Alfonso Durán - Academia.edu (original) (raw)

Papers by Alfonso Durán

International Center for Tropical Agriculture eBooks, 1975

The use of current narrowband Private Mobile Radio (PMR) systems, such as Terrestrial Trunked Rad... more The use of current narrowband Private Mobile Radio (PMR) systems, such as Terrestrial Trunked Radio (TETRA) still has significant shortcomings for public safety networks. In disaster situations, for first responder emergency services to communicate more effectively, the exchange of multimedia information (e.g. high-resolution images) could really help. Due to this fact, LTE technology is postulated as the choice for public safety broadband communication systems. In this paper, we examine a proposal based on two-hop links that seeks to reach locations with low or null coverage and to achieve a physical layer improvement. Such a solution is carried out by combining some LTE features provided by the Third Generation Partnership Project (3GPP) with the use of a wearable massive MIMO solution formed by a large textile array directly implemented at the end user.

... w 45 a n 2 Good 4-G711 -PLC -G729 ... G. 113, 2001. [13] John Fitzpatrick, Sean Murphy, John ... more ... w 45 a n 2 Good 4-G711 -PLC -G729 ... G. 113, 2001. [13] John Fitzpatrick, Sean Murphy, John Murphy, "An Approach to Transport Layer Handover of VoIP over WLAN", IEEE consumer Communications and Networking Conference CCNC, January 2006. ...

The 3rd Generation Partnership Project (3GPP) has defined the Narrow-Band Internet of Things (NBI... more The 3rd Generation Partnership Project (3GPP) has defined the Narrow-Band Internet of Things (NBIoT) standard in Long Term Evolution release 13. This paper presents a model of the NB-IoT random-access procedure (RAP) and analyzes and compares its performance allowing decision-making from a system point of view. It includes a fully configurable signal propagation model, and quantifies the number of users camped on a cell and cell and RAP configuration parameters. The paper shows a novel framework to evaluate the RAP proposed in NB-IoT Re1–13 standard with a comprehensive and realistic approach. The contention-based random access is treated considering Msg3 collisions of the RAP instead of the Msgl collisions, where Msgl collisions are treated as a multi-path transmission. This framework includes the machine traffic generation models defined by the 3GPP, the radio transmission effect on the probability of access success, and the random-access (RA) itself. From the foregoing, single-tone and multi-tone transmission performance results have been obtained to show the impact of some parameters that are not typically considered such as the Msg3 transmission mode, Msg3 modulation and coding scheme (MCS), the use of power control mechanisms, and the power ramping step. The results provide interesting information about how these configuration parameters impact on the RAP global performance and insight into its evolution in future systems.

En las redes convergentes inalámbricas, el traspaso horizontal entre distintos puntos de acceso d... more En las redes convergentes inalámbricas, el traspaso horizontal entre distintos puntos de acceso de la red WLAN es una gran fuente de degradación de la calidad de la VoIP y otros servicios conversacionales en tiempo real. Esto es debido a que este tipo de redes no fueron concebidas originalmente para soportar este tipo de servicios, y los traspasos siguen un protocolo "cortar antes de realizar", produciéndose interrupciones en la comunicación motivadas por el tiempo que necesitan los terminales en volver a asociarse a la red. En este artículo se estudia el efecto que tienen el tamaño de la ventana de promediado de la señal, la histéresis variable y el retardo del handover por parecido entre potencia de puntos de acceso de destino sobre el número de traspasos y las caídas de la potencia de señal por debajo del valor de sensibilidad del terminal, causantes principales de las interrupciones en la comunicación, y, con ello, de la degradación de la calidad de las comunicaciones.

2009 39th IEEE Frontiers in Education Conference

This paper analyzes the concerted effort toward the European Higher Education Area, EHEA (“Bologn... more This paper analyzes the concerted effort toward the European Higher Education Area, EHEA (“Bologna process”), and discusses its relevance for the global engineering education community through the case in Spain. Confronted with a Europe-wide 2010 deadline for the EHEA convergence, the implementation in Spain of EHEA-conformant undergraduate degrees started in September 2008. Carlos III of Madrid has migrated 80% of

2012 42nd European Microwave Conference, 2012

ABSTRACT Emerging femtocell networks are conceived to extend radio coverage indoors, giving suppo... more ABSTRACT Emerging femtocell networks are conceived to extend radio coverage indoors, giving support to a high variety of services. In enterprise scenarios, the demand of reliable and accurate indoor Location Based Services (LBS) is gaining momentum. The femtocell network infrastructure can be used to provide location services based on Received Signal Strength Index (RSSI) and fingerprint location techniques. In this paper, an analysis of different propagation models has been carried out to evaluate their suitability for reducing calibration efforts during fingerprint calibration stage. For that purpose, a procedure including both a simulation process and a measurement campaign has been defined. Results obtained will allow adjusting indoor propagation models parameters and evaluating their applicability for reducing calibration effort while improving accuracy in location fingerprint techniques.

