Nikolaos A. Panayiotou

Dr. Nikolaos A. Panayiotou

School of Mechanical Engineering, National Technical University of Athens, GR15780 Athens, Greece
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Research Focus & Metrics

Academic Career Length

25Years (2002-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

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20 December 2008 in Water, Air, & Soil Pollution: Focus
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Nikolaos A. PanayiotouNikolaos A. Panayiotou
Nikolaos A. Panayiotou
Konstantinos AravossisKonstantinos Aravossis
Konstantinos Aravossis
PMPeggy Moschou
Peggy Moschou

15 October 2024 in Foods
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Evripidis KechagiasEvripidis Kechagias
Evripidis Kechagias
Sotiris GayialisSotiris Gayialis
Sotiris Gayialis
Nikolaos A. PanayiotouNikolaos A. Panayiotou
Nikolaos A. Panayiotou
Georgios PapadopoulosGeorgios Papadopoulos
Georgios Papadopoulos
This paper addresses the critical and urgent need to reduce food losses and waste (FLW) resulting from stringent marketing standards. It proposes a comprehensive and actionable framework grounded in the three pillars of sustainability—environmental, economic, and social—to effectively evaluate FLW across the entire food supply chain. The paper involves a thorough review of existing marketing standards, including research on FLW due to marketing standards, and proposes the implementation of targeted key actions within four key food sectors: fruits, vegetables, dairy, and cereals. The study provides a detailed analysis of the significant impact marketing standards have on FLW at various stages of the supply chain, including primary production, processing, retail, and consumption. By focusing on these critical points, the research underscores the necessity of addressing marketing standards to achieve meaningful reductions in FLW. The proposed framework aims to foster improved business practices and drive the development of innovative, sector-specific solutions that balance sustainability goals with economic viability. The holistic approach followed for this research lays the foundation for ensuring that the proposed framework is adaptable and practical, leading to measurable improvements in reducing FLW and promoting sustainability across the food industry.

3 June 2021 in International Journal of Quality & Reliability Management
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Nikolaos A. PanayiotouNikolaos A. Panayiotou
Nikolaos A. Panayiotou
KSKonstantinos E. Stergiou
Konstantinos E. Stergiou
NPNikolaos Panagiotou
Nikolaos Panagiotou
Purpose: The purpose of this paper is the implementation of Lean Six Sigma (LSS) in a manufacturing small and medium-sized enterprise (SME) in Greece in order to understand the contribution of LSS in its process improvement and to identify the parameters playing a crucial role in LSS adoption by SMEs. The ability to achieve high-effect improvements without cost investment is also examined to cope with low investment margin that is a characteristic of SMEs.Design/methodology/approach: This case study is based on the combination of Define, Measure, Analyze, Improve and Control (DMAIC) phases with the Yin's method for case studies for a complete and efficient implementation and presentation of the project.Findings: The analysis of this case study revealed that by accomplishing specific critical success factors for the fulfillment of the LSS project, the company attained important benefits by utilizing only the working hours of employees. It was also found that the improvements of LSS projects can be measured using other metrics which can indirectly be translated into monetary terms.Practical implications: The paper can be a useful guide of how SMEs can achieve high-impact improvements with low or no investment cost utilizing LSS initiatives in small-scale projects.Originality/value: According to the literature, there is a need for more case studies concerning LSS implementation in SMEs. Examples of how low-cost/high-effect improvement initiatives can be implemented have not been adequately presented before. The assessment of the impact of improvement initiatives with non-monetary measures is also innovative.

