Browsing AQU Faculty Members Dissertations by Title
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- ItemChildren with spina bifida and their mothers in Palestine(Printed in Gothenburg, Sweden 2019 Printed by BrandFactory, 2019-04-11) Nahal, Maha SABSTRACT The overall aim in this thesis was to describe the lived experiences of children with spina bifida (SB) and their mothers while living under specific social and cultural conditions in West Bank, Palestine. A further aim was to gain knowledge about the impact of SB on self-perceived health and sense of coherence (SOC) among a group of children and adolescents with SB in comparison to their healthy peers. Study I and II involved narrative interviews with 20 mothers and 10 children, respectively, which were analysed with the phenomenological-hermeneutical method. Study III and IV involved selfreported questionnaires. The Pediatric Quality of Life Inventory (PedsQLTM 4.0) was used in Study III to assess self-perceived health in 50 children with SB in comparison with 150 healthy children. In Study IV, the PedsQLTM 4.0 and SOC scales were used to assess self-perceived health and SOC in 50 adolescents with SB in comparison with 150 healthy adolescents. The association between self-perceived health, SOC and levels of impairment in children and adolescents with SB was also investigated. The findings in this thesis show that children with SB, their mothers and other family members were struggling with negative sociocultural beliefs about the disability. Stigmatisation, political conflict and consequent poor health care services were shaping the daily life experiences of the children and their families. The lack of knowledge about health care needs of the child with SB had a true effect upon the mothers’ well-being, and increased their burden. Children with SB were struggling with social exclusion and seemed to possess a negative self-concept. Children and adolescents with SB perceived their health to be worse than the health of their peers. SOC was lower in adolescents with SB than it was in their healthy peers. Levels of impairment in mobility and hydrocephaly associated negatively with self-perceived health in children and adolescents with SB, while bladder dysfunction was negatively associated with SOC only among the adolescents. In conclusion, stakeholders, policy makers, health care providers and educators in Palestine must be aware of the extent of the burden and suffering experienced by children with SB and their families. Health promotion and social support for this group of children and their families can be achieved through the development and implementation of effective policies and strategies, such as a family-centred care (FCC) approach, within health care systems and rehabilitative practices in the Palestinian context.
- ItemDiscovery and Group Communication for Constrained Internet of Things Devices using the Constrained Application Protocol(Ghent University, 2015) Ishaq, IsamThe ubiquitous Internet is rapidly spreading to new domains. This expansion of the Internet is comparable in scale to the spread of the Internet in the ’90s. The resulting Internet is now commonly referred to as the Internet of Things (IoT) and is expected to connect about 50 billion devices by the year 2020. This means that in just five years from the time of writing this PhD the number of interconnected devices will exceed the number of humans by sevenfold. It is further expected that the majority of these IoT devices will be resource constrained embedded devices such as sensors and actuators. Sensors collect information about the physical world and inject this information into the virtual world. Next processing and reasoning can occur and decisions can be taken to enact upon the physical world by injecting feedback to actuators. The integration of embedded devices into the Internet introduces new challenges, since many of the existing Internet technologies and protocols were not designed for this class of constrained devices. These devices are typically optimized for low cost and power consumption and thus have very limited power, memory, and processing resources and have long sleep periods. The networks formed by these embedded devices are also constrained and have different characteristics than those typical in todays Internet. These constrained networks have high packet loss, low throughput, frequent topology changes and small useful payload sizes. They are referred to as LLN. Therefore, it is in most cases unfeasible to run standard Internet protocols on this class of constrained devices and/or LLNs. New or adapted protocols that take into consideration the capabilities of the constrained devices and the characteristics of LLNs, are required. In the past few years, there were many efforts to enable the extension of the Internet technologies to constrained devices. Initially, most of these efforts were focusing on the networking layer. However, the expansion of the Internet in the 90s was not due to introducing new or better networking protocols. It was a result of introducing the World Wide Web (WWW), which made it easy to integrate services and applications. One of the essential technologies underpinning the WWW was the Hypertext Transfer Protocol (HTTP). Today, HTTP has become a key protocol in the realization of scalable web services building around the Representational State Transfer (REST) paradigm. The REST architectural style enables the realization of scalable and well-performing services using uniform and simple interfaces. The availability of an embedded counterpart of HTTP and the REST architecture could boost the uptake of the IoT. Therefore, more recently, work started to allow the integration of constrained devices in the Internet at the service level. The Internet Engineering Task Force (IETF) Constrained RESTful Environments (CoRE) working group has realized the REST architecture in a suitable form for the most constrained nodes and networks. To that end the Constrained Application Protocol (CoAP) was introduced, a specialized RESTful web transfer protocol for use with constrained networks and nodes. CoAP realizes a subset of the REST mechanisms offered by HTTP, but is optimized for Machine-to-Machine (M2M) applications. This PhD research builds upon CoAP to