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https://www.readbyqxmd.com/read/29329248/performance-analysis-of-millimeter-wave-multi-hop-machine-to-machine-networks-based-on-hop-distance-statistics
#1
Haejoon Jung, In-Ho Lee
As an intrinsic part of the Internet of Things (IoT) ecosystem, machine-to-machine (M2M) communications are expected to provide ubiquitous connectivity between machines. Millimeter-wave (mmWave) communication is another promising technology for the future communication systems to alleviate the pressure of scarce spectrum resources. For this reason, in this paper, we consider multi-hop M2M communications, where a machine-type communication (MTC) device with the limited transmit power relays to help other devices using mmWave...
January 12, 2018: Sensors
https://www.readbyqxmd.com/read/29328623/mimicking-biological-synaptic-functionality-with-an-indium-phosphide-synaptic-device-on-silicon-for-scalable-neuromorphic-computing
#2
Debarghya Sarkar, Jun Tao, Wei Wang, Qingfeng Lin, Matthew Yeung, Chenhao Ren, Rehan Kapadia
Neuromorphic or "brain-like" computation is a leading candidate for efficient, fault-tolerant processing of large-scale data, as well as real-time sensing and transduction of complex multivariate systems and networks such as self-driving vehicles or Internet of Things applications. In biology, the synapse serves as an active memory unit in the neural system, and is the component responsible for learning and memory. Electronically emulating this element via a compact, scalable technology which can be integrated in a 3-D architecture is critical for future implementations of neuromorphic processors...
January 12, 2018: ACS Nano
https://www.readbyqxmd.com/read/29316643/solving-smart-city-transport-problems-by-designing-carpooling-gamification-schemes-with-multi-agent-systems-the-case-of-the-so-called-mordor-of-warsaw
#3
Robert Olszewski, Piotr Pałka, Agnieszka Turek
To reduce energy consumption and improve residents' quality of life, "smart cities" should use not only modern technologies, but also the social innovations of the "Internet of Things" (IoT) era. This article attempts to solve transport problems in a smart city's office district by utilizing gamification that incentivizes the carpooling system. The goal of the devised system is to significantly reduce the number of cars, and, consequently, to alleviate traffic jams, as well as to curb pollution and energy consumption...
January 6, 2018: Sensors
https://www.readbyqxmd.com/read/29315850/inductor-free-wireless-energy-delivery-via-maxwell-s-displacement-current-from-an-electrodeless-triboelectric-nanogenerator
#4
Xia Cao, Meng Zhang, Jinrong Huang, Tao Jiang, Jingdian Zou, Ning Wang, Zhong Lin Wang
Wireless power delivery has been a dream technology for applications in medical science, security, radio frequency identification (RFID), and the internet of things, and is usually based on induction coils and/or antenna. Here, a new approach is demonstrated for wireless power delivery by using the Maxwell's displacement current generated by an electrodeless triboelectric nanogenerator (TENG) that directly harvests ambient mechanical energy. A rotary electrodeless TENG is fabricated using the contact and sliding mode with a segmented structure...
January 5, 2018: Advanced Materials
https://www.readbyqxmd.com/read/29315250/blockchain-based-decentralized-management-of-demand-response-programs-in-smart-energy-grids
#5
Claudia Pop, Tudor Cioara, Marcel Antal, Ionut Anghel, Ioan Salomie, Massimo Bertoncini
In this paper, we investigate the use of decentralized blockchain mechanisms for delivering transparent, secure, reliable, and timely energy flexibility, under the form of adaptation of energy demand profiles of Distributed Energy Prosumers, to all the stakeholders involved in the flexibility markets (Distribution System Operators primarily, retailers, aggregators, etc.). In our approach, a blockchain based distributed ledger stores in a tamper proof manner the energy prosumption information collected from Internet of Things smart metering devices, while self-enforcing smart contracts programmatically define the expected energy flexibility at the level of each prosumer, the associated rewards or penalties, and the rules for balancing the energy demand with the energy production at grid level...
