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arXiv 2018年

作者： Beaupré, David-Alexandre Bilodeau, Guillaume-Alexandre Saunier, Nicolas LITIV Lab. Dept. of Computer and Software Eng. Polytechnique Montréal Montréal Canada Dept. of Civil Geo and Mining Eng. Polytechnique Montréal Montréal Canada

In this paper, we present a new method for detecting road users in an urban environment which leads to an improvement in multiple object tracking. Our method takes as an input a foreground image and improves the object detection and segmentation. This new image can be used as an input to trackers that use foreground blobs from background subtraction. The first step is to create foreground images for all the frames in an urban video. Then, starting from the original blobs of the foreground image, we merge the blobs that are close to one another and that have similar optical flow. The next step is extracting the edges of the different objects to detect multiple objects that might be very close (and be merged in the same blob) and to adjust the size of the original blobs. At the same time, we use the optical flow to detect occlusion of objects that are moving in opposite directions. Finally, we make a decision on which information we keep in order to construct a new foreground image with blobs that can be used for tracking. The system is validated on four videos of an urban traffic dataset. Our method improves the recall and precision metrics for the object detection task compared to the vanilla background subtraction method and improves the CLEAR MOT metrics in the tracking tasks for most videos. Copyright © 2018, The Authors. All rights reserved.

关键词： Object detection

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An Effective Enhancement and Segmentation of Coronary Arteries in 2D Angiograms

An Effective Enhancement and Segmentation of Coronary Arteri...

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International Conference on Smart Computing and Electronic Enterprise (ICSCEE)

作者： Sammer Zai Asad Abbas Mehran University of Engineering and Technology Dept. of Computer Systems Engineering Jamshoro Pakistan Dept. of Software Engineering Hanyang University Ansan South Korea

ISBN: (纸本)9781538648391

Vessel enhancement in two-dimensional angiogram images is an essential pre-requisite step towards the isolation of coronary arteries. Hessian-based filters are the most commonly used vessel enhancement filters; however, these filters are more sensitive to noise and suppress the bifurcation regions. Suppression of bifurcation regions results in disconnected vessels. In this study, we present a technique that enhances the arteries of the heart in 2D angiograms and also refines the noisy vesselness obtained through Frangi's method by using guided filter which produces more enhanced image that can be used as an effective pre-processing step for binarization of the Frangi vessel response having less discontinuities and joint suppression. The proposed approach makes use of the guided filter which smooths the edges, and at the same time preserves the edges as well for the enhancement of vessels. Following this filter, an Adaptive thresholding is applied to segment the coronary arteries from the angiogram. The proposed method has been tested on real angiography images and the efficiency of the method has been shown qualitatively as well as quantitatively.

关键词： Arteries Image segmentation Maximum likelihood detection Nonlinear filters Two dimensional displays Filtering algorithms Bifurcation

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A Highly Integrated Computing Platform for Continuous, Non-Invasive BP Estimation

A Highly Integrated Computing Platform for Continuous, Non-I...

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IEEE Canadian Conference on Electrical and computer engineering

作者： Nazrul Khan J. Mikael Eklund Dept. of Electrical Computer and Software Engineering University of Ontario Institute of Technology Oshawa Canada

ISBN: (纸本)9781538624111

Bio-Signal computing involves signal acquisition, conditioning and processing. Inherently, signal acquisition and conditioning is done through analog discrete front end circuitry. Signal processing in the analog domain involves higher component counts, inaccuracies, and limitations. Due to the recent developments in VLSI technology, highly integrated Analog Front Ends (AFEs) are emerging, capable of processing bio-signals under program control. This ushers a new design paradigm for the embedded system designers. In this paper, we present a highly integrated AFE based embedded system-a novel, low cost remote platform, capable of multimodal bio-signal computing including continuous, and non-invasive blood pressure estimation.

关键词： Health monitor Analog Front End (AFE) Electrocardiography (ECG) Plethysmography (PPG) Pulse Transit Time (PTT) Serial Peripheral Interface (SPI) SBP (Systolic Blood Pressure) DBP (Diastolic Blood Pressure)

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Optimal Cache Placement for Modified Coded Caching with Arbitrary Cache Size

arXiv

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arXiv 2018年

作者： Deng, Yong Dong, Min Dept. of Electrical Computer and Software Engineering University of Ontario Institute of Technology Ontario Canada

We consider content caching between a service provider and multiple cache-enabled users, using the recently proposed modified coded caching scheme (MCCS) that provides an improved delivery strategy for random user requests. We develop the optimal cache placement solution for the MCCS with arbitrary cache size by formulating the cache placement as an optimization problem to minimize the average rate during the delivery phase under random user requests. Through reformulation, we show that the problem is a linear programming problem. By exploring the properties in the caching constraints, we obtain the optimal cache placement solution in closed-form. We verify that the existing cache placement scheme obtained at specific cache sizes is a special case of our solution. Numerical studies show how the caching gain changes as the user population increases, as a result of different cache placement patterns. Copyright © 2018, The Authors. All rights reserved.

