List of Articles روش تجزیه

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  1 - Solution of Inverse Kinematic Problem of a 2DOF Robot Using Decomposition Method
  Gh Asadi-Cordshooli A. Vahidi R. Norouzi
  The inverse kinematics problem of a two degree of freedom (2DOF) planar robot arms issolved using Adomian’s decomposition method (ADM), after converting to a system of twononlinear algebraic equations. The advantage of the method is that it gives the solutions asf More

  The inverse kinematics problem of a two degree of freedom (2DOF) planar robot arms issolved using Adomian’s decomposition method (ADM), after converting to a system of twononlinear algebraic equations. The advantage of the method is that it gives the solutions asfunctions of the desired position of the end effecter and the length of the arms. The accuracyof the solutions can be increased up to desired order. The solutions haven’t any singularity.The problem must be solved once for any structure and the results can be used for any pathand finally, the method is fast and simple to understand Manuscript profile
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  2 - Environmental Risk Assessment of Sponge Iron production unit in Khorasan Steel Company Using Comparative Methods ETBA and JSA
  Samaneh Sanjari Sahar Rezaian Seyed Ali Jozi
  10.22034/jest.2017.11220
  Background and Objective: The present study was conducted in line with the manufacturers’ awareness and tendency towards minimizing the hazards associated with workplace compounded by technological developments and utilization of modern machinery leading to the in More

  Background and Objective: The present study was conducted in line with the manufacturers’ awareness and tendency towards minimizing the hazards associated with workplace compounded by technological developments and utilization of modern machinery leading to the increase of both production rates and eventual soaring risk probabilities. Employing Job Safety Analysis (JSA) and Energy Trace and Barrier Analysis (ETBA) methods, the study aims to assess the environmental risk of direct recovery unit. Method: The process began with identification of environmental risks associated with this unit through the abovementioned methods. After identification of risks, the strengths and weaknesses of each method were compared, and finally separate evaluations were conducted using each method. Findings: Six high-risk jobs were identified in Job Safety Analysis Method. 47 hazards were identified to be at the unacceptable risk level in 2 cases, unfavorable risk level in 28 cases and acceptable risk level in 17 cases. In Energy Trace and Barrier Analysis method, 9 types of energy were identified by using energy checklist. The most important risks associated with these energies are reduction gas leakage and increase of gas pressure inside the furnace. In this method, 17 risks were identified in to be at the unacceptable risk levelin 3 cases, unfavorable risk levelin 7 cases, acceptable upon revisit in 3 cases and acceptable with no need for revisitin 4 cases. Conclusion: Implementing the security principles based on personal observations and interviews with experts and using opinions of production experts, proposition was made to make use of a general method combining the two aforesaid methods instead of applying each method separately in orde to ensure the highest efficiency and staff safety. Manuscript profile
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  3 - حل تقریبی نوسانگر غیرخطی تصادفی
  طیبه دمیرجلی
  در این مقاله ، معادلات غیر خطی با نویز سفید افزودنی را در نظر می گیریم ، که حل آنها با روش های تحلیلی غیرممکن است. توابع بلاک پالس به عنوان توابع پایه ای برای حل این معادلات ارائه شده است. به منظور بررسی اعتبار این روش ، از روش تجزیه آدومین  برای حل تقریبی معادلات More

  در این مقاله ، معادلات غیر خطی با نویز سفید افزودنی را در نظر می گیریم ، که حل آنها با روش های تحلیلی غیرممکن است. توابع بلاک پالس به عنوان توابع پایه ای برای حل این معادلات ارائه شده است. به منظور بررسی اعتبار این روش ، از روش تجزیه آدومین  برای حل تقریبی معادلات تصادفی دافینگ استفاده شده است.  نتایج نشان می دهد که روش پیشنهادی بسیار موثر است. Manuscript profile
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  4 - نسخه ی محدود شده ایی از روش تجزیه کرات برای حل دستگاه های خطی مختلط فازی
  M. Ghanbari
  در این مقاله، نشان داده شده است که بردار جواب به دست آمده به وسیله ی روش تجزیه ی کرات کلاسیک، جواب جبری یک دستگاه خطی مختلط فازی نمی باشد. در اینجا، برای به دست آودن جواب جبری یک دستگاه خطی مختلط فازی(اگر وجود داشته باشد)، نسخه ی محدود شده ایی از روش ذکر شده را ارائه می More

