The degree of reception of BS signals is affected by various factors. After routinely recording it at two observation points at two locations, we found that momentary upward and downward level shifts occurred multiple times, mainly during daytime. These level shifts were observed at one location. No such signal was sensed at the other location. After producing an algorithm to extract such momemtary level shifts, their statistical properties were investigated.Careful analyses, including assessment of the signal polarity, amplitude, duration, hours, and comparison with actual flight schedules and route information implied that these level shifts are attributable to the interference of direct and reflected waves from aircraft flying at approximately tropopause altitude. This assumption is further validated through computer simulations of BS signal interference.
Time has changed from the era when copyright protection of commercial music and movie contents was a major topic. Advanced multimedia devices, such as small camera and microphone of high quality, have become available at a price affordable to many people. Smartphones equipped with such devices have enough power to process the captured contents freely by users. As a result, our daily lives are filled with multimedia contents which are ceaselessly generated by anonymous people and consumed in a moment through social network services. In some applications, tremendous pieces of multimedia contents are generated by IoT sensors for decision making by AI to make our activities convenient. They may be also utilized for the training of AI. Reflecting such an environment, new services rapidly emerge one after another, and some of them lead to new problems relating privacy and safety. Therefore, it is important to keep updating technologies for multimedia safety which meet the demand at present. The invited paper of this special section is related to the safety of cloud service for images. Other papers are also relevant to AI technologies and their early stage to some extent.
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