Ketty Peeva - Profile on Academia.edu (original) (raw)

Papers by Ketty Peeva

This paper presents optimization problem with a linear objective function subject to constraint -... more This paper presents optimization problem with a linear objective function subject to constraint -fuzzy linear system of equations or fuzzy linear system of inequalities, with max-product composition. Methods that provide algorithm for computing the maximum solution and all minimal solutions, when the fuzzy linear system is consistent, are developed for constraint resolution. A software is developed in MATLAB and Java.

Computing behavior of finite fuzzy machines – Algorithm and its application to reduction and minimization

Information Sciences, Nov 1, 2008

We define finite fuzzy machines and investigate their behavior. Algorithm and software are propos... more We define finite fuzzy machines and investigate their behavior. Algorithm and software are proposed for computing behavior, for establishing equivalence and redundancy of states and for solving reduction and minimization problems. Computational complexity of the algorithm is discussed. Testing examples are supplied. The results are valid for finite max–min, min–max and max–product fuzzy machines.

Optimization of Linear Objective Function Under Max-product

Algorithm and software for solving fuzzy relational equations in some BL-algebras

We study fuzzy linear systems of equations when the composition is infrarr. Algebraic-logical app... more We study fuzzy linear systems of equations when the composition is infrarr. Algebraic-logical approach and procedures for inverse problem resolution are proposed. They provide algorithm for solving fuzzy linear system of equations in Godel algebra, product (Goguen) algebra and Lukasiewicz algebra: when the system is consistent, its complete solution set is calculated. In case of inconsistency, the equations that can

Optimization of Linear Objective Function under Fuzzy Equation Constraint in BL − Algebras – Theory, Algorithm and Software

Springer eBooks, 2010

Postgraduate Medicine, 2020

The aim of this research is by using sociological methods of scientific research for tracking the... more The aim of this research is by using sociological methods of scientific research for tracking the pain and satisfaction indicators to prove that decreasing the number of ports in the VATS for Malignant Pleural Effusion reduces postoperative pain and improves patient's satisfaction. Our study included 117 VATS procedures performed in the period from 01.01.2013 to 31.09.2016. The sociological method used to measure the pain indicator was an interview. The severity of postoperative pain was determined and reported according to a 10-point pain visual analogue scale (VAS). The degree of satisfaction was determined and reported according to a 6-point and 10-point grading systems on the basis of a research interview procedure. In the single-port method, the verbal pain scale for all the days covered by the research study statistically showed significantly lower values (P˂0.0001) in comparison with the conventional method (P˂0.0001). With regard to the patient's satisfaction, determined on the basis of the six-point system, the results were as follows: conventional VATS approachaverage 3.1 with a standard deviation of 1.1 and ranging from 0 to 5; single-port VATS approach-average 4.3 with a standard deviation of 1.0 and within the range from 0 to 6. Conventional VATS approach -6.8 -neutral. Single-port VATS approach -8.1 -prevailing satisfaction. Based on our study and the studies of other authors, it can be concluded that post-operative pain and satisfaction after VATS in patients with MPE are influenced by the number of ports and the one-port technique shows better results than the conventional three-port method. The research study was registered and approved by the Clinical Research and Ethics Committee at the "Prof. Dr.

Resolution of max −t-norm fuzzy linear system of equations in BL−algebras

Nucleation and Atmospheric Aerosols, 2016

We propose method and algorithm for inverse problem resolution of fuzzy linear system of equation... more We propose method and algorithm for inverse problem resolution of fuzzy linear system of equations in BL-algebras when the composition is max −t−norm.

𝕃–Fuzzy Finite Machines

Advances in fuzzy systems, 2005

Fuzzy Languages in Syntactic Pattern Recognition

Advances in fuzzy systems, 2005

Fuzzy Relational Equations

Advances in fuzzy systems, 2005

Max-Product Fuzzy Relational Equations as Inference Engine for Prediction of Textile Yarn Properties

Springer eBooks, Sep 8, 2006

... 1). This corresponds to the forward scheme of reasoning, or to the so called direct problem .... more ... 1). This corresponds to the forward scheme of reasoning, or to the so called direct problem ... On the language of the application engineers this solution set means, that we can obtain the same ... into account the spread of the parameters, that is usually for the textile products, we use ...

Elsevier's dictionary of mathematics: in English, German, French and Russian

... Here are some topics we find in these papers (we can only men-tion a few, the list is much lo... more ... Here are some topics we find in these papers (we can only men-tion a few, the list is much longer): the Abhyankar conjecture, tech ... Here is a volume with interesting methods, examples, attempts and se-minal ideas around the Inverse Galois Theory; full of ideas, and nice to read ...

