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In recent years, the unmanned aerial vehicles (UAVs) have exhibited significant market potential to greatly reduce the cost and time in the field of logistics. The use of UAVs to provide commercial courier has become an emerging industry, remarkably shifting the energy use of the freight sector. However, due to limited battery capacities, the flight duration of civilian rotorcraft UAVs is still short, hindering them from performing remote jobs. In this case, people customarily utilize ground vehicles to carry and assist UAVs in various applications, including cargo delivery. Most previous studies on vehicle-drone cooperative parcel delivery considered only one UAV, thereby suffering from low efficiency when serving a large number of customers. In this paper, we propose a novel hybrid genetic algorithm, which supports the cooperation of a ground vehicle and multiple UAVs for efficient parcel delivery. Our routing and scheduling algorithm allows multiple UAVs carried by the vehicle to simultaneously deliver multiple parcels to customers residing in different locations. The proposed algorithm consists of a pipeline of several modules: population management, heuristic population initialization, and population education. The performance evaluation results show that the proposed algorithm has significant efficiency over existing algorithms.INDEX TERMS Unmanned aerial vehicle, cargo delivery, routing, scheduling.

The Scythians were an early nomadic people on the Eurasian steppe. In wars and trade with the Central Asian empires, Greece, Eastern Europe and even China, they exchanged cultures and ways of life. This paper will focus on the Scythian migration process and cultural integration in the habitat from the 7th to the 4th century BC. In addition, this article will focus on the trade and communication between the Scythian and the East and Greece. This paper will analyze the trade and cultural exchanges in Eurasia during the Bronze Age, as well as some prerequisite factors for the formation of the Silk Road.

Alexander the Great is one of the most legendary figures in ancient Greek and Roman history. It's amazing how he was born, how he grew up, how talented he was, and what he achieved. Alexander the Great came from mythology, and he lived with Greek mythology all his life. He learned from the myth what it takes to be a leader, a warrior. Family disputes ran through almost the entire first half of his life, and he was on his way to becoming a great emperor. It was his talent that allowed him to lead his troops to victory in a war where he was outnumbered and built a vast empire. Throughout his life, myths, family disputes and personal talent were all part of his success.