Societal dynamics and older adults' social functioning

Tilburg, T.G. van [Promotor]Broese Van Groenou, M.I. [Promotor

RePos : relative position estimation of UHF-RFID tags for item-level localization

Radio frequency identification (RFID) technology brings tremendous applications in location-based services. Specifically, ultra-high frequency (UHF) RFID tag positioning based on phase (difference) of arrival (PoA/PDoA) has won great attention, due to its better positioning accuracy than signal strength-based methods. In most cases, such as logistics, retailing, and smart inventory management, the relative orders of the objects are much more attractive than absolute positions with centimetre-level accuracy. In this paper, a relative positioning (RePos) approach based on inter-tag distance and direction estimation is proposed. In the RePos positioning system, the measured phases are reconstructed based on unwrapping method. Then the distances from antenna to the tags are calculated using the distance differences of pairs of antenna's positions via a least-squares method. The relative relationships of the tags, including relative distances and angles, are obtained based on the geometry information extracted from PDoA. The experimental results show that the RePos RFID positioning system can realize about 0.28-meter ranging accuracy, and distinguish the levels and columns without ambiguity

Light-weight integration and interoperation of localization systems in IoT

As the ideas and technologies behind the Internet of Things (IoT) take root, a vast array of new possibilities and applications is emerging with the significantly increased number of devices connected to the Internet. Moreover, we are also witnessing the fast emergence of location-based services with an abundant number of localization technologies and solutions with varying capabilities and limitations. We believe that, at this moment in time, the successful integration of these two diverse technologies is mutually beneficial and even essential for both fields. IoT is one of the major fields that can benefit from localization services, and so, the integration of localization systems in the IoT ecosystem would enable numerous new IoT applications. Further, the use of standardized IoT architectures, interaction and information models will permit multiple localization systems to communicate and interoperate with each other in order to obtain better context information and resolve positioning errors or conflicts. Therefore, in this work, we investigate the semantic interoperation and integration of positioning systems in order to obtain the full potential of the localization ecosystem in the context of IoT. Additionally, we also validate the proposed design by means of an industrial case study, which targets fully-automated warehouses utilizing location-aware and interconnected IoT products and systems

TDoA-based outdoor positioning in a public LoRa network

The performance of LoRa Geo-location for outdoor tracking purposes has been evaluated on a public LoRaWAN network. Time Difference of Arrival (TDOA) localization accuracy, probability and update frequency were evaluated for different trajectories (walking, cycling, driving) and LoRa spreading factors. A median accuracy of 200m was obtained and in 90% of the cases the error was less then 480m

National and transnational belonging among Turkish and Moroccan older migrants in the Netherlands: protective against loneliness?

This research investigates how a sense of belonging functions as protective mechanism against loneliness. Inspired by the work of Berry (1980) on acculturation strategies (i.e. integration, assimilation, separation and marginalization), we distinguish migrants who feel a relatively strong or weak sense of belonging to larger society and those who feel a strong or weak belonging to the “own group.” We expect that more national belonging contributes to less loneliness. We add a transnational perspective by arguing that feelings of belonging to the own group can take place in the country of settlement, but can also be transnational, i.e. a feeling of belonging to the country of origin. Transnational belonging can protect against loneliness, as it acknowledges the importance of place attachment. Using data from the Longitudinal Aging Study Amsterdam on older migrants aged 55–66, we employ latent class analysis and find five national belonging clusters, interpretable in terms of Berry’s acculturation strategies. Further analyses reveal mixed evidence: some aspects of transnational belonging vary with belonging to the own group, but other aspects point to a third dimension of belonging. Regression analysis shows that those marginalized are loneliest and that a transnational sense of belonging contributes to more loneliness. We conclude that Berry’s (1980) typology is useful for interpreting older migrants’ national belonging and that a transnational sense of belonging is apparent among older migrants, but needs to be explored further

Construing the cultural other and the self: A Personal Construct analysis of English and Italian perceptions of national character

How we perceive other cultures is arguably of increasing importance in contemporary society, impacting on realms such as international relations, business and tourism. The qualitative research reported in this paper was carried out in the UK and in Italy and adopted a Personal Construct Psychology approach. It aimed to explore intercultural perceptions in a sample of people who had some degree of experience with the ‘other’ culture, and a unique feature of the research is that it asked how those perceptions might be affected if people from both cultures are given access to each other’s perceptions. There was considerable commonality in the perceptions of the English and Italian participants, and each culture envied some of the qualities of the other. However, they initially struggled to accommodate how they were seen by the other and endeavoured to resolve difference by construing at a more superordinate level. The findings also suggest that national identity is rooted in the construing of others’ constructions, achieved through relationship and comparison

Performance comparison of RSS algorithms for indoor localization in large open environments

We develop and benchmark four RSS localisation algorithms where different a priori knowledge is required. The selection of the best algorithm depends on the availability of additional information on path loss exponent and/or transmit power. We compare our algorithms with centroid localization and show that the algorithms provide better results for shadowing on the values not exceeding 6dB. We perform experiments and simulations with Bluetooth Low Energy and LoRaWAN technologies and select the best technology and algorithm for localisation in large open industrial environments

Lonely and excluded: A downward spiral? An investigation in Germany before the COVID-19 Pandemic

Loneliness and the feeling of being excluded from society both arise from the unsatisfied need to belong, and these negative experiences tend to reinforce each other over time, the authors note. The longer people feel lonely, the less they perceive themselves as valued members of society