Performance Evaluation of Multi-UAV System in Post-Disaster Application….

Can eyes in the air counter chaos on the ground? Researchers in Japan analyzed performance of unmanned aerial vehicles (UAVs) used in the response to the 2011 Tohoku earthquake-tsunami disaster, and report on their findings in this IEEE Access article of the week.

The paper proposes an evaluation of unmanned aerial vehicles (UAVs) performance in the mapping of disaster-struck areas. Sendai city in Japan, which was struck by the Tohoku earthquake/tsunami disaster in 2011, was mapped using multi-heterogeneous UAV.

Normal mapping and searching missions are challenging as human resources are limited, and rescue teams are always needed to participate in disaster response mission. Mapping data and UAV performance evaluation will help rescuers to access and commence rescue operations in disaster-affected areas more effectively.

Herein, flight-plan designs are based on the information recorded after the disaster and on the mapping capabilities of the UAVs. The numerical and statistical results of the mapping missions were validated by executing the missions on real-time flight experiments in a simulator and analyzing the flight logs of the UAVs.

After considering many factors and elements that affect the outcomes of the mapping mission, the authors provide a significant amount of useful data relevant to real UAV modules in the market. All flight plans were verified both manually and in a hardware-in-the-loop simulator developed by the authors. Most of the existing simulators support only a single UAV feature and have limited functionalities such as the ability to run different models on multiple UAVs.

The simulator demonstrated the mapping and fine-tuned flight plans on an imported map of the disaster. As revealed in the experiments, the presented results and performance evaluations can effectively distribute different UAV models in post-disaster mapping missions.

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Water-Resistant Smartphone Technologies


Smartphone manufacturers have begun to market their products as water-resistant to gain market share. However, many consumers report that these smartphones are not actually waterproof as many of the advertisements suggest, and water damage is not included in the warranty policy. To understand how companies are attempting to protect their smartphones against water damage, this paper evaluates three popular smartphones (iPhone 7 Plus, Samsung S7 Edge, and Huawei P9 Lite). The phones were disassembled to assess the use of gaskets, glues, and other adhesives and emerging high-end technologies including water-resistant coatings and breathable fabric membranes. In addition, failure causes of water-resistant smartphones are discussed in terms of limitations of the ingress protection tests within the International Electrotechnical Commission 60529 standard. Warranty issues are then presented and recommendations are given.

View this article on IEEE Xplore