Relations between social support, appraisal and coping and both positive and negative outcomes for children of a parent with multiple sclerosis and comparisons with children of healthy parents

Objective: To examine adjustment in children of a parent with multiple sclerosis within a stress and coping framework and compare them with those who have 'healthy' parents. Subjects: A total of 193 participants between 10 and 25 years completed questionnaires; 48 youngsters who had a parent with multiple sclerosis and 145 youngsters who reported that they did not have a parent with an illness or disability. Method: A questionnaire survey methodology was used. Variable sets included caregiving context (e.g. additional parental illness, family responsibilities, parental functional impairment, choice in helping), social support (network size, satisfaction), stress appraisal, coping (problem solving, seeking support, acceptance, wishful thinking, denial), and positive (life satisfaction, positive affect, benefits) and negative (distress, health) adjustment outcomes. Results: Caregiving context variables significantly correlated with poorer adjustment in children of a parent with multiple sclerosis included additional parental illness, higher family responsibilities, parental functional impairment and unpredictability of the parent's multiple sclerosis, and less choice in helping. As predicted, better adjustment in children of a parent with multiple sclerosis was related to higher levels of social support, lower stress appraisals, greater reliance on approach coping strategies (problem solving, seeking support and acceptance) and less reliance on avoidant coping (wishful thinking and denial). Compared with children of 'healthy' parents, children of a parent with multiple sclerosis reported greater family responsibilities, less reliance on problem solving and seeking social support coping, higher somatization and lower life satisfaction and positive affect. Conclusions: Findings delineate the key impacts of young caregiving and support a stress and coping model of adjustment in children of a parent with multiple sclerosis.

Application of IEEE 802.16 mesh networks as the backhaul of multihop cellular networks

Cellular networks have been widely used to support many new audio-and video-based multimedia applications. The demand for higher data rate and diverse services has driven the research on multihop cellular networks (MCNs). With its ad hoc network features, an MCN can offer many additional advantages, such as increased network throughput, scalability and coverage. However, providing ad hoc capability to MCNs is challenging as it may require proper wireless interfaces. In this article, the architecture of IEEE 802.16 network interface to provide ad hoc capability for MCNs is investigated, with its focus on the IEEE 802.16 mesh networking and scheduling. Several distributed routing algorithms based on network entry mechanism are studied and compared with a centralized routing algorithm. It is observed from the simulation results that 802.16 mesh networks have limitations on providing sufficient bandwidth for the traffic from the cellular base stations when a cellular network size is relatively large. © 2007 IEEE.

Secure routing and trust computation in multihop infrastructureless networks

Today's wireless networks rely mostly on infrastructural support for their operation. With the concept of ubiquitous computing growing more popular, research on infrastructureless networks have been rapidly growing. However, such types of networks face serious security challenges when deployed. This dissertation focuses on designing a secure routing solution and trust modeling for these infrastructureless networks. ^ The dissertation presents a trusted routing protocol that is capable of finding a secure end-to-end route in the presence of malicious nodes acting either independently or in collusion, The solution protects the network from active internal attacks, known to be the most severe types of attacks in an ad hoc application. Route discovery is based on trust levels of the nodes, which need to be dynamically computed to reflect the malicious behavior in the network. As such, we have developed a trust computational model in conjunction with the secure routing protocol that analyzes the different malicious behavior and quantifies them in the model itself. Our work is the first step towards protecting an ad hoc network from colluding internal attack. To demonstrate the feasibility of the approach, extensive simulation has been carried out to evaluate the protocol efficiency and scalability with both network size and mobility. ^ This research has laid the foundation for developing a variety of techniques that will permit people to justifiably trust the use of ad hoc networks to perform critical functions, as well as to process sensitive information without depending on any infrastructural support and hence will enhance the use of ad hoc applications in both military and civilian domains. ^

