Abstract We present radio and optical afterglow observations of the TeV-bright long Gamma Ray Burst (GRB) 190114C at a redshift z = 0.425, which was detected by MAGIC telescope. Our with ALMA, ATCA, uGMRT were obtained our low frequency observing campaign range from ∼1 to ∼140 days after burst done three telescopes spanning up ∼25 burst. Long term radio/mm reveal complex nature afterglow, does ...

Data warehouse views typically store large aggregate tables based on a subset of dimension attributes of the main data warehouse fact table. Aggregate views can be stored as 2n subviews of a data cube with n attributes. Methods have been proposed for selecting only some of the data cube views to materialize in order to speed up query response time, accommodate storage space constraint and reduc...

To fulfill the requirement of fast interactive multidimensional data analysis, database systems precompute aggregate views on some subsets of dimensions and their corresponding hierarchies. However, the problem of what to precompute is difficult and intriguing. The leading existing algorithm, BPUS, has a running time that is polynomial in the number of views and is guaranteed to be within (0.63...

For how long will a recommendation model provide adequate recommendations? The answer to this question depends on the kind of model, its underlying data, and the domain among other factors. We analyse four types of models in the news domain on how their predictive performances change. Our observations show that replacing or updating models is necessary to maintain high predictive performance. T...

We propose a dynamic vehicular routing algorithm with traffic prediction for improved routing performance. The primary idea of our algorithm is to use real-time as well as predictive traffic information provided by a central routing controller. In order to evaluate the performance, we develop a microtraffic simulator that provides road networks created from real maps, routing algorithms, and ve...

A generalization of Allen’s interval-based approach to temporal reasoning is presented. The notion of ‘conceptual neighborhood’ of qualitative relations between events is central to the presented approach. Relations between semi-intervals rather than intervals are used as the basic units of knowledge. Semi-intervals correspond to temporal beginnings or endings of events. We demonstrate the adva...