A Comparative Study of Predicting Customer Churn and Lifetime

The problem to be investigated in this research is that of predicting customers who are at risk of leaving the company, a term called churn prediction in telecommunication. The aim of this research is to predict customer churn and further focus on creating customer lifetime profiles. These profiles will allow the company to fit their customer base into n categories and make a long estimation on when a customer is potentially going to terminate their service with the company. The research then proceeds to provide a comparative analysis of neural networks and survival analysis in their capabilities of predicting customer churn and lifetime. . Key words: GSM networks, Base station, Mobile station, Signal strength, GSM service provider

IMPLEMENTASI ALGORITMA FLOYD WARSHALL PADA APLIKASI PENGADUAN MASYARAKAT BERBASIS ANDROID

Public complaints are complaints from the public, Government Agencies or other parties verbally or in writing containing information, complaints, dissatisfaction or irregularities in the performance of the National Police that require further handling and settlement. In conducting complaints, the community usually uses short messages (sms) or telephone so that the community must have a personal contact number of the police member who can be contacted. To make it easier for the public to make complaints, a complaint application is needed to find out the policeman to be contacted. Application that will be developed based on preliminary research that took place at Kuningan Police Station. Mobile-based applications that are needed a lot in searching for police and the location of traffic accidents and providing a description of pastoral events. The application that is created only shows the location of the accident in Kuningan Regency. In finding the nearest route, it will be displayed in the form of maps. The police can choose directions from the details of the complaint, then the system will display the results in the form of a route on maps. In this application there is also a service to find out the location of the community by using GPS technology. And the author uses the Floyd Warshall algorithm to determine the nearest police station and determine the route from the location of the police station to the scene. As well as in storing data in this application the author uses MySQL or phpMyAdmin as a web server in storing event data and police data, notifications and reports concerned with the complaint application. And in the development of this application is based on client-server.Keywords: Floyd Warshall Algorithm, GPS, Kuningan Regency, Mobile, MySQL, Police station, phpMyAdmin, Web Server, Community

Tajność głosowania w prawie wyborczym wybranych państw Europy Środkowej

The article describes Polish, Czech and Lithuanian regulations on secret ballot, with a particular emphasis on the functionality and technical aspects of its execution. The two main methods of voting subjected to research are voting at polling station and postal voting, with some references to other alternative voting methods (proxy voting, mobile polling station, mobile ballot box) as well. Statutory provisions are at some point confronted with the views of legal doctrine and international regulations on the matter. Appearing across the whole work are considerations on the legal status of the secret ballot rule for individuals, whether it is an obligation or a right. The part devoted to Polish law also contains a commentary on changes to Polish Electoral Code in force from years 2016–2018.