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    Economic and Environmental Sustainability Performance Improvements in the Outdoor Wood Furniture Industry Through a Lean-Infused FMEA-Supported Fuzzy QFD Approach
    (Mdpi, 2025) Ince, Melike Nur; Arpaci, Emrecan; Tasdemir, Cagatay; Gazo, Rado
    Fiercer competition across all industries has made identifying and eliminating lean wastes to enhance sustainability performance an effective route that many companies take. This study focuses on the production process of wood park/garden benches at a company that manufactures outdoor wood furniture. The goal was to identify lean wastes within a sustainability framework across seven operations and integrate multi-criteria decision making (MCDM) methodologies for waste elimination. Eleven lean KPIs addressing economic and environmental sustainability were used to develop and prioritize 13 lean failure modes (LFMs) with Risk Priority Numbers (RPNs) above 100, leading to lean project proposals for each LFM. Eighteen lean tools were ranked using the Fuzzy Quality Function Deployment (Fuzzy QFD) method. A total of eight improvement propositions, namely, Kaizen and continuous improvement, upgrade machinery for energy efficiency, Just-In-Time (JIT), optimize production processes with lean methodologies, implement cost reduction strategies, Total Productive Maintenance (TPM), Investing in Automation, and Andon were implemented. Significant improvements were observed post-implementation: total lead time was reduced by approximately 38.46%, value-added time by 22.05%, and non-value-added time by 47.64%. The required number of workers decreased by 14.29%, and the total inventory decreased by approximately 57.31%. The results contribute to sustainability goals by reducing energy consumption and waste while increasing economic efficiency. It also provides a robust framework for decision making in fuzzy environments, guiding practitioners and academics in lean management and sustainability.
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    Integrating sustainability into higher education curriculum through a transdisciplinary perspective
    (Elsevier Sci Ltd, 2020) Taşdemir, Cağatay; Gazo, Rado
    Higher education institutions are among the most influential elements of implementing concepts of sustainability and sustainable development. Manufacturing industries of all sorts are key stakeholders, which rely on universities to satisfy the demand for competent workforce. Society also expects universities to educate our youth and contribute to their self-development by achieving both, scientific and intellectual knowledge saturation. Among all these missions, today, universities are trying to develop sustainability curriculums to further increase sustainability awareness and to provide undergraduate students with a toolkit that would provide them with a competitive advantage in the job market. Developing such a curriculum would only be possible with a transdisciplinary approach. Therefore, the objective of this study was to contribute to strategic alignment of higher education institutions and corporate organizations by developing a course curriculum that integrates modern management techniques and sustainability concepts with wood products industry dynamics, which also focuses on project based learning (PBL). Theories of sustainability, lean management, supply chain management, six-sigma, and life cycle analysis were reinforced with hands-on activities of value-added wood product manufacturing line during a 16-weeks course. Students' pre- and post-education awareness of and familiarity with sustainability, potential consequences of ignored sustainability issues, modern management techniques, global trends, innovation waves, and industry evolution were compared through a seventeen-question survey. Results showed that proposed course content was successful at increasing sustainability awareness at both overall and individual sustainability pillar levels. At the end, 100% of students were able to develop complete understanding of various modern management techniques and stated that they feel confident to apply learnt skills to real life issues within their profession upon graduation. The outcomes of the study could serve as a guide for those looking to develop similar interor trans-disciplinary courses at higher education institutions. (C) 2020 Elsevier Ltd. All rights reserved.
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    Lean and Sustainable Supplier Selection in the Furniture Industry
    (Mdpi, 2023) Ince, Melike Nur; Tasdemir, Cagatay; Gazo, Rado
    The furniture manufacturing sector faces intricate challenges in pioneering sustainable supply chains, particularly with lean and sustainable supplier selection. This study focused on integrating key performance indicators (KPIs) associated with lean philosophy and sustainability into multi-criteria decision-making (MCDM) methodologies. The study methodically evaluated 18 criteria spanning economic, environmental, and social dimensions to discern supplier suitability in both leanness and sustainability realms. Through the ENTROPY method, weights were systematically assigned to these criteria. Subsequently, Fuzzy ARAS and Fuzzy TOPSIS methods were adeptly employed to comparatively assess supplier options. Noteworthy findings included the paramount importance of the distance to the customer and labor practices in supplier selection. The quality level, however, carried the least weight, mainly due to comparable performance scores among alternatives. Consistently, Fuzzy ARAS and Fuzzy TOPSIS results converged to pinpoint Supplier 2 as the optimal choice, reflecting its superior Ki and CCi metrics. Central to this research was the introduction of a structured and holistic framework for lean and sustainable supplier selection, a significant leap forward that promises to be an invaluable asset for practitioners and scholars in the furniture industry, supply chain management, multi-criteria decision-making, and policymaking.