XGBOD: Improving Supervised Outlier Detection with Unsupervised Representation Learning

A new semi-supervised ensemble algorithm called XGBOD (Extreme Gradient Boosting Outlier Detection) is proposed, described and demonstrated for the enhanced detection of outliers from normal observations in various practical datasets. The proposed framework combines the strengths of both supervised and unsupervised machine learning methods by creating a hybrid approach that exploits each of their individual performance capabilities in outlier detection. XGBOD uses multiple unsupervised outlier mining algorithms to extract useful representations from the underlying data that augment the predictive capabilities of an embedded supervised classifier on an improved feature space. The novel approach is shown to provide superior performance in comparison to competing individual detectors, the full ensemble and two existing representation learning based algorithms across seven outlier datasets.Comment: Proceedings of the 2018 International Joint Conference on Neural Networks (IJCNN

Robustness of support structures for offshore wind turbines - Dynamics, fatigue damage and extreme loads with a damaged foundation

Abstract This master thesis considers the strength analysis of the offshore wind turbine s jacket support structure with one structural member damaged or weakened, not capable of transferring the loads. A wind turbine and its substructure are usually exposed to environmental loadings (i.e. wind, waves) and described by computer simulations. FEDEM Windpower environment is used to analyse the model of the offshore wind turbine. Firstly, the thesis is to indicate the areas of the largest fatigue damage accumulation in the remaining structure members and to estimate their ultimate strength. The fatigue evaluation of the steel structure elements is based on the Palmgren-Miner linear damage hypothesis. The steel brace member damage has been modelled by reducing the elastic modulus (Young's modulus) or inserting a free-joint mechanism in the middle of the element. Then the results of structure strength calculations before and after damage are collected and compared. Secondly, the analysis assumes a reduction in the fatigue loads applied to the support structure by changing the wind turbine control system. These changes are aimed at decreasing mainly the rotor revolution frequency and generator torque at the same time. The adjustment is achieved by varying a turbine blade pitch. The controller has also been modified to avoid continuous turbine operation at frequencies close to resonance

LSCP: Locally Selective Combination in Parallel Outlier Ensembles

In unsupervised outlier ensembles, the absence of ground truth makes the combination of base outlier detectors a challenging task. Specifically, existing parallel outlier ensembles lack a reliable way of selecting competent base detectors, affecting accuracy and stability, during model combination. In this paper, we propose a framework---called Locally Selective Combination in Parallel Outlier Ensembles (LSCP)---which addresses the issue by defining a local region around a test instance using the consensus of its nearest neighbors in randomly selected feature subspaces. The top-performing base detectors in this local region are selected and combined as the model's final output. Four variants of the LSCP framework are compared with seven widely used parallel frameworks. Experimental results demonstrate that one of these variants, LSCP_AOM, consistently outperforms baselines on the majority of twenty real-world datasets.Comment: Proceedings of the 2019 SIAM International Conference on Data Mining (SDM

FORMS OF COOPERATION OF MEDIUM VOCATIONAL SCHOOLS WITH THE LOCAL ENVIRONMENT, AND THE QUALITY OF EDUCATION BASED ON THE EXAMPLE OF THE ZIEMIA PODLASKA SCHOOL COMPLEX NO. 4 IN BIELSK PODLASKI

Subject and purpose of work: The subject of the study is the cooperation of secondary vocational schools (technical secondary schools) with institutions of the local environment and its impact on the improvement of the quality of education. The aim of the work is to identify the main results of the school's cooperation with its immediate environment. An important element of the analysis is to find answers to several problematic questions, such as: What institutions and organizations do vocational schools cooperate with? What activities are undertaken in cooperation with institutions and organizations? What educational benefits do school students get from cooperation? Materials and methods: The article uses a diagnostic survey method, an observation method, an inductive-deductive method, an interview and a literature review. The survey conducted among students and teachers of a selected secondary school made it possible to obtain information on the forms of cooperation with the local community and its impact on the processes taking place at school, in particular on the didactic and educational process. Results: The school teaching staff members see the need for active cooperation with the local community because entities from the school's environment can complement the didactic and educational activities. Therefore, numerous and varied forms of cooperation are undertaken, which, in the opinion of students, bring many benefits related to extending knowledge, improving professional skills and social competences. Conclusions: The cooperation of the school with the local community leads to the improvement of the quality of education, both in the area of didactics and education, as well as modernization of the didactic base and promotion of the school. It is advisable to consciously shape the cooperation by the school management

