http://hdl.handle.net/2117/3887 Fri, 24 May 2013 13:22:49 GMT 2013-05-24T13:22:49Z webmaster.bupc@upc.edu Universitat Politècnica de Catalunya. Servei de Biblioteques i Documentació no http://hdl.handle.net/2117/15823 Title: Load splitting in clusters of video servers Authors: Cruz Llopis, Luis Javier de la; Vázquez Rodas, Andrés; Sanvicente Gargallo, Emilio; Aguilar Igartua, Mónica Abstract: Nowadays, video on demand is one of the services more highly appreciated and demanded by customers. As the number of users increases, the capacity of the system that provides these services must also be increased to guarantee the required quality of service. An approach to that end is to have available several videoservers at various distribution points in order to satisfy the different incoming demands (videoservercluster). When a movie demand arrives to such a cluster, a load balancing device must assign the request to a specific server according to a procedure that must be fast, easy to implement and scalable. In this article we consider the problem of appropriately splitting this load to improve on the system performance. After an analysis of the video packet generation, we point out the similarity between this problem and that of optimally routing packets in data networks. With this similarity in mind, a new mechanism to select the appropriate videoserver is proposed. The purpose of this mechanism is to minimize the average packet transfer time (waiting time plus transmission time) at the videoservercluster. In this way, we are able to obtain a dynamic load balancing policy that performs satisfactorily and that is very easy to implement in practice. The results of several experiments run with real data are shown and commented to substantiate our claims. A description of a practical implementation of the system is also included. Thu, 10 May 2012 17:51:59 GMT http://hdl.handle.net/2117/15823 2012-05-10T17:51:59Z Cruz Llopis, Luis Javier de la; Vázquez Rodas, Andrés; Sanvicente Gargallo, Emilio; Aguilar Igartua, Mónica no Nowadays, video on demand is one of the services more highly appreciated and demanded by customers. As the number of users increases, the capacity of the system that provides these services must also be increased to guarantee the required quality of service. An approach to that end is to have available several videoservers at various distribution points in order to satisfy the different incoming demands (videoservercluster). When a movie demand arrives to such a cluster, a load balancing device must assign the request to a specific server according to a procedure that must be fast, easy to implement and scalable. In this article we consider the problem of appropriately splitting this load to improve on the system performance. After an analysis of the video packet generation, we point out the similarity between this problem and that of optimally routing packets in data networks. With this similarity in mind, a new mechanism to select the appropriate videoserver is proposed. The purpose of this mechanism is to minimize the average packet transfer time (waiting time plus transmission time) at the videoservercluster. In this way, we are able to obtain a dynamic load balancing policy that performs satisfactorily and that is very easy to implement in practice. The results of several experiments run with real data are shown and commented to substantiate our claims. A description of a practical implementation of the system is also included. http://hdl.handle.net/2117/14843 Title: How evolving network access and network management technologies are redefining the competitive wireless markets Authors: Beltran, Fernando; Gutierrez, Jairo A.; Melus Moreno, José Luis Abstract: This paper examines some of the key problems users encounter when accessing current generation wireless networks. Using a case study of a hypothetical user, the authors explore the emerging services and the new broadband wireless network technologies necessary to carry them out. This paper analyses the issues associated with an observed trend in the industry that exposes potential changes to the long-term, rigid commercial relation between wireless providers and users: as a result of a range of evolved broadband wireless access standards and technologies, autonomic communications and policy-based management, and new pricing schemes, consumers will likely face new opportunities to enter short-term and spot contracts with the new wireless providers. This new landscape also allow multiple competing Access Providers (APs) to dynamically assign prices, and poses new and interesting challenges to the regulatory function. The paper also discusses a framework for the integration of heterogeneous technologies and mana ment policies based on the network context that make up this emerging, hybrid wireless landscape, and describes the economic characteristics of new markets likely to arise. Thu, 26 Jan 2012 19:29:46 GMT http://hdl.handle.net/2117/14843 2012-01-26T19:29:46Z Beltran, Fernando; Gutierrez, Jairo A.; Melus Moreno, José Luis no This paper examines some of the key problems users encounter when accessing current generation wireless networks. Using a case study of a hypothetical