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IEEE International Conference on Electronics, Circuits, and Systems

作者： Israel Sperotto Hamilton Klimach Sergio Bampi Microelectronics Graduate Program Federal University of Rio Grande do Sul Electrical Engineering Department Federal University of Rio Grande do Sul Informatics Institute Federal University of Rio Grande do Sul

ISBN: (纸本)9781509002474

This work presents the design of a 6 bits M-2M ladder Digital-to-Analog Converter (DAC) proper for operation under supply voltages of 200 mV or lower. Since the MOS transistors are operating in the subthreshold region under such low supply, the mismatch analysis was done using an all-region continuous MOSFET model. The performance of the circuit is evaluated through simulations and the trade-offs between linearity, supply voltage and sampling rate are investigated in the paper. It is proposed that a 6 bits M-2M DAC operating under 200 mV and with sampling rate of 5.1MS/s is feasible using a commercial 130 nm process and standard transistors.

关键词： supply voltage metal-oxide-semiconductor field effect transistors DERIVED AIR CONCENTRATION Development Assistance Committee sampling rate Linearity Drill bits

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An effective algorithm for computing all-terminal reliability bounds

An effective algorithm for computing all-terminal reliabilit...

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作者： Silva, Jaime Gomes, Teresa Tipper, David Martins, Lúcia Kounev, Velin Department of Informatics Engineering CISUC University of Coimbra Põlo 2 Pinhal de Marrocos Coimbra3030-290 Portugal Department of Physics CFC University of Coimbra Coimbra3004-516 Portugal Department of Electrical and Computer Engineering University of Coimbra Põlo 2 Pinhal de Marrocos Coimbra3030-290 Portugal INESC Coimbra Rua Antero de Quental 199 Coimbra3000-033 Portugal Graduate Telecommunications and Networking Program University of Pittsburgh PittsburghPA15260 United States

The exact calculation of all-terminal reliability is not feasible in large networks. Hence estimation techniques and lower and upper bounds for all-terminal reliability have been utilized. Here, we propose using an ordered subset of the mincuts and an ordered subset of the minpaths to calculate an all-terminal reliability upper and lower bound, respectively. The advantage of the proposed new approach results from the fact that it does not require the enumeration of all mincuts or all minpaths as required by other bounds. The proposed algorithm uses maximally disjoint minpaths, prior to their sequential generation, and also uses a binary decision diagram for the calculation of their union probability. The numerical results show that the proposed approach is computationally feasible, reasonably accurate and much faster than the previous version of the algorithm. This allows one to obtain tight bounds when it not possible to enumerate all mincuts or all minpaths as revealed by extensive tests on real-world networks. © 2015 Wiley Periodicals, Inc. NETWORKS, Vol. 66(4), 282-295 2015.

关键词： Binary decision diagrams

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The Role of Certainty and Time Delay in Students' Cheating Decisions during Online Testing 37

The Role of Certainty and Time Delay in Students' Cheating D...

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37th Annual Meeting of the Cognitive Science Society: Mind, Technology, and Society, CogSci 2015

作者： Chuang, Chia-Yuan Craig, Scotty D. Femiani, John Arizona State University Simulation Modeling and Applied Cognitive Science Program 7171 E Sonoran Arroyo Mall MesaAZ85212 United States Arizona State University Human Systems Engineering 7171 E Sonoran Arroyo Mall MesaAZ85212 United States Arizona State University School of Computing Informatics and Decision System Engineering Peralta Hall 7171 E Sonoran Arroyo Mall Rm 230U MesaAZ85212 United States

ISBN: (纸本)9780991196722

In an attempt to assist proctors to prevent test takers from academic dishonesty in remotely administrated exams, this study investigated the ability of test takers' behaviors during online assessments to predict their cheating decisions. Specifically, this experimental study focused on the role of students' time delay and certainty rating during lab based online testing sessions. The analysis of hierarchical logistic regression indicated that not only time delay but also certainty rating had significantly statistical relation to test takers' cheating decisions. The importance of the two proposed factors during online assessments was discussed and the prospects of the improvements of online proctoring systems were addressed. © Cognitive Science Society, CogSci *** rights reserved.

