فهرس المقالات Reliable

• حرية الوصول المقاله
  • صفحة الملخص
  • نص كامل
  
  1 - الگویی از روش‌ اجتهاد در عرفان مأثور (مطالعۀ موردی: روش کتاب سرالاسراء)
  مصطفی همدانی
  ارتباط معنوی عارفانه و عاشقانه با حضرت پروردگار که عرفان به آن توصیه می­کند، نیاز بنیادی­ انسان در تمام زمان­ها بوده و هست؛ اما متاسفانه در روزگار ما شورابه­ هایی ناگوار به جای عرفان حقیقی و خوش­گوار به کام انسان معنویت­ خواه ریخته می­شود و احیاناً آموزه­های وحیانی نیز أکثر

  ارتباط معنوی عارفانه و عاشقانه با حضرت پروردگار که عرفان به آن توصیه می­کند، نیاز بنیادی­ انسان در تمام زمان­ها بوده و هست؛ اما متاسفانه در روزگار ما شورابه­ هایی ناگوار به جای عرفان حقیقی و خوش­گوار به کام انسان معنویت­ خواه ریخته می­شود و احیاناً آموزه­های وحیانی نیز با روش­هایی نادرست و غیراجتهادی به اسم عرفان اسلامی فرآوری می­شود. استاد عرفان عصر حاضر، آیت الاهی مرحوم استاد سعادت­پرور از عارفان مجتهدی است که همواره سعی کرده است روش تفقه اجتهادی را در استنباط آموزه­های عرفانی به کار گیرد؛ و از این­رو پژوهۀ فرارو با شیوۀ اسنادی- کتابخانه­ای به استخراج الگوی روش اجتهاد در عرفان مأثور بر اساس شیوۀ اجتهاد فقاهتی و طبق روش­ های موجود در پس ­زمینۀ تبیین­ های استاد سعادت ­پرور در کتاب سرالاسراء دست یازیده است. نتیجۀ تحقیق، ارائۀ الگویی کثیرالاضلاع شامل تحلیل سندشناختی، تحلیل تفسیری و فقه­ الحدیثی با محوریت قواعد عام، قواعد ادبی و اصولی و روش­های حل اختلاف روایات متعارض و تفسیر روایات مشکل و نیز تحلیل عقلانی آیات و روایات عرفانی با ابتکار در تاکید بر آیات قرآنی و بهرۀ وافر از ادعیه در منابع و بهره بردن از قواعد بلاغی در استنباط است. تفاصيل المقالة
• حرية الوصول المقاله
  • صفحة الملخص
  • نص كامل
  
  2 - Estimating and checking the Reliable water supply of Ekbatan dam Reservoir based on the Reliability level of drinking and Agricultural needs of Hamedan city
  کوشا خاتونی رضا فرزاد
  With the growing number of recent droughts in the country, correct management of water resources and prioritization of allocation, especially in cities that are in a critical situation, are important and necessary issues. The amount of water allocation in reservoir dams أکثر

  With the growing number of recent droughts in the country, correct management of water resources and prioritization of allocation, especially in cities that are in a critical situation, are important and necessary issues. The amount of water allocation in reservoir dams in different months is determined according to the reserve of the reservoir. Therefore, the purpose of this research is to estimate and check the reliability of Ekbatan Reservoir Dam in Hamedan city based on drinking and agricultural water needs, which according to the annual rainfall statistics of this basin and modeling the simulation of reliable irrigation in the MATLAB software environment. Investigating this is important and fundamental. The results of the research show that by simulating the reliable water supply of Ekbatan Dam, the water supply of this dam will be able to supply these needs according to the statistical data of rainfall, with the aim of providing 90% of the drinking needs and 80% of the agricultural needs of the dam reservoir, and it can be said that the model The reservoir defined in this research is suitable for preparing the command curve for reservoir dams due to its ability to reduce shortages and prevent the occurrence of severe shortages تفاصيل المقالة
• حرية الوصول المقاله
  • صفحة الملخص
  • نص كامل
  
  3 - Torque Control of Brushless Direct Current Motor Drives Using Single Current Sensor with High Reliability
  Mohsen Ebadpour Ahad Farzinfar
  Due to the simple structure, high torque density, low maintenance, and high efficiency, brushless direct current (BLDC) motors are widely used in automation and industrial applications. A control strategy based on single current sensor is proposed for a four-switch thre أکثر

