This book examines the interaction between the technical and economic issues in database-assisted dynamic spectrum networks. It explains various business models for different network settings, analyzing the user behaviors and system equilibrium under each model.With the explosive growth of mobile devices and bandwidth-hungry applications, radio spectrum is becoming increasingly congested and scarce. Database-assisted dynamic spectrum sharing is a promising technology for solving th...

This book provides a comprehensive coverage of reconfigurable intelligent surface (RIS) based wireless communications by covering all the technology stages from working principles, theories and algorithms, system architectures, real-world implementations, and programming platforms through performance measurements and system testing. Metasurfaces for Wireless Communications: Designs and Implementations serves as a must-be read for everything related to the use of RIS in wireless networks.

Latent factor analysis models are an effective type of machine learning model for addressing high-dimensional and sparse matrices, which are encountered in many big-data-related industrial applications. The performance of a latent factor analysis model relies heavily on appropriate hyper-parameters. However, most hyper-parameters are data-dependent, and using grid-search to tune these hyper-parameters is truly laborious and expensive in computational terms. Hence, how to achieve efficient ...

The pity of the heavens had allowed her to return to the age of sixteen. In her previous life, she had been a weak and lowly person that everyone could bully.In this world, no one dared to not fear her. The life that she owed her in was one in which she would pay back twice as much. Scoundrel would not show any mercy. The trap was still as secretive as ever: he thought he could see through everyone's hearts, but he had accidentally lost his heart in the transaction...

Heart of the pill melancholy sea of clouds, white rainbow of the day in the youth. This was the summary of the fifth hidden spirit's life. In order to prove his innocence, Luo Ying, who lost both of his parents in the "Jade Wall extermination", joined the Imperial Capital and became its fifth hidden spirit, absorbed all of the true essence of the Twilight Jade and was falsely accused of being the murderer in the destruction of the bamboo forest in the radius of a hundred li under the Shang...

The pity of the heavens had allowed her to return to the age of sixteen. In her previous life, she had been a weak and lowly person that everyone could bully.In this world, no one dared to not fear her. The life that she owed her in was one in which she would pay back twice as much. Scoundrel would not show any mercy. The trap was still as secretive as ever: he thought he could see through everyone's hearts, but he had accidentally lost his heart in the transaction...

Heart of the pill melancholy sea of clouds, white rainbow of the day in the youth. This was the summary of the fifth hidden spirit's life. In order to prove his innocence, Luo Ying, who lost both of his parents in the "Jade Wall extermination", joined the Imperial Capital and became its fifth hidden spirit, absorbed all of the true essence of the Twilight Jade and was falsely accused of being the murderer in the destruction of the bamboo forest in the radius of a hundred li under the Shang...

The pity of the heavens had allowed her to return to the age of sixteen. In her previous life, she had been a weak and lowly person that everyone could bully.In this world, no one dared to not fear her. The life that she owed her in was one in which she would pay back twice as much. Scoundrel would not show any mercy. The trap was still as secretive as ever: he thought he could see through everyone's hearts, but he had accidentally lost his heart in the transaction...

The pity of the heavens had allowed her to return to the age of sixteen. In her previous life, she had been a weak and lowly person that everyone could bully.In this world, no one dared to not fear her. The life that she owed her in was one in which she would pay back twice as much. Scoundrel would not show any mercy. The trap was still as secretive as ever: he thought he could see through everyone's hearts, but he had accidentally lost his heart in the transaction...

This book provides readers with the most advanced research on bridge engineering structures and high performance concrete applications in China.Bridges as an important part of transportation facilities, its structural design and safety has been more concerned about the content. Especially in modern times, because of the needs of human travel and urban development, the structure of the bridge has also seen many innovations. However, there are consequent concerns about structural saf...

Oxidative Stress and Age-Related Neurodegeneration brings together researchers from a variety of fields to compare normal aging and disease-related neurodegeneration in terms of susceptibility to and effects of oxidative stress. They address how these effects can be attenuated, and examine whether antioxidants and natural micronutrients, such as those found in Gingko biloba, green tea, blueberries, and grape seed extract, can play a role. The book includes various ways research is getting ...