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8th International Conference on Universal Access in Human-computer Interaction, UAHCI 2014 - Held as Part of 16th International Conference on Human-computer Interaction, HCI International 2014

作者： De Marsico, Maria Sterbini, Andrea Temperini, Marco Dept. of Computer Science Sapienza University of Rome Italy Dept. of Computer Control and Management Engineering Sapienza University of Rome Italy

ISBN: (纸本)9783319074399

In this paper we build on previous work exploring a formal way to assess the composition of learning groups. We start from our existing framework, designed to provide support to personalization in e-learning environments, comprising an implementation of the Vygotskij Theory of proximal development. In such theory, effective individual learning achievements can be only obtained within the boundaries of a cognitive zone where the learner can proceed without frustration, though with support from teacher and peers. In this endeavor, the individual development cannot disregard social-collaborative educational activities. Previously we gave operative definitions of the Zone of Proximal Development for both single learners and groups;here we aim at assessing the viability of a partition of students in groups over a common task. © 2014 Springer International Publishing.

关键词： computer aided instruction

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A SCORM based package model for WebLabs 44

A SCORM based package model for WebLabs

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44th Annual Frontiers in Education Conference, FIE 2014

作者： Ruano-Ruano, Ildefonso Gámez-García, Javier Bencomo, Sebastián Dormido Ortega, Juan Gómez GRAV Group University of Jaén Jaén Spain Dept. of Computer Science and Automatic Control UNED Madrid Spain

ISBN: (纸本)9781479939213

Web Laboratories (WebLabs) are essential resources for engineering education. Within this type of laboratory, a new Sharable Content Object Reference Model (SCORM) package design model is shown in this work. The proposed model is based on a set of resources that form a complete educational structure;taking into account the sequencing and navigation among the elements that compose it. In addition, it can be uploaded to a Learning Management System (LMS), offering to the students an effective tool to work with web labs. The package is structured in 4 sections or pages: Introduction, Theory, Virtual/Remote Laboratory (VRL) and Assessment;where the last performs an automated verification of the work done by the learner. In this way, one of the advantage of this methodology is that the instant results of the assessments, performed by the SCORM package, is stored in the inner LMS. Some WebLabs performing this methodology are being developed in the University of Jaén. In this work, an example is developed: 'Modelling of Dynamic System: DC Motor'. This WebLab is used in the Industrial Automation course that is included in several Industrial engineering degrees. © 2014 IEEE.

关键词： Laboratories

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A landmark based localization system using a kinect sensor

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Transactions of the Korean Institute of Electrical Engineers 2014年第1期63卷 99-107页

作者： Park, Kwiwoo Chae, JeongGeun Moon, Sang-Ho Park, Chansik Dept. of Control and Robot Engineering Chungbuk National University Korea Republic of Division of Computer Technology Yeungnam College of Scienceand Technology Korea Republic of

In this paper, a landmark based localization system using a Kinect sensor is proposed and evaluated with the implemented system for precise and autonomous navigation of low cost robots. The proposed localization method finds the positions of landmark on the image plane and the dept. value using color and dept. images. The coordinates transforms are defined using the dept. value. Using coordinate transformation, the position in the image plane is transformed to the position in the body frame. The ranges between the landmarks and the Kinect sensor are the norm of the landmark positions in body frame. The Kinect sensor position is computed using the tri-lateral whose inputs are the ranges and the known landmark positions. In addition, a new matching method using the pin hole model is proposed to reduce the mismatch between dept. and color images. Furthermore, a height error compensation method using the relationship between the body frame and real world coordinates is proposed to reduce the effect of wrong leveling. The error analysis are also given to find out the effect of focal length, principal point and dept. value to the range. The experiments using 2D bar code with the implemented system show that the position with less than 3cm error is obtained in enclosed space(3,500mm *3,000mm*2,500m).

关键词： Error compensation

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Development of an innovative method to predict and to characterize the performances of Ti-6Al-4V LBW joints

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AIP Conference Proceedings 2016年第1期1769卷

作者： Mariacira Liberini Sara Esposito Kambitz Reshad Barbara Previtali Marco Viola Antonino Squillace 1University of Naples “Federico II” Dept. of Chemical Materials and Industrial Production Engineering P.le Tecchio 80 80125 Naples Italy 2Polytechnic of Milan Mechanical Engineering Department via La Masa 1 20156 Milano Italy 3Sapienza University of Rome Dept. of Computer Control and Management Engineering Via Ariosto 25 00185 Rome Italy.

