Dominika Jurovatá

Simulation of Photon Propagation in Tissue Using Matlab

Abstract This paper deals with the light transport, photon trajectory and its radiation in tissue. A model based on Monte Carlo simulation has been implemented in Matlab to get inside into photon interaction with tissue. The project is aimed to non-invasive pulse oximetry measurement of fetal oxygen saturation in the maternal abdomen. One of the fundamental challenges is to ensure a sufficient penetration depth which covers maternal and fetal tissue. This contribution investigates the photon trajectories and analyse the number of photons which stayed in tissue and their radiation distribution. The principle and photon propagation rules, needed for simulation, are presented in this article. Finally the results are compared with literature.

The Evaluation of Priority Rules in Operations Scheduling

The main objective of the project was to investigate the influence of the selected priority rules of technological operations on chosen production goals. The paper presents the results of the project. The dynamic scheduling process of operations was simulated on the model of production system. The effect of each priority rule has been studied for different production goals in different stressful situations. The synthesis and the evaluation of results were performed by using mathematical and statistical methods. The multi-objective evaluations scoring method have been chosen by authors.

Prediction of Selected Production Goals by Classification Methods

The goal of this work was to use the process of knowledge discovery in planning and control of production processes. This work is focused on the prediction of the system behavior from the data of production process. The classification was used as a task of data mining. Some predictive models were created and the predictions of the production process behavior were realized by varying the input parameters using selected methods and techniques of data mining. It can be confirmed that the selected input parameters will lead to the fulfillment of the declared objectives of the process. The process of knowledge discovery has been implemented in the program STATISTICA Data Miner.

The impact of reducing setup costs on the lot size and objectives of manufacturing

This paper points out the significance of setup costs reduction on the decrease of lot size. The authors demonstrate this phenomenon on a flexible manufacturing system simulation model. The research focus was to fully understand the relationships between the lot size and setup costs. The aim of research was to show an impact of lot size on the selected manufacturing objectives. For each series of experiments, the setup costs were continuously reduced, and then the optimal lot size was determined by simulation optimization. The procedure for lot size determination was proposed by the authors and is based on a simulation optimization method. The authors have expressed their hypothesis of the positive impact of the optimal lot size on the objective parameters fulfilment of a manufacturing system, especially the minimization of costs per unit, throughput time and work in progress and the maximization of number of finished products and machine utilization. The hypothesis was confirmed by the gained simulation experiment results.

Physics & geometry: An unique optics for introductory dynamical systems knowledge

There are many fields of communication where a certain words - technical terms - occur in a courses of technological university study. In this note we give a few areas of a) appearing 3-dimensional 2-parametric geometric object anuloid, named also toroid, b) using of synograph meanings - in a software engineering, linguistics, medicine, mainly in geometry/physics interdisciplinary fields, where planar coordinate systems, kinematic curves and dynamical systems are of a leading role. This approach is - on the authors best known - unfamiliar in a literature and offers useful domains of next recognition. The modest aim of our consideration is to show a) links joining the tori mathematics with diverse applications of scientific fields, especially with robot motion planning, the area important for technological university students, majoring in automation; and b) connexions of the word synograph with the dynamical systems area.

Modelling the Traffic System

Abstract The paper presents the simulation study results of the traffic system in the city of Hlohovec. The authors describe the process of building the model in Witness 2013c simulator. The individual entities of simulation model are explained in details, as the Witness simulator is primarily suitable for manufacture or service simulation and not for traffic system simulation. The goal of this paper is to analyse the traffic system and to suggest the changes for improving the traffic in the city of Hlohovec. All proposed measures will bring about 20% improvement of traffic when compared to the current state.

Retracted: Matlab Simulation of Photon Propagation in Three-Layer Tissue

This paper deals with the simulation of photon propagation in the maternal abdomen. Authors focused on the light transport, photon trajectory and their radiation in three-layer tissue. The main aim of this study is to observe the behaviour of photon in three-layer tissue. A simulation model has been implemented in Matlab. The photon interaction with tissue was observed. This model was realized for the project aimed to non-invasive pulse oximetry measurement of fetal oxygen saturation in the maternal abdomen. One of the fundamental challenges is to ensure a sufficient penetration depth which covers maternal and fetal tissue. This contribution investigates the photon trajectories and compares the results of specular reflectance, diffuse reflectance, absorbed fraction and transmittance in three-layer tissue with regard to the thickness of the third layer. Simulations have been performed at three depths fetal (2.5, 3.7, 4.9 cm).

Input Control in Production System by Simulation Optimization

The paper deals with the problem of simulation optimization and presents its usage for input control in a production system. The paper gives an overview of typical concepts of input control. Authors propose different approaches. The basic principles of simulation optimization are explained. A general procedure with each step is defined and this procedure is explained by an example. The solution is focused on the minimization of the production costs, which is included in the objective function. Realization of the simulation optimization is based on the combination of three different algorithms: Adaptive Thermostatistical Simulated Annealing, Random Solution and All Combination algorithm. The proposed procedure definitely leads to exact determination of input interval for given production system and short time period.

Analysis of Production Process Parameters by Using Data Mining Methods

This article deals with knowledge discovery in databases (abbr. KDD) and methodology of this process. The authors give an identification of production parameters and their influence on a production process. Knowledge discovery in the production databases is minimally used for the process of planning and control. There are many problems that occur in the production process. It is important to indentify the impact of manufacturing parameters on the system for managers. New discovered knowledge from production systems will help make the right decision to fulfill the objectives. Using the KDD in the control of production systems, it can be achieved better understanding of system control and can help predict a future behavior of system. The authors formulated general knowledge for improve parameters of analyzed production process. The objectives, steps and some results of the project are presented in this article

Effect of Selected Priority Rules on Manufacturing Objectives in Scheduling

In this paper, the effect of selected priority rules of scheduling is presented. This effect has been studied for chosen scheduling objectives by simulation method. The authors used the simulator Witness to experimentation with priority rules in a designed manufacturing system. The results of experiments have been processed into the synthesis of knowledge. The implementation of scheduling procedure is described in this paper.