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A Sensitivity-Based Improving Learning Algorithm for Madaline Rule II

MATHEMATICAL PROBLEMS IN ENGINEERING 2014年第1期2014卷 1-8页

作者： Zhong, Shuiming Xue, Yu Jiang, Yunhao Jin, Yuanfeng Yang, Jing Yang, Ping Tian, Yuan Al-Rodhaan, Mznah Nanjing Univ Informat Sci & Technol Jiangsu Engn Ctr Network Monitoring Nanjing 210044 Jiangsu Peoples R China Nanjing Univ Informat Sci & Technol Sch Comp & Software Nanjing 210044 Jiangsu Peoples R China Yanbian Univ Dept Math Jilin 133002 Yanji Peoples R China Beijing Normal Univ Zhuhai 519087 Peoples R China King Saud Univ Coll Comp & Informat Sci Dept Comp Sci Riyadh 11362 Saudi Arabia

This paper proposes a new adaptive learning algorithm for Madalines based on a sensitivity measure that is established to investigate the effect of a Madaline weight adaptation on its output. The algorithm, following the basic idea of minimal disturbance as the MRII did, introduces an adaptation selection rule by means of the sensitivity measure to more accurately locate the weights in real need of adaptation. Experimental results on some benchmark data demonstrate that the proposed algorithm has much better learning performance than the MRII and the BP algorithms.

关键词： MACHINE learning SENSITIVITY analysis BACK propagation (Artificial intelligence) DATA analysis computer algorithms

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The Many Meanings of Live Coding

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computer MUSIC JOURNAL 2014年第1期38卷 65-76页

作者： Sorensen, Andrew Swift, Ben Riddell, Alistair Queensland Univ Technol Inst Future Environm Brisbane Qld 4001 Australia Australian Natl Univ Sch Comp Sci Canberra ACT 0200 Australia Australian Natl Univ Sch Art Canberra ACT 0200 Australia

The ten-year anniversary of TOPLAP presents a unique opportunity for reflection and introspection. In this essay we ask the question, what is the meaning of live coding? Our goal is not to answer this question, in absolute terms, but rather to attempt to unpack some of live coding's many meanings. Our hope is that by exploring some of the formal, embodied, and cultural meanings surrounding live-coding practice, we may help to stimulate a conversation that will resonate within the live-coding community for the next ten years.

关键词： computer music computer composition computer programming computer algorithms PROGRAMMING languages (Electronic computers)

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Old and New algorithms for Minimal Coverability Sets

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FUNDAMENTA INFORMATICAE 2014年第1期131卷 1-25页

作者： Valmari, Antti Hansen, Henri Tampere Univ Technol Dept Math FI-33101 Tampere Finland Natl Univ Singapore Temasek Labs Singapore 117548 Singapore Tampere Univ Technol Dept Software Syst FI-33101 Tampere Finland

Many algorithms for computing minimal coverability sets for Petri nets prune futures. That is, if a new marking strictly covers an old one, then not just the old marking but also some subset of its successor markings is discarded from search. In this publication, a simpler algorithm that lacks future pruning is presented and proven correct. Its performance is compared with future pruning. It is demonstrated, using examples, that neither approach is systematically better than the other. However, the simple algorithm has some attractive features. It never needs to re-construct pruned parts of the minimal coverability set. It automatically gives most of the advantage of future pruning, if the minimal coverability set is constructed in depth-first or most tokens first order, and if so-called history merging is applied. Some implementation aspects of minimal coverability set construction are also discussed. Some measurements are given to demonstrate the effect of construction order and other implementation aspects.

关键词： computer algorithms SET theory PETRI nets SEARCH engines MATHEMATICAL proofs

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Learning with both unlabeled data and query logs for image search

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computerS & ELECTRICAL ENGINEERING 2014年第3期40卷 964-973页

作者： Wu, Jun Xiao, Zhi-Bo Wang, Hai-Shuai Shen, Hong Beijing Jiaotong Univ Sch Comp & Informat Technol Beijing 100044 Peoples R China Beijing Key Lab Traff Data Anal & Min Beijing 100044 Peoples R China Dalian Maritime Univ Sch Informat Sci & Technol Dalian 116026 Peoples R China Univ Technol Sydney FEIT Ctr Quantum Computat & Intelligent Syst Sydney NSW 2007 Australia

One of the challenges in image search is to learn with few labeled examples. Existing solutions mainly focus on leveraging either unlabeled data or query logs to address this issue, but little is known in taking both into account. This work presents a novel learning scheme that exploits both unlabeled data and query logs through a unified Manifold Ranking (MR) framework. In particular, we propose a local scaling technique to facilitate MR by self-tuning the scale parameter, and a soft label propagation strategy to enhance the robustness of MR against erroneous query logs. Further, within the proposed MR framework, a hybrid active learning method is developed, which is effective and efficient to select the informative and representative unlabeled examples, so as to maximally reduce users' labeling effort. An empirical study shows that the proposed scheme is significantly more effective than the state-of-the-art approaches. (C) 2013 Elsevier Ltd. All rights reserved.