user, the authors explore the emerging services and the new broadband wireless network technologies necessary to carry them out. This paper analyses the issues associated with an observed trend in the industry that exposes potential changes to the long-term, rigid commercial relation between wireless providers and users: as a result of a range of evolved broadband wireless access standards and technologies, autonomic communications and policy-based management, and new pricing schemes, consumers will likely face new opportunities to enter short-term and spot contracts with the new wireless providers. This new landscape also allow multiple competing Access Providers (APs) to dynamically assign prices, and poses new and interesting challenges to the regulatory function. The paper also discusses a framework for the integration of heterogeneous technologies and mana ment policies based on the network context that make up this emerging, hybrid wireless landscape, and describes the economic characteristics of new markets likely to arise. http://hdl.handle.net/2117/14387 Title: Scalable service deployment on software-defined networks Authors: Rubio Loyola, Javier; Galis, A.; Astorga Rivera, José Antonio; Serrat Fernández, Juan; Lefevre, L.; Fischer, Andreas; Paler, A.; de Meer, Hermann Abstract: It is widely accepted that the network of the future will require a greater degree of service awareness and optimal use of network resources. This article presents an architectural design for an open software-defined network infrastructure that enables the composition of fast and guaranteed services in an efficient manner and the execution of these services in an adaptive way, taking into account better shared network resources provided by network virtualization. Validation results are provided with special emphasis on service deployment scalability over virtualized network infrastructures. Fri, 30 Dec 2011 18:49:48 GMT http://hdl.handle.net/2117/14387 2011-12-30T18:49:48Z Rubio Loyola, Javier; Galis, A.; Astorga Rivera, José Antonio; Serrat Fernández, Juan; Lefevre, L.; Fischer, Andreas; Paler, A.; de Meer, Hermann no It is widely accepted that the network of the future will require a greater degree of service awareness and optimal use of network resources. This article presents an architectural design for an open software-defined network infrastructure that enables the composition of fast and guaranteed services in an efficient manner and the execution of these services in an adaptive way, taking into account better shared network resources provided by network virtualization. Validation results are provided with special emphasis on service deployment scalability over virtualized network infrastructures. http://hdl.handle.net/2117/14386 Title: A service-centric orchestration protocol for self-organizing autonomic management systems Authors: Rubio Loyola, Javier; Mérida-Campos, Carlos; Serrat Fernández, Juan; Fernandes Macedo, Daniel; Davy, Steven; Movahedi, Zeinab; Pujolle, Guy Abstract: This article presents a service-centric orchestration protocol for self-interested autonomic management systems that supports the coalition formation process in largescale collaborative and competitive environments. It supports environments in which coalition formations are carried out targeting multiple service requests at the same time, and in which the autonomic management systems compete to work in the most appropriate coalition. The protocol exploits the benefits of social networking in favor of manageability and scalability. Its performance is analyzed taking into account crucial aspects of self-organizing systems such as stability and convergence to optimal coalition formation results. Fri, 30 Dec 2011 18:41:34 GMT http://hdl.handle.net/2117/14386 2011-12-30T18:41:34Z Rubio Loyola, Javier; Mérida-Campos, Carlos; Serrat Fernández, Juan; Fernandes Macedo, Daniel; Davy, Steven; Movahedi, Zeinab; Pujolle, Guy no This article presents a service-centric orchestration protocol for self-interested autonomic management systems that supports the coalition formation process in largescale collaborative and competitive environments. It supports environments in which coalition formations are carried out targeting multiple service requests at the same time, and in which the autonomic management systems compete to work in the most appropriate coalition. The protocol exploits the benefits of social networking in favor of manageability and scalability. Its performance is analyzed taking into account crucial aspects of self-organizing systems such as stability and convergence to optimal coalition formation results. http://hdl.handle.net/2117/12962 Title: A game-theoretic multipath routing for video-streaming services over mobile Ad Hoc networks Authors: Aguilar Igartua, Mónica; Cruz Llopis, Luis Javier de la; Carrascal Frías, Víctor; Sanvicente Gargallo, Emilio Abstract: The number of portable devices capable of maintaining wireless communications has increased considerably in the last decade. Such mobile nodes may form a spontaneous self-configured network connected by wireless links to constitute a Mobile Ad Hoc Network (MANET). As the number of mobile end users grows the