26 research outputs found
Phenomenology of minority games in efficient regime
We present a comprehensive study of utility function of the minority game in
its efficient regime. We develop an effective description of state of the game.
For the payoff function g(x)=\sgn (x) we explicitly represent the game as the
Markov process and prove the finitness of number of states. We also demonstrate
boundedness of the utility function. Using these facts we can explain all
interesting observable features of the aggregated demand: appearance of strong
fluctuations, their periodicity and existence of prefered levels. For another
payoff, , the number of states is still finite and utility remains
bounded but the number of states cannot be reduced and probabilities of states
are not calculated. However, using properties of the utility and analysing the
game in terms of de Bruijn graphs, we can also explain distinct peaks of demand
and their frequencies
Market Coupling as the Universal Algorithm to Assess Zonal Divisions
Adopting a zonal structure of electricity market requires specification of
zones' borders. In this paper we use social welfare as the measure to assess
quality of various zonal divisions. The social welfare is calculated by Market
Coupling algorithm. The analyzed divisions are found by the usage of extended
Locational Marginal Prices (LMP) methodology presented in paper [1], which
takes into account variable weather conditions. The offered method of
assessment of a proposed division of market into zones is however not limited
to LMP approach but can evaluate the social welfare of divisions obtained by
any methodology.Comment: 5 page
Polish grid infrastructure for science and research
Structure, functionality, parameters and organization of the computing Grid
in Poland is described, mainly from the perspective of high-energy particle
physics community, currently its largest consumer and developer. It represents
distributed Tier-2 in the worldwide Grid infrastructure. It also provides
services and resources for data-intensive applications in other sciences.Comment: Proceeedings of IEEE Eurocon 2007, Warsaw, Poland, 9-12 Sep. 2007,
p.44
The Scheme of a Novel Methodology for Zonal Division Based on Power Transfer Distribution Factors
One of the methodologies that carry out the division of the electrical grid
into zones is based on the aggregation of nodes characterized by similar Power
Transfer Distribution Factors (PTDFs). Here, we point out that satisfactory
clustering algorithm should take into account two aspects. First, nodes of
similar impact on cross-border lines should be grouped together. Second,
cross-border power flows should be relatively insensitive to differences
between real and assumed Generation Shift Key matrices. We introduce a
theoretical basis of a novel clustering algorithm (BubbleClust) that fulfills
these requirements and we perform a case study to illustrate social welfare
consequences of the division.Comment: 7 page
The effect of pro-ecological procedures and insect foraging on the total content of phenol compounds in winter wheat
In laboratory conditions, the effect of pro-ecological procedures (application of effective microorganisms and Asahi SL biostimulator) and foraging by insects [cereal leaf beetle (Oulema melanopa L.) and bird cherry-oat aphid (Rhopalosiphum padi (L.)] on the total content of phenolic compounds in winter wheat, was studied. Correlations between the total content of phenolic compounds (determined by the Folin-Ciocalteau colorimetric method) expressed as the amount of pyrogallol in wheat plants: undamaged, damaged by O. melanopa, damaged by R. padi, the length of feeding scar left by cereal leaf beetle and the number of pricks made by actively feeding insects of bird cherry-oat aphid were analysed. The wheat was treated by EM inoculant and a biostimulator. The mode of application of the preparations used had a significant effect on level the total phenolic compounds in the undamaged wheat and the wheat exposed to foraging by the above-mentioned insects. The plants not exposed to insects foraging contained greater amounts of phenolic compounds than those exposed to the insects. The correlation between the total content of phenols in the wheat damaged by the insects in the ‘no-choice’ conditions, proved insignificant