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Multi-view people detection on arbitrary ground in real-time

Multi-view people detection on arbitrary ground in real-time

引用

8th International Conference on computer Vision Theory and Applications, VISAPP 2013

作者： Kiss, Ákos Szirányi, Tamás Distributed Events Analysis Research Group Computer and Automation Research Institute Hungarian Academy of Sciences Budapest Hungary Dept. of Control Engineering and Information Technology Budapest University of Technology and Economics Budapest Hungary

ISBN: (纸本)9789898565471

We show a method to detect accurate 3D position of people from multiple views, regardless of the geometry of the ground. In our new method we search for intersections of 3D primitives (cones) to find positions of feet. The cones are computed by back-projecting ellipses covering feet in input images. Instead of computing complex intersection body, we use approximation to speed up intersection computing. We found that feet positions are determined accurately, and the height map of the ground can be reconstructed with small error. We compared our method to other multiview-detectors - using somewhat different test methodology -, and achieved comparable results, with the benefit of handling arbitrary ground. We also present accurately reconstructed height map of non-planar ground. Our algorithm is fast and most of steps are parallelizable, making it possibly available for smart camera systems.

关键词： computer vision

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Peer-assessment and grading of open answers in a web-based e-learning setting

Peer-assessment and grading of open answers in a web-based e...

引用

International Conference on Information Technology Based Higher Education and Training, ITHET

作者： Andrea Sterbini Marco Temperini Dept. of Computer Science Sapienza University of Roma Roma Italy Dept. of Computer Control and Management Engineering Sapienza University of Roma Roma Italy

Grading the answers given to open ended questions (and questionnaires) is a rather heavy task for teachers and lecturers. Several techniques have been used to automatically analyze the student's essays, but natural language processing is not yet ready to completely solve the task. We propose a solution, for the automated support to answers grading, where the students' peer assessment is checked against the teacher's marking, while such teacher's marking has to be performed on only a subset of the answers (so relieving the teacher by at least a part of the marking task). Our aim is twofold: 1) to make grading more effective by propagating the teacher's assessments through the network of peer assessments (so to maintain a progressively improved evaluations of the peer assessments precision and make them more likely to be used for final grading); 2) to suggest iteratively the teacher with the next most informative essays to grade (respect to the network, that is one of the answers whose teacher's mark will inject most information into the network and make the system better able to deduce the rest of the grades. To this aim we have used a very simple Bayesian model of peers and peer assessment, and we have built a web-based system to support the teacher. We show the present state of the model and its implementation. Moreover, we show, through a simulation protocol, how the system can support the teacher, obtaining a reasonably good correction with just a subset of the whole grades.

关键词： Bayes methods Electronic learning Knowledge engineering Probability distribution Proposals Data mining Probabilistic logic

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OpenAnswer, a framework to support teacher's management of open answers through peer assessment

OpenAnswer, a framework to support teacher's management of o...

引用

Frontiers in Education (FIE) Conference

作者： Andrea Sterbini Marco Temperini Dept. of Computer Science Sapienza University of Roma Roma Italy Dept. of Computer Control and Management Engineering Sapienza University of Roma Roma Italy

Open-ended questions are an important means to support analysis and assessment of students; they can be of extraordinary effectiveness for the assessment of higher cognitive levels of the Bloom's Taxonomy. On the other hand, assessing open answers (textual, freely shaped, answers to a question) is a hard task. In this paper we describe an approach to open answers evaluation based on the use of peer-assessment: in a social-collaborative e-learning setting implemented by the OpenAnswer web system, the students answer questions and rate others' (and may be own) answers, while the teacher marks a subset of the answers so to allow the system inferring the rest of the marks. The aim of our system is to ease the teacher's marking burden and allow for a more extensive use of open ended questionnaires in her/his teaching activity.

关键词： Bayes methods Probability distribution Computational modeling Educational institutions Data mining Taxonomy Electronic learning

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A case study on effectively identifying technical debt 13

A case study on effectively identifying technical debt

引用

17th International Conference on Evaluation and Assessment in Software engineering, EASE 2013

作者： Zazworka, Nico Spínola, Rodrigo O. Vetro, Antonio Shull, Forrest Seaman, Carolyn Fraunhofer USA Center for Experimental Software Engineering College Park United States Graduate Program in Systems and Computer UNIFACS Salvador Brazil Dept. of Control and Computer Engineering Politecnico di Torino Torino Italy Department of Information Systems UMBC Baltimore United States Elsevier Information Systems GmbH Frankfurt Germany

