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نتیجه جستجو - Production quantity

تعداد مقالات یافته شده: 9
ردیف عنوان نوع
1 Production decisions of a closed-loop supply chain considering remanufacturing and refurbishing under government subsidy
تصمیمات تولید یک زنجیره تامین حلقه بسته با توجه به بازسازی و نوسازی تحت یارانه دولت-2021
Remanufacturing and refurbishing, as two essential strategies in the sector of reverse logistics, play a vital role in the area of sustainable development. With the increasing concerns on the environment friendly supply chain by the general public, we construct two remanufacturing models dominated by the original equipment manufacturer (OEM) and the independent remanufacturer (IR) based on the auto parts market which provides new products, remanufactured products and refurbished products. Considering the remanufacturing subsidy and the market environment parameters, we analyze the full-remanufacturing and partial-remanufacturing using the Stackelberg and Cournot duopoly game models. We then obtain the equilibrium strategies for each of these scenarios. We further carry out sensitivity analysis for the two remanufacturing models and investigate the impact of the remanufacturing subsidy on these two models. The findings in this paper enable us to compare the remanufacturing modes and show how the equilibrium outcome depends on the key model parameters. In the comparison and numerical analysis, they are revealed that (i) the improvement on the quality level of the refurbished products is always unfavorable to the quality level and the production quantity of both the new and the remanufactured products, especially in the OEM remanufacturing model; (ii) subsidy is ineffective in the IR remanufacturing mode when the remanufacturing cost is low; (iii) the IR remanufacturing outperforms the OEM remanufacturing in both economic benefits and social welfare, when the cost of remanufacturing and the customer willingness to pay for remanufacturing products are low, and the quality of refurbished products is high. These findings have potential implications for enterprise remanufacturing production and government policy-making in complex market environments.
Keywords: Remanufacturing | refurbishing | quality level | government subsidy | game model
مقاله انگلیسی
2 Supply chain coordination under vendor managed inventory-consignment stocking contracts with wholesale price constraint and fairness
هماهنگی زنجیره تامین تحت قراردادهای فروش مدیریت شده امانتی سهامی با محدودیت و مساعدت قیمت عمده فروشی-2018
In the retailing industry, dominant retailers usually set constraints on a suppliers wholesale price and obtain most of the supply chain profit. This unfair profit allocation may cause bankruptcy of small suppliers due to low margins. This paper investigates the supply chain coordination under a vendor managed inventory-consignment stocking contract with wholesale price constraint and fairness considerations. First, we derive the retailers optimal wholesale price constraint (WPC) and the suppliers optimal production quantity. Then, we derive the supply chain coordination condition by considering the fairness of profit allocation between the retailer and the supplier. Our analyses show that increasing the fairness preference not only restricts the retailers utility function and WPC, but also increases the suppliers expected profit and production quantity. Furthermore, supply chain coordination can be achieved only when the retailer has a large fairness preference. Through a simulation study of multiple-period decision-making problems, we illustrate the benefits and motivation for the retailer to consider fairness in profit allocation when production cost and market demand are uncertain.
keywords: Supply chain coordination |Wholesale price constraint |Fairness |VMI-CS contract
مقاله انگلیسی
3 Joint pricing and production decisions with yield uncertainty and downconversion
قیمت گذاری مشترک و تصمیمات تولید با عدم قطعیت بهره و تبدیل رو به پایین-2018
We consider a firm who supplies two types of products: high-end and low-end. Because of the uncertainty in the production process, the yield rate of the high-end products is uncertain. The substandard high-end products caused by the yield uncertainty can be transformed into the low-end products with a certain cost. We characterize the optimal pricing and production decisions and develop an algorithm to compute the optimal solution. We also investigate the impact of the yield uncertainty on the firms performance, and explore how stability of market demand, emergent fulfillment costs, and downconversion cost influence this effect. We find that (i) the profit of the firm deteriorates when the risk of the yield uncertainty is high. In the face of yield uncertainty, the firm prefers to decrease (increase) the production quantity of the high-end (low-end) products; (ii) when the market demands are quite unstable, the emergent fulfillment costs are low, or the downconversion cost is high, the firm has a low incentive to eliminate the yield uncertainty.