关键词： Time delay

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Feature extraction methods for batik pattern recognition: A review

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AIP Conference Proceedings 2016年第1期1755卷

作者： Anita Ahmad Kasim Retantyo Wardoyo Agus Harjoko 1Doctoral Program of Department of Computer Sciences and Electronics Instrumentations Universitas Gadjah Mada Yogyakarta Indonesia 2Department of Informatics Engineering Faculty of Engineering Universitas Tadulako Palu Indonesia 3Department of Computer Sciences and Electronics Instrumentations Faculty of Mathematics and Natural Sciences Universitas Gadjah Mada Yogyakarta Indonesia

Batik is one of the world’s cultural heritages with various decorative patterns. Each batik has its unique pattern characteristic such as color intensity, ornament visualisation and ornament size. Batik with a large-sized ornament and a high-intensity color on its background will result in a clear edge and easy-to-recognise ornaments. While batik with a small-sized ornament and a low-intensity color of the background will produce slight edge ornaments, thus it becomes difficult to recognise. In order to recognise any patterns of batik, some features that can represent each pattern are becomes necessary. Batik pattern features can be obtained from various methods of feature extraction. This paper will address various methods of feature extraction of batik for recognising batik patterns. These methods of feature extraction are categorised into several groups based on visual features produced by batik including feature extraction of color, texture formed in batik, and shape of batik ornament. The grouping of extraction methods in batik aims to describe the methods for extracting features from batik pattern to improve the recognition level of batik pattern.

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Microphone-accelerometer based 3D posture estimation for a hose-shaped rescue robot

Microphone-accelerometer based 3D posture estimation for a h...

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IEEE/RSJ International Conference on Intelligent Robots and Systems

作者： Y. Bando K. Itoyama M. Konyo S. Tadokoro K. Nakadai K. Yoshii H. G. Okuno Graduate School of Informatics Kyoto University Kyoto Japan Graduate School of Information Science Tohoku University Miyagi Japan Graduate School of Information Science and Engineering Honda Research Institute Japan Co. Ltd. Saitama Japan Graduate Program for Embodiment Informatics Waseda University Tokyo Japan

3D posture estimation for a hose-shaped robot is critical in rescue activities due to complex physical environments. Conventional sound-based posture estimation assumes rather flat physical environments and focuses only on 2D, resulting in poor performance in real world environments with rubble. This paper presents novel 3D posture estimation by exploiting microphones and accelerometers. The idea of our method is to compensate the lack of posture information obtained by sound-based time-difference-of arrival (TDOA) with the tilt information obtained from accelerometers. This compensation is formulated as a nonlinear state-space model and solved by the unscented Kalman filter. Experiments are conducted by using a 3m hose-shaped robot with eight units of a microphone and an accelerometer and seven units of a loudspeaker and a vibration motor deployed in a simple 3D structure. Experimental results demonstrate that our method reduces the errors of initial states to about 20 cm in the 3D space. If the initial errors of initial states are less than 20 %, our method can estimate the correct 3D posture in real-time.

关键词： Microphones Accelerometers Loudspeakers Estimation Robot sensing systems Three-dimensional displays

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Human-voice enhancement based on online RPCA for a hose-shaped rescue robot with a microphone array

Human-voice enhancement based on online RPCA for a hose-shap...

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IEEE International Workshop on Safety, Security, and Rescue Robotics (SSRR)

作者： Yoshiaki Bando Katsutoshi Itoyama Masashi Konyo Satoshi Tadokoro Kazuhiro Nakadai Kazuyoshi Yoshii Hiroshi G. Okuno Graduate School of Informatics Kyoto University Kyoto Japan Graduate School of Information Science Honda Research Institute Japan Co. Ltd Miyagi Japan Graduate School of Information Science and Engineering Tokyo Institute of Technology Saitama Japan Graduate Program for Embodiment Informatics Waseda University Tokyo Japan

This paper presents an online real-time method that enhances human voices included in severely noisy audio signals captured by microphones of a hose-shaped rescue robot. To help a remote operator of such a robot pick up a weak voice of a human buried under rubble, it is crucial to suppress the loud ego-noise caused by the movements of the robot in real time. We tackle this task by using online robust principal component analysis (ORPCA) for decomposing the spectrogram of an observed noisy signal into the sum of low-rank and sparse spectrograms that are expected to correspond to periodic ego-noise and human voices. Using a microphone array distributed on the long body of a hose-shaped robot, ego-noise suppression can be further improved by combining the results of ORPCA applied to the observed signal captured by each microphone. Experiments using a 3-m hose-shaped rescue robot with eight microphones show that the proposed method improves the performance of conventional ego-noise suppression using only one microphone by 7.4 dB in SDR and 17.2 in SIR.

关键词： Rescue robots Microphone arrays Matrix decomposition Radio frequency Mobile robots

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Triaxial MMG investigation during FES-induced cycle movements

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Journal of Physics: Conference Series 2016年第1期705卷

作者： M C Gelain G N Nogueira-Neto P Nohama P M Gewehr Master's student of Electrical Engineering and Industrial Informatics at UTFPR (Rehabilitation engineering laboratory phone: +55 (41) 3310-4489) Brazil PhD in Biomedical Engineering researcher and professor of Computer Engineering at Pontifícia Universidade Católica do Paraná (PUCPR) Brazil PhD in Biomedical Engineering researcher and full professor at the PPGTS stricto sensu program at Pontifícia Universidade Católica do Paraná (PUCPR) Brazil PhD in Medical Physics Bioengineering and professor of Biomedical engineering at UTFPR Brazil