  Due to the simple structure, high torque density, low maintenance, and high efficiency, brushless direct current (BLDC) motors are widely used in automation and industrial applications. A control strategy based on single current sensor is proposed for a four-switch three-phase BLDC motor system to lower cost and improve reliability. The whole working process of the BLDC motor is divided into six modes. Phase c involves four modes, including modes 2, 3, 5, and 6. Only one switch will work in these modes. In modes 1 and 4, two switches will work simultaneously and current flows through phases a and b. Compared to the most recent and highly performed torque control strategy, the proposed offers an improved reliability thanks to the achievement of balanced switching frequencies of the inverter upper and lower switches. Furthermore, the torque ripple is significantly damped during sector-to-sector commutations using a hysteresis current controller. The effectiveness of the proposed system has been validated by simulation results using MATLAB/Simulink software in various operation conditions. تفاصيل المقالة
• حرية الوصول المقاله
  • صفحة الملخص
  • نص كامل
  
  4 - Green Synthesis of Metal nanoparticles by microorganisms; a current prospective
  Jafar Ali Shama Zainab Naeem Ali
  10.22034/jna.2015.1.004
  Synthesis and applications of nanomaterials has been an interesting area of nanotechnology since last decade. Several physico-chemical methods have been used to synthesize the nanoparticles of noble metals. Numerous other methodologies are also in practice including the أکثر

  Synthesis and applications of nanomaterials has been an interesting area of nanotechnology since last decade. Several physico-chemical methods have been used to synthesize the nanoparticles of noble metals. Numerous other methodologies are also in practice including the laser ablation, aerosol technologies, lithography, and ultraviolet irradiation. However, traditional methods are less preferred because they remain costly and involve the use of hazardous chemicals. Biological routes of synthesizing metal nanoparticles via microbes is gaining much attention due to their low toxicity, biocompatibility and eco-friendly nature. The development of reliable, eco-friendly, sustainable processes for the synthesis of nanoparticles with precise shapes, sizes and dispersity is a progressive area of nano-biotechnology. Despite the higher stability of biogenic nanoparticles there is still need to optimize the synthesis rate and other factors affecting the synthesis process. Microbial synthesis of silver, gold, platinum, titania, zirconia, magnetite nanoparticles and quantum dots has been described successfully. However molecular mechanisms that mediates the synthesis of nanoparticles should be elucidated further to improve the properties of nanoscale materials and production rate. Due to the rich biodiversity of microbes, their potential as a useful source for the production of nanoparticle is yet to be fully explored. The present review emphases the current status of potential microbial sources for the synthesis of metal nanoparticles. تفاصيل المقالة
• حرية الوصول المقاله
  • صفحة الملخص
  • نص كامل
  
  5 - انتخاب گره‌های میانی قابل‌اعتماد برای ارسال پیام‌های بلادرنگ در شبکه خودرویی
  یاسر تاج بهادر بخشی سراسکانرود حسام زندحسامی
  یکی از اهداف سیستم های حمل و نقل هوشمند، بهبود ایمنی و افزایش کیفیت سرویس در سفرهای جاده ای است. انتقال پیام در شرایط بحرانی، با حداقل تاخیر و به صورت بلادرنگ از ضروریات تامین سلامت و امنیت شهروندان در سفرهای جاده ای است. تغییرات مکرر توپولوژی، کارکرد برنامه های ایمنی ر أکثر

  یکی از اهداف سیستم های حمل و نقل هوشمند، بهبود ایمنی و افزایش کیفیت سرویس در سفرهای جاده ای است. انتقال پیام در شرایط بحرانی، با حداقل تاخیر و به صورت بلادرنگ از ضروریات تامین سلامت و امنیت شهروندان در سفرهای جاده ای است. تغییرات مکرر توپولوژی، کارکرد برنامه های ایمنی را با چالش های اساسی روبرو می کند و احتمال ارسال پیام های بحرانی را در زمان واقعی کاهش می دهد. در این پژوهش، الگوریتم مسیریابی انتخاب گره رله قابل اعتماد برای پیام رسانی بلادرنگ (RRRM)، با هدف افزایش قابلیت اطمینان برای ارسال پیام های بلادرنگ در شبکه های خودرویی پیشنهاد شده است و برای تسریع ارسال اطلاعات، با معرفی سه شاخص برای انتخاب خودروهای میانی با عنوان سابقه تکرار حضور در مسیر، مطابقت با میانگین هارمونیک سرعت همسایگان و بیشترین همسایگان قابل اعتماد، خودروهای مسیر امتیازدهی می شوند و شایسته ترین خودروها، به عنوان اعضای مسیر انتخاب می شوند. در RRRM با سنجش تطابق زمانی حضور قبلی خودروها در مسیر کنونی و پایداری ارتباط آنها با خودروهای همسایه، بر افزایش پایداری مسیر تاکید می شود و با جلوگیری از انتخاب وسایل- نقلیه نامطمئن به عنوان رله، از شکست مسیر و افزایش تاخیر و همچنین عدم ارسال پیام های بحرانی به مقصد جلوگیری می شود. شبیه سازی گسترده با سناریوهای متعدد در محیط NS-3 و سومو، بیانگر برتری روش RRRM در کاهش معیارهای شکست-مسیر، میانگین تاخیر و سربار کنترلی و همچنین افزایش نرخ تحویل بسته ها در محیط های شهری و بزرگ راهی است. تفاصيل المقالة
• حرية الوصول المقاله
  • صفحة الملخص
  • نص كامل
  