  در این مقاله، نشان داده شده است که بردار جواب به دست آمده به وسیله ی روش تجزیه ی کرات کلاسیک، جواب جبری یک دستگاه خطی مختلط فازی نمی باشد. در اینجا، برای به دست آودن جواب جبری یک دستگاه خطی مختلط فازی(اگر وجود داشته باشد)، نسخه ی محدود شده ایی از روش ذکر شده را ارائه می کنیم. دو مثال عددی برای نشان دادن کارایی و توانایی روش پیشنهادی، ارائه شده اند. Manuscript profile
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  5 - Environmental risk assessment of urban development projects Tehran 19th District using spatial EFMEA (Case study: the operation of provincial parks)
  salman hematinia Sahar Rezaeyan Seyed Ali Jozi
  Risk assessment approach is a key element in the establishment and development of management systems. The components of the management systems more and more closely at the results more credible, respectively. One component that is particularly involved in issues of the More

  Risk assessment approach is a key element in the establishment and development of management systems. The components of the management systems more and more closely at the results more credible, respectively. One component that is particularly involved in issues of the environment component is location. The system is designed to produce, analyze, store and display spatial data is geographic information system. The aim of this study was identification and assessment of environmental risk factors with using non-spatial and spatial components including their location and extent of risks affect risk using spatial analysis of failure modes and effects on the environment (Spatial-EFMEA). At first checklist was prepared and preliminary assessment. Then complete Spatial-EFMEA worksheet and then according to the table, analyzed the likelihood and extent of risks and compute risk priority numbers respectively. Finally, using the frequency distribution method, results of the risk levels from low frequency, very low, low, medium, high, very high and critical level were classified for above-average levels of risk control measures and evaluate the proposed secondary. The results showed that 9% of risk associated with the buildings, 25 percent of risk associated with the green space, 16% of risk associated with the Green Ring and band Hulk, 16 percent of risk associated with the women area, 11% of risk associated with the sport area, 6% of risk associated with the parking and 17% of risk associated with the public area.   Manuscript profile
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  6 - Analysis of effective factors of organizational architecture in improving supply chain management with hierarchical analysis method (Case study: oil and gas exploitation)
  Ahmadreza Hosseinzadeh محمدابراهیم پورزرندی Mohammad Ali Afshar Kazemi
  In recent years, with the changing conditions of global markets, organizations have realized that in order to grow and survive in today''s turbulent environment, special attention must be paid to the supply chain. The oil industry is one of the industries in which socia More

  In recent years, with the changing conditions of global markets, organizations have realized that in order to grow and survive in today''s turbulent environment, special attention must be paid to the supply chain. The oil industry is one of the industries in which social and environmental issues have been strongly emphasized. In this study, in order to improve supply chain management, we have identified the main, sub-criteria and the role of effective factors in organizational architecture, their effective interactions with each other in order to achieve research objectives. This article has been done by using the opinion of experts and using a questionnaire and hierarchical analysis method in the process of oil and gas production operation, the results show that in the main criteria, respectively, integrity, accountability , Flexibility and sub-criteria of reducing delivery time, and jointly integrated within the organization and increase / decrease production, jointly external integration and outsourcing, and then reduce costs, respectively, have the greatest impact. Among the organizational architecture options, process work, decision process, organizational structure, and then production and distribution of information have the most impact, respectively. Manuscript profile
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  7 - Using cause and Effect Diagram to Survey the Cause of Bankruptcy and Slump Domestic Industries by QFD & FMEA Approach
  Mohammad Amin HesamiNezhad Mahnaz Zarei Mohammad Bagher Moayedi
  In paying attention to the recent years, domestic industries encounter severe slump and some of them has become insolvent, some are also at the beginning of bankruptcy. The existence of a research that would be able to applicability and simply show the causes of domesti More