demand of multimedia services, such as video-streaming, in such networks is envisioned to increase as well. One of the most appropriate video coding technique for MANETs is layered MPEG-2 VBR, which used with a proper multipath routing scheme improves the distribution of video streams. In this article we introduce a proposal called g-MMDSR (game theoretic-Multipath Multimedia Dynamic Source Routing), a cross-layer multipath routing protocol which includes a game theoretic approach to achieve a dynamic selection of the forwarding paths. The proposal seeks to improve the own benefits of the users whilst using the common scarce resources efficiently. It takes into account the importance of the video frames in the decoding process, which outperforms the quality of the received video. Our scheme has proved to enhance the performance of the framework and the experience of the end users. Simulations have been carried out to show the benefits of our proposal under different situations where high interfering traffic and mobility of the nodes are present. Wed, 13 Jul 2011 13:45:38 GMT http://hdl.handle.net/2117/12962 2011-07-13T13:45:38Z Aguilar Igartua, Mónica; Cruz Llopis, Luis Javier de la; Carrascal Frías, Víctor; Sanvicente Gargallo, Emilio no The number of portable devices capable of maintaining wireless communications has increased considerably in the last decade. Such mobile nodes may form a spontaneous self-configured network connected by wireless links to constitute a Mobile Ad Hoc Network (MANET). As the number of mobile end users grows the demand of multimedia services, such as video-streaming, in such networks is envisioned to increase as well. One of the most appropriate video coding technique for MANETs is layered MPEG-2 VBR, which used with a proper multipath routing scheme improves the distribution of video streams. In this article we introduce a proposal called g-MMDSR (game theoretic-Multipath Multimedia Dynamic Source Routing), a cross-layer multipath routing protocol which includes a game theoretic approach to achieve a dynamic selection of the forwarding paths. The proposal seeks to improve the own benefits of the users whilst using the common scarce resources efficiently. It takes into account the importance of the video frames in the decoding process, which outperforms the quality of the received video. Our scheme has proved to enhance the performance of the framework and the experience of the end users. Simulations have been carried out to show the benefits of our proposal under different situations where high interfering traffic and mobility of the nodes are present. http://hdl.handle.net/2117/11909 Title: ATM inverse multiplexing. Fundamentals and Markovian single-server queue analysis for performance evaluation and validation purposes Authors: Aguilar Igartua, Mónica; Postigo Boix, Marcos; García Haro, Juan Abstract: The growing demand of network bandwidth indicates that user access to high speed (i.e. ATM) networks is a key issue. The Inverse Multiplexing for ATM (IMA) is a technology that combines multiple T1/E1 links to support the transparent transmission of ATM cells over one single logical data trunk whose bandwidth is the aggregate of the T1/E1 capacities, minus a small amount due to overhead. That is, it provides high bandwidth by using already deployed WAN infrastructure and at a reasonable cost. Employing this technology, it is possible to dispose of ATM connections with data rates between the T1/E1 (an economical but sometimes too slow option) and T3/E3 ones (with high bandwidth, but expensive for the mass market of users). In this framework, and facing a new technology, it is crucial to have tools (analytical and simulation ones) easy to manipulate that help telecommunication engineers and network planners on the performance evaluation and dimensioning of these systems. In this paper, the fundamentals and major applications of IMA technology are described. Also, the behavior of IMA multiplexers is carefully analyzed and a method to dimension them proposed. An estimate for the Cell Loss Ratio (CLR) and the mean waiting time measured in the IMUX devices are obtained. The analytical study is based on the comparison with a M/D/1 queue system. Even though, we are aware of some weakness of our assumptions, especially concerning the Poisson input traffic, the model is compact, easy to understand and to manipulate, therefore it can be valuable to validate simulation models developed to evaluate IMUX devices under more realistic input traffic patterns. Thu, 17 Mar 2011 11:57:45 GMT http://hdl.handle.net/2117/11909 2011-03-17T11:57:45Z Aguilar Igartua, Mónica; Postigo Boix, Marcos; García Haro, Juan no The growing demand of network bandwidth indicates that user access to high speed (i.e. ATM) networks is a key issue. The Inverse Multiplexing for ATM (IMA) is a technology that combines multiple T1/E1 links to support the transparent transmission of ATM cells over one single logical data trunk whose bandwidth is the aggregate of the T1/E1 capacities, minus a small amount due to overhead. That is, it provides high bandwidth by using already deployed WAN infrastructure and at a reasonable cost. Employing this technology, it