Xxv Simposium Nacional De La Union Cientifica Internacional De Radio Xxv Simposium Nacional De La Union Cientifica Internacional De Radio 15 09 2010 17 09 2010 Bilbao Espana, 2010

Long Term Evolution (LTE) has appeared with the aim of improving the performance of 3G networks, ... more Long Term Evolution (LTE) has appeared with the aim of improving the performance of 3G networks, increasing spectral efficiency and peak rates both at downlink and uplink, reducing latency and increasing flexibility of frequency allocation. Therefore, LTE is expected to have a key role in the development of wireless networks and services in the next years, and, of course, in specific dedicated in-building solutions. Due to that fact, an analysis of LTE performance in indoor scenarios in terms of capacity and grade of service is essential, as well as its comparison with other indoor solutions, pointing out the technical challenges derived, and describing and proposing performance assessment rules to be used in LTE deployments.

IEEE Vehicular Technology Magazine, 2016

16©2016ieee ieee vehicular technology magazine | march 2016 march 2016 | ieee vehicular technolog... more 16©2016ieee ieee vehicular technology magazine | march 2016 march 2016 | ieee vehicular technology magazine ||| 87 self-optimization mechanisms. In this context, a framework for contextaware (CA) self-optimization in smallcell environments is described, and a particular self-optimization use case, load balancing (LB), is used to evaluate the benefits of the proposed approach. The results show that the proposed CA-LB algorithms increase the users' satisfaction, while the optimization time is significantly reduced.

Efficient Decision Support Systems - Practice and Challenges From Current to Future, 2011

Efficient Decision Support Systems-Practice and Challenges From Current to Future 184 distributio... more Efficient Decision Support Systems-Practice and Challenges From Current to Future 184 distribution channels through which rooms can be reserved, quota allocation and reallocation to each channel, cancellation procedures and penalizations, pricing process (prices that can only increase as the execution/ arrival date approaches vs. prices that can go either up or down).  The decision variable(s) to be optimized. In a hotel reservation process, the decision to be taken might be when (how long before the actual stay date) to switch from a lower price to a higher price, or alternatively consider this anticipation as a fixed parameter and try to optimize which price to switch to.  The business objective(s) to achieve. In the hotel sector it will typically be profit; given its essentially fixed costs, this translates into managing/ maximizing revenue, hence the "Revenue Management" term. In other service sectors the optimization objective is not so clear, as it is the case of the Health Care sector. Nordgren (2009) discusses the complexity of the multi-faceted concept of value in this sector and thus the number of objectives that should be simultaneously taken into account when trying to find a match between the service providers and the potential users. Although potential benefits to be gained from the use of advanced RM techniques to guide the allocation of infrastructures are substantial, in many cases merely applying the existing algorithms adds limited value. In its thorough literature review on RM research, Chiang et al. (2007) highlight the resulting complexity and difficulty of developing and implementing RM projects, to the point of suggesting that these projects are viewed as strategic, as opposed to tactical activities. There is a barrier to the adoption of RM algorithms, derived from its dependency on the concrete design of the business process. Each service organization uses a different business process design for infrastructure allocations (e.g., the pricing and reservation process in a hotel). These organizations do not want to restrict themselves to predetermined business process designs just to use a specific algorithm. Since the appropriate algorithm is contingent on that design, organizations must tailor their algorithms or redevelop them from scratch. Besides, given the currently prevailing nonsystematic approach to algorithm development, this adaptation requirement, both initially and whenever the business process is redesigned, imposes a stiff hindrance, particularly to the SME, and also limits its adaptability to changing market conditions. The work presented here intends to overcome that barrier, by taking advantage of the flexibility offered by a generic modeling approach to design the model base component of a Revenue Management-based Decision Support System (DSS) aiming at the efficient allocation of the abovementioned non-storable service infrastructures. The Model Base can be identified as the key component in RM DSS according to the definition provided by Sprague. In his classical DSS framework, Sprague distinguishes three main components in a DSS (Sprague, 1980): database, model base and software system. The software system in turn is composed of three components: the DBMS (Database Management Software), which in conjunction with the database constitutes the data subsystem; the MBMS (Model Base Management Software), which in conjunction with the model base constitutes the model subsystem; and the dialog generation and management software which forms the system user interface. The model subsystem is within the scope of a DSS what is frequently referred to as a Model Management System (MMS), which according to Muhanna & Pick (1994) can be defined with wide agreement as "a software system that facilitates the development, storage, manipulation, control, and effective utilization of models in an organization."