  In paying attention to the recent years, domestic industries encounter severe slump and some of them has become insolvent, some are also at the beginning of bankruptcy. The existence of a research that would be able to applicability and simply show the causes of domestic industries bankruptcy, and make it flexible to the government`s honorable attendants, congress representatives, judicature, and other governmental and private organizations, has been less seen. Therefore, the writers of this article have tried at the first step to extract the main causes of bankruptcy and slump domestic industries from the writing and speeches of country`s attendants and experts and specialists. At the second step, the causes are presented to specialists and advisers of Ministry of Industry and Mining. Then by using Quality Function Deployment (QFD) and Failure Mode and Effect Analysis (FMEA) more than 90 problems are extracted, classified and prioritized, and then the obtained results are used as input to draw cause and effect diagram (fishbone diagram). In this article to draw cause and effect diagram, the bankruptcy causes and slump domestic industries are categorized into 8 parts: 1. government, 2. domestic industries, 3. goods smuggling, 4. bank, 5. judicature, 6. Congress, 7. environment, and 8. people. On the one hand, this diagram can simply show the domestic industries problems based on their importance and on the other hand specify the related organizations to solve the problems. This current research from the viewpoint of purpose is an active research and from the aspect of approach and nature is a descriptive-applicable research in which the library approach is used to gather information, and also experts judgment are used for validity and reliability. Manuscript profile
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  8 - Climatic zoning of Shahrood city based on windbreak location indices and parameters affecting thermal comfort
  tayebe valian s.majid mofidi mahnaz mahmoodi
  The purpose of this study is to locate windbreaks in Shahrood city with respect to climatic zoning and thermal comfort. This research is applied in terms of purpose. First, by examining the theoretical foundations, the initial list of indicators affecting the location o More

  The purpose of this study is to locate windbreaks in Shahrood city with respect to climatic zoning and thermal comfort. This research is applied in terms of purpose. First, by examining the theoretical foundations, the initial list of indicators affecting the location of windbreaks was prepared and reviewed and approved by Delphi fan. Then, in order to find areas prone to windbreak, a hybrid model was used. Also, the Olegi model was used to determine the thermal comfort in Shahrood and to identify suitable times for using windbreaks. This model incorporates the Analytical Hierarchy Process (AHP) technique and the Geographic Information System (GIS). Tools used included ArcGIS software, version 9.3 and Expert Choice software, version 2004. Paired comparison method was used to weight the indicators and zones. Six indicators of sundial, wind, altitude, temperature, relative humidity and rainfall were identified for windbreak location. Relative humidity index with a weight of 0.38 had the highest and height index with a weight of 0.154 had the lowest score. The months of May and June are in the zone of thermal comfort and there are times when windbreaks will not be very useful in Shahrood city. On the other hand, July, August and September due to high temperatures and December, January, February and March due to high cold are good times to use windbreaks. Finally, the layer related to each indicator was prepared and drawn for Shahrood city. The use of hierarchical analysis method combined with GIS and layer superimposing method makes it possible to identify and determine the optimal location for a variety of uses in a wide geographical area. Manuscript profile
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  9 - استفاده از روش تجزیه Adomian و روش تکرار متغیر برای مشکلات سیستم پویا
  Babatunde Yisa
  روش تجزیه Adomian و روش تکرار Variational Hee برای مشکلات نوسانگر غیرخطی که شامل نوسانگرهای محافظه کار است ، اعمال می شوند. به دلیل الگوریتم هایی که اصطلاحات غیرخطی را در مشکلات پذیرفته اند ، روش ها برای موارد عمومی و خاص موثر هستند. این دو روش بر روی برخی از مشکلات خاص More

  روش تجزیه Adomian و روش تکرار Variational Hee برای مشکلات نوسانگر غیرخطی که شامل نوسانگرهای محافظه کار است ، اعمال می شوند. به دلیل الگوریتم هایی که اصطلاحات غیرخطی را در مشکلات پذیرفته اند ، روش ها برای موارد عمومی و خاص موثر هستند. این دو روش بر روی برخی از مشکلات خاص در ادبیات آزمایش شده است ، و نتایج به دست آمده در مقایسه با نتایج به دست آمده از طریق استفاده از روش تعادل انرژی مقایسه شده است. Manuscript profile
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  10 - Concept Interpretation, Development of Research Methods in Librarianship and Information Decimination Using Concept Interpretation
  hojjat allah hasan
  Content analysis is a methodology for studing the content to identifying specified characteristics of messages. The method of content analysis enables the researcher to large amounts of textual information and systematically identify its properties. In this methodology More

  Content analysis is a methodology for studing the content to identifying specified characteristics of messages. The method of content analysis enables the researcher to large amounts of textual information and systematically identify its properties. In this methodology two aims are predicted. 1)evaluating content capability to match the educational collection . 2)suitability of texts with mental ability . This article tries to define content analysis and introduce the ways in which researcher can provide a meaningfal reading content. Content analysis can also involve any kind of communication content analysis(speech, written text, interviews, journals, discussions, lectures, …).   Manuscript profile
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  11 - A Numerical method for solving the problem of Pricing American Options under the CIR stochastic interest rate model
  Abodolsadeh neisy maryam safaei Nader Nematollahi
  The main purpose of this study is to derive the price of American put option, when the interest rate follows a stochastic process. For this purpose, first underlying asset model is expanded to CIR stochastic interest rate model. Then, the problem of American option pric More

