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Evaluation of a calculation method of noise exposure from communication headsets

The Journal of the Acoustical Society of America 2017年第5_SUPPLEMENT期141卷 3731-3732页

作者： Hilmi R. Dajani Flora G. Nassrallah Caroline Chabot Nicolas N. Ellaham Christian Giguère School of Elec. Eng. and Comput. Sci. Univ. of Ottawa Ottawa ON K1N6N5 Canada hdajani@site.uottawa.ca Hearing Res. Lab. Univ. of Ottawa Ottawa ON Canada Audiology/SLP Program Univ. of Ottawa Ottawa ON Canada

Specialized standardized methods for the measurement of noise exposure from communication headsets or sound sources close to the ear include the Microphone in Real Ear and manikin techniques, as specified in ISO 11904-1/2. The 2013 version of Canadian standard Z107.56 introduced a simpler calculation method to increase accessibility to communication headset exposure assessments for the widest range of stakeholders in hearing loss prevention. The calculation method only requires general and widely accessible sound measurement equipment and basic comput.tional steps that account for the main determinants of exposure such as the background noise around the user, the sound attenuation of the communication headset, and the expected communication duration and effective listening signal-to-noise ratio. This paper reviews recent research on the effects of the spectral and temporal characteristics of the background noise and the headset configuration on the speech listening level. Results indicate that the listening level is largely insensitive to spectral and temporal variations in the background noise and that A-weighted noise level is a good predictor of listening level once headset attenuation is taken into account. It is also found that one-sided headsets increase exposure by 6-7 dB compared to two-sided headsets due to binaural summation.

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ZCCloud: Exploring Wasted Green Power for High-Performance comput.ng

ZCCloud: Exploring Wasted Green Power for High-Performance C...

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IEEE International Parallel and Distributed Processing Symposium

作者： Fan Yang Andrew A. Chien Dept. of Comput. Sci. Univ. of Chicago Chicago IL USA Math & Comput. Sci. Argonne Nat. Lab. Argonne IL USA

ISBN: (纸本)9781509021413

In supercomput.r centers, available power, cooling, or carbon footprint often limits supercomput.r performance. We propose a new approach to continue scaling that avoids many of these limits, augmenting a traditional system with another that employs only "wasted" renewable power, stranded power. This excess power cannot be economically distributed through grid, and is only intermittently available. We call this approach Zero-carbon Cloud (ZCCloud). We explore the potential benefits of unreliable resources with production DOE HPC workloads using a simple periodic model, and identify job types that benefit most (capability jobs and on-time jobs). The benefits scale with duty factor and resource quantity. Next, to create realistic models of "stranded power" we study 28 months of Mid-continent Independent System Operator (MISO) power market history (1,259 generators, 77 million 5-minute intervals). We find that opportunity varies, but the best single wind site can provide 80% duty factor, and 20MW average stranded power. Combining sites further improves duty factor. With resource volatility models from the MISO study, we simulate production DOE HPC workloads and find that stranded power HPC, ZCCloud, can provide significant benefit, decreasing average job-wait time by 50%.

关键词： High-Performance comput.ng Cloud Power Grid Batch Scheduling Power limits

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Exposing Inpainting Forgery in JPEG Images under Recompression Attacks

Exposing Inpainting Forgery in JPEG Images under Recompressi...

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IEEE International Conference on Machine Learning and Applications

作者： Qingzhong Liu Bing Zhou Andrew H. Sung Mengyu Qiao Dept. of Comput. Sci. Sam Houston State Univ. Huntsville TX USA Sch. of Comput. Univ. of Southern Mississippi Hattiesburg MS USA Dept. of Math. & Comput. Sci. South Dakota Sch. of Mines & Technol. Rapid City SD USA