  6 - طراحی ابزاری برای سنجش سواد اطلاعاتی دانشجویان دانشگاه پیام نور استان همدان
  فریدون یزدانی
  هدف اساسی این پژوهش، طراحی ابزاری روا و معتبر برای سنجش مهارت‌های سواد اطلاعاتی دانشجویان در بافت نظام‌های آموزش از دور بوده است. روش تحقیق، توصیفی و از نوع پیمایشی بوده و جامعه آماری آن را کلیه دانشجویان دانشگاه پیام‌نور استان همدان در سال تحصیلی 91-13 أکثر

  هدف اساسی این پژوهش، طراحی ابزاری روا و معتبر برای سنجش مهارت‌های سواد اطلاعاتی دانشجویان در بافت نظام‌های آموزش از دور بوده است. روش تحقیق، توصیفی و از نوع پیمایشی بوده و جامعه آماری آن را کلیه دانشجویان دانشگاه پیام‌نور استان همدان در سال تحصیلی 91-1390، به تعداد 28530 نفر تشکیل می‌دادند. شیوه نمونه‌گیری، تصادفی خوشه‌ای بود و بر این اساس تعداد 387 نفر از دو مرکز، بر اساس فرمول نمونه‌گیری کرجسی و مورگان انتخاب گردید. برای جمع‌آوری اطلاعات، ابزاری به نام پرسش‌نامه سنجش سواد ‌اطلاعاتی توسط محقق بر اساس معیارهای علمی و مبتنی بر طیف لیکرت ساخته شد. این ابزار دربرگیرنده 5 مؤلفه (مبتنی بر 5 استاندارد سواد ‌اطلاعاتی) و 30 گویه است که آزمودنی باید آن‌ را به ‌شیوه خود - ارزیابی پاسخ دهد. برای مناسب‌سازی گویه‌های آن از توان افتراقی و برای بررسی روایی آن از روایی محتوایی، صوری و سازه (روایی همگرا و تحلیل عاملی) استفاده شد. بر این اساس، میزان همبستگی بین این آزمون و آزمون اصغرنیا (1388) در روایی همگرا 77/0 بود. هم‌چنین نتیجه تحلیل عاملی اکتشافی (به روش تحلیل مؤلفه‌های اصلی) بر روی پرسش‌نامه منجر به استخراج 6 عامل با واریانس تراکمی نزدیک 66 درصد گردید. برای تعیین میزان پایایی آن به‌شیوه همسانی درونی نیز از آزمون آلفای کرونباخ استفاده شد که برای کل گویه‌ها 94/0 محاسبه شد. نتایج نشان داد که پرسش‌نامه سنجش سواد اطلاعاتی برای سنجش سواد اطلاعاتی دانشجویان در بافت نظام‌های آموزش از دور مناسب بوده و از روایی و پایایی لازم برخوردار است. نتیجه دیگر پژوهش نیز نشان داد که بین سن و سطح سواد اطلاعاتی دانشجویان رابطه مثبت و معناداری وجود دارد. تفاصيل المقالة
• حرية الوصول المقاله
  • صفحة الملخص
  • نص كامل
  
  7 - Fault tolerant system with imperfect coverage, reboot and server vacation
  Madhu Jain Rakesh Kumar Meena
  This study is concerned with the performance modeling of a fault tolerant system consisting of operating units supported by a combination of warm and cold spares. The on-line as well as warm standby units are subject to failures and are send for the repair to a repair f أکثر

