فهرست مطالب mostafa amini

Every year, a significant portion of the country's credits and financial resources are allocated to investment in civil and infrastructural projects. Risk management can prevent cost escalation and assist in completing projects within the designated time and budget. This study aims to identify factors contributing to the lack of implementation of risk management in small-scale civil projects in the city of Abadan. The research utilizes a descriptive method for data collection and employs exploratory factor analysis and TOPSIS analytical methods to identify and prioritize the factors. The results indicate that the influential factors in the lack of implementing risk management include four main elements (technical risk barriers, project management and leadership obstacles, construction risk barriers, financial risk barriers), among which the option of insufficient knowledge of the contractor has priority over other options.

The main purpose of this research is to review and Redefine about data-driven business according to data-driven economies features in order to help policymakers in the domains of ICT Industry, Entrepreneurship, Iran Digital Economy and Iran Digital Ecosystems.

This paper is a kind of Narrative literature review in which the documentary technique is used.

In this study, a new definition of data-driven Business is presented based on eight principles from previous studies.

The researchers believe that the result of the text can be exploited in the following ways: Supreme Council of Cyberspace, in particular the efforts of content, technology and regulation departments , the Vice President of Science and Technology of the Presidency of the Islamic Republic of Iran, in particular the efforts of policy, innovation and commercialization departments, the project of Iran Big Data Roadmapping with a code of 904550100 at the Communication and Information Technology Research Institute in and Data Governance Program of the Ministry of Science, Research and Technology.

Let $R$ be an associative ring and let $n$ be a non-negative integer‎. ‎In this paper‎, ‎we consider $n$-super finitely presented‎, ‎Gorenstein $n$-weak injective and Gorenstein $n$-weak flat modules under change of rings‎. For‎ ‎an excellent extension‎ $S\geq R$, ‎w‎e show ‎that the Gorenstein $n$-super finitely presented dimensions (resp‎. ‎weak Gorenstein $n$-super finitely presented dimensions) of rings $R$ and $S$ coincide‎.

The aim of the current research is to study and compare graphs authorship by Iranian researchers in Persian scientific research journals in the field of educational sciences by using algebraic parameters of mathematics. In this research, the data related to the scientific research documents of 336 Iranian researchers from 6 Persian scientific research journals in the field of educational sciences from 2017 to 2021 were extracted by using the issues printed in these journals and the graphs related to the authors of these journals have been drawn by mathematical methods and software, and then compared and analyzed by using algebraic parameters such as the average degrees of vertices, independence, color and matching numbers. In the main results, it was checked that the average grade of the Journal of the Educational Measurement and Evaluation Studies is 4.4 and higher than other journals. Also, the largest research group (cluster number) is 6 people, and the most research diversity (independence number) is 29 and it is related to of the Journal of the teaching research. Among the discussed journals in the field of educational sciences, according to the average grades, the amount of research cooperation of the Journal of Educational Measurement and Evaluation Studies is at a higher level than the other five journals.

The purpose of this study is to answer the main question of what is meant by the concept of data-driven digital transformation from the perspective of cyber-physical-social systems’ thinking.
Comparative Evaluation method is used in this study. In this method, after identifying different definitions and interpretations of the digital data-driven transformation and also cyber-physical-social data, these definitions are compared based on this method. Based on this analysis, then a conceptual concept from the perspective of the notion of cyber-physical-social systems for the concept of data-driven digital transformation is proposed.
Based on this research, the concept of digital transformation has different definitions and interpretations. Some of these definitions focus on “what” and some on “how”. But the complex nature of the concept of transformation has not been noted enough. Now we’re cyber-physical-social systems as a platform for data creation and data flow. The nature of these systems is based on transformation and the digital data-driven transformation is achieved by data flow management in these systems.
Digital data-driven transformation is a concept based on digital convergence between social, physical, cognitive, and cyber systems. These systems are the context of creating big data, and data flow management requires data-driven notions and analytics, which is essential for the transformation and sustainability of societies.
According to the proposed framework, data-driven digital transformation is a concept based on digital convergence between social, physical, cognitive, and cyber systems. These systems are the context of creating big data, and data flow management requires data thinking and analytics which are necessary for the transformation and sustainability of societies.

In this study, we assessed the prevalence of positive rapid detection test (RDT) among healthcare workers (HCWs) and evaluated the role of personal protective equipment (PPE) and knowledge of the pandemic.

