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Prof. Dr. Nuno Cruz
Department of Electronics and Telecommunications and Computer Engineering, Instituto Politécnico de Lisboa, 1500-335 Lisbon, Portugal

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Research Keywords & Expertise

0 Internet of Things
0 Mobile Computing
0 Smart Cities
0 Cybersecurity
0 intelligent transportation systems

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Mobile Computing

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Short Biography

Nuno Cruz received a PhD degree with a thesis on collaborative computing between mobile devices from the University of Lisbon. He is currently an adjunct professor at Instituto Superior de Engenharia de Lisboa of Instituto Politécnico de Lisboa. He is currently an integrated researcher at the Large-Scale Informatics Systems Laboratory. He collaborated in several projects with the industry mainly on computer networks-related topics. His current research interests include mobile computing, mobility prediction, networking (IoT-LPWAN, IP, 5G, G5), railway communications, smart cities, and intelligent transport systems.

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Journal article
Published: 18 March 2021 in Sensors
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The city of Lisbon, as any other capital of a European country, has a large number of issues regarding managing waste and recycling containers spread throughout the city. This document presents the results of a study promoted by the Lisbon City Council for trialing LPWAN (Low-Power Wide-Area Network) technology for the waste management vertical under the Lisbon Smart City initiative. Current waste management is done using GSM (Global System for Mobile communications) sensors, and the municipality aims to use LPWAN in order to improve range and reduce costs and provisioning times when changing the communications provider. After an initial study, LoRa (Long Range) and LoRAWAN (LoRa Wide Area Network) as its network counterpart, were selected as the LPWAN technology for trials considering several use cases, exploring multiple distances, types of recycling waste containers, placements (underground or surface) and kinds of commercially available waste level measurement LoRa sensors. The results showed that the underground waste containers proved to be, as expected, the most difficult to operate correctly, where the container itself imposed attenuation levels of 26 dB on the LoRa link budget. The successful results were used to promote the deployment of a city-wide LoRa network, available to all the departments inside the Lisbon City Council. Considering the network capacity, the municipality also decided to make the network freely available to citizens.

ACS Style

Nuno Cruz; Nuno Cota; João Tremoceiro. LoRaWAN and Urban Waste Management—A Trial. Sensors 2021, 21, 2142 .

AMA Style

Nuno Cruz, Nuno Cota, João Tremoceiro. LoRaWAN and Urban Waste Management—A Trial. Sensors. 2021; 21 (6):2142.

Chicago/Turabian Style

Nuno Cruz; Nuno Cota; João Tremoceiro. 2021. "LoRaWAN and Urban Waste Management—A Trial." Sensors 21, no. 6: 2142.

Preprint
Published: 16 February 2021
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The city of Lisbon, has any other capital of a European country, has a large number of issues while managing the waste and recycling containers spread throughout the city. This document presents the results of a study promoted by the Lisbon City Council for trialing LPWAN technology on the waste management vertical under the Lisbon Smart City initiative. Current waste management is done using GSM sensors, and the aim is to use LPWAN to reduce the costs, improve range and reduce provisioning times when changing the communications provider. After an initial study, LoRa was selected as the LPWAN of choice for the trials. The study is composed of multiple use cases at different distances, types of recycling waste containers, placements (underground and surface) and different kinds of waste level measurement LoRa sensors, deployed in order to assess the impact of the different use cases on the LoRa sensor usage. The results shown that the underground waste containers present the most difficult challenge, where the container itself imposes attenuation levels of 26dB on the link budget. The results promoted the deployment of a city wide LoRa network available to all departments inside the Lisbon City Council, and considering the network capacity the network, the network is also available to citizens to be used freely.

ACS Style

Nuno Cruz; Nuno Cota; João Tremoceiro. LoRaWAN and Urban Waste Management – A Trial. 2021, 1 .

AMA Style

Nuno Cruz, Nuno Cota, João Tremoceiro. LoRaWAN and Urban Waste Management – A Trial. . 2021; ():1.

Chicago/Turabian Style

Nuno Cruz; Nuno Cota; João Tremoceiro. 2021. "LoRaWAN and Urban Waste Management – A Trial." , no. : 1.