Forms of cooperation of medium vocational schools with the local environment, and the quality of education based on the example of the Ziemia Podlaska School Complex No. 4 in Bielsk Podlaski / Formy współpracy średnich szkół zawodowych ze środowiskiem lokalnym a jakość kształcenia na przykładzie Zespołu Szkół nr 4 im. Ziemi Podlaskiej w Bielsku Podlaskim

Subject and purpose of work: The subject of the study is the cooperation of secondary vocational schools (technical secondary schools) with institutions of the local environment and its impact on the improvement of the quality of education. The aim of the work is to identify the main results of the school's cooperation with its immediate environment. An important element of the analysis is to find answers to several problematic questions, such as: What institutions and organizations do vocational schools cooperate with? What activities are undertaken in cooperation with institutions and organizations? What educational benefits do school students get from cooperation? Materials and methods: The article uses a diagnostic survey method, an observation method, an inductive-deductive method, an interview and a literature review. The survey conducted among students and teachers of a selected secondary school made it possible to obtain information on the forms of cooperation with the local community and its impact on the processes taking place at school, in particular on the didactic and educational process. Results: The school teaching staff members see the need for active cooperation with the local community because entities from the school's environment can complement the didactic and educational activities. Therefore, numerous and varied forms of cooperation are undertaken, which, in the opinion of students, bring many benefits related to extending knowledge, improving professional skills and social competences. Conclusions: The cooperation of the school with the local community leads to the improvement of the quality of education, both in the area of didactics and education, as well as modernization of the didactic base and promotion of the school. It is advisable to consciously shape the cooperation by the school management.Przedmiot i cel pracy: Przedmiotem opracowania jest współpraca średniej szkoły zawodowej (technikum) z instytucjami środowiska lokalnego oraz jej wpływ na doskonalenie jakości kształcenia. Praca ma na celu identyfikację głównych rezultatów współpracy szkoły z jej najbliższym otoczeniem. Ważnym elementem analizy jest znalezienie odpowiedzi na kilka problemowych pytań, takich jak: z jakimi instytucjami i organizacjami współpracują szkoły zawodowe?, jakie działania są podejmowane we współpracy z instytucjami i organizacjami? oraz jakie korzyści edukacyjne osiągają ze współpracy uczniowie szkół? Materiały i metody: W artykule zastosowano metodę sondażu diagnostycznego, metodę obserwacji, indukcyjno-dedukcyjną, wywiad oraz przegląd literatury. Przeprowadzone badania ankietowe wśród uczniów i nauczycieli wybranej szkoły średniej dały możliwość pozyskania informacji na temat podejmowanych form współpracy ze środowiskiem lokalnym oraz jej wpływu na zachodzące w szkole procesy, w szczególności na proces dydaktyczno-wychowawczy. Wyniki: Kadra pedagogiczna szkoły widzi potrzebę aktywnej współpracy ze środowiskiem lokalnym, ponieważ podmioty z otoczenia szkoły mogą uzupełnić działalność dydaktyczno-wychowawczą. Dlatego podejmowane są liczne i różnorodne formy współdziałania, które w ocenie uczniów przynoszą liczne korzyści związane z pogłębianiem wiedzy, doskonaleniem umiejętności zawodowych i kompetencji społecznych. Wnioski: Współpraca szkoły ze środowiskiem lokalnym prowadzi do poprawy jakości kształcenia, zarówno w obszarze dydaktyki i wychowania, jak również unowocześnienia bazy dydaktycznej oraz promocji szkoły. Wskazane jest świadome kształtowanie współpracy przez kierownictwo szkoły