In a cross-sectional study conducted between August 2020 and October 2020 in a tertiary referral center (Tehran, Iran), we enrolled 117 physicians, nurses, and other HCWs (OHCWs)—aides, helpers, and medical waste handlers—regularly working in coronavirus disease 2019 (COVID-19) wards. The RDT kit was utilized to reveal recent infection; data on demographics, PPE use and availability, and knowledge of the pandemic was collected through pre-defined questionnaires.

Overall, 24.8% (95% CI: 16.8–32.7%) of HCWs had positive RDTs. The more PPE was available and used, the less the chance of positive RDT was (OR: 0.63 [0.44–0.91], P = 0.014 and 0.63 [0.41–0.96], P = 0.030). The same was true for the knowledge of prevention and adhering to preventive rules (OR: 0.44 [0.24–0.81], P = 0.008 and 0.47 [0.25–0.89], P = 0.020). OHCWs had the highest prevalence of positive RDT, while they had more shifts per month, less accessibility to PPE, and less knowledge of the pandemic than physicians.

The findings of this study suggest that HCWs should have a thorough knowledge of the pandemic along with using PPE properly and rationally. Furthermore, adhering to preventive regulations plays a crucial role in HCWs’ safety. It is also noteworthy that shifts should be arranged logically to manage exposures, with a special attention being paid to OHCWs.

The purpose of this research was to improve the five steps of Schallmo's methodology for digital transformation of business models, using Schumacher’s digital maturity assessment model, three approaches to business model transformation based on Heikkilä's recommendations and to improve digital innovation approach. The business model changes are based on Stampfl’s recommendations.

This research has a combined methodology which consists of a validity review study method and action research method in a manufacturing SME. This improved methodology has been used in strategic planning for the digital transformation of the business model of one of Iran's manufacturing companies.

After reviewing the various documents of the Schallmo’s five-step framework, it was improved by Schumacher's maturity model for industry 4.0, approaches of business model transformation recommended by Heikkilä et al. and various types of business model innovation as described by Stampfl. Then the improved framework was used to map the target state of company's digital transformation.

Since the proposed model of this research, in addition to improving the Schallmo model, has been implemented in a real company, so it seems that it can be used by Digital transformation planning and digital operating models as well as change managers and consultants.

Numerical models are feasible approach against field studies which are capable of estimating of materials behavior appropriately if material properties are considered exactly. Numerical models are categorized in three sets: Micro, meso and Macro scale. In macro scale, the whole concrete is considered as a one phase material and usually the interaction between concrete-steel is just modeled. In Micro Scale Modelling, the cement-aggregate crystals are evaluated. The other preference of meso scale numerical model is the ability of presenting different phases interaction in multi phase materials such as concrete. This feature is useful in high rate dynamic load such as explosion. To perform meso scale modeling, different random specimens with different contents of aggregates must be produced. In different studies, a unique pattern which could generate real aggregation is not used. Aggregates generated in this study are elliptical, and by controlling the lack of interference with each other, aggregates are randomly assigned into the defined template boundaries. Then, in the next step, the specimen is meshed by choosing dimensions of elements in cubic form. Finally, the prototype is transformed into the input text file of the numerical analysis programs. The comparison between produced aggregate curve and real cure shows good agreement.

During the Fourth Industrial Revolution, knowledge, along with data, as an intangible asset, found an important place in modern organizations. The best and most effective application of organizational knowledge in an organized, managed and integrated way in the organizational culture, creates significant economic, social and cultural progress in the organization. The flow of knowledge is invisible, but the effectiveness of the knowledge management process strongly depends on its continuous flow, and this is defined as a process of knowledge transfer between individuals or as a mechanism of knowledge processing. Failure to use knowledge flow platforms creates barriers that cause temporary constraints, lack of motivation and awareness among employees, and insufficient coordination between departments, and imposes heavy costs on the organization. Knowledge flow management seeks more to establish knowledge communication between people working in an organization; Teach methods of using organizational knowledge; Provide the basis for the transformation of personal knowledge into collective knowledge and vice versa, and ultimately strengthen innovation and creativity. In this regard, this paper seeks to promote the advance transfer of knowledge in modern organizations by providing a conceptual model for a new approach to knowledge flow management called knowledge logistics.

