Rainier Romero - Academia.edu (original) (raw)

Papers by Rainier Romero

Research paper thumbnail of Implementation of Bin Packing Model for Reed Switch Production Planning

This paper presents a form to resolve a real problem of efficient material election in reed switc... more This paper presents a form to resolve a real problem of efficient material election in reed switch manufacturing. The carrying out of the consumer demands depends on the stochastic results of the classification process where each lot of switches is distributed into bins according to an electric measure value. Various glass types are employed for the switch manufacturing. The effect caused by the glass type variation on the switch classification results was investigated. Based on real data statistic analysis, the problem is reduced to the lot number minimizing taking into consideration the glass type, and interpreted as a bin packing problem generalization. On difference to the classic bin packing problem, in the considered case, an item represents a set of pieces; a container is divided into a number of bins (sub-containers) the bin capacity is variable; there are the assignment restrictions between bins and sets of pieces; the items are allowed to be fragmented into bins and contai...

Research paper thumbnail of Multi-Sized Sphere Packings : Models and Recent Approaches

This paper summarizes theoretical and applied studies of the structure of mixtures, formulated as... more This paper summarizes theoretical and applied studies of the structure of mixtures, formulated as the packing of spheres with different sizes. The effects of the particle size and the shape (fine or coarse) on the packing density are described. We discuss the relationships between the particle size distribution and the packing properties. We also sketch the major approaches, which can be usefully applied in nanotechnologies for the modeling of a material structure. Such a kind of analysis can be used both in the theoretical consideration of material engineering problems and in the chemical industry. Potential applications of these results include a synthesis of nanomaterials, adsorbents, catalyst carriers and packings for chromatographic columns.

Research paper thumbnail of Modeling of the material structure using Voronoi diagrams and tessellation methods

Tessellation methods are a relatively new approach for modeling the structure of a material. In t... more Tessellation methods are a relatively new approach for modeling the structure of a material. In this paper, such structures are interpreted as sphere packing models, where molecules and atoms represent spheres of equal or different size. Based on the review of the literature, it is shown that the tessellation approach is a powerful method for modeling and simulating such structures with desirable metric and topological properties. Two basic tessellation methods are considered more in detail: the Delaunay tessellation and the Voronoi diagram in Laguerre geometry, as well as some of their generalizations. The principal concepts of both tessellation methods are briefly explained for a better understanding of the application details. It is noted that packing models created by tessellation methods are not based on the use of the gravity camp effect, which is a difference to numerical and mathematic programming modeling approaches. Therefore, tessellation methods permit the development of...

Research paper thumbnail of Bin Packing Model Implementation for Material Election in Read Switches Production Planning

This paper presents an important real problem in Read Switch manufacturing where an efficient use... more This paper presents an important real problem in Read Switch manufacturing where an efficient use of materials is required. The carrying out of the consumer demands depends on the stochastic results of a classification process where each lot of switches is distributed into bins according to an electric measure value. Various glass types are employed for the switch manufacturing. The effect caused by the glass type variation on the switch classification results was investigated. Based on real data statistic analysis, the problem is reduced to the lots number minimizing taking into consideration the glass type, and interpreted as a bin packing problem generalization. In contrast to the classic problem, in the considered case, an item represents a set of pieces; a container is divided into a number of bins (sub-containers); the bins capacity is variable; there are the assignment restrictions between bins and sets of items; the item sets are allowed to be fragmented into bins and containers. The problem has a high complicity. A heuristic offline algorithm is proposed to find: the number, types and packing sequence of containers, the set fragments coupled with containers and bins. The bin capacities do not affect the algorithm.

Research paper thumbnail of Recent advances on modelling of structures of multi-component mixtures using a sphere packing approach

International Journal of Nanotechnology, 2016

Research paper thumbnail of Bin Packing Model Implementation for Material Election in Read Switches Production Planning

This paper presents an important real problem in Read Switch manufacturing where an efficient use... more This paper presents an important real problem in Read Switch manufacturing where an efficient use of materials is required. The carrying out of the consumer demands depends on the stochastic results of a classification process where each lot of switches is distributed into bins according to an electric measure value. Various glass types are employed for the switch manufacturing. The effect caused by the glass type variation on the switch classification results was investigated. Based on real data statistic analysis, the problem is reduced to the lots number minimizing taking into consideration the glass type, and interpreted as a bin packing problem generalization. In contrast to the classic problem, in the considered case, an item represents a set of pieces; a container is divided into a number of bins (sub-containers); the bins capacity is variable; there are the assignment restrictions between bins and sets of items; the item sets are allowed to be fragmented into bins and containers. The problem has a high complicity. A heuristic offline algorithm is proposed to find: the number, types and packing sequence of containers, the set fragments coupled with containers and bins. The bin capacities do not affect the algorithm.