January 9, 2018: Sensors
https://www.readbyqxmd.com/read/29311598/graphene-oxide-dielectric-permittivity-at-ghz-and-its-applications-for-wireless-humidity-sensing
#6
Xianjun Huang, Ting Leng, Thanasis Georgiou, Jijo Abraham, Rahul Raveendran Nair, Kostya S Novoselov, Zhirun Hu
In this work, the relative dielectric permittivity of graphene oxide (GO), both its real and imaginary parts, have been measured under various humidity conditions at GHz. It is demonstrated that the relative dielectric permittivity increases with increasing humidity due to water uptake. This finding is very different to that at a couple of MHz or lower frequency, where the relative dielectric permittivity increases with decreasing humidity. This GO electrical property was used to create a battery-free wireless radio-frequency identification (RFID) humidity sensor by coating printed graphene antenna with the GO layer...
January 8, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29301351/hare-supporting-efficient-uplink-multi-hop-communications-in-self-organizing-lpwans
#7
Toni Adame Vázquez, Sergio Barrachina-Muñoz, Boris Bellalta, Albert Bel
The emergence of low-power wide area networks (LPWANs) as a new agent in the Internet of Things (IoT) will result in the incorporation into the digital world of low-automated processes from a wide variety of sectors. The single-hop conception of typical LPWAN deployments, though simple and robust, overlooks the self-organization capabilities of network devices, suffers from lack of scalability in crowded scenarios, and pays little attention to energy consumption. Aimed to take the most out of devices' capabilities, the HARE protocol stack is proposed in this paper as a new LPWAN technology flexible enough to adopt uplink multi-hop communications when proving energetically more efficient...
January 3, 2018: Sensors
https://www.readbyqxmd.com/read/29300449/alkoxybenzothiadiazole-based-fullerene-and-nonfullerene-polymer-solar-cells-with-high-shunt-resistance-for-indoor-photovoltaic-applications
#8
Song Yi Park, Yuxiang Li, Jaewon Kim, Tack Ho Lee, Bright Walker, Han Young Woo, Jin Young Kim
We synthesized three semi-crystalline polymers (PTTBTBO, PDTBTBO, and P2FDTBTBO) by modulating the intra- and intermolecular noncovalent coulombic interactions, and investigated their photovoltaic characteristics under various light intensities. Low series (Rs) and high shunt (Rsh) resistances are essential prerequisites for good device properties under standard illumination (100 mW cm-2). Considering these factors, among three polymers PDTBTBO polymer solar cells (PSCs) exhibited the most desirable characteristics, with peak power conversion efficiencies (PCE) of 7...
January 4, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29286339/simplified-antenna-group-determination-of-rs-overhead-reduced-massive-mimo-for-wireless-sensor-networks
#9
Byung Moo Lee
Massive multiple-input multiple-output (MIMO) systems can be applied to support numerous internet of things (IoT) devices using its excessive amount of transmitter (TX) antennas. However, one of the big obstacles for the realization of the massive MIMO system is the overhead of reference signal (RS), because the number of RS is proportional to the number of TX antennas and/or related user equipments (UEs). It has been already reported that antenna group-based RS overhead reduction can be very effective to the efficient operation of massive MIMO, but the method of deciding the number of antennas needed in each group is at question...
December 29, 2017: Sensors
https://www.readbyqxmd.com/read/29280975/design-and-practical-evaluation-of-a-family-of-lightweight-protocols-for-heterogeneous-sensing-through-ble-beacons-in-iot-telemetry-applications
#10
Dixys L Hernández-Rojas, Tiago M Fernández-Caramés, Paula Fraga-Lamas, Carlos J Escudero
The Internet of Things (IoT) involves a wide variety of heterogeneous technologies and resource-constrained devices that interact with each other. Due to such constraints, IoT devices usually require lightweight protocols that optimize the use of resources and energy consumption. Among the different commercial IoT devices, Bluetooth and Bluetooth Low Energy (BLE)-based beacons, which broadcast periodically certain data packets to notify their presence, have experienced a remarkable growth, specially due to their application in indoor positioning systems...