Diabetes is related with the higher blood levels of liver enzymes and inflammatory factors.  Galega officinalis is used as a medicinal plant for treatment of diabetes traditionally. In this work, silver nanoparticles (Ag-NPs) were synthesized with green method using Galega officinalis extract. The synthesized green Ag-NPs were characterized completely. Intact or diabetic rats receieved intraperitoneal injection of saline or 2/5mg/Kg  green synthesized Ag-NPs. Mean serum levels of glucose,  hepatic enzymes and hematological parameter were determined. Gene expression of tumor necrotic factor alpha (TNF-α) was done by real-time PCR.   Synthesis of green synthesized Ag-NPs was confirmed by FT-IR, XRD and UV-vis analyses. The FESEM and TEM images showed spherical Ag-NPs with size of 25 nm. The hypoglycemic influence of Ag-NPs using Galega officinalis extract is reported for the first time in this study. Blood concentration of liver enzymes, urea, glucose, white blood cells count and TNF-α mRNA levels in visceral adipose tissue significantly declined in diabetic rats receiving Ag-NPs. The synthesized Ag-NPs using Galega officinalis extract may improve complication of diabetes via preventing liver hepatocyte damage and reducing inflammatory factors.

University-industry cooperation is a global challenge and countries have tried to solve this challenge in various ways. Therefore, the study of global experiences can guide the country in choosing the right path of university cooperation with industry. The United States is one of the countries that has tried to solve this challenge by advancing strategies and improving the university-industry relationship. Important steps by the United States to increase cooperation between academia and industry include the passage of the Bayh-Dole Act, the Technology Transfer Act, the allocation of tax exemptions for research and development at the university, the reduction of the federal budget and the establishment of intermediaries for its allocation and unlimited royalties. It is an invention.

The Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) epidemic broke out in December 2019 and is now characterized as a pandemic. Effective control of this infectious disease requires access to diagnostic techniques, for both case finding and epidemic size estimation. The molecular technique is routinely used worldwide. Although it is the “standard” case detection and management method, it has its own shortcomings. Thus, some easy-to-use rapid serological tests have been developed.

One hundred and fourteen positive RT-PCR-diagnosed patients were tested by VivaDiag Kit, a brand of rapid serological kits available in hospitals affiliated to Tehran University of Medical Sciences (TUMS), Tehran, Iran. Frozen serum specimens taken from healthy people in summer and fall 2019 were also tested as negative controls.

Test sensitivity was 47.9% (95% confidence interval [CI]: 38.8-56.9) for IgM and 47.0% (95% CI: 38.0–56.0) for IgG. There was no difference between IgG and IgM seropositivity except in one case. Specificity was calculated as 99.0% (95% CI: 96.4–99.9) for IgM and of 100.0% (95% CI: 0.98.2–100.0) for IgG. Sensitivity was higher in men and older participants.

This test can be used for epidemiological investigations, especially for the estimation of the level of infection in the community, after it is properly corrected for sensitivity and specificity. The low sensitivity could be attributed to the technical limitations of the kit or low levels of antibodies after infection. The different sensitivity in age and sex groups supports the hypothesis that different people show different immune responses to this virus

The aim of research is to comprehensively investigate various types of Data-Driven Business Patterns in order to help entrepreneurship and innovation actors, especially digital businesses efforts.This paper is a critical-argumentative study using a narrative review with a documentary approach. In order to collect and extract information, a comprehensive search was carried out on documents in the Iranian, international scientific journals databases and some of the most famous management consulting groups in the world. The statistical population of this study was all documents related to the keyword Data-Driven Business Model in the period 2000 to 2018.After studying documents, in the literature section, 26 patterns of Data-Driven Business Model were indexed. After analyzing similarities, 20 patterns were counted. In the second review of these cases, 13 different patterns were identified, and in the third review period, the necessity of the need for these 13 patterns was identified by 5 complementary tools. Data-driven business model patterns can help innovators and entrepreneurs utilize the patterns in proportion to their customer groups or even think of the worldchr('39')s most successful businesses using these patterns. In this study, for the first time, all types of data-driven business models were collected from different perspectives. If companies want to actually use these patterns, they should also be equipped with a set of complementary tools. Major complementary tools play a role in data ethics, identification of data stakeholders, and business-data alignment.

