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Exploring equations ordering influence on variants of the Newton-Raphson method

AIP Conference Proceedings 2016年第1期1776卷

作者： Giulio Masetti Silvano Chiaradonna Felicita di Giandomenico 1Software Engineering and Dependable Computing Laboratory ISTI/CNR Via G. Moruzzi 1 Pisa Italy 2Computer Science Department University of Pisa Largo B. Pontecorvo 3 Pisa Italy

Jacobian-free Newton-Raphson methods are general purpose iterative non-linear system solvers. The need to solve non-linear systems is ubiquitous throughout computational physics [1] and Jacobian-free Newton-Raphson methods can offer scalability, super-linear convergence and applicability. In fact, applications span from discretized PDEs [2] to power-flow problems [3]. The focus of this article is on Inexact-Newton-Krylov [2] and Quasi-Inverse-Newton [4] methods. For both of them, we prove analytically that the initial ordering of the equations can have a great impact on the numerical solution, as well as on the number of iterations to reach the solution. We also present numerical results obtained from a simple but representative case study, to quantify the impact of initial equations ordering on a concrete scenario.

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Unified non-volatile memory and NAND flash memory architecture in smartphones

Unified non-volatile memory and NAND flash memory architectu...

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Asia and South Pacific Design Automation Conference

作者： Renhai Chen Yi Wang Jingtong Hu Duo Liu Zili Shao Yong Guan Department of Computing The Hong Kong Polytechnic University College of Computer Science and Software Engineering Shenzhen University School of Electrical and Computer Engineering Oklahoma State University College of Computer Science Chongqing University College of Computer and Information Management Capital Normal University

ISBN: (纸本)9781479977932

I/O is becoming one of major performance bottlenecks in NAND-flash-based smartphones. Novel NVMs (nonvolatile memories), such as PCM (Phase Change Memory) and STT-RAM (Spin-Transfer Torque Random Access Memory), can provide fast read/write operations. In this paper, we propose an unified NVM/flash architecture to improve the I/O performance. A transparent scheme, vFlash (Virtualized Flash), is also proposed to manage the unified architecture. Within vFlash, inter-app technique is proposed to optimize the application performance by exploiting the historic locality of applications. Since vFlash is on the bottom of the I/O stack, the application features will be lost. Therefore, we also propose a cross-layer technique to transfer the application information from the application layer to the vFlash layer. The proposed scheme is evaluated based on a real Android platform, and the experimental results show that the read and write performance for the proposed scheme is 2.45 times and 3.37 times better than that of the stock Android 4.2 system, respectively.

关键词： Nonvolatile memory Ash Smart phones Androids Humanoid robots Linux Kernel

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Learning automaton based context oriented middleware architecture for precision agriculture

Learning automaton based context oriented middleware archite...

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International Conference on Computer, Information and Telecommunication Systems (CITS)

作者： P. Venkata Krishna S. Sivanesan Sudip Misra Mohammad S. Obaidat Department of Computer Science Sri Padmavathi Mahila Visvavidyalayam Tirupati India School of Information Technology Indian Institute of Technology Kharagpur India School of Computing Science and Engineering VIT University Vellore India Dept. of Computer Science& Software Engineering Monmouth University NJ USA

The continuous alteration of living landscape in earth due to the greatest impact of information technology has converted the whole earth into a small digital village. That means anyone could share information in any form with any other person residing anywhere in the earth. With the availability of information and communication technology like cloud computing, heterogeneous networking, crowd sensing, web services and data mining, anywhere and anytime information sharing is possible, but this will bring out lot of challenges like incompatibility in standards, data portability, data aggregation, data dissemination, differential context and communication overhead. The ICT has changed many aspects of human lifestyle, work places and living spaces. However, there is one sector namely agriculture which has been deprived of the real advantages of ICT. Hence, there exists a digital divide between farming industry and other industries. Farming industry consumes large amount of natural resources such as water, energy and fertilizers that could escalate issues such as global warming, soil degradation and depletion of ground water to the next level. To reduce the global warming effect, farming industry needs to be integrated with relevant technologies. This paper proposes ubiquitous context oriented middleware architecture for precision agriculture (LA-COMPa) to solve major issues such as waste of water, improper application of fertilizer, choice of wrong crops and season, poor yield and lack of marketing.