ISBN: (纸本)9781450318488

Context: The technical debt (TD) concept describes a tradeoff between short-term and long-term goals in software development. While it is highly useful as a metaphor, it has utility beyond the facilitation of discussion, to inspire a useful set of methods and tools that support the identification, measurement, monitoring, management, and payment of TD. Objective: This study focuses on the identification of TD. We evaluate human elicitation of TD and compare it to automated identification. Method: We asked a development team to identify TD items in artifacts from a software project on which they were working. We provided the participants with a TD template and a short questionnaire. In addition, we also collected the output of three tools to automatically identify TD and compared it to the results of human elicitation. Results: There is little overlap between the TD reported by different developers, so aggregation, rather than consensus, is an appropriate way to combine TD reported by multiple developers. The tools used are especially useful for identifying defect debt but cannot help in identifying many other types of debt, so involving humans in the identification process is necessary. Conclusion: We have conducted a case study that focuses on the practical identification of TD, one area that could be facilitated by tools and techniques. It contributes to the TD landscape, which depicts an understanding of relationships between different types of debt and how they are best discovered. Copyright 2013 ACM.

关键词： Software design

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Declarative Approach to AGVS Modeling and Cyclic Scheduling

Declarative Approach to AGVS Modeling and Cyclic Scheduling

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2013 4th International Conference on Information Technology for Manufacturing Systems(ITMS 2013)

作者： Bocewicz Grzegorz Muszyński Wojciech Banaszak Zbigniew Dept. of Electronics and Computer Science Koszalin University of Technology Institute of Computer Engineering Control and Robotics Wroclaw University of Technology Dept. of Business informatics Warsaw University of Technology

The paper presents constraint satisfaction problem driven approach to analytical solution of the cyclic scheduling problem in the Flexible Manufacturing System(FMS) producing multi-type parts where for material handling are used the Automated Guide Vehicles Systems(AGVS). Finding the conditions guaranteeing the AGVs deadlock-free and collision-free movement policy is the aim of our researches. The AGVs co-sharing the common parts of the transportation route while executing repetitive processes, i.e. being assigned to AGVs passing along machines in a cyclic way, can be modeled in terms of Cyclic Concurrent Process Systems(CCPS). Schedulability analysis for a given CCPS answers the question whether a cyclic schedule exists or not. The paper suggests approach for schedulability analysis of multimodal processes representing real manufacturing employing the declarative modeling.

关键词： Discrete event simulation DEVS Environmental science Decision support systems

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Development of parallel manipulator sit to stand assistive device for elderly people

Development of parallel manipulator sit to stand assistive d...

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2013 IEEE Workshop on Advanced Robotics and Its Social Impacts, ARSO 2013

作者： Salah, Omar Asker, Ahmed Fath El-Bab, Ahmed M. R. Assal, Samy M. F. Ramadan, Ahmed A. Sessa, Salvatore Abo-Ismail, Ahmed Egypt-Japan University of Science and Technology New Borg-El-Arab city Alexandria Egypt Mechanical Engineering Department Faculty of Engineering Assiut University Egypt Department of Production Engineering and Mechanical Design Faculty of Engineering Tanta University Alexandria Egypt Computer and Automatic Control Dept. Faculty of Engineering Tanta University Tanta Egypt Mechatronics and Robotics Dept. Egypt-Japan University of Science and Technology Egypt School of Creative Science and Engineering Waseda University Tokyo 168-8480 Japan

ISBN: (纸本)9781479923694

This paper describes a novel mobility assistive device under development in the Egypt-Japan University of Science and Technology (E-JUST). The proposed system can help patients who do not have enough physical strength on the lower limbs during sit to stand due to aging, diseases such as polymyositis and myopathy, and joint replacement surgery complications. It can follow the natural pattern of human motion during sit to stand providing assistance force under the shoulder. The overall device is compact and employees a parallel mechanism which provide more stiffness. Several experiments were carried out in a VICON room to calculate the human motion posture while sit to stand motion in addition estimate the trajectory of the end effector during assisting. computer simulation was built to verify the performance of the proposed system with the reference trajectory. © 2013 IEEE.

关键词： Mechanisms

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Investigating technical debt folklore: Shedding some light on technical debt opinion

Investigating technical debt folklore: Shedding some light o...