Fuzzy relational equations - Min-Goguen implication

“TOPICAL ISSUES OF THERMOPHYSICS, ENERGETICS AND HYDROGASDYNAMICS IN THE ARCTIC CONDITIONS”: Dedicated to the 85th Birthday Anniversary of Professor E. A. Bondarev

“TOPICAL ISSUES OF THERMOPHYSICS, ENERGETICS AND HYDROGASDYNAMICS IN THE ARCTIC CONDITIONS”: Dedicated to the 85th Birthday Anniversary of Professor E. A. Bondarev

An algorithms for solving Min-Goguen fuzzy linear systems of inequalities is presented in this pa... more An algorithms for solving Min-Goguen fuzzy linear systems of inequalities is presented in this paper. Based on the logic for solving fuzzy linear systems of equations, we propose two separate algorithms for solving corresponding types of fuzzy linear systems of inequalities. Examples as well as analysis of the computational and memory complexity are also given.

9th WSEAS International Conference on FUZZY SYSTEMS (FS’08), 2008

This paper presents optimization problem with a linear objective function subject to constraint-f... more This paper presents optimization problem with a linear objective function subject to constraint-fuzzy linear system of equations or fuzzy linear system of inequalities, with max-product composition. Methods that provide algorithm for computing the maximum solution and all minimal solutions, when the fuzzy linear system is consistent, are developed for constraint resolution. A software is developed in MATLAB and Java.

Fuzzy Relations.: Direct Problem Resolution

Applications as Inference Engine

Fuzzy relational calculus toolbox – Package for matrix operations in BL–algebras

AIP Conference Proceedings, 2015

We propose software for direct problem resolution in some BL-algebras.We propose software for dir... more We propose software for direct problem resolution in some BL-algebras.We propose software for direct problem resolution in some BL-algebras.

Software for Solving Fuzzy Linear Systems

AIP Conference Proceedings, 2009

The paper presents method, algorithm and software in Java for solving fuzzy linear systems of equ... more The paper presents method, algorithm and software in Java for solving fuzzy linear systems of equations or fuzzy linear systems of inequalities. We implement software for calculating all minimum and maximum solutions of fuzzy linear systems when the composition is max‐ ...

Fuzzy Linear Systems – Dual Approach

This paper presents optimization problem with a linear objective function subject to constraint -... more This paper presents optimization problem with a linear objective function subject to constraint -fuzzy linear system of equations or fuzzy linear system of inequalities, with max-product composition. Methods that provide algorithm for computing the maximum solution and all minimal solutions, when the fuzzy linear system is consistent, are developed for constraint resolution. A software is developed in MATLAB and Java.

Computing behavior of finite fuzzy machines – Algorithm and its application to reduction and minimization

Information Sciences, Nov 1, 2008

We define finite fuzzy machines and investigate their behavior. Algorithm and software are propos... more We define finite fuzzy machines and investigate their behavior. Algorithm and software are proposed for computing behavior, for establishing equivalence and redundancy of states and for solving reduction and minimization problems. Computational complexity of the algorithm is discussed. Testing examples are supplied. The results are valid for finite max–min, min–max and max–product fuzzy machines.

Optimization of Linear Objective Function Under Max-product

Algorithm and software for solving fuzzy relational equations in some BL-algebras

We study fuzzy linear systems of equations when the composition is infrarr. Algebraic-logical app... more We study fuzzy linear systems of equations when the composition is infrarr. Algebraic-logical approach and procedures for inverse problem resolution are proposed. They provide algorithm for solving fuzzy linear system of equations in Godel algebra, product (Goguen) algebra and Lukasiewicz algebra: when the system is consistent, its complete solution set is calculated. In case of inconsistency, the equations that can

Optimization of Linear Objective Function under Fuzzy Equation Constraint in BL − Algebras – Theory, Algorithm and Software

