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Adaptive nonparametric control chart for time-varying and multimodal processes

JOURNAL OF PROCESS CONTROL 2016年 37卷 34-45页

作者： Kang, Ji Hoon Yu, Jaehong Kim, Seoung Bum Samsung SDS Algorithm Res Ctr Ind Technol Lab Seoul 138240 South Korea Korea Univ Dept Ind Management Engn Seoul 136713 South Korea Rutgers State Univ Ctr Discrete Math & Theoret Comp Sci Piscataway NJ 08854 USA

Multivariate statistical process control techniques have been widely used to improve processes by reducing variation and preventing defects. In modern manufacturing, because of the complexity and variability of processes, traditional multivariate control charts such as Hotelling's T-2 cannot efficiently handle situations in which the patterns of process observations are nonlinear, multimodal, and time varying. In the present study, we propose a nonparametric control chart, which is capable of adaptively monitoring time-varying and multimodal processes. Experiments with simulated and real process data from a thin film transistor-liquid crystal display (TFT-LCD) demonstrate the effectiveness and accuracy of the proposed method. (C) 2015 Elsevier Ltd. All rights reserved.

关键词： Clustering data mining algorithm Multivariate control chart Multimodality Time-varying process False alarms

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Detection of broiler heat stress by using the generalised sequential pattern algorithm

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BIOSYSTEMS ENGINEERING 2020年 199卷 121-126页

作者： Branco, Tatiane Moura, Daniella J. Naas, Irenilza A. Oliveira, Stanley R. M. Univ Estadual Campinas Coll Agr Engn Campinas SP Brazil Embrapa Agr Informat Campinas SP Brazil

The sequence pattern mining method aims to identify frequent sequences that exceed a user-specified support threshold. The present study uses the same approach based on sequential standards to estimate the heat stress of broilers from a resulting behavioural pattern. Experimental data were recorded in a climate chamber where the behaviour of broilers was recorded under thermoneutral (comfort) conditions, set as standard, and when exposed to thermal stress (cold and heat). The Generalised Sequential Patterns (GSP) algorithm was used to evaluate the heat stress of broilers in the third and fourth week of growth. The results indicated that the mining of pattern sequences is a useful and straightforward technique to estimate the welfare of broiler chickens, allowing the identification of temporal relations between thermal stress and the consequent behaviour of the broiler. Temperature 8 degrees C below the standard thermoneutral conditions showed that the broiler remained lying down most of the time, walking only to the drinker and feeder trough. Broilers exposed to temperatures 8 degrees C above the standard thermoneutral conditions () tend to decrease locomotor activities, showing lower welfare status. (C) 2019 Published by Elsevier Ltd on behalf of IAgrE.

关键词： Animal welfare Behavioural pattern data mining algorithm Detection of sequential frequency

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Supervised inductive learning with Lotka-Volterra derived models

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KNOWLEDGE AND INFORMATION SYSTEMS 2011年第2期26卷 195-223页

作者： Hovsepian, Karen Anselmo, Peter Mazumdar, Subhasish O Wayne Rollins Res Ctr Taylor Lab Atlanta GA 30322 USA Emory Univ Dept Biol Atlanta GA 30329 USA New Mexico Inst Min & Technol Dept Management Socorro NM 87801 USA New Mexico Inst Min & Technol Dept Comp Sci Socorro NM 87801 USA

We present a classification algorithm built on our adaptation of the Generalized Lotka-Volterra model, well-known in mathematical ecology. The training algorithm itself consists only of computing several scalars, per each training vector, using a single global user parameter and then solving a linear system of equations. Construction of the system matrix is driven by our model and based on kernel functions. The model allows an interesting point of view of kernels' role in the inductive learning process. We describe the model through axiomatic postulates. Finally, we present the results of the preliminary validation experiments.

关键词： Supervised machine learning Classification Lotka-Volterra model data mining algorithm Generalization theory

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One-Class Classification-Based Control Charts for Monitoring Autocorrelated Multivariate Processes

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COMMUNICATIONS IN STATISTICS-SIMULATION AND COMPUTATION 2010年第3期39卷 461-474页

作者： Kim, Seoung Bum Jitpitaklert, Weerawat Sukchotrat, Thuntee Korea Univ Div Informat Management Engn Seoul South Korea Univ Texas Arlington Dept Ind & Mfg Syst Engn Arlington TX 76019 USA

In recent years, statistical process control (SPC) of multivariate and autocorrelated processes has received a great deal of attention. Modern manufacturing/service systems with more advanced technology and higher production rates can generate complex processes in which consecutive observations are dependent and each variable is correlated. These processes obviously violate the assumption of the independence of each observation that underlies traditional SPC and thus deteriorate the performance of its traditional tools. The popular way to address this issue is to monitor the residualsthe difference between the actual value and the fitted valuewith the traditional SPC approach. However, this residuals-based approach requires two steps: (1) finding the residuals;and (2) monitoring the process. Also, an accurate prediction model is necessary to obtain the uncorrelated residuals. Furthermore, these residuals are not the original values of the observations and consequently may have lost some useful information about the targeted process. The main purpose of this article is to examine the feasibility of using one-class classification-based control charts to handle multivariate and autocorrelated processes. The article uses simulated data to present an analysis and comparison of one-class classification-based control charts and the traditional Hotelling's T2 chart.

