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Analyzing the Evolution of the Internet 17

Analyzing the Evolution of the Internet

引用

17th Eurographics Conference on Visualization, EuroVis 2015

作者： Johnson, Thienne Acedo, Carlos Kobourov, Stephen Nusrat, Sabrina Dept. of Computer Science University of Arizona United States Dept. of Elec. and Computer Engineering University of Arizona United States

Existing representations of the Internet do not provide information on why countries have a bigger Internet presence (e.g., Internet Service Providers) than others. In this paper we evaluate four geo-economic parameters (area, population, GDP and GDP per capita), looking for clues of why some areas or countries have developed earlier/later, faster/slower than others. We use correlation studies to analyze which geo-economic variable leads to bigger development in the Internet infrastructure per continent, and cartograms to represent the growth of the Internet infrastructure around the world, in a sequence of 24 years. These representations make it possible to find interesting patterns and identify outliers. © The Eurographics Association 2015.

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A novel CDMA based high performance reversible data hiding scheme 16

A novel CDMA based high performance reversible data hiding s...

引用

4th ACM Information Hiding and Multimedia Security Workshop, IH and MMSec 2016

作者： Ma, Bin Xu, Jian Shi, Yun Q. School of Information Science Qilu University of Technology 3501 Daxue Road Jinan250353 China School of Computer and Information Shandong Univ. of Fina. and Econ. 7366 Bicyclic East Road Jinan250014 China Dept. of Elec. and Comp. Engineering New Jersey Institute of Technology University Heights NewarkNJ07102 United States

ISBN: (纸本)9781450342902

In this paper, based on the principle of Code Division Multiple Access (CDMA), a novel reversible data hiding scheme is presented. The to-be-embedded data are represented by different orthogonal spreading sequences and embedded into a cover image while degrading the image quality slightly. According to the feature of orthogonality, different spreading sequences are repeatedly embedded into the image without disturbing each other, and most elements of different spreading sequences are mutually cancelled in the process of multilevel data embedding. Thus, it keeps the distortion of the embedded image at a relatively low level even with a high embedding capacity. Moreover, the location-map of the proposed scheme can be highly compressed and thus the size is quite small;it further helps to obtain high net embedding capacity. Experimental results have demonstrated that the CDMA based reversible data hiding scheme can achieve higher image quality at the moderate-To-high embedding capacity than other state-of-The-Art reversible data hiding works. © 2016 ACM.

关键词： Code division multiple access

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Discontinuous PWM in Single-phase Grid-connected Inverter

Discontinuous PWM in Single-phase Grid-connected Inverter

引用

IEEE Conference on Industrial elec.ronics and Applications

作者： Xi-jun YANG Hao QU Hou-junTang Bin-ruo ZHU Jian-feng JIANG Zhi-hong JIANG Dept. of Electrical Engineering Shanghai Jiao Tong University Electric Power Science Research Institute Shanghai electric power company School of Elec. & Information Engineering Changchun Institute of Technology

ISBN: (纸本)9781467386456

Single-phase grid-connected inverter (GCI) is a kind of single-phase voltage source converter (VSC), and as the indispensable tie unit between different power supplies, it is widely used in the fields of wind generation and solar PV generation. In the paper, as first, on the basis of the concept of the discontinuous pulse-width modulation (DPWM) for three-phase VSI, a new DPWM of single-phase GCI is presented by means of zero-sequence component injection. Then, the transformation from stationary frame (abc) to rotating frame (dq) is designed after reconstructing the other orthogonal current by means of one order all-pass filter. Finally, the presented DPWM based single-phase GCI is established, analyzed and simulated by means of MATLAB/SIMULINK. The simulation results show the validation of the above modulation algorithms, and the DPWM based single-phase GCR has reduced power loss and increased efficiency.

关键词： Voltage source inverter Grid-connected inverter Zero-sequence component Discontinuous pulse width modulation Abc-dq coordinate transformation Slide mode control

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Auditory image model for the characterisation of obstructive sleep apnoea 12

Auditory image model for the characterisation of obstructive...

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12th IASTED International Conference on Biomedical engineering, BioMed 2016

作者： Emoto, Takahiro Abeyratne, Udantha R. Shono, Takeshi Nonaka, Ryo Jinnouchi, Osamu Kawata, Ikuji Akutagawa, Masatake Kinouchi, Yohsuke Institute of Tech. and Science Tokushima University 2-1 Minamijyousanjima-cho Tokushima Japan School of Info. Tech. and Elec. Engineering Univ. of Queensland St Lucia BrisbaneQLD Australia Graduate School of Advanced Tech. and Science Tokushima Univerisity Tokushima Japan Dept. of Otorhinolaryngology Anan Kyoei Hospital Hanoura-cho Naka-gun Tokushima Japan

ISBN: (纸本)9780889869813

Snoring is one of the major symptoms of Obstructive sleep apnea syndrome (OSAS) which is associated with serious health consequences. In recent years, speech-like analysis of snores has been performed towards an alterative to polysomnography (PSG) which is considered the gold standard in the diagnosis of OSAS. Human auditory perception has the ability to distinguish between different sounds. In this study, we propose a new method to extract snores from the sound recordings and characterize OSAS using auditory image model, which represents human auditory processing. Our proposed techniques resulted in a sensitivity of 98.4% and specificity of 94.06% for snore and non-snore classification and sensitivity of 85.00±26.87 at a specificity of 95.00±15.81 % for OSAS and non-OSAS classification. These results may indicate the feasibility of developing an OSAS population-screening tool based on automated analysis of non-contact snore.