Forum Tecnologico Issn 1579 3818 2004 01 Vol N 7, 2004

Figura 1: Distribución del punto de acceso 2 de la 4 a planta del edificio C de la ETSIT.

In enterprise scenarios, multi-femtocell deployments can be carried out to improve indoor service... more In enterprise scenarios, multi-femtocell deployments can be carried out to improve indoor services performance. In this environment, a detailed cell planning can be made in order to optimize network performance. To solve optimization problems in wireless networks, many techniques have been proposed, typically taking the number of base stations to be deployed as an input to the automatic planning process or including them as a fixed cost to assess fitness value. In this paper, a novel genetic algorithm for computer aided optimization of multi-femtocell deployments is presented, assuming that the optimal number of femtocells to fulfill design constraints is unknown. This novel genetic approach is demonstrated using a multi-objective multi-femtocell deployment in a typical enterprise scenario.

Annals of Industrial Engineering 2012, 2013

High quality short-term Hotel Infrastructure Assignment decisions (HIADs) can improve hotel profi... more High quality short-term Hotel Infrastructure Assignment decisions (HIADs) can improve hotel profitability and customer satisfaction. Optimization of HIADs requires addressing two fundamental challenges namely, accurate prediction of customer behaviour and management of interaction complexity and customer reactions. Here, we view the decision environment as a sequence of decisions within the context of customer lifecycles. Each decision is composed of two parts i.e. the hotel´s decision followed by the customer´s decision. We analyze the challenges and conclude that sequential assignment of hotel infrastructure to customers may not be optimal because of limited incorporation of implications of customer reactions in the decision mechanism. Therefore, we need to consider parallel assignment i.e. assignment of hotel infrastructure to the most promising of the likely subsets of potential customers competing for the same time slot. Finally, we discuss a possible data-driven decision support scheme for HIADs that is based on the integration of data mining techniques with micro-simulation.

Journal of Industrial Engineering and Management, 2013

This paper proposes an integrated computer-supported multi-staged approach to the flexible design... more This paper proposes an integrated computer-supported multi-staged approach to the flexible design and multicriteria evaluation of service infrastructure assignment processes/ algorithms. It involves particularizing a metamodel encompassing the main generic components and relationships into process models and process instances, by incorporating structural data from the real-life system. Existing data on the target user population is fed into a micro-modeling system to generate a matching population of individual "virtual" users, each with its own set of trait values. The micro-simulation of their interaction with the assignment process of both the incumbent and the competitors generates a rich multi-dimensional output, encompassing both "revealed" and non-observable data. This enables a comprehensive multi-criteria evaluation of the foreseeable performance of the designed process/ algorithm, and therefore its iterative improvement. This approach thus facilitates, in a multicriteria environment, the flexible modeling/design of situation-specific assignment processes/algorithms and their performance assessment when facing their case-specific user population.

2007 IEEE Radio and Wireless Symposium, 2007

... w 45 a n 2 Good 4-G711 -PLC -G729 ... G. 113, 2001. [13] John Fitzpatrick, Sean Murphy, John ... more ... w 45 a n 2 Good 4-G711 -PLC -G729 ... G. 113, 2001. [13] John Fitzpatrick, Sean Murphy, John Murphy, "An Approach to Transport Layer Handover of VoIP over WLAN", IEEE consumer Communications and Networking Conference CCNC, January 2006. ...

Annals of Industrial Engineering 2012, 2013

In this paper we explore the potential advantages derived from adopting a generalized approach to... more In this paper we explore the potential advantages derived from adopting a generalized approach to enterprise management software development, and particularly to achieving the additional flexibility required to provide efficient support to certain types of infrastructure assignment (IA) problems. Within the OMG metamodeling framework, we follow a modeling generalization process, leading to the design and conceptual definition of an infrastructure assignment reference metamodel. The modeling process is carried out through three methodological steps. Taking a company using an enterprise metamodel-based management system as the starting point, we first incorporate infrastructure assignment functionality to the system and then add support for the design of the assignment process. Finally, we propose an infrastructure assignment metamodel, intended to be the core of an independent decision support system.