ISBN: (纸本)9781509061686

Inpainting, originally designed in comput.r vision to reconstruct lost or deteriorated parts of images and videos, has been used for image tampering, including region filling and object removal to alter the truth. While several typ~(es) of tampering including copy-move and seam carving forgery can now be successfully exposed in image forensics, there has been very little study to tackle inpainting forgery in JPEG images, the detection of which is extremely challenging due to the post-recompression attacks performed to cover or compromise original inpainting traces. To date, there is no effective way to detect inpainting image forgery under combined recompression attacks. To fill such a gap in image forensics and reveal inpainting forgery from the post-recompression attacks in JPEG images, we propose in this paper an approach that begins with large feature mining in discrete transform domain, ensemble learning is then applied to deal with the high feature dimensionality and to prevent the overfitting that generally happens to some regular classifiers under high feature dimensions. Our study shows the proposed approach effectively exposes inpainting forgery under post recompression attacks;especially, it noticeably improves the detection accuracy while the recompression quality is lower than the original JPEG image quality, and thus bridges a gap in image forgery detection.

关键词： inpainting combination forgery JPEG recompression image forgery detection

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Idle Period Propagation in Message-Passing Applications

Idle Period Propagation in Message-Passing Applications

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IEEE International Conference on High Performance comput.ng and Communications

作者： Ivy Bo Peng Stefano Markidis Erwin Laure Gokcen Kestor Roberto Gioiosa Dept. of Comput. Sci. & Technol. KTH R. Inst. of Technol. Stockholm Sweden Comput. Sci. & Math. Div. Pacific Northwest Nat. Lab. Richland WA USA

ISBN: (纸本)9781509042982

Idle periods on different processes of Message Passing applications are unavoidable. While the origin of idle periods on a single process is well understood as the effect of system and architectural random delays, yet it is unclear how these idle periods propagate from one process to another. It is important to understand idle period propagation in Message Passing applications as it allows application developers to design communication patterns avoiding idle period propagation and the consequent performance degradation in their applications. To understand idle period propagation, we introduce a methodology to trace idle periods when a process is waiting for data from a remote delayed process in MPI applications. We apply this technique in an MPI application that solves the heat equation to study idle period propagation on three different systems. We confirm that idle periods move between processes in the form of waves and that there are different stages in idle period propagation. Our methodology enables us to identify a self-synchronization phenomenon that occurs on two systems where some processes run slower than the other processes.

关键词： Message Passing applications self-synchronization idle period propagation process imbalance

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An Instructional Unit for Teaching Project Management Tools Aligned with PMBOK

An Instructional Unit for Teaching Project Management Tools ...

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Conference on Software Engineering Education & Training (CSEE&T)

作者： Rafael Queiroz Goncalves Christiane Gresse Von Wangenheim Grad. Program on Comput. Sci. Federal University of Santa Catarina (UFSC) Florianópolis SC Brazil Grad. Program on Comput. Sci. Federal University of Santa Catarina (UFSC) Florianopolis Brazil

Project Management (PM) tools are necessary to manage contemporary software projects. comput.r professionals need to know how to use these tools, and higher-education comput.r courses teach their usage. Therefore, educators often adopt general usage tools, such as MS Project. However, as such tools lack didactic features, educational PM tools have been developed. Yet, previous studies have shown that even instructional units (IU) based on such educational PM tools do not cover the entire PM process as defined by PMBOK. This article presents an instructional unit based on an open-source educational PM tool, dotProject+, using the tool to support learning a large part of the PM process. We describe the instructional design process used to develop the IU, as well as the evaluation of the IU in a series of case studies. The results indicate that this IU contributes to student learning and assists teachers.

关键词： Education Open source software Organizations Software engineering Project management comput.rs

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A Blind Antenna Selection Scheme for Single-cell Uplink Massive MIMO

A Blind Antenna Selection Scheme for Single-cell Uplink Mass...

