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Importance sampling for general hybrid Bayesian networks

Importance sampling for general hybrid Bayesian networks

引用

11th International Conference on Artificial Intelligence and Statistics, AISTATS 2007

作者： Yuan, Changhe Druzdzel, Marek J. Department of Computer Science and Engineering Mississippi State University Mississippi State MS 39762 United States Decision Systems Laboratory School of Information Sciences and Intelligent Systems Program University of Pittsburgh Pittsburgh PA 15260 United States

Some real problems are more naturally modeled by hybrid Bayesian networks that consist of mixtures of continuous and discrete variables with their interactions described by equations and continuous probability distributions. However, inference in such general hybrid models is hard. Therefore, existing approaches either only deal with special instances, such as Conditional Linear Gaussians (CLGs), or approximate a general model with a restricted version and then perform inference on the simpler model. However, results thus obtained highly depend on the quality of the approximations. This paper describes an importance sampling-based algorithm that directly deals with hybrid Bayesian networks constructed in the most general settings and guarantees to converge to the correct answers given enough time.

关键词： Importance sampling

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Implementing and Improving a method for non-invasive elicitation of probabilities for bayesian networks 07

Implementing and Improving a method for non-invasive elicita...

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International Conference on computer systems and Technologies and Workshop for PhD Students in Computing, CompSysTech '07

作者： De Jongh, Martinus Druzdzel, Marek Rothkrantz, Leon Faculty of Electrical Engineering Mathematics and Computer Science Man-Machine Interaction Group Delft University of Technology Delft Netherlands Decision Systems Laboratory School of Information Sciences and Intelligent Systems Program University of Pittsburgh Pittsburgh PA United States

ISBN: (纸本)9789549641509

Knowledge elicitation is difficult for expert systems that are based on probability theory. The elicitation of probabilities for a probabilistic model requires a lot of time and interaction between the knowledge engineer and the expert. Druzdzel and van der Gaag [5] have proposed a theoretical framework that would allow the use of multiple types of probabilistic information for elicitation of Bayesian networks. This framework has been used as a starting point for the implementation of a non-invasive elication method. © 2007 ACM.

关键词： Linear programming

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The Women in science and engineering (WiSE) program at the University of Southern California: Achievements and challenges of the first five years

The Women in Science and Engineering (WiSE) program at the U...

引用

114th Annual ASEE Conference and Exposition, 2007

作者： Hawkes, Nicole Morrison, Jean Raghavendra, Cauligi WiSE University of Southern California United States University of Southern California United States Program University of Southern California United States Department of Earth Sciences Program USC Viterbi School of Engineering United States Departments of Electrical Engineering-Systems and Computer Science University of Southern California United States

The establishment of the Women in science and engineering (WiSE) program represents the serious commitment of the University of Southern California to address the under-representation of women in science and engineering. Since the launch of the program in 2000, WiSE has helped to more than double the number of tenured and tenure-track women faculty at USC from 15 to 35, through its recruitment and retention programs. Its complimentary programs to support undergraduates, graduate students, and postdoctoral scholars through a range of financial awards and activities have also grown in scope and impact. This paper describes the programs developed and administered by WiSE, the perceived successes to date, the challenges that remain, and the future directions of the program to ensure continued progress toward gender equity in science and engineering at USC. Through an analysis of the WiSE program at USC, we hope to present a model from which others can draw on to tackle the same issues at their own institutions. © American Society for engineering Education, 2007.

关键词： engineering education

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Real-time recognition of traffic signs using opponent color filters

Real-time recognition of traffic signs using opponent color ...

引用

14th World Congress on Intelligent Transport systems, ITS 2007

作者： Baba, Kyoko Hirai, Yuzo Master's Program in Graduate School of Systems and Information Engineering University of Tsukuba 1-1-1 Ten-nodai Tsukuba Ibaraki 305-8573 Japan Department of Computer Science Graduate School of Systems and Information Engineering University of Tsukuba 1-1-1 Ten-nodai Tsukuba Ibaraki 305-8573 Japan

ISBN: (纸本)9781617387777

In order to assist driver's vision, a real-time recognition system for traffic signs is proposed. After detecting sign candidates, biologically inspired opponent-color filters are used to extract symbol parts of signs. After normalizing the size of symbol, structural features are calculated to identify the sign. 5572 segmented images are used to design the algorithm. In a real-time system, the same sign in a sequence of frames is tracked, and a majority vote is used to integrate the recognition results. For test data, 93.8% recall rate and 99.3% precision rate could be attained. In-vehicle experiment also showed high recall and precision rates.

