Search

Your search keyword '"Jafari, Ali"' showing total 1,242 results
Start Over Author "Jafari, Ali"

Refine your results

more »

more »

more »

more »

more »
1,242 results on '"Jafari, Ali"'

4. Chapter Shapes and way of inhabiting the excavated architecture: knowledge and comparison of the cave dwellings in Bamyan and Matera

Author

Jafari, Ali Yaser and Calia, Marianna

Subjects
Transitions, Cross, Modulate, Develop, Drawing, Science of Representation, bic Book Industry Communication::A The arts::AM Architecture::AMC Architectural structure & design, bic Book Industry Communication::T Technology, engineering, agriculture::TB Technology: general issues::TBG Engineering graphics & technical drawing, bic Book Industry Communication::A The arts::AG Art treatments & subjects::AGZ Art techniques & principles
Abstract

The volume, dedicated to the 44th International Conference of the Italian Union for Drawing, investigates the theme of ‘Transitions’, which particularly effectively represents our time and the current condition of the discipline of Drawing. The term, beyond its generic meaning of an intermediate stage in a process in which a condition changes from one state to another, has always been used in various fields, from music to geophysics. In fact, the disciplines of drawing have always been confronted with themes and issues relating to transitions from one condition to another. The history of representation tells us of transformations, even epochal ones, relating to ‘drawing’, with all that such transitions entail: suffice it to think of the evolution of forms of representation, of instrumental apparatuses, of the mutability of supports, of the analogical-digital transition underway, of the new modes of communication on platforms, of the hypertrophic offer of images also on the net that confirms Guy Debord’s intuitions relating to the new spectacularisation of society. Similarly, representation triggers transitions in the prefiguration and communication of design, the anticipation and foreshadowing of future events.The challenges posed by the digital pose open questions whose scope can only be glimpsed, such as the relationship between drawing and the act of modelling, and the construction of new paradigms of visual language and communication. ‘Transitions’, almost implicitly, points to possible futures, the evolution of technique and the search for new modes of expression; at the same time, however, it can suggest silences and reflections in a process of connection between history, theory, criticism and construction.

Published
2023
Full Text
View/download PDF

5. Social Recommendation through Heterogeneous Graph Modeling of the Long-term and Short-term Preference Defined by Dynamic Periods

Author

Jafari, Behafarid Mohammad, Luo, Xiao, and Jafari, Ali

Subjects
Computer Science - Social and Information Networks, Computer Science - Artificial Intelligence, Computer Science - Computational Engineering, Finance, and Science
Abstract

Social recommendations have been widely adopted in substantial domains. Recently, graph neural networks (GNN) have been employed in recommender systems due to their success in graph representation learning. However, dealing with the dynamic property of social network data is a challenge. This research presents a novel method that provides social recommendations by incorporating the dynamic property of social network data in a heterogeneous graph. The model aims to capture user preference over time without going through the complexities of a dynamic graph by adding period nodes to define users' long-term and short-term preferences and aggregating assigned edge weights. The model is applied to real-world data to argue its superior performance. Promising results demonstrate the effectiveness of this model.

Published
2023

12. Comparison of Ardabil People's Utilization of National Media and Satellite Networks in Receiving News

Author

Baratchian, Taher, Hashemi, Shahnaz, Jafari, Ali, and Far, Mohammad Soltani

Abstract

Virtual social networks nowadays play a very important role in getting and receiving daily news. Therefore, it is necessary to know the extent and reasons for users to use this tool and compare it with other media. Therefore, it is essential to know the extent and reasons for users to utilize this tool and compare it with other media. This study aimed to investigate the comparison of the use of Ardebil people from social networks and other media in receiving the news. In this descriptive-inferential study 400 Ardabil people were randomly selected. The validity and reliability of the questionnaire developed by the researcher were obtained and completed by the participants. The data were then analyzed using SPSS software. Research findings show that participants prefer to gain news from social networks to other media and most of them think that using social media has been able to reduce the utilization of other media. The findings show that the use of social media in news coverage has somewhat reduced the amount of time spent watching television and satellite. The reasons for this media shift in news acquisition include the social networking content attractiveness in the indicators of accuracy and transparency, the speed of dissemination, the neutrality of news, the latest visual reports, the visual and auditory attractions, the attention to quality of programs, attention to Respondents cited low censorship, addressing issues of interest to audiences, using news images, and using expert view of other media as sources of news. The participants also believed that social networks have a low level of censorship and news silence. Since the national media should be the most important medium in getting the news to a community, as an emerging media social networks have been able to take deep root in human life. These networks have positive features, but on the other hand, they have problems that need special attention.