  This study is concerned with the performance modeling of a fault tolerant system consisting of operating units supported by a combination of warm and cold spares. The on-line as well as warm standby units are subject to failures and are send for the repair to a repair facility having single repairman which is prone to failure. If the failed unit is not detected, the system enters into an unsafe state from which it is cleared by the reboot and recovery action. The server is allowed to go for vacation if there is no failed unit present in the system. Markov model is developed to obtain the transient probabilities associated with the system states. Runge–Kutta method is used to evaluate the system state probabilities and queueing measures. To explore the sensitivity and cost associated with the system, numerical simulation is conducted. تفاصيل المقالة
• حرية الوصول المقاله
  • صفحة الملخص
  • نص كامل
  
  8 - Multiple vacation policy for MX/Hk/1 queue with un-reliable server
  Madhu Jain Richa Sharma Gokul Chandra Sharma
  This paper studies the operating characteristics of an MX/Hk/1 queueing system under multiple vacation policy. It is assumed that the server goes for vacation as soon as the system becomes empty. When he returns from a vacation and there is one or more customers waiti أکثر

  This paper studies the operating characteristics of an MX/Hk/1 queueing system under multiple vacation policy. It is assumed that the server goes for vacation as soon as the system becomes empty. When he returns from a vacation and there is one or more customers waiting in the queue, he serves these customers until the system becomes empty again, otherwise goes for another vacation. The breakdown and repair times of the server are assumed to follow a negative exponential distribution. By using a generating function, we derive various performance indices. The approximate formulas for the probability distribution of the waiting time of the customers in the system by using the maximum entropy principle (MEP) are obtained. This approach is accurate enough for practical purposes and is a useful method for solving complex queueing systems. The sensitivity analysis is carried out by taking a numerical illustration. تفاصيل المقالة
• حرية الوصول المقاله
  • صفحة الملخص
  • نص كامل
  
  9 - (m, M) Machining system with two unreliable servers, mixed spares and common-cause failure
  Madhu Jain Ragini Mittal Rekha Kumari
  This paper deals with multi-component machine repair model having provision of warm standby units and repair facility consisting of two heterogeneous servers (primary and secondary) to provide repair to the failed units. The failure of operating and standby units may oc أکثر

  This paper deals with multi-component machine repair model having provision of warm standby units and repair facility consisting of two heterogeneous servers (primary and secondary) to provide repair to the failed units. The failure of operating and standby units may occur individually or due to some common cause. The primary server may fail partially following full failure whereas secondary server faces complete failure only. The life times of servers and operating/standby units and their repair times follow exponential distribution. The successive over relaxation (SOR) technique has been used to obtain the steady state queue size distribution of the number of failed units in the system. To explore the system characteristics, various performance indices such as expected number of failed units in the queue, throughput, etc. have been obtained. Numerical results have been provided to illustrate the computational tractability of the proposed SOR technique. To examine the effect of system descriptors on the performance indices, the sensitivity analysis is also performed. تفاصيل المقالة
• حرية الوصول المقاله
  • صفحة الملخص
  • نص كامل
  
  10 - Cooperative aggregate production planning: a game theory approach
  Ashkan Hafezalkotob Samaneh Chaharbaghi Tahmineh Moradi Lakeh
  Production costs in general, and workforce and inventory costs in particular, constitute a large fraction of the operating costs of many manufacturing plants. We introduce cooperative aggregate production planning as a way to decrease these costs. That is, when producti أکثر

  Production costs in general, and workforce and inventory costs in particular, constitute a large fraction of the operating costs of many manufacturing plants. We introduce cooperative aggregate production planning as a way to decrease these costs. That is, when production planning of two or more facilities (plants) is integrated, they can interchange workforce and products inventory; thus, their product demands can be satisfied at lower cost. This paper quantifies the cost saving and synergy of different coalitions of production plants by a new linear model for cooperative aggregate planning problem. The developed approach is explicated with a numerical example in which inventory and workforce levels of different coalitions of facilities are evaluated. Afterward, a key question would be how the cost saving of a coalition should be divided among members. We tackle the problem using different methods of cooperative game theory. These methods are implemented in the numerical example to gain an insight into properties of the corresponding game results. تفاصيل المقالة
• حرية الوصول المقاله
  • صفحة الملخص
  • نص كامل
  
