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Papers by Alejandro Carrasco

Research paper thumbnail of Multi-Agent and Embedded System Technologies for Automatic Surveillance

Research paper thumbnail of Multi-Agent and Embedded System Technologies Applied to Improve the Management of Power Systems

International Journal of Digital Content Technology and Its Applications, 2010

This article explores a number of improvements made on Supervisory Control and Data Acquisition (... more This article explores a number of improvements made on Supervisory Control and Data Acquisition (SCADA) systems which allow them to be successfully used for automated surveillance. Even telecontrol operators who have limited experience with computers were able to employ the system without any difficulties. Other advances made by taking advantage of the strongest features of embedded and multi-agent system technologies are also featured in this article. These developments have been tested in a true industrial environment. Positive results and feedback have been provided by the tests.

Research paper thumbnail of Remote Controlling and Monitoring of Safety Devices Using Web-Interface Embedded Systems

To date, access control systems have been hardware-based platforms, where software and hardware p... more To date, access control systems have been hardware-based platforms, where software and hardware parts were uncoupled into different systems. The Department of Electronic Technology in the University of Seville, together with ISIS Engineering, have developed an innovative embedded system that provides all needed functions for controlling and monitoring remote access control systems through a built-in web interface. The design provides a monolithic structure, independence from outer systems, easiness in management and maintenance, conformation to the highest standards in security, and straightforward adaptability to applications other than the original one. We have accomplished it by using an extremely reduced Linux kernel and developing web and purpose-specific logic under software technologies with an optimal resource use.

Research paper thumbnail of Experimental study on the transmission of measurements by tolerance in SCADA systems

IEEE Transactions on Power Delivery, 2004

The study of the existing relationship between a measurement error and the time elapsed since tha... more The study of the existing relationship between a measurement error and the time elapsed since that measurement was taken in the field, a period of time which we will call the datum age, will allow us to learn about its behavior in a supervisory control and data acquisition (SCADA) system. This study has allowed us to know that, in the case of electrical measurements, they quickly reach their maximum error value because of their age. Therefore, it is not necessary to send measurements to the control center at small intervals: it is possible to wait a given time without having a higher associated error. After getting these results, we have done an experimental study about electrical measurements, in which these measurements are sent to the control center only if they exceed a given percentage of the former measurement, what we call measurement tolerance. In this paper, it has been experimentally proved that this send-by-tolerance method significantly reduces the transmission channel load, so the system can benefit from this because the bandwidth can be reused by more remote units, as well as performance of the existing ones is improved.

Research paper thumbnail of Planning Security Policy on E-Commerce

1Negocios en Internet. Banco Español de Crédito. Gran Vía de Hortaleza, 3. 28043 - Madrid. Spain.... more 1Negocios en Internet. Banco Español de Crédito. Gran Vía de Hortaleza, 3. 28043 - Madrid. Spain. e-mail: mmartinv@notes.banesto.es ... 2Facultad de Informática. Universidad de Sevilla. Av. Reina Mercedes, s/n. 41012 - Sevilla. Spain. e-mail: carrasco@dte.us.es

Research paper thumbnail of Information Systems for Improving Competition in Deregulated Electricity Market

This article intends to reflect the dynamism of the process of liberalization currently taking pl... more This article intends to reflect the dynamism of the process of liberalization currently taking place in the Spanish and European electricity sector. It expresses the need for the utilization of an information system which may help companies in this sector make swifter purchases, sales and bids, study market trends, in addition to facilitating cost studies and forecasts for the distribution and regulation of energy. It presents software developed for that purpose and the experiences of companies of the sector.

Research paper thumbnail of Modeling technology-employment relationships

In this paper an analytic model has been developed which, although not pursuing to be absolutely ... more In this paper an analytic model has been developed which, although not pursuing to be absolutely exhaustive, contains more than 15 economic magnitudes and more than 30 relationships among them, offering a much more complete panorama of the technology-employment relationships problem. The initial values of the model variables and parameters have been selected to a better fit of the Spanish economy present situation. Dynamic features have also been introduced to model the evolution in time of the magnitudes.

