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- Simulation tools for wireless sensor networks in medicine: a comparative studyPublication . Neves, Paulo Alexandre; Fonseca, Joel; Rodrigues, JoelThis paper presents a study on three simulation tools for Wireless Sensor Nertworks (WSNs): Network Simulator 2 (ns-2), Java Simulator (J-Sim) and Sensor Network Emulator and Simulator (SENSE). We present the concept of WSNs, each simulator in terms of its features, a view on current applications of WSNs on medicine and a comparative study on the simulators studied. We conclude that SENSE presents the better approach for WSNs.
- G-Jsim: A GUI tool for wireless sensor networks simulation under J-SimPublication . Neves, Paulo Alexandre; Veiga, Iúri D.C.; Rodrigues, JoelA Wireless Sensor Network is composed of up to thousands of smart sensing nodes with processing unit and memory, sensing unit and wireless communication capabilities. Wireless Sensor Networks application spans from the military applications into almost every field we can think of. Several simulation tools are readily available, among them the J-Sim, a java-based simulator with growing interest by research and network developers alike. We propose to enhance J-Sim functionality with a Guided User Interface for Wireless Sensor Networks that dramatically increases the user-friendliness of the simulator. Also, we provide a free download web page for everyone to benefit.
- Using a hardware coprocessor for message scheduling in fieldbus-based distributed systemsPublication . Fonseca, José A.; Martins, Ernesto V.; Neves, Paulo AlexandreFieldbus based distributed embedded systems used in real-time applications tend to be inflexible in what concerns changing operational parameters on-line. Recent techniques such as the planning scheduler can avoid this problem but do not show adequate responsiveness f o r automatic negotiation of parameter values. In this paper the use of ASIC based coprocessors f o r message scheduling is proposed to solve the problem. Such coprocessors can be used in the arbiter nodes of systems based on widely used producer-consumer fieldbuses like WorldFIP and CAN. A prototype built with a Xilinx FPGA is presented. First performance results are shown and analyzed. They demonstrate that the device is able to achieve the expected performance and also point to the possibility of evolution to an almost dynamic scheduling approach.
- Aplicação para detetar e corrigir a postura em exercícios físicosPublication . Gonçalves, João; Palhares, João; Soares, V.N.G.J.; Neves, Paulo AlexandreNo ritmo acelerado da vida moderna a prática regular de exercício físico emerge como fonte de vitalidade e bem-estar. No entanto nem sempre é possível a deslocação ao ginásio e/ou pagar a um treinador pessoal. A opção por exercícios sem equipamentos usando o peso do corpo é apelativa pelos benefícios e baixo custo, mas podem surgir lesões pela sua má execução, nomeadamente devido a postura incorreta. Este trabalho apresenta uma abordagem para permitir, utilizando técnicas de visão computacional, detectar que exercício o praticante está a executar e analisar a postura, sem necessidade de intervenção de uma terceira pessoa. Os principais contributos deste artigo são: 1) Desenvolvimento de um dataset robusto para deteção de 3 exercícios de ginástica diferentes, 2) Avaliação do desempenho do modelo YOLOv8, bem como alguns dos seus diferentes níveis, usando o dataset desenvolvido; 3) Criação de um protótipo de aplicação para detetar um exercício e corrigir a realização do mesmo por parte dos utilizadores. O principal objetivo é fornecer aos utilizadores uma forma de facilitar a realização de atividade física, em qualquer lugar, sem a necessidade de acompanhamento especial ou equipamentos externos, sendo ao mesmo tempo um adjuvante para garantir que não ocorrem lesões por má postura.
- A survey on IP-based wireless sensor networks solutionsPublication . Rodrigues, Joel; Neves, Paulo AlexandreWireless sensor networks can be composed of thousands of smart sensing nodes that capture environment data in a cost-efficient way. Such networks present new challenges when compared to traditional computer networks, namely in terms of smart node processing power and very limited energy resources. Ubiquitous computing can benefit from wireless sensor networks, from the perspective that sensed data can be used on behalf of the user without explicit intervention, turning ubiquitous computing into a reality. For the data to be available everywhere wireless sensor networks must be connected to the Internet. Two main approaches can be considered: proxy-based or sensor node stack based. This second approach turns sensors into data producing hosts, also know as ”The Internet of Things”. For years the TCP/IP protocol suite was considered inappropriate for wireless sensor networks, mainly due to the inherent complexity and protocol overhead for such limited hardware. However, recent studies made connecting wireless sensor to the Internet possible for integration on the future Internet. This paper surveys the current state-of-the-art on the connection of wireless sensor networks to the Internet, presents related achievements, and provides insights on how to develop Internet Protocol-based communication solutions for wireless sensor networks today.