关键词： Sleep research

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EPC Gen-2 UHF RFID tags with low-power CMOS temperature sensor suitable for gas applications

EPC Gen-2 UHF RFID tags with low-power CMOS temperature sens...

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Annual IEEE Northeast Workshop on Circuits and Systems (NEWCAS)

作者： Mohamed Zgaren Saqib Mohamad Abbes Amira Mohamad Sawan Dept. of Elec. Eng. Polytechnique Montreal QC Canada Dept. of ECE Hong Kong University of Science and Technology Clear Water Bay Hong Kong College of Engineering Qatar University Doha Qatar

This paper presents a passive RFID tag with an embedded temperature sensor intended for the EPC Gen-2 protocol operating in the 902-928 MHz ISM band. The design is implemented as a node of a low cost temperature sensors network. The system is powered by a remote power through the RF energy received from the reader in order to create autonomous temperature measurement micro systems. The temperature sensor is based on ring oscillator using CMOS thyristor delay element. The energy recovery and power distribution unit of the RFID tag provides different supply voltages in order to optimize the performance and the power consumption of each building block. Amplitude Shift Keying (ASK) modulation architecture is adopted for Radio Frequency (RF) link which uses an envelope detector and non-coherent demodulation technique. For the temperature sensor, Low power operation is achieved by eliminating the use of power hungry Analog to Digital Converters (ADCs) at the sensor output. The design architecture is fully compliant to the EPC Gen-2 standard. The error in temperature sensing is around -1.8°C/+1°C, with a resolution of 0.3°C. The RFID tag achieves a sensitivity of -11 dBm with an input data rate up to 200 kbps from 1.8V. 0.5Vwas used as supply voltage for the temperature sensor to ensure the low power consumption as well as robustness. The proposed UHF RFID tag is implemented and simulated in 0.18μmCMOS process.

关键词： Temperature sensors RFID tags Delays Power demand Integrated circuits Standards Oscillators

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Design and Implementation of BPSK MODEM for IEEE 802.15.4/ZigBee Devices

Design and Implementation of BPSK MODEM for IEEE 802.15.4/Zi...

引用

IEEE Canadian Conference on elec.rical and computer engineering

作者： Haytham Elmiligi M. Watheq El-Kharashi Fayez Gebali Computer Science Dept. Thompson Rivers University Kamloops BC Canada Comp. and Sys. Eng. Dept. Ain Shams University Cairo Egypt Elec. and Comp. Eng. Dept. University of Victoria Victoria BC Canada

ISBN: (纸本)9781467387224

ZigBee is one of the latest technologies used in Wireless Personal Area Networks (WPAN). Designing an energy scalable ZigBee System on a Chip (SoC) is a demanding request for low power wireless sensor networks applications. In this paper, we focus on the main hardware module of the physical (PHY) layer of IEEE 802.15.4/ZigBee devices, which is the binary phase shift keying (BPSK) modem for 868 MHz band. We propose a new multiplier-less design for an FPGA-based BPSK modem using VHDL language. A digital signal-processing technique is used in order to generate and detect the BPSK symbols. Although, the BPSK demodulator is designed to match ZigBee PHY layer standard requirements, it can be used for other applications with very simple modifications. The proposed design is validated through the implementation on the AMIRIX AP1000 development platform.

关键词： Binary phase shift keying ZigBee Modems hardware module Wireless personal area networks latest technology system-on-chip INSTITUTE OF elec.RICAL AND elec.RONIC ENGINEERS

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Automatic detection of basal cell carcinoma using vascular-extracted features from dermoscopy images

Automatic detection of basal cell carcinoma using vascular-e...