Research paper thumbnail of Multi-Agent and Embedded System Technologies for Automatic Surveillance

Research paper thumbnail of Multi-Agent and Embedded System Technologies Applied to Improve the Management of Power Systems

International Journal of Digital Content Technology and Its Applications, 2010

This article explores a number of improvements made on Supervisory Control and Data Acquisition (... more This article explores a number of improvements made on Supervisory Control and Data Acquisition (SCADA) systems which allow them to be successfully used for automated surveillance. Even telecontrol operators who have limited experience with computers were able to employ the system without any difficulties. Other advances made by taking advantage of the strongest features of embedded and multi-agent system technologies are also featured in this article. These developments have been tested in a true industrial environment. Positive results and feedback have been provided by the tests.

Research paper thumbnail of Remote Controlling and Monitoring of Safety Devices Using Web-Interface Embedded Systems

To date, access control systems have been hardware-based platforms, where software and hardware p... more To date, access control systems have been hardware-based platforms, where software and hardware parts were uncoupled into different systems. The Department of Electronic Technology in the University of Seville, together with ISIS Engineering, have developed an innovative embedded system that provides all needed functions for controlling and monitoring remote access control systems through a built-in web interface. The design provides a monolithic structure, independence from outer systems, easiness in management and maintenance, conformation to the highest standards in security, and straightforward adaptability to applications other than the original one. We have accomplished it by using an extremely reduced Linux kernel and developing web and purpose-specific logic under software technologies with an optimal resource use.

Research paper thumbnail of Experimental study on the transmission of measurements by tolerance in SCADA systems

IEEE Transactions on Power Delivery, 2004

The study of the existing relationship between a measurement error and the time elapsed since tha... more The study of the existing relationship between a measurement error and the time elapsed since that measurement was taken in the field, a period of time which we will call the datum age, will allow us to learn about its behavior in a supervisory control and data acquisition (SCADA) system. This study has allowed us to know that, in the case of electrical measurements, they quickly reach their maximum error value because of their age. Therefore, it is not necessary to send measurements to the control center at small intervals: it is possible to wait a given time without having a higher associated error. After getting these results, we have done an experimental study about electrical measurements, in which these measurements are sent to the control center only if they exceed a given percentage of the former measurement, what we call measurement tolerance. In this paper, it has been experimentally proved that this send-by-tolerance method significantly reduces the transmission channel load, so the system can benefit from this because the bandwidth can be reused by more remote units, as well as performance of the existing ones is improved.

Research paper thumbnail of Planning Security Policy on E-Commerce

1Negocios en Internet. Banco Español de Crédito. Gran Vía de Hortaleza, 3. 28043 - Madrid. Spain.... more 1Negocios en Internet. Banco Español de Crédito. Gran Vía de Hortaleza, 3. 28043 - Madrid. Spain. e-mail: mmartinv@notes.banesto.es ... 2Facultad de Informática. Universidad de Sevilla. Av. Reina Mercedes, s/n. 41012 - Sevilla. Spain. e-mail: carrasco@dte.us.es

Research paper thumbnail of Information Systems for Improving Competition in Deregulated Electricity Market

This article intends to reflect the dynamism of the process of liberalization currently taking pl... more This article intends to reflect the dynamism of the process of liberalization currently taking place in the Spanish and European electricity sector. It expresses the need for the utilization of an information system which may help companies in this sector make swifter purchases, sales and bids, study market trends, in addition to facilitating cost studies and forecasts for the distribution and regulation of energy. It presents software developed for that purpose and the experiences of companies of the sector.

Research paper thumbnail of Modeling technology-employment relationships

In this paper an analytic model has been developed which, although not pursuing to be absolutely ... more In this paper an analytic model has been developed which, although not pursuing to be absolutely exhaustive, contains more than 15 economic magnitudes and more than 30 relationships among them, offering a much more complete panorama of the technology-employment relationships problem. The initial values of the model variables and parameters have been selected to a better fit of the Spanish economy present situation. Dynamic features have also been introduced to model the evolution in time of the magnitudes.