Home About us Contact
|
Home About us Contact | ||
|
|
||
Moving Target (moving + target)
Selected AbstractsEMERGENCY CORONARY ARTERY BYPASS GRAFTING: A MOVING TARGETANZ JOURNAL OF SURGERY, Issue 9 2006Brian F. Buxton No abstract is available for this article. [source] The IASB Agenda , A Moving TargetAUSTRALIAN ACCOUNTING REVIEW, Issue 42 2007WOLFGANG DICK This paper reviews the agenda of the International Accounting Standards Board (IASB) and the opportunities for research that it provides. The paper analyses the progress of topics on the 2001 agenda and concludes that evolution is variable, partly due to the appearance of later priorities. It goes on to discuss how research may inform standard-setting and analyses how major projects currently on the agenda lend themselves to academic research. [source] Moving targets: The dynamics of goal setting and performanceJOURNAL OF CORPORATE ACCOUNTING & FINANCE, Issue 3 2009C. J. McNair-Connolly As organizations seek ways to improve performance, reduce costs, and maximize the value created for customers and other stakeholders, they need to make sure that the dynamics embedded in their management control system,the linkages between goal setting and performance,create a natural platform for internalization of the organization's goals by the workforce. © 2009 Wiley Periodicals, Inc. [source] Cut-off scores in MMSE: a moving target?EUROPEAN JOURNAL OF NEUROLOGY, Issue 5 2010J. Morgado Background:, Cognitive tests are known to be influenced by language, culture and education. In addition, there may be an impact of ,epoch' in cognition, because there is secular increase in scores of IQ tests in children. If we assume this is a long lasting process, then it should persist later in life. Methods:, To test this hypothesis, we compared the performance of two cohorts of individuals (,50 years of age), evaluated 20 years apart using the Mini-Mental State Examination (MMSE). Results:, Study population included 135 participants in 1988 and 411 in 2008. MMSE scores were higher in 2008 than in 1988 for literacy x age-matched subgroups, the difference being significant for participants with lower literacy. Score variance was explained by literacy (, = 0.479, t = 14.598, P = 0.00), epoch (, = 0.34, t = 10.33, P = 0.00) and age (, = ,0.142, t = ,4.184, P = 0.00). Conclusion:, The present results are in accordance with a lifelong secular improvement in cognitive performance. The operational cut-off values may change with time, which may have clinical impact in the diagnosis of disorders like mild cognitive impairment or dementia. [source] The role of V5 (hMT+) in visually guided hand movements: an fMRI studyEUROPEAN JOURNAL OF NEUROSCIENCE, Issue 11 2004C. Oreja-Guevara Abstract Electrophysiological studies in animals suggest that visuomotor control of forelimb and eye movements involves reciprocal connections between several areas (striate, extrastriate, parietal, motor and premotor) related to movement performance and visuospatial coding of movement direction. The extrastriate area MT [V5 (hMT+) in humans] located in the ,dorsal pathway' of the primate brain is specialized in the processing of visual motion information. The aim of our study was to investigate the functional role of V5 (hMT+) in the control of visually guided hand movements and to identify the corresponding cortex activation implicated in the visuomotor tasks using functional magnetic resonance imaging. Eight human subjects performed visually guided hand movements, either continuously tracking a horizontally moving target or performing ballistic tracking movements of a cursor to an eccentric stationary target while fixating a central fixation cross. The tracking movements were back-projected onto the screen using a cursor which was moved by an MRI-compatible joystick. Both conditions activated area V5 (hMT+), right more than left, particularly during continuous tracking. In addition, a large-scale sensorimotor circuit which included sensorimotor cortex, premotor cortex, striatum, thalamus and cerebellum as well as a number of cortical areas along the intraparietal sulcus in both hemispheres were activated. Because activity was increased in V5 (hMT+) during continuous tracking but not during ballistic tracking as compared to motion perception, it has a pivotal role during the visual control of forelimb movements as well. [source] Mechanisms of regulatory T-cell suppression , a diverse arsenal for a moving targetIMMUNOLOGY, Issue 1 2008Dorothy K. Sojka Summary Naturally-occurring regulatory T cells (Tregs) are emerging as key regulators of immune responses to self-tissues and infectious agents. Insight has been gained into the cell types and the cellular events that are regulated by Tregs. Indeed, Tregs have been implicated in the control of initial activation events, proliferation, differentiation and effector function. However, the mechanisms by which Tregs disable their cellular targets are not well understood. Here we review recent advances in the identification of distinct mechanisms of Treg action and of signals that enable cellular targets to escape regulation. Roles for inhibitory cytokines, cytotoxic molecules, modulators of cAMP and cytokine competition have all been demonstrated. The growing number of inhibitory mechanisms ascribed to Tregs suggests that Tregs take a multi-pronged approach to immune regulation. It is likely that the relative importance of each inhibitory mechanism is context dependent and