فهرس المقالات production systems

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  1 - A Ratio-Based Efficiency Measurement for Ranking Multi-Stage Production Systems in DEA
  Roza Azizi Reza Kazemi Matin
  10.22094/joie.2017.479.0
  Conventional data envelopment analysis (DEA) models are used to measure efficiency score of production systems when they are considered as black boxes and their internal relationship is ignored. This paper deals with a common special case of network systems which is cal أکثر

  Conventional data envelopment analysis (DEA) models are used to measure efficiency score of production systems when they are considered as black boxes and their internal relationship is ignored. This paper deals with a common special case of network systems which is called multi-stage production system and can be generalized to many organizations. A multi stage production system has some stages in which the outputs of each stage are used as the inputs of the next stage to produce the final outputs of the system. Most of the approaches handling multi-stage systems in DEA evaluate efficiency measure of a production system considering the interrelationship between its stages; however, they do not present their ranking or impact of each stage in ranking of a special multi-stage system through comparison with the others. In this paper, considering the series internal structure of the multi-stage systems and their efficiency measure, we propose some new ratio-based DEA models to determine the best and the worst rank of the multi-stage systems over all sets of feasible weights. In order to improve the performance of the whole system, the proposed models are used to recognize the stages with the most important role in the system’s inefficiency. Some numerical examples are presented to illustrate the approach. تفاصيل المقالة
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  2 - Ranking 7Ms Effective Factors in Iranian Production Systems Using Fuzzy AHP
  Amir Amini Alireza Alinezhad
  In order to survive in today's competitive world, organizations are looking to increase their efficiency and effectiveness. Therefore, they should focus on inputs that are more important than the rest of the inputs in their success. This paper aimed at ranking 7Ms (Mana أکثر

  In order to survive in today's competitive world, organizations are looking to increase their efficiency and effectiveness. Therefore, they should focus on inputs that are more important than the rest of the inputs in their success. This paper aimed at ranking 7Ms (Management, Man power, Marketing, Material, Machinery, Methods and Money) and their sub-criteria of production in Iran. By improving manufacturing processes, manufacturing organizations create and establish their added value. The Analytic Hierarchy Process (AHP) is a very popular method in decision making process, and its inner dependence extension is used for cases in which criteria or alternatives are not independent enough. In FAHP, each option severity is displayed by fuzzy numbers in relation to criteria. Therefore, a fuzzy judgment matrix is obtained. In this study, Fuzzy AHP tool has been used to rank these inputs. The results are compared with the ideal ranking results and are examined that how different they are. تفاصيل المقالة
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  3 - Indigenous Sheep Production in Ethiopia: A Review
  M. Mengesha W. Tsega
  Research results and facts of indigenous sheep production were reviewed with the aim of delivering relevant information for the beneficiaries. The common production system used in Ethiopia was the extensive type, which was characterized by small flock sizes and the floc أکثر

  Research results and facts of indigenous sheep production were reviewed with the aim of delivering relevant information for the beneficiaries. The common production system used in Ethiopia was the extensive type, which was characterized by small flock sizes and the flock being periodically devastated by diseases. Some indigenous sheep groups of the country were characterized and their names were designated from their commonest niche areas. There are large variations in phenotypic characteristics of indigenous sheep in the country. Social cultures and beliefs of most of the community have been highly attached and attracted by these morphological variations of indigenous sheep in Ethiopia. Consequently, those sheep endowed with attractive coat-colors have always exceeded market values of their counterparts. There is also a genetic variation between and within sheep populations of the country. Moreover, there is also a generation response for selection. Although indigenous sheep producers have many opportunities, they have also many constraints that affect productivity. It can be concluded that breeding and improved production programs for the local sheep should incorporate the production objectives and trait preferences of the society. Presence of diversified phenotypic appearances of local sheep shows the genetic potential for improvement. Hence, this huge gene pool should be used for improvement through good management and traditional selection together with genomic technology. تفاصيل المقالة
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  4 - Intensification of Rice Production Systems in Southeastern Nigeria: A Policy Analysis Matrix Approach
  Albert I. Ugochukwu Chuma I. Ezedinma
  The Nigerian rice sector has made remarkable improvement in the last decade as production has increased significantly thereby reducing the gap between domestic supply and demand. In the last three decades, rice imports make up greater proportion of Nigerian imports as r أکثر