关键词： Context Learning automata Middleware Fertilizers Manuals Soil

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An emerging technology-wearable wireless sensor networks with applications in human health condition monitoring

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Journal of Management Analytics 2015年第2期2卷 121-137页

作者： Hairong Yan LiDa Xu Zhuming Bi Zhibo Pang Jie Zhang Yong Chen Embedded Software and System Institute Beijing University of TechnologyBeijingChina Institute of Computing Technology Chinese Academy of SciencesBeijingChinaShanghai Jiao Tong UniversityShanghaiChinaUniversity of Science and Technology of ChinaHefeiChinaOld Dominion UniversityNorfolkUSA Department of Engineering Indiana University Purdue University Fort WayneFort WayneUSA ABB Corporate Research Center Sweden Old Dominion University NorfolkUSA

Monitoring health conditions over a human body to detect anomalies is a multidisciplinary task,which involves anatomy,artificial intelligence,and sensing and computing networks.A wearable wireless sensor network(WWSN)turns into an emerging technology,which is capable of acquiring dynamic data related to a human body’s physiological *** collected data can be applied to detect anomalies in a patient,so that he or she can receive an early alert about the adverse trend of the health condition,and doctors can take preventive actions *** this paper,a new WWSN for anomaly detections of health conditions has been proposed,system architecture and network has been discussed,the detecting model has been established and a set of algorithms have been developed to support the operation of the *** novelty of the detected model lies in its relevance to *** of health conditions are contextual and assessed not only based on the time and spatial correlation of the collected data,but also based on mutual relations of the data streams from different sources of sensors.A new algorithm is proposed to identify anomalies using the following procedure:(1)collected raw data is preprocessed and transferred into a set of directed graphs to represent the correlations of data streams from different sensors;(2)the directed graphs are further analyzed to identify dissimilarities and frequency patterns;(3)health conditions are quantified by a coefficient number,which depends on the identified dissimilarities and *** effectiveness and reliability of the proposed WWSN has been validated by experiments in detecting health anomalies including tachycardia,arrhythmia and myocardial infarction.

关键词： e-healthcare Internet of Things wearable wireless sensor network(WWSN) anomaly detection condition monitoring data acquisition and processing

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Envisioning a requirements specification template for medical device software

Lecture Notes in Computer Science (including subseries Lectu...

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Lecture Notes in Computer science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) 2014年 8892卷 209-223页

作者： Wang, Hao Chen, Yihai Khedri, Ridha Wassyng, Alan Aalesund University College Norway School of Computer Engineering and Science Shanghai University China Department of Computing and Software McMaster University Canada McMaster University Canada

In many health jurisdictions, software is considered to be medical device software (MDS), when it is used to analyze patient data in order to render a diagnosis or monitor the patient’s health;when it is to be used by a patient to diagnose an ailment;or when it is used to deliver functionality for a medical device. Flaws inMDS can result in patient harm, including death. Legislators and regulatory agencies publish guidelines and regulatory standards that are aimed at ensuring the safety, security and dependability of MDS. These guidelines and standards universally agree that a complete and consistent requirement specification is vital to the success of medical device software. Moreover, we observe that regulators are shifting from being process focused to being product focused in their approval guidance. In this paper, we review challenges associated with requirements used in the development of MDS, current standards and guidelines relevant to MDS, and existing templates for requirement specifications. We then propose a set of design objectives for a ‘good’ MDS requirements template and propose a template structure for MDS requirement specification fulfilling all the design objectives. Our template is, by design, tailored to facilitate the gathering and documenting of high quality requirements for MDS. © Springer International Publishing Switzerland 2014.

