problems about polyominoes have been discussed. \Ve introduce new one: Determine the smallest size fen) of cut-set C(n) of n-ominoes, such that every sufficiently polyomino contains at one n-omino C(n) a partial polyomino. This question may be of interest in biology or pharmacy, for ex:arrlpl IC, if every infinite cell of polyominoes can be avoided the control of all nominoes for fixed n then i...

This paper presents a novel approach that automatically assesses student class performance by analyzing keyword density in online class messages. Class performance of students is evaluated from three perspectives: the quality of their course work, the quantity of their efforts, and the activeness of their participation; three measures keyword density, message length, and message count, are deri...

The Central Bank of Iran banned online currency trading through Forex brokers in November 2016. However, some Iranian speculators still trade in the online Forex market. Is this prohibition on Forex trading reasonable? According to reports, the majority of Forex day traders fail and leave the market within six months to a year. Some scholars attribute this failure to the changeable characterist...

We propose minimum risk training for end-to-end neural machine translation. Unlike conventional maximum likelihood estimation, minimum risk training is capable of optimizing model parameters directly with respect to evaluation metrics. Experiments on Chinese-English and EnglishFrench translation show that our approach achieves significant improvements over maximum likelihood estimation on a sta...

existence of heavy minerals in waters in some regions causes serious environmental pollution and affects the soil and water resources quality. soil and waters sensitive to pollutants were investigated in this research, based on the degree of sensitivity of their parameters. the samples obtained from industrial and agricultural areas for identifying water tables at higher risk and display region...

We develop a model to predict optimal diet selection when energy intake varies over consecutive foraging periods. The model assumes that fitness is maximized when the forager maximizes its net reproduction (survivorship x reproduction) over some specified time period. This goal differs from earlier risk-sensitive foraging models which assume that the forager minimizes the risk of failing to sat...