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RISS 인기검색어
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- 저자 : Moshtagh, (검색결과 4 건)
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Taleizadeh, Ata A.,Moshtagh, Mohammad S.,Moon, Ilkyeong Inderscience Enterprises Ltd. 2017 European journal of industrial engineering Vol.11 No.4
<P>Over the last few decades, the closed loop supply chain (CLSC) has been examined because of concerns over the environment and social liability. In this paper, we propose a joint optimisation model of pricing strategies, quality levels, effort decisions, and return policies by considering the reference price effect in a three-level supply chain under different channel power structures. To investigate the impact of different scenarios on optimal decisions and performance of a CLSC, we address five different channel power structures: centralised, vertical Nash, manufacturer Stackelberg, retailer Stackelberg, and third party Stackelberg. We present a numerical example to demonstrate the theoretical results of the developed model, and we also compare the optimal decisions to determine the best channel power structures considered. Then, to examine the impact of the key parameters on the model's behaviour, we conduct a sensitivity analysis on the main parameters, and finally, we provide a conclusion.</P>
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Effects of deviation in materials' strengths on the lateral strength and damage of RC frames
Massumi, Ali,Sadeghi, Kabir,Moshtagh, Ehsan Techno-Press 2018 Structural Engineering and Mechanics, An Int'l Jou Vol.68 No.3
The real behavior of the RC structures constructed based on the assumed specifications of the used materials is matched with the designed ones when the assumed and the applied specifications in construction are the same. Despite in the construction phase of the reinforced concrete (RC) structures always it is tried to implement the same specifications of materials as given in the executive drawings, but considering the unpredicted/uncontrolled parameters that affect the specification of materials, always there is a deviation between the constructed and the designed materials' specifications. The objective of this paper is to submit a guideline for the evaluation of the strength and damage to the existing RC structures encountered deviation in materials' strengths. To achieve this goal, the lateral strength (plastic behaviors) and damage to twenty-five RC moment-resisting frames (MRFs) are studied by applying the inelastic analysis. In this study, a couple of concrete and reinforcement strengths' deviations are investigated. The obtained results indicate that in general, there is a semi-linear relationship between the deviation in the strength of reinforcement and the changes in the lateral strength values of the MRFs. The relative effect of the deviation in the strength of reinforcements is more than the relative effect of the deviation in the concrete strength on the damage rate. The obtained results could be a guideline for the engineers in the survey of the existing buildings encountered deviation in materials' strengths during their construction phase.
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Taleizadeh, Ata Allah,Moshtagh, Mohammad Sadegh,Moon, Ilkyeong Elsevier 2018 Journal of cleaner production Vol.189 No.-
<P><B>Abstract</B></P> <P>In recent years, recycling and remanufacturing functions have received increased attention because of strict environmental concerns and regulations. The aim of this paper is to investigate the pricing strategies as well as the quality level and effort decisions of the manufacturer, retailer, and third party operating in two types of closed-loop supply chains: (1) single-channel forward supply chain with a dual-recycling channel (SD model) and (2) dual-channel forward supply chain with a dual-recycling channel (DD model). On the basis of these different channel structures, two manufacturer Stackelberg game models are developed to explore the best values for prices, quality levels, and sales and collection efforts. In addition, to draw managerial insights, corresponding equilibrium solutions of the two model structures are determined and compared, and the channel structure that most benefits each supply chain member is examined. To reduce channel conflicts and increase each channel member’ profits, a novel coordination mechanism is introduced and discussed. Two numerical examples are presented to simulate the strategies for choosing the best channel format for a decentralized closed-loop supply chain and examine the effectiveness of the coordination contract. The results revealed that the DD model is the best for the manufacturer, and the optimal channel structure for the retailer depends on the retailer's market share. However, by applying a novel coordination mechanism, all three members of a closed-loop supply chain can benefit from the introduction of an online selling channel. Furthermore, the results showed that the quality of products in the DD model is always greater than it is for products in the SD model. Moreover, it is observed from the sensitivity analysis that the recycling channel member with a predominant market share exerts greater collections effort and offers lower buyback prices than others in the collection channel.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The selling, cross, and buyback prices, and quality of products in a CLSC are investigated. </LI> <LI> The incorporation of collection effort into product-return quantity expansion is investigated. </LI> <LI> Two two-level structures (SD & DD model) are studied and the best one is determined. </LI> <LI> DD model is the best for the manufacturer, and it may also be the best for the retailer. </LI> <LI> When market share is less than threshold, retailer earns more profit through SD model. </LI> </UL> </P>
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Effects of deviation in materials’ strengths on the lateral strength and damage of RC frames
Ali Massumi,Kabir Sadeghi,Ehsan Moshtagh 국제구조공학회 2018 Structural Engineering and Mechanics, An Int'l Jou Vol.68 No.3
The real behavior of the RC structures constructed based on the assumed specifications of the used materials is matched with the designed ones when the assumed and the applied specifications in construction are the same. Despite in the construction phase of the reinforced concrete (RC) structures always it is tried to implement the same specifications of materials as given in the executive drawings, but considering the unpredicted/uncontrolled parameters that affect the specification of materials, always there is a deviation between the constructed and the designed materials’ specifications. The objective of this paper is to submit a guideline for the evaluation of the strength and damage to the existing RC structures encountered deviation in materials’ strengths. To achieve this goal, the lateral strength (plastic behaviors) and damage to twenty-five RC moment-resisting frames (MRFs) are studied by applying the inelastic analysis. In this study, a couple of concrete and reinforcement strengths’ deviations are investigated. The obtained results indicate that in general, there is a semi-linear relationship between the deviation in the strength of reinforcement and the changes in the lateral strength values of the MRFs. The relative effect of the deviation in the strength of reinforcements is more than the relative effect of the deviation in the concrete strength on the damage rate. The obtained results could be a guideline for the engineers in the survey of the existing buildings encountered deviation in materials’ strengths during their construction phase.
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