Next generation high density three-dimensional magnetic recording systems

This work is the first work using patterned soft underlayers in multilevel three-dimensional vertical magnetic data storage systems. The motivation stems from an exponentially growing information stockpile, and a corresponding need for more efficient storage devices with higher density. The world information stockpile currently exceeds 150EB (ExaByte=1x1018Bytes); most of which is in analog form. Among the storage technologies (semiconductor, optical and magnetic), magnetic hard disk drives are posed to occupy a big role in personal, network as well as corporate storage. However; this mode suffers from a limit known as the Superparamagnetic limit; which limits achievable areal density due to fundamental quantum mechanical stability requirements. There are many viable techniques considered to defer superparamagnetism into the 100's of Gbit/in2 such as: patterned media, Heat-Assisted Magnetic Recording (HAMR), Self Organized Magnetic Arrays (SOMA), antiferromagnetically coupled structures (AFC), and perpendicular magnetic recording. Nonetheless, these techniques utilize a single magnetic layer; and can thusly be viewed as two-dimensional in nature. In this work a novel three-dimensional vertical magnetic recording approach is proposed. This approach utilizes the entire thickness of a magnetic multilayer structure to store information; with potential areal density well into the Tbit/in2 regime. ^ There are several possible implementations for 3D magnetic recording; each presenting its own set of requirements, merits and challenges. The issues and considerations pertaining to the development of such systems will be examined, and analyzed using empirical and numerical analysis techniques. Two novel key approaches are proposed and developed: (1) Patterned soft underlayer (SUL) which allows for enhanced recording of thicker media, (2) A combinatorial approach for 3D media development that facilitates concurrent investigation of various film parameters on a predefined performance metric. A case study is presented using combinatorial overcoats of Tantalum and Zirconium Oxides for corrosion protection in magnetic media. ^ Feasibility of 3D recording is demonstrated, and an emphasis on 3D media development is emphasized as a key prerequisite. Patterned SUL shows significant enhancement over conventional "un-patterned" SUL, and shows that geometry can be used as a design tool to achieve favorable field distribution where magnetic storage and magnetic phenomena are involved. ^

Redes Sociais Pessoais e Mobilidade em Idosos

Objetivos: A investigação tem como objetivo geral analisar a associação entre a mobilidade nos idosos e as características estruturais, funcionais e relacionais-contextuais das suas redes sociais pessoais. Metodologia: No nosso estudo utilizámos o Instrumento de Análise da Rede Social Pessoal, IARSP, versão idosos (IARSP Idosos de Guadalupe & Vicente, 2012; Guadalupe, 2009), que permite caracterizar a rede social pessoal do individuo e uma questão do WHOQOL (OMS; Canavarro et al., 2006) para avaliar a perceção de mobilidade. Participantes: A amostra é constituída por 446 idosos com idades compreendidas entre os 65 anos e os 98 anos. Os participantes são na sua maioria do sexo feminino (63,9%; n = 285), casados (51,6%; n = 230) e com escolaridade (65,9%; n = 294). Resultados: Verifica-se que são os idosos do sexo feminino, os casados e com escolaridade, aqueles que apresentam uma média mais elevada de mobilidade percebida. Constata-se que existe uma maior proporção de idosos cuja mobilidade é “boa ou muito boa” (48,2%; n = 215) em comparação com os que têm uma mobilidade “nem boa nem má” (26,5%; n = 118) e com os que a mobilidade é “má ou muito má” (25,3%; n = 113). Quanto às características estruturais, os idosos que apresentam melhor mobilidade percebida têm uma média mais elevada na proporção das relações familiares nas redes (M = 77%), quanto às características funcionais, na companhia social (M = 2,37), apesar de não existirem diferenças significativas, e na reciprocidade de apoio (M = 3,53; p= 0,002), e consideram estar muito satisfeitos com a rede (M = 2,87, p= 0,059), quando tais características comparadas com as dos idosos com pior mobilidade. Verificam-se também diferenças entre as subamostras quer no apoio material e instrumental (M = 2,30; p = 0,013) e no apoio informativo (M = 2,44; p = 0,001), registando o grupo das pessoas com pior mobilidade as médias mais baixas. Quanto às características relacionais contextuais, na durabilidade das relações, os sujeitos com mobilidade “má ou muito má” apresentam uma média mais elevada (M = 42,41 anos; p = 0,025). Conclusão: Segundo a pior ou melhor mobilidade, é nas características funcionais que se assinalam as principais diferenças estatisticamente significativas, o que nos permitem afirmar uma associação entre mobilidade nos idosos e as relações interpessoais, pelo conteúdo das relações e pelo apoio que percecionam. Concluímos que os idosos que se consideram com melhor mobilidade apresentam, na generalidade, características de rede social mais positivas quando comparados com os que têm menor mobilidade percebida. /Objectives: The main goal of the research is to analyze the association between mobility in the elderly and the structural, functional and relational-contextual characteristics of their personal social networks. Methodology: In our study, we used the Social Personal Network Assessment Tool – IARSP , elderly version (IARSP-Idosos of Guadalupe Vicente, 2012; Guadalupe, 2009), enabling an individual's personal social network and a question of WHOQOL (WHO; Canavarro and such, 2006) to evaluate their perception of functionality of mobility. Participants: The study has 446 elderly participants aged between 65 years and 98 years. Participants are mostly female (63,9%; N = 285), married (51,6%; N = 230) and with education (65,9%; N = 294). Results: We found that older women, married and with education are those with a better mobility. It is noted that there is a greater proportion of elderly people whose mobility is "good or very good" (48.2%, n = 215) compared to those with a mobility "neither good nor bad" (26.5%, n = 118) and the mobility is "bad or very bad" (25.3%; n = 113). Regarding the structural characteristics, seniors who have better perceived mobility have a higher average in the proportion of family relationships in networks (M = 77%; p 0,331), and for the functional characteristics as social company (2, 37; p = 0,418), reciprocal support (3.53; p = 0.002), and satisfaction with their network (M = 2.87; p = 0.059) when these characteristics are compared with those of older people with poor mobility. Exist also statistically significant differences between subsamples either in the material and instrumental support (M = 2.30; p = 0.013) and informational support (M = 2.44; p = 0.001), recording the group of people with poorest mobility. For the relational and contextual characteristics, individuals with mobility "bad or very bad" have a higher mean durability of relationships (M = 42.41; p = 0.025). Conclusion: According to better or worse mobility, the functional characteristics indicates major differences between subsamples, that allow us to assert an association between mobility in the elderly and the content of interpersonal relationships, as well as the perception of support. We conclude that the elderly who consider themselves to have better mobility in general, have more positive social networking features when compared to those with lower perceived mobility.