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IEEE Globecom Workshops

作者： Khalil Elkhalil Abla Kammoun Tareq Y. Al-Naffouri Mohamed-Slim Alouini Comput. Electr. & Math. Sci. & Eng. (CEMSE) Div King Abdullah Univ. of Sci. & Technol. Thuwal Saudi Arabia

ISBN: (纸本)9781509024834

This paper considers the uplink of a single-cell large-scale multiple-input multiple output (MIMO) system in which m mono-antenna users communicate with a base station (BS) outfitted by n antennas. We assume that the number of antennas at the BS and that of users take large values, as envisioned by large-scale MIMO systems. This allows for high spectral efficiency gains but obviously comes at the cost of higher complexity, a fact that becomes all the more critical as the number of antennas grows large. To solve this issue is to choose a subset of the available n antennas. The subset must be carefully chosen to achieve the best performance. However, finding the optimal subset of antennas is usually a difficult task, requiring one to solve a high dimensional combinatorial optimization problem. In this paper, we approach this problem in two ways. The first one consists in solving a convex relaxation of the problem using standard convex optimization tools. The second technique solves the problem using a greedy approach. The main advantages of the greedy approach lies in its wider scope, in that, unlike the first approach, it can be applied irrespective of the considered performance criterion. As an outcome of this feature, we show that the greedy approach can be applied even when only the channel statistics are available at the BS, which provides blind way to perform antenna selection.

关键词： Massive MIMO antenna selection convex optimization greedy algorithm blind selection random matrix theory

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Tractable Stochastic Geometry Model for IoT Access in LTE Networks

Tractable Stochastic Geometry Model for IoT Access in LTE Ne...

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Global Communications Conference

作者： Mohammad Gharbieh Hesham ElSawy Ahmed Bader Mohamed-Slim Alouini Comput. Electr. & Math. Sci. & Eng. (CEMSE)Divison King Abdullah Univ. of Sci. & Technol. (KAUST) Thuwal Saudi Arabia

ISBN: (纸本)9781509013296

The Internet of Things (IoT) is large-scale by nature. This is not only manifested by the large number of connected devices, but also by the high volumes of traffic that must be accommodated. Cellular networks are indeed a natural candidate for the data tsunami the IoT is expected to generate in conjunction with legacy human-type traffic. However, the random access process for scheduling request represents a major bottleneck to support IoT via LTE cellular networks. Accordingly, this paper develops a math.matical framework to model and study the random access channel (RACH) scalability to accommodate IoT traffic. The developed model is based on stochastic geometry and discrete time Markov chains (DTMC) to account for different access strategies and possible sources of inter-cell and intra-cell interferences. To this end, the developed model is utilized to assess and compare three different access strategies, which incorporate a combination of transmission persistency, back-off, and power ramping. The analysis and the results showcased herewith clearly illustrate the vulnerability of the random access procedure as the IoT intensity grows. Finally, the paper offers insights into effective scenarios for each transmission strategy in terms of IoT intensity and RACH detection thresholds.

关键词： IoT LTE cellular networks Stochastic geometry Markov chains

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Power Control for D2D Underlay Cellular Networks with Imperfect CSI

Power Control for D2D Underlay Cellular Networks with Imperf...

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IEEE Globecom Workshops

作者： Amen Memmi Zouheir Rezki Mohamed-Slim Alouini Comput. Electr. & Math. Sci. & Eng. (CEMSE) Div. King Abdullah Univ. of Sci. & Technol. Thuwal Saudi Arabia

ISBN: (纸本)9781509024834

Device-to-Device communications underlying the cellular infrastructure is a technology that has recently been proposed as a promising solution to enhance cellular network capabilities. However, interference is the major challenge since the same resources are shared by both systems. Therefore, interference management techniques are required to keep the interference under control. In this work, in order to mitigate interference, we consider centralized and distributed power control algorithms in a one-cell random network model. Differently from previous works, we are assuming that the channel state information may be imperfect and include estimation errors. We evaluate how this uncertainty impacts performances. In the centralized approach, we derive the optimal powers that maximize the coverage probability and the rate of the cellular user while scheduling as many D2D links as possible. These powers are comput.d at the base station (BS) and then delivered to the users, and hence the name "centralized". For the distributed method, the on-off power control and the truncated channel inversion are proposed. Expressions of coverage probabilities are established in function of D2D links intensity, pathloss exponent and estimation error variance.

