# Jan Mandel/Blog/2015 Jan Mar

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## Jan 6: SQRT EnKF paper appeared

- Evan Kwiatkowski and Jan Mandel, Convergence of the Square Root Ensemble Kalman Filter in the Large Ensemble Limit, SIAM/ASA Journal on Uncertainty Quantification, 3, 1-17, 2015 Kwiatkowski-2015-CSR doi ucd

## Jan 24: For half, STEM degrees lead to other jobs

- Census Bureau: only 26% of people with any type of four-year STEM degree are working in a STEM field.
- Oversupply of STEM graduates may be already here

A case for transferable skills and quality rather than quantity...

## Jan 27: The NPG discussions paper appeared

- I. Kasanický, J. Mandel, and M. Vejmelka,
*Spectral diagonal ensemble Kalman filters*, Nonlin. Processes Geophys. Discuss., 2, 115-143, 2015 doi:10.5194/npgd-2-115-2015 files

## Feb 2: Clayton Shonkwiler: Geometry of random polygons, knots, and biopolymers

- announcement
- Chikuse, Statistics on Special Manifolds doi:10.1007/978-0-387-21540-2 MR1960435 ucd

## Feb 7: Aime Fournier's patent application for a broad use of wavelets in covariance modeling

## Feb 21: On management

- How to Manage—and Motivate—Challenging Employees
- How To Reduce The Maintenance Of High-Maintenance Employees
- The Myth of the Bell Curve: Human performance follows power law, not gaussian distribution:
*Roughly 10-15% of the population are above the average (often far above the average), a large population are slightly below average, and a small group are far below average. So the concept of "average" becomes meaningless.*summary briefing “The Best & the Rest: Revisiting the Norm of Normality of Individual Performance” Ernest O’Boyle Jr., Herman Aguinis, Personnel Psychology, 2012, 65, 79-119 doi:10.1111/j.1744-6570.2011.01239.x

## Mar 15: Balancing Domain Decomposition Method and Fukushima

*Quick link: http://tinyurl.com/kokpeng*

In invited plenary presentation by Shinobu Yoshimura, *Petascale Finite Element Simulation of Real Worlds Complex Structure with Billions DOFs Model* at the SIAM Conference on Computational Science and Engineering 2015, Salt Lake City

- The balancing domain decomposition method (Mandel, 1993) was used to analyze the damage in the Fukushima Daiichi nuclear disaster by the 2011 Tōhoku earthquake and tsunami.
- The simulations used the K computer, the fastest computers in the world as of June 2011, and up to 10 billion degrees of freedom (that is, equations and unknowns)
- Abstract IP3, SIAM CSE 2015
- Presentation PDF

## Mar 27: Running long jobs from virtual shell

- simple: screen, to detach Control-a d, reattach screen -r
- http://www.howtogeek.com/111417/how-to-multitask-in-the-linux-terminal-3-ways-to-use-multiple-shells-at-once
- http://www.gnu.org/software/screen/manual

## Mar 28: New life of the ks4dvar paper

- original paper arXiv:1304.5271, analysis arXiv:1411.4608 presentations: AMS 2013 PIM13 SIAM UQ 2014
- new paper files
- now called
*Hybrid Levenberg-Marquardt and weak constraint ensemble Kalman smoother method*, by J. Mandel, E. Bergou, S. Gurol, and S. Gratton - to be submitted to Nonlinear Processes in Geophysics