Journal article
Published: 08 July 2019 in Electronics
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This work presents the efforts on optimizing energy consumption by deploying an energy management system using the current IoT component/system/platform integration trends through a layered architecture. LoBEMS (LoRa Building and Energy Management System), the proposed platform, was built with the mindset of proving a common platform that would integrate multiple vendor locked-in systems together with custom sensor devices, providing critical data in order to improve overall building efficiency. The actions that led to the energy savings were implemented with a ruleset that would control the already installed air conditioning and lighting control systems. This approach was validated in a kindergarten school during a three-year period, resulting in a publicly available dataset that is useful for future and related research. The sensors that feed environmental data to the custom energy management system are composed by a set of battery operated sensors tied to a System on Chip with a LoRa communication interface. These sensors acquire environmental data such as temperature, humidity, luminosity, air quality but also motion. An already existing energy monitoring solution was also integrated. This flexible approach can easily be deployed to any building facility, including buildings with existing solutions, without requiring any remote automation facilities. The platform includes data visualization templates that create an overall dashboard, allowing management to identify actions that lead to savings using a set of pre-defined actions or even a manual mode if desired. The integration of the multiple systems (air-conditioning, lighting and energy monitoring) is a key differentiator of the proposed solution, especially when the top energy consumers for modern buildings are cooling and heating systems. As an outcome, the evaluation of the proposed platform resulted in a 20% energy saving based on these combined energy saving actions.

ACS Style

Bruno Mataloto; Joao C. Ferreira; Nuno Cruz. LoBEMS—IoT for Building and Energy Management Systems. Electronics 2019, 8, 763 .

AMA Style

Bruno Mataloto, Joao C. Ferreira, Nuno Cruz. LoBEMS—IoT for Building and Energy Management Systems. Electronics. 2019; 8 (7):763.

Chicago/Turabian Style

Bruno Mataloto; Joao C. Ferreira; Nuno Cruz. 2019. "LoBEMS—IoT for Building and Energy Management Systems." Electronics 8, no. 7: 763.

Journal article
Published: 20 November 2017 in IEEE Transactions on Mobile Computing
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The capability to anticipate a contact with another device can contribute to improve the performance and user satisfaction of mobile social network applications and of any other relying on some form of data harvesting or hoarding. This paper presents a 9 year data set of wireless access logs produced by more than 70000 devices and 40000 users. Research on the recurring contact patterns observed between groups of devices permitted to model the probabilities of occurrence of a contact at a predefined date between pairs of devices. As an example, the paper presents and evaluates an algorithm that provides daily contact predictions, based on the history of past pairwise contacts and its application on a reputation service.

ACS Style

Nuno Cruz; Hugo Miranda. Recurring Contacts between Groups of Devices: Analysis and Application. IEEE Transactions on Mobile Computing 2017, 17, 1666 -1679.

AMA Style

Nuno Cruz, Hugo Miranda. Recurring Contacts between Groups of Devices: Analysis and Application. IEEE Transactions on Mobile Computing. 2017; 17 (7):1666-1679.

Chicago/Turabian Style

Nuno Cruz; Hugo Miranda. 2017. "Recurring Contacts between Groups of Devices: Analysis and Application." IEEE Transactions on Mobile Computing 17, no. 7: 1666-1679.

Journal article
Published: 13 July 2015 in ICST Transactions on Ubiquitous Environments
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ACS Style

Nuno Cruz; Hugo Miranda. MobIPLity: A trace-based mobility scenario generator for mobile applications. ICST Transactions on Ubiquitous Environments 2015, 2, 1 .

AMA Style

Nuno Cruz, Hugo Miranda. MobIPLity: A trace-based mobility scenario generator for mobile applications. ICST Transactions on Ubiquitous Environments. 2015; 2 (5):1.

Chicago/Turabian Style

Nuno Cruz; Hugo Miranda. 2015. "MobIPLity: A trace-based mobility scenario generator for mobile applications." ICST Transactions on Ubiquitous Environments 2, no. 5: 1.