enable a better integration of constrained devices in the IoT and examines proposed CoAP solutions theoretically and experimentally proposing alternatives when appropriate. The first part of this PhD proposes a mechanism that facilitates the deployment of sensor networks and enables the discovery, end-to-end connectivity and service usage of newly deployed sensor nodes. The proposed approach makes use of CoAP and combines it with Domain Name System (DNS) in order to enable the use of userfriendly Fully Qualified Domain Names (FQDNs) for addressing sensor nodes. It includes the automatic discovery of sensors and sensor gateways and the translation of HTTP to CoAP, thus making the sensor resources globally discoverable and accessible from any Internet-connected client using either IPv6 addresses or DNS names both via HTTP or CoAP. As such, the proposed approach provides a feasible and flexible solution to achieve hierarchical self-organization with a minimum of pre-configuration. By doing so we minimize costly human interventions and eliminate the need for introducing new protocols dedicated for the discovery and organization of resources. This reduces both cost and the implementation footprint on the constrained devices. The second, larger, part of this PhD focuses on using CoAP to realize communication with groups of resources. In many IoT application domains, sensors or actuators need to be addressed as groups rather than individually, since individual resources might not be sufficient or useful. A simple example is that all lights in a room should go on or off as a result of the user toggling the light switch. As not all IoT applications may need group communication, the CoRE working group did not include it in the base CoAP specification. This way the base protocol is kept as efficient and as simple as possible so it would run on even the most constrained devices. Group communication and other features that might not be needed by all devices are standardized in a set of optional separate extensions. We first examined the proposed CoAP extension for group communication, which utilizes Internet Protocol version 6 (IPv6) multicasts. We highlight its strengths and weaknesses and propose our own complementary solution that uses unicast to realize group communication. Our solution offers capabilities beyond simple group communication. For example, we provide a validation mechanism that performs several checks on the group members, to make sure that combining them together is possible. We also allow the client to request that results of the individual members are processed before they are sent to the client. For example, the client can request to obtain only the maximum value of all individual members. Another important optional extension to CoAP allows clients to continuously observe resources by registering their interest in receiving notifications from CoAP servers once there are changes to the values of the observed resources. By using this publish/subscribe mechanism the client does not need to continuously poll the resource to find out whether it has changed its value. This typically leads to more efficient communication patterns that preserve valuable device and LLN resources. Unfortunately CoAP observe does not work together with the CoAP group communication extension, since the observe extension assumes unicast communication while the group communication extension only support multicast communication. In this PhD we propose to extend our own group communication solution to offer group observation capabilities. By combining group observation with group processing features, it becomes possible to notify the client only about certain changes to the observed group (e.g., the maximum value of all group members has changed). Acknowledging that the use of multicast as well as unicast has strengths and weaknesses we propose to extend our unicast based solution with certain multicast features. By doing so we try to combine the strengths of both approaches to obtain a better overall group communication that is flexible and that can be tailored according to the use case needs. Together, the proposed mechanisms represent a powerful and comprehensive solution to the challenging problem of group communication with constrained devices. We have evaluated the solutions proposed in this PhD extensively and in a variety of forms. Where possible, we have derived theoretical models and have conducted numerous simulations to validate them. We have also experimentally evaluated those solutions and compared them with other proposed solutions using a small demo box and later on two large scale wireless sensor testbeds and under different test conditions. The first testbed is located in a large, shielded room, which allows testing under controlled environments. The second testbed is located inside an operational office building and thus allows testing under normal operation conditions. Those tests revealed performance issues and some other problems. We have provided some solutions and suggestions for tackling those problems. Apart from the main contributions, two other relevant outcomes of this PhD are described in the appendices. In the first appendix we review the most important IETF standardization efforts related to the IoT and show that with the introduction of CoAP a complete set of standard protocols has become available to cover the complete networking stack and thus making the step from the IoT into the Web of Things (WoT). Using only standard protocols makes it possible to integrate devices from various vendors into one bigWoT accessible to humans and machines alike. In the second appendix, we provide an alternative solution for grouping constrained devices by using virtualization techniques. Our approach focuses on the objects, both resource-constrained and non-constrained, that need to cooperate by integrating them into a secured virtual network, named an Internet of Things Virtual Network or IoT-VN. Inside this IoT-VN full end-to-end communication can take place through the use of protocols that take the limitations of the most resource-constrained devices into account. We describe how this concept maps to several generic use cases and, as such, can constitute a valid alternative approach for supporting selected applications.