Combat readiness in a heterogeneous environment based on environments and areas, which is one of the conditions of future wars, requires a trained person, and in particular a combat force after undergoing special training based on special environments must be able and ready to perform combat in the future. Therefore, the design and implementation of desert combat camps has a significant role in training forces. On the other hand, the implementation of these camps should be the most effective in all areas, and based on the university as a large educational center, research was conducted on holding desert combat camps in conditions of heterogeneous battle with a case study of a training center. The main purpose of this study was to investigate the effect of tactics and equipment that are heterogeneous in battle conditions and according to the type of applied research, and the research method is descriptive survey with a statistical population of 95 people and descriptive statistics and inferential statistics were used to analyze the data. In the end, after analysis, 4.6902 equipment is in the first priority and tactical field is in the next priority with an average of 4.6379. Therefore, to reduce vulnerability in heterogeneous combat-based execution, careful planning, proper use of land, and training and practice of tactical moves in combat in the field of tactics, as well as light and standard boots and backpacks suitable for manpower, a sleeping bag suitable for the weather is recommended.

The objective of this research is to study and compare the co-authorship graphs (networks) of Iranian researchers in the main fields of mathematics by using records, extracted from WOS and Google Scholar, and graph parameters.

The co-authorship graphs (networks) of Iranian researchers in 6 specialty fields of mathematics have been drawn by mathematical methods and software. Overall this research, 276 Iranian researchers in mathematics were considered and the co-authorship graphs in all fields were drawn and compared. Some mathematical graph parameters such as degrees of vertices, diameter, radius, independence number, vertex and edge chromatic numbers, matching number, for all co-authorship graphs were calculated too.  Finally, we analyze and compare the co-authorship graphs by using these graph parameters.

The research findings showed that two specialty fields Operation Research and Graphs and Combinatorics with average degrees 4.20 and 3.70, respectively, have high research collaboration with respect to other fields. The greatest diameter in the co-authorship graph, which equals 8, belongs to Commutative Algebra and the co-authorship graphs of the specialty field Numerical Analysis and Group Theory have the same least value of radius 3.

 In some specialty fields of mathematics, which are pure, there is not enough collaboration among Iranian researchers. So, it is better that these researchers try to have more collaboration to publish stronger and deeper research works in the international journals. For this aim, more budget allocations should be considered to accelerate researchers to do group works with high quality.

Despite constant decrease in rate of neonatal mortality, the rate is still higher than that of other under-five children. One of the first steps towards reduction of neonatal mortality is to identify its determi-nants using health production function. The aim of the present study was to estimate neonatal health produc-tion function for Iran. In this cross-sectional study, Iranian Multiple Indicator Demographic and Health Survey (Ir-MIDHS) 2010 was used. Four categories of socioeconomic, mother, neonatal demographic and healthcare sys-tem factors were entered into the Binomial Logistic Regression model to estimate neonate health production function. Households’ economic status was constructed using principal component analysis. History of abortion/stillbirth had the highest significant positive impact on odds of neonatal mortali-ty (odds ratio=1.98; 95 % CI=1.55-2.75), indicating that neonates of mothers with such a history had 1.98 times higher chance of death compared to other neonates. Moreover, odds ratio of neonatal death for the poorest quintiles was 1.70 (95 % CI=1.08-2.74), indicating that by moving from the poorest quintile to the richest one, the odds of being alive for neonates increased up to 70%. However, skilled birth attendant de-creased the chance of death up to 58% (odds ratio=0.58; 95 % CI=0.36-0.93). Considering the most significant inputs of neonatal health production function in Iran, im-provement of economic status of households, provision of appropriate care services for mothers, and im-provement of delivery care provided by trained personnel, could be priorities for health policymakers to act and reduce neonatal mortality in Iran.

Soil erosion is one of the hazards with on-site and off-site effects that gradually cause decreasing soil quality, land degradation, surface water contaminations, reduction of dam’s reservoirs capacity and threating of human food security. The soil loss due to crop harvesting (SLCH) has been considered less comparing the soil erosion types by researches. The objective of this study is therefore to estimate the Potato soil loss due to crop harvesting in the Ghorveh-Dehgolan plain, Kurdestan province. In view of this, 20 samples of potato with weight of 5 kg were collected from dry land and irrigated cultivated lands in the study area. In the laboratory, after washing the samples, the suspensions were filtrated and the remained soils on filter paper were dried and the SLCH determined. The results showed that the SLCH ranged 13.4 to 40.4 g kg-1. The results of one-way ANOVA showed that there is significance difference between SLCH from dry land farming and irrigating cultivation with the confidence level of 95%. The results of cluster analysis also indicated the weak relationships between samples collected from both land use types. The soil loss due to potato harvesting from 80490.4 ha in ten last years was 72374.52 Mg with annual average of 7237 Mg yr-1. Also, the mean soil erosion due to potato harvesting ranged from 0.66 to 1.14 Mg ha-1 harvest-1. The results of this study demonstrated that the soil losses caused by crop harvesting can be of the same order of magnitude as soil losses caused by water erosion processes that should be considered by researchers and planners in soil erosion control and conservation fields.