  11 - Scenario-based modeling for multiple allocation hub location problem under disruption risk: multiple cuts Benders decomposition approach
  Mohsen Yahyaei Mahdi Bashiri
  The hub location problem arises in a variety of domains such as transportation and telecommunication systems. In many real-world situations, hub facilities are subject to disruption. This paper deals with the multiple allocation hub location problem in the presence of f أکثر

  The hub location problem arises in a variety of domains such as transportation and telecommunication systems. In many real-world situations, hub facilities are subject to disruption. This paper deals with the multiple allocation hub location problem in the presence of facilities failure. To model the problem, a two-stage stochastic formulation is developed. In the proposed model, the number of scenarios grows exponentially with the number of facilities. To alleviate this issue, two approaches are applied simultaneously. The first approach is to apply sample average approximation to approximate the two stochastic problem via sampling. Then, by applying the multiple cuts Benders decomposition approach, computational performance is enhanced. Numerical studies show the effective performance of the SAA in terms of optimality gap for small problem instances with numerous scenarios. Moreover, performance of multi-cut Benders decomposition is assessed through comparison with the classic version and the computational results reveal the superiority of the multi-cut approach regarding the computational time and number of iterations. تفاصيل المقالة
• حرية الوصول المقاله
  • صفحة الملخص
  • نص كامل
  
  12 - Adaptive policy of buffer allocation and preventive maintenance actions in unreliable production lines
  Paolo Renna
  The buffer allocation problem is an NP-hard combinatorial optimization problem, and it is an important design problem in manufacturing systems. The research proposed in this paper concerns a product line consisting ofnunreliable machines withn − 1 bu أکثر

  The buffer allocation problem is an NP-hard combinatorial optimization problem, and it is an important design problem in manufacturing systems. The research proposed in this paper concerns a product line consisting ofnunreliable machines withn − 1 buffers and a preventive maintenance policy. The focus of the research is to obtain a better trade-off between the buffer level and the preventive maintenance actions. This paper proposes a dynamic control of the buffers’ level and the interval between two consecutive preventive actions. The set of the parameter of the proposed policy allows choosing the reduction in the costs or the increment of the throughput rate. A simulation model is developed to test the proposed model to the solution proposed in the literature. The proposed policy leads to better results in terms of total costs reduction keeping high production rate, while the design of a fixed level of buffer works better for lower production rates required. تفاصيل المقالة
• حرية الوصول المقاله
  • صفحة الملخص
  • نص كامل
  
  13 - A Multi-objective Leagile Demand-Driven Optimization Model incorporating a Reliable Omnichannel Retailer: A Case Study
  Farnaz Javadi Gargari Zahra Saeidi-Mobarakeh Hossein Amoozad Khalili
  This research proposed a comprehensive model designed for the optimization of supply chain networks, particularly emphasizing leagile demand-driven systems within the context of omnichannel operations. The proposed model integrates various parameters such as total cost, أکثر

  This research proposed a comprehensive model designed for the optimization of supply chain networks, particularly emphasizing leagile demand-driven systems within the context of omnichannel operations. The proposed model integrates various parameters such as total cost, lead time, service level, and residual capacity, addressing the complex interdependencies among an omnichannel environment of retailers. To enhance the model's reliability, a hybrid meta-heuristic algorithm is employed, combining the strengths of MOEA/D-DE (Multi-Objective Evolutionary Algorithm with Differential Evolution), IBEA (Indicator-Based Evolutionary Algorithm), and NSGA-II (Non-dominated Sorting Genetic Algorithm II). The collaborative optimization approach ensures adaptability and efficiency in addressing diverse and intricate optimization challenges inherent in omnichannel networks. The numerical data from a case study on the supply of sanitary masks in Tabriz, Iran, during August 2021 is utilized to validate the model within the specific omnichannel context. The study includes a thorough sensitivity analysis, demonstrating the model's robustness against disturbances in the omnichannel network. The consistent performance of the odel across various disruption scenarios underscores its reliability and efficacy in ensuring the stability of supply chain operations within omni-channel frameworks. This observed resilience significantly enhances the overall robustness of the supply chain, especially when confronted with disruptive events. The model's ability to maintain stability under diverse conditions contributes to fortifying the supply chain against potential disruptions, thereby augmenting its adaptive capabilities in dynamic environments..Managerial and practical implications are discussed, emphasizing the significance of the proposed reliable omnichannel approach in leagile demand-driven systems. تفاصيل المقالة