Rede Social Pessoal, Qualidade de Vida e Depressão em Idosos

Em Portugal e no Mundo Ocidental a população está a envelhecer, colocando esta nova realidade enormes desafios à sociedade. A sua crescente relevância deve-se sobretudo às consideráveis repercussões a nível pessoal, familiar, sociopolítico e económico e que afetam pessoas de todas as idades e a sociedade como um todo, colocando desafios específicos relativamente às relações interpessoais, à qualidade de vida e à saúde mental na pessoa idosa. Deste modo, o presente trabalho tem como objetivo analisar a associação entre a qualidade de vida, a depressão e as características das redes sociais pessoais dos idosos. Participaram no estudo 317 indivíduos, sendo 202 do sexo feminino e 115 do sexo masculino, com idade igual ou superior a 65 anos, com uma média de 77 anos (DP=7,57). Na recolha de dados recorremos a três instrumentos: Geriatric Depression Scale (GDS Short Form 15), (Yesavage et al., 1983; Almeida & Almeida, 1999); Instrumento de Avaliação de Qualidade de Vida da OMS (WHOQOL), (OMS, 1998; Canavarro et al., 2006); Instrumento de Avaliação das Redes Sociais Pessoais (IARSP – Idosos), (Guadalupe, 2010; Guadalupe & Vicente, 2012). Dos resultados destacamos que as características funcionais da rede social pessoal se diferenciaram de forma estatisticamente significativa entre as subamostras de idosos segundo os níveis de qualidade de vida percebida. Saliente-se que, além da relação significativa entre a depressão e qualidade de vida, em que os idosos com um nível mais baixo de qualidade de vida percebida apresentam maiores níveis de depressão (p<0,001), as características funcionais das redes sociais apresentam uma associação clara com a qualidade de vida (p<0,005) e a maioria com a depressão (p<0,014), o que não acontece com as estruturais e com as relacionais-contextuais. Outros resultados indicam que indivíduos com diferentes níveis de qualidade de vida percebida possuem uma estrutura idêntica da rede social pessoal. Ao nível da análise da associação entre as variáveis funcionais da Rede Social Pessoal, Qualidade de Vida e Depressão, o modelo analítico transmite-nos indicadores de investigação e intervenção precisos, o que demonstra a necessidade da continuidade e aprofundamento do presente estudo num âmbito amostral mais alargado e heterogéneo. / In Portugal and in the eastern world, the aging of population creates huge challenges to societies. It's growing relevance is owed to considerable repercussions on the personal, familiar, socio-politic and economic level that affect people of all ages and society as a whole, creating specific challenges regarding interpersonal relationships, quality of life and mental health of the elderly. The current work has the objective of analyzing the association between quality of life, depression and the characteristics of personal social networks of the elderly. 317 individuals have participated in this study, 202 female and 115 male, with age equal or above 65 years old, with an average of 77 years old (DP=7,57). We used three assessment instruments to collect data: Geriatric Depression Scale (GDS Short Form 15), (Yesavage et al., 1983; Almeida & Almeida, 1999); WHO’s Quality of Life Evaluation instrument (WHOQOL) (WHO, 1998; Canavarro et al., 2006); Personal Social Network Analysis Tool (IARSP-Elderly),(Guadalupe, 2010; Guadalupe & Vicente, 2012). The results show that the functional personal network characteristics are significantly different according to their level of quality of life. It should also be noted that not only there is a significant association between depression and quality of life, in which elderly people with a lower quality of life level show higher levels of depression (p<0,001), there is also a clear association between the functional social network characteristics and quality of life (p<0,005), and the majority with depression (p<0,014), which doesn’t happen with structural and relational-contextual social network characteristics. Other results indicate that different levels of quality of life acquire an identical social network structure. On the matter of association between the functional variables of social networks, quality of fife and depression, the analytic model shows precise indicators of research and intervention, which instills us a need to continue and enlarge this study with an wider and more heterogeneous sample.