关键词： Linear programming

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Heptagonal Photonic Crystal Fiber Based Chemical Sensor in THz Regime

Heptagonal Photonic Crystal Fiber Based Chemical Sensor in T...

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International Conference on Informatics, Electronics & Vision (ICIEV)

作者： Md. Mahamudul Hasan Shuvo Sen Md. Juwel Rana Bikash Kumar Paul Md. Ahsan Habib Golam Moktader Daiyan Kawsar Ahmed Dept. of Physics Mawlana Bhashani Science and Technology University Tangail Bangladesh Dept. of ICT Mawlana Bhashani Science and Technology University Tangail Bangladesh Dept. of Software Engineering (SWE) Daffodil International University Dhaka Bangladesh School of Computer Science and Technology University of Electronic Science and Technology Sichuan Province China Group of Bio-photomatiχ Mawlana Bhashani Science and Technology University Tangail Bangladesh

In this article, here is developed a novel TOPAS based heptagonal photonic crystal fiber (H-PCF) for the identification of various chemical substances in the terahertz frequency territory. The full-vector finite element method (FV-FEM) is used for the numerical investigation about the competence of the proposed PCF. Simulation results show the maximum relative sensitivity as well as less connement loss for various chemicals. Numerically processed outcomes apparent that the proposed sensor shows 63.24 %, 61.05 % and 60.03 % detecting reactions for focused analytes benzene, ethanol and water individually at 1 THz frequency. Major purposes is to use H-PCF as the application of chemical sensor in commercial sector to detect harmful chemicals.

关键词： Sensitivity Ethanol Sensors Chemicals Terahertz radiation Optical losses Photonic crystals

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Low-Complexity Weighted Mrt Multicast Beamforming in Massive Mimo Cellular Networks

Low-Complexity Weighted Mrt Multicast Beamforming in Massive...

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IEEE International Conference on Acoustics, Speech and Signal Processing

作者： Jiawei Yu Min Dong Dept. of Electrical Computer and Software Engineering University of Ontario Institute of Technology Ontario Canada

ISBN: (纸本)9781538646595

We consider downlink multicast beamforming in a massive MIMO multi-cell network. Aiming at maximizing the minimum SINR among users, for both non-cooperative and cooperative multicasting, we propose a multicast beamforming scheme based on weighted maximum ratio transmission (MRT), and transform the beamforming optimization problem into a weight optimization problem that is solved via the semi-definite relaxation (SDR) approach. The proposed method has a low computational complexity which does not grow with the number of antennas, and thus is suitable for massive MIMO systems. Simulation shows that our proposed multicast beamforming solution yields comparable or better performance than existing approaches but with significantly lower complexity for practical systems with a large but finite number of antennas.

关键词： Multicast beamforming massive MIMO multicell coordination base station cooperation

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Directional Motion-based Interfaces for Virtual and Augmented Reality Head-mounted Displays

Directional Motion-based Interfaces for Virtual and Augmente...

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International computers, Signals and Systems Conference (ICOMSSC)

作者： Wenge Xu Haining Liang Yong Yue Dept. of Computer Science and Software Engineering Xi’an Jiaotong Liverpool University Suzhou China

ISBN: (纸本)9781538667521

This research, conducts an experiment to investigate whether there is a difference in user performance and preference for two types of head-mounted displays (HMDs) when users need to perform directional motion movements such as moving one foot forward and backward (or leftward or rightward). The two types of HMDs we have considered are virtual reality (VR) and augmented reality (AR), which represent the two most commonly marketed HMDs. The AR device chosen for this research is the Meta 2 while the chosen VR device is the Oculus RIFT CV1. The results of our experiment show that there is a close significant difference on task completion time between AR and VR condition when users perform motion direction tasks. Also, no significant effect has been found on the accuracy of making these motion movements between the AR and VR conditions. In terms of user preference, the results show that there is no significant effect on workload, motion sickness, immersion, and user experience. These results suggest that both AR and VR HMDs are suitable for interfaces that can rely on body motions like tapping on the floor using one foot in any of the directions around the user.