keywords: Yield uncertainty |Downconversion |Pricing
مقاله انگلیسی
4 The effects of contractual agreements on the economic production quantity model with machine breakdown
تاثیرات توافقات قراردادی روی مدل مقدار تولید اقتصادی با خرابی ماشینی-2018
This paper develops a production-inventory model which is subject to breakdowns, and studies the influence of outsourcing on the expected total cost and the fill rate in case of any failure in the production facility. To avoid shortages and aim at a higher fill rate when there are random breakdowns, the manufacturer has the option to purchase some quantities from an external supplier while repairing the production facility. In this paper, this transaction is formulated through different settings. First, the manufacturer has the option to purchase the items from an available supplier in the market. The manufacturer is also given the option to procure the required items from a predetermined supplier based on a contractual agreement. These scenarios are then compared with the setting in which the manufacturer keeps safety stock in case of breakdown. The results of this study show that using an external supplier, when the machine is prone to failures, improves the performance of the system. We have also shown that it is more beneficial for the manufacturer to collaborate with an external supplier rather than keep safety stock. The analysis is further elaborated using several numerical experiments.
keywords: Machine failure |Fill rate |Imperfect production |Economic production quantity
مقاله انگلیسی
5 Technical note: Solving inventory models by algebraic method
یادداشت فنی: حل مدلهای انبارداری توسط روش جبری-2018
We consider the open question raised by Chang et al. (2005) to solve the EOQ and EPQ inventory models without referring to calculus. Lau et al. (2016) and Chiu et al. (2017) both extended this open question by deriving criterion for the existence and uniqueness of the interior minimum solution but they used analytical techniques that are related to calculus. Moreover, their derivations are incomplete and contained questionable results. In this note, we only used algebraic approach for their extended open question.
keywords: Inventory model |Economic order |Production quantity |Shortage
مقاله انگلیسی
6 یادداشت فنی: حل مدلهای انبارداری توسط روش جبری
سال انتشار: 2018 - تعداد صفحات فایل pdf انگلیسی: 4 - تعداد صفحات فایل doc فارسی: 15
ما سوالِ باز مطرح شده توسط چانگ و همکاران (2005) را برای حل مدلهای انبارداری EOQ و EPQ بدون مراجعه به حساب دیفرانسیل مدنظر قرار می دهیم. لائو و همکاران (2016) و چیو و همکاران (2017) هردو این سوال باز را ازطریق معیار مشتق گیری برای وجود و منحصر به فرد بودن راه حل درونی مینیمم بسط داده اند اما از روشهای تحلیلی استفاده کرده اند که به حساب دیفرانسیل مربوط می شوند. به علاوه، مشتق گیری های آنها ناقص است و حاوی نتایج بحث برانگیزی می باشد. در این یادداشت، ما فقط از دیدگاه جبری برای سوال باز بسط یافته آنها استفاده می کنیم.
کلیدواژه ها: مدل انبارداری | سفارش اقتصادی | مقدار تولید | کمبود
مقاله ترجمه شده
7 Integrated tech-paradigm based innovative approach towards ecological coal mining
مجتمع تکنولوژی پارادایم بر اساس رویکرد نوآورانه نسبت به معدن زغال سنگ زیست محیطی-2018
Coal mining technology directly affects coal production quantity and quality, which in turn affects global energy supplies, especially in rapidly urbanizing, industrializing economies. In this research, a coal production technological diffusion mathematical model is proposed, the results from which indicated that while total coal production is expected to decline in the following decades, coal will continue to provide a sizable share of global prime energy to meet the expected energy demands. A general data analysis was conducted to fully understand coal mining technological paradigmatic development and future necessary improvements to ensure more efficient, environmentally-friendly coal production. It was found that the coal mining technological paradigm followed a three-stage trajectory; competition, diffusion, and shift; in accordance with the traditional technological paradigm S-curve, and underground coal gasification (UCG) related technologies were identified as the main development direction for coal mining technologies. An integrated energy exploitation approach for ecological coal mining was then designed to deal with current environmental and energy returns on investment problems, to improve performance, and to act as a foundation for future UCG technological developments. Some policy rec ommendations are given to guide the implementation of the proposed ecologically oriented integrated coal mining system.
