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Buckman, Noam (Noam M. ). "Decentralized task allocation for dynamic, time-sensitive tasks." Thesis, Massachusetts Institute of Technology, 2018. http://hdl.handle.net/1721.1/120195.
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Thesis: S.M., Massachusetts Institute of Technology, Department of Mechanical Engineering, 2018.<br>This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.<br>Cataloged from student-submitted PDF version of thesis.<br>Includes bibliographical references (pages 103-110).<br>In time-sensitive and dynamic missions, autonomous vehicles must respond quickly to new information and objectives. In the case of dynamic task allocation, a team of agents are presented with a new, unknown task that must be allocated with their original allocations. This is exacerbated further in decentralized settings where agents are limited to utilizing local information during the allocation process. This thesis presents a fully decentralized, dynamic task allocation algorithm that extends the Consensus-Based Bundle Algorithm (CBBA) to allow for allocating new tasks. Whereas static CBBA requires a full resetting of previous allocations, CBBA with Partial Replanning (CBBA-PR) enables the agents to only partially reset their allocations to efficiently and quickly allocate a new task. By varying the number of existing tasks that are reset during replan, the team can trade-off convergence speed with amount of coordination. By specifically choosing the lowest bid tasks for resetting, CBBA-PR is shown to converge linearly with the number of tasks reset and the network diameter of the team. In addition, limited replanning methods are presented for scenarios without sufficient replanning time. These include a single reset bidding procedure for agents at capacity, a no-replanning heuristic that can identify scenarios that does not require replanning, and a subteam formation algorithm for reducing the network diameter. Finally, this thesis describes hardware and simulation experiments used to explore the effects of ad-hoc, decentralized communication on consensus algorithms and to validate the performance of CBBA-PR.<br>by Noam Buckman.<br>S.M.
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Khaluf, Yara [Verfasser]. "Task allocation in robot swarms for time-constrained tasks / Yara Khaluf." Paderborn : Universitätsbibliothek, 2014. http://d-nb.info/1050192877/34.
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Fergusson, Janel. "Time judgments in dual-task conditions." Thesis, University of British Columbia, 2010. http://hdl.handle.net/2429/27745.
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Every day we complete a number of tasks which require us to accurately time events, from estimating how long it will take us to drive to work in the morning to steeping our afternoon tea for the correct duration. Although timing is very important in our everyday lives, we know relatively little about how we process time information.
Many models have been proposed to account for human timing, with the most prominent are the attentional gate model (AGM) and the multiple resources model. The AGM and the multiple resources model make many similar predictions about human timing, and it is often difficult to discriminate between the two. Toward this goal, the present research focused on a situation in which the two models make opposing predictions, that is, conditions which require participants two carry out two tasks concurrently with both of them requiring time-related processing..
Three experiments are reported, in which subjects were asked to estimate various shorter or longer intervals while concurrently carrying out a task that either required processing of time-related information or non-time based information. Results of all three studies seem more supportive of the multiple resources model of timing, rather than the AGM.
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Manolache, Sorin. "