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IEEE International Symposium on World of Wireless Mobile and Multimedia Networks (WoWMoM)

作者： Namrata Bapat Violet R. Syrotiuk School of Computing Informatics and Decision Systems Engineering Arizona State University Tempe AZ USA

Cognitive radios (CRs) can dynamically reconfigure their transmission and/or reception parameters. In a cognitive radio ad hoc network (CRAHN) setting, such reconfiguration is challenging due to the lack of centralized control and fixed infrastructure. In this paper, we propose a method to improve the throughput of secondary users (SUs) in a CRAHN by dynamically adapting their sensing and transmission times. First, we conduct a designed experiment on five CR parameters in the ns-2 network simulator with extensions to support CRAHNs. A statistical analysis of the resulting data attributes the contribution of each parameter, and interactions among them, to SU throughput. Based on these results, we propose for each SU to measure its instantaneous throughput and adapt its sensing and transmission times according to the predicted throughput. Simulation results demonstrate that SUs achieve higher throughput by adapting their sensing and transmission times than by using default static values for these parameters.

关键词： Throughput Sensors Adaptation models Switches Cognitive radio Data analysis

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Energy aware colocation of workload in data centers

Energy aware colocation of workload in data centers

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International Conference on High Performance computing

作者： Madhurima Pore Zahra Abbasi Sandeep K. S. Gupta Georgios Varsamopoulos Impact Lab School of Computing Informatics and Decision Systems Engineering ASU Tempe AZ USA

There exists an interference due to colocating applications which depends on the applications' workload types, degrades the performance and affects the energy consumption of applications. We hypothesize the interference energy consumption and model it as “interference coefficient” and use it to develop an application-aware colocation management policy to colocate the applications in data centers. Including the interference effect in simulations using synthetic workload in the colocation management policy results energy savings of up to 8%.

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Feature selection via regularized trees

Feature selection via regularized trees

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International Joint Conference on Neural Networks

作者： Houtao Deng Runger, George Intuit Mountain View School of Computing Informatics & Decision Systems Engineering Arizona State university

ISBN: (纸本)9781467314886

We propose a tree regularization framework, which enables many tree models to perform feature selection efficiently. The key idea of the regularization framework is to penalize selecting a new feature for splitting when its gain (e.g. information gain) is similar to the features used in previous splits. The regularization framework is applied on random forest and boosted trees here, and can be easily applied to other tree models. Experimental studies show that the regularized trees can select high-quality feature subsets with regard to both strong and weak classifiers. Because tree models can naturally deal with categorical and numerical variables, missing values, different scales between variables, interactions and nonlinearities etc., the tree regularization framework provides an effective and efficient feature selection solution for many practical problems.

关键词： Regularized boosted trees RBoost Regularized random forest RRF Tree regularization Feature extraction Trees information gain Frameworks trees

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Epistemic uncertainty in reliability-based design optimization

Epistemic uncertainty in reliability-based design optimizati...

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Annual Symposium on Reliability and Maintainability (RAMS)

作者： Xiaotian Zhuang Rong Pan School of Computing Informatics and Decision Systems Engineering Arizona State University Tempe AZ USA

Reliability-based design optimization (RBDO) needs to take into account of both aleatory and epistemic uncertainties. It is critical to explore these uncertainty sources and evaluate their impacts on RBDO. This paper provides a comprehensive study of uncertainties, in which the uncertainty sources are listed, categorized and their impacts are discussed. Epistemic uncertainty is of our interest, which is due to lack of knowledge and can be reduced. We specifically discuss the epistemic uncertainties due to unknown constraint function and unknown random variable distribution. The strategies to address epistemic uncertainty are summarized. An I-beam case study is employed to illustrate the impact of epistemic uncertainty on RBDO, in which a Kriging model is used to approximate the unknown true constraint function and the root-mean-square error (RMSE) parameter estimate is used to replace the unknown distribution parameters.

关键词： Uncertainty Computational modeling Random variables Reliability engineering Numerical models Probabilistic logic

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A transient model for data center thermal prediction

A transient model for data center thermal prediction

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International Green computing Conference

作者： Michael Jonas Rose Robin Gilbert Joshua Ferguson Georgios Varsamopoulos Sandeep K. S. Gupta Impact Laboratory School of Computing Informatics and Decision Systems Engineering ASU Tempe AZ USA

Fast thermal maps are a crucial component for many green data center design techniques. However, most state of the art work on thermal mapping ignores critical temporal aspects of thermal behavior and relies on modeling assumptions, such as the steady state assumption, that can reduce their accuracy and cause heat-induced performance throttling when used for task scheduling. These problems have the potential to affect the energy savings projected by such models. This paper introduces a fast thermal modeling technique that captures the transient behavior necessary to improve thermal prediction capability while retaining the fast thermal model required for many green data center design paradigms. This model is compared against Computational Fluid Dynamics (CFD) simulations (using OpenFOAM) and an open platform framework, namely BlueTool.

关键词： Heating Atmospheric modeling Servers Cooling Data models Transient analysis Steady-state

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A stochastic hybrid system model of collective transport in the desert ant aphaenogaster cockerelli

A stochastic hybrid system model of collective transport in ...