关键词： Task analysis Analysis of variance User experience Performance evaluation Atmospheric measurements Particle measurements Time measurement

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On the Effect of Object Redundancy Elimination in Randomly Testing Collection Classes

On the Effect of Object Redundancy Elimination in Randomly T...

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IEEE/ACM International Workshop on Search-Based software Testing (SBST)

作者： Pablo Ponzio Valeria Bengolea Simón Gutiérrez Brida Gastón Scilingo Nazareno Aguirre Marcelo Frias Dept. of Computer Science University of Rio Cuarto Argentina Dept. of Software Engineering Buenos Aires Institute of Technology Argentina

In this paper, we analyze the effect of reducing object redundancy in random testing, by comparing the Randoop random testing tool with a version of the tool that disregards tests that only produce objects that have been previously generated by other tests. As a side effect, this variant also identifies methods in the software under test that never participate in state changes, and uses these more heavily when building assertions. Our evaluation of this strategy concentrates on collection classes, since in this context of object-oriented implementations that de- scribe stateful objects obbeying complex invariants, object variabil- ity is highly relevant. Our experimental comparison takes the main data structures in ***, and shows that our object redun- dancy reduction strategy has an important impact in testing collec- tions, measured in terms of code coverage and mutation killing.

关键词： Redundancy software Test pattern generators Dictionaries Tools Standards

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On the UML use in the brazilian industry: A state of the practice survey 30

On the UML use in the brazilian industry: A state of the pra...

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30th International Conference on software engineering and Knowledge engineering, SEKE 2018

作者： Farias, Kleinner Gonçales, Lucian Bischoff, Vinicius Da Silval, Bruno Guimarães, Everton Nogle, Jacob Univ. of Vale Do Rio Dos Sinos São Leopoldo Brazil Dept. of Computer Science and Software Engineering California Polytechnic State University San Luis Obispo United States Department of Computer Science Drexel University Philadelphia United States

ISBN: (纸本)1891706446

Context: The Unified Modeling Language (UML) has become the standard for modeling software. Several surveys on the UML usage have been proposed in recent years. However, none of them explores the UML use in specific regional scope, and thus little is known about the practices and perceptions of UML use from the perspective of practitioners in the Brazilian industry. Objective: This paper reports on a survey focused on identifying the state-of-The-practice of the Brazilian industry for what concerns the UML usage in real-world settings. Method: In total, 222 practitioners from 140 different Information Technology companies have answered an on-line (or printed) questionnaire concerning their UML use experiences, the difficulty in adopting UML and what should be done to increase the UML adoption in practice. Result: The results show that: (1) 60 participants (28.2%) have used UML in their daily work, while 73.2% have not;(2) 55.41% of the surveyed participants did not disagree with the statement that UML is the "lingua franca" in software modeling;(3) 61.26% reported to find that the automatic creation of UML diagrams to represent a big picture of the system under development would be useful to boost UML use. Conclusion: The UML is not often used in the work life of participants. In addition, no relationship was identified between the use of UML and the participant company being a software factory. © 2018 Universitat zu Koln. All rights reserved.

关键词： Unified Modeling Language

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From Operational to Declarative Specifications Using a Genetic Algorithm

From Operational to Declarative Specifications Using a Genet...

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IEEE/ACM International Workshop on Search-Based software Testing (SBST)

作者： Facundo Molina Renzo Degiovanni Germán Regis Pablo Castro Nazareno Aguirre Marcelo Frias Dept. of Computer Science University of Rio Cuarto Argentina Dept. of Software Engineering Buenos Aires Institute of Technology Argentina

In specification-based test generation, sometimes having a formal specification is not sufficient, since the specification may be in a different formalism from that required by the generation approach being used. In this paper, we deal with this problem specifically in the context in which, while having a formal specification in the form of an operational invariant written in a sequential programming language, one needs, for test generation, a declarative invariant in a logical formalism. We propose a genetic algorithm that given a catalog of common properties of invariants, such as acyclicity, sortedness and balance, attempts to evolve a conjunction of these that most accurately approximates an original operational specification. We present some details of the algorithm, and an experimental evaluation based on a benchmark of data structures, for which we evolve declarative logical invariants from operational ones.

关键词： Tools Biological cells Genetic algorithms Test pattern generators computer science Metals Data structures

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