scholarly journals Design and development of a model and optimal planning for supply chain responsibility towards the environment

2021 ◽  
Vol 34 (01) ◽  
pp. 168-185
Author(s):  
Shahram Mokhlesabadi ◽  
Mohammad Reza Kabaranzad Ghadim ◽  
Hasan Ali Aghajani Kasegari ◽  
Mohammad Mahdi Movahedi
Keyword(s):  
Supply Chain ◽  
Reverse Logistics ◽  
Inventory Systems ◽  
Lot Size ◽  
Environmental Implications ◽  
Product Return ◽  
Current Trends ◽  
Joint Economic Lot Size ◽  
Decision Making Processes ◽  
Production Quantity

The responsible management of product return flows in production and inventory environments is a rapidly increasing requirement for companies. This can be attributed to economic, environmental and/or regulatory motivations. Mathematical modeling of such systems has assisted decision-making processes and provided a better understanding of the behavior of such production and inventory environments. This paper reviews the literature on the modeling of reverse logistics inventory systems based on the economic order/production quantity (EOQ/EPQ) and the joint economic lot size (JELS) settings to systematically analyze the mathematics involved in capturing the main characteristics of related processes. The literature is surveyed and classified according to the specific issues faced and modeling assumptions. Special attention is given to environmental issues. There are indications of the need for reverse logistics models' mathematics to follow current trends in ‘greening’ inventory and supply-chain models. The modeling of waste disposal, greenhouse-gas emissions, and energy consumption during production is considered as the most pressing priority for the future of reverse logistics models. An illustrative example for modeling reverse logistics inventory models with environmental implications is presented.

scholarly journals Improving Supply Chain Profit through Reverse Factoring: A New Multi-Suppliers Single-Vendor Joint Economic Lot Size Model

2020 ◽  
Vol 8 (2) ◽  
pp. 23
Author(s):  
Beatrice Marchi ◽  
Simone Zanoni ◽  
Mohamad Y. Jaber
Keyword(s):  
Supply Chain ◽  
Financial Institution ◽  
Theory And Practice ◽  
Lot Size ◽  
Accounts Receivable ◽  
Financial Decisions ◽  
Supply Chain Finance ◽  
Joint Economic Lot Size ◽  
Supply Chain Financing ◽  
Size Model

Supply chain finance has been gaining attention in theory and practice. A company’s financial position affects its performance and survivability in dynamic and volatile markets. Those that have weak financial performance are vulnerable when operating in environments that are uncertain and financially unstable. Companies adopt various solutions and techniques to manage, effectively and efficiently, the flow of money to and from its suppliers and buyers. Reverse factoring is an innovative technique in supply chain financing. This paper develops a joint economic lot size model where a vendor coordinates operational and financial decisions with its multiple suppliers through the establishment of a reverse factoring arrangement. The creditworthy vendor systematically informs a financial institution (e.g., bank) of payment obligations to selected suppliers, enabling the latter to borrow against the value of the relevant accounts receivable at low interest (borrowing) rates. The paper also presents a numerical example and a sensitivity analysis to illustrate the behavior of the model and to compare the economic and operational performance of a supply chain with and without a reverse factoring agreement. The results show that the establishment of a reverse factoring agreement within the supply chain improves the economic performance and impacts on the operational decisions.

The impact of reverse logistics onto green supply chain competitiveness evidence from Serbian consumers

2020 ◽  
Vol 48 (9) ◽  
pp. 1003-1021
Author(s):  
Slobodan Aćimović ◽  
Veljko Mijušković ◽  
Vesna Rajić
Keyword(s):  
Supply Chain ◽  
Reverse Logistics ◽  
Practical Implication ◽  
Perceived Quality ◽  
Green Supply Chain ◽  
Content Type ◽  
Product Return ◽  
Logistics Process ◽  
The Impact

PurposeThe purpose of this paper is to explain what determines the influence of reverse logistics onto green supply chain competitiveness and to find out if that influence is always uniform.Design/methodology/approachThe paper contains an empirical research conducted using a survey-based study, which encompassed a sample size of 228 participants and final consumers that have experience in buying/using products derived from the reverse logistics process.FindingsThe results indicate that the influence of reverse logistics onto green supply chain competitiveness is dependent on the product return option and is mainly negative with Serbian consumers, since the perceived quality of each of the three return options is considered to be inferior compared to new products.Practical implicationThe study's empirical results show the there is a generally negative perception among consumers regarding the perceived quality of each of the three product return options, thus directly questioning the general justification of using reverse logistics in Serbian business practice. That is a sign for Serbian managers to enhance their efforts to raise future awareness of the green initiatives importance among business partners, but also final consumers.Originality/valueThe study`s contribution is twofold: first, it helps to additionally test the established and known methodology created by Hazen et al. (2011), thus contributing to the practical dimension of international comparability concerning consumer perceptions. Second, the study adds to research by addressing the gap in practical surveys regarding the reverse logistics practices.