is possible to dispose of ATM connections with data rates between the T1/E1 (an economical but sometimes too slow option) and T3/E3 ones (with high bandwidth, but expensive for the mass market of users). In this framework, and facing a new technology, it is crucial to have tools (analytical and simulation ones) easy to manipulate that help telecommunication engineers and network planners on the performance evaluation and dimensioning of these systems. In this paper, the fundamentals and major applications of IMA technology are described. Also, the behavior of IMA multiplexers is carefully analyzed and a method to dimension them proposed. An estimate for the Cell Loss Ratio (CLR) and the mean waiting time measured in the IMUX devices are obtained. The analytical study is based on the comparison with a M/D/1 queue system. Even though, we are aware of some weakness of our assumptions, especially concerning the Poisson input traffic, the model is compact, easy to understand and to manipulate, therefore it can be valuable to validate simulation models developed to evaluate IMUX devices under more realistic input traffic patterns. http://hdl.handle.net/2117/11204 Title: A Proposal for Pricing Substitute Guaranteed Services Authors: Postigo Boix, Marcos; Melus Moreno, José Luis Abstract: This letter proposes a novel and open method for pricing substitute elastic services in a streaming content delivery scenario when their Grade of Service (GoS) is guaranteed. The method forces each Service Provider (SP) to calculate the rate for each substitute service that guarantees the GoS. The price of each service is obtained according to the maximization of a chosen revenue function and the estimation of its demand function. This letter illustrates the method calculating the price of two substitute services with a selected exponential demand function, where the assignation of the prices depend on the maximization of a selected revenue function. Tue, 25 Jan 2011 18:15:00 GMT http://hdl.handle.net/2117/11204 2011-01-25T18:15:00Z Postigo Boix, Marcos; Melus Moreno, José Luis no This letter proposes a novel and open method for pricing substitute elastic services in a streaming content delivery scenario when their Grade of Service (GoS) is guaranteed. The method forces each Service Provider (SP) to calculate the rate for each substitute service that guarantees the GoS. The price of each service is obtained according to the maximization of a chosen revenue function and the estimation of its demand function. This letter illustrates the method calculating the price of two substitute services with a selected exponential demand function, where the assignation of the prices depend on the maximization of a selected revenue function. http://hdl.handle.net/2117/10957 Title: ATM Inverse multiplexing: fundamentals and markovian single-server queue analysis for performance evaluation and validation purposes Authors: Aguilar Igartua, Mónica; Postigo Boix, Marcos; García Haro, Juan Abstract: The growing demand of network bandwidth indicates that user access to high speed (i.e. ATM) networks is a key issue. The Inverse Multiplexing for ATM (IMA) is a technology that combines multiple T1/E1 links to support the transparent transmission of ATM cells over one single logical data trunk whose bandwidth is the aggregate of the T1/E1 capacities, minus a small amount due to overhead. That is, it provides high bandwidth by using already deployed WAN infrastructure and at a reasonable cost. Employing this technology, it is possible to dispose of ATM connections with data rates between the T1/E1 (an economical but sometimes too slow option) and T3/E3 ones (with high bandwidth, but expensive for the mass market of users). In this framework, and facing a new technology, it is crucial to have tools (analytical and simulation ones) easy to manipulate that help telecommunication engineers and network planners on the performance evaluation and dimensioning of these systems. In this paper, the fundamentals and major applications of IMA technology are described. Also, the behavior of IMA multiplexers is carefully analyzed and a method to dimension them proposed. An estimate for the Cell Loss Ratio (CLR) and the mean waiting time measured in the IMUX devices are obtained. The analytical study is based on the comparison with a M/D/1 queue system. Even though, we are aware of some weakness of our assumptions, especially concerning the Poisson input traffic, the model is compact, easy to understand and to manipulate, therefore it can be valuable to validate simulation models developed to evaluate IMUX devices under more realistic input traffic patterns. Tue, 11 Jan 2011 13:34:32 GMT http://hdl.handle.net/2117/10957 2011-01-11T13:34:32Z Aguilar Igartua, Mónica; Postigo Boix, Marcos; García Haro, Juan no The growing demand of network bandwidth indicates that user access to high speed (i.e. ATM) networks is a key issue. The Inverse Multiplexing for ATM (IMA) is a technology that combines multiple T1/E1 links to support the transparent transmission of ATM cells over one single logical data trunk whose bandwidth is the aggregate of the T1/E1 capacities, minus a small amount due to overhead. That is, it