Every manufacturing process leaves on the surface of the piece a typical “technology signature”. In particular, the laser welding leaves a feature at the edge of the weld bead called “undercut”. In this work an experimental campaign has been conducted on Ti6Al4V butt joints. In particular a Central Composite Design (CCD) with the central point repeated three times has been investigated. In the CCD there are two factors (power and speed of the fiber laser) and five levels for each factor. This paper deals with the investigation about the correlation between the severity of the undercut and the process parameters of the laser welding. In particular, through the confocal microscopy, the original geometry of the joint was accurately acquired and rebuilt in order to make a FEM model and simulate the mechanical behavior using Ansys14.5. Moreover, response surfaces and level curves were carried out to understand and predict the dept. and the width of the undercut starting from the power and the speed of the laser. At last a mathematic and geometry regression was performed in order to find a unique conical curve that interpolates all the different undercuts and that varies its parameters according to the process parameters. It is established that the process with higher speed minimizes and optimizes the undercut in the joints.

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Magnetic saturation of permanent magnet motor coil as key effect for initial rotor position detection

Magnetic saturation of permanent magnet motor coil as key ef...

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IEEE International Conference on Consumer Electronics - Berlin (ICCE-Berlin)

作者： Nebojsa Pjevalica Milos Nikolic Nikola Teslic Computing and control engineering dept. University of Novi Sad Novi Sad Serbia RT-RK Computer based systems Novi Sad Serbia University of Novi Sad Novi Sad Serbia

Permanent magnet (PM) motors, due to it's simplicity, reliability and overall efficiency are currently taking "most wanted" epithet in the number of consumer appliances. In recent two decades a lot of scientific papers were published regarding sensor-less control of permanent magnet DC motors. One of the most critical challenges is start from the stand still, with or without load, due to absence of back electromotive force in the motor coils. Core magnetic effect which enables detection of position, when motor is still, is based on magnetic saturation. Aim of this paper is to give magnetic explanation of this phenomena, which is generally neglected in most of motor control related textbooks and papers as well, also most of the motor models are based on linear magnetic approximation of the coils, hiding this key effect which provides information about initial position.

关键词： Conferences Consumer electronics

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Analog circuitry for BLDC motor magnetic saturation diagnostic

Analog circuitry for BLDC motor magnetic saturation diagnost...

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IEEE International Symposium on Design and Diagnostics of Electronic Circuits & Systems

作者： Nebojsa Pjevalica Milos Nikolic Ivan Kastelan Computing and control engineering dept. Univerity of Novi Sad Novi Sad Serbia RT - RK Computer based systems Novi Sad Serbia Univerity of Novi Sad Novi Sad Serbia

A novel method for diagnostic of the BLDC motor magnetic saturation is proposed. It comprises of analog amplifier in the role of pure sinusoidal current source, measurement subsystem and proposed acquisition which reliably detects signal asymmetry which is directly correlated with coil saturation. Practical experimental results are presented as proof of concept with several different current excitation levels.

关键词： Saturation magnetization Permanent magnets Magnetic flux Permanent magnet motors Harmonic analysis Rotors Voltage measurement

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Efficient detection of viral transmission with threshold-based methods

Efficient detection of viral transmission with threshold-bas...

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IEEE International Conference on Computational Advances in Bio and Medical Sciences (ICCABS)

作者： Inna Rytsareva David S. Campo Yueli Zheng Seth Sims Cansu Tetik Jain Chirag Sriram P. Chockalingam Sharma V. Thankachan Amanda Sue Srinivas Aluru Yury Khudyakov Division of Viral hepatitis Centers for Disease Control and Prevention Atlanta USA Eagle Medical Services Centers for Disease Control and Prevention Atlanta USA School of Computational Science and Engineering Georgia Institute of Technology Atlanta USA Dept. of Computer Science and Engineering IIT Bombay Mumbai India

