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Article Simultaneous Pickup and Delivery Model Suggestion for Personnel Transportation in Covid-19 Pandemic Conditions(Wroclaw Univ Science & Technology, Fac Management, 2023) Kose, Erkan; Vural, Danışment; Kokmazer, Ahsen; Vural, Danisment; Gokceoglu, Gokce Gul; Savli, Pinar; Vural, Danışment; Industrial Engineering; Industrial EngineeringThe impact of COVID-19 on the transportation costs of a large-scale company has been examined. Before the pandemic, shift personnel were transported to the factory by shuttles, and after a quick shift change, other shift personnel were transported back to their homes. However, with the implementation of laws mandating the reduction of shuttle seat capacities, transportation costs have risen significantly. To address this issue, a new simultaneous pickup and delivery model is proposed as an alternative to the separate transportation of shift workers. The results of this study indicate that the proposed model provides a substantial advantage in terms of both the number of vehicles used and the total distance traveled, leading to a significant reduction in costs. This research underscores the importance of effective operations research practices for the profitability of companies, particularly in extraordinary circumstances such as the COVID-19 pandemic.Article Citation - WoS: 4Citation - Scopus: 4Optimising Traffic Safety - Locating Traffic Gendarmes Based on Multi-Criteria Decision Making(Sveuciliste U Zagrebu, Fakultet Prometnih Znanosti, 2023) Abdulvahitoglu, Adnan; Vural, Danisment; Abdulvahitoglu, AsliTurkey's expanding population and growing economy have resulted in a significant increase in automobile ownership, leading to a rise in traffic volume and, subsequently, an increase in the number of accidents. The increase in the number of deaths and injuries caused by traffic accidents has motivated authorities and automobile manufacturers to work together to mitigate the impact of traffic accidents. Therefore, the demand for better roads, modern technologies and higher-quality driver training is becoming increasingly urgent for traffic safety. Due to the scale of harm to the country's economy and society caused by the material and moral losses, resulting from traffic accidents, traffic safety and management is one of the most important government initiatives. One of the responsible units of traffic safety and management in Turkey is the traffic gendarme. This study reviewed the categories of traffic accidents, the number of accidents, and the road network that occurred in a province's gendarme responsibility area in Turkey and linked them with the number of traffic gendarmes in that province. Thus, the study utilised mixed integer programming based on multi-criteria decision-making methods to identify the areas where these traffic gendarmes will be deployed according to established principles.