Springer eBooks, 2010

Postgraduate Medicine, 2020

The aim of this research is by using sociological methods of scientific research for tracking the... more The aim of this research is by using sociological methods of scientific research for tracking the pain and satisfaction indicators to prove that decreasing the number of ports in the VATS for Malignant Pleural Effusion reduces postoperative pain and improves patient's satisfaction. Our study included 117 VATS procedures performed in the period from 01.01.2013 to 31.09.2016. The sociological method used to measure the pain indicator was an interview. The severity of postoperative pain was determined and reported according to a 10-point pain visual analogue scale (VAS). The degree of satisfaction was determined and reported according to a 6-point and 10-point grading systems on the basis of a research interview procedure. In the single-port method, the verbal pain scale for all the days covered by the research study statistically showed significantly lower values (P˂0.0001) in comparison with the conventional method (P˂0.0001). With regard to the patient's satisfaction, determined on the basis of the six-point system, the results were as follows: conventional VATS approachaverage 3.1 with a standard deviation of 1.1 and ranging from 0 to 5; single-port VATS approach-average 4.3 with a standard deviation of 1.0 and within the range from 0 to 6. Conventional VATS approach -6.8 -neutral. Single-port VATS approach -8.1 -prevailing satisfaction. Based on our study and the studies of other authors, it can be concluded that post-operative pain and satisfaction after VATS in patients with MPE are influenced by the number of ports and the one-port technique shows better results than the conventional three-port method. The research study was registered and approved by the Clinical Research and Ethics Committee at the "Prof. Dr.

Resolution of max −t-norm fuzzy linear system of equations in BL−algebras

Nucleation and Atmospheric Aerosols, 2016

We propose method and algorithm for inverse problem resolution of fuzzy linear system of equation... more We propose method and algorithm for inverse problem resolution of fuzzy linear system of equations in BL-algebras when the composition is max −t−norm.

𝕃–Fuzzy Finite Machines

Advances in fuzzy systems, 2005

Fuzzy Languages in Syntactic Pattern Recognition

Advances in fuzzy systems, 2005

Fuzzy Relational Equations

Advances in fuzzy systems, 2005

Max-Product Fuzzy Relational Equations as Inference Engine for Prediction of Textile Yarn Properties

Springer eBooks, Sep 8, 2006

... 1). This corresponds to the forward scheme of reasoning, or to the so called direct problem .... more ... 1). This corresponds to the forward scheme of reasoning, or to the so called direct problem ... On the language of the application engineers this solution set means, that we can obtain the same ... into account the spread of the parameters, that is usually for the textile products, we use ...

Elsevier's dictionary of mathematics: in English, German, French and Russian

... Here are some topics we find in these papers (we can only men-tion a few, the list is much lo... more ... Here are some topics we find in these papers (we can only men-tion a few, the list is much longer): the Abhyankar conjecture, tech ... Here is a volume with interesting methods, examples, attempts and se-minal ideas around the Inverse Galois Theory; full of ideas, and nice to read ...

Fuzzy relational equations - Min-Goguen implication

“TOPICAL ISSUES OF THERMOPHYSICS, ENERGETICS AND HYDROGASDYNAMICS IN THE ARCTIC CONDITIONS”: Dedicated to the 85th Birthday Anniversary of Professor E. A. Bondarev

“TOPICAL ISSUES OF THERMOPHYSICS, ENERGETICS AND HYDROGASDYNAMICS IN THE ARCTIC CONDITIONS”: Dedicated to the 85th Birthday Anniversary of Professor E. A. Bondarev

An algorithms for solving Min-Goguen fuzzy linear systems of inequalities is presented in this pa... more An algorithms for solving Min-Goguen fuzzy linear systems of inequalities is presented in this paper. Based on the logic for solving fuzzy linear systems of equations, we propose two separate algorithms for solving corresponding types of fuzzy linear systems of inequalities. Examples as well as analysis of the computational and memory complexity are also given.

9th WSEAS International Conference on FUZZY SYSTEMS (FS’08), 2008

This paper presents optimization problem with a linear objective function subject to constraint-f... more This paper presents optimization problem with a linear objective function subject to constraint-fuzzy linear system of equations or fuzzy linear system of inequalities, with max-product composition. Methods that provide algorithm for computing the maximum solution and all minimal solutions, when the fuzzy linear system is consistent, are developed for constraint resolution. A software is developed in MATLAB and Java.

Fuzzy Relations.: Direct Problem Resolution

Applications as Inference Engine

Fuzzy relational calculus toolbox – Package for matrix operations in BL–algebras

AIP Conference Proceedings, 2015

We propose software for direct problem resolution in some BL-algebras.We propose software for dir... more We propose software for direct problem resolution in some BL-algebras.We propose software for direct problem resolution in some BL-algebras.

Software for Solving Fuzzy Linear Systems

AIP Conference Proceedings, 2009

The paper presents method, algorithm and software in Java for solving fuzzy linear systems of equ... more The paper presents method, algorithm and software in Java for solving fuzzy linear systems of equations or fuzzy linear systems of inequalities. We implement software for calculating all minimum and maximum solutions of fuzzy linear systems when the composition is max‐ ...

Fuzzy Linear Systems – Dual Approach