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https://www.readbyqxmd.com/read/27918438/minimum-interference-channel-assignment-algorithm-for-multicast-in-a-wireless-mesh-network
#1
Sangil Choi, Jong Hyuk Park
Wireless mesh networks (WMNs) have been considered as one of the key technologies for the configuration of wireless machines since they emerged. In a WMN, wireless routers provide multi-hop wireless connectivity between hosts in the network and also allow them to access the Internet via gateway devices. Wireless routers are typically equipped with multiple radios operating on different channels to increase network throughput. Multicast is a form of communication that delivers data from a source to a set of destinations simultaneously...
December 2, 2016: Sensors
https://www.readbyqxmd.com/read/27910512/high-efficiency-integrated-readout-circuit-for-single-photon-avalanche-diode-arrays-in-fluorescence-lifetime-imaging
#2
G Acconcia, A Cominelli, I Rech, M Ghioni
In recent years, lifetime measurements by means of the Time Correlated Single Photon Counting (TCSPC) technique have led to a significant breakthrough in medical and biological fields. Unfortunately, the many advantages of TCSPC-based approaches come along with the major drawback of a relatively long acquisition time. The exploitation of multiple channels in parallel could in principle mitigate this issue, and at the same time it opens the way to a multi-parameter analysis of the optical signals, e.g., as a function of wavelength or spatial coordinates...
November 2016: Review of Scientific Instruments
https://www.readbyqxmd.com/read/27853723/evaluation-of-the-protective-role-of-vitamin-c-on-the-metabolic-and-enzymatic-activities-of-the-liver-in-the-male-rats-after-exposure-to-2-45-ghz-of-wi-fi-routers
#3
F Shekoohi-Shooli, S M J Mortazavi, M B Shojaei-Fard, S Nematollahi, M Tayebi
BACKGROUND: The use of devices emitted microwave radiation such as mobile phones, wireless fidelity (Wi-Fi) routers, etc. is increased rapidly. It has caused a great concern; the researchers should identify its effects on people's health. We evaluated the protective role of Vitamin C on the metabolic and enzymatic activities of the liver after exposure to Wi-Fi routers. MATERIAL AND METHODS: 70 male Wistar rats weighing 200-250 g were randomly divided into 7 groups (10 rats in each group)...
September 2016: Journal of Biomedical Physics & Engineering
https://www.readbyqxmd.com/read/27828307/nyquist-pulse-shaping-using-arrayed-waveguide-grating-routers
#4
Yiwei Xie, Leimeng Zhuang, Chen Zhu, Arthur James Lowery
We propose and demonstrate by simulations a novel Nyquist-WDM (N-WDM) superchannel transmitter based on an arrayed waveguide grating router (AWGR). This approach can generate Nyquist pulses at multiple wavelengths using a single AWGR. Results for a 3-channel 960-Gbit/s QPSK superchannel system show that a 10% guard band reduces the inter-channel interference (ICI) sufficiently. The design introduces less than 0.16-dB penalty when the waveguide loss is 2 dB/cm and 0.73-dB penalty when the standard deviation of phase error is 10°...
October 3, 2016: Optics Express
https://www.readbyqxmd.com/read/27768190/development-and-technical-validation-of-the-mobile-based-assistive-listening-system-a-smartphone-based-remote-microphone
#5
Esteban Alejandro Lopez, Orozimbo Alves Costa, Deborah Viviane Ferrari
Purpose: The purpose of this research note is to describe the development and technical validation of the Mobile Based Assistive Listening System (MoBALS), a free-of-charge smartphone-based remote microphone application. Method: MoBALS Version 1.0 was developed for Android (Version 2.1 or higher) and was coded with Java using Eclipse Indigo with the Android Software Development Kit. A Wi-Fi router with background traffic and 2 affordable smartphones were used for debugging and technical validation comprising, among other things, multicasting capability, data packet loss, and battery consumption...
October 1, 2016: American Journal of Audiology
https://www.readbyqxmd.com/read/27754380/a-hybrid-spectral-clustering-and-deep-neural-network-ensemble-algorithm-for-intrusion-detection-in-sensor-networks
#6
Tao Ma, Fen Wang, Jianjun Cheng, Yang Yu, Xiaoyun Chen
The development of intrusion detection systems (IDS) that are adapted to allow routers and network defence systems to detect malicious network traffic disguised as network protocols or normal access is a critical challenge. This paper proposes a novel approach called SCDNN, which combines spectral clustering (SC) and deep neural network (DNN) algorithms. First, the dataset is divided into k subsets based on sample similarity using cluster centres, as in SC. Next, the distance between data points in a testing set and the training set is measured based on similarity features and is fed into the deep neural network algorithm for intrusion detection...
October 13, 2016: Sensors
https://www.readbyqxmd.com/read/27739465/experimental-demonstration-of-a-quantum-shutter-closing-two-slits-simultaneously
#7
Ryo Okamoto, Shigeki Takeuchi
The interference between two paths of a single photon at a double slit is widely considered to be the most paradoxical result of quantum theory. Here is a new interesting question to the phenomenon: can a single shutter simultaneously close two slits by effectively being in a superposition of different locations? Aharonov and Vaidman have shown that it is indeed possible to construct a quantum shutter that can close two slits and reflect a probe photon perfectly when its initial and final states are appropriately selected...