  The Nigerian rice sector has made remarkable improvement in the last decade as production has increased significantly thereby reducing the gap between domestic supply and demand. In the last three decades, rice imports make up greater proportion of Nigerian imports as rice forms a structural component of the Nigerian diet. Past government inconsistent policies were not successful in securing good market share for domestic rice producers, hence producers suffered great losses. The recent resurgence of interest by the present administration to intensify domestic rice production has yielded positive results. The objective of this study is to analyze and assess the costs and benefits of intensification of rice production systems in southeastern Nigeria using a policy analysis matrix approach. Multi Stage sampling technique was employed in selecting 75 upland and 75 lowland rice farmers who were interviewed with structured and validated questionnaire. Data were analyzed using Policy Analysis Matrix (PAM). The result shows that upland; lowland and double rice cropping systems in southeastern Nigeria are profitable based on the policy analysis matrix (PAM) model, and rice production under various systems and technologies is socially profitable and financially competitive. While there exist comparative advantage in the various production systems, with lowland and double cropping being highest, substantial tax was imposed on rice imports in Nigeria and government investment in intensifying rice production had a positive impact on the output of local rice production. The study concludes with strategies for the development of rice sub sector in Nigeria. تفاصيل المقالة
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  5 - ارائه الگوی سیستم‌های مدیریت هوشمند برای سیستم‌های تولید پایدار و تاب‌آور در صنعت سیمان در راستای بهبود توسعه اجتماعی
  اسحق جمال امیدی محمدعلی کرامتی مهدی رجبیون صفیه مهری نژاد
  در زمینه ارائه الگوی سیستم‌های مدیریت هوشمند برای سیستم‌های تولید پایدار و تاب‌آور در صنعت سیمان در راستای بهبود توسعه اجتماعی، انجام تحلیل‌های متعدد برای انتخاب بهترین الگوریتم‌ها به منظور بهبود عملکرد سیستم‌های مدیریت بسیار حیاتی است. در این تحقیق، یک مسأله مرتبط با ت أکثر

  در زمینه ارائه الگوی سیستم‌های مدیریت هوشمند برای سیستم‌های تولید پایدار و تاب‌آور در صنعت سیمان در راستای بهبود توسعه اجتماعی، انجام تحلیل‌های متعدد برای انتخاب بهترین الگوریتم‌ها به منظور بهبود عملکرد سیستم‌های مدیریت بسیار حیاتی است. در این تحقیق، یک مسأله مرتبط با تولید بر اساس الگوی سیستم‌های مدیریت هوشمند برای سیستم‌های تولید پایدار و تاب‌آور در صنعت سیمان مورد بررسی قرار گرفته است. هدف اصلی این مسأله بهبود سیستم تولید به نحوی است که پایداری به صورت یکنواخت در روند تولید حفظ شود. در این فرآیند تولید، از توزیع پوآسن و اجرای هوش مصنوعی در تولید با توزیع نمایی استفاده می‌شود. همچنین، دو محدودیت اصلی بر روی این مسأله تعیین شده‌اند؛ یکی مرتبط با تعداد کل تولیداتی که ایجاد می‌شوند و دیگری مرتبط با محدودیت حداکثر زمان تولید. این مسأله سه هدف را در نظر دارد. هدف اول، کاهش متوسط میزان انتظار تولید را به عنوان هدف اصلی دارد. هدف دوم، به مینیمم کردن میزان آسیب‌های زیست محیطی در فرآیند تولید می‌پردازد. هدف سوم نیز به ماکزیمم کردن کل کارکرد دستگاه‌ها در واحد زمان پرداخته است. بدین منظور از الگوریتم‌های VIS، CNSGA-II، NSGA-II، MISA، NNIA و NRGA در نرم افزار متلب استفاده شد. الگوریتم VIS در اکثر معیارها، بهترین عملکرد را از خود نشان داد. تفاصيل المقالة