modulated by the inflammatory milieu and the magnitude of the immune response. In addition, the target cell may be differentially susceptible or resistant to distinct Treg mechanisms depending on their activation or functional status at the time of the Treg encounter. Understanding when and where each suppressive tool is most effective will help to fine tune therapeutic strategies to promote or constrain specific arms of Treg suppression. [source] Liver allocation for HCC: A moving targetLIVER TRANSPLANTATION, Issue 1 2004Richard B. Freeman [source] Path optimization for the resource-constrained searcher,NAVAL RESEARCH LOGISTICS: AN INTERNATIONAL JOURNAL, Issue 5 2010Hiroyuki Sato Abstract We formulate and solve a discrete-time path-optimization problem where a single searcher, operating in a discretized three-dimensional airspace, looks for a moving target in a finite set of cells. The searcher is constrained by maximum limits on the consumption of one or more resources such as time, fuel, and risk along any path. We develop a specialized branch-and-bound algorithm for this problem that uses several network reduction procedures as well as a new bounding technique based on Lagrangian relaxation and network expansion. The resulting algorithm outperforms a state-of-the-art algorithm for solving time-constrained problems and also is the first algorithm to solve multi-constrained problems. © 2010 Wiley Periodicals, Inc. Naval Research Logistics, 2010 [source] Optimal search for a moving target with the option to waitNAVAL RESEARCH LOGISTICS: AN INTERNATIONAL JOURNAL, Issue 6 2009János Flesch Abstract We investigate the problem in which an agent has to find an object that moves between two locations according to a discrete Markov process (Pollock, Operat Res 18 (1970) 883,903). At every period, the agent has three options: searching left, searching right, and waiting. We assume that waiting is costless whereas searching is costly. Moreover, when the agent searches the location that contains the object, he finds it with probability 1 (i.e. there is no overlooking). Waiting can be useful because it could induce a more favorable probability distribution over the two locations next period. We find an essentially unique (nearly) optimal strategy, and prove that it is characterized by two thresholds (as conjectured by Weber, J Appl Probab 23 (1986) 708,717). We show, moreover, that it can never be optimal to search the location with the lower probability of containing the object. The latter result is far from obvious and is in clear contrast with the example in Ross (1983) for the model without waiting. © 2009 Wiley Periodicals, Inc. Naval Research Logistics 2009 [source] Clinical investigation in ACS and PCI: Shooting in the dark at a moving target,CATHETERIZATION AND CARDIOVASCULAR INTERVENTIONS, Issue 2 2009FSCAI, George Dangas MD No abstract is available for this article. [source] WHOMoVeS: An optimized broadband sensor network for military vehicle trackingINTERNATIONAL JOURNAL OF COMMUNICATION SYSTEMS, Issue 3 2008Mohamed Hamdi Abstract With the advance of sensing technologies and their applications, advanced sensor networks are gaining increasing interest. For certain sensitive applications, heterogeneous sensors can be deployed in the monitored space to ensure scalability, high-speed communication, and long network lifetime. Hybrid sensor networks have capabilities to combine the use of both resource-rich and resource-impoverished sensor nodes. This paper proposes a heterogeneous broadband sensor network architecture for military vehicle tracking. Powerful sensor devices with good bandwidth and energy capabilities are used as a communication backbone while energy sensors are used to track moving targets. Copyright © 2007 John Wiley & Sons, Ltd. [source] Effect of lateral target motion on image registration accuracy in CT-guided helical tomotherapy: A phantom studyJOURNAL OF MEDICAL IMAGING AND RADIATION ONCOLOGY, Issue 3 2010J Medwig Summary Optimisation of imaging modes for kilovoltage CT (kVCT) used for treatment planning and megavoltage CT (MVCT) image guidance used in ungated helical tomotherapy was investigated for laterally moving targets. Computed tomography images of the QUASARÔ Respiratory Motion Phantom were acquired without target motion and for lateral motion of the target, with 2-cm peak-to-peak amplitude and a period of 4 s. Reference kVCT images were obtained using a 16-slice CT scanner in standard fast helical CT mode, untagged average CT mode and various post-processed 4D-CT modes (0% phase, average and maximum intensity projection). Three sets of MVCT images with different inter-slice spacings of were obtained on a Hi-Art tomotherapy system with the phantom displaced by a known offset position. Eight radiation therapists performed co-registration of MVCT obtained with 2-, 4- and 6-mm slice spacing and kVCT studies independently for all 15 CT imaging combinations. In the investigated case, the untagged average kVCT and 4-mm slice spacing for the MVCT yielded more accurate registration in the transverse plane. The average residual uncertainty of this combination of imaging procedures was 0.61 ± 0.16 mm in the longitudinal direction, 0.45 ± 0.14 mm in the anterior,posterior direction and insignificant in the lateral direction. Manual registration of MVCT,kVCT study pairs is necessary to account for a target in significant lateral motion with respect to bony structures. [source] | |||||||||||||