关键词： Diagnosis

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Privacy-Preserving authorized RFID authentication protocols

Lecture Notes in Computer Science (including subseries Lectu...

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Lecture Notes in Computer science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) 2014年 8651卷 108-122页

作者： Li, Nan Mu, Yi Susilo, Willy Guo, Fuchun Varadharajan, Vijay Centre for Computer and Information Security Research School of Computer Science and Software Engineering University of Wollongong Wollongong Australia Department of Computing Macquarie University Sydney Australia

Radio Frequency Identification (RFID) has been widely ad-opted for object identification. An RFID system comprises three essential components, namely RFID tags, readers and a backend server. Conventionally, the system is considered to be controlled by a single party who maintains all the secret information. However, in some practical scenarios, RFID tags, readers and servers could be operated by different parties. Although the private information should not be shared, the system should allow a valid tag to be authenticated by a legal reader. The challenge in designing the system is preserving the tag and reader’s privacy. In this paper, we propose a novel concept of authorized RFID authentication. The proposed protocols allow the tag to be merely identifiable by an authorized reader and the server cannot reveal the tag during the reader-server interaction. We provide a formal definition of privacy and security models of authorized authentication protocols under the strong and weak notions and propose three provably secure protocols. © Springer International Publishing Switzerland 2014.

关键词： Radio frequency identification (RFID)

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Two squares canonical factorization 18

Two squares canonical factorization

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18th Prague Stringology Conference, PSC 2014

作者： Bai, Haoyue Franek, Frantisek Smyth, William F. Department of Computing and Software McMaster University HamiltonON Canada School of Computer Science and Software Engineering University of Western Australia Australia

ISBN: (纸本)9788001055472

We present a new combinatorial structure in a string: a canonical factorization for any two squares that occur at the same position and satisfy some size restrictions. We believe that this canonical factorization will have application to related problems such as the New Periodicity Lemma, Crochemore-Rytter Three Squares Lemma, and ultimately the maximum-number-of-runs conjecture. © Czech Technical University in Prague, Czech Republic.

关键词： Double square Factorization Primitive string Square String

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An efficient privacy-preserving compressive data gathering scheme in WSNs 1

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15th International Conference on Algorithms and Architectures for Parallel Processing, ICA3PP 2015

作者： Xie, Kun Ning, Xueping Wang, Xin Wen, Jigang Liu, Xiaoxiao He, Shiming Zhang, Daqiang College of Computer Science and Electronics Engineering Hunan University Changsha410082 China The State Key Laboratory of Networking and Switching Technology Beijing University of Posts and Telecommmunications Beijing100876 China Department of Electrical and Computer Engineering State University of New York at Stony Brook New York11790 United States Institute of Computing Technology Chinese Academy of Sciences Beijing100080 China State Grid HuNan Electric Power Company Research Insitute Changsha410000 China School of Computer and Communication Engineering Changsha University of Science and Technology Changsha410114 China School of Software Engineering Tongji University Shanghai201804 China

ISBN: (数字)9783319271194

ISBN: (纸本)9783319271187

Due to the strict energy limitation and the common vulnerability of WSNs, providing efficient and security data gathering in WSNs becomes an essential problem. Compressive data gathering, which is based on the recent breakthroughs in compressive sensing theory, has been proposed as a viable approach for data gathering in WSNs at low communication overhead. Nevertheless, compressive data gathering is susceptible to various attacks due to the open wireless medium. To thwart traffic analysis/flow tracing and realize privacy preservation, this paper proposes a novel Efficient Privacy-Preserving Compressive Data Gathering Scheme which exploits homomorphic encryption functions in compressive data gathering. With homomorphic encryption on the compressive sensing encoded sensory reading messages, the proposed scheme offers two significant privacy-preserving features, message flow untraceability and message content confidentiality, for efficiently thwarting the traffic analysis attacks. Extensive performance evaluations and security analysis demonstrate the validity and efficiency of the proposed scheme. © Springer International Publishing Switzerland 2015.

