Customer churn prediction in telecom using machine learning and social network analysis in big data platform

Customer churn is a major problem and one of the most important concerns for large companies. Due to the direct effect on the revenues of the companies, especially in the telecom field, companies are seeking to develop means to predict potential customer to churn. Therefore, finding factors that increase customer churn is important to take necessary actions to reduce this churn. The main contribution of our work is to develop a churn prediction model which assists telecom operators to predict customers who are most likely subject to churn. The model developed in this work uses machine learning techniques on big data platform and builds a new way of features' engineering and selection. In order to measure the performance of the model, the Area Under Curve (AUC) standard measure is adopted, and the AUC value obtained is 93.3%. Another main contribution is to use customer social network in the prediction model by extracting Social Network Analysis (SNA) features. The use of SNA enhanced the performance of the model from 84 to 93.3% against AUC standard. The model was prepared and tested through Spark environment by working on a large dataset created by transforming big raw data provided by SyriaTel telecom company. The dataset contained all customers' information over 9 months, and was used to train, test, and evaluate the system at SyriaTel. The model experimented four algorithms: Decision Tree, Random Forest, Gradient Boosted Machine Tree "GBM" and Extreme Gradient Boosting "XGBOOST". However, the best results were obtained by applying XGBOOST algorithm. This algorithm was used for classification in this churn predictive model.Comment: 24 pages, 14 figures. PDF https://rdcu.be/budK

Important Factors on Sidewalks with Vendor Activities Based on Pedestrian Perception by Gender and Age

This paper presents an investigation of important factors relating sidewalk performance based on pedestrian perceptions by gender and age. Exploratory factor analysis technique and reliability test of the variables are performed on 45 items of sidewalk current condition in order to extract dimensions of pedestrian perceptions in Jakarta and Bangkok. Based on age, male respondents reveals that eight factors are identified as important on sidewalk performance, and labeled on the basis of the attributed covered as sidewalk interaction, comfort, space availability, safety, vendor problems, walking path, vendor regulation, and vendor's attraction. On the other hand, the first seven factors are similarly stated by female respondents. Grouped by age, young respondents reveal nine factors are considered important and arbitrarily named as comfort, sidewalk interaction, safety, vendor's attraction, vendor problems, vendor regulation, walking path, space availability, and sidewalk condition. The presence of vendors are often deemed as obstruction for walking flow, but their activities should be accommodated by establishing policies and management to accept high performance of the sidewalks and to support the city's economy

Μελέτη και σχεδιάση αλιευτικούς σκάφους

Εθνικό Μετσόβιο Πολυτεχνείο--Μεταπτυχιακή Εργασία. Διεπιστημονικό-Διατμηματικό Πρόγραμμα Μεταπτυχιακών Σπουδών (Δ.Π.Μ.Σ.) “Ναυτική και Θαλάσσια Τεχνολογία και Επιστήμη

Refugee Entrepreneurship: A Conceptualisation of Key Business Decisions

The various conflicts around the world meant that 2015 has seen the highest refugee figures since World War Two. While some refugees need government support, others are determined to lead an independent life through self-employment (Betts, Bloom and Weaver, 2015; Dijkhuizen and Berkhout 2015; UNHCR 2015). However, we know very little about the economic lives of refugees (Betts, Bloom, Kaplan and Omata 2014), let alone their entrepreneurial activity

Arab SF Film and TV in the Twentieth Century

This article defines the most prominent features and conventions of Arab SF film and television in the twentieth century by examining its narrative, structural, cultural, and production-related conventions. This includes the usage of folk literature and local mythology and certain SF devices, such as advanced medicine. In addition to breaking down the genre\u27s plot devices, the paper looks at its history, its transitions from comedic to serious modes of narrative, and its evolution over the course of the twentieth century