关键词： Device-to-device communications imperfect channel state information Poisson point process power control

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Software Quality Evaluation of the Laboratory Information System Used in the Santa Catarina State Integrated Telemedicine and Telehealth System

Software Quality Evaluation of the Laboratory Information Sy...

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Annual IEEE Symposium on comput.r-Based Medical Systems

作者： João M. Alves Alexandre Savaris Christiane G. Von Wangenheim Aldo Von Wangenheim Postgraduate Program in Computer Science UFSC Florianópolis Brazil Postgrad. Program in Comput. Sci. Fed. Univ. of Santa Catarina Florianopolis Brazil Postgrad. Program in Comput. Sci. Universidade Federal de Santa Catarina Florianopolis SC BR

A laboratory information system (LIS) manages information about patients, examinations, results, and quality control. In this context, software quality is important in order to prevent risks for the patient. Studies show that many LISs have a low quality degree, and although the ISO/IEC 25010 standard defines software quality in general, so far there is no specific customization for a quality evaluation model tailored for such systems. This paper presents a case study applying a customized evaluation model - the AdEQUATE model - in order to evaluate the software quality of a LIS widely used in the State of Santa Catarina, Brazil - the LACEN system - from the perspective of its end users. Analyzing the characteristics of the LACEN system, we customized the AdEQUATE model - a model for quality evaluation of telemedicine systems based on the ISO/IEC 25010 standard through the use of a questionnaire. The questionnaire has been answered by 69 users (including physicians and biochemists), and its answers were analyzed using descriptive statistics. In general, the quality of the LACEN system has been considered as good, specifically for characteristics like effectiveness, efficiency, satisfaction, freedom from risk, functional suitability, and security. On the other hand, few characteristics have been considered of low quality, including performance efficiency and compatibility. Also, the collected data shows that it is feasible to use AdEQUATE's systematically derived questionnaire for detailed observations of quality degrees of the ISO/IEC 25010 standard characteristics and subcharacteristics.

关键词： Telemedicine Software quality IEC Standards ISO Standards Information systems Medical services

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System integration for a biomimetic dynamic sonar head

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The Journal of the Acoustical Society of America 2018年第3_SUPPLEMENT期143卷 1727-1727页

作者： Dean Conte Lucas Mun Shubham Dawda Brandon Walker Joseph Sutlive Rolf Müller Mech. Eng. Virginia Tech 1075 Life Sci. Cir Blacksburg VA 24061 dconte97@vt.edu Elec. and Comput. Eng. Virginia Tech Blacksburg VA Translational Biology Medicine and Health Program Virginia Tech Roanoke VA Mech. Eng. Virginia Tech Blacksburg VA

Horseshoe bats (Rhinolophidae) have dynamic biosonar systems with interfaces for ultrasonic emission/reception that deform while diffracting the outgoing/incoming sound waves. This peripheral dynamics has been shown to enhance sensory information encoding. To investigate the properties and potential uses of these system features in the real world, a biomimetic sonar head is being developed with the goal of mimicking as much of the bats' peripheral dynamics as faithfully as possible. Further constraints on this development were suitability for integration with mobile platforms and support for interactive quantitative/in-depth experimentation. Flexible noseleaf and pinna shapes along with an actuation system have been designed to mimic the static geometry of the respective structures in bats as well as several of the animals' degrees of freedom in deforming them. The electrical subsystem has been designed to support high-quality ultrasound generation and recording. Generation of all source voltages and signal amplification have been consolidated into a single circuit board to reduce weight and complexity of the overall system. The frame has been altered to reduce weight and add modularity to the noseleaf and pinna elements. The software architecture is based on a back-end (Python, LabVIEW) combined with a flexible front-end (MATLAB) for experimental design and data analysis.

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