Published
2020

16. Epigenetic regulation of hepatocellular carcinoma progression: MicroRNAs as therapeutic, diagnostic and prognostic factors

Author

Hashemi, Mehrdad, Daneii, Pouria, Asadalizadeh, Mahya, Tabari, Kiana, Matinahmadi, Arash, Bidoki, Seyed Shahabadin, Motlagh, Yasamin Sadat Mousavi, Jafari, Ali Moghadas, Ghorbani, Amin, Dehghanpour, Amir, Nabavi, Noushin, Tan, Shing Cheng, Rashidi, Mohsen, Taheriazam, Afshin, Entezari, Maliheh, and Goharrizi, Mohammad Ali Sheikh Beig

Published
2024
Full Text
View/download PDF

26. A New Look to Three-Factor Fama-French Regression Model using Sample Innovations

Author

Shaabani, Javad and Jafari, Ali Akbar

Subjects
Quantitative Finance - Statistical Finance, Statistics - Applications
Abstract

The Fama-French model is widely used in assessing the portfolio's performance compared to market returns. In Fama-French models, all factors are time-series data. The cross-sectional data are slightly different from the time series data. A distinct problem with time-series regressions is that R-squared in time series regressions is usually very high, especially compared with typical R-squared for cross-sectional data. The high value of R-squared may cause misinterpretation that the regression model fits the observed data well, and the variance in the dependent variable is explained well by the independent variables. Thus, to do regression analysis, and overcome with the serial dependence and volatility clustering, we use standard econometrics time series models to derive sample innovations. In this study, we revisit and validate the Fama-French models in two different ways: using the factors and asset returns in the Fama-French model and considering the sample innovations in the Fama-French model instead of studying the factors. Comparing the two methods considered in this study, we suggest the Fama-French model should be considered with heavy tail distributions as the tail behavior is relevant in Fama-French models, including financial data, and the QQ plot does not validate that the choice of the normal distribution as the theoretical distribution for the noise in the model.

Published
2020

37. Comparing Two Approaches in Heteroscedastic Regression Models

Author

Jafari, Ali Akbar

Subjects
Statistics - Methodology
Abstract

Recently, a generalized test approach is proposed by Sadooghi-alvandi et al. (2016) and a fiducial approach is proposed by Xu and Li (2018) to test the equality of coefficients in several regression models with unequal variances. In this paper, it is shown that the considered quantities in these approaches are identically distributed and therefore, these approaches are same. Also, this result satisfies for the one-way ANOVA problem.

Published
2018

39. Epidemiology of Brain and Other Central Nervous System Cancers in the North Africa and Middle East Region: A Systematic Analysis of the Global Burden of Disease Study 1990–2019

Author

Mohammadi, Esmaeil, Moghaddam, Sahar Saeedi, Azadnajafabad, Sina, Maroufi, Seyed Farzad, Rashidi, Mohammad-Mahdi, Naderian, Mohammadreza, Jafari, Ali, Sharifi, Guive, Ghasemi, Erfan, Rezaei, Nazila, Malekpour, Mohammad-Reza, Kompani, Farzad, Rezaei, Negar, Larijani, Bagher, and Farzadfar, Farshad

Published
2023
Full Text
View/download PDF

40. Targeting the Receptor Complexes by Structure-based Natural Drug Compounds in Seizures: A New Dimension in Drug Discovery and Design

Author

Aleebrahim-Dehkordi, Elahe, primary, Jafari, Ali, additional, Bala, Auwal Adam, additional, Lagzian, Ahmadreza, additional, Ghoshouni, Hamed, additional, Koochaki, Pooneh, additional, Faal Hamedanchi, Neda, additional, Azadeh-Ghahfaroghi, Sayedeh Zohreh, additional, Azadikhah, Fariba, additional, Taei, Nafiseh, additional, Valizadeh, Sahar, additional, Saberianpour, Shirin, additional, and Zalpoor, Hamidreza, additional

Published
2024
Full Text
View/download PDF

50. Small Sample Inference for the Common Coefficient of Variation

Author

Kazemi, Mohmammad Reza and Jafari, Ali Akbar

Subjects
Statistics - Computation
Abstract

This paper utilizes the modified signed log-likelihood ratio method for the problem of inference about the common coefficient of variation in several independent normal populations. This method is applicable for both the problem of hypothesis testing and constructing a confidence interval for this parameter. Simulation studies show that the coverage probability of this proposed approach is close to the confidence coefficient. Also, its expected length is smaller than expected lengths of other competing approaches. In fact, the proposed approach is very satisfactory regardless of the number of populations and the different values of the common coefficient of variation even for very small sample size. Finally, we illustrate the proposed method using two real data sets.

Published
2017

Catalog

Books, media, physical & digital resources
See catalog results