ISSN 1312-2622

YEAR X No. 3 / 2012

CONTENTS

A Study of a New Class of Congruential Generators for Monte Carlo Methods
Ultrasound Computer Assisted Screening for Early Diagnosis of Prostate Cancer
Unlocking the Next Level of Crime Prevention: Development of a Game Prototype to Teach the Conjuction of Criminal Opportunity
Fast Transient Detection and Processing Algorithms for Time Scaling of Audio Files via a Rigid Phase-locked Vocoder
Performance Evaluation of Heterogeneous Microprocessor Architectures

 

A Study of a New Class of Congruential Generators for Monte Carlo Methods
T. Gurov, S. Ivanovska, A. Karaivanova, N. Manev
Key Words:
Monte Carlo methods; Pseudo Random Number Generators; Multidimensional integratio; Integral equations.
Abstract:
In this paper we propose a new class of congruential pseudo random number generators based on sequences generating permutations and study Monte Carlo numerical methods for solving multidimensional integrals and integral equations based on them. These sequences have been developed for other applications but our analysis and experiments show that they are appropriate for aproximation of multiple integrals and integral equations.

Ultrasound Computer Assisted Screening for Early Diagnosis of Prostate Cancer
P. Dimitrov, D. Ormanov, P. Panchev, V. Behar, P. Konstantinova, K. Alexiev
Key Words:
Computer assisted screening; Ultrasound imaging; Image processing; Parallel algorithms.
Abstract:
The main goal of the tool proposed in this paper is diagnostic quality enhancement by improving the images of the ultrasound scan using parallel computer processing. Many advanced algorithms for speckle noise filtering, image segmentation and texture analysis are implemented and coded to run in parallel. The physician receives several output images with outlined regions where different anomalies were detected. The coincidence of the regions indicates higher probability of prostate cancer. This will contribute for earlier diagnose of "smaller", clinically insignificant, or even "obscured" prostate lesions and provides visual reassurance for treatment decision-making process.

Unlocking the Next Level of Crime Prevention: Development of a Game Prototype to Teach the Conjuction of Criminal Opportunity
M. Ruskov, J. M. Celdran, P. Ekblom, M. A. Sasse
Key Words:
Serious game; rapid prototyping; formative evaluation; conjunction of criminal opportunity.
Abstract:
This paper reports on a case study of using rapid prototyping to develop a serious game about crime prevention. Five small-scale formative evaluations (with a total of 17 participants) were used to guide the collect user requirements and formative feedback. Early formative results are positive and provided early signals on what needs to be changed in the game design and what could be kept. Evaluations also provided valuable feedback for the underlying subject matter theory. The process used in this research could possibly be transferred and adopted in other serious game development projects, resulting in low-cost development and early feedback on game design ideas.

Fast Transient Detection and Processing Algorithms for Time Scaling of Audio Files via a Rigid Phase-locked Vocoder
L. Gueorguieff
Key Words:
Audio time-scaling; rigid phase-locked vocoder; transient smearing; real-time; digital signal processing.
Abstract:
This paper describes algorithms for transient detection and processing applicable for audio time scaling via a rigid phaselocked vocoder in the frequency domain. These algorithms fix an inherent problem of the phase vocoder - the transient smearing. Results of comparative and listening tests, and several methods to assess the quality-to-processing-time ratio are shown. A phase vocoder using these algorithms has the highest value of such ratio and operates in real-time on today's least powerful 32-bit microprocessors.

Performance Evaluation of Heterogeneous Microprocessor Architectures
G. Dimova, M. Marinova, V. Lazarov
Abstract:
This paper focuses on the evaluation of the performance of heterogeneous microprocessor architectures using user and system perspective metrics. The tests have been conducted using a new simulation technique - Interval simulation, and a computer architecture simulator which is based on this technique. The evaluation is done by using the benchmarks included in the two most popular free benchmark suites available - PARSEC, developed and maintained by Princeton University, and SPLASH2 - developed and maintained by the University of Stanford.

The John Atanasoff Society of Automatics and Informatics

[Home ]   [Current]  [Editorial Board]  [Author Guidelines]   [Archives ]
  [Contact us]