Research paper thumbnail of Tessellation Methods for Modeling the Material Structure

Applied Mechanics and Materials, 2015

Tessellation methods are a relatively new approach for modeling the structure of a material. In t... more Tessellation methods are a relatively new approach for modeling the structure of a material. In this paper, such structures are interpreted as sphere packing models, where molecules and atoms represent spheres of equal or different size. Based on the review of the literature, it is shown that the tessellation approach is a powerful method for modeling and simulating such structures with desirable metric and topological properties. Two basic tessellation methods are considered more in detail: the Delaunay tessellation and the Voronoi diagram in Laguerre geometry, as well as some of their generalizations. The principal concepts of both tessellation methods are briefly explained for a better understanding of the application details. It is noted that packing models created by tessellation methods are not based on the use of the gravity camp effect, which is a difference to numerical and mathematic programming modeling approaches. Therefore, tessellation methods permit the development of...

Research paper thumbnail of Modeling of the material structure using Voronoi diagrams and tessellation methods

Tessellation methods are a relatively new approach for modeling the structure of a material. In t... more Tessellation methods are a relatively new approach for modeling the structure of a material. In this paper, such structures are interpreted as sphere packing models, where molecules and atoms represent spheres of equal or different size. Based on the review of the literature, it is shown that the tessellation approach is a powerful method for modeling and simulating such structures with desirable metric and topological properties. Two basic tessellation methods are considered more in detail: the Delaunay tessellation and the Voronoi diagram in Laguerre geometry, as well as some of their generalizations. The principal concepts of both tessellation methods are briefly explained for a better understanding of the application details. It is noted that packing models created by tessellation methods are not based on the use of the gravity camp effect, which is a difference to numerical and mathematic programming modeling approaches. Therefore, tessellation methods permit the development of structures without taking into account the gravitation, what is important for modeling the structure on the microscopic and nano levels, where the influence of the gravitation is studied insufficiently. A review of the related literature is given, focusing on the details of the tessellation method and the particle size distribution.

Research paper thumbnail of Multi-Sized Sphere Packings: Models and Recent Approaches

This paper summarizes theoretical and applied studies of the structure of mixtures, formulated as... more This paper summarizes theoretical and applied studies of the structure of mixtures, formulated as the packing of spheres with different sizes. The effects of the particle size and the shape (fine or coarse) on the packing density are described. We discuss the relationships between the particle size distribution and the packing properties. We also sketch the major approaches, which can be usefully applied in nanotechnologies for the modeling of a material structure. Such a kind of analysis can be used both in the theoretical consideration of material engineering problems and in the chemical industry. Potential applications of these results include a synthesis of nanomaterials, adsorbents, catalyst carriers and packings for chromatographic columns.

Research paper thumbnail of Some Aspects of Computer Approaches to Simulation of Bimodal Sphere Packing in Material Engineering

Advanced Materials Research, 2014

This paper summarize idealized theoretical studies of bicomponent particle packing parameters, af... more This paper summarize idealized theoretical studies of bicomponent particle packing parameters, affecting the phase and pore structure of obtained materials. Such a kind of analysis can be used both in theoretical consideration of material engineering problems and in chemical industry. The effects of key variables on the relationship between packing fraction and particle size were re-examined for general application. Potential applications of these results include synthesis of nanopaterials, adsorbents, catalyst carriers and packing for chromatographic columns. Directions for future research are suggested.

Research paper thumbnail of Scheduling Methods for Hybrid Flow Shops with Setup Times

Future Manufacturing Systems, 2010

Research paper thumbnail of Lot Processing in Hybrid Flow Shop Scheduling Problem

Production Scheduling, 2012

Research paper thumbnail of Implementation of Bin Packing Model for Reed Switch Production Planning

This paper presents a form to resolve a real problem of efficient material election in reed switc... more This paper presents a form to resolve a real problem of efficient material election in reed switch manufacturing. The carrying out of the consumer demands depends on the stochastic results of the classification process where each lot of switches is distributed into bins according to an electric measure value. Various glass types are employed for the switch manufacturing. The effect caused by the glass type variation on the switch classification results was investigated. Based on real data statistic analysis, the problem is reduced to the lot number minimizing taking into consideration the glass type, and interpreted as a bin packing problem generalization. On difference to the classic bin packing problem, in the considered case, an item represents a set of pieces; a container is divided into a number of bins (sub-containers) the bin capacity is variable; there are the assignment restrictions between bins and sets of pieces; the items are allowed to be fragmented into bins and containers. The problem has a high complexity. A heuristic offline algorithm is proposed to find the quantity, types and packing sequence of containers, the item fragments associated with containers and bins. The bin capacities do not affect the algorithm.