关键词： Traffic signs

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Logic as energy: A SAT-based approach

Logic as energy: A SAT-based approach

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2nd International Symposium on Brain, Vision, and Artificial Intelligence, BVAI 2007

作者： Lima, Priscila M. V. Morveli-Espinoza, M. Mariela M. França, Felipe M. G. LAM - Computer Architecture and Microelectronics Laboratory Universidade Federal Do Rio de Janeiro Brazil Departament d'Informàtica Universitat Autònoma de Barcelona Spain COPPE - Systems Engineering and Computer Science Program Universidade Federal Do Rio de Janeiro Brazil

ISBN: (纸本)3540755543

This paper presents the implementation of ARQ-PROP II, a limited-depth propositional reasoner, via the compilation of its specification into an exact formulation using the satyrus platform. satyrus' compiler takes as input the definition of a problem as a set of pseudo-Boolean constraints and produces, as output, the Energy function of a higher-order artificial neural network. This way, satisfiability of a formula can be associated to global optima. In the case of ARQ-PROP II, global optima is associated to Resolution-based refutation, in such a way that allows for simplified abduction and prediction to be unified with deduction. Besides experimental results on deduction with ARQ-PROP II, this work also corrects the mapping of satisfiability into Energy minima originally proposed by Gadi Pinkas. © 2007 Springer-Verlag Berlin Heidelberg.

关键词： Neural networks

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Architectural elements recovery and quality evaluation to assist in reference architectures specification

Architectural elements recovery and quality evaluation to as...

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19th International Conference on Software engineering and Knowledge engineering, SEKE 2007

作者： De Vasconcelos, Aline Pires Vieira Werner, Claudia Maria Lima COPPE UFRJ Systems Engineering and Computer Science Program P.O. Box 68511 Rio de Janeiro RJ Brazil CEFET Campos Federal Center for Technological Education of Campos Dr. Siqueira 273 Campos dos Goytacazes RJ Brazil

ISBN: (纸本)9781627486613

Reference architectures are the basis for application instantiation in both Domain engineering and Product Line contexts. They are created based on domain requirements, commonalities, and variability. Considering that one of the essential sources of information in this context is the existing systems available in the domain, reverse engineering becomes a key activity to assist in reference architectures specification. Although many approaches consider reengineering existing systems to help in reusable components extraction and variability identification, they do not propose an approach, with well-defined activities and criteria, to support reference architectures specification from existing systems. In this context, this paper describes an approach to help in this task covering three macro-Activities, namely: reverse engineering focusing on architectural elements recovery;recovered architecture quality evaluation;and domain commonalities and variability identification. These activities are guided by general criteria, which can be reused across domains, and are supported by a tool set integrated to a reuse based software development environment, i.e. the Odyssey environment. The results of experimental studies conducted to evaluate the first two macro-Activities are described in this paper. Copyright © (2007) by Knowledge systems Institute (KSI).

关键词： computer software reusability

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A departmental reform strategy and the resultant national model for an undergraduate industrial engineering curriculum

A departmental reform strategy and the resultant national mo...

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114th Annual ASEE Conference and Exposition, 2007

作者： Furterer, Sandra Sharawi, Abeer Crumpton-Young, Lesia Rabelo, Luis Williams, Kent Gregg St John, H. East Carolina University United States Industrial Distribution and Logistics Program College of Technology and Computer Science East Carolina University United States University of Central Florida United States Industrial Engineering and Management Systems Department University of Central Florida United States EMG Consulting

This paper presents the results of an extensive research study to develop a national model for an undergraduate curriculum in Industrial engineering. A departmental reform strategy was developed and applied to reengineer the IE curriculum. The reform strategy began with identifying the voice of the customer, including both industry and academic institutions which employ or enroll IE students after they graduate with their IE undergraduate degree. The emerging topics and desired characteristics of undergraduate IE graduates were identified in an earlier research study. These emerging topics were used in a focus group to identify high-level knowledge clusters of information that future IE graduates would need to master based on possible future work scenarios. The emerging topics were mapped to the high level knowledge clusters to generate curriculum requirements of future progress. This research effort developed a revised IE curriculum that can be used as a national model for IE departments. This curriculum focuses on nontraditional industry sectors, incorporating enhanced instructional strategies that can improve learning and retention, as well as state-of-the art technologies that support these strategies. The national model also includes material to help engineers gain knowledge that will help to prepare them for roles of leadership and management in their careers, as well as provides for recruiting strategies to increase the numbers of underrepresented minorities and women in IE programs. This paper describes the approach used in this research effort to develop the national model, as well as details of the resulting model for undergraduate IE curriculum. © American Society for engineering Education, 2007.