关键词： MACHINE learning DATA analysis QUERYING (computer science) IMAGE analysis LOGARITHMS MATRICES computer algorithms

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Closed-Loop Precision Throttling of a Hybrid Rocket Motor

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JOURNAL OF PROPULSION AND POWER 2014年第2期30卷 325-336页

作者： Whitmore, Stephen A. Peterson, Zachary W. Eilers, Shannon D. Utah State Univ Dept Mech & Aerosp Engn Logan UT 84322 USA

A closed-loop throttle controller for a laboratory-scale N2O and hydroxyl-terminated polybutadiene hybrid rocket motor is presented. Closed-loop throttling was achieved using commercial off-the-shelf valve hardware and a commercially available motor case adapted for hybrid rocket testing. Multiple and open- and closed-loop tests were performed to demonstrate that closed-loop control can significantly reduce the run-to-run burn variability typical of hybrid rocket motors. Closed-loop proportional/integral control algorithms featuring thrust or pressure feedback were used to track prescribed step and linear ramp profiles. Because the relationship between the selected throttle control valve position and the effective valve flow area was highly nonlinear, the effect of valve position on motor thrust/chamber pressure was measured open loop and curve fit to allow direct command of either total thrust or chamber pressure. Control law gains were tuned a priori using a numerical model and then adjusted using the actual test hardware. Response profiles were optimized according the integral absolute error criterion. Control law tuning examples are presented. Test results indicate that, to a 95% confidence level, closed-loop throttling significantly reduces the mean run-to-run thrust variability from +/- 9.1% to less than +/- 3.9%. When effects of nozzle erosion are accounted for, the closed-loop thrust variability reduces to +/- 1.5%.

关键词： loop test thrust THROTTLE VALVE Hybrid Rocket Motor valve location CLOSED LOOP CONTROL ENGINE COVER computer algorithms

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Hyperbolic tangent function-based least mean-square control algorithm for distribution static compensator

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IET GENERATION TRANSMISSION & DISTRIBUTION 2014年第12期8卷 2102-2113页

作者： Singh, Bhim Dube, Sunil Kumar Arya, Sabha Raj Indian Inst Technol Delhi Dept Elect Engn New Delhi 110016 India

A variable learning rate least mean-square (LMS) based on hyperbolic tangent function is used to enhance the rate of convergence and to suppress the existing noise in the system for the control of distribution static compensator (DSTATCOM) consisting of a three-leg voltage source converter (VSC) with a zig-zag transformer to eliminate the significant neutral current caused by non-linear unbalanced loads in a three-phase four-wire supply system. Simulation is made for the proposed control algorithm in three-phase four-wire DSTATCOM system and its performance is compared with the conventional Adaline-based LMS control algorithm. It is also shown that the convergence rate of the proposed control algorithm is quite faster in comparison with the conventional control algorithm. A prototype of DSTATCOM is developed and the real-time implementation of the proposed control algorithm is performed on a digital signal processor. Test results have demonstrated the satisfactory performance of DSTATCOM with the proposed control algorithm under linear and non-linear loads.

关键词： Static compensator three-phase four-wire hyperbolic tangent computer algorithms

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Multiple reference octrees for a GPU photon mapping and irradiance caching

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PROGRAMMING AND computer SOFTWARE 2014年第4期40卷 208-214页

作者： Frolov, V. A. Kharlamov, A. A. Galaktionov, V. A. Vostryakov, K. A. Keldysh Inst Appl Math RAS Miusskaya Sq 4 Moscow 125047 Russia Nvidia Moscow Moscow Russia

This paper introduces an efficient and simple algorithm for constructing Multiple Reference (MR) octrees on a GPU in application to Photon Mapping and Irradiance Caching techniques. Although MR-octrees are hierarchical structures, we successfully ignore their hierarchical nature and present an approach with plain construction, compact data layout and stack-less traversal. Our algorithm uses only 2 parallel primitives (parallel append and parallel sort) and can be expressed in several lines of pseudo-code.

