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    Application of AHP and VIKOR methods under interval type 2 fuzzy environment in maritime transportation
    (Pergamon-Elsevier Science Ltd, 2017) Soner, Omer; Celik, Erkan; Akyüz, Emre
    The aim of this paper is to provide not only a hybrid theoretical methodology in multiple-attribute decision making problems but also a practical application in maritime transportation industry. The proposed hybrid approach integrates Analytic Hierarchy Process (AHP) method into VlseKriterijumska Optimizacijia I Kompromisno Resenje, (VIKOR) technique under interval type-2 fuzzy (IT2F) environment. While AHP and VIKOR provides a comprehensive framework to solve multiple-attribute decision making (MADM) problems in maritime transportation industry, the IT2F enables to deal with much uncertainty during linguistic assessment of decision-makers. The proposed approach is demonstrated with a hatch cover design selection problem since it has utmost importance in structure of bulk carrier ships to prevent water ingress and protect cargo form the external damages. Besides its robust theoretical insight, the paper has practical contribution to the naval engineers, classification societies and ship owners who have difficulty in deciding appropriate hatch cover type during construction of the ship.
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    A fuzzy DEMATEL method to evaluate critical operational hazards during gas freeing process in crude oil tankers
    (Elsevier Sci Ltd, 2015) Akyüz, Emre; Celik, Erkan
    Gas freeing process in crude oil tanker ships is widely recognized one of the most hazardous aspects of shipboard operations. Although the process provides practical benefits to ship by removing the explosive or poisonous gases from the cargo tanks and raising the oxygen level up to 21 percent, the consequences of failure may cause serious damage to human health, marine environment and cargo. Therefore, the crew exercise utmost care and become aware of the potential hazards in gas freeing process. In this context, this paper provides a fuzzy DEMATEL (Decision Making Trial and Evaluation Laboratory) method to evaluate critical operational hazards in gas freeing process. While the DEMATEL method enables to identify and analyse the potential hazards of gas freeing process with respect to causal effect relation diagram, fuzzy sets deal with the uncertainty in decision-making and human judgements through the DEMATEL. Thus, the hybrid approach provides smart solution for safety practitioners to prevent critical hazards in gas freeing process. The results of the research will contribute to maritime safety at sea and prevention of environment pollution as well as loss of life on-board crude oil tankers ships. (C) 2015 Elsevier Ltd. All rights reserved.
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    A hybrid risk-based approach for maritime applications: The case of ballast tank maintenance
    (Taylor & Francis Inc, 2017) Gul, Muhammet; Celik, Erkan; Akyüz, Emre
    Risk assessment is vital for cost-effective ship management in maritime industry since numerous maritime activities pose potential hazards according to the human causalities. Therefore, safety practitioners attempt to offer proactive approaches to mitigate risk as much as possible. In this context, this article presents a hybrid risk-based approach for maritime industry by adopting Fuzzy Analytic Hierarchy Process (FAHP) with fuzzy VIKOR (FVIKOR) methods under Fine-Kinney approach. To illustrate the hybrid risk-based approach, ballast tank maintenance process is handled since there are various hazards causing fatalities, severe injuries, and illness during ballast tank maintenance procedure than any other type of shipboard work. An extensive risk analysis is performed to enhance environment safety and operational reliability in maritime industry. Besides its theoretical contribution, the outcomes of the paper contribute to improve overall safety level of ship by considering potential hazards in risk management.
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    A modified human reliability analysis for cargo operation in single point mooring (SPM) off-shore units
    (Elsevier Sci Ltd, 2016) Akyüz, Emre; Celik, Erkan
    A Single Point Mooring (SPM) unit is a widely recognised off-shore terminal facility in the marine industry since a considerable amount of liquid cargoes can easily be transferred into huge tankers such as VLCCs or ULCCs. Although the system presents high safety standards, any minor accidents due to human error may cause serious harm to the marine environment, human life and the commodity itself. Therefore, nominated crew on-board the tanker and the unit should be very careful during SPM cargo operations. At this point, human reliability plays a critical role in avoiding potential operational or technical failures. In this context, the aim of this paper is to perform a comprehensive human reliability assessment during cargo operations of an SPM unit to enhance maritime safety in off-shore units. The paper prompts a methodological extension of human error assessment and reduction technique (HEART) by incorporating interval type-2 fuzzy sets which overcome more of the uncertainty of experts' judgement and expression in decision-making. The proposed approach not only provides theoretical insight but practical contribution to human reliability assessment in the marine and off-shore industries. (C) 2016 Elsevier Ltd. All rights reserved.
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    A practical application of human reliability assessment for operating procedures of the emergency fire pump at ship
    (Taylor & Francis Ltd, 2018) Akyüz, Emre; Celik, Erkan; Celik, Metin
    This paper aims to conduct a practical application for human reliability assessment during operating procedures of an emergency fire pump on-board ship. A systematic human error prediction is performed for designated tasks during operational procedures of the emergency fire pump since human error can be regarded as one of the major factors contributing accidents at sea. Hence, human reliability performance is evaluated to enhance fire safety management in operational level on-board ship. In the paper, marine-specific error producing conditions are adopted under fuzzy sets environment. To enhance consistency of research and minimise subjectivity during expert's judgement stage, the paper is supported with a dominance factor which is used to adjust the impact level of expert's judgments in the aggregation stage of the methodology. The outcomes of the paper provide valuable contributions to the safety managers and technical superintends to monitor fire safety management and crew reliability performance.
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    The role of human factor in maritime environment risk assessment: A practical application on Ballast Water Treatment (BWT) system in ship
    (Taylor & Francis Inc, 2018) Akyüz, Emre; Celik, Erkan
    The role of human factor plays a critical role in the safe and clean operation of maritime industry. Human error prediction can be beneficial to assess risk in maritime industry since shipping activities can pose potential hazards to human life and maritime ecology. The aim of this paper is to propose a risk assessment tool by considering the role of human factor. Hence, the desired safety control level in maritime transportation activities can be ascertained. In the proposed approach, a Success Likelihood Index Method (SLIM) extended with fuzzy logic is used to calculate human error probability (HEP). Severity of consequences are adopted in the proposed approach to assess risk. The quantitative risk assessment approach under fuzzy SLIM methodology will be applied to a very specific case on-board ship: Ballast Water Treatment (BWT) system. In order to improve consistency of research and minimize subjectivity of experts' judgments, the paper adopts the dominance factor which is used to adjust the impact level of experts' judgments in the aggregation stage of the methodology. The paper aims at not only highlighting the importance of human factor in maritime risk assessment but also enhancing safety control level and minimizing potential environmental impacts to marine ecology.