For a measurement matrix in compressed sensing, its spark (or the smallest number of columns that are linearly dependent) is an important performance parameter. The matrix with spark greater than 2k guarantees the exact recovery of ksparse signals under an l0-optimization, and the one with large spark may perform well under approximate algorithms of the l0-optimization. Recently, Dimakis, Smara...

Apache spark, famously known for big data handling ability, is a distributed open-source framework that utilizes the idea of memory to process data. As performance spark mostly being affected by predominant configuration parameters, it challenging achieve optimal result from spark. The current practice tuning parameters ineffective, as performed manually. Manual large space and complex interact...

The initial 1-2 minutes of operation of an automotive spark-ignition engine, commonly called as the ”coldstart” period, produces more than 75-80 % of the hydrocarbon (HC) emissions in a typical drive cycle. Model-based controller development requires accurate, yet simple, models that can run in realtime. Simple, intuitive models are developed to predict both tailpipe hydrocarbon (HC) emissions ...

We investigate the NP-hard problem of computing the spark of a matrix (i.e., the smallest number of linearly dependent columns), a key parameter in compressed sensing and sparse signal recovery. To that end, we identify polynomially solvable special cases, gather upper and lower bounding procedures, and propose several exact (mixed-)integer programming models and linear programming heuristics. ...

Big Data Cyber Security Analytics (BDCA) systems use big data technologies (e.g., Apache Spark) to collect, store, and analyse a large volume of security event for detecting cyber-attacks. The digital in general specific is increasing exponentially. velocity with which generated fed into BDCA system unpredictable. Therefore, should be highly scalable deal the unpredictable increase/decrease dat...

The ITEP-PNPI collaboration presents the results of the measurements of the spin rotation parameter A in the elastic scattering of positive and negative pions on protons at Pbeam = 1.62 GeV/c. The setup included a longitudinally-polarized proton target with superconductive magnet, multiwire spark chambers and a carbon polarimeter with thick filter. Results are compared to the predictions of par...

Temperature is one of the effective parameters in erosion of spark plug electrodes. In this research, temperature of spark plug was measured in engine's different operation conditions with two types of fuels: compressed natural gas and gasoline. Test results showed that, temperature of center electrode is lower than ground electrode and maximum difference between them is 110ºC that occurs at...