Satisfação com a Vida e Redes Sociais Pessoais de Idosos

Objetivos: A investigação tem como objetivo geral analisar a associação entre a satisfação com a vida nos idosos e as características estruturais, funcionais e relacionais-contextuais das suas redes sociais pessoais. Metodologia: A recolha dos dados foi feita através de um questionário sociodemográfico, da Satisfaction With Life Scale – SWLS (Diener, 1985) que permite avaliar o grau de satisfação com a vida e também do Instrumento de Avaliação da Rede Social Pessoal – IARSP – Idosos (Guadalupe, 2009; Guadalupe & Vicente, 2012) que possibilita a análise das características das redes sociais pessoais dos idosos. Participantes: A amostra é constituída por 416 idosos com idades compreendidas entre os 65 anos e os 98 anos (M = 76,15; DP = 7,584). Os participantes são de ambos os sexos, mas na sua maioria do sexo feminino (63,7%; n = 265). A maioria dos sujeitos da amostra é casada (51,2%; n = 213) e tem escolaridade (64,2%; n = 267). Resultados: Verifica-se que são as mulheres idosas, os casados e com escolaridade que percebem uma maior satisfação com a vida. Constata-se que existe uma maior proporção de idosos satisfeitos com a vida (53,8%; n = 83) em comparação com os medianamente satisfeitos (26,2%; n = 109) e com os insatisfeitos (20%; n = 83). Os idosos que apresentam uma maior satisfação percebida têm uma média mais elevada na proporção das relações familiares nas redes (M = 80,67), no apoio emocional, material e instrumental, informativo, companhia social, e no acesso a novos vínculos, e consideram estar muito satisfeitos tanto com a rede (M = 2,92) como com o apoio que esta disponibiliza (M = 2,77). Conclusão: Verificaram-se associações estatisticamente significativas nas características estruturais da rede, no entanto são as características funcionais que atestam os principais resultados que nos permitem afirmar uma associação entre satisfação com a vida nos idosos e as relações interpessoais, pelo conteúdo das relações e pelo apoio que percecionam. Concluímos que os idosos que se consideram satisfeitos com a vida apresentavam, na generalidade, características de rede social mais positivas quando comparados com os que percebiam menor satisfação com a vida. / Objectives: The research has as main objective to analyze the association between life satisfaction in the elderly and the structural, functional and relational-contextual characteristics of their personal social networks. Methodology: The data collection was done through a sociodemographic questionnaire, the Satisfaction With Life Scale – SWLS (Diener, 1985) that evaluates the degree of satisfaction with life and also the Personal Social Network Analysis Tool – IARSP – Elderly (Guadalupe, 2009; Guadalupe & Vicente, 2012) for the analysis of personal social networks’ characteristics. Participants: The sample consisted of 416 elderly aged between 65 and 98 years (M = 76,15; SD = 7,584). Participants are both genders, but mostly female (63,7%; n =265). Most of the participants are married (51,2%; n = 213) and have education (64,2%; n = 267). Results: It is found that are the older women, married and with education that perceive a greater satisfaction with life. There is a greater proportion of elderly satisfied with the lives (53,8%; n = 83) compared to the moderately satisfied (26,2%; n = 109) and the unsatisfied (20%; n = 83). Seniors who have a higher satisfaction have a higher average in the proportion of family relationships in their networks (M = 80,67), emotional support, material and instrumental, informational, social companionship, and access to new bonds, and consider to be very satisfied with their social network (M = 2,92) and with the social support that it provides (M = 2,77). Conclusion: There were statistically significant associations in the structural characteristics of the network, however are the functional characteristics that allow us to state an association between life satisfaction in the elderly through interpersonal relationships, the content of relations and the support they perceive. We conclude that elderly people who consider themselves satisfied with life showed, in general, have more positive characteristics of social personal network when compared to those who perceive less satisfaction with life.

