Research on VANETs (vehicular ad hoc networks) date back to the beginning of the 2000s. The possibility of enabling communication between vehicles through a wireless network stimulated the creation of new protocols, devices, and diverse utilization scenarios. Due to the intrinsic difficulties of using a real testbed to evaluate these research contributions, several simulators were developed at the time. Recently, with the advent of autonomous vehicles and the emergence of novel technologies (e.g., 5G and edge computing), new research challenges on VANETs are coming into sight. Therefore, revisiting VANET simulators is required to identify if they are still capable of evaluating these new scenarios. This paper presents an updated review of VANET simulators, showing their current state and capabilities to assess novel scenarios in VANET research. Based on this analysis, we identify open research challenges that should be addressed in current and future VANET simulators.
A Internet das Coisas (IoT) e a popularização de dispositivos móveis traz novos desafios quanto a remoção de arquivos. Técnicas tradicionalmente empregadas em meios magnéticos não são efetivas para memórias não voláteis, como a memória flash. Consequentemente, novos métodos de remoção segura foram desenvolvidos, que empregam operações de Sobrescrita com Zeros e de Apagamento de Blocos. Este trabalho analisa estes métodos e propõe um novo, com melhor desempenho. O método proposto é um híbrido, combinando de forma equilibrada operações de sobrescrita e apagamento, para evitar o apagamento desnecessário de blocos ainda não utilizados e reduzir o desgaste prematuro da memória.
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