Incremental learning has recently received broad attention in many applications of patternrecognition and datamining. With many typical incremental learning situations in the real world where a fast response to chan...
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ISBN:
(纸本)9783642202667
Incremental learning has recently received broad attention in many applications of patternrecognition and datamining. With many typical incremental learning situations in the real world where a fast response to changing data is necessary, developing a parallel implementation (in fast processing units) will give great impact to many applications. Current research on incremental learning methods employs a modified version of a resource allocating network (RAN) which is one variation of a radial basis function network (RBFN). this paper evaluates the impact of a Graphics Processing Units (GPU) based implementation of a RAN network incorporating Long Term Memory (LTM) [4]. the incremental learning algorithm is compared withthe batch RBF approach in terms of accuracy and computational cost, both in sequential and GPU implementations. the UCI machinelearning benchmark datasets and a real world problem of multimedia forgery detection were considered in the experiments. the preliminary evaluation shows that although the creation of the model is faster withthe RBF algorithm, the RAN-LTM can be useful in environments withthe need of fast changing models and high-dimensional data.
the problem of job stress is generally recognized as one of the major factors leading to a spectrum of health problems. People with certain professions, like intensive care specialists or call-center operators, and pe...
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Providing methods to support semantic interaction with growing volumes of video data is an increasingly important challenge for datamining. To this end, there has been some success in recognition of simple objects an...
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mining web traffic data has been addressed in literature mostly using sequential patternmining techniques. Recently, a more powerful pattern called partial order was introduced, withthe hope of providing a more comp...
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Affective computing (AC) is a unique discipline which includes modeling affect using one or multiple modalities by drawing on techniques from many different fields. AC often deals with problems that are known to be ve...
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ISBN:
(纸本)9783642245701
Affective computing (AC) is a unique discipline which includes modeling affect using one or multiple modalities by drawing on techniques from many different fields. AC often deals with problems that are known to be very complex and multi-dimensional, involving different kinds of data (numeric, symbolic, visual etc.). However, withthe advancement of machinelearning techniques, a lot of those problems are now becoming more tractable.
In this paper, we propose a nearest neighbor based outlier detection algorithm, N DoT. We introduce a parameter termed as Nearest Neighbor Factor (NNF) to measure the degree of outlierness of a point with respect to i...
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ISBN:
(纸本)9783642217869
In this paper, we propose a nearest neighbor based outlier detection algorithm, N DoT. We introduce a parameter termed as Nearest Neighbor Factor (NNF) to measure the degree of outlierness of a point with respect to its neighborhood. Unlike the previous outlier detection methods N DoT works by a voting mechanism. Voting mechanism binarizes the decision compared to the top-N style of algorithms. We evaluate our method experimentally and compare results of N DoT with a classical outlier detection method LOF and a recently proposed method LDOF. Experimental results demonstrate that N DoT outperforms LDOF and is comparable with LOF.
Over the past several years, several extensions to Bayesian knowledge tracing have been proposed in order to improve predictions of students' in-tutor and post-test performance. One such extension is Contextual Gu...
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ISBN:
(纸本)9789038625379
Over the past several years, several extensions to Bayesian knowledge tracing have been proposed in order to improve predictions of students' in-tutor and post-test performance. One such extension is Contextual Guess and Slip, which incorporates machine-learned models of students' guess and slip behaviors in order to enhance the overall model's predictive performance [Baker et al. 2008a]. Similar machinelearning approaches have been introduced in order to detect specific problem-solving steps during which students most likely learned particular skills [Baker, Goldstein, and Heffernan in press]. However, one important class of features that have not been considered in machinelearning models used in these two techniques is metrics of item and skill difficulty, a key type of feature in other assessment frameworks [e.g Hambleton, Swaminathan, & Rogers, 1991;Pavlik, Cen, & Koedinger 2009]. In this paper, a set of engineered features that quantify skill difficulty and related skill-level constructs are investigated in terms of their ability to improve models of guessing, slipping, and detecting moment-by-moment learning. Supervised machinelearning models that have been trained using the new skill-difficulty features are compared to models from the original contextual guess and slip and moment-by-moment learning detector work. this includes performance comparisons for predicting students' in-tutor responses, as well as post-test responses, for a pair of Cognitive Tutor data sets.
Winner-Take-All (WTA) and its extended version K-Winner-Take-All (KWTA) networks have been frequently used as the classifiers in neural networks. they are very important tools in datamining, machinelearning and Patt...
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this paper presents the development of a supervision system for predictive maintenance and diagnosis of turbo-generators. the aim of the developed system is to verify the degradation conditions of TermoNorte generator...
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this paper presents the development of a supervision system for predictive maintenance and diagnosis of turbo-generators. the aim of the developed system is to verify the degradation conditions of TermoNorte generators. Initially, a system for extracting features of the turbo-generator operational database has been developed to detect possible problems that cause premature fails. the system has been divided in two parts. the first one is a data acquisition system directly connected to the generator in order to sample some operational variables. the second part concerns an intelligent datamining, based on Rough Sets theory, into the database involving the supervision system variables, to use the existing historic data to perform analysis of the problems and possible causes.
Nowadays we are faced with fast growing and permanently evolving data, including social networks and sensor data recorded from smart phones or vehicles. Temporally evolving data brings a lot of new challenges to the d...
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ISBN:
(纸本)9781450308328
Nowadays we are faced with fast growing and permanently evolving data, including social networks and sensor data recorded from smart phones or vehicles. Temporally evolving data brings a lot of new challenges to the datamining and machinelearning community. this paper is concerned withthe recognition of recurring patterns within multivariate time series, which capture the evolution of multiple parameters over a certain period of time. Our approach first separates a time series into segments that can be considered as situations, and then clusters the recognized segments into groups of similar context. the time series segmentation is established in a bottom-up manner according the correlation of the individual signals. Recognized segments are grouped in terms of statistical features using agglomerative hierarchical clustering. the proposed approach is evaluated on the basis of real life sensor data from different vehicles recorded during car drives. According to our evaluation it is feasible to recognize recurring patterns in time series by means of bottom-up segmentation and hierarchical clustering. Copyright 2011 ACM.
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