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Issue Info: 
  • Year: 

    2014
  • Volume: 

    5
Measures: 
  • Views: 

    225
  • Downloads: 

    80
Abstract: 

IN MOST STRUCTURAL SOFTWARES, THE DESIGN PARAMETERS ARE DEFINED AS DETERMINISTIC PARAMETERS SO, THE OBTAINED FREQUENCIES ARE DETERMINISTIC BUT NOT RELIABLE. FOR UNDERSTANDING THE OUTPUT FREQUENCY’S ACCURACY OBTAINED FROM A SOFTWARE, THE PROBABILITY DISTRIBUTION OF FREQUENCY IS NEEDED WHICH IS HERE THE CASE. IN THIS WORK, THE PROBABILITY DISTRIBUTION OF FREQUENCY IS DERIVED BY MONTE CARLO SIMULATION. TO REDUCE THE COMPUTATIONAL TIME, THE NATURAL FREQUENCIES ARE EVALUATED USING TWO METHODS: (1) A LINEAR REGRESSION MODEL, (2) AN EFFICIENT ALGORITHM WITH FIRST AND SECOND ORDER APPROXIMATIONS. FINALLY THE PAPER, THE EFFICIENCY OF THE PROPOSED METHODS IS DISCUSSED THROUGH AN ILLUSTRATIVE EXAMPLE.

Yearly Impact:   مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

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Author(s): 

TARASHEV N.

Issue Info: 
  • Year: 

    2010
  • Volume: 

    34
  • Issue: 

    9
  • Pages: 

    2065-2076
Measures: 
  • Citations: 

    1
  • Views: 

    115
  • Downloads: 

    0
Keywords: 
Abstract: 

Yearly Impact: مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

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Issue Info: 
  • Year: 

    2025
  • Volume: 

    14
  • Issue: 

    1
  • Pages: 

    219-231
Measures: 
  • Citations: 

    0
  • Views: 

    12
  • Downloads: 

    0
Abstract: 

In this paper, we determine the fuzzy similarity measure between the ranking of states with respect to best the states for work for women and work in general. We break the states into regions and determine the same fuzzy similarity measures for each region. We find that the fuzzy similarity measures range from high to very high. We develop new fuzzy similaritymeasures to be used in rankings.

Yearly Impact: مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

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Author(s): 

Issue Info: 
  • Year: 

    2022
  • Volume: 

    11
  • Issue: 

    8
  • Pages: 

    165-174
Measures: 
  • Citations: 

    1
  • Views: 

    16
  • Downloads: 

    0
Keywords: 
Abstract: 

Yearly Impact: مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

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Issue Info: 
  • Year: 

    2009
  • Volume: 

    17
  • Issue: 

    3 (67)
  • Pages: 

    73-92
Measures: 
  • Citations: 

    3
  • Views: 

    2118
  • Downloads: 

    0
Abstract: 

For taking advantage of Mathematical Programming models in determination of cultivation optimum pattern in farms with attention to risk and Uncertainly conditions and despite indefinite and indistinct information, new techniques of Fuzzy and Interval Programming can be used.In this research, with the use of Interval Linear Programming technique and with attention to statistics of previous tillage periods (1378-1384), cultivation optimum pattern of farmable crops are being determined under risk condition and with the aid of indistinct data and Interval Logic. The case study in this research is a farm with 85 hectare area and chosen crops are: wheat, barley, corn, sun flower, sugar beet and potato. Results indicate that Interval Programming model recommends cultivation optimum pattern of wheat, barley and potato with attention to risk condition and constraints of production, also with endure more risk, land under cultivation of barley and potato show a decrease and an increase respectively and farmers will earn more profit consequently. The results of Mentioned model as well are nearer to real world conditions.

