Data relaying with constraints in hierarchical sensor networks

In this paper we present and discuss several optimisation problems that arise in the management of data flow in wireless sensor networks (WSNets). We consider a hierarchical architecture for WSNets composed of sensors, relays, and relay gateways. Sensors send data they generate at a known average bit rate to relays in one hop. The relay nodes use a multi-hop mechanism to reach a set of assigned gateways which then forward the data directly to the base station. We are concerned with finding an assignment of relay gateways to relays so that certain constraints are satisfied. We define a unified model in which constraints such as lifetime, data delay, and data flow splitting are formulated in terms of four optimisation problem in graphs.     

国际援助：闪耀人性之光(英文)

地震给四川人民的生活带来了巨大的损失。来自五湖四海的志愿者和捐助者们奔赴灾区。帮助当地人民重建家园。     

The Next Generation of Diversity and Intergroup Relations Research

Recent court decisions and cultural shifts have led to a new focus for work on equity and equality of outcomes in educational settings. This article reviews the contributions of recent diversity studies and then focuses on a longitudinal study of 4,403 college students attending nine public universities. Results show that student interaction with diverse peers during college results in changes in student cognitive, social, and democratic outcomes by the second year of college. Campus efforts to provide opportunities for students to learn about diverse groups inside and outside the classroom have an appreciable impact on students.     

A developmental approach to resistance

Diagnosis, treatment and technical interventions are dependent on a theoretical interpretation of the behavior of a patient. The clinical material presented addresses an initial alternative assessment of resistances, not from a classical theoretical position of opposition to the analytic procedure, the defense of the neurosis and a safeguard against pain and danger, but behavior that expresses a developmental need and deficit in the patient that is expressed in the treatment and relationship to the therapist.     

Applied state space modelling of non-Gaussian time series using integration-based Kalman filtering

The main topic of the paper is on-line filtering for non-Gaussian dynamic (state space) models by approximate computation of the first two posterior moments using efficient numerical integration. Based on approximating the prior of the state vector by a normal density, we prove that the posterior moments of the state vector are related to the posterior moments of the linear predictor in a simple way. For the linear predictor Gauss-Hermite integration is carried out with automatic reparametrization based on an approximate posterior mode filter. We illustrate how further topics in applied state space modelling, such as estimating hyperparameters, computing model likelihoods and predictive residuals, are managed by integration-based Kalman-filtering. The methodology derived in the paper is applied to on-line monitoring of ecological time series and filtering for small count data.     

A Preliminary Investigation of Factors Associated With Job Loss Grief

This study investigated relationships among factors hypothesized as related to job loss grief. A summary grief score correlated positively with time since job loss and number of dependents, and negatively with length of notice. Perceived reemployment prospects and income loss related positively to some grief index subscales, as did the condition of living on one's own. Job duration correlated negatively with some grief responses. Implications for counseling and avenues for future research are discussed.     

The family system,temporary or permanent auxiliary ego: The differential fate of self-objects

This paper addresses the integration of developmental theory and family system theory. It is based on the assumption that the combination and integration of these two sets of theory gives the social work clinician the richest possible base for diagnostic assessment and intervention. Two points of intersection of these theories, birth and mate selection, are utilized to highlight the natural linkages between the theories and to demonstrate the combined power to more fully inform clinical practice.The human being like any other organism can be understood only in relation to its ecological niche, to which it is fitted by evolution and with which it is in balance or is striving for balance at every point of its life.     

The use and non‐use of assistive technologies from the world of information and communication technology by visually impaired young people: a walk on the tightrope of peer inclusion

In affluent societies how people use technology is symbolic of various values and identities. This article investigates the symbolic values and use of assistive technologies from the world of information and communication technology (ICT) in the daily lives of 11 visually impaired young Norwegians. The article draws on a qualitative interview study and employs an interactionist approach. While the use of ICT is found to symbolise competence, belonging and independence, the use of ICT assistive technologies is found to symbolise restriction, difference and dependency. Thus, ICT and ICT assistive technologies have inherently contradictory sets of associations. To fit in as ordinary young people the visually impaired participants reject ICT assistive technologies whenever possible. The partially sighted participants who are somehow capable of participating in online interactions with their peers without ICT assistive technologies reject them. The blind participants, however, do not have the option of participating online without ICT assistive technologies and, consequently, they accept ICT assistive technologies.