Cultural situation in Silesia at the turn of Hallstatt and La Tène period

Celem niniejszej pracy jest podsumowanie aktualnej wiedzy o Śląsku na przełomie okresów halsztackiego i lateńskiego, ze szczególnym względnieniem kultury łużyckiej. Ramy terytorialne obejmują obszar Śląska, w tym Śląska Górnego, Środkowego i Dolnego, wraz z przyległymi terenami północno-wschodnich Czech i północnych Moraw. Chronologia omawianych zjawisk zawiera się pomiędzy okresem Ha C i początkiem okresu Lt B. Jako wprowadzenie do tematu omówiony został fenomen grupy śląskiej kultury łużyckiej i przyczyny jej kryzysu. Następnie analizie poddano importy i miejscowe naśladownictwa inspirowane stylistyką zachodniohalsztacką i wczesnolateńską. W następnej kolejności omówiono stanowiska archeologiczne związane z późną fazą kultury łużyckiej. Zarysowane zostały także zagadnienia związane z osadnictwem kultury pomorskiej, jak również wpływami celtyckimi na Śląsku. Na podstawie najnowszych opracowań uaktualniono chronologię absolutną omawianych problemów.The purpose of this thesis is to summarize the current state of knowledge about Silesia at the turn of Hallstatt and La Tène period, in particular Lusatian culture. The analysis encompasses the area of Silesia, including Upper, Middle and Lower Silesia, with adjoining territories of north-eastern Bohemia and northern Moravia. The chronology of discussed phenomena is contained between Hallstatt C phase and the beginning of La Tène B phase. The introduction discusses the phenomenon of the Silesian group of Lusatian culture and the causes of its crisis. The following chapters provide an analysis of importations and local products inspired by the West-Halltstatt and early La Tène style. Archeological sites related to the late phase of Lusatian culture are presented next. An outline of Pomeranian culture and Celtic influences in the area of Silesia is also provided. The absolute chronology of the problems in question has been updated on the basis of the most recent research

The Creek Treaty at Washington, 1826

The treaty with the Creek Indian Nation made in the city of Washington on January 24, 1826, is an important event in the history of United States government-Indian relations, in the history of the state of Georgia, and in the history of the Creek Nation. The period from 1824 to 1828 was truly a time of trouble and hardship for all parties concerned: for Georgia, who was anxious to see her western lands cleared of Indian title; for the Creeks, who were desperately trying to hold on to their ancestral homes; and for the federal government, which was faced with the task of trying simultaneously to satisfy both Georgia and the Indians as well as to protect the common good of the nation. In order to realize the significance of the treaty, an understanding of the events that led up to it is essential

FORMS OF COOPERATION OF MEDIUM VOCATIONAL SCHOOLS WITH THE LOCAL ENVIRONMENT, AND THE QUALITY OF EDUCATION BASED ON THE EXAMPLE OF THE ZIEMIA PODLASKA SCHOOL COMPLEX NO. 4 IN BIELSK PODLASKI

Subject and purpose of work: The subject of the study is the cooperation of secondary vocational schools (technical secondary schools) with institutions of the local environment and its impact on the improvement of the quality of education. The aim of the work is to identify the main results of the school's cooperation with its immediate environment. An important element of the analysis is to find answers to several problematic questions, such as: What institutions and organizations do vocational schools cooperate with? What activities are undertaken in cooperation with institutions and organizations? What educational benefits do school students get from cooperation? Materials and methods: The article uses a diagnostic survey method, an observation method, an inductive-deductive method, an interview and a literature review. The survey conducted among students and teachers of a selected secondary school made it possible to obtain information on the forms of cooperation with the local community and its impact on the processes taking place at school, in particular on the didactic and educational process. Results: The school teaching staff members see the need for active cooperation with the local community because entities from the school's environment can complement the didactic and educational activities. Therefore, numerous and varied forms of cooperation are undertaken, which, in the opinion of students, bring many benefits related to extending knowledge, improving professional skills and social competences. Conclusions: The cooperation of the school with the local community leads to the improvement of the quality of education, both in the area of didactics and education, as well as modernization of the didactic base and promotion of the school. It is advisable to consciously shape the cooperation by the school management

Robustness of support structures for offshore wind turbines - Dynamics, fatigue damage and extreme loads with a damaged foundation

Abstract This master thesis considers the strength analysis of the offshore wind turbine s jacket support structure with one structural member damaged or weakened, not capable of transferring the loads. A wind turbine and its substructure are usually exposed to environmental loadings (i.e. wind, waves) and described by computer simulations. FEDEM Windpower environment is used to analyse the model of the offshore wind turbine. Firstly, the thesis is to indicate the areas of the largest fatigue damage accumulation in the remaining structure members and to estimate their ultimate strength. The fatigue evaluation of the steel structure elements is based on the Palmgren-Miner linear damage hypothesis. The steel brace member damage has been modelled by reducing the elastic modulus (Young's modulus) or inserting a free-joint mechanism in the middle of the element. Then the results of structure strength calculations before and after damage are collected and compared. Secondly, the analysis assumes a reduction in the fatigue loads applied to the support structure by changing the wind turbine control system. These changes are aimed at decreasing mainly the rotor revolution frequency and generator torque at the same time. The adjustment is achieved by varying a turbine blade pitch. The controller has also been modified to avoid continuous turbine operation at frequencies close to resonance