The main objective of this study was to determine the contribution of sub-basin sediment yield using geochemical and radionuclide tracers in Ashan drainage basin. In view of this, 30 sediment samples were collected from 5 sub basin outlets and radionuclide tracers including 210Pb, 228AC, 226Ra, 137Cs and 40K and geochemical traces including calcium, iron, potassium, magnesium, Mn, Na and organic carbon were measured. The optimum set of tracers was determined using Kruskal Wallis test and discriminant function analysis. The relative contribution of sub-basin sediment yield was determined by using Bayesian uncertainty un-mixing model based on the optimum set of tracers. The tracers including 226Ra, 137Cs and 40K, Mn and Ca were selected as optimum set of tracers with 80% correction of determination. The results showed that the sub basin of Heris (3) has the highest amount of sediment yield (70.1 %). The most lithology of this sub basin is pyroclastic and clay stones and soil conservation plans in order to reduce sediment yield should be focused on this sub-basin.

Each science has a historical origin, mode of attitude, and a developmental course throughout history and all sciences are affected by environmental conditions, concept and scientific paradigms. For this reason, the study of scientific schools and paradigms throughout history and their effects on a particular discipline helps to clarify the identity of that discipline and helps researchers to understand the scientific discipline, the necessity of existence, goals and methods of research. Geomorphology, as an independent science discipline, has not been affected and has influenced the historical approaches. For this reason, it is necessary to study the schools and paradigms affecting the geomorphology field and the development of different approaches in this field in order to properly understand this field of science. The main method of this research is library-analytical and it has been tried to explain their historical connection with geomorphology while describing the schools and paradigms.

Salt domes have high impact on the ground waters, mineral matters and their soil quality of lowland regions due to penetrating of them in to the saline mass and going up to surface of earth. In this process, remarkable rate of salt going up to surface of earth and entered to lowland regions by the way of various erosional factors and effect on the soil quality. This research aims to investigate the impact of salty dome of Korsia on the soil quality of lowland regions. For this, research region divided in four regions with regarding to their land uses and their distance from salt dome and 22 samples was gathered from these regions. Ions of Mg, N, K, Na, Ca and as well as volume of PH and EC and soil texture of samples of 2010 was measured and variables of 1993 such as Na, Ca, SAR, EC, pH was purchased from ministry of agriculture and significant differences in the various land uses, change rates of this elements in the land uses during in two periods of time, identifying of effective component in the soil quality and classifying of chemical elements was determined by land uses using multivariate statistical techniques such as variance analysis, independent T test, factor analysis and cluster analysis respectively. Results showed that all variables excepts K, Mn, pH.

Citizens, in interact with the community, learn thinking and negotiating power to protect their rights and teach others. Based on this principle, we have a strong need to communication and social interaction and neighborhood sites that prevent citizens from being so isolated.. The vital role of public spaces is the ability to facilitate human relationships with one another. In cities, Public spaces are to shape and define the concept of citizenship. In a sense, we can say that the motion in to cities is partly due to the existence of public spaces. This move is a kind of element of citizenship dynamic. In this condition, the citizens mind and think free, affected and can be tailored to interests they think and act. Unlike this case, without the spirit of the open public spaces, citizens are bored to a leisure brought within to house. In the absence of such a space in our cities that still the concept of citizenship for civil society remains as a vague concept and exotic. Because our people are not accustomed that to the absence of public spaces and to see freedom within their homes only. The result is Neutral and indifferent citizens who do not have any reaction to the fate of the city and its community. The arbanarea without enough public space, for children, adolescents and the youth in the neighborhood, should not be expected thto have, in future of citizens committed and caring and active people in the density of the city and the community.. Metodology in this research is descriptive - analytical and for mapping uses GIS software, data collection are conducted based on the field and library studies. The results of this research through a neighborhood of Tehran Gheitarieh case study outlining the desirable position of the neighborhood Janduse indicates that If we want to have healthy and lively cities, citizens should be and sensitive to themselves and community, planned with the voluntary participation of people and finally a strong civil society inevitably need to strengthen their public spaces in cities so that the citizens of the famous "Four optional wall" should be provided with the public spaces.