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- Ha Quy Nguyen, Vivek K. Goyal, Lav R. Varshney
- 2010 44th Annual Conference on Information…
- 2010

Frame permutation quantization (FPQ) is a new vector quantization technique using finite frames. In FPQ, a vector is encoded using a permutation source code to quantize its frame expansion. This means that the encoding is a partial ordering of the frame expansion coefficients. Compared to ordinary permutation source coding, FPQ produces a greater number of… (More)

- D Gunnarsson, J S Richardson-Bullock, +8 authors M Prunnila
- Scientific reports
- 2015

The control of electronic and thermal transport through material interfaces is crucial for numerous micro and nanoelectronics applications and quantum devices. Here we report on the engineering of the electro-thermal properties of semiconductor-superconductor (Sm-S) electronic cooler junctions by a nanoscale insulating tunnel barrier introduced between the… (More)

- Ha Quy Nguyen, Vivek K. Goyal, Lav R. Varshney
- 2009 IEEE International Symposium on Information…
- 2009

Permutation codes are a class of structured vector quantizers with a computationally-simple encoding procedure. In this paper, we provide an extension that preserves the computational simplicity but yields improved operational rate-distortion performance. The new class of vector quantizers has a codebook comprising several permutation codes as subcodes.… (More)

- Ha Quy Nguyen, Lav R. Varshney, Vivek K. Goyal
- IEEE Trans. Communications
- 2010

Permutation codes are a class of structured vector quantizers with a computationally-simple encoding procedure based on sorting the scalar components. Using a codebook comprising several permutation codes as subcodes preserves the simplicity of encoding while increasing the number of rate–distortion operating points, improving the convex hull of operating… (More)

- H. Q. Nguyen, V. V. Chupin, +5 authors V. I. Shvets
- Doklady Biochemistry and Biophysics
- 2015

This work is devoted to the study and obtaining of new radioprotective agents based on natural flavonoid genistein and spherical amorphous nanoparticles (SANPs) produced from a mixture of birch bark triterpenoids. The physicochemical characteristics of the nanoparticles were studied by electron microscopy, dynamic light scattering, and UV-VIS spectroscopy.… (More)

- Ha Q. Nguyen
- 2011

This report provides an expository summary of the proof of optimal shearlet approximation (compact support case). We only discuss the non-smooth part of the approximation. For further details, the readers are referred to [1], [2] and the references therein. I. COMPACTLY SUPPORTED SHEARLET FRAME A. Some Notations • parabolic scaling matrices: A2j = 2j 0 0… (More)

- Ha Q. Nguyen
- 2011

Deterministic approach for error analysis for depth image-based rendering. I. PROBLEM STATEMENT In this report, we adopt the problem setup and almost all notations from [1]. We only consider the unoccluded 2-D image-based rendering using propagation algorithm. The following notation will be used frequently in this report. Definition 1: For a finite set S =… (More)

Quantized frame expansions are overcomplete representations of signals approximated by some quantizer. This scheme proved to be a very useful tool to combat quantization noise and erasures. Normally, a scalar quantizer is used in the quantization phase. In this paper we investigate the use of permutation codes, a beautiful source coding technique, as a… (More)

- Ha Q. Nguyen
- 2012

As a generalization of the subspace fitting, the union of subspaces fitting problem consists in finding an union of subspaces in some given family that best fits to the finite data. This report provides a detailed review of the main reference [4] about the existence of such optimal solution. Proofs for a series of unproved statements in the reference are… (More)

Permutation source codes are a class of structured vector quantizers with a computationally-simple encoding procedure. In this thesis, we provide two extensions that preserve the computational simplicity but yield improved operational rate–distortion performance. In the first approach, the new class of vector quantizers has a codebook comprising several… (More)