Conference paper
Published: 01 January 2015 in Proceedings of the 12th EAI International Conference on Mobile and Ubiquitous Systems: Computing, Networking and Services
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ACS Style

Nuno Cruz; Hugo Miranda. Recurring contact opportunities within groups of devices. Proceedings of the 12th EAI International Conference on Mobile and Ubiquitous Systems: Computing, Networking and Services 2015, 1 .

AMA Style

Nuno Cruz, Hugo Miranda. Recurring contact opportunities within groups of devices. Proceedings of the 12th EAI International Conference on Mobile and Ubiquitous Systems: Computing, Networking and Services. 2015; ():1.

Chicago/Turabian Style

Nuno Cruz; Hugo Miranda. 2015. "Recurring contact opportunities within groups of devices." Proceedings of the 12th EAI International Conference on Mobile and Ubiquitous Systems: Computing, Networking and Services , no. : 1.

Conference paper
Published: 01 March 2014 in 2014 IEEE International Conference on Pervasive Computing and Communication Workshops (PERCOM WORKSHOPS)
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The emergence of smartphones with Wireless LAN (WiFi) network interfaces brought new challenges to application developers. The expected increase of users connectivity will impact their expectations for example on the performance of background applications. Unfortunately, the number and breadth of the studies on the new patterns of user mobility and connectivity that result from the emergence of smartphones is still insufficient to support this claim. This paper contributes with preliminary results on a large scale study of the usage pattern of about 49000 devices and 31000 users who accessed at least one access point of the eduroam WiFi network on the campuses of the Lisbon Polytechnic Institute. Results confirm that the increasing number of smartphones resulted in significant changes to the pattern of use, with impact on the amount of traffic and users connection time.

ACS Style

Nuno Cruz; Hugo Miranda; Pedro Ribeiro. The evolution of user mobility on the eduroam network. 2014 IEEE International Conference on Pervasive Computing and Communication Workshops (PERCOM WORKSHOPS) 2014, 249 -253.

AMA Style

Nuno Cruz, Hugo Miranda, Pedro Ribeiro. The evolution of user mobility on the eduroam network. 2014 IEEE International Conference on Pervasive Computing and Communication Workshops (PERCOM WORKSHOPS). 2014; ():249-253.

Chicago/Turabian Style

Nuno Cruz; Hugo Miranda; Pedro Ribeiro. 2014. "The evolution of user mobility on the eduroam network." 2014 IEEE International Conference on Pervasive Computing and Communication Workshops (PERCOM WORKSHOPS) , no. : 249-253.

Conference paper
Published: 01 March 2014 in 2014 IEEE International Conference on Pervasive Computing and Communication Workshops (PERCOM WORKSHOPS)
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Although the computational power of mobile devices has been increasing, it is still not enough for some classes of applications. In the present, these applications delegate the computing power burden on servers located on the Internet. This model assumes an always-on Internet connectivity and implies a non-negligible latency. The thesis addresses the challenges and contributions posed to the application of a mobile collaborative computing environment concept to wireless networks. The goal is to define a reference architecture for high performance mobile applications. Current work is focused on efficient data dissemination on a highly transitive environment, suitable to many mobile applications and also to the reputation and incentive system available on this mobile collaborative computing environment. For this we are improving our already published reputation/incentive algorithm with knowledge from the usage pattern from the eduroam wireless network in the Lisbon area.

ACS Style

Nuno Cruz. Mobile collaborative cloudless computing. 2014 IEEE International Conference on Pervasive Computing and Communication Workshops (PERCOM WORKSHOPS) 2014, 184 -186.

AMA Style

Nuno Cruz. Mobile collaborative cloudless computing. 2014 IEEE International Conference on Pervasive Computing and Communication Workshops (PERCOM WORKSHOPS). 2014; ():184-186.

Chicago/Turabian Style

Nuno Cruz. 2014. "Mobile collaborative cloudless computing." 2014 IEEE International Conference on Pervasive Computing and Communication Workshops (PERCOM WORKSHOPS) , no. : 184-186.

Conference paper
Published: 01 January 2014 in Proceedings of the 11th International Conference on Mobile and Ubiquitous Systems: Computing, Networking and Services
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ACS Style

Nuno Cruz; Hugo Miranda. MobIPLity: A trace-based mobility scenario generator for mobile applications. Proceedings of the 11th International Conference on Mobile and Ubiquitous Systems: Computing, Networking and Services 2014, 1 .