Keywords: Ecological coal mining ، Literature mining ، Technological paradigm ، Sustainable development ، Coal mining technology
مقاله انگلیسی
8 Supply risk sharing in a closed-loop supply chain
اشتراک گذاری ریسک در زنجیره تامین حلقه بسته-2017
In closed-loop supply chains, the acquisition process of used products or materials often faces high volatility and results in both the uncertain quantity and quality of the recycled products. Such supply uncertainties happen in the reverse supply chain flows while the forward supply chain still faces market demand uncertainty. Managing these uncertainties while coordinating the reverse and forward supply chain flows is one of the many challenges faced by CLSC managers. Among different supply chain management approaches, supply chain contract design has been proven as an effective method for improving supply chain performance. Based on the supply chain contract design theories and focusing on the acquisition process in closed-loop supply chains, this paper analyzes different supply risk sharing contracts including under-supply risk sharing contract, over-supply risk sharing contract, complete supply risk sharing contract, and no risk sharing contract. With game-theoretical models, equilibrium between the recycling price decision (controlling the reverse flow) and the remanufacturing quantity decision (controlling the forward flow) are derived and analyzed. Further, numerical examples are used to demonstrate the managerial results. Based on both the theoretic results and the numerical example illustration, it is shown that different supply risk sharing contracts may result in both the recycling price decision and the remanufacturing production quantity decision to deviate from those decisions under centralized collection structure. Further, this paper investigates the impact of supply or demand risk reduction on the CLSCs financial and environmental performances. It is observed that supply risk reduction approaches may result in the alignment between the CLSCs financial and environmental goals while the demand risk reduction approaches cannot achieve such alignment.
Keywords: Closed-loop supply chain | Supply risk sharing contracts |Acquisition management
مقاله انگلیسی
9 ترکیب یک مرکز تعمیر و نگهداری M / M / C / m به تولید مدل مقدار اقتصادی ، با ضعف و تعمیر دستگاه استوکستیک
سال انتشار: 2012 - تعداد صفحات فایل pdf انگلیسی: 11 - تعداد صفحات فایل doc فارسی: 34
این مقاله یک سیستم تولید m با ماشین آلات یکسان و نحوه تولید غیر یکسان محصولات در نرخ تولید آن را بررسی خواهیم کرد . محصولات ساخته شده توسط هر دستگاه در جهت مصرف خاص بر طبق نرخ تقاضا هستند . ممکن است ماشین آلات تحت تاثیر ضعف های ناخواسته ای قرار بگیرند . خراب شدن ماشین آلات به یک توزیع پواسون با نرخ برابر هستند که ماشین آلات خراب شده از سرویس دهنده C برای تعمیر به مرکز تعمیر و نگهداری ارسال می شوند . با این حال، تعداد ماشین آلات بیشتر از مراکز تعمیر است (M> C). از این رو، اگر تعداد ماشین آلات خراب شده بیشتر از مرکز تعمیر باشد ، ماشین آلات در یک صف قرار داده می شود. ماشین آلات در یک صف با سفارش FCFS قرار می گیرند. صف دارای M / M / C / M سیستم معمولی است. اگر ماشین ها در طول تولید خراب شوند ، کمبود پیش خواهد آمد. این مشکل در به دست آوردن یک چرخه تولید تنها برای ماشین آلات تعداد بهینه از سرور با هدف به حداقل رساندن هزینه در نظر گرفته شده است. برای این منظور، توزیع زمان انتظار برای ماشین آلات در مرکز تعمیر محاسبه شده است و یک تابع هزینه تشکیل شده است. روش های مستقیم جستجو در این کار برای به دست آوردن چرخه تولید و تعمیر و نگهداری سرورهای مطلوب استفاده می شود. روشهای پیشنهادی با استفاده از یک مثال جامع مورد مطالعه قرار گرفته اند.
کلمات کلیدی: مدل کمیت تولید اقتصادی (EPQ) | سیستم صف بندی | تعمیر و نگهداری | چرخه تولید بهینه
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