- A first approach towards pervasive computing using current tools: a real examplePublication . Neves, Paulo Alexandre; Luz, Nuno; Proença, RicardoThe paper presents the real implementation of a system that empowers the traveling professional through the use of current tools and mobile platforms. A book selling system was developed and deployed in a server together with Pocket PC 2003 enabled PDA systems. The global vision of such systems is given and the current implementation is also presented.
- A biosensor and data presentation solution for body sensor networksPublication . Neves, Paulo Alexandre; Caldeira, J.M.L.P.; Mendes, Américo; Pereira, Orlando; Rodrigues, JoelA Body Sensor Network can sense health parameters directly on the patient’s body, allowing 24/7 monitoring in an unobtrusive way. Several tiny sensors collect and route data to a special sink node. A new intra-vaginal biosensor was developed to study the relation between temperature variations and women health conditions, such as ovulation period, among others. We present a biosensor prototype and some initial results on real scenarios with a woman. One of the main issues in a body sensor network is the transformation of the sensor raw data into meaningful medical data for medical staff. Several approaches exist, from mobile device-based approaches to more powerful hardware such as a personal computer. This paper presents our current work in body sensor networks, namely a prototype for intra-vaginal temperature monitoring with initial results, and a mobile tool for data presentation of a three-tier body sensor network. The gathered results demonstrate the feasibility of the approach, contributing to the widespread application of body sensor networks.
- MP-Collaborator: a mobile collaboration tool in pervasive environmentPublication . Silva, Bruno M.; Neves, Paulo Alexandre; Denko, Mieso K.; Rodrigues, JoelIn modern organizations, the communication between collaborators is essential to improve productivity. There is a need for mobile collaboration tools that allow efficient collaboration among staff in organization which may be located in different geographical areas and time zones. Mobile and pervasive computing provides easy and convenient access to information, enabling effective collaboration. This paper describes a context and location-aware mobile application, called MP-Collaborator, created to improve and optimize the communication between collaborators in any organization. MP- Collaborator draws information from location, user status and Pocket Outlook Calendar to create a user availability profile, which is published to any other user in the network. Based on availability status, the user can be reached using a simple phone call or a message. Through the opportunistic use of available mobile technologies MP-Collaborator provides a simple but critical service - user presence service. The proposed solution is validated both in terms of features and communication through a series of experiments on real devices through Wi-Fi network.
- Past, present and future of IP telephonyPublication . Soares, V.N.G.J.; Neves, Paulo Alexandre; Rodrigues, JoelSince the late 90's IP telephony, commonly referred to as Voice over IP (VoIP), has been presented as a revolution on communications enabling the possibility to converge historically separated voice and data networks, reducing costs, and integrating voice, data and video on applications. This paper presents a study over the standard VoIP protocols H.323, Session Initiation Protocol (SIP), Media Gateway Control Protocol (MGCP), and H.248/Megaco. Given the fact that H.323 and SIP are more widespread than the others, we focus our study on them. For each of these protocols we describe and discuss its main capabilities, architecture, stack protocol, and characteristics. We also briefly point their technical limitations. Furthermore, we present the Advanced Multimedia System (AMS) project, a new system that aims to operate on Next Generation Networks (NGN) taking the advantage of its features, and it is viewed as the successor to H.323 and SIP.
- G-Sense: a graphical interface for SENSE simulatorPublication . Rosa, Pedro M.P.; Neves, Paulo Alexandre; Vaidya, Binod; Rodrigues, JoelWireless sensor networks greatly benefit from simulation before deployment, since some of these networks may contain thousands of nodes. The new challenges compared to traditional computer networks led to several approaches for network simulation, namely SENSE – Sensor Network Emulator and Simulator. However this approach presents a limited user interface, namely based on text, forcing users to have knowledge on C++ programming language. This paper presents a tool, called G-Sense, that greatly improves SENSE user friendliness, with graphical input of simulation parameters, save and load simulation features, and simulation results management with plot view. This new tool uses SENSE simulation engine in a transparent way, so the user may be focused on the simulation itself, not in the underlying simulation tool. We present G-Sense architecture, usability and extensive experiments for its validation. We believe that this tool will contribute for SENSE adoption for wireless sensor network simulation, clearly improving on its ease of use.
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