The interplay between social motivation, social experience, and developmental neural specialization for social perception

From birth, infants preferentially attend to human motion, which allows them to learn to interpret other peoples’ facial expressions and mental states. Evidence from adults shows that selectivity of the amygdala and the posterior superior temporal sulcus (pSTS) to biological motion correlates with social network size. Social motivation—one’s desire to orient to the social world, to seek and find reward in social interaction, and to maintain social relationships—may also contribute to neural specialization for biological motion and to social network characteristics. The current study aimed to determine whether neural selectivity for biological motion relates to social network characteristics, and to gain preliminary evidence as to whether social motivation plays a role in this relation. Findings suggest that neural selectivity for biological motion in the pSTS is positively related to social network size in middle childhood and that this relation is moderated by social motivation.

Las posibilidades de internet en la reconfiguración de la red social primaria del adulto mayor, fracturada por efecto de la migración* El caso de los adultos mayores con parientes migrantes en 6 municipios del departamento del Quindío

El presente artículo muestra cómo Internet se convierte en una herramienta de comunicación importante para reconfigurar la red social primaria del adulto mayor, fracturada por efecto de la migración. En la investigación que le da origien, se pudo constatar que hoy esta red se encuentra dividida en red primaria natural, conformada por los parientes y amigos con los que comparte el día a día, y red primaria virtual, integrada por los parientes migrantes. El escrito centra su interés en presentar las características de la red primaria virtual en la que el adulto mayor se vio impelido a participar para satisfacer sus necesidades comunicacionales. Esta red cumple la función de mantener, pero no de extender, su red social primaria. Los resultados dan cuenta de 4 aspectos: las competencias digitales desarrolladas por el adulto mayor, la estructura, las funciones y los atributos de vínculo de la red primaria virtual. Para ello se acudió a autores como Cabrera, Castell; Madarriaga, Abello & Sierra; Narváez A.; Soto, Navarro & Sánchez; Tovar & Villarraga. La investigación fue de tipo etnográfico, con enfoque cualitativo. Se aplicaron entrevistas semi-estructuradas. Para el tratamiento de la información se utilizó la teoría Fundamentad, de Strauss & Corbin (2002).

Transient scaling and resurgence of chimera states in networks of Boolean phase oscillators.

We study networks of nonlocally coupled electronic oscillators that can be described approximately by a Kuramoto-like model. The experimental networks show long complex transients from random initial conditions on the route to network synchronization. The transients display complex behaviors, including resurgence of chimera states, which are network dynamics where order and disorder coexists. The spatial domain of the chimera state moves around the network and alternates with desynchronized dynamics. The fast time scale of our oscillators (on the order of 100ns) allows us to study the scaling of the transient time of large networks of more than a hundred nodes, which has not yet been confirmed previously in an experiment and could potentially be important in many natural networks. We find that the average transient time increases exponentially with the network size and can be modeled as a Poisson process in experiment and simulation. This exponential scaling is a result of a synchronization rate that follows a power law of the phase-space volume.

