Optimization of reverse logistics network of End of Life Vehicles under fuzzy supply: A case study for Istanbul Metropolitan Area

Recycling aims at preventing rapid depletion of natural resources while transforming produced waste into value for economy. However, this process becomes a major challenge in automotive industry, which requires cooperative engagement of multiple players within a complex supply chain. In line with the essence of the topic, government agencies around the world issue directives drawing regulatory frameworks for designing recycling operations comprising various activities such as collection of end-of-life vehicles (ELVs), recovery of reusable components, shredding ELV's body, recycling valuable materials and disposal of the hazardous waste. In general, the amount of returned product in a reverse logistics network is highly uncertain, and the ELV market in Turkey is no exception to this. For that purpose, this study aims developing a fuzzy mixed integer location-allocation model for reverse logistic network of ELVs conforming to the existing directives in Turkey. Accordingly, this study uses a novel approach and assumes that ELV supply in the network is uncertain. The merit of the proposed mathematical model is proved on a real world scenario addressing the reverse logistics design problem for ELVs generated in metropolitan area of Istanbul. The network generated specifies that recycling process is not profitable under the existing circumstances with the given level of supplied ELV and the returned product records per capita in Istanbul are far beyond the EU averages. Consequently, sensitivity analyses question the reliability of the obtained results.WOS:0004593583000882-s2.0-8506018772

THEORETICAL FRAMES FOR DESIGNING REVERSE LOGISTICS PROCESSES

Logistics processes of return flow became more and more important in present business practice. Because of better customer satisfaction, environmental and financial aspects many enterprises deal with reverse logistics performance. The paper is a literature review focused on the design principles of reverse logistics processes Keywords: reverse logistics, designing.reverse logistics, designing

A Methodology for Assessing Eco-efficiency in Logistics Networks

Recent literature on sustainable logistics networks points to two important questions: (i) How to spot the preferred solution(s) balancing environmental and business concerns? (ii) How to improve the understanding of the trade-offs between these two dimensions? We posit that a complete exploration of the efficient frontier and trade-offs between profitability and environmental impacts are particularly suitable to answer these two questions. In order to deal with the exponential number of basic efficient points in the frontier, we propose a formulation that performs in exponential time for the number of objective functions only. We illustrate our findings by designing a complex recycling logistics network in Germany.Eco-efficiency;Environmental impacts;Profitability;Recycling logistics network

Overview and classification of coordination contracts within forward and reverse supply chains

Among coordination mechanisms, contracts are valuable tools used in both theory and practice to coordinate various supply chains. The focus of this paper is to present an overview of contracts and a classification of coordination contracts and contracting literature in the form of classification schemes. The two criteria used for contract classification, as resulted from contracting literature, are transfer payment contractual incentives and inventory risk sharing. The overview classification of the existing literature has as criteria the level of detail used in designing the coordination models with applicability on the forward and reverse supply chains.Coordination contracts; forward supply chain; reverse supply chain

A Conceptual Framework of Reverse Logistics Impact on Firm Performance

This study aims to examine the reverse logistics factors that impact upon firm performance. We review reverse logistics factors under three research streams: (a) resource-based view of the firm, including: Firm strategy, Operations management, and Customer loyalty (b) relational theory, including: Supply chain efficiency, Supply chain collaboration, and institutional theory, including: Government support and Cultural alignment. We measured firm performance with 5 measures: profitability, cost, innovativeness, perceived competitive advantage, and perceived customer satisfaction. We discuss implications for research, policy and practice

Penilaian kualiti persekitaran dalaman (IEQ) bangunan Akademik Institusi Pengajian Tinggi Awam (IPTA) Malaysia dalam konteks pengurusan fasiliti