International Center for Tropical Agriculture eBooks, 1975

The use of current narrowband Private Mobile Radio (PMR) systems, such as Terrestrial Trunked Rad... more The use of current narrowband Private Mobile Radio (PMR) systems, such as Terrestrial Trunked Radio (TETRA) still has significant shortcomings for public safety networks. In disaster situations, for first responder emergency services to communicate more effectively, the exchange of multimedia information (e.g. high-resolution images) could really help. Due to this fact, LTE technology is postulated as the choice for public safety broadband communication systems. In this paper, we examine a proposal based on two-hop links that seeks to reach locations with low or null coverage and to achieve a physical layer improvement. Such a solution is carried out by combining some LTE features provided by the Third Generation Partnership Project (3GPP) with the use of a wearable massive MIMO solution formed by a large textile array directly implemented at the end user.

... w 45 a n 2 Good 4-G711 -PLC -G729 ... G. 113, 2001. [13] John Fitzpatrick, Sean Murphy, John ... more ... w 45 a n 2 Good 4-G711 -PLC -G729 ... G. 113, 2001. [13] John Fitzpatrick, Sean Murphy, John Murphy, "An Approach to Transport Layer Handover of VoIP over WLAN", IEEE consumer Communications and Networking Conference CCNC, January 2006. ...

The 3rd Generation Partnership Project (3GPP) has defined the Narrow-Band Internet of Things (NBI... more The 3rd Generation Partnership Project (3GPP) has defined the Narrow-Band Internet of Things (NBIoT) standard in Long Term Evolution release 13. This paper presents a model of the NB-IoT random-access procedure (RAP) and analyzes and compares its performance allowing decision-making from a system point of view. It includes a fully configurable signal propagation model, and quantifies the number of users camped on a cell and cell and RAP configuration parameters. The paper shows a novel framework to evaluate the RAP proposed in NB-IoT Re1–13 standard with a comprehensive and realistic approach. The contention-based random access is treated considering Msg3 collisions of the RAP instead of the Msgl collisions, where Msgl collisions are treated as a multi-path transmission. This framework includes the machine traffic generation models defined by the 3GPP, the radio transmission effect on the probability of access success, and the random-access (RA) itself. From the foregoing, single-tone and multi-tone transmission performance results have been obtained to show the impact of some parameters that are not typically considered such as the Msg3 transmission mode, Msg3 modulation and coding scheme (MCS), the use of power control mechanisms, and the power ramping step. The results provide interesting information about how these configuration parameters impact on the RAP global performance and insight into its evolution in future systems.

En las redes convergentes inalámbricas, el traspaso horizontal entre distintos puntos de acceso d... more En las redes convergentes inalámbricas, el traspaso horizontal entre distintos puntos de acceso de la red WLAN es una gran fuente de degradación de la calidad de la VoIP y otros servicios conversacionales en tiempo real. Esto es debido a que este tipo de redes no fueron concebidas originalmente para soportar este tipo de servicios, y los traspasos siguen un protocolo "cortar antes de realizar", produciéndose interrupciones en la comunicación motivadas por el tiempo que necesitan los terminales en volver a asociarse a la red. En este artículo se estudia el efecto que tienen el tamaño de la ventana de promediado de la señal, la histéresis variable y el retardo del handover por parecido entre potencia de puntos de acceso de destino sobre el número de traspasos y las caídas de la potencia de señal por debajo del valor de sensibilidad del terminal, causantes principales de las interrupciones en la comunicación, y, con ello, de la degradación de la calidad de las comunicaciones.

2009 39th IEEE Frontiers in Education Conference

This paper analyzes the concerted effort toward the European Higher Education Area, EHEA (“Bologn... more This paper analyzes the concerted effort toward the European Higher Education Area, EHEA (“Bologna process”), and discusses its relevance for the global engineering education community through the case in Spain. Confronted with a Europe-wide 2010 deadline for the EHEA convergence, the implementation in Spain of EHEA-conformant undergraduate degrees started in September 2008. Carlos III of Madrid has migrated 80% of

2012 42nd European Microwave Conference, 2012

ABSTRACT Emerging femtocell networks are conceived to extend radio coverage indoors, giving suppo... more ABSTRACT Emerging femtocell networks are conceived to extend radio coverage indoors, giving support to a high variety of services. In enterprise scenarios, the demand of reliable and accurate indoor Location Based Services (LBS) is gaining momentum. The femtocell network infrastructure can be used to provide location services based on Received Signal Strength Index (RSSI) and fingerprint location techniques. In this paper, an analysis of different propagation models has been carried out to evaluate their suitability for reducing calibration efforts during fingerprint calibration stage. For that purpose, a procedure including both a simulation process and a measurement campaign has been defined. Results obtained will allow adjusting indoor propagation models parameters and evaluating their applicability for reducing calibration effort while improving accuracy in location fingerprint techniques.

