Machine learning based session drop prediction in LTE networks and its SON aspects

Abnormal bearer session release (i.e. bearer session drop) in cellular telecommunication networks may seriously impact the quality of experience of mobile users. The latest mobile technologies enable high granularity real-time reporting of all conditions of individual sessions, which gives rise to use data analytics methods to process and monetize this data for network optimization. One such example for analytics is Machine Learning (ML) to predict session drops well before the end of session. In this paper a novel ML method is presented that is able to predict session drops with higher accuracy than using traditional models. The method is applied and tested on live LTE data offline. The high accuracy predictor can be part of a SON function in order to eliminate the session drops or mitigate their effects. © 2015 IEEE

ProSA - Using the CHASE for Provenance Management

Collecting, storing, tracking, and archiving scientific data is the main task of research data management, being the basis for scientific evaluations. In addition to the evaluation (a complex query in the case of structured databases) and the result itself, the important part of the original database used has also to be archived. To ensure reproducible and replicable research, the evaluation queries can be processed again at a later point in time in order to reproduce the result. Being able to calculate the origin of an evaluation is the main problem in provenance management, particularly in why and how data provenance. We are developing a tool called ProSA which combines data provenance and schema/data evolution using the CHASE for the different database transformations needed. Besides describing the main ideas of ProSA, another focus of this paper is the concrete use of our CHASE tool ChaTEAU for invertible query evaluation

The effect of single large dose hydrocortisone treatment on IgM and IgG antibody production, morphological distribution of antibody producing cells and immunological memory

The effect of a single subcutaneous dose of hydrocortisone (730 mg/kg ∼ 21-day LD(50)) on the haemolysin response of mice to sheep erythrocyte antigen was examined. Hydrocortisone was administered once at times varying from 5 days before immunization with sheep erythrocytes to 9 days after antigen. Total suppression of the 7S haemolysin titre was brought about by treatment with single dose of 750 mg/kg in the period 5 days prior to antigen until 2 days after antigen; at the same time, the titre of 19S haemolysin exceeded the control 19S titre. Microplaque assay on the 5th day failed to confirm total suppression of 7S antibody synthesis, as 4 per cent of the splenic plaque-forming cells produced 7S. The same assay failed to verify the augmentation of 19S production on a cellular level, as the number of 19S plaque-forming was significantly decreased. Hydrocortisone could be shown to influence the morphology of the 19S antibody producing cells by increasing the percentage of mature cell types. A selective depressing activity by hydrocortisone on 7S memory was found. The theoretical implications of these findings are discussed

Economic fluctuations in Central and Eastern Europe: the facts

This article provides a detailed empirical analysis of quarterly frequency dynamics in macroeconomic aggregates in 12 countries of Central and Eastern Europe (CEE). It shows that business fluctuations in CEE countries are, in general, more pronounced than in developed ones, and are of similar size as in other emerging market economies. Private consumption is particularly volatile. Relative to major developed economies government spending is dominantly procyclical, and net exports are strongly countercyclical. The most frequent country outliers are the high inflation countries of Bulgaria, Romania and Russia, especially in labour market, price and exchange rate variables. Excluding these countries from the sample makes many of the observed patterns in cyclical dynamics more homogenous, and broadly similar to ones established in developed economies.