Alfredo Perez - Academia.edu (original) (raw)

Papers by Alfredo Perez

ChemInform, 2000

Skip to Main Content. Due to scheduled maintenance access to the Wiley Online Library may be disr... more Skip to Main Content. Due to scheduled maintenance access to the Wiley Online Library may be disrupted as follows: Saturday, 16 October - New York 0700 EDT to 0900 EDT; London 1200 BST to 1400 BST; Singapore 1900 SGT to 2100 SGT. ...

Journal of Heterocyclic Chemistry, 2000

Skip to Main Content. Due to scheduled maintenance access to the Wiley Online Library may be disr... more Skip to Main Content. Due to scheduled maintenance access to the Wiley Online Library may be disrupted as follows: Saturday, 16 October - New York 0700 EDT to 0900 EDT; London 1200 BST to 1400 BST; Singapore 1900 SGT to 2100 SGT. ...

International Conference on Mobile Ubiquitous Computing, Systems, Services and Technologies, 2008

Advanced location based services have the ability to track users with Global Positioning System (... more Advanced location based services have the ability to track users with Global Positioning System (GPS)-enabled cell phones in real-time. These applications share a common problem; the continuous calculation and transmission of GPS fixes from the mobile phone to a server consumes a considerable amount of energy and increases data transmission costs. Therefore, an application-level algorithm is necessary to reduce the number of GPS fixes calculated and transmitted, while continuing to track the user in real-time and record an accurate representation of his or her travel path. In this paper, two complementary algorithms are presented: the critical point (CP) algorithm, which filters data points to be transmitted to the server, and the location-aware state machine, which dynamically manages the frequency of the location re-calculation update rate. Both algorithms were implemented in TRAC-IT, a Java Micro Edition (Java ME) application designed to automatically collect user travel behavior; the proposed algorithms allow TRAC-IT to build an accurate representation of the user's path with a considerably reduced number of fixes while significantly extending mobile device battery life.

2011 IEEE Wireless Communications and Networking Conference, 2011

Abstract This paper presents a multiobjective model for the simultaneous optimization of the numb... more Abstract This paper presents a multiobjective model for the simultaneous optimization of the number of relays and the energy dissipation when deploying a wireless sensor networks to monitor specific locations in an area. In order to solve the model, a hybrid evolutionary algorithm with two local searches is proposed an implemented. As the algorithm returns a set of efficient solutions, the tradeoff among placements in their number of relays with their energy dissipation is explored. The evaluation shows that the energy can be diminished ...

Chapman & Hall/CRC Computer & Information Science Series, 2010

Transportation Research Record, 2007

International Conference on Mobile Ubiquitous Computing, Systems, Services and Technologies, 2008

Advanced location based services have the ability to track users with Global Positioning System (... more Advanced location based services have the ability to track users with Global Positioning System (GPS)-enabled cell phones in real-time. These applications share a common problem; the continuous calculation and transmission of GPS fixes from the mobile phone to a server consumes a considerable amount of energy and increases data transmission costs. Therefore, an application-level algorithm is necessary to reduce the number of GPS fixes calculated and transmitted, while continuing to track the user in real-time and record an accurate representation of his or her travel path. In this paper, two complementary algorithms are presented: the critical point (CP) algorithm, which filters data points to be transmitted to the server, and the location-aware state machine, which dynamically manages the frequency of the location re-calculation update rate. Both algorithms were implemented in TRAC-IT, a Java Micro Edition (Java ME) application designed to automatically collect user travel behavior; the proposed algorithms allow TRAC-IT to build an accurate representation of the user's path with a considerably reduced number of fixes while significantly extending mobile device battery life.

2011 IEEE Wireless Communications and Networking Conference, 2011

Abstract This paper presents a multiobjective model for the simultaneous optimization of the numb... more Abstract This paper presents a multiobjective model for the simultaneous optimization of the number of relays and the energy dissipation when deploying a wireless sensor networks to monitor specific locations in an area. In order to solve the model, a hybrid evolutionary algorithm with two local searches is proposed an implemented. As the algorithm returns a set of efficient solutions, the tradeoff among placements in their number of relays with their energy dissipation is explored. The evaluation shows that the energy can be diminished ...

Chapman & Hall/CRC Computer & Information Science Series, 2010

Transportation Research Record, 2007

International Conference on Mobile Ubiquitous Computing, Systems, Services and Technologies, 2008

Advanced location based services have the ability to track users with Global Positioning System (... more Advanced location based services have the ability to track users with Global Positioning System (GPS)-enabled cell phones in real-time. These applications share a common problem; the continuous calculation and transmission of GPS fixes from the mobile phone to a server consumes a considerable amount of energy and increases data transmission costs. Therefore, an application-level algorithm is necessary to reduce the number of GPS fixes calculated and transmitted, while continuing to track the user in real-time and record an accurate representation of his or her travel path. In this paper, two complementary algorithms are presented: the critical point (CP) algorithm, which filters data points to be transmitted to the server, and the location-aware state machine, which dynamically manages the frequency of the location re-calculation update rate. Both algorithms were implemented in TRAC-IT, a Java Micro Edition (Java ME) application designed to automatically collect user travel behavior; the proposed algorithms allow TRAC-IT to build an accurate representation of the user's path with a considerably reduced number of fixes while significantly extending mobile device battery life.