Xxv Simposium Nacional De La Union Cientifica Internacional De Radio Xxv Simposium Nacional De La Union Cientifica Internacional De Radio 15 09 2010 17 09 2010 Bilbao Espana, 2010

Long Term Evolution (LTE) has appeared with the aim of improving the performance of 3G networks, ... more Long Term Evolution (LTE) has appeared with the aim of improving the performance of 3G networks, increasing spectral efficiency and peak rates both at downlink and uplink, reducing latency and increasing flexibility of frequency allocation. Therefore, LTE is expected to have a key role in the development of wireless networks and services in the next years, and, of course, in specific dedicated in-building solutions. Due to that fact, an analysis of LTE performance in indoor scenarios in terms of capacity and grade of service is essential, as well as its comparison with other indoor solutions, pointing out the technical challenges derived, and describing and proposing performance assessment rules to be used in LTE deployments.

IEEE Vehicular Technology Magazine, 2016

16©2016ieee ieee vehicular technology magazine | march 2016 march 2016 | ieee vehicular technolog... more 16©2016ieee ieee vehicular technology magazine | march 2016 march 2016 | ieee vehicular technology magazine ||| 87 self-optimization mechanisms. In this context, a framework for contextaware (CA) self-optimization in smallcell environments is described, and a particular self-optimization use case, load balancing (LB), is used to evaluate the benefits of the proposed approach. The results show that the proposed CA-LB algorithms increase the users' satisfaction, while the optimization time is significantly reduced.

Efficient Decision Support Systems - Practice and Challenges From Current to Future, 2011

Efficient Decision Support Systems-Practice and Challenges From Current to Future 184 distributio... more Efficient Decision Support Systems-Practice and Challenges From Current to Future 184 distribution channels through which rooms can be reserved, quota allocation and reallocation to each channel, cancellation procedures and penalizations, pricing process (prices that can only increase as the execution/ arrival date approaches vs. prices that can go either up or down).  The decision variable(s) to be optimized. In a hotel reservation process, the decision to be taken might be when (how long before the actual stay date) to switch from a lower price to a higher price, or alternatively consider this anticipation as a fixed parameter and try to optimize which price to switch to.  The business objective(s) to achieve. In the hotel sector it will typically be profit; given its essentially fixed costs, this translates into managing/ maximizing revenue, hence the "Revenue Management" term. In other service sectors the optimization objective is not so clear, as it is the case of the Health Care sector. Nordgren (2009) discusses the complexity of the multi-faceted concept of value in this sector and thus the number of objectives that should be simultaneously taken into account when trying to find a match between the service providers and the potential users. Although potential benefits to be gained from the use of advanced RM techniques to guide the allocation of infrastructures are substantial, in many cases merely applying the existing algorithms adds limited value. In its thorough literature review on RM research, Chiang et al. (2007) highlight the resulting complexity and difficulty of developing and implementing RM projects, to the point of suggesting that these projects are viewed as strategic, as opposed to tactical activities. There is a barrier to the adoption of RM algorithms, derived from its dependency on the concrete design of the business process. Each service organization uses a different business process design for infrastructure allocations (e.g., the pricing and reservation process in a hotel). These organizations do not want to restrict themselves to predetermined business process designs just to use a specific algorithm. Since the appropriate algorithm is contingent on that design, organizations must tailor their algorithms or redevelop them from scratch. Besides, given the currently prevailing nonsystematic approach to algorithm development, this adaptation requirement, both initially and whenever the business process is redesigned, imposes a stiff hindrance, particularly to the SME, and also limits its adaptability to changing market conditions. The work presented here intends to overcome that barrier, by taking advantage of the flexibility offered by a generic modeling approach to design the model base component of a Revenue Management-based Decision Support System (DSS) aiming at the efficient allocation of the abovementioned non-storable service infrastructures. The Model Base can be identified as the key component in RM DSS according to the definition provided by Sprague. In his classical DSS framework, Sprague distinguishes three main components in a DSS (Sprague, 1980): database, model base and software system. The software system in turn is composed of three components: the DBMS (Database Management Software), which in conjunction with the database constitutes the data subsystem; the MBMS (Model Base Management Software), which in conjunction with the model base constitutes the model subsystem; and the dialog generation and management software which forms the system user interface. The model subsystem is within the scope of a DSS what is frequently referred to as a Model Management System (MMS), which according to Muhanna & Pick (1994) can be defined with wide agreement as "a software system that facilitates the development, storage, manipulation, control, and effective utilization of models in an organization."