provides high bandwidth by using already deployed WAN infrastructure and at a reasonable cost. Employing this technology, it is possible to dispose of ATM connections with data rates between the T1/E1 (an economical but sometimes too slow option) and T3/E3 ones (with high bandwidth, but expensive for the mass market of users). In this framework, and facing a new technology, it is crucial to have tools (analytical and simulation ones) easy to manipulate that help telecommunication engineers and network planners on the performance evaluation and dimensioning of these systems. In this paper, the fundamentals and major applications of IMA technology are described. Also, the behavior of IMA multiplexers is carefully analyzed and a method to dimension them proposed. An estimate for the Cell Loss Ratio (CLR) and the mean waiting time measured in the IMUX devices are obtained. The analytical study is based on the comparison with a M/D/1 queue system. Even though, we are aware of some weakness of our assumptions, especially concerning the Poisson input traffic, the model is compact, easy to understand and to manipulate, therefore it can be valuable to validate simulation models developed to evaluate IMUX devices under more realistic input traffic patterns. http://hdl.handle.net/2117/10189 Title: The AutoI approach for the orchestration of autonomic networks Authors: Macedo, Daniel Fernandes; Movahedi, Zeinab; Rubio Loyola, Javier; Astorga Rivera, José Antonio; Koumoutsos, Giannis; Pujolle, Guy Abstract: Existing services require assurable end to-end quality of service, security and reliability constraints. Therefore, the networks involved in the transport of the data must cooperate to satisfy those constraints. In a next generation Internet, each of those networks may be managed by different entities. Fur thermore, their policies and service level agreements (SLAs) will differ, as well as the autonomic management systems controlling them. In this context, we in the Autonomic Internet (AutoI) consortium propose the Orchestration Plane (OP), which promotes the interaction among different Autonomic Management Systems (AMSs). The OP mediates the communication and negotiation amongAMSs, ensuring that their SLAs and policies meet the requirement needed for the provisioning of the services. It also simplifies the federation of domains and the distribution of new services in virtualised network environments. Tue, 09 Nov 2010 09:44:08 GMT http://hdl.handle.net/2117/10189 2010-11-09T09:44:08Z Macedo, Daniel Fernandes; Movahedi, Zeinab; Rubio Loyola, Javier; Astorga Rivera, José Antonio; Koumoutsos, Giannis; Pujolle, Guy no Existing services require assurable end to-end quality of service, security and reliability constraints. Therefore, the networks involved in the transport of the data must cooperate to satisfy those constraints. In a next generation Internet, each of those networks may be managed by different entities. Fur thermore, their policies and service level agreements (SLAs) will differ, as well as the autonomic management systems controlling them. In this context, we in the Autonomic Internet (AutoI) consortium propose the Orchestration Plane (OP), which promotes the interaction among different Autonomic Management Systems (AMSs). The OP mediates the communication and negotiation amongAMSs, ensuring that their SLAs and policies meet the requirement needed for the provisioning of the services. It also simplifies the federation of domains and the distribution of new services in virtualised network environments. http://hdl.handle.net/2117/8744 Title: Dynamic framework with adaptive contention window and multipath routing for video-streaming services over mobile ad hoc networks Authors: Aguilar Igartua, Mónica; Carrascal Frías, Víctor; Cruz Llopis, Luis Javier de la; Sanvicente Gargallo, Emilio Abstract: The number of portable electronic devices capable of maintaining wireless communications increases day by day. Such mobile nodes may easily self-configure to form a Mobile Ad Hoc Network (MANET) without the help of any established infrastructure. As the number of mobile devices grows, the demand of multimedia services such as video-streaming from these networks is foreseen to increase as well. This paper presents a proposal which seeks to improve the experience of the end users in such environment. The proposal is called dCW-MMDSR (dynamic Contention Window-Multipath Multimedia Dynamic Source Routing), a cross-layer multipath routing protocol which includes techniques to achieve a dynamic assignment of the Contention Window of the IEEE 802.11e MAC level. In addition, it includes multipath routing suitable for layered coded video to improve the performance of the service. The operation is simple and suitable for low capacity wireless devices. Simulations show the benefits under different scenarios. Fri, 03 Sep 2010 12:16:09 GMT http://hdl.handle.net/2117/8744 2010-09-03T12:16:09Z Aguilar Igartua, Mónica; Carrascal Frías, Víctor; Cruz Llopis, Luis Javier de la; Sanvicente Gargallo, Emilio no The number of portable electronic devices capable of maintaining wireless communications increases day by day. Such mobile nodes may easily self-configure to form