Research paper thumbnail of Lot Processing in Hybrid Flow Shop Scheduling Problem

Research paper thumbnail of Implementation of Bin Packing Model for Reed Switch Production Planning

This paper presents a form to resolve a real problem of efficient material election in reed switc... more This paper presents a form to resolve a real problem of efficient material election in reed switch manufacturing. The carrying out of the consumer demands depends on the stochastic results of the classification process where each lot of switches is distributed into bins according to an electric measure value. Various glass types are employed for the switch manufacturing. The effect caused by the glass type variation on the switch classification results was investigated. Based on real data statistic analysis, the problem is reduced to the lot number minimizing taking into consideration the glass type, and interpreted as a bin packing problem generalization. On difference to the classic bin packing problem, in the considered case, an item represents a set of pieces; a container is divided into a number of bins (sub-containers) the bin capacity is variable; there are the assignment restrictions between bins and sets of pieces; the items are allowed to be fragmented into bins and contai...

Research paper thumbnail of Multi-Sized Sphere Packings : Models and Recent Approaches

This paper summarizes theoretical and applied studies of the structure of mixtures, formulated as... more This paper summarizes theoretical and applied studies of the structure of mixtures, formulated as the packing of spheres with different sizes. The effects of the particle size and the shape (fine or coarse) on the packing density are described. We discuss the relationships between the particle size distribution and the packing properties. We also sketch the major approaches, which can be usefully applied in nanotechnologies for the modeling of a material structure. Such a kind of analysis can be used both in the theoretical consideration of material engineering problems and in the chemical industry. Potential applications of these results include a synthesis of nanomaterials, adsorbents, catalyst carriers and packings for chromatographic columns.

Research paper thumbnail of Modeling of the material structure using Voronoi diagrams and tessellation methods

Tessellation methods are a relatively new approach for modeling the structure of a material. In t... more Tessellation methods are a relatively new approach for modeling the structure of a material. In this paper, such structures are interpreted as sphere packing models, where molecules and atoms represent spheres of equal or different size. Based on the review of the literature, it is shown that the tessellation approach is a powerful method for modeling and simulating such structures with desirable metric and topological properties. Two basic tessellation methods are considered more in detail: the Delaunay tessellation and the Voronoi diagram in Laguerre geometry, as well as some of their generalizations. The principal concepts of both tessellation methods are briefly explained for a better understanding of the application details. It is noted that packing models created by tessellation methods are not based on the use of the gravity camp effect, which is a difference to numerical and mathematic programming modeling approaches. Therefore, tessellation methods permit the development of...

Research paper thumbnail of Bin Packing Model Implementation for Material Election in Read Switches Production Planning

This paper presents an important real problem in Read Switch manufacturing where an efficient use... more This paper presents an important real problem in Read Switch manufacturing where an efficient use of materials is required. The carrying out of the consumer demands depends on the stochastic results of a classification process where each lot of switches is distributed into bins according to an electric measure value. Various glass types are employed for the switch manufacturing. The effect caused by the glass type variation on the switch classification results was investigated. Based on real data statistic analysis, the problem is reduced to the lots number minimizing taking into consideration the glass type, and interpreted as a bin packing problem generalization. In contrast to the classic problem, in the considered case, an item represents a set of pieces; a container is divided into a number of bins (sub-containers); the bins capacity is variable; there are the assignment restrictions between bins and sets of items; the item sets are allowed to be fragmented into bins and containers. The problem has a high complicity. A heuristic offline algorithm is proposed to find: the number, types and packing sequence of containers, the set fragments coupled with containers and bins. The bin capacities do not affect the algorithm.

Research paper thumbnail of Recent advances on modelling of structures of multi-component mixtures using a sphere packing approach

International Journal of Nanotechnology, 2016

Research paper thumbnail of Bin Packing Model Implementation for Material Election in Read Switches Production Planning

This paper presents an important real problem in Read Switch manufacturing where an efficient use... more This paper presents an important real problem in Read Switch manufacturing where an efficient use of materials is required. The carrying out of the consumer demands depends on the stochastic results of a classification process where each lot of switches is distributed into bins according to an electric measure value. Various glass types are employed for the switch manufacturing. The effect caused by the glass type variation on the switch classification results was investigated. Based on real data statistic analysis, the problem is reduced to the lots number minimizing taking into consideration the glass type, and interpreted as a bin packing problem generalization. In contrast to the classic problem, in the considered case, an item represents a set of pieces; a container is divided into a number of bins (sub-containers); the bins capacity is variable; there are the assignment restrictions between bins and sets of items; the item sets are allowed to be fragmented into bins and containers. The problem has a high complicity. A heuristic offline algorithm is proposed to find: the number, types and packing sequence of containers, the set fragments coupled with containers and bins. The bin capacities do not affect the algorithm.

