<!CDATAFinding Augusta breaks new ground, revising how media studies interpret the relationship between our bodies and technology. This is a challenging exploration of how, for both good and ill, the ...sudden ubiquity of mobile devices, GPS systems, haptic technologies, and other forms of media alter individuals' experience of their bodies and shape the social collective. The author succeeds in problematizing the most salient fact of contemporary mobile media technologies, namely, that they have become, like highways and plumbing, an infrastructure that regulates habit.
Audacious in its originality, Finding Augusta will be of great interest to art and media scholars alike.>
Beam‐steering devices, which are at the heart of optical wireless‐broadcasting communication links, play an important role in data allocation and exchange. An ideal beam‐steering device features ...large steering angles, arbitrary channel numbers, reconfigurability, and ultracompactness. However, these criteria have been achieved only partially with conventional beam‐steering devices based on waveguides, micro‐electricalmechanical systems, spatial light modulators, and gratings, which will substantially limit the application of optical wireless‐broadcasting communication techniques. In this study, an ultracompact full‐duplex metabroadcasting communication system is designed and experimentally demonstrated, which exhibits beam steering angles up to ±40°, 14 broadcasting channels with capacity for downstream and upstream links up to 100 and 10 Gbps for each user channel, three operating modes for flexible signal switching, and metadevice dimensions as small as 2 mm × 2 mm. In particular, the beam‐steering metadevices are mass‐manufactured by a complementary metal–oxide–semiconductor (CMOS) processing platform, which shows their potential for large‐scale commercial applications. The demonstrated metabroadcasting communication system merges optical wireless‐broadcasting communications and metasurfaces, which reduces the complexity of beam‐steering devices while significantly increasing their performance, opening up a new avenue for high‐quality optical wireless‐broadcasting communications.
Assisted by an silicon‐on‐isolator‐based metasurface that can be mass‐manufactured by the complementary metal–oxide–semiconductor (CMOS) process, an ultracompact prototype for full‐duplex metabroadcasting communications is demonstrated, which shows beam‐steering angles up to ±40°, 14 broadcasting channels with capacity for downstream and upstream links up to 100 and 10 Gbps for each user channel, and three operating modes for flexible signal switching.
6G Wireless Communications and Mobile Networking introduces the key technologies behind 6G wireless communication and mobile networking to the reader. The book starts with a general vision of 6G ...technology, which includes the motivation that drives 6G research, the international organizations working on 6G standardization and recent progress in 6G research. Separate chapters on millimeter-wave and terahertz-wave technologies in 6G, the development of latest 6G antenna technology as well as related wireless communication applications are included in the contents. The book also provides details about the 6G network layer, such as self-organizing network driven by network slicing, software-defined networking and network function virtualization. Finally, it covers some popular research topics, including the challenges and solutions to massive 6G IoT networks, 6G cloud/edge computing and big data systems that may appear in the foreseeable future.Key Features:- Provides a complete introduction to 6G vision and technology- Consists of both basic theories and frontier technologies- Separate chapters on key topics such as 6G physical layers, millimeter wave and terahertz technology and advanced antenna arrays- Covers future trends and applications such as intelligent management systems, 6G IoT networks, cloud/edge computing and big data applicationsThis focused reference will significantly enhance the knowledge of engineering students and apprentices involved in the field of telecommunications. Readers interested in cutting edge wireless networking technologies will also benefit from the information provided.
Frequencies from 100 GHz to 3 THz are promising bands for the next generation of wireless communication systems because of the wide swaths of unused and unexplored spectrum. These frequencies also ...offer the potential for revolutionary applications that will be made possible by new thinking, and advances in devices, circuits, software, signal processing, and systems. This paper describes many of the technical challenges and opportunities for wireless communication and sensing applications above 100 GHz, and presents a number of promising discoveries, novel approaches, and recent results that will aid in the development and implementation of the sixth generation (6G) of wireless networks, and beyond. This paper shows recent regulatory and standard body rulings that are anticipating wireless products and services above 100 GHz and illustrates the viability of wireless cognition, hyper-accurate position location, sensing, and imaging. This paper also presents approaches and results that show how long distance mobile communications will be supported to above 800 GHz since the antenna gains are able to overcome air-induced attenuation, and present methods that reduce the computational complexity and simplify the signal processing used in adaptive antenna arrays, by exploiting the Special Theory of Relativity to create a cone of silence in over-sampled antenna arrays that improve performance for digital phased array antennas. Also, new results that give insights into power efficient beam steering algorithms, and new propagation and partition loss models above 100 GHz are given, and promising imaging, array processing, and position location results are presented. The implementation of spatial consistency at THz frequencies, an important component of channel modeling that considers minute changes and correlations over space, is also discussed. This paper offers the first in-depth look at the vast applications of THz wireless products and applications and provides approaches for how to reduce power and increase performance across several problem domains, giving early evidence that THz techniques are compelling and available for future wireless communications.
