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Particular Task (particular + task)

Distribution by Scientific Domains

Medical Sciences	40%

Selected Abstracts

Developing and validating a tool to measure parenting self-efficacy

JOURNAL OF ADVANCED NURSING, Issue 2 2005
Sally Kendall BSc PHD RGN RHV
Aims., This paper reports the development of a tool to measure parenting self-efficacy as an aid to evaluating parenting programmes. Background., Whilst there has been increasing interest in parenting programmes from parents, government and professionals, there is a lack of rigorous evaluation studies of their effectiveness, particularly their longer-term outcomes. Equally, there is little research evidence of the views and experiences of parents themselves. It is important to develop robust outcome measures which draw on well-developed theoretical constructs to measure parents' perceived abilities to manage their children based on their own views and experiences. Self-efficacy, a self-perception of one's ability to perform competently and effectively in a particular task or setting, may provide such a framework. Methods., Data from 12 focus groups conducted with parents and parenting programme facilitators informed the development of the tool. A thematic analysis of the focus group transcripts identified key items to be included in the self-efficacy instrument, and these were developed into 82 Likert-format statements. A multi-method approach was used to test the instrument for validity and reliability. Findings., Nine domain specific sub-scales of parenting were identified from the analysis of the focus group data. Internal reliability coefficients for the subscales ranged from 0·80 to 0·89, and the overall scale reliability was 0·94. External reliability coefficients ranged from rs = 0·58 (n = 19, P < 0·01) to rs = 0·88 (n = 19, P < 0·01). Conclusion., A valid and reliable tool to measure parenting self-efficacy has been developed, which will aid evaluation of parenting programmes. [source]

Analysis of algorithms for two-stage flowshops with multi-processor task flexibility

NAVAL RESEARCH LOGISTICS: AN INTERNATIONAL JOURNAL, Issue 1 2004
George L. Vairaktarakis
Abstract In this article we introduce a 2-machine flowshop with processing flexibility. Two processing modes are available for each task: namely, processing by the designated processor, and processing simultaneously by both processors. The objective studied is makespan minimization. This production environment is encountered in repetitive manufacturing shops equipped with processors that have the flexibility to execute orders either individually or in coordination. In the latter case, the product designer exploits processing synergies between two processors so as to execute a particular task much faster than a dedicated processor. This type of flowshop environment is also encountered in labor-intensive assembly lines where products moving downstream can be processed either in the designated assembly stations or by pulling together the work teams of adjacent stations. This scheduling problem requires determining the mode of operation of each task, and the subsequent scheduling that preserves the flowshop constraints. We show that the problem is ordinary NP-complete and obtain an optimal solution using a dynamic programming algorithm with considerable computational requirements for medium and large problems. Then, we present a number of dynamic programming relaxations and analyze their worst-case error performance. Finally, we present a polynomial time heuristic with worst-case error performance comparable to that of the dynamic programming relaxations. © 2003 Wiley Periodicals, Inc. Naval Research Logistics, 2004. [source]

The origami of thioredoxin-like folds

PROTEIN SCIENCE, Issue 10 2006
Jonathan L. Pan
Abstract Origami is the Japanese art of folding a piece of paper into complex shapes and forms. Much like origami of paper, Nature has used conserved protein folds to engineer proteins for a particular task. An example of a protein family, which has been used by Nature numerous times, is the thioredoxin superfamily. Proteins in the thioredoxin superfamily are all structured with a ,-sheet core surrounded with ,-helices, and most contain a canonical CXXC motif. The remarkable feature of these proteins is that the link between them is the fold; however, their reactivity is different for each member due to small variations in this general fold as well as their active site. This review attempts to unravel the minute differences within this protein family, and it also demonstrates the ingenuity of Nature to use a conserved fold to generate a diverse collection of proteins to perform a number of different biochemical tasks. [source]

Biodemographic analysis of male honey bee mortality

AGING CELL, Issue 1 2005
Olav Rueppell
Summary Biodemographic studies of insects have significantly enhanced our understanding of the biology of aging. Eusocial insects have evolved to form different groups of colony members that are specialized for particular tasks and highly dependent on each other. These different groups (castes and sexes) also differ strongly in their life expectancy but relatively little is known about their mortality dynamics. In this study we present data on the age-specific flight activity and mortality of male honey bees from two different genetic lines that are exclusively dedicated to reproduction. We show that males initiating flight at a young age experience more flight events during their lifetime. No (negative) relation between the age at flight initiation and lifespan exists, as might be predicted on the basis of the antagonistic pleiotropy theory of aging. Furthermore, we fit our data to different aging models and conclude that overall a slight deceleration of the age-dependent mortality increase at advanced ages occurs. However, mortality risk increases according to the Gompertz,Makeham model when only days with flight activity (active days) are taken into account. Our interpretation of the latter is that two mortality components act on honey bee males during flight: increasing, age-dependent deaths (possibly from wear-and-tear), and age-independent deaths (possibly due to predation). The overall mortality curve is caused by the interaction of the distribution of age at foraging initiation and the mortality function during the active (flight) lifespan. [source]

Deliberate Practice and Acquisition of Expert Performance: A General Overview

ACADEMIC EMERGENCY MEDICINE, Issue 11 2008
K. Anders Ericsson PhD
Traditionally, professional expertise has been judged by length of experience, reputation, and perceived mastery of knowledge and skill. Unfortunately, recent research demonstrates only a weak relationship between these indicators of expertise and actual, observed performance. In fact, observed performance does not necessarily correlate with greater professional experience. Expert performance can, however, be traced to active engagement in deliberate practice (DP), where training (often designed and arranged by their teachers and coaches) is focused on improving particular tasks. DP also involves the provision of immediate feedback, time for problem-solving and evaluation, and opportunities for repeated performance to refine behavior. In this article, we draw upon the principles of DP established in other domains, such as chess, music, typing, and sports to provide insight into developing expert performance in medicine. [source]