引用

Canadian Conference on elec.rical and computer engineering (CCECE)

作者： Pegah Kharazmi Harvey Lui Z. Jane Wang Tim K. Lee Dept. of Elec. & Comp. Engineering Univ.of British Columbia Vancouver Canada Dept. of Dermatology & Skin Science Univ. of British Columbia Vancouver Canada Cancer Control Research Program BC Cancer Agency Vancouver Canada

ISBN: (纸本)9781467387224

Basal cell carcinoma (BCC) is the most common type of skin cancer. Timely diagnosis of BCC is an important factor in the prognosis of the disease. A key to BCC diagnosis are vascular structures of the lesion. Detection and recognition of cutaneous vasculature provide critical information on diagnosis accuracy and assessment precision. In this paper, we present an effective method to extract vascular information towards lesion diagnosis. Given a dermoscopy image, we first segment vascular structures of the lesion by decomposing the image using independent component analysis into melanin and hemoglobin components and further applying shape filters at different scales. A vessel mask is generated as a result of global thresholding. A set of vascular features are then extracted from the final vessel image of the lesion and fed into a Random Forest classifier. The method demonstrates performance of 90.3% in terms of AUC in differentiating BCC from benign lesions.

关键词： Skin Lesions Image segmentation Feature extraction Image color analysis Biomedical imaging Blood vessels

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Feasibility study of robotically tracked photoacoustic computed tomography

Feasibility study of robotically tracked photoacoustic compu...

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Medical Imaging 2015: Ultrasonic Imaging and Tomography

作者： Zhang, Haichong K. Aalamifar, Fereshteh Kang, Hyun Jae Boctor, Emad M. Dept. of Computer Science Johns Hopkins Univ. BaltimoreMD United States Dept. of Elec. and Computer Engineering Johns Hopkins Univ. BaltimoreMD United States Dept. of Radiology Johns Hopkins Univ. BaltimoreMD United States

ISBN: (纸本)9781628415094

Photoacoustic imaging (PA) is becoming a promising modality for pre-clinical and clinical application by providing functional information with high penetration dept.. In particular, PA computed tomography (PACT) aims to visualize the photoacoustic source distribution by scanning ultrasound transducers around a surface of the structure. Placing transducers around the subject or rotating the subject with fixing transducer position are two major approaches to scan in circular arc trajectory, but both are not flexible and have their drawbacks. To resolve the problem, we propose a new scanning method based on the robotic tracking technique. High flexibility of the scanning geometry is available because the trajectory of the tracked transducer generated by robot motion will be regarded as the scanning path. A simulation study of proposed method is conducted, assuming a 6cm array ultrasound transducer was used as receivers. To replicate the scenario that the probe is moved by robot, the probe is placed at two positions across a designated rotation angle, and received signals at both positions are used to generate an image. Compared to the result without robot motion, the lateral resolution of the target drastically improved due to aperture extension. In addition, the effect of error in one of the pose in lateral and axial direction was also simulated. Finally, an experiment was conducted to demonstrate the feasibility of the system. The result indicates that the ultrasound calibration is required to the system, and the robotically tracked PACT has a huge potential to be a new scanning strategy. © 2015 SPIE.

关键词： Scanning

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Observation model based perceptually motivated bilateral filter for image reconstruction

Observation model based perceptually motivated bilateral fil...

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IEEE International Conference on Digital Signal Processing, DSP 2015

作者： Jakhetiya, Vinit Lin, Weisi Jaiswal, Sunil P. Tiwari, Anil K. Guntuku, Sharath C. Dept. of Elec. and Comp. Engineering Hong Kong Uni. of Science and Tech. Hong Kong School of Computer Engineering Nanyang Technological University Singapore Faculty of Electrical Engineering Indian Institute of Technology Jodhpur India

ISBN: (纸本)9781479980581

Recently, a lot of bilateral and non-local means based reconstruction algorithms are proposed in literature. The success of these filters lies in finding similar patches in the neighbourhood. However, in complex regions and in presence of noise, finding similar patches based on mean square error (MSE) is not reliable. This results into blurred edges and visible patches in the reconstructed image. To address this issue, we propose a new Observation model based and Perceptually Motivated Bilateral Filter (OPBIF) for Image Reconstruction. In which image quality assessment (IQA) matrices are used to find the similarity among the patches. From experimental results, it is validated that the proposed algorithm has the capability of reconstructing sharp edges, as compared to existing non-linear filtering algorithms. © 2015 IEEE.

关键词： Image reconstruction

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On isotropic circular arrays of anisotropic sensors

On isotropic circular arrays of anisotropic sensors

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IEEE International Symposium on Signal Processing and Information Technology (ISSPIT)

作者： Houcem Gazzah Jean Pierre Delmas Dept. of Elec. and Computer Engineering University of Sharjah Sharjah UAE

Uniform circular arrays are popular in direction finding applications because they show to be isotropic, i.e. they exhibit the same accuracy (in terms of the Cramer-Rao bound) at all possible planar look directions. We prove that this is not absolutely true if the constituent sensors are not isotropic. For instance, we specify how the anisotropic sensors should be directed and how many are needed in order to ensure an isotropic behavior of the array. We study, in more details, the performance of arrays of cardioid sensors, including anisotropic arrays of cardioid sensors.

关键词： Sensor arrays Estimation Direction-of-arrival estimation Antenna arrays Array signal processing Geometry

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