Hepatitis C is a major public health problem in the United States and worldwide. Outbreaks of hepatitis C virus (HCV) infections associated with unsafe injection practices, drug diversion, and other exposures to blood are difficult to detect and investigate. Molecular analysis has been frequently used in the study of HCV outbreaks and transmission chains; helping identify a cluster of sequences as linked by transmission if their genetic distances are below a previously defined threshold. However, HCV exists as a population of numerous variants in each infected individual and it has been observed that minority variants in the source are often the ones responsible for transmission, a situation that precludes the use of a single sequence per individual because many such transmissions would be missed. The use of Next-Generation Sequencing immensely increases the sensitivity of transmission detection but brings a considerable computational challenge because all sequences need to be compared among all pairs of samples. For instance, our relatively small dataset of 401 samples, a total of 80200 pairwise sample comparisons must be performed, which account for 4.56 x 1010 pairwise sequence comparisons. We present a fast and efficient three-step filtering strategy that removes 85.1% of all the pairwise sample comparisons and 91.0% of all pairwise sequence comparisons, accurately establishing which pairs of HCV samples are below the relatedness threshold This electronic document is a “live” template and already defines the components of your paper [title, text, heads, etc.] in its style sheet.

关键词： Bioinformatics Diseases Filtering Genetics Scientific computing Drugs Sequential analysis

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Second-order particle MCMC for Bayesian parameter inference 19

Second-order particle MCMC for Bayesian parameter inference

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19th IFAC World Congress on International Federation of automatic control, IFAC 2014

作者： Dahlin, Johan Lindsten, Fredrik Schön, Thomas B. Division of Automatic Control Linköping University Sweden Dept. of Engineering University of Cambridge United Kingdom Division of Systems and Control Uppsala University Sweden

ISBN: (纸本)9783902823625

We propose an improved proposal distribution in the Particle Metropolis-Hastings (PMH) algorithm for Bayesian parameter inference in nonlinear state space models. This proposal incorporates second-order information about the parameter posterior distribution, which can be extracted from the particle filter already used within the PMH algorithm. The added information makes the proposal scale-invariant, simpler to tune and can possibly also shorten the burn-in phase. The proposed algorithm has a computational cost which is proportional to the number of particles, i.e. the same as the original marginal PMH algorithm. Finally, we provide two numerical examples that illustrates some of the possible benefits of adding the second-order information. © IFAC.

关键词： Inference engines

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Mobile App for Stress Monitoring using Voice Features

Mobile App for Stress Monitoring using Voice Features

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E-Health and Bioengineering Conference

作者： Virginia Sandulescu Sally Andrews David Ellis Radu Dobrescu Oscar Martinez-Mozos Dept. of Automatic Control and Industrial Informatics Politehnica University of Bucharest Bucharest Romania Affiliation School of Social Sciences Nottingham Trent University Nottingham UK Affiliation Department of Psychology Lancaster University Lancaster UK Affiliation School of Computer Science University of Lincoln Lincoln UK

ISBN: (纸本)9781467375467

The paper describes the steps involved in designing and implementing a mobile app for real time monitoring of mental stress using voice features and machine learning techniques. The app is easy to use and completely non-invasive. It is called StressID and it is available in the Google Play store. With the use of a server application presenting a web interface, interested parties may remotely monitor the stress states detected by the mobile app, enlarging the number of use case scenarios.

关键词： stress SVM voice features mobile app

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Lighting control and monitoring for energy efficiency: A case study focused on the interoperability of building management systems

Lighting control and monitoring for energy efficiency: A cas...

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International Conference on Environment and Electrical engineering (EEEIC)

作者： Anna Pellegrino Valerio R.M. Lo Verso Laura Blaso Andrea Acquaviva Edoardo Patti Anna Osello Department of Energy - TEBE Research Group Politecnico di Torino Turin Italy Department of Control and Computer Engineering Politecnico di Torino Turin Italy Dept. of Structural Geotechnical and Building Engineering Politecnico di Torino Turin Italy

ISBN: (纸本)9781479979943

The paper presents some results of a project carried out within the 7 th European Research Framework Program, aimed at developing an event-driven user-centric middleware for monitoring and managing energy consumption in public buildings. One of the strengths of the designed system is to allow an easy integration of heterogeneous technologies and their hardware independent interoperability. This is a feature of great importance to existing buildings, where standing controls could be integrated with new technologies to enhance a greater building energy efficiency. The functionality of the system has been tested in some representative spaces of existing public buildings. control strategies and hardware infrastructures have been defined to manage the operation of HVAC and lighting plants. The paper focuses on the results obtained by applying the designed system and control strategies to the electric lighting plants of different office spaces.

关键词： Buildings Middleware Sensors Energy consumption Lighting control systems Noise

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