Reconfigurable intelligent surface (RIS) is a promising technology in realizing a smart wireless communication system. RIS is a man-made surface consisting of massive passive reflecting elements, ...where each element can reflect the incident signal with tunable phase shifts. To protect wireless communication from security breaches, physical layer security (PLS), which exploits the characteristics of wireless channels, has been widely studied to ensure secure transmission. Due to the reconfigurability of RIS, it has great potential to enhance PLS in wireless systems by enhancing the channel condition of a legitimate user (LU) and impairing that of an eavesdropper (EAV). However, low hardware cost and reconfigurability lead to non-negligible risk as the EAV and attacker can also apply RIS to promote the data rate at EAV or strengthen the interference signal transmitted to jam a LU. In this article, we introduce a new concept, illegal reconfigurable intelligent surface (IRIS), which represents the illegal deployment and utilization of RIS. Two main security concerns in the presence of IRIS, namely, signal leakage and interference attack, are inves-tigated. The signal leakage means that IRIS can collect the information signal, which could not be received before. The interference attack means the information signal can deploy IRIS to enhance the interference signal power. We discuss several key challenges brought by IRIS, and an artificial noise (AN)-aided joint optimization-based solution to enhance PLS in the wireless communication system with both RIS and IRIS. Simulation results demonstrate the significant impact of IRIS on PLS and verify the effectiveness of the proposed AN-aided joint optimization-based solution.
Chlorophyll a concentration (Chl) is a key variable for estimating primary production (PP) through ocean-color remote sensing (OCRS). Accurate Chl estimates are crucial for better understanding of ...the spatio-temporal trends in PP in recent decades as a consequence of climate change. However, a number of studies have reported that currently operational chlorophyll a algorithms perform poorly in the Arctic Ocean (AO), largely due to the interference of colored and detrital material (CDM) with the phytoplankton signal in the visible part of the spectrum. To determine how and to what extent CDM biases the estimation of Chl, we evaluated the performances of eight currently available ocean-color algorithms: OC4v6, OC3Mv6, OC3V, OC4L, OC4P, AO.emp, GSM01 and AO.GSM. Our results suggest that the empirical AO.emp algorithm performs the best overall, but, for waters with high CDM acdm(443) > 0.067 msup.−1), a common scenario in the Arctic, the two semi-analytical GSM models yield better performance. In addition, sensitivity analyses using a spectrally and vertically resolved Arctic primary-production model show that errors in Chl mostly propagate proportionally to PP estimates, with amplification of up to 7%. We also demonstrate that, the higher level of CDM in relation to Chl in the water column, the larger the bias in both Chl and PP estimates. Lastly, although the AO.GSM is the best overall performer among the algorithms tested, it tends to fail for a significant number of pixels (16.2% according to the present study), particularly for waters with high CDM. Our results therefore suggest the ongoing need to develop an algorithm that provides reasonable Chl estimates for a wide range of optically complex Arctic waters.
The merging of humans and machines depends on the contact sensor medium used. However, this contact interaction inevitably leads to mechanical loss. Photodetectors are cutting‐edge tools in optical ...communication that use controlled lighting to achieve efficient signal conversion to drive mechano–optical communication systems and provide an innovative interface for the Internet of Things services. Here, a self‐powered, non‐contact mechano–optical communication system based on a wearable Te@TeSe photodetector textile is presented, which encodes near‐infrared light to modulate robotic manipulator actions. The wearable Te@TeSe photodetector textile enhanced the photocurrent and responsivity by 400 times compared to a pristine Te nanowire (NW) array. The type II heterojunction of Te@TeSe NWs is proved by first‐principles calculations and simulated, providing insights on photogenic carrier transmission in Te@TeSe NWs. This system shows the possibility of duplicate real‐time execution of mechanical gestures in virtual environments and paves the way for advanced optical devices applied to information transmission and mechano–optical communication.
A self‐powered, non‐contact mechano–optical communication system based on a wearable Te@TeSe photodetector textile is presented, which encodes near‐infrared light to modulate robotic manipulator actions. This system shows the possibility of duplicate real‐time execution of mechanical gestures in virtual environments and paves the way for advanced optical devices applied to information transmission and mechano–optical communication.
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