October 14, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27661912/silicon-photonic-integrated-circuits-with-electrically-programmable-non-volatile-memory-functions
#8
J-F Song, A E-J Lim, X-S Luo, Q Fang, C Li, L X Jia, X-G Tu, Y Huang, H-F Zhou, T-Y Liow, G-Q Lo
Conventional silicon photonic integrated circuits do not normally possess memory functions, which require on-chip power in order to maintain circuit states in tuned or field-configured switching routes. In this context, we present an electrically programmable add/drop microring resonator with a wavelength shift of 426 pm between the ON/OFF states. Electrical pulses are used to control the choice of the state. Our experimental results show a wavelength shift of 2.8 pm/ms and a light intensity variation of ~0...
September 19, 2016: Optics Express
https://www.readbyqxmd.com/read/27557274/single-photon-transport-in-two-waveguides-chirally-coupled-by-a-quantum-emitter
#9
Mu-Tian Cheng, Xiao-San Ma, Jia-Yan Zhang, Bing Wang
We investigate single photon transport in two waveguides coupled to a two-level quantum emitter (QE). With the deduced analytical scattering amplitudes, we show that under condition of the chiral coupling between the QE and the photon in the two waveguides, the QE can play the role of ideal quantum router to redirect a single photon incident from one waveguide into the other waveguide with a probability of 100% in the ideal condition. The influences of cross coupling between two waveguides and dissipations on the routing are also shown...
August 22, 2016: Optics Express
https://www.readbyqxmd.com/read/27542181/optogenetics-in-silicon-a-neural-processor-for-predicting-optically-active-neural-networks
#10
Junwen Luo, Konstantin Nikolic, Benjamin D Evans, Na Dong, Xiaohan Sun, Peter Andras, Alex Yakovlev, Patrick Degenaar
We present a reconfigurable neural processor for real-time simulation and prediction of opto-neural behaviour. We combined a detailed Hodgkin-Huxley CA3 neuron integrated with a four-state Channelrhodopsin-2 (ChR2) model into reconfigurable silicon hardware. Our architecture consists of a Field Programmable Gated Array (FPGA) with a custom-built computing data-path, a separate data management system and a memory approach based router. Advancements over previous work include the incorporation of short and long-term calcium and light-dependent ion channels in reconfigurable hardware...
August 17, 2016: IEEE Transactions on Biomedical Circuits and Systems
https://www.readbyqxmd.com/read/27523083/slanted-gold-mushroom-array-a-switchable-bi-tridirectional-surface-plasmon-polariton-splitter
#11
Yang Shen, Guisheng Fang, Alexander Cerjan, Zhenguo Chi, Shanhui Fan, Chongjun Jin
Surface plasmon polaritons (SPPs) show great promise in providing an ultracompact platform for integrated photonic circuits. However, challenges remain in easily and efficiently coupling light into and subsequently routing SPPs. Here, we theoretically propose and experimentally demonstrate a switchable bi/tridirectional beam splitter which can simultaneously perform both tasks. The photonic device consists of a periodic array of slanted gold 'mushrooms' composed of angled dielectric pillars with gold caps extruding from a periodic array of perforations in a gold film...
August 25, 2016: Nanoscale
https://www.readbyqxmd.com/read/27519116/multiport-inp-monolithically-integrated-all-optical-wavelength-router
#12
Xiu Zheng, Oded Raz, Nicola Calabretta, Dan Zhao, Rongguo Lu, Yong Liu
An indium phosphide-based monolithically integrated wavelength router is demonstrated in this Letter. The wavelength router has four input ports and four output ports, which integrate four wavelength converters and a 4×4 arrayed-waveguide grating router. Each wavelength converter is achieved based on cross-gain modulation and cross-phase modulation effects in a semiconductor optical amplifier. Error-free wavelength switching for a non-return-to-zero 2<sup>31</sup>-1 ps eudorandom binary sequence at 40 Gb/s data rate is performed...
August 15, 2016: Optics Letters
https://www.readbyqxmd.com/read/27464197/tunable-polarization-beam-splitter-based-on-optofluidic-ring-resonator
#13
Song Zhu, Yang Liu, Lei Shi, Xinbiao Xu, Shixing Yuan, Ningyu Liu, Xinliang Zhang
An efficient polarization beam splitter (PBS) based on an optofluidic ring resonator (OFRR) is proposed and experimentally demonstrated. The PBS relies on the large effective refractive index difference between transverse-electric (TE) and transverse-magnetic (TM) polarization states, since the silica-microcapillary-based OFRR possesses a slab-like geometry configuration in the cross section through which the circulating light travels. To the best of our knowledge, this is the first OFRR-based PBS. In our work, the maximum polarization splitting ratio of up to 30 dB is achieved...