17 September 2022 in Sustainability
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Sotiris GayialisSotiris Gayialis
Sotiris Gayialis
Evripidis KechagiasEvripidis Kechagias
Evripidis Kechagias
Georgios PapadopoulosGeorgios Papadopoulos
Georgios Papadopoulos
Nikolaos A. PanayiotouNikolaos A. Panayiotou
Nikolaos A. Panayiotou
Traceability is among the most significant challenges in supply chains, where multiple stakeholders and activities are involved in the production and distribution of products. No supply chain can become sustainable without effectively addressing the problem of traceability by recognizing, monitoring, and implementing all necessary activities of the processes. This research provides a reference model for effective wine supply chain traceability and is part of a research project for the development of a blockchain-enabled traceability system. The reference model not only depicts processes but also covers all views that are necessary for achieving the whole picture of an effective traceability system. These views include the value chain, organizational resources, functions, processes, systems, data, and risks that are related to wine production and distribution. The reference model has a strong contribution to practice and research as it pertains to bridging the barrier between developers and users while also offering significant research outcomes. The research output is the reference model that includes standard wine traceability processes and all necessary data for effective wine supply chain traceability. The results of this research will be used for creating the traceability system’s specifications and ensuring that it will be effectively designed and implemented. The reference model can also be used for the implementation and adaptation of the traceability system to the stakeholders of the wine supply chain.

8 August 2019 in Transforming Government: People, Process and Policy
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Nikolaos A. PanayiotouNikolaos A. Panayiotou
Nikolaos A. Panayiotou
VSVasileios Stavrou
Vasileios Stavrou
Purpose: This paper aims to construct an assessment framework to establish a maturity model for Web Electronic Services offered at a local government level and investigate the maturity of Greek municipalities in the E-Government field, trying to correlate how this is affected by demographic variables. Design/methodology/approach: An original assessment framework regarding municipal Electronic Services was created based on the literature review. The assessment framework was included in a methodological approach supported by the PROMETHEE II method, as well as by selected statistical methods. The framework and the methodological approach were applied in the case of Greek municipalities. Findings: The analysis revealed the low maturity level of Greek municipalities in Electronic Services sector. The Greek case study indicated that the proposed framework and methodological approach could provide useful insights to municipalities for the improvement of its E-Government Web services based on their strategic preferences. Research limitations/implications: The assessment took place only in Greece, assessing all the country's municipalities and conducting research only in the municipalities’ websites. The proposed methodology suggests that the PROMETHEE II multi-criteria decision analysis method can support the assessment of the maturity level of local government entities. Moreover, the combination of the PROMETHEE II–empowered assessment framework with demographic statistical analysis can assist orthological decision-making concerning future investments in Web Electronic Services. The methodology could be a good option for future research efforts (assessments) in municipalities, in Greece and worldwide. Practical implications: The framework is both easy to use and fairly complete. The fact that the assessment was conducted in all the Greek municipalities makes it much more reliable, as it provides the whole picture. The suggested methodology which includes the proposed framework could be used in the cases of municipalities in other countries to assist future actions concerning the investment in Web Electronic Services. Originality/value: This study provided a medium-size framework, being both complete and easy to use during the evaluation process of all the municipalities in Greece. In addition, the statistical analysis received data from a decision-making tool to execute the clustering (Cluster analysis is usually performed based on the raw data).

7 November 2022 in Sustainability
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EKEleni Krikigianni
Eleni Krikigianni
ELEvangelia Latsa
Evangelia Latsa
Sotiris GayialisSotiris Gayialis
Sotiris Gayialis
Nikolaos A. PanayiotouNikolaos A. Panayiotou
Nikolaos A. Panayiotou
MKMargarita Kostovasili
Margarita Kostovasili
Angelos AmditisAngelos Amditis
Angelos Amditis
The maritime supply chain is a colossal ecosystem and the interface of the intercontinental trade market. Within this ecosystem, freight transportation is considered a fundamental component of all supply chain systems. As a matter of its demanding multimodal and intermodal character, freight transportation is a highly competitive market where actors involved, demand reliable and high-quality services at competitive prices. However, even though its systems keep evolving, being spurred by developments at multiple levels, the maritime actors’ fundamental operational processes keep an unprecedented low pace of evolution and transformation, and the maritime supply chain market is considered to be as hyper-fragmented as ever. This paper investigates how the effective, efficient, and sustainable matching of the demand and supply needs of the actors involved in the maritime supply chain domain can be strategically achieved and supported through specialised information systems. The paper, also presents a holistic framework for designing these systems. The analysis was based on the outcomes received from a number of interviews conducted with strategically positioned experts, pointing out their emerging needs and the challenges they face. The outcomes showed that digital transformation is still in its infancy but that the embracement of a decision-matchmaking system could be a real game changer.