Kualiti Persekitaran Dalaman atau Indoor Environmental Quality (IEQ) merupakan komponen penting dalam konteks bangunan mesra alam yang akan menentukan tahap kualiti penghuni di dalam sesebuah bangunan. Secara purata dianggarkan 80% kehidupan seharian manusia adalah berada di dalam bangunan. Ketidakseimbangan IEQ menyumbang kepada Sindrom Bangunan Sakit (Sick Building Syndrome) sekali gus memberi kesan kepada produktiviti para penghuni juga kepada struktur bangunan. Sehubungan itu, kajian ini dilaksanakan untuk mengenal pasti tahap kesedaran pihak pengurusan harta dan fasiliti di Institusi Pengajian Tinggi Awam (IPTA) terhadap IEQ dalam konteks bangunan akademik. Kajian ini juga bertujuan untuk mengukur tahap IEQ dan tahap kepuasan pengguna dalam bangunan akademik di IPTA. Kajian ini melibatkan bangunan akademik di 20 IPTA di Malaysia. Metodologi kajian ini menggunakan pendekatan kualitatif, kajian saintifik dan juga pendekatan secara kuantitatif. Pendekatan Kualitatif digunakan bagi menilai tahap kesedaran pihak pengurusan harta dan fasiliti IPTA melalui proses temubual yang melibatkan 20 orang responden. Manakala pendekatan kedua adalah melalui kajian saintifik ke atas bangunan akademik yang memfokuskan kepada pengukuran elemen keselesaan terma, keselesaan bunyi, kualiti udara dalaman dan pencahayaan. Hasil pengukuran elemen tersebut dibandingkan dengan piawaian dari Malaysia Standard (MS 1525;2007) dan UNESCO. Bagi setiap IPTA, lima buah bilik kuliah dijadikan sampel dengan tiga kali bacaan setiap hari selama dua hari diperolehi bagi mendapatkan bacaan purata. Seterusnya, melalui pendekatan kuantitatif, data yang diperolehi melalui kaji selidik melibatkan 500 responden dan dianalisis menggunakan perisian Statistical Package for Social Science (SPSS). Hasil kajian menunjukkan kesedaran para pengurus harta dan fasililti di IPTA terhadap IEQ adalah baik tetapi masih ada beberapa kelemahan yang perlu ditambahbaik. Hasil ujian saintifik yang diperolehi menunjukkan bacaan bagi suhu dalaman, hanya UniSZA, UTHM dan UniMAS yang menepati piawaian, manakala bagi pencahayaan, UM, UIAM, UPSI, USM, UniSZA, UTM, UTHM, UTeM, UMS dan UniMAS berada di bawah tahap piawaian ditetapkan. Bagi keamatan bunyi, hanya UM, UPM, UPSI, USM dan UniMAP yang menunjukkan bacaan pada piawaian ditetapkan. Keseluruhannya menunjukkan bacaan berada pada tahap yang sederhana dan masih lagi memerlukan pernambahbaikan. Kajian ini turut mempamerkan bacaan purata bagi setiap elemen IEQ bagi bangunan akademik seluruh IPTA. Penemuan hasil kajian ini dijangka dapat membantu pihak pengurusan harta dan fasiliti IPTA dalam usaha menambahbaik tahap IEQ dalam bangunan akademik di kampus universiti sekaligus dapat meningkatkan tahap pengurusan fasiliti dalam mencapai tahap kelestarian kampus IPTA di Malaysia

Reverse logistics - a framework

In this paper we define and compare Reverse Logistics definitions. We start by giving an understanding framework of Reverse Logistics: the why-what-how. By this means, we put in context the driving forces for Reverse Logistics, a typology of return reasons, a classification of products, processes and actors. In addition we provide a decision framework for Reverse Logistics and we present it according to long, medium and short term decisions, i.e. strategic-tactic-operational decisions.Framework;Decision-making;Reverse logistics;Theory building

Design of Closed Loop Supply Chains

Increased concern for the environment has lead to new techniques to design products and supply chains that are both economically and ecologically feasible. This paper deals with the product - and corresponding supply chain design for a refrigerator. Literature study shows that there are many models to support product design and logistics separately, but not in an integrated way. In our research we develop quantitative modelling to support an optimal design structure of a product, i.e. modularity, repairability, recyclability, as well as the optimal locations and goods flows allocation in the logistics system. Environmental impacts are measured by energy and waste. Economic costs are modelled as linear functions of volumes with a fixed set-up component for facilities. We apply this model using real life R&D data of a Japanese consumer electronics company. The model is run for different scenarios using different parameter settings such as centralised versus decentralised logistics, alternative product designs, varying return quality and quantity, and potential environmental legislation based on producer responsibility.supply chain management;reverse logistics;facility location;network design;product design