Among the rich economies of the world today, per capita output levels had diverged before converging to the per capita output level of the frontier economy. Since frontier economies have grown at stable rates, non-frontier economies display an S-shape aggregate transition path. Along this transition, there are “catapult e¤ects”: longer episodes of divergence are associated with faster subsequen...

Frontier-based exploration method are known to be efficient for multi-robot exploration systems. In this paper, we propose a novel, computationally inexpensive, frontier allocation method favoring a well balanced spatial distribution of robots in the environment. It is based on the computation of a position criteria. The position of a robot towards a frontier is defined by the number of robots ...

Frontier-based exploration is the most common approach to exploration, a fundamental problem in robotics. In frontier-based exploration, robots explore by repeatedly computing (and moving towards) frontiers, the segments which separate the known regions from those unknown. However, most frontier detection algorithms process the entire map data. This can be a time consuming process which slows d...

Data envelopment analysis (DEA), originally developed to study production efficiency ofmicro-level organizations, has recently been used to adopt a production-frontier approach to the analysis of international macroeconomic growth and convergence patterns. DEA methods, however, are known to provide biased estimates of the production frontier and efficiency. We employ recent results from the sta...

There is increasing interest in fully ranking the performance of organizational units with multiple inputs and outputs. We smooth the congenital differences of efficient and inefficient units. The concept of the secondary frontier is to eliminate the effects of super-efficiency and inefficiency. The pseudo secondary frontier is constructed to lie between the efficient and inefficient units. Lo...

The structure and properties of niobapyrimidinium complex were examined by density functionaltheory method (mpw1pw91). The effect of solvent on the structural parameters, frontier orbitalenergies and hyperpolarizability (tot) of this molecule has been explored. The thermodynamicproperties of the title compound at different temperatures have been calculated. Also, the parasubstitutionseffect on ...

The rapid growth of the World Wide Web has created many challenges for both general purpose crawling, search engines and web directories, making it difficult to find, index, and classify web pages based on a topic. Topic driven crawlers can complement search engines because they pre-classify the pages retrieved by the crawl. To implement such a focused crawler, a strategy for ordering the crawl...

Hansen and Jagannathan (HJ, 1991) provided bounds on the volatility of Stochastic Discount Factors (SDF) that proved extremely useful to diagnose and test asset pricing models. This nonparametric bound reflects a duality between the meanstandard deviation frontier for SDFs and the mean-variance frontier for portfolios of asset returns. We extend this fundamental contribution by proposing inform...