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A Web Semantic mining Method for Fake Cybersecurity Threat Intelligence in Open Source Communities

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INTERNATIONAL JOURNAL ON SEMANTIC WEB AND INFORMATION SYSTEMS 2024年第1期20卷 1页

作者： Li, Zhihua Yu, Xinye Zhao, Yukai Jiangnan Univ Wuxi Peoples R China

In order to overcome the challenges of inadequate classification accuracy in existing fake cybersecurity threat intelligence mining methods and the lack of high-quality public datasets for training classification models, we propose a novel approach that significantly advances the field. We improved the attention mechanism and designed a generative adversarial network based on the improved attention mechanism to generate fake cybersecurity threat intelligence. Additionally, we refine text tokenization techniques and design a detection model to detect fake cybersecurity threats intelligence. Using our STIX-CTIs dataset, our method achieves a remarkable accuracy of 96.1%, outperforming current text classification models. Through the utilization of our generated fake cybersecurity threat intelligence, we successfully mimic data poisoning attacks within open-source communities. When paired with our detection model, this research not only improves detection accuracy but also provides a powerful tool for enhancing the security and integrity of open-source ecosystems.

关键词： Cybersecurity Threat Intelligence Fake Threat Intelligence Generation data mining algorithm

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mining sequential patterns by pattern-growth: The PrefixSpan approach

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IEEE TRANSACTIONS ON KNOWLEDGE AND data ENGINEERING 2004年第11期16卷 1424-1440页

作者： Pei, J Han, JW Mortazavi-Asl, B Wang, JY Pinto, H Chen, QM Dayal, U Hsu, MC Simon Fraser Univ Sch Comp Sci Burnaby BC V5A 1S6 Canada Univ Illinois Dept Comp Sci Urbana IL 61801 USA Univ Minnesota Minneapolis MN 55455 USA Simon Fraser Univ Sch Comp Sci Burnaby BC V5A 1S6 Canada Packetmot Inc San Mateo CA 94403 USA Hewlett Packard Labs Palo Alto CA 94303 USA Commerce One Inc San Francisco CA 94105 USA

Sequential pattern mining is an important data mining problem with broad applications. However, it is also a difficult problem since the mining may have to generate or examine a combinatorially explosive number of intermediate subsequences. Most of the previously developed sequential pattern mining methods, such as GSP, explore a candidate generation-and-test approach [1] to reduce the number of candidates to be examined. However, this approach may not be efficient in mining large sequence databases having numerous patterns and/or long patterns. In this paper, we propose a projection-based, sequential pattern-growth approach for efficient mining of sequential patterns. In this approach, a sequence database is recursively projected into a set of smaller projected databases, and sequential patterns are grown in each projected database by exploring only locally frequent fragments. Based on an initial study of the pattern growth-based sequential pattern mining, FreeSpan [8], we propose a more efficient method, called PSP, which offers ordered growth and reduced projected databases. To further improve the performance, a pseudoprojection technique is developed in PrefixSpan. A comprehensive performance study shows that PrefixSpan, in most cases, outperforms the a priori-based algorithm GSP, FreeSpan, and SPADE [29] ( a sequential pattern mining algorithm that adopts vertical data format), and PrefixSpan integrated with pseudoprojection is the fastest among all the tested algorithms. Furthermore, this mining methodology can be extended to mining sequential patterns with user-specified constraints. The high promise of the pattern-growth approach may lead to its further extension toward efficient mining of other kinds of frequent patterns, such as frequent substructures.

关键词： data mining algorithm sequential pattern frequent pattern transaction database sequence database scalability performance analysis

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Monitoring Distillation Column Systems Using Improved Nonlinear Partial Least Squares-Based Strategies

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IEEE SENSORS JOURNAL 2019年第23期19卷 11697-11705页

作者： Madakyaru, Muddu Harrou, Fouzi Sun, Ying Manipal Acad Higher Educ Dept Chem Engn Manipal Inst Technol Manipal 576104 Karnataka India KAUST Comp Elect & Math Sci & Engn CEMSE Div Thuwal 239556900 Saudi Arabia

Fault detection in industrial systems plays a core role in improving their safety, productivity and avoiding expensive maintenance. This paper proposed and verified data-driven anomaly detection schemes based on a nonlinear latent variable model and statistical monitoring algorithms. Integrating both the suitable characteristics of partial least squares (PLS) and adaptive neural network fuzzy inference systems (ANFIS) procedure, PLS-ANFIS model is employed to allow for flexible modeling of multivariable nonlinear processes. Furthermore, PLS-ANFIS modeling was connected with k-nearest neighbors (kNN)-based data mining schemes and employed for nonlinear process monitoring. Specifically, residuals generated from the PLS-ANFIS model are used as the input to the kNN-based mechanism to uncover anomalies in the data. Moreover, kNN-based exponentially smoothing with parametric and nonparametric thresholds is adopted to better anomaly detection. The effectiveness of the proposed approach is evaluated using real measurements from an actual bubble cap distillation column.