Yearly Impact: مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

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Issue Info: 
  • Year: 

    2023
  • Volume: 

    12
  • Issue: 

    3
  • Pages: 

    209-220
Measures: 
  • Citations: 

    0
  • Views: 

    22
  • Downloads: 

    0
Abstract: 

In this study, a novel sliding mode adaptive controller is developed for three-link PUMA robot, regards to high-gain fuzzy observer in an uncertainty condition. The studied system has uncertain nonlinear functions, multiple inputs and outputs, and non-measurable scenarios, and therefore requires an observation design. To design the controller, fuzzy systems were initially utilized to approximate non-linear uncertain functions, and then a sup posable observer is available to estimate non-measurable system states. Finally, by combining the adaptive fuzzy controller and feedback lineari zation method, a high-gain observer-based fuzzy control was developed. In order to this approach is used as enhance performance indicators of the control system. Fuzzy Takagi-Sugeno systems were employed to find the control gain. In the proposed control method, the convergence of tracking the desired reference signal of the system can be guaranteed by designing the adaption's parameters. The simulation results demonstrated the validity of the control method. .

Yearly Impact: مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

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Issue Info: 
  • Year: 

    2022
  • Volume: 

    3
  • Issue: 

    1
  • Pages: 

    16-32
Measures: 
  • Citations: 

    0
  • Views: 

    154
  • Downloads: 

    0
Abstract: 

Introduction: Today, a different view of the future has caused the intelligent man not to seek to find the future, but to build his desired future by using various tools. Futurism as an emerging discipline has received a great deal of attention in recent decades from governments, academia, and businesses, and the achievements of futurists are now very important in the decision-making of governments, institutions, and private companies. Examining the studies conducted in the field of urban development, it was found that no research in this field in the field of sociology of development and economics has been conducted so far, and this shows the uniqueness of the subject. In order to study and identify the different dimensions and characteristics of urban development, especially Tehran, in the articles and research conducted so far, an in-depth study was conducted to obtain sufficient knowledge of the various dimensions of the issue. Background examination shows that modeling and identification of key forces has not been done so far. Materials and Methodes: The present study has identified the main drivers of urban development in Tehran metropolis using the interaction analysis technique, which is one of the common and accepted methods of futurism, and using MicMac software. In order to analyze the data, a futuristic toolbox including expert opinion, trend analysis in the field of urbanization and urbanization, interaction analysis and scenario planning has been used. For this purpose, by studying the sources of domestic and foreign libraries, all the factors affecting the development of Tehran were examined and after preparing a list of these factors, in research sessions with experts, the research findings were completed and a questionnaire was developed based on them. And the poll process began. First, the main factors of the category of city and urbanization are identified and in the next stage, using the method of interaction analysis, the interaction of these factors on each other is measured and key factors are identified. In the next stage, after selecting the Delphi methods to determine the relationship between the selected indicators, the first stage Delphi questionnaire was prepared and presented to the experts. Then, according to the answers of the first stage of Delphi, the questionnaire of the second stage was designed and the required data were extracted by referring to the mentioned elites and experts. Finally, with the help of software (MicMac) and interaction analysis method, data were analyzed and research scenarios were presented. Findings: According to the research findings, according to the results of Mick Mac, four factors of integrated urban management, economic situation, poverty and good urban governance were identified as the first four factors influencing the system. According to the score of direct and indirect influence of 51 factors, finally the first 12 factors affecting the future of Tehran metropolis development were selected to determine the final uncertainties and were scored according to the importance and predictability. And the drivers that had the most uncertainty in the future development of Tehran in order to present future scenarios of Tehran development were identified that the three variables of integrated urban management, economic status and poverty were selected as the most influential variables and uncertainty. According to studies, among the 15 key factors with high net impact, considering that the two variables of social capital and social harms are located in the southeastern part of the chart and their impact is low, as well as improving worn-out tissue in the area of independent variables with impact and the impact is low, key factors can be omitted to expand the selection. So in the end, 12 factors remained, of which 12 final key factors, 4 variables are in the first zone or influential variables, and 8 variables are in the second zone or twodimensional variables, of which 2 are economic status and poverty in the dual zone, 4 The variables of social and spatial justice, good urban governance, responsibility of citizens and promotion of education and culture are in the risk area and the two variables of participation and security are in the target area. Also, no factors were selected from other influential and independent areas. Also, based on the type, out of the 12 key factors and final drivers, 6 were economic factors, 4 social factors and 2 managerial factors, which indicate the role and importance of economic factors in the development of Tehran and its development prospects. Conclusion: The study of trends in the metropolis of Tehran, which has been done in the current situation studies, the views of high-level projects and points of view and the results of interviews with all managers in Tehran indicate compliance with the results of the futures questionnaire in identifying and determining key factors affecting the future, Metropolitan development. Inequality in development and the problems in the metropolis of Tehran will more or less continue until the resource allocation system succeeds in achieving spatial balances, justice in space, and economic and social justice.