关键词： computer algorithms SPECTRAL irradiance computer programming PARALLEL computers OCTREES (computer graphics)

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Sparse Representation of Transients Based on Wavelet Basis and Majorization-Minimization Algorithm for Machinery Fault Diagnosis

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MATHEMATICAL PROBLEMS IN ENGINEERING 2014年第1期2014卷 1-11页

作者： Fan, Wei Cai, Gaigai Huang, Weiguo Shang, Li Zhu, Zhongkui Soochow Univ Sch Urban Rail Transportat Suzhou 215137 Peoples R China Xi An Jiao Tong Univ State Key Lab Mfg Syst Engn Xian 710049 Peoples R China Suzhou Vocat Univ Coll Elect Informat Suzhou 215104 Peoples R China

Vibration signals captured from faulty mechanical components are often associated with transients which are significant for machinery fault diagnosis. However, the existence of strong background noise makes the detection of transients a basis pursuit denoising (BPD) problem, which is hard to be solved in explicit form. With sparse representation theory, this paper proposes a novel method for machinery fault diagnosis by combining the wavelet basis and majorization-minimization (MM) algorithm. This method converts transients hidden in the noisy signal into sparse coefficients;thus the transients can be detected sparsely. Simulated study concerning cyclic transient signals with different signal-to-noise ratio (SNR) shows that the effectiveness of this method. The comparison in the simulated study shows that the proposed method outperforms the method based on split augmented Lagrangian shrinkage algorithm (SALSA) in convergence and detection effect. Application in defective gearbox fault diagnosis shows the fault feature of gearbox can be sparsely and effectively detected. A further comparison between this method and the method based on SALSA shows the superiority of the proposed method in machinery fault diagnosis.

关键词： WAVELETS (Mathematics) computer algorithms DEBUGGING in computer science VIBRATION (Mechanics) SIGNAL processing EXISTENCE theorems

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Strategy synthesis for multi-dimensional quantitative objectives

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ACTA INFORMATICA 2014年第3-4期51卷 129-163页

作者： Chatterjee, Krishnendu Randour, Mickael Raskin, Jean-Francois IST Austria Inst Sci & Technol Austria A-3400 Klosterneuburg Austria Univ Mons UMONS Dept Comp Sci B-7000 Mons Belgium Univ Libre Bruxelles Dept Informat B-1050 Brussels Belgium

Multi-dimensional mean-payoff and energy games provide the mathematical foundation for the quantitative study of reactive systems, and play a central role in the emerging quantitative theory of verification and synthesis. In this work, we study the strategy synthesis problem for games with such multi-dimensional objectives along with a parity condition, a canonical way to express -regular conditions. While in general, the winning strategies in such games may require infinite memory, for synthesis the most relevant problem is the construction of a finite-memory winning strategy (if one exists). Our main contributions are as follows. First, we show a tight exponential bound (matching upper and lower bounds) on the memory required for finite-memory winning strategies in both multi-dimensional mean-payoff and energy games along with parity objectives. This significantly improves the triple exponential upper bound for multi energy games (without parity) that could be derived from results in literature for games on vector addition systems with states. Second, we present an optimal symbolic and incremental algorithm to compute a finite-memory winning strategy (if one exists) in such games. Finally, we give a complete characterization of when finite memory of strategies can be traded off for randomness. In particular, we show that for one-dimension mean-payoff parity games, randomized memoryless strategies are as powerful as their pure finite-memory counterparts.

关键词： QUANTITATIVE research MATHEMATICAL analysis SPECTRAL synthesis (Mathematics) BOUNDS (Mathematics) computer algorithms computer science GAME theory

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Accurate Fault Classifier and Locator for EHV Transmission Lines Based on Artificial Neural Networks

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MATHEMATICAL PROBLEMS IN ENGINEERING 2014年第1期2014卷 1-19页

作者： Ben Hessine, Moez Ben Saber, Souad Univ Tunis ENSIT Higher Natl Engn Sch Tunis Latice Lab Tunis 1008 Tunisia

The ability to identify the fault type and to locate the fault in extra high voltage transmission lines is very important for the economic operation of modern power systems. Accurate algorithms for fault classification and location based on artificial neural network are suggested in this paper. Two fault classification algorithms are presented;the first one uses the single ANN approach and the second one uses the modular ANN approach. A comparative study of two classifiers is done in order to choose which ANN fault classifier structure leads to the best performance. Design and implementation of modular ANN-based fault locator are presented. Three fault locators are proposed and a comparative study of the three fault locators is carried out in order to determine which fault locator architecture leads to the accurate fault location. Instantaneous current and/or voltage samples were used as inputs to ANNs. For fault classification, only the pre-fault and post-fault samples of three-phase currents were used. For fault location, pre-fault and post-fault samples of three-phase currents and/or voltages were used. The proposed algorithms were evaluated under different fault scenarios. Studied simulation results which are presented confirm the effectiveness of the proposed algorithms.

关键词： HIGH voltages SIMULATION methods & models NEURAL networks (computer science) FAULT location (Engineering) computer algorithms

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