关键词： Anomaly detection data mining algorithm unsupervised monitoring distillation column systems

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An UpDown Directed Acyclic Graph Approach for Sequential Pattern mining

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IEEE TRANSACTIONS ON KNOWLEDGE AND data ENGINEERING 2010年第7期22卷 913-928页

作者： Chen, Jinlin CUNY Queens Coll Dept Comp Sci Flushing NY 11367 USA

Traditional pattern growth-based approaches for sequential pattern mining derive length-(k + 1) patterns based on the projected databases of length-k patterns recursively. At each level of recursion, they unidirectionally grow the length of detected patterns by one along the suffix of detected patterns, which needs k levels of recursion to find a length-k pattern. In this paper, a novel data structure, UpDown Directed Acyclic Graph (UDDAG), is invented for efficient sequential pattern mining. UDDAG allows bidirectional pattern growth along both ends of detected patterns. Thus, a length-k pattern can be detected in left perpendicular log(2)k + 1 right perpendicular levels of recursion at best, which results in fewer levels of recursion and faster pattern growth. When minSup is large such that the average pattern length is close to 1, UDDAG and PrefixSpan have similar performance because the problem degrades into frequent item counting problem. However, UDDAG scales up much better. It often outperforms PrefixSpan by almost one order of magnitude in scalability tests. UDDAG is also considerably faster than Spade and LapinSpam. Except for extreme cases, UDDAG uses comparable memory to that of PrefixSpan and less memory than Spade and LapinSpam. Additionally, the special feature of UDDAG enables its extension toward applications involving searching in large spaces.

关键词： data mining algorithm directed acyclic graph performance analysis sequential pattern transaction database

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SMOTEFUNA: Synthetic Minority Over-Sampling Technique Based on Furthest Neighbour algorithm

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IEEE ACCESS 2020年 8卷 59069-59082页

作者： Tarawneh, Ahmad S. Hassanat, Ahmad B. A. Almohammadi, Khalid Chetverikov, Dmitry Bellinger, Colin Eotvos Lorand Univ Dept Algorithms & Their Applicat H-1117 Budapest Hungary Mutah Univ Dept Comp Sci Al Karak 61711 Jordan Univ Tabuk Community Coll Dept Comp Sci Tabuk 71491 Saudi Arabia Univ Tabuk Ind Innovat & Robot Ctr Tabuk 71491 Saudi Arabia Inst Comp Sci & Control Budapest Hungary CNR Ottawa ON K1A 0R6 Canada

Class imbalance occurs in classification problems in which the "normal" cases, or instances, significantly outnumber the "abnormal" instances. Training a standard classifier on imbalanced data leads to predictive biases which cause poor performance on the class(es) with lower prior probabilities. The less frequent classes are often critically important events, such as system failure or the occurrence of a rare disease. As a result, the class imbalance problem has been considered to be of great importance for many years. In this paper, we propose a novel algorithm that utilizes the furthest neighbor of a candidate example to generate new synthetic samples. A key advantage of SOMTEFUNA over existing methods is that it does not have parameters to tune (such as K in SMOTE). Thus, it is significantly easier to utilize in real-world applications. We evaluate the benefit of resampling with SOMTEFUNA against state-of-the-art methods including SMOTE, ADASYN and SWIM using Naive Bayes and Support Vector Machine classifiers. Also, we provide a statistical analysis based on Wilcoxon Signed-rank test to validate the significance of the SMOTEFUNA results. The results indicate that the proposed method is an efficient alternative to the current methods. Specifically, SOMTEFUNA achieves better 5-fold cross validated ROC and precision-recall space performance.

关键词： Binary classification data mining algorithm furthest neighbor imbalance problem SMOTE

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Knowledge discovery from spatial transactions

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JOURNAL OF INTELLIGENT INFORMATION SYSTEMS 2007年第1期28卷 1-22页

作者： Rinzivillo, Salvatore Turini, Franco Univ Pisa Dept Comp Sci Pisa Italy

We propose a general mechanism to represent the spatial transactions in a way that allows the use of the existing data mining methods. Our proposal allows the analyst to exploit the layered structure of geographical information systems in order to define the layers of interest and the relevant spatial relations among them. Given a reference object, it is possible to describe its neighborhood by considering the attribute of the object itself and the objects related by the chosen relations. The resulting spatial transactions may be either considered like "traditional" transactions, by considering only the qualitative spatial relations, or their spatial extension can be exploited during the data mining process. We explore both these cases. First we tackle the problem of classifying a spatial dataset, by taking into account the spatial component of the data to compute the statistical measure (i.e., the entropy) necessary to learn the model. Then, we consider the task of extracting spatial association rules, by focusing on the qualitative representation of the spatial relations. The feasibility of the process has been tested by implementing the proposed method on top of a GIS tool and by analyzing real world data.

关键词： qualitative spatial relations spatial dataset spatial transactions geographical information systems data mining algorithm

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