  The main purpose of this study is to derive the price of American put option, when the interest rate follows a stochastic process. For this purpose, first underlying asset model is expanded to CIR stochastic interest rate model. Then, the problem of American option pricing under CIR stochastic interest rate model is formulated as a two-dimensional linear complementarity problem (LCP). We propose a two-cycle componentwise splitting method for solving this two-dimensional LCP. In this method, the two-dimensional LCP, obtained for the valuation of an American option, is decomposed into six one-dimensional LCPs in several fractional time steps, and then each LCP is solved numerically in two steps. So that in the first step, the tridiagonal systems of equations are solved, and then in the second step (update step), the obtained values of option prices are modified and updated according to the conditions of the American option pricing problem. Finally, the numerical results obtained by splitting introduced method are compared with the Monte Carlo simulation results Manuscript profile
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  12 - حل مساله ی غیرخطی نوسانگرهای سخت شونده و نرم شونده با روش تجزیه ی آدومین
  بهرام گل محمدی قاسم اسعدی کردشولی علیرضا وحیدی
  یکی از عوامل ایجاد اثرات غیرخطی در سیستمهای نوسانی، غیرخطی بودن تابع نیروی بازگرداننده است که طیف وسیعی از آن­ها با تابع چندجمله­ای درجه سه و انتخاب ضرایب مناسب مدل­سازی می­شوند. در این مقاله یک سیستم نوسانگر جرم - فنر تحت تاثیر چنین نیروی بازگرداننده&sh More

  یکی از عوامل ایجاد اثرات غیرخطی در سیستمهای نوسانی، غیرخطی بودن تابع نیروی بازگرداننده است که طیف وسیعی از آن­ها با تابع چندجمله­ای درجه سه و انتخاب ضرایب مناسب مدل­سازی می­شوند. در این مقاله یک سیستم نوسانگر جرم - فنر تحت تاثیر چنین نیروی بازگرداننده­ای درنظر گرفته­ شده و دو دسته پارامتر طوری انتخاب شده­اند که معادلات حرکت دو نوسانگر سخت شونده و نرم شونده از کاربرد قانون دوم نیوتن به­دست آیند. این معادلات دیفرانسیل غیرخطی مرتبه دو ابتدا با استفاده از روش تجزیه­ی آدومین حل شده­اند. در مرحله­ی بعد ابتدا معادلات به دستگاه معادلات مرتبه یک تبدیل و سپس مجددا با روش آدومین حل شده­اند. با توجه به این­که طرف دوم معادلات دیفرانسیل حل شده، برابر با صفر است، برای مقایسه­ی نتایج، پاسخ­ها در معادله قرارگرفته و انحراف آن­ها از صفر به عنوان خطا درنظر گرفته شده­است. مقایسه­ی نتایج نشان می­دهد که روش به­کار رفته برای هر دو مساله از دقت مناسب برخوردار است و همچنین تبدیل معادله به  دستگاه معادلات مرتبه­ی پایین­تر منجر به حصول پاسخ­های دقیق­تر می شود.   Manuscript profile
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  13 - Investigating the performance of several frequency domain and time domain methods in calculating the dynamic parameters of a three-story structure using operational modal analysis
  Mohsen Mahdavi Adeli Hesam Makvandi
  In this research, a practical method for finding modal parameters in structures is investigated. At first, two methods in the frequency domain called FDD and EFDD frequency domain analysis methods and a time domain method called SSI are defined. In order to check the ac More

  In this research, a practical method for finding modal parameters in structures is investigated. At first, two methods in the frequency domain called FDD and EFDD frequency domain analysis methods and a time domain method called SSI are defined. In order to check the accuracy of these methods in identifying the modal parameters of real structures, a three-story structure modeled in Ansys software will be used. This structure was modeled by Ansys software and the correctness of the model performance was confirmed by comparing the results of modal analysis of the structure with the results of experimental tests. The acceleration response obtained from the created model is given as an input to environmental modal analysis methods, whose responses are compared with actual results. It was observed that all three methods could estimate the frequencies, mode shapes and damping coefficients of the structure with high accuracy. It is also observed that using the SSI method is easier, but the FDD and EFDD methods need less time to solve. Manuscript profile