Aree Witoelar


				Aree Witoelar

Technical

Publication

Learning Vector Quantization: generalization ability and dynamics of competing prototypes
A. Witoelar, M. Biehl, B. Hammer
Proc. WSOM 2007, in press (2007)
Proceedings (.pdf)

On the Dynamics of Vector Quantization and Neural Gas
A. Witoelar, M. Biehl, A. Ghosh, B. Hammer
In M. Verleysen, editor, Proc. of European Symposium on Neural Networks (ESANN) 2007, d-side, Evere, Belgium, 127-132, 2007 (2007)
Proceedings (.pdf) Poster (.pdf)

Poster

Dynamics of Multiple Prototype LVQ
A. Witoelar, M. Biehl, A. Ghosh
Scientific ICT Research Event The Netherlands (SIREN) 2006
Poster (.pdf, 300 kB)

Learning from examples in neural gas and vector quantization
M. Biehl, A. Ghosh, A. Witoelar
DPG Frühjahrstagung 2006, Dresden
Poster (.pdf, 300 kB)

Msc. in Physics Courses

Visualization of Dislocations in a 3-D Nanoindentation Simulation
Master's Thesis, RUG, supervised by Prof dr. H. de Raedt
One crystal imperfection is the line defect, or dislocation. We investigate dislocations in crystals in a nanoindentation simulation on an iron (Fe) system with FCC structure using the Lennard-Jones potential (LJ) and Lennard-Jones Spline potential with the Embedded Atom Method (LJS-EAM). Dislocation loops are observed during indentation indicating stacking faults caused by partial dislocations. Comparisons show that LJS-EAM produces deeper dislocation loops into the system.
Presentation (.ppt, 2.4 MB) | Report (.pdf, 1.3 MB)

Simulation of Nuclear Magnetic Resonance Two-Qubit Quantum Computer
Nuclear Magnetic Resonance (NMR) uses interaction of magnetic field and the magnetic moments of nuclei. We simulate a CNOT gate using NMR.
Report (.pdf, 520 kB)

Neutron Stars
Neutron stars are collapsed core of massive stars. Being composed entirely from neutron, it is interesting from a standpoint of nuclear physics. The Neutron Star radius can be approximated with Binding Energy, Fermi Gas model, or Nucleon-Nucleon interaction.
Presentation (.ppt)

Diffusion Using Product Formula
The diffusion equation may be solved using the Product Formula algorithm where the evolution matrix is decomposed into two simpler matrices.
Report (.pdf, 743 kB) | Program 1-D (.exe, 275 kB) | Program 2-D (.exe, 878 kB)

Bsc. in Engineering Physics Courses

Simulasi Dinamika Molekul
Bachelor's Thesis, ITB, supervised by dr. H. Dipojono
Simulasi Dinamika Molekul (MDS) adalah teknik simulasi komputer yang mengamati pergerakan molekul-molekul yang saling berinteraksi. Dari molekul-molekul ini, dapat diperoleh sifat material yang diamati. Berdasarkan itu, maka dirancang MDS untuk sistem terisolasi (ensemble mikrokanonikal) dan sistem dengan pengendalian temperatur (ensemble kanonikal).
Report (.pdf, 1.5 MB) | Program (.zip, 334 kB)

Migrasi Menuju Jaringan Akses Broadband
(.pdf, 800 kB)

Paul Feyerabend