sh. sedghi

Let G(V;E) be a graph. The common neighborhood graph (congraph) of G is a graph with vertex set V , in which two vertices are adjacent if and only if they have a common neighbor in G. In this paper, we obtain characteristics of congraphs under graph operations; Graph :::::union:::::, Graph cartesian product, Graph tensor product, and Graph join, and relations between Cayley graphs and its congraphs.

In this paper, we prove a general fixed point theorem in $textrm{S}$-metric spaces for maps satisfying an implicit relation on complete metric spaces. As applications, we get many analogues of fixed point theorems in metric spaces for $textrm{S}$-metric spaces.

For new scientific field to achieve more coherent position, it needs scientometric analysis more than other fields. This study aims to use citation analysis and scientific mapping of Iranian researcher's publications in stem cell indexed in science citation database up to 2015
This is an applied descriptive study using scientific mapping method. The population of this study is all types of Iranian researcher's publications in stem cell (2317 records) indexed in science citation database up to 2015. The data have been collected by observing the science citation index website and transcribing in to plain text in order to analyze it with HistCite software.
The results showed that Soleimani with 232 records (10 percent) achieved the first place in author's ranking. In universities ranking Tehran University of medical sciences was the first, which published 566 records (24.5 percent) in the field of stem cell. This university also achieved high global and local citation score among the universities and institutions in Iran. The scientific publication growth procedure of this field increased up to 2014 but it had a little bit decrease from 2014 to 2015. The type of 1762 records (76 percent) of stem cell publication was article. The scientific map of stem cell based on both global and local citation score had two important clusters.
The most important and cited articles on stem cell clusters have focused on the role of this field in treatments and pathogens diagnosis. According to the Tehran University of medical sciences top rank in this field, the scientific cooperation between the scientists and students of this university and the other universities and institutions is improving the scientific level of stem cell in Iran.

In this paper is introduced a new type of generalization of metric spaces called $S_b$ metric space. For this new kind of spaces it has been proved a common fixed point theorem for four mappings which satisfy generalized contractive condition. We also present example to confirm our theorem.

Commonly libraries and information centers use LibQual to measure their quality of services. Although analysis of Libqual done with classical statistics، it is possible to analyze it through Artificial Neural Network with lower error rate. This research try to introduce an Artificial Neural Network that is able to predict s ervice quality of university library.

In this applied cross-sectional study، all of Shiraz university of medical science students were assessed. LibQual questionnaire was the instrument of data collection and MATLAB software was being used to analyze data. In addition an algorithm was written to automatic selection of the best network architecture based on lower error rate and higher adaptation rate.

for 5 categories of input data and with running of the written algorithm، 5 ANN was created and their matching ratio is 0. 77059، 0. 6828، 0. 81089، 0. 79161 and 0. 83273 respectively.

By comparing the ANNs، it was found that ANN with 20 hidden layer، %80 training data، %16. 667 testing data and %3. 3333 validation data that be fed with fifth input data، is the most appropriate ANN in quality evaluation of university libraries.

Webometrics ranking shows the amount of scientific and educational activities of universities and organizations annually. This study was an attempt to rank medical universities in Iran via three search engines.

This applied- descriptive study used webometric methods to survey 43 websites of medical universities in Iran. The three indexes of size، visibility and rich files were taken into consideration by three search engines. Data were analyzed with SPSS 16.

The results showed that the indexed page size of Tehran University of Medical Sciences enjoyed the highest frequency in the three search engines. Moreover، the lowest ranks belonged to Dezfoul، Jiroft and Yasouj. Concerning foreign links، Tehran University of Medical Sciences gained the rank of 13 and Hormozgan with an average of 23. 11 was in the upper ranks، but it was reported to have the rank of 26 regarding indexed page size.

The findings showed that even the eight high-ranked medical universities did not appear to receive favourable number of links and visitors from other websites. This suggests the low effect of medical universities on the Web in spite of their relatively high page size.

In this paper, by using of C ∗ -algebra we give a metric with range in positive unit ball of a C ∗ -algebra. Indeed this is a generalization of a fuzzy metric space. Some definitions of compatible mappings of types (I) and (II) are introduced and some fixed and common fixed point theorems are proved.