July 25, 2016: Optics Express
https://www.readbyqxmd.com/read/27454111/europaem-emf-guideline-2016-for-the-prevention-diagnosis-and-treatment-of-emf-related-health-problems-and-illnesses
#14
Igor Belyaev, Amy Dean, Horst Eger, Gerhard Hubmann, Reinhold Jandrisovits, Markus Kern, Michael Kundi, Hanns Moshammer, Piero Lercher, Kurt Müller, Gerd Oberfeld, Peter Ohnsorge, Peter Pelzmann, Claus Scheingraber, Roby Thill
Chronic diseases and illnesses associated with non-specific symptoms are on the rise. In addition to chronic stress in social and work environments, physical and chemical exposures at home, at work, and during leisure activities are causal or contributing environmental stressors that deserve attention by the general practitioner as well as by all other members of the health care community. It seems necessary now to take "new exposures" like electromagnetic fields (EMF) into account. Physicians are increasingly confronted with health problems from unidentified causes...
September 1, 2016: Reviews on Environmental Health
https://www.readbyqxmd.com/read/27418965/effect-of-radiofrequency-radiation-from-wi-fi-devices-on-mercury-release-from-amalgam-restorations
#15
Maryam Paknahad, S M J Mortazavi, Shoaleh Shahidi, Ghazal Mortazavi, Masoud Haghani
BACKGROUND: Dental amalgam is composed of approximately 50% elemental mercury. Despite concerns over the toxicity of mercury, amalgam is still the most widely used restorative material. Wi-Fi is a rapidly using local area wireless computer networking technology. To the best of our knowledge, this is the first study that evaluates the effect of exposure to Wi-Fi signals on mercury release from amalgam restorations. METHODS: Standard class V cavities were prepared on the buccal surfaces of 20 non-carious extracted human premolars...
2016: Journal of Environmental Health Science & Engineering
https://www.readbyqxmd.com/read/27383791/a-photon-photon-quantum-gate-based-on-a-single-atom-in-an-optical-resonator
#16
Bastian Hacker, Stephan Welte, Gerhard Rempe, Stephan Ritter
That two photons pass each other undisturbed in free space is ideal for the faithful transmission of information, but prohibits an interaction between the photons. Such an interaction is, however, required for a plethora of applications in optical quantum information processing. The long-standing challenge here is to realize a deterministic photon-photon gate, that is, a mutually controlled logic operation on the quantum states of the photons. This requires an interaction so strong that each of the two photons can shift the other's phase by π radians...
August 11, 2016: Nature
https://www.readbyqxmd.com/read/27362478/cache-scheme-based-on-pre-fetch-operation-in-icn
#17
Jie Duan, Xiong Wang, Shizhong Xu, Yuanni Liu, Chuan Xu, Guofeng Zhao
Many recent researches focus on ICN (Information-Centric Network), in which named content becomes the first citizen instead of end-host. In ICN, Named content can be further divided into many small sized chunks, and chunk-based communication has merits over content-based communication. The universal in-network cache is one of the fundamental infrastructures for ICN. In this work, a chunk-level cache mechanism based on pre-fetch operation is proposed. The main idea is that, routers with cache store should pre-fetch and cache the next chunks which may be accessed in the near future according to received requests and cache policy for reducing the users' perceived latency...
2016: PloS One
https://www.readbyqxmd.com/read/27355805/exacerbation-of-demyelinating-syndrome-after-exposure-to-wireless-modem-with-public-hotspot
#18
Olle Johansson, Mary Redmayne
In August 2003, 48-year-old JS of Colorado, USA, a fitness therapist and sports nutritionist, contracted neuroinvasive West Nile virus which left her with disabilities due to spinal axonal damage.In August 2014, she suddenly developed symptoms very much like her acute West Nile infection 11 years ago, including focal seizures, ataxia, vertigo and headaches. Her blood count looked normal so there was no obvious infection. What struck her as odd was that when she left her apartment for any length of time, the symptoms stopped...
2016: Electromagnetic Biology and Medicine
https://www.readbyqxmd.com/read/27352772/a-broadband-terahertz-waveguide-t-junction-variable-power-splitter
#19
Kimberly S Reichel, Rajind Mendis, Daniel M Mittleman
In order for the promise of terahertz (THz) wireless communications to become a reality, many new devices need to be developed, such as those for routing THz waves. We demonstrate a power splitting router based on a parallel-plate waveguide (PPWG) T-junction excited by the TE1 waveguide mode. By integrating a small triangular septum into the waveguide plate, we are able to direct the THz light down either one of the two output channels with precise control over the ratio between waveguide outputs. We find good agreement between experiment and simulation in both amplitude and phase...
2016: Scientific Reports
https://www.readbyqxmd.com/read/27336059/linear-time-vertex-partitioning-on-massive-graphs
#20
Peter Mell, Richard Harang, Assane Gueye
The problem of optimally removing a set of vertices from a graph to minimize the size of the largest resultant component is known to be NP-complete. Prior work has provided near optimal heuristics with a high time complexity that function on up to hundreds of nodes and less optimal but faster techniques that function on up to thousands of nodes. In this work, we analyze how to perform vertex partitioning on massive graphs of tens of millions of nodes. We use a previously known and very simple heuristic technique: iteratively removing the node of largest degree and all of its edges...
2016: International Journal of Computer Science (Rabat)
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