Spinal cord injury is damage to the spinal cord that results in loss of functions, causes muscle, joint and bone deficits, moreover it increases the muscle tone level. FEScycling is an alternative rehabilitation process to conserve the musculoskeletal system affected by the injury in the functional state. The aim of this study is to get the legs bilaterally synchronized by FES and compare MMG signal responses. The preliminary protocol consists of five consecutive contractions. The first and the last contractions were discarded and the three intermediate contractions were analyzed. A ratio between MMG values of muscle responses during propulsion and return of pedalling phases was calculated for each cycle and each leg. The applied FES profile consisted of pulse and burst on time of 250 us and 5 ms and frequencies of 1000 Hz and 20 Hz, respectively. Results showed that greater MMG RMS values tend to occur during the propulsion phase than in the return phase. MMG Z axis of RLL and MMG X axis of LLL were the axes that presented the greatest ratios. The MMG RMS signal showed that greater values tend to occur during the propulsion phase than in the return phase of the same thigh.

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Erratum to: Optimal surveillance network design: a value of information model

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Complex Adaptive Systems Modeling 2016年第1期4卷 1-1页

作者： Matteo Convertino Yang Liu Haejin Hwang School of Public Health Environmental Health Sciences Division and Public Health Informatics Program HumNat Lab University of Minnesota Minneapolis USA Institute on the Environment University of Minnesota Minneapolis USA Institute for Engineering in Medicine University of Minnesota Minneapolis USA Academic Health Center Minneapolis USA

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Identification of K most vulnerable nodes in multi-layered network using a new model of interdependency

Identification of K most vulnerable nodes in multi-layered n...

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2014 IEEE Conference on Computer Communications Workshops, INFOCOM WKSHPS 2014

作者： Sen, Arunabha Mazumder, Anisha Banerjee, Joydeep Das, Arun Compton, Randy Computer Science and Engineering Program School of Computing Informatics and Decision System Engineering Arizona State University Tempe AZ 85287 United States

ISBN: (纸本)9781479930883

The critical infrastructures of a nation including the power grid and the communication network are highly interdependent. Recognizing the need for a deeper understanding of the interdependency in a multi-layered network, significant efforts have been made by the research community in the last few years to achieve this goal. Accordingly a number of models have been proposed and analyzed. Unfortunately, most of the models are over simplified and, as such, they fail to capture the complex interdependency that exists between entities of the power grid and the communication networks involving a combination of conjunctive and disjunctive relations. To overcome the limitations of existing models, we propose a new model that is able to capture such complex interdependency relations. Utilizing this model, we provide techniques to identify the K most 'vulnerable' nodes of an interdependent network. We show that the problem can be solved in polynomial time in some special cases, whereas for some others, the problem is NP-complete. We establish that this problem is equivalent to computation of a fixed point of a multilayered network system and we provide a technique for its computation utilizing Integer Linear programming. Finally, we evaluate the efficacy of our technique using real data collected from the power grid and the communication network that span the Maricopa County of Arizona. © 2014 IEEE.

关键词： Complex networks

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A body-machine interface for training selective pelvis movements in stroke survivors: a pilot study

A body-machine interface for training selective pelvis movem...

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Annual International Conference of the IEEE engineering in Medicine and Biology Society

作者： S. Summa C. Pierella P. Giannoni A. Sciacchitano S. Iacovelli A. Farshchiansadegh F. A. Mussa-Ivaldi M. Casadio the Department of Informatics Bioengineering Robotics and System Engineering at the University of Genoa 16145 Genoa Italy the ART Education and Rehab Center Genoa Italy the Sensory Motor Performance Program Rehabilitation Institute of Chicago Chicago IL 60611 USA. the Sensory Motor Performance Program Rehabilitation Institute of Chicago Chicago IL 60611 USA

ISBN: (纸本)9781424492695

The body-machine interfaces (BMIs) map the subjects' movements into the low dimensional control space of external devices to reach assistive and/or rehabilitative goals. This work is a first proof of concept of this kind of BMI as tool for rehabilitation after stroke. We designed an exercise to improve the control of selective movements of the pelvis in stroke survivors, increasing the ability to decouple the motion in the sagittal and frontal planes and decreasing compensatory adjustments at the shoulder girdle. A Kinect sensor recorded the movements of the subjects. Subjects played different games by controlling the vertical and horizontal motion of a cursor on a screen with respectively the lateral tilt and the ante/retroversion of their pelvis. We monitored also the degrees of freedom not directly involved in cursor control, thus subjects could complete the task only with a correct posture. Our preliminary results highlight significant improvement not only in cursor control, but also in the Trunk Impairment Scale (TIS) and in the Five Times Sit to Stand Test (5xSST).

关键词： TIS 5xSST BMI Pelvis cursor control Movements proof of concept Stroke Pilot Studies Body Mass Index Horizontal motion BMI CONSOLE first proofs Survivors nonius

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