Forum Tecnologico Issn 1579 3818 2004 01 Vol N 7, 2004

Figura 1: Distribución del punto de acceso 2 de la 4 a planta del edificio C de la ETSIT.

In enterprise scenarios, multi-femtocell deployments can be carried out to improve indoor service... more In enterprise scenarios, multi-femtocell deployments can be carried out to improve indoor services performance. In this environment, a detailed cell planning can be made in order to optimize network performance. To solve optimization problems in wireless networks, many techniques have been proposed, typically taking the number of base stations to be deployed as an input to the automatic planning process or including them as a fixed cost to assess fitness value. In this paper, a novel genetic algorithm for computer aided optimization of multi-femtocell deployments is presented, assuming that the optimal number of femtocells to fulfill design constraints is unknown. This novel genetic approach is demonstrated using a multi-objective multi-femtocell deployment in a typical enterprise scenario.

Annals of Industrial Engineering 2012, 2013

High quality short-term Hotel Infrastructure Assignment decisions (HIADs) can improve hotel profi... more High quality short-term Hotel Infrastructure Assignment decisions (HIADs) can improve hotel profitability and customer satisfaction. Optimization of HIADs requires addressing two fundamental challenges namely, accurate prediction of customer behaviour and management of interaction complexity and customer reactions. Here, we view the decision environment as a sequence of decisions within the context of customer lifecycles. Each decision is composed of two parts i.e. the hotel´s decision followed by the customer´s decision. We analyze the challenges and conclude that sequential assignment of hotel infrastructure to customers may not be optimal because of limited incorporation of implications of customer reactions in the decision mechanism. Therefore, we need to consider parallel assignment i.e. assignment of hotel infrastructure to the most promising of the likely subsets of potential customers competing for the same time slot. Finally, we discuss a possible data-driven decision support scheme for HIADs that is based on the integration of data mining techniques with micro-simulation.

Journal of Industrial Engineering and Management, 2013

This paper proposes an integrated computer-supported multi-staged approach to the flexible design... more This paper proposes an integrated computer-supported multi-staged approach to the flexible design and multicriteria evaluation of service infrastructure assignment processes/ algorithms. It involves particularizing a metamodel encompassing the main generic components and relationships into process models and process instances, by incorporating structural data from the real-life system. Existing data on the target user population is fed into a micro-modeling system to generate a matching population of individual "virtual" users, each with its own set of trait values. The micro-simulation of their interaction with the assignment process of both the incumbent and the competitors generates a rich multi-dimensional output, encompassing both "revealed" and non-observable data. This enables a comprehensive multi-criteria evaluation of the foreseeable performance of the designed process/ algorithm, and therefore its iterative improvement. This approach thus facilitates, in a multicriteria environment, the flexible modeling/design of situation-specific assignment processes/algorithms and their performance assessment when facing their case-specific user population.

2007 IEEE Radio and Wireless Symposium, 2007

... w 45 a n 2 Good 4-G711 -PLC -G729 ... G. 113, 2001. [13] John Fitzpatrick, Sean Murphy, John ... more ... w 45 a n 2 Good 4-G711 -PLC -G729 ... G. 113, 2001. [13] John Fitzpatrick, Sean Murphy, John Murphy, "An Approach to Transport Layer Handover of VoIP over WLAN", IEEE consumer Communications and Networking Conference CCNC, January 2006. ...

Annals of Industrial Engineering 2012, 2013

In this paper we explore the potential advantages derived from adopting a generalized approach to... more In this paper we explore the potential advantages derived from adopting a generalized approach to enterprise management software development, and particularly to achieving the additional flexibility required to provide efficient support to certain types of infrastructure assignment (IA) problems. Within the OMG metamodeling framework, we follow a modeling generalization process, leading to the design and conceptual definition of an infrastructure assignment reference metamodel. The modeling process is carried out through three methodological steps. Taking a company using an enterprise metamodel-based management system as the starting point, we first incorporate infrastructure assignment functionality to the system and then add support for the design of the assignment process. Finally, we propose an infrastructure assignment metamodel, intended to be the core of an independent decision support system.