AMA Style

Nuno Cruz, Hugo Miranda. MobIPLity: A trace-based mobility scenario generator for mobile applications. Proceedings of the 11th International Conference on Mobile and Ubiquitous Systems: Computing, Networking and Services. 2014; ():1.

Chicago/Turabian Style

Nuno Cruz; Hugo Miranda. 2014. "MobIPLity: A trace-based mobility scenario generator for mobile applications." Proceedings of the 11th International Conference on Mobile and Ubiquitous Systems: Computing, Networking and Services , no. : 1.

Conference paper
Published: 01 September 2013 in 2013 Seventh International Conference on Next Generation Mobile Apps, Services and Technologies
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Allowing a mobile device to provide a service to the neighbouring peers carries non-negligible risks, of which confidentiality, privacy and selfishness are good examples. To discourage selfishness, two approaches are typically taken: i) in trade based systems, devices agree on a retribution for the execution of a task, ii) in trust based systems rogue devices are detected and announced by their peers. We show that in some scenarios found in wireless mobile networks both present sub-optimal results. The paper describes and evaluates a hybrid service, combining trade and trust-based characteristics. The service suits well privacy requirements as it assumes and encourages users to frequently change their pseudonyms. The paper shows that the service detects several misbehaving approaches, even without requiring interacting devices to be connected to the Internet.

ACS Style

Nuno Cruz; Hugo Miranda. A Hybrid Trust and Trade Service for Mobile Collaborative Computing. 2013 Seventh International Conference on Next Generation Mobile Apps, Services and Technologies 2013, 1 -6.

AMA Style

Nuno Cruz, Hugo Miranda. A Hybrid Trust and Trade Service for Mobile Collaborative Computing. 2013 Seventh International Conference on Next Generation Mobile Apps, Services and Technologies. 2013; ():1-6.

Chicago/Turabian Style

Nuno Cruz; Hugo Miranda. 2013. "A Hybrid Trust and Trade Service for Mobile Collaborative Computing." 2013 Seventh International Conference on Next Generation Mobile Apps, Services and Technologies , no. : 1-6.

Conference paper
Published: 01 July 2013 in 2013 12th IEEE International Conference on Trust, Security and Privacy in Computing and Communications
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In less than a decade, smartphones and mobile applications spread like wildfire and dramatically improved aspects of our professional and private lives, from efficiency to safety. However, these applications are still in their infancy and mostly provide mobile versions of online Internet services or arcade games. With the exception of simple location-based query applications, context-awareness is largely ignored. However, it is not hard to imagine advanced mobile social networking applications -- SNAPPs for short -- that could proactively assist users in everyday tasks, improving their quality of life. Such services would require massive data collection, processing and communication between mobile devices. Unfortunately, the current centralised communication paradigm represents a major barrier to such intense networking. In this paper, we claim that a fundamental paradigm shift in communication is required to allow such application to see the light of day. The paper claims that such a shift is possible and that it resides in moving towards decentralised communication by taking advantage of the largely untapped network, storage and processing power capabilities offered by idle mobile devices. The paper presents and discusses a number of research questions that must be addressed in order to achieve this paradigm shift.

ACS Style

Yann Busnel; Nuno Cruz; Denis Gillet; Adrian Holzer; Hugo Miranda. Reinventing Mobile Community Computing and Communication. 2013 12th IEEE International Conference on Trust, Security and Privacy in Computing and Communications 2013, 1450 -1457.

AMA Style

Yann Busnel, Nuno Cruz, Denis Gillet, Adrian Holzer, Hugo Miranda. Reinventing Mobile Community Computing and Communication. 2013 12th IEEE International Conference on Trust, Security and Privacy in Computing and Communications. 2013; ():1450-1457.

Chicago/Turabian Style

Yann Busnel; Nuno Cruz; Denis Gillet; Adrian Holzer; Hugo Miranda. 2013. "Reinventing Mobile Community Computing and Communication." 2013 12th IEEE International Conference on Trust, Security and Privacy in Computing and Communications , no. : 1450-1457.