a Mobile Ad Hoc Network (MANET) without the help of any established infrastructure. As the number of mobile devices grows, the demand of multimedia services such as video-streaming from these networks is foreseen to increase as well. This paper presents a proposal which seeks to improve the experience of the end users in such environment. The proposal is called dCW-MMDSR (dynamic Contention Window-Multipath Multimedia Dynamic Source Routing), a cross-layer multipath routing protocol which includes techniques to achieve a dynamic assignment of the Contention Window of the IEEE 802.11e MAC level. In addition, it includes multipath routing suitable for layered coded video to improve the performance of the service. The operation is simple and suitable for low capacity wireless devices. Simulations show the benefits under different scenarios. http://hdl.handle.net/2117/8323 Title: Technology and market conditions toward a new competitive landscape in the wireless access market Authors: Beltran, Fernando; Gutierrez, Jairo A.; Melus Moreno, José Luis Abstract: This article argues that the wireless telecommunication market is about to witness a shift in business models and market structure as a result of the deployment of new broadband access technologies, spectrum management techniques, policy-based network management, and the drive of new entrants to compete against the incumbents. The article discusses four agents of evolutionary changes: a range of broadband wireless access standards and technologies that are frontrunners in the industry’s efforts to embody the next generation of wireless networks; new provider-customer relationships facilitated through changes in the usual contract patterns that will allow consumers to enter short-term and spot contracts with the new wireless providers; an overview of the current debate on spectrum management; and an explanation of how autonomic communications and policybased management would support the new structure. Finally, the article asserts the necessity for the integration of the heterogeneous technologies that make up this emerging, hybrid wireless landscape, and describes the economic characteristics of a new competitive scenario. Wed, 21 Jul 2010 13:32:22 GMT http://hdl.handle.net/2117/8323 2010-07-21T13:32:22Z Beltran, Fernando; Gutierrez, Jairo A.; Melus Moreno, José Luis no This article argues that the wireless telecommunication market is about to witness a shift in business models and market structure as a result of the deployment of new broadband access technologies, spectrum management techniques, policy-based network management, and the drive of new entrants to compete against the incumbents. The article discusses four agents of evolutionary changes: a range of broadband wireless access standards and technologies that are frontrunners in the industry’s efforts to embody the next generation of wireless networks; new provider-customer relationships facilitated through changes in the usual contract patterns that will allow consumers to enter short-term and spot contracts with the new wireless providers; an overview of the current debate on spectrum management; and an explanation of how autonomic communications and policybased management would support the new structure. Finally, the article asserts the necessity for the integration of the heterogeneous technologies that make up this emerging, hybrid wireless landscape, and describes the economic characteristics of a new competitive scenario. http://hdl.handle.net/2117/7980 Title: Tratamientos de cationizado y de plasma atmosférico sobre algodón, previos a la tintura con colorante reactivo Authors: Patiño Maya, Alejandro; Canal Barnils, Cristina; Rodríguez Sorigué, M. Cristina; Caballero Manresa, Gabriel; Navarro Sentanyes, Antonio; Canal Arias, José Ma Abstract: En el presente trabajo se han evaluado los efectos de tratamiento con plasma de aire, y/o un cationizado con una epihalohidrina a distintas concentraciones, sobre el agotamiento de la tintura de algodón con colorante reactivo. Se demuestra que algunos de estos tratamientos permiten obtener tinturas con muy alto agotamiento de colorante en tejidos de algodón, con las ventajas medioambientales que ello supone. Se reflexiona sobre los posibles grupos funcionales originados por los tratamientos realizados en la superficie de la fibra de algodón, y su influencia en el agotamiento. Fri, 02 Jul 2010 11:44:16 GMT http://hdl.handle.net/2117/7980 2010-07-02T11:44:16Z Patiño Maya, Alejandro; Canal Barnils, Cristina; Rodríguez Sorigué, M. Cristina; Caballero Manresa, Gabriel; Navarro Sentanyes, Antonio; Canal Arias, José Ma no En el presente trabajo se han evaluado los efectos de tratamiento con plasma de aire, y/o un cationizado con una epihalohidrina a distintas concentraciones, sobre el agotamiento de la tintura de algodón con colorante reactivo. Se demuestra que algunos de estos tratamientos permiten obtener tinturas con muy alto agotamiento de colorante en tejidos de algodón, con las ventajas medioambientales que ello supone. Se reflexiona sobre los posibles grupos funcionales originados por los tratamientos realizados en la superficie de la fibra de algodón, y su influencia en el agotamiento.