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2013 4th International Workshop on Managing Technical Debt, MTD 2013

作者： Spínola, Rodrigo O. Vetrò, Antonio Zazworka, Nico Seaman, Carolyn Shull, Forrest Graduate Program in Systems and Computer Universidade Salvador UNIFACS Salvador BA Brazil Dept. of Control and Computer Engineering Politecnico di Torino Torino Italy Elsevier Information Systems GmbH Frankfurt Germany Department of Information Systems UMBC Baltimore MD United States Fraunhofer USA Center for Experimental Software Engineering College Park United States

ISBN: (纸本)9781467364430

We identified and organized a number of statements about technical debt (TD Folklore list) expressed by practitioners in online websites, blogs and published papers. We chose 14 statements and we evaluated them through two surveys (37 practitioners answered the questionnaires), ranking them by agreement and consensus. The statements most agreed with show that TD is an important factor in software project management and not simply another term for 'bad code'. This study will help the research community in identifying folklore that can be translated into research questions to be investigated, thus targeting attempts to provide a scientific basis for TD management. © 2013 IEEE.

关键词： Surveys

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Classification of Language Interactions

Classification of Language Interactions

引用

International Symposium on Empirical Software engineering and Measurement, ESEM

作者： Federico Tomassetti Marco Torchiano Antonio Vetro Dept. of Control and Computer Engineering Politecnico di Torino Torino Italy Politecnico di Torino Torino Piemonte IT

Context: the presence of several languages interacting each other within the same project is an almost universal feature in software development. Earlier work shows that this interaction might be source of problems. Objective: we aim at identifying and characterizing the cross-language interactions at semantic level. Method: we took the commits of an open source project and analyzed the cross-language pairs of files occurring in the same commit to identify possible semantic interactions. We both defined a taxonomy and applied it. Result: we identified 6 categories of semantic interactions. The most common category is the one based on shared ids, the next is when an artifact provides a description of another artifact. Conclusion: the deeper knowledge of cross-language interactions represents the basis for implementing a tool supporting the management of this kind of interactions and the detection of related problems at compile time.

关键词： Semantics Java Software Loading XML Taxonomy Couplings

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Analysis of open answers via mediated peer-assessment

Analysis of open answers via mediated peer-assessment

引用

International Conference on System Theory, control, and Computing (ICSTCC)

作者： Andrea Sterbini Marco Temperini Department of Computer Science Sapienza University of Rome Rome Italy Dept. of Computer Control and Management Engineering Sapienza University of Rome Rome Italy

The analysis and grading of open answers (i.e. answers to open-ended questions) is a powerful means to model the state of knowledge and cognitive level of students in e-learning systems. In a previous work (presented at last SPEL workshop) we showed an approach to open answers grading, based on Constraint Logic Programming (CLP) and peer assessment, where students were defined as triples of finite-domain variables: K for student's Knowledge about the question's topic, C for Correctness of her/his answer, and J for her/his estimated ability to evaluate (“Judge”) another peer's answer. The CLP Prolog module supported the grading process helping eventually to get a complete set of grades although the teacher had actually graded only a (substantial indeed) part of them. Here we try and tackle the problem of grading open answers by an alternative approach, using peer-assessment in a social collaborative e-learning setting, mediated by the teacher through a simple Bayesian-networks-based model, that allows managing student models (based on the same finite-domain variables as above) and producing again automated evaluations of those answers that have not been graded by the teacher. In particular we give an account of the OpenAnswer web-based system, which can allow teachers and students to use our approach, and show the result of some experimentation we conducted.

关键词： Computational modeling Bayes methods Probability distribution computer science Electronic learning Semantics Ontologies

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Robust Distributed control Design for Interconnected Systems under Topology Uncertainty

Robust Distributed Control Design for Interconnected Systems...

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American control Conference

作者： Dong Xue Azwirman Gusrialdi Sandra Hirche Institute for Information-oriented Control Technische Universitat Munchen Dept. Electrical Engineering and Computer Science University of Central Florida

ISBN: (纸本)9781479901777

This paper jointly designs the distributed control law and its communication architecture for large-scale interconnected systems. The novelty is to consider both, the robustness guaranty under topology uncertainty and the performance improvement of the overall system. The proposed framework consists of two steps. The first step aims at finding a set of stabilizing distributed control laws providing H_∞ robust performance under topology uncertainty. In the second step the performance of the interconnected system is further improved by searching for the optimal communication topology within acquired set of distributed control laws. In this step, the design of communication architecture is achieved by minimizing the H_2 norm. Additionally, a trade-off between performance improvement and communication cost is incorporated. Furthermore, to reduce computational complexity, a strategy to manipulate the existing communication links is proposed to deal with topology variation in the interconnected systems. Finally, the developed method is demonstrated via some examples.

关键词： large-scale systems control law performance boost decentralised control topology design control Telecommunication links Communication Research

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