关键词： Industrial engineering

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A systems View of a Neuromorphic VLSI Echolocation System

A Systems View of a Neuromorphic VLSI Echolocation System

引用

IEEE International Symposium on Circuits and systems (ISCAS)

作者： Timothy K. Horiuchi Matthew Cheely Electrical and Computer Engineering Department Institute for Systems Research Neuroscience and Cognitive Science Program University of Maryland College park MD USA Neuroscience and Cognitive Science Program University of Maryland College park MD USA

Echolocating bats have long demonstrated the potential for air-coupled sonar to guide agile navigation through complex 3D environments. While air-coupled sonar has been extensively used in mobile ground robotics and a considerable amount of the bat's auditory system has been studied, little work has been done to understand how the neural circuitry of the bat can integrate echoes into a coherent, behaving system. This paper addresses the unique characteristics of bat echolocation and how they impact the design of a neuromorphic VLSI-based echolocation system. By constructing a system to solve bat-specific sensorimotor tasks the authors have encountered a number of interesting issues and questions that commonly face neuromorphic VLSI designers. Successes, problematic issues, and future directions are discussed

关键词： Neuromorphics Very large scale integration Auditory system Neurons Sonar navigation Mobile robots Frequency Delay estimation Neuroscience Cognitive science

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Design and Evaluation of a Grid Computing Based Architecture for Integrating Heterogeneous IDSs

Design and Evaluation of a Grid Computing Based Architecture...

引用

IEEE GLOBECOM 2007 - IEEE Global Telecommunications Conference

作者： Paulo F. Silva Carlos B. Westphall Carla M. Westphall Marcos Dias de Assuncao Network and Management Laboratory Post-Graduate Program in Computer Science Federal University of Santa Catarina Florianopolis Brazil Grid Computing and Distributed Systems Laboratory Department of Computer Science and Software Engineering University of Melbourne VIC Australia

Intrusion detection systems (IDSs) have been substantially improved in recent past. However, network attacks have become more sophisticated and increasingly complex: many of current attacks are coordinated and originated in multiple networks. To detect these attacks, IDSs need to obtain information on network events from multiple networks or administrative domains. This work demonstrates that a Distributed IDS (DIDS) can be composed of existing IDSs, improving the detection of misuses in a multiple network environment. We use a grid middleware for creating a service-based intrusion detection grid. We demonstrate through experimental results that the proposed DIDS allows the integration of heterogeneous existing IDSs and improves the detection of attacks by exploring the synergy between existing IDSs.

关键词： Grid computing computer architecture Intrusion detection Resource management Laboratories computer science Electronic mail Middleware computer network management engineering management

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AC 2007-1771: Mentoring new faculty: How much, how often, and how?

AC 2007-1771: Mentoring new faculty: How much, how often, an...

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114th Annual ASEE Conference and Exposition, 2007

作者： Jackson, Andrew Chin, Robert Coddington, Charles Petersen, Paul Hamid, Fonooni East Carolina University United States Department of Technology Systems College of Technology and Computer Science East Carolina University United States East Carolina University Indiana State University Graduate Faculties United States EDGJ Department of Technology Systems East Carolina University United States Faculty Senate East Carolina University United States Department of Technology East Carolina University College of Technology and Computer Science United States Cleveland State University Fenn College of Engineering United States Department of Technology Systems Science Occupational Safety Program East Carolina University Greenville NC United States Academic Practice Specialty Educational Standards Committee Task Force ASSE

The Department of Technology systems (TSYS) at East Carolina University has implemented a new faculty mentoring process to enable junior faculty members to learn from senior faculty members as they prepare for a career in academia. Five tenured professors and associate professors in the TSYS department have recently established a new process to mentor faculty members within the department who have begun not yet completed their initial tenure process at a major university. This process includes a series of workshops regarding academic performance expectations during the early stages of an academic career. Our commitment to new faculty takes on several related, yet distinct features. Examples of these initiatives include: 1) reduced workloads for new faculty for the first two years to enable them to generate individual and collaborative research activities, funded grants, and publications, 2) periodic university-wide training to learn policies and procedures that affect day-to-day activities on a college campus, 3) periodic workshops hosted by senior faculty mentors, and 4) one-on-one discussions between senior faculty members and junior faculty members to encourage candid dialogue between professional colleagues. Another feature of the mentorship philosophy is a proposal to the dean of the college to offer newly hired faculty a contractual start date of July 1steach year instead of starting their contract one week prior to the start of fall classes, normally in late August. This additional period of time will be used to train new faculty in essential policies and procedures, to complete a variety of administrative tasks on campus, to get a head start on preparing for classes in the fall, and cleaning up those supplemental tasks that accompany every move to a new location. The goal of this early commitment to new faculty is to reduce the stress associated with preparing for a new course, in a new environment, with a new set of operating procedures. This will also enab

关键词： engineering education

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