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16th International Conference on Hybrid systems: Computation and Control, HSCC 2013 - Part of CPSWeek 2013

作者： Kumar, Ganesh P. Buffin, Aurélie Pavlic, Theodore P. Pratt, Stephen C. Berman, Spring M. School of Computing Informatics and Decision Systems Engineering Arizona State University Tempe AZ United States School of Life Sciences Arizona State University Tempe AZ United States School for Engineering of Matter Transport and Energy Arizona State University Tempe AZ United States

ISBN: (纸本)9781450315678

Collective food transport in ant colonies is a striking, albeit poorly understood, example of coordinated group behavior in nature that can serve as a template for robust, decentralized multi-robot cooperative manipulation strategies. We investigate this behavior in Aphaenogaster cockerelli ants in order to derive a model of the ants' roles and behavioral transitions and the resulting dynamics of a transported load. In experimental trials, A. cockerelli are induced to transport a rigid artificial load to their nest. From video recordings of the trials, we obtain time series data on the load position and the population counts of ants in three roles. From our observations, we develop a stochastic hybrid system model that describes the time evolution of these variables and that can be used to derive the dynamics of their statistical moments. In our model, ants switch stochastically between roles at constant, unknown probability rates, and ants in one role pull on the load with a force that acts as a proportional controller on the load velocity with unknown gain and set point. We compute these unknown parameters by using standard numerical optimization techniques to fit the time evolution of the means of the load position and population counts to the averaged experimental time series. The close fit of our model to the averaged data and to data for individual trials demonstrates the accuracy of our proposed model in predicting the ant behavior. Copyright © 2013 ACM.

关键词： Video recording

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Optimal design for multifactor life testing experiments for exponentially distributed lifetimes

Optimal design for multifactor life testing experiments for ...

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2010 10th International Workshop on Intelligent Statistical Quality Control

作者： Englert, Brandon R. Rigdon, Steven E. Borror, Connie M. Montgomery, Douglas C. Pan, Rong Department of Mathematics and Statistics Southern Illinois University Edwardsville 1333 Science Building Edwardsville IL United States Informatics and Decision Systems Engineering School of Computing Arizona State University Tempe AZ 85281 United States

ISBN: (纸本)9783790828450

Life testing experiments differ from most experiments in a number of ways. Instead of assuming a normal distribution for the response, we often assume a distribution such as the exponential or Weibull. Also, censoring, the termination of a life test before all units have failed, is common in life testing experiments. We investigate algorithms to obtain optimal, or near-optimal designs for multifactor experiments assuming an exponential distribution for the lifetimes. © Springer-Verlag Berlin Heidelberg 2012.

关键词： Genetic algorithms

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Integrating HLA and service-oriented architecture in a simulation framework 12

Integrating HLA and service-oriented architecture in a simul...

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12th IEEE/ACM International Symposium on Cluster, Cloud and Grid computing, CCGrid 2012

作者： Dragoicea, Monica Bucur, Laurentiu Tsai, Wei-Tek Sarjoughian, Hessam Faculty of Automatic Control and Computers POLITEHNICA University Spl. Independentei nr. 313 Bucharest Romania School of Computing Informatics and Decision Systems Engineering Arizona State University Tempe AZ 85287 United States

ISBN: (纸本)9780769546919

The High-Level Architecture (HLA) is the de-facto standard in simulation interoperability. This paper presents a possible way for HLA to integrate with a service-oriented architecture (SOA) in the context of a smart building project. The paper discusses the design of an HLA federate for the inclusion of a service oriented smart building controller in the simulation loop. © 2012 IEEE.

关键词： Intelligent buildings

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Contributions and Challenges in the Design of Production systems

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IFAC Proceedings Volumes 2012年第6期45卷 1-8页

作者： Ronald G. Askin School of Computing Informatics and Decision Systems Engineering Arizona State University Tempe AZ 85287-8809 USA (Tel: 480-965-2567)

A revolution has occurred over the past hundred years in the variety of products available to improve our personal and professional lives. While new scientific discoveries enabled conceptualization of these products, it has been the innovations in operations that have made these products widely available and affordable to an increasing number of individuals. These innovations have been led by industrial engineering and operations research. In this talk we discuss the major innovations that have led to economic development and improved quality of life and then address the remaining challenges for production systems researchers. While basic procedures such as process mapping and standards are mentioned, focus will be on deterministic and probabilistic, descriptive and prescriptive, mathematical and computational models as well as new paradigms in system design. While these efforts have been highly successful we will look at some of the key technical and socio-technical issues that remain unsolved providing ample challenges and opportunities for production system researchers.

关键词： Operations research production systems queuing network models factory automation information flows inventory control

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Sensing as a service: A cloud computing system for mobile phone sensing

Sensing as a service: A cloud computing system for mobile ph...

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IEEE SENSORS

作者： Xiang Sheng Xuejie Xiao Jian Tang Guoliang Xue Department of Electrical Engineering and Computer Science Syracuse University School of Computing Informatics and Decision Systems Engineering Arizona State University

ISBN: (纸本)9781457717666

Sensors on (or attached to) mobile phones can enable attractive sensing applications in different domains such as environmental monitoring, social networking, healthcare, etc. We introduce a new concept, Sensing-as-a-Service (S 2 aaS), i.e., providing sensing services using mobile phones via a cloud computing system. An S 2 aaS cloud should meet the following requirements: 1) It must be able to support various mobile phone sensing applications on different smartphone platforms. 2) It must be energy-efficient. 3) It must have effective incentive mechanisms that can be used to attract mobile users to participate in sensing activities. In this paper, we identify unique challenges of designing and implementing an S 2 aaS cloud, review existing systems and methods, present viable solutions, and point out future research directions.

关键词： Sensors Mobile handsets Mobile communication Servers Collaboration Cloud computing Computational modeling

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