Projects per year

## Personal profile

### External positions

## Fingerprint Dive into the research topics where Yogi Ahmad Erlangga is active. These topic labels come from the works of this person. Together they form a unique fingerprint.

- 1 Similar Profiles

Preconditioner
Mathematics

Helmholtz Equation
Mathematics

Helmholtz equation
Earth & Environmental Sciences

waveforms
Physics & Astronomy

Hermann Von Helmholtz
Mathematics

Helmholtz equations
Physics & Astronomy

Deflation
Mathematics

inversions
Physics & Astronomy

##
Network
Recent external collaboration on country level. Dive into details by clicking on the dots.

## Projects 2018 2020

- 2 Active

### Imaging in Seismic Exploration

Erlangga, Y. A. & Castilla, A. C.

3/20/18 → 12/31/20

Project: Research project

Inverse problems

Imaging techniques

Partial differential equations

Constrained optimization

Acoustic waves

### Finite Element Methods for Dirichlet feedback control problems in chemical reaction engineering

Skrzypacz, P. S., Erlangga, Y. A., Golman, B., Wei, D. & Schieweck, F.

3/20/18 → 12/31/20

Project: Research project

Reaction Engineering

Divergence-free

Chemical Reaction

Feedback Control

Dirichlet

## Research Output 2004 2018

### An iterative multilevel method for computing wavefields in frequency-domain seismic inversion

Erlangga Ahmad, Y. & Herrmann, F. J., Jan 1 2018,*78th Society of Exploration Geophysicists International Exposition and Annual Meeting, SEG 2008.*Society of Exploration Geophysicists, p. 1956-1960 5 p.

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

inversions

linear systems

multigrid methods

factorization

propagation

### Interpolating solutions of the Helmholtz equation with compressed sensing

Lin, T. T. Y., Lebed, E., Erlangga Ahmad, Y. & Herrmann, F. J., Jan 1 2018,*78th Society of Exploration Geophysicists International Exposition and Annual Meeting, SEG 2008.*Society of Exploration Geophysicists, p. 2122-2126 5 p.

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Helmholtz equation

Helmholtz equations

sampling

experiment

method

### On the convergence of two-level Krylov methods for singular symmetric systems

Erlangga, Y. A. & Nabben, R., Dec 1 2017, In : Numerical Linear Algebra with Applications. 24, 6, e2108.Research output: Contribution to journal › Article

Two-level Method

Krylov Methods

Linear systems

Minimal Residual Method

Multilevel Methods

12
Citations
(Scopus)

### Iterative schemes for high order compact discretizations to the exterior Helmholtz equation

Erlangga, Y. & Turkel, E., May 2012, In : ESAIM: Mathematical Modelling and Numerical Analysis. 46, 3, p. 647-660 14 p.Research output: Contribution to journal › Article

Helmholtz equation

Helmholtz Equation

Iterative Scheme

Preconditioner

Discretization

13
Citations
(Scopus)

### Algebraic multilevel Krylov methods

Erlangga, Y. A. & Nabben, R., 2009, In : SIAM Journal on Scientific Computing. 31, 5, p. 3417-3437 21 p.Research output: Contribution to journal › Article

Krylov Methods

Multilevel Methods

Algebraic multigrid Method

Transfer Operator

Helmholtz equation