December 27, 2017: Sensors
https://www.readbyqxmd.com/read/29276327/critical-agentic-and-trans-media-frameworks-and-findings-from-a-foresight-analysis-exercise-on-audiences
#11
Ranjana Das, Brita Ytre-Arne
We write this article presenting frameworks and findings from an international network on audience research, as we stand 75 years from Herta Herzog's classic investigation of radio listeners, published in Lazarsfeld and Stanton's 1944 war edition of Radio Research. The article aims to contribute to and advance a rich strand of self-reflexive stock-taking and sorting of future research priorities within the transforming field of audience analysis, by drawing on the collective efforts of CEDAR - Consortium on Emerging Directions in Audience Research - a 14-country network (2015-2018) funded by the Arts and Humanities Research Council, United Kingdom, which conducted a foresight analysis exercise on developing current trends and future scenarios for audiences and audience research in the year 2030...
December 2017: European Journal of Communication
https://www.readbyqxmd.com/read/29261113/enhancing-time-synchronization-support-in-wireless-sensor-networks
#12
Leandro Tavares Bruscato, Tales Heimfarth, Edison Pignaton de Freitas
With the emerging Internet of Things (IoT) technology becoming reality, a number of applications are being proposed. Several of these applications are highly dependent on wireless sensor networks (WSN) to acquire data from the surrounding environment. In order to be really useful for most of applications, the acquired data must be coherent in terms of the time in which they are acquired, which implies that the entire sensor network presents a certain level of time synchronization. Moreover, to efficiently exchange and forward data, many communication protocols used in WSN rely also on time synchronization among the sensor nodes...
December 20, 2017: Sensors
https://www.readbyqxmd.com/read/29244776/internet-of-things-iot-based-design-of-a-secure-and-lightweight-body-area-network-ban-healthcare-system
#13
Yong-Yuan Deng, Chin-Ling Chen, Woei-Jiunn Tsaur, Yung-Wen Tang, Jung-Hsuan Chen
As sensor networks and cloud computation technologies have rapidly developed over recent years, many services and applications integrating these technologies into daily life have come together as an Internet of Things (IoT). At the same time, aging populations have increased the need for expanded and more efficient elderly care services. Fortunately, elderly people can now wear sensing devices which relay data to a personal wireless device, forming a body area network (BAN). These personal wireless devices collect and integrate patients' personal physiological data, and then transmit the data to the backend of the network for related diagnostics...
December 15, 2017: Sensors
https://www.readbyqxmd.com/read/29242117/design-implementation-and-evaluation-of-an-internet-of-things-iot-network-system-for-restaurant-food-waste-management
#14
Zongguo Wen, Shuhan Hu, Djavan De Clercq, M Bruce Beck, Hua Zhang, Huanan Zhang, Fan Fei, Jianguo Liu
Catering companies around the world generate tremendous amounts of waste; those in China are no exception. The paper discusses the design, implementation, and evaluation of a sensor-based Internet of Things (IoT) network technology for improving the management of restaurant food waste (RFW) in the city of Suzhou, China. This IoT-based system encompasses the generation, collection, transportation and final disposal of RFW. The Suzhou case study comprised four steps: (1) examination of the required functionality of an IoT-enabled system in the specific context of Suzhou; (2) configuration of the system architecture, both software and hardware components, according to the identified functionality; (3) installation of the components of the IoT system at the facilities of the stakeholders across the RFW generation-collection-transportation-disposal value chain; and (4) evaluation of the performance of the entire system, based on data from three years of operation...
December 11, 2017: Waste Management
https://www.readbyqxmd.com/read/29222422/reconfigurable-yagi-uda-antenna-based-on-a-silicon-reflector-with-a-solid-state-plasma
#15
Da-Jin Kim, Jang-Soon Park, Cheol Ho Kim, Jae Hur, Choong-Ki Kim, Young-Kyun Cho, Jun-Bong Ko, Bonghyuk Park, Dongho Kim, Yang-Kyu Choi
This paper describes the fabrication and characterization of a reconfigurable Yagi-Uda antenna based on a silicon reflector with a solid-state plasma. The silicon reflector, composed of serially connected p-i-n diodes, forms a highly dense solid-state plasma by injecting electrons and holes into the intrinsic region. When this plasma silicon reflector is turned on, the front-realized gain of the antenna increases by more than 2 dBi beyond 5.3 GHz. To achieve the large gain increment, the structure of the antenna is carefully designed with the aid of semiconductor device simulation and antenna simulation...