- ItemThe Impact of the Separation Wall on the Social Capital of the Palestinians in East Jerusalem and the West Bank(University of Trento, 2016-04-03) Dhaher, Safa HusniThis doctoral thesis is about the study of the social capital, its effects on the local development and on the socio-economic resilience of the Palestinians trapped, socially, politically, and economically, in the East Jerusalem's al-'Eizariyah area. The transformation of al-'Eizariyah since 2002 through the Israeli encroachment on Palestinian land by instrumental use of the Separation Wall policies were analyzed and re-stated through the lenses of the sociological theory and concepts. Based on the accounts of life stories and interviews with various members of the al-'Eizariyah's former and current community and through the visual data of the changes in al-'Eizariyah and the areas adjacent to the Separation Wall an analysis of the Palestinian coping and survival strategies was undertaken. The thesis demonstrates how the reality of al-'Eizariyah was changed dramatically in the last two decades despite and in the opposite direction of the Oslo Accords of 1993. To be sure, al-‘Eizariyah, which is located two miles east of Jerusalem, had expanded to adjust to the economic boom of the early post-Oslo years coupled with the political expectations of it being part of the future Palestinian capital. This was disrupted by the failure of the Oslo Accords, and the construction of the Israeli Separation Wall in 2002, which served as an instrument of intimidation and harassment to make Palestinians leave Jerusalem, as this thesis demonstrates. The Wall did not only cut off al-'Eizariyah from the main road that used to connect East Jerusalem to Jericho. The Wall's more sinister and long-term damage has been in the physical and psychological isolation of al-‘Eizariyah and in preventing its residents from being fully integrated in the economic, social, cultural, and political life of the East Jerusalem and of the West Bank. This two-sided effect of the Separation Wall started when most of the people who used to work in East Jerusalem and Israel lost their Jobs, students could no longer study in Jerusalem and had to change schools; the sick no longer could use the healthcare facilities, etc. Former residents of al-'Eizariyah could no longer do any of these basic necessities neither their shopping and entertainment in Jerusalem freely without being humiliated with denial of access to Jerusalem based on the persons' ability to present a Blue ID at the checkpoint, the only ID that is recognized by the Israeli regime. While some social capital forms helped in coping with the difficulties caused by this new reality it was the difference in the pre- and post-Wall situations that were examined in order to understand the impact of the adversity represented by the Wall on the social capital of the Palestinians. The purpose of this thesis is to demonstrate the implications of the construction of the Wall on the socio-economic life of al-‘Eizariyah residents and to study the Israel-Palestine conflict from sociological lens using a case study setting and qualitative analysis approach. This thesis demonstrates positive impact of the Wall on social capital types by where the bonding social capital became stronger yet the trend got reversed. At the community level, the challenges were too large to be handled only by bonding social capital. Therefore, there is a combined effort between the Palestinian Authority (PA) and the local civil society associations and the private sector to overcome problems related to education, health care services, trade and labor in addition to social security caused by the Wall. It was found that bridging social capital and linking social capital were strongly present after the Wall was completed. Although civil society associations are strongly present in al-‘Eizariyah but because the Palestinian society is structured along patrimonial, familial, clannish, tribal and contradictory geographical cleavages, most of these associations work in a way that transformed the intended outcome of bridging social capital to some kind of bonding social capital as the beneficiaries and the participants are mostly from their family, clan members, or those who belong to the same political party, and not the community as a whole. However, observations and the empirical evidence show that bonding is stronger than bridging social capital. The social fragmentation caused by several social forces such as the local-stranger relationship, between the locals of al-‘Eizariyah and the displaced residents, prevented efficient cooperation in solving community problems. Lack of the sense of belonging is not only because the locals always express superiority over the displaced, but also because the displaced themselves do not want to lose their rooted original identity, especially the refugees who settled in the town after the 1948 war. This had a great overall impact on the unity of the Palestinian society especially that ‘the refugees’ communities constitute approximately 42 percent of the total population of the West Bank. The future challenge of the Palestinians in areas such as al-‘Eizariyah is to find ways of detecting defragmentation and manipulation policies and develop strategies that would prevent defragmentation of the Palestinians being orchestrated by the Israeli Wall policies and that only become apparent with a time lapse when it can be too late.