the purpose of resent research is to analysis and compares performance evaluation models of selected investment companies in tehran stock exchange market in the field of their portfolio management. the duration of research was between years 2009-2014. statistical society the research is consisting of all active investment companies in in tehran stock exchange market which were 30 companies. vol...

background: gray`s reinforcement sensitivity theory (rst) presupposes individual differences in the sensitivity of basic brain systems that respond to punishing and reinforcing stimuli. these differences are thought to underlie the personality dimensions of anxiety and impulsivity, and to have relevance for psychopathology. the present study aims at studying the relationship between behavioural...

The OK-quantization theory determines the minimum gray level by using the reproducibility of an image histogram. In many cases, it is ascertained by the human sense of sight that the minimum gray level obtained from this theory is appropriate. However, in order to put the OK-quantization theory into practical use, it is necessary to perform a validity evaluation of this theorem using a computer...

An investigation of the friction and sliding wear of gray cast iron against chromium plated cast irons was carried out on a newly constructed reciprocating friction and wear tester. The tests were the first to be done on the test rig under dry conditions and at the speed of 170 cm/min, and variable loads of 20-260 N for a duration of 15 min. to 3 hours. The gray cast iron surfaces worn by a pro...

The intelligence and automation of image processing and analysis is a bottle problem for photogrammetry and remote sensing. Artificial neural networks is a new solver which imitates brain and gray system theory is a new tool which handles undetermined problem. This paper describe how to combine artificial neural networks with gray system theory to realize classification of remote sensing image ...

This paper continues the development of a simplicial theory of weak ω-categories, by studying categories which are enriched in weak complicial sets. These complicial Gray-categories generalise both the Kan complex enriched categories of homotopy theory and the 3-categorical Gray-categories of weak 3-category theory. We derive a simplicial nerve construction, which is closely related to Cordier ...