a better understanding of the underlying activities in industrial product line development is required. We have developed a process framework that comprises important tasks product line stakeholders h...

Particle filters provide a means to track the state of an object even when the dynamics and the observations are non-linear/nonGaussian. However, they can be very inefficient when the observation noise is low as compared to the system noise, as it is often the case in visual tracking applications. In this paper we propose a new two-stage sampling procedure to boost the performance of particle f...

Transactions at non-equilibrium prices are “false trades”. Under standard assumptions, markets without false trading produce Pareto-efficient outputs. This paper demonstrates graphically the complications created when false trades occur, showing that quantities produced deviate from Pareto-efficient quantities except under unique conditions. In a general equilibrium framework, this spills over ...

We model thermal evolution of magnetars with a phenomenological heat source in a spherical internal layer and compare the results with observations of persistent thermal radiation from magnetars. We show that the heat source should be located in the outer magnetar’s crust, at densities ρ 5 × 1011 g cm−3, and the heating rate should be ∼ 1020 erg cm−3 s−1. Heating deeper layers is extremely inef...