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- Autonomous wheelchair with a smart driving mode and a Wi-Fi positioning systemPublication . Manjunath, Gurukiran; Pereira, João da SilvaWheelchairs are an important aid that enhances the mobility of people with several types of disabilities. Therefore, there has been considerable research and development on wheelchairs to meet the needs of the disabled. Since the early manual wheelchairs to their more recent electric powered counterparts, advancements have focused on improving autonomy in mobility. Other developments, such as Internet advancements, have developed the concept of the Internet of Things (IoT). This is a promising area that has been studied to enhance the independent operation of the electrical wheelchairs by enabling autonomous navigation and obstacle avoidance. This dissertation describes shortly the design of an autonomous wheelchair of the IPL/IT (Instituto Politécnico de Leiria/Instituto de Telecomunicações) with smart driving features for persons with visual impairments. The objective is to improve the prototype of an intelligent wheelchair. The first prototype of the wheelchair was built to control it by voice, ocular movements, and GPS (Global Positioning System). Furthermore, the IPL/IT wheelchair acquired a remote control feature which could prove useful for persons with low levels of visual impairment. This tele-assistance mode will be helpful to the family of the wheelchair user or, simply, to a health care assistant. Indoor and outdoor positioning systems, with printed directional Wi-Fi antennas, have been deployed to enable a precise location of our wheelchair. The underlying framework for the wheelchair system is the IPL/IT low cost autonomous wheelchair prototype that is based on IoT technology for improved affordability.
- Determinantes do desempenho internacional das empresas portuguesas nos mercados externosPublication . Paiva, Ana Filipa Agostinho Teles e; Crespo, Cátia Claudemira Cordeiro FernandesEste estudo enfatiza a relação que existe entre as empresas portuguesas e o mercado externo. Num universo cada vez mais internacional e global, a procura é cada vez mais exigente, tanto por parte de clientes como de fornecedores. Desta forma, o presente estudo surge, como uma ferramenta para as empresas aferirem qual a influência da atitude da gestão perante o risco, da propensão para inovação, da distância psíquica, da aprendizagem e da experiência internacional das empresas no seu desempenho internacional. Para efeitos empíricos recorreu-se a uma pesquisa através de inquéritos a empresas portuguesas com o objetivo de aprofundar a relação existente entre os fatores determinantes identificados e o desempenho internacional. Este trabalho permitiu detetar diferentes níveis de significância e influência dos determinantes previamente identificados no desempenho internacional das empresas.