Heat Transfer Approach to Modelling and Analysis of Reverse Logistics Inventory Models

2011 ◽  
Vol 110-116 ◽  
pp. 2811-2820
Author(s):  
Nasim Nahavandi ◽  
Farzad Haghighi Rad ◽  
Saeed Farokhi
Keyword(s):  
Heat Transfer ◽  
Reverse Logistics ◽  
System Analysis ◽  
Inventory System ◽  
Inventory Systems ◽  
Equivalent Model ◽  
Strong Base ◽  
Modeling And Analysis ◽  
Simulation Tools ◽  
Product Return

Modeling and analysis of inventory systems in reverse logistics is more complex than in forwards logistics, because in reverse logistics not only amount of demand is not clear, but also uncertainty of product return is appeared in the system. In this paper, an inventory system with the possibility of product return is modeled by means of simulation tools and then thermal equivalent of inventory model, using laws of heat transfer is developed. In order to provide the thermal equivalent, components of the inventory system are known and for each component the thermal equivalent is introduced and then sensitivity analysis is used to show the similar behavior of the two models. Hence, analyzing the thermal model can lead us to know the effect of different policies and parameters on inventory system performance. Thermal equivalent model presented in this paper is a strong base for inventory system analysis with more complex structures in future studies.

scholarly journals PENGELOLAAN PERSEDIAAN PADA PT. X DENGAN PERMINTAAN STOKASTIK DAN VARIABEL LEAD TIME

2018 ◽  
Vol 1 (1) ◽  
pp. 30
Author(s):  
Silvi Rushanti Widodo ◽  
Heribertus Budi Santoso
Keyword(s):  
Supply Chain ◽  
Lead Time ◽  
Lot Size ◽  
Joint Economic Lot Size

<p><em>PT. X (pemasok) merupakan suatu perusahaan manufaktur yang bergerak dibidang furniture rotan sintetik. PT. X memiliki permasalahan mengenai pengelolaan persediaan dengan distributornya (pembeli). PT. </em><em>X tidak menggunakan pendekatan sistem apapun untuk mengelola persediaannya saat ini, begitu pula yang dilakukan oleh distributornya. Hal ini tentunya akan menimbulkan permasalahan pada jaringan supply chain karena setiap pelaku bisnis tersebut hanya memikirkan sistem pengelolaan persediaan yang paling menguntungkan bagi dirinya sendiri. Hal ini sangat penting karena dalam suatu jaringan supply chain, keoptimalan pasokan produk pada salah satu pihak belum tentu menjadi optimal bagi pihak yang lain. Hal ini tentunya dapat menimbulkan masalah pada biaya produksi, penentuan jumlah cadangan produk (stock), dan waktu pasokan produk dari jaringan supply chain tersebut sehingga solusi terbaik demi keuntungan bersama akan sulit tercapai. Model Joint Economic Lot Size (JELS) mengintegrasikan pengelolaan persediaan dalam supply chain, Pada model ini pemasok atau produsen akan memproduksi sesuai dengan permintaan pembeli atau konsumen dari permintaannya yang tidak menentu dan hanya berupa kisaran jumlah atau stokastik dengan mempertimbangkan variabel lead time. Perusahaan melakukan pengiriman barang sesuai dengan permintaan konsumen sehingga biaya persediaan hanya optimal bagi salah satu pihak. Besarnya penghematan yang dapat dihasilkan dari metode JELS adalah sebesar 0,51% per tahun.</em></p>

scholarly journals Pengendalian Persediaan Produk Obat Herbal pada Permintaan Probabilistik Menggunakan Joint Economic Lot Size

2019 ◽  
Vol 8 (1) ◽  
pp. 39-46
Author(s):  
Rainisa Maini Heryanto ◽  
Yosi Thedi Setiawan ◽  
Vivi Arisandhy
Keyword(s):  
Supply Chain ◽  
Inventory Control ◽  
Lot Size ◽  
Inventory Cost ◽  
Integration Model ◽  
Joint Economic Lot Size ◽  
Calculation Process ◽  
Total Inventory ◽  
The Difference ◽  
Is Integration

