ABSTRACT This paper presents the electronic application “e-Bank” accessing a relational database ... more ABSTRACT This paper presents the electronic application “e-Bank” accessing a relational database through internet. The application is relied on open source software. MySQL is used as a relational database system for the database design. Scripting language TCL was preferred as the computer language used for the development of the application. The aim of the application is to provide easy access to the Examination Past Papers of the Information Management Department of Technological Institute of Kavala, to each user. The users are separated to two different groups and a number of functionalities like searching, altering or deleting an entry in the database are available. A careful approach concerning the security of the application was considered taking into account that the software used are Unix operating system based.
ABSTRACT This paper presents the electronic application “e-Exams” accessing a relational database... more ABSTRACT This paper presents the electronic application “e-Exams” accessing a relational database through internet. The application is relied on open source software. MySQL is used as a relational database system for the database design. Scripting language TCL was preferred as the computer language used for the development of the application. The aim of the application is to provide an easier and efficient way carrying out electronic examinations for the Information Management Department of Technological Institute of Kavala. The users are separated to two different groups (academic staff and students). Each group is provided by a number of functionalities. A careful approach concerning the security of the application was considered taking into account that the software used is based on UNIX operating system.
Change of DNA sequence that fuels evolution is, to a certain extent, a deterministic process beca... more Change of DNA sequence that fuels evolution is, to a certain extent, a deterministic process because mutagenesis does not occur in an absolutely random manner. So far, it has not been possible to decipher the rules that govern DNA sequence evolution due to the extreme complexity of the entire process. In our attempt to approach this issue we focus solely on the mechanisms of mutagenesis and deliberately disregard the role of natural selection. Hence, in this analysis, evolution refers to the accumulation of genetic alterations that originate from mutations and are transmitted through generations without being subjected to natural selection. We have developed a software tool that allows modelling of a DNA sequence as a one-dimensional cellular automaton (CA) with four states per cell which correspond to the four DNA bases, i.e. A, C, T and G. The four states are represented by numbers of the quaternary number system. Moreover, we have developed genetic algorithms (GAs) in order to determine the rules of CA evolution that simulate the DNA evolution process. Linear evolution rules were considered and square matrices were used to represent them. If DNA sequences of different evolution steps are available, our approach allows the determination of the underlying evolution rule(s). Conversely, once the evolution rules are deciphered, our tool may reconstruct the DNA sequence in any previous evolution step for which the exact sequence information was unknown. The developed tool may be used to test various parameters that could influence evolution. We describe a paradigm relying on the assumption that mutagenesis is governed by a near-neighbour-dependent mechanism. Based on the satisfactory performance of our system in the deliberately simplified example, we propose that our approach could offer a starting point for future attempts to understand the mechanisms that govern evolution. The developed software is open-source and has a user-friendly graphical input interface.
Cellular automata are introduced as a model for DNA structure, function and evolution. DNA is mod... more Cellular automata are introduced as a model for DNA structure, function and evolution. DNA is modeled as a one-dimensional cellular automaton with four states per cell. These states are the four DNA bases A, C, T and G. The four states are represented by numbers of the quaternary number system. Linear evolution rules, represented by square matrices, are considered. Based on this model a simulator of DNA evolution is developed and simulation results are presented. This simulator has a user-friendly input interface and can be used for the study of DNA evolution.
Cellular automata are introduced as a model for DNA structure, function and evolution. DNA is mod... more Cellular automata are introduced as a model for DNA structure, function and evolution. DNA is modeled as a one-dimensional cellular automaton with four states per cell. These states are the four DNA bases A, C, T and G. The four states are represented by numbers of the quaternary number system. Linear evolution rules, represented by square matrices, are considered. Based on this model a simulator of DNA evolution is developed and simulation results are presented. This simulator has a user-friendly input interface and can be used for the study of DNA evolution.
IEEE Transactions on Systems, Man, and Cybernetics, Part C (Applications and Reviews), 2000
The increasing complexity of computer networks calls for the development of new models for their ... more The increasing complexity of computer networks calls for the development of new models for their simulation. Cellular automata (CAs) are a well-known and successful model for complex systems. This paper presents a system for modeling and simulation of computer networks based on CAs. More specifically, a 2D NaSch CA computer network model has been developed, and several networks were simulated.