International Conference on Mobile Ubiquitous Computing, Systems, Services and Technologies, 2008

Advanced location based services have the ability to track users with Global Positioning System (... more Advanced location based services have the ability to track users with Global Positioning System (GPS)-enabled cell phones in real-time. These applications share a common problem; the continuous calculation and transmission of GPS fixes from the mobile phone to a server consumes a considerable amount of energy and increases data transmission costs. Therefore, an application-level algorithm is necessary to reduce the number of GPS fixes calculated and transmitted, while continuing to track the user in real-time and record an accurate representation of his or her travel path. In this paper, two complementary algorithms are presented: the critical point (CP) algorithm, which filters data points to be transmitted to the server, and the location-aware state machine, which dynamically manages the frequency of the location re-calculation update rate. Both algorithms were implemented in TRAC-IT, a Java Micro Edition (Java ME) application designed to automatically collect user travel behavior; the proposed algorithms allow TRAC-IT to build an accurate representation of the user's path with a considerably reduced number of fixes while significantly extending mobile device battery life.

2011 IEEE Wireless Communications and Networking Conference, 2011

Abstract This paper presents a multiobjective model for the simultaneous optimization of the numb... more Abstract This paper presents a multiobjective model for the simultaneous optimization of the number of relays and the energy dissipation when deploying a wireless sensor networks to monitor specific locations in an area. In order to solve the model, a hybrid evolutionary algorithm with two local searches is proposed an implemented. As the algorithm returns a set of efficient solutions, the tradeoff among placements in their number of relays with their energy dissipation is explored. The evaluation shows that the energy can be diminished ...

2011 IEEE Wireless Communications and Networking Conference, 2011

Abstract This paper presents a multiobjective model for the simultaneous optimization of the numb... more Abstract This paper presents a multiobjective model for the simultaneous optimization of the number of relays and the energy dissipation when deploying a wireless sensor networks to monitor specific locations in an area. In order to solve the model, a hybrid evolutionary algorithm with two local searches is proposed an implemented. As the algorithm returns a set of efficient solutions, the tradeoff among placements in their number of relays with their energy dissipation is explored. The evaluation shows that the energy can be diminished ...

Chapman & Hall/CRC Computer & Information Science Series, 2010

Chapman & Hall/CRC Computer & Information Science Series, 2010

Transportation Research Record, 2007

ChemInform, 2000

Skip to Main Content. Due to scheduled maintenance access to the Wiley Online Library may be disr... more Skip to Main Content. Due to scheduled maintenance access to the Wiley Online Library may be disrupted as follows: Saturday, 16 October - New York 0700 EDT to 0900 EDT; London 1200 BST to 1400 BST; Singapore 1900 SGT to 2100 SGT. ...

Journal of Heterocyclic Chemistry, 2000

Skip to Main Content. Due to scheduled maintenance access to the Wiley Online Library may be disr... more Skip to Main Content. Due to scheduled maintenance access to the Wiley Online Library may be disrupted as follows: Saturday, 16 October - New York 0700 EDT to 0900 EDT; London 1200 BST to 1400 BST; Singapore 1900 SGT to 2100 SGT. ...

International Conference on Mobile Ubiquitous Computing, Systems, Services and Technologies, 2008

Advanced location based services have the ability to track users with Global Positioning System (... more Advanced location based services have the ability to track users with Global Positioning System (GPS)-enabled cell phones in real-time. These applications share a common problem; the continuous calculation and transmission of GPS fixes from the mobile phone to a server consumes a considerable amount of energy and increases data transmission costs. Therefore, an application-level algorithm is necessary to reduce the number of GPS fixes calculated and transmitted, while continuing to track the user in real-time and record an accurate representation of his or her travel path. In this paper, two complementary algorithms are presented: the critical point (CP) algorithm, which filters data points to be transmitted to the server, and the location-aware state machine, which dynamically manages the frequency of the location re-calculation update rate. Both algorithms were implemented in TRAC-IT, a Java Micro Edition (Java ME) application designed to automatically collect user travel behavior; the proposed algorithms allow TRAC-IT to build an accurate representation of the user's path with a considerably reduced number of fixes while significantly extending mobile device battery life.

2011 IEEE Wireless Communications and Networking Conference, 2011

Abstract This paper presents a multiobjective model for the simultaneous optimization of the numb... more Abstract This paper presents a multiobjective model for the simultaneous optimization of the number of relays and the energy dissipation when deploying a wireless sensor networks to monitor specific locations in an area. In order to solve the model, a hybrid evolutionary algorithm with two local searches is proposed an implemented. As the algorithm returns a set of efficient solutions, the tradeoff among placements in their number of relays with their energy dissipation is explored. The evaluation shows that the energy can be diminished ...