Integration in supply chain is an important factor to consider. Good integration between entity in supply chain can give some advantages from minimize cost to competitiveness between supply chain.  Company X is manufacturer of herbs medicine which has single distributor to sell the product. Currently, manufacturer and distributor have their inventory control policies and there is no coordination among echelon. It causes the difference number of production lot from manufacturer and the number of order from distributor, consequently total inventory cost become expensive.This research will propose Joint Economic Lot Size (JELS) method that can integrate these two echelons and will give the minimum total inventory cost. The proposed JELS method is integration between Cardenas-Barron model about EPQ backorder and Ben-Daya and Hariga model about integration model between single supplier and single consumer. Calculation process begin with forecasting demand, calculation of actual inventory control at echelon manufacturer and distributor, and calculation of proposed method. The result of calculation process show that total actual inventory cost is 5.500.371,476 IDR/month and the proposed method give 4.604.766,665 IDR/month. The proposed method can give saving about 895.604,811 IDR/month or 16,28%.                      Key words: cost, integration, JELS, inventory

Research on the Double Source Stock Control for a Manufacturer Based on EPR

2014 ◽  
Vol 962-965 ◽  
pp. 3071-3075
Author(s):  
Li Wei Xu ◽  
Fu Cai Wan ◽  
Yu E Fan
Keyword(s):  
Supply Chain ◽  
Reverse Logistics ◽  
Closed Loop ◽  
Closed Loop Supply Chain ◽  
Business Decisions ◽  
Economic Production Quantity ◽  
Economic Production ◽  
Forward Logistics ◽  
Production Quantity ◽  
Production Period

With the widely acception of extended producer responsibility system, reverse logistics has attracted more and more attention. For manufacturers, reverse logistics activities is not inseparable to the general forward logistics, and they constitute the closed-loop supply chain. Decision makers of enterprises need to control the new products inventory and the recovered materials inventory to make the enterprises get the maximum profit.In this paper,the inventory characteristics under the closed-loop supply chain be analyzed and a inventory model for a single repair period, many production period is proposed .On condition that the number of recovery is controlled by the recycling price and is equal in different cycles,the recovered products can be sold as new.A economic production quantity and recycling price can be solved to make the total cost of a single cycle lowest ,which provides a basis for business decisions.

Research on Mode of after-Sale Reverse Logistics Operation of Auto Maintenance Industry Based on Time Window

2011 ◽  
Vol 121-126 ◽  
pp. 4635-4639
Author(s):  
Hao Hao ◽  
Xing Gen Wu ◽  
Hong Yu Li
Keyword(s):  
Supply Chain ◽  
Reverse Logistics ◽  
High Speed ◽  
Time Window ◽  
Auto Industry ◽  
Road Transport ◽  
Motor Vehicles ◽  
Safety Testing ◽  
Internal Operations ◽  
Evaluation Mechanism

The author maintains that, with the quick development of domestic auto industry, the auto maintenance industry is progressing with high speed accordingly. The auto maintenance enterprise are inclined to focus on sales and forward supply chain operation, however, lacking of efficient resource and systematic management into reverse logistics operation, as lead to a few potential risks. In order to avoid and control the risks, the auto maintenance companies need to closely cooperate with channel supply chain partners, meanwhile build up the mode of reverse logistics operation with timing efficiency orientation. This mode consists of eight sub-system modules: organization structure, network planning and layout, reverse logistics operation procedure, time window evaluation mechanism, automatic replenishment system, reverse forecasting system, Kan-ban message system as well as disposal & reuse system. Furthermore, the article makes analysis of the internal operations and external relevance of these eight sub-systems. In recent years, with the overall opening up of road transport market and the rapid growth in domestic economy, the total number of China’s motor vehicles is entering a high-speed growth channel, and “the car goes to the country” policy further promotes the auto industry. Under the situation of quick development, the auto maintenance industry is developing by 10% to 15% each year as a young profession. According to the statistics, there are over 380,000 auto maintenance enterprises in our country at the moment, and various types of auto safety testing stations are built around one after another. The intense competition among auto maintenance manufacturing enterprises does not only focus on product quality, but also on the after-market reverse logistics. According to the statics of Gartner, 70 percent of resale is related with sales service, and 60 percent of resale is related with after market. However, except for few leading business enterprises which have realized the direct influence and value contribution of after-service reverse logistics to profit increase and customer loyalty and take action to pioneer the profit territory in the after-sale reverse logistics, the ‘price war’ is still the main competition method which the majority of enterprises adopt in the market.

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