ABSTRACT This paper presents the electronic application “e-Bank” accessing a relational database ... more ABSTRACT This paper presents the electronic application “e-Bank” accessing a relational database through internet. The application is relied on open source software. MySQL is used as a relational database system for the database design. Scripting language TCL was preferred as the computer language used for the development of the application. The aim of the application is to provide easy access to the Examination Past Papers of the Information Management Department of Technological Institute of Kavala, to each user. The users are separated to two different groups and a number of functionalities like searching, altering or deleting an entry in the database are available. A careful approach concerning the security of the application was considered taking into account that the software used are Unix operating system based.
ABSTRACT This paper presents the electronic application “e-Exams” accessing a relational database... more ABSTRACT This paper presents the electronic application “e-Exams” accessing a relational database through internet. The application is relied on open source software. MySQL is used as a relational database system for the database design. Scripting language TCL was preferred as the computer language used for the development of the application. The aim of the application is to provide an easier and efficient way carrying out electronic examinations for the Information Management Department of Technological Institute of Kavala. The users are separated to two different groups (academic staff and students). Each group is provided by a number of functionalities. A careful approach concerning the security of the application was considered taking into account that the software used is based on UNIX operating system.
Change of DNA sequence that fuels evolution is, to a certain extent, a deterministic process beca... more Change of DNA sequence that fuels evolution is, to a certain extent, a deterministic process because mutagenesis does not occur in an absolutely random manner. So far, it has not been possible to decipher the rules that govern DNA sequence evolution due to the extreme complexity of the entire process. In our attempt to approach this issue we focus solely on the mechanisms of mutagenesis and deliberately disregard the role of natural selection. Hence, in this analysis, evolution refers to the accumulation of genetic alterations that originate from mutations and are transmitted through generations without being subjected to natural selection. We have developed a software tool that allows modelling of a DNA sequence as a one-dimensional cellular automaton (CA) with four states per cell which correspond to the four DNA bases, i.e. A, C, T and G. The four states are represented by numbers of the quaternary number system. Moreover, we have developed genetic algorithms (GAs) in order to determine the rules of CA evolution that simulate the DNA evolution process. Linear evolution rules were considered and square matrices were used to represent them. If DNA sequences of different evolution steps are available, our approach allows the determination of the underlying evolution rule(s). Conversely, once the evolution rules are deciphered, our tool may reconstruct the DNA sequence in any previous evolution step for which the exact sequence information was unknown. The developed tool may be used to test various parameters that could influence evolution. We describe a paradigm relying on the assumption that mutagenesis is governed by a near-neighbour-dependent mechanism. Based on the satisfactory performance of our system in the deliberately simplified example, we propose that our approach could offer a starting point for future attempts to understand the mechanisms that govern evolution. The developed software is open-source and has a user-friendly graphical input interface.
Cellular automata are introduced as a model for DNA structure, function and evolution. DNA is mod... more Cellular automata are introduced as a model for DNA structure, function and evolution. DNA is modeled as a one-dimensional cellular automaton with four states per cell. These states are the four DNA bases A, C, T and G. The four states are represented by numbers of the quaternary number system. Linear evolution rules, represented by square matrices, are considered. Based on this model a simulator of DNA evolution is developed and simulation results are presented. This simulator has a user-friendly input interface and can be used for the study of DNA evolution.
Cellular automata are introduced as a model for DNA structure, function and evolution. DNA is mod... more Cellular automata are introduced as a model for DNA structure, function and evolution. DNA is modeled as a one-dimensional cellular automaton with four states per cell. These states are the four DNA bases A, C, T and G. The four states are represented by numbers of the quaternary number system. Linear evolution rules, represented by square matrices, are considered. Based on this model a simulator of DNA evolution is developed and simulation results are presented. This simulator has a user-friendly input interface and can be used for the study of DNA evolution.
IEEE Transactions on Systems, Man, and Cybernetics, Part C (Applications and Reviews), 2000
The increasing complexity of computer networks calls for the development of new models for their ... more The increasing complexity of computer networks calls for the development of new models for their simulation. Cellular automata (CAs) are a well-known and successful model for complex systems. This paper presents a system for modeling and simulation of computer networks based on CAs. More specifically, a 2D NaSch CA computer network model has been developed, and several networks were simulated.
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