Research on a Watermarking Algorithm for Remote Sensing Images Resist Screen Capture Attacks in Urban Planning Information Management

Remote Sensing data, as an essential urban basic information in urban planning, has the characteristics of large information capacity, real time, high update speed and accuracy. Because of urban spatial information involving multi-faceted public and public interests, its data security is very important. The use of digital watermarking technology can effectively protect the secu-rity of urban planning basic data. In practical applications, the “screen capture” poses a great threat to the security of remote sensing image. In order to resist the screen capture attacks, the QR code watermark information is encoded and converted, and combined with a circular angle template watermark, a digital watermarking algorithm for remote sensing images in urban planning information management is proposed. And the proposed algorithm is experimentally verified. Experiments show that the algorithm is robust against screen capture attacks, and provide security guarantee for urban construction and management.

Ultra-robust stretchable electrode for e-skin:In situ assembly using a nanofiber scaffold and liquid metal to mimic water-to-net interaction

The development of stretchable electronics could enhance novel interface structures to solve the stretchability-conductivity dilemma,which remains a major challenge.Herein,we report a nano-liquid metal(LM)-based highly robust stretchable electrode(NHSE)with a self-adaptable interface that mimics water-tonet interaction.Based on the in situ assembly of electrospun elastic nanofiber scaffolds and electrosprayed LM nanoparticles,the NHSE exhibits an extremely low sheet resistance of 52 mΩsq^(-1).It is not only insensitive to a large degree of mechanical stretching(i.e.,350%electrical resistance change upon 570%elongation)but also immune to cyclic deformation(i.e.,5%electrical resistance increases after 330000 stretching cycles with 100%elongation).These key properties are far superior to those of the state-of-the-art reports.Its robustness and stability are verified under diverse circumstances,including long-term exposure to air(420 days),cyclic submersion(30000 times),and resilience against mechanical damages.The combination of conductivity,stretchability,and durability makes the NHSE a promising conductor/electrode solution for flexible/stretchable electronics for applications such as wearable on-body physiological signal detection,human-machine interaction,and heating e-skin.

High sensitivity and broad linearity range pressure sensor based on hierarchical in-situ filling porous structure

Flexible piezoresistive pressure sensor with high sensitivity over a broad linearity range have been attracting tremendous attention for its applications in health monitoring,artificial intelligence,and human-machine interfaces.Herein,we report a hierarchical insitu filling porous piezoresistive sensor(HPPS)by direct ink writing(DIW)printing and curing of carbon nanofibers(CNFs)/polydimethylsiloxane(PDMS)emulsion.Hierarchical geometry significantly increases the contact area,distributes stress to multilayered lattice and internal porous structure,resulting in a broad sensing range.Moreover,unlike conventional hollow porous structure,the CNFs networks in-situ filling porous structure generates more contact sites and conductive pathways during compression,thereby achieving high sensitivity and linearity over entire sensing range.Therefore,the optimized HPPS achieves high sensitivity(4.7 kPa^(−1))and linearity(coefficient of determination,R^(2)=0.998)over a broad range(0.03-1000 kPa),together with remarkable response time and repeatability.Furthermore,the applications in diverse pressure scenarios and healthcare monitoring are demonstrated.