What fear taught me: Resilient communication using art in applied contexts

Narrating my reflections on the quarantine during the COVID-19 pandemic in 2020 and my experience of the crisis in Syria, this paper studies the ways fear can transform into resilience by examining the self-reflexive works Path Out (Karam, 2017) and Another Kind of Girl (Jibawi, 2015). Using digital media, the creators of these works of art construct autobiographical, educational, and interactive narratives about coping and belonging in the course of crisis. I propose viewing both texts as examples of “resilient communication” that reacts to social and cultural issues brought about by crisis and suggests creative solutions that convey optimistic views of the future. Outlining the conventions of resilient communication, in turn, promotes the production of media works that use educational, creative, autobiographical techniques to foster collective resilience

Electrochemical and optical studies on photoactive BiVO4-TiO2/poly 3,4-ethylenedioxythiophene assemblies in gel electrolyte: Role of inorganic/organic interfaces in surface functionalization

Inorganic/organic interface assemblies were created from poly 3,4-ethylenedioxythio­phene (PEDOT) interfaced with amorphous BiVO4 and with BiVO4-TiO2. Electrochemical cells-based thermoplastic gel electrolytes containing KI/I2 were used to study the photoelectrochemical behavior of the Inorganic/organic interface electrodes. Optical studies show that doping BiVO4 with TiO2 narrowed the optical band gap to allow more absorption in the visible region and increases solar energy conversion. Evidence for both direct and indirect band gaps was observed. Refractive index data indicates that BiVO4 and BiVO4/TiO2 obey the anomalous dispassion multiple-oscillator model. Chronoampero­metry of these assemblies shows the phenomena of dark current, which correlates to the presence of random electron/hole generation in the depletion layer. PEDOT enhances the photoactivity of BiVO4 only. Electrochemical impedance spectroscopy studies indicated that both kinetic and diffusional control at high and low frequencies, respectively. Furthermore, studies show that as frequency increases, the conductivity increases due to dispersion and charge carrier hopping. All photoactivity outcomes were reproducible

Teatro del Oprimido

Resumen Este texto tiene dos objetivos. El primero es estudiar la teoría del Teatro del Oprimido de Augusto Boal, y el segundo es analizar las técnicas utilizadas por el grupo teatral para cumplir con la base principal del Teatro del Oprimido. La innovación de este teatro reside en no ser un teatro didáctico convencional cuyo objetivo principal es dirigir al público hacia el prototipo ideal de acuerdo con las normas sociales y políticas. Es un teatro pedagógico en el que todos aprenden, actores y público. De este modo, el principio de la teoría de Augusto Boal es la destrucción de la cuarta pared entre el actor y el espectador para conseguir la transformación social y la promoción de los marginados y los oprimidos; y hasta qué punto lo han conseguido. Para llevar a cabo esto dos objetivos, hemos elegido la obra “Barrios Nómadas” del grupo teatral español, La Rueda: Teatro Social. Esta obra trata el problema de la inmigración ilegal en España, a través de representar el sufrimiento y la opresión de dos jóvenes africanos cuyos destinos son trágicos. El objetivo de esta obra no es catártico, sino que representa al público los mecanismos de la producción de la opresión para que éste ponga las tácticas para evitarla. Palabras claves: Teatro del Oprimido, espect_actor, La Rueda: Teatro Social, Barrios Nómadas. Summary This article has two objectives. The first is to study the theory of the Theatre of Oppressed of Augusto Boal, and the second is to analyze the techniques used by the theatre group, La Rueda: Social Theatre, to fulfill the main basis of this theory. The innovation of the theory of Augusto Boal lies in not being a conventional didactic theatre that aims to direct the audience towards the ideal prototype in accordance with social and political norms. It is a pedagogical theatre where both actors and audience learn. Its main basis is the destruction of the fourth wall between the actor and the spectator in order to achieve social transformation and the promotion of the marginalized and oppressed people. To carry out these two objectives, we have chosen a play of the Spanish theatre group “La Rueda: Social Theatre”, called “Nomadic Neighborhoods”. This play discusses the problem of illegal immigration in Spain, through presenting the suffering and oppression of two young Africans whose destinies are tragic. The objective of this play is not cathartic, it represents to the audience the mechanisms of the production of oppression, so that the audience puts the tactics to avoid it. Key words: Theatre of Oppressed, spect- actor, La Rueda: Social Theatre, Nomadic Neighborhoods