Yearly Impact: مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

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Issue Info: 
  • Year: 

    2023
  • Volume: 

    21
  • Issue: 

    69
  • Pages: 

    55-79
Measures: 
  • Citations: 

    0
  • Views: 

    116
  • Downloads: 

    10
Abstract: 

In postmodern novels, the concept of identity does not enjoy any coherence and stability existing in pre-modern novels. Indeed, such a concept is fragmented, disjointed and unstable. Narrative in postmodern stories is thus unreliable, suspicious and contradictory due to the fragmented and fluid identities of the characters. One of the most prominent and prolific writers in the contemporary era is Mohammad Reza Kaateb, some of whose novels are similar to postmodernist elements. In so doing, the concept of identity and narrative is disclosed in this study. In this research, in a descriptive and analytical way, six novels of the author named "Aftab Prast-e Nazanin (Lovely Chameleon)", "Balzans (The Fliers )", "Bi Tarsi (Fearless)", " Pasti (Dowmhill)", " Ram Konandeh (The Domesticator)" and "Hiss" from the point of view of postmodernist components. Identity, character and narration have been investigated. The findings show that most of the characters in the addressed novels are of indeterminate, fragmented identities. Wandering, displacement and overlapping of characters with each other, inability in self-recognition, is evidence to their disjointed identities. Fragmented and contradictory narratives in characters and adventures are one main feature that marked the writer's novels with uncertainty. The post-modernist components of ontological doubt, uncertainty and fragmentation and contradiction in identity and narrative are very impressive in such novels as Lovely Chameleon, Downhill, The Domesticator and Hiss. In contrast, The Fliers and Fearless have used such elements to a milder extent.

Yearly Impact: مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

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Issue Info: 
  • Year: 

    2011
  • Volume: 

    5
  • Issue: 

    20
  • Pages: 

    167-185
Measures: 
  • Citations: 

    1
  • Views: 

    3847
  • Downloads: 

    0
Abstract: 

Intolerance of Uncertainly, Cognitive avoidance, Negative problem orientation and Positive beliefs about worry play an important role in Generalize anxiety disorder (GAD) and leads to development and maintain of GAD. The purpose of this research was comparing of these cognitive variables among GAD patients and normal people. For this aims thirty GAD patients and thirty normal people were selected using intact sampling. Then Intolerance of Uncertainly questioner, Cognitive avoidance questioner, Negative problem orientation questioner and why worry II was administrate. The results showed that there is significant different among groups in Negative problem orientation (p<0/0001, F=19/13) and Intolerance of Uncertainly (p<0/0001, F=23/88). The practical and theoretical implications of the research were discussed in the section of discussion.

Yearly Impact: مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

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Issue Info: 
  • Year: 

    2019
  • Volume: 

    2
  • Issue: 

    4
  • Pages: 

    319-330
Measures: 
  • Citations: 

    0
  • Views: 

    299
  • Downloads: 

    234
Abstract: 

Nowadays, power distribution companies are working in a competitive atmosphere. Therefore, a major goal for electricity distribution managers is to provide electrical energy with a high reliability level with considering the economic issues. Reliability-centered maintenance (RCM) is an efficient way of realizing this aim and improving a network’ s maintenance processes. This approach is an operative step to improve the reliability of critical equipment and overall system performance which may reduce the costs of utilities. By using RCM, this paper provides a practical model for maintenance scheduling by considering the economic risk function and budget restrictions based on the cost of preventive maintenance (PM) and value of lost load (VOLL). In this method, PM schedules are proposed based on failure causes of different network elements. The studied elements include overhead lines, underground cables, and power switches (circuit breaker (CB), manual and remote control switches (RCSs)). Failure cause and average repair time of each element is determined through data mining in geographical information system (GIS) and ENOX. For more realistic modeling and the consideration of the network loads’ uncertainties, the fuzzy triangular method is used. Due to the inconsistency between the goals of the problem, the non-dominated sorting genetic algorithm (NSGA II) is employed. The results show the effectiveness of the proposed method.

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