关键词： Compressed sensing

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Cross-project build co-change prediction

Cross-project build co-change prediction

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IEEE International Conference on software Analysis, Evolution and Reengineering (SANER)

作者： Xin Xia David Lo Shane McIntosh Emad Shihab Ahmed E. Hassan College of Computer Science and Technology Zhejiang University Hangzhou China School of Information Systems Singapore Management University Singapore School of Computing Queen's University Kingston Canada Department of Computer Science and Software Engineering Concordia University Montreal Canada

Build systems orchestrate how human-readable source code is translated into executable programs. In a software project, source code changes can induce changes in the build system (aka. build co-changes). It is difficult for developers to identify when build co-changes are necessary due to the complexity of build systems. Prediction of build co-changes works well if there is a sufficient amount of training data to build a model. However, in practice, for new projects, there exists a limited number of changes. Using training data from other projects to predict the build co-changes in a new project can help improve the performance of the build co-change prediction. We refer to this problem as cross-project build co-change prediction. In this paper, we propose CroBuild, a novel cross-project build co-change prediction approach that iteratively learns new classifiers. CroBuild constructs an ensemble of classifiers by iteratively building classifiers and assigning them weights according to its prediction error rate. Given that only a small proportion of code changes are build co-changing, we also propose an imbalance-aware approach that learns a threshold boundary between those code changes that are build co-changing and those that are not in order to construct classifiers in each iteration. To examine the benefits of CroBuild, we perform experiments on 4 large datasets including Mozilla, Eclipse-core, Lucene, and Jazz, comprising a total of 50,884 changes. On average, across the 4 datasets, CroBuild achieves a F1-score of up to 0.408. We also compare CroBuild with other approaches such as a basic model, AdaBoost proposed by Freund et al., and TrAdaBoost proposed by Dai et al.. On average, across the 4 datasets, the CroBuild approach yields an improvement in F1-scores of 41.54%, 36.63%, and 36.97% over the basic model, AdaBoost, and TrAdaBoost, respectively.

关键词： Predictive models Training Data models Measurement Error analysis Buildings Training data

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Virtual Machine Image Content Aware I/O Optimization for Mobile Virtualization

Virtual Machine Image Content Aware I/O Optimization for Mob...

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IEEE International Symposium on Cyberspace Safety and Security

作者： Renhai Chen Yi Wang Jingtong Hu Duo Liu Zili Shao Yong Guan Embedded Systems and CPS Laboratory Department of Computing The Hong Kong Polytechnic University College of Computer Science and Software Engineering Shenzhen University School of Electrical and Computer Engineering Oklahoma State University College of Computer Science Chongqing University College of Computer and Information Management Capital Normal University

ISBN: (纸本)9781479989386

Mobile virtualization introduces extra layers in software stacks, which leads to performance degradation. Especially, each I/O operation has to pass through several software layers to reach the NAND-flash-based storage systems. This paper targets at optimizing I/O for mobile virtualization, since I/O becomes one of major performance bottlenecks that seriously affects the performance of mobile devices. Among all the I/O operations, a large percentage is updating metadata. Frequent updating metadata not only degrades overall I/O performance but also severely reduces flash memory lifetime. In this paper, we propose a novel I/O optimization technique to identify the metadata of a guest file system which is stored in a VM (Virtual Machine) image file and frequently updated. Then, these metadata are stored in a small additional NVM (Non-Volatile Memory) which is faster and more endurable to greatly improve flash memory's performance and lifetime. To the best of our knowledge, this is the first work to identify the file system metadata from regular data in a guest OS VM image file under mobile virtualization. The proposed scheme is evaluated on a real hardware embedded platform. The experimental results show that the proposed techniques can improve write performance to 45.21% in mobile devices with virtualization.

关键词： IO Virtualization Metadata Mobile devices virtual machines Cache Memory System degradation of performance Mobile Conference documents

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