Research paper thumbnail of Tessellation Methods for Modeling the Material Structure

Applied Mechanics and Materials, 2015

Tessellation methods are a relatively new approach for modeling the structure of a material. In t... more Tessellation methods are a relatively new approach for modeling the structure of a material. In this paper, such structures are interpreted as sphere packing models, where molecules and atoms represent spheres of equal or different size. Based on the review of the literature, it is shown that the tessellation approach is a powerful method for modeling and simulating such structures with desirable metric and topological properties. Two basic tessellation methods are considered more in detail: the Delaunay tessellation and the Voronoi diagram in Laguerre geometry, as well as some of their generalizations. The principal concepts of both tessellation methods are briefly explained for a better understanding of the application details. It is noted that packing models created by tessellation methods are not based on the use of the gravity camp effect, which is a difference to numerical and mathematic programming modeling approaches. Therefore, tessellation methods permit the development of...

Research paper thumbnail of Modeling of the material structure using Voronoi diagrams and tessellation methods

Tessellation methods are a relatively new approach for modeling the structure of a material. In t... more Tessellation methods are a relatively new approach for modeling the structure of a material. In this paper, such structures are interpreted as sphere packing models, where molecules and atoms represent spheres of equal or different size. Based on the review of the literature, it is shown that the tessellation approach is a powerful method for modeling and simulating such structures with desirable metric and topological properties. Two basic tessellation methods are considered more in detail: the Delaunay tessellation and the Voronoi diagram in Laguerre geometry, as well as some of their generalizations. The principal concepts of both tessellation methods are briefly explained for a better understanding of the application details. It is noted that packing models created by tessellation methods are not based on the use of the gravity camp effect, which is a difference to numerical and mathematic programming modeling approaches. Therefore, tessellation methods permit the development of structures without taking into account the gravitation, what is important for modeling the structure on the microscopic and nano levels, where the influence of the gravitation is studied insufficiently. A review of the related literature is given, focusing on the details of the tessellation method and the particle size distribution.

Research paper thumbnail of Multi-Sized Sphere Packings: Models and Recent Approaches

This paper summarizes theoretical and applied studies of the structure of mixtures, formulated as... more This paper summarizes theoretical and applied studies of the structure of mixtures, formulated as the packing of spheres with different sizes. The effects of the particle size and the shape (fine or coarse) on the packing density are described. We discuss the relationships between the particle size distribution and the packing properties. We also sketch the major approaches, which can be usefully applied in nanotechnologies for the modeling of a material structure. Such a kind of analysis can be used both in the theoretical consideration of material engineering problems and in the chemical industry. Potential applications of these results include a synthesis of nanomaterials, adsorbents, catalyst carriers and packings for chromatographic columns.

Research paper thumbnail of Some Aspects of Computer Approaches to Simulation of Bimodal Sphere Packing in Material Engineering

Advanced Materials Research, 2014

This paper summarize idealized theoretical studies of bicomponent particle packing parameters, af... more This paper summarize idealized theoretical studies of bicomponent particle packing parameters, affecting the phase and pore structure of obtained materials. Such a kind of analysis can be used both in theoretical consideration of material engineering problems and in chemical industry. The effects of key variables on the relationship between packing fraction and particle size were re-examined for general application. Potential applications of these results include synthesis of nanopaterials, adsorbents, catalyst carriers and packing for chromatographic columns. Directions for future research are suggested.

Research paper thumbnail of Scheduling Methods for Hybrid Flow Shops with Setup Times

Future Manufacturing Systems, 2010

Research paper thumbnail of Lot Processing in Hybrid Flow Shop Scheduling Problem

Production Scheduling, 2012

Research paper thumbnail of Implementation of Bin Packing Model for Reed Switch Production Planning

This paper presents a form to resolve a real problem of efficient material election in reed switc... more This paper presents a form to resolve a real problem of efficient material election in reed switch manufacturing. The carrying out of the consumer demands depends on the stochastic results of the classification process where each lot of switches is distributed into bins according to an electric measure value. Various glass types are employed for the switch manufacturing. The effect caused by the glass type variation on the switch classification results was investigated. Based on real data statistic analysis, the problem is reduced to the lot number minimizing taking into consideration the glass type, and interpreted as a bin packing problem generalization. On difference to the classic bin packing problem, in the considered case, an item represents a set of pieces; a container is divided into a number of bins (sub-containers) the bin capacity is variable; there are the assignment restrictions between bins and sets of pieces; the items are allowed to be fragmented into bins and containers. The problem has a high complexity. A heuristic offline algorithm is proposed to find the quantity, types and packing sequence of containers, the item fragments associated with containers and bins. The bin capacities do not affect the algorithm.

Research paper thumbnail of Lot Processing in Hybrid Flow Shop Scheduling Problem