The sample complexity of pattern classification with neural networks: the size of the weights is more important than the size of the network

Sample complexity results from computational learning theory, when applied to neural network learning for pattern classification problems, suggest that for good generalization performance the number of training examples should grow at least linearly with the number of adjustable parameters in the network. Results in this paper show that if a large neural network is used for a pattern classification problem and the learning algorithm finds a network with small weights that has small squared error on the training patterns, then the generalization performance depends on the size of the weights rather than the number of weights. For example, consider a two-layer feedforward network of sigmoid units, in which the sum of the magnitudes of the weights associated with each unit is bounded by A and the input dimension is n. We show that the misclassification probability is no more than a certain error estimate (that is related to squared error on the training set) plus A3 √((log n)/m) (ignoring log A and log m factors), where m is the number of training patterns. This may explain the generalization performance of neural networks, particularly when the number of training examples is considerably smaller than the number of weights. It also supports heuristics (such as weight decay and early stopping) that attempt to keep the weights small during training. The proof techniques appear to be useful for the analysis of other pattern classifiers: when the input domain is a totally bounded metric space, we use the same approach to give upper bounds on misclassification probability for classifiers with decision boundaries that are far from the training examples.

On the choice of posittioning and cluster size for fixed relay stations in a LTE network

The long term evolution (LTE) is one of the latest standards in the mobile communications market. To achieve its performance, LTE networks use several techniques, such as multi-carrier technique, multiple-input-multiple-output and cooperative communications. Inside cooperative communications, this paper focuses on the fixed relaying technique, presenting a way for determining the best position to deploy the relay station (RS), from a set of empirical good solutions, and also to quantify the associated performance gain using different cluster size configurations. The best RS position was obtained through realistic simulations, which set it as the middle of the cell's circumference arc. Additionally, it also confirmed that network's performance is improved when the number of RSs is increased. It was possible to conclude that, for each deployed RS, the percentage of area served by an RS increases about 10 %. Furthermore, the mean data rate in the cell has been increased by approximately 60 % through the use of RSs. Finally, a given scenario with a larger number of RSs, can experience the same performance as an equivalent scenario without RSs, but with higher reuse distance. This conduces to a compromise solution between RS installation and cluster size, in order to maximize capacity, as well as performance.

Mapping personal trip OD from probe data

The paper analyses the expected value of OD volumes from probe with fixed error, error that is proportional to zone size and inversely proportional to zone size. To add realism to the analysis, real trip ODs in the Tokyo Metropolitan Region are synthesised. The results show that for small zone coding with average radius of 1.1km, and fixed measurement error of 100m, an accuracy of 70% can be expected. The equivalent accuracy for medium zone coding with average radius of 5km would translate into a fixed error of approximately 300m. As expected small zone coding is more sensitive than medium zone coding as the chances of the probe error envelope falling into adjacent zones are higher. For the same error radii, error proportional to zone size would deliver higher level of accuracy. As over half (54.8%) of the trip ends start or end at zone with equivalent radius of ≤ 1.2 km and only 13% of trips ends occurred at zones with equivalent radius ≥2.5km, measurement error that is proportional to zone size such as mobile phone would deliver higher level of accuracy. The synthesis of real OD with different probe error characteristics have shown that expected value of >85% is difficult to achieve for small zone coding with average radius of 1.1km. For most transport applications, OD matrix at medium zone coding is sufficient for transport management. From this study it can be drawn that GPS with error range between 2 and 5m, and at medium zone coding (average radius of 5km) would provide OD estimates greater than 90% of the expected value. However, for a typical mobile phone operating error range at medium zone coding the expected value would be lower than 85%. This paper assumes transmission of one origin and one destination positions from the probe. However, if multiple positions within the origin and destination zones are transmitted, map matching to transport network could be performed and it would greatly improve the accuracy of the probe data.

From homepages to network profiles : balancing personal and social identity

The World Wide Web constitutes one of the most important inventions of the late 20th century: it has changed culture, society, business, communication, politics, and many other fields of human endeavour, not least also by providing a more user-friendly pathway of access to its major underlying technology, the Internet itself. Key phases in its development can be charted, especially by how it has been used to present and share information – and here, the personal or professional, private or official homepage stands in as a useful representation of wider Web trends overall. From hand-coded beginnings through several successive stages of experimentation and standardisation, to the shifting balance between personal sites and social networks, the homepage demonstrates how the Web itself, and its place in our lives, have changed.