Over the past few years, drones also known as unmanned aerial vehicles (UAV), have been adopted as a part of transportation activities in logistic sector. This paper investigates a new version of traveling salesman problem called as flying sidekick traveling salesman problem(FSTSP) in which trucks and drones serve the customers in coordination with the objective of minimizing the total delivery distance of trucks at the depot after completing the deliveries. Clarke & Wright's savings algorithm is a well-known heuristics approach in literature, which gives better solution for classical vehicle routing problem. In this paper, a hybrid approach based on Clarke & Wright's savings algorithm and genetic algorithm is proposed for solving the new version of travelling salesman problem. In the proposed hybrid algorithm, which is the sequential use of genetic algorithm and Clarke & Wright's savings algorithm, is used for assignment of the truck, drone or both of them to serve the customer. The solution of the genetic algorithm, which is the well-known metaheuristic approach, is enhanced with Clarke & Wright's savings algorithm. The aim of the problem is to minimize the total delivery distance according to the assignment decisions. This is the first hybrid approach in the literature including Clarke & Wright's savings algorithm and genetic algorithm that applies for FSTSP problem. The hypothetical experiments conducted on various instances and results confirm the efficiency of the approach and give some insights on this drone delivery system.
Beckwith-Wiedemann Sendromu (BWS) birçok organ anomalilerinin birlikte olduğu nadir görülen konjenital aşırı büyüme sendromlarından biridir. Bu yazımızda, prenatal ultrasonografi görüntülemesinde omfalosel saptanan ve doğum sonrasında yapılan fizik muayenedeki bulgular ile Becwith-Wiedemann sendromu (BWS) tanısı konulan üç aylık erkek olgu sunulmaktadır. BWS tanısı alan olgular; solunum ve beslenme sıkıntısı, yenidoğan hipoglisemisi, malignite gelişimi açısından dikkatle takip edilmelidir ve ailelere genetik danışmanlık verilmelidir.
Karın ağrısı şikayeti çocukluk çağında poliklinik ve acil servis başvurularının en sık nedenlerinden biri olup pankreasla ilgili patolojiler nadir olarak görülmektedir. Pankreas hasarı, diyabet, apseleşme, psödokist, sepsis ve nekroz gibi çok önemli komplikasyonları olması nedeniyle akut pankreatitin karın ağrısı ile başvuran hastalarda ayırıcı tanıda yer alması çok önemlidir. Bu olguda karın ağrısı şikayeti ile acil servise başvuran ve akut pankreatit tanısı alan hasta sunulmuştur.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
customersupport@researchsolutions.com
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.