Chapman & Hall/CRC Computer & Information Science Series, 2010

Transportation Research Record, 2007

International Conference on Mobile Ubiquitous Computing, Systems, Services and Technologies, 2008

Advanced location based services have the ability to track users with Global Positioning System (... more Advanced location based services have the ability to track users with Global Positioning System (GPS)-enabled cell phones in real-time. These applications share a common problem; the continuous calculation and transmission of GPS fixes from the mobile phone to a server consumes a considerable amount of energy and increases data transmission costs. Therefore, an application-level algorithm is necessary to reduce the number of GPS fixes calculated and transmitted, while continuing to track the user in real-time and record an accurate representation of his or her travel path. In this paper, two complementary algorithms are presented: the critical point (CP) algorithm, which filters data points to be transmitted to the server, and the location-aware state machine, which dynamically manages the frequency of the location re-calculation update rate. Both algorithms were implemented in TRAC-IT, a Java Micro Edition (Java ME) application designed to automatically collect user travel behavior; the proposed algorithms allow TRAC-IT to build an accurate representation of the user's path with a considerably reduced number of fixes while significantly extending mobile device battery life.

2011 IEEE Wireless Communications and Networking Conference, 2011

Abstract This paper presents a multiobjective model for the simultaneous optimization of the numb... more Abstract This paper presents a multiobjective model for the simultaneous optimization of the number of relays and the energy dissipation when deploying a wireless sensor networks to monitor specific locations in an area. In order to solve the model, a hybrid evolutionary algorithm with two local searches is proposed an implemented. As the algorithm returns a set of efficient solutions, the tradeoff among placements in their number of relays with their energy dissipation is explored. The evaluation shows that the energy can be diminished ...

Chapman & Hall/CRC Computer & Information Science Series, 2010

Transportation Research Record, 2007

International Conference on Mobile Ubiquitous Computing, Systems, Services and Technologies, 2008

Advanced location based services have the ability to track users with Global Positioning System (... more Advanced location based services have the ability to track users with Global Positioning System (GPS)-enabled cell phones in real-time. These applications share a common problem; the continuous calculation and transmission of GPS fixes from the mobile phone to a server consumes a considerable amount of energy and increases data transmission costs. Therefore, an application-level algorithm is necessary to reduce the number of GPS fixes calculated and transmitted, while continuing to track the user in real-time and record an accurate representation of his or her travel path. In this paper, two complementary algorithms are presented: the critical point (CP) algorithm, which filters data points to be transmitted to the server, and the location-aware state machine, which dynamically manages the frequency of the location re-calculation update rate. Both algorithms were implemented in TRAC-IT, a Java Micro Edition (Java ME) application designed to automatically collect user travel behavior; the proposed algorithms allow TRAC-IT to build an accurate representation of the user's path with a considerably reduced number of fixes while significantly extending mobile device battery life.

International Conference on Mobile Ubiquitous Computing, Systems, Services and Technologies, 2008

Advanced location based services have the ability to track users with Global Positioning System (... more Advanced location based services have the ability to track users with Global Positioning System (GPS)-enabled cell phones in real-time. These applications share a common problem; the continuous calculation and transmission of GPS fixes from the mobile phone to a server consumes a considerable amount of energy and increases data transmission costs. Therefore, an application-level algorithm is necessary to reduce the number of GPS fixes calculated and transmitted, while continuing to track the user in real-time and record an accurate representation of his or her travel path. In this paper, two complementary algorithms are presented: the critical point (CP) algorithm, which filters data points to be transmitted to the server, and the location-aware state machine, which dynamically manages the frequency of the location re-calculation update rate. Both algorithms were implemented in TRAC-IT, a Java Micro Edition (Java ME) application designed to automatically collect user travel behavior; the proposed algorithms allow TRAC-IT to build an accurate representation of the user's path with a considerably reduced number of fixes while significantly extending mobile device battery life.

2011 IEEE Wireless Communications and Networking Conference, 2011

Abstract This paper presents a multiobjective model for the simultaneous optimization of the numb... more Abstract This paper presents a multiobjective model for the simultaneous optimization of the number of relays and the energy dissipation when deploying a wireless sensor networks to monitor specific locations in an area. In order to solve the model, a hybrid evolutionary algorithm with two local searches is proposed an implemented. As the algorithm returns a set of efficient solutions, the tradeoff among placements in their number of relays with their energy dissipation is explored. The evaluation shows that the energy can be diminished ...

2011 IEEE Wireless Communications and Networking Conference, 2011

Abstract This paper presents a multiobjective model for the simultaneous optimization of the numb... more Abstract This paper presents a multiobjective model for the simultaneous optimization of the number of relays and the energy dissipation when deploying a wireless sensor networks to monitor specific locations in an area. In order to solve the model, a hybrid evolutionary algorithm with two local searches is proposed an implemented. As the algorithm returns a set of efficient solutions, the tradeoff among placements in their number of relays with their energy dissipation is explored. The evaluation shows that the energy can be diminished ...

Chapman & Hall/CRC Computer & Information Science Series, 2010

Chapman & Hall/CRC Computer & Information Science Series, 2010

Transportation Research Record, 2007