December 8, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29215064/self-adaptive-bioinspired-hummingbird-wing-stimulated-triboelectric-nanogenerators
#16
Abdelsalam Ahmed, Islam Hassan, Peiyi Song, Mohamed Gamaleldin, Ali Radhi, Nishtha Panwar, Swee Chuan Tjin, Ahmed Y Desoky, David Sinton, Ken-Tye Yong, Jean Zu
Bio-inspired technologies have remarkable potential for energy harvesting from clean and sustainable energy sources. Inspired by the hummingbird-wing structure, we propose a shape-adaptive, lightweight triboelectric nanogenerator (TENG) designed to exploit the unique flutter mechanics of the hummingbird for small-scale wind energy harvesting. The flutter is confined between two surfaces for contact electrification upon oscillation. We investigate the flutter mechanics on multiple contact surfaces with several free-standing and lightweight electrification designs...
December 7, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29210411/graphene-integrated-circuits-new-prospects-towards-receiver-realisation
#17
Mohamed Saeed, Ahmed Hamed, Zhenxing Wang, Mehrdad Shaygan, Daniel Neumaier, Renato Negra
This work demonstrates a design approach which enables the fabrication of fully integrated radio frequency (RF) and millimetre-wave frequency direct-conversion graphene receivers by adapting the frontend architecture to exploit the state-of-the-art performance of the recently reported wafer-scale CVD metal-insulator-graphene (MIG) diodes. As a proof-of-concept, we built a fully integrated microwave receiver in the frequency range 2.1-2.7 GHz employing the strong nonlinearity and the high responsivity of MIG diodes to successfully receive and demodulate complex, digitally modulated communication signals at 2...
December 21, 2017: Nanoscale
https://www.readbyqxmd.com/read/29206215/dynamic-spectrum-access-for-internet-of-things-service-in-cognitive-radio-enabled-lpwans
#18
Bongkyo Moon
In this paper, we focus on a dynamic spectrum access strategy for Internet of Things (IoT) applications in two types of radio systems: cellular networks and cognitive radio-enabled low power wide area networks (CR-LPWANs). The spectrum channel contention between the licensed cellular networks and the unlicensed CR-LPWANs, which work with them, only takes place within the cellular radio spectrum range. Our aim is to maximize the spectrum capacity for the unlicensed users while ensuring that it never interferes with the licensed network...
December 5, 2017: Sensors
https://www.readbyqxmd.com/read/29206159/energy-management-in-smart-cities-based-on-internet-of-things-peak-demand-reduction-and-energy-savings
#19
Chinmaya Mahapatra, Akshaya Kumar Moharana, Victor C M Leung
Around the globe, innovation with integrating information and communication technologies (ICT) with physical infrastructure is a top priority for governments in pursuing smart, green living to improve energy efficiency, protect the environment, improve the quality of life, and bolster economy competitiveness. Cities today faces multifarious challenges, among which energy efficiency of homes and residential dwellings is a key requirement. Achieving it successfully with the help of intelligent sensors and contextual systems would help build smart cities of the future...
December 5, 2017: Sensors
https://www.readbyqxmd.com/read/29199461/biomarkers-delivering-on-the-expectation-of-molecularly-driven-quantitative-health
#20
Jennifer L Wilson, Russ B Altman
Biomarkers are the pillars of precision medicine and are delivering on expectations of molecular, quantitative health. These features have made clinical decisions more precise and personalized, but require a high bar for validation. Biomarkers have improved health outcomes in a few areas such as cancer, pharmacogenetics, and safety. Burgeoning big data research infrastructure, the internet of things, and increased patient participation will accelerate discovery in the many areas that have not yet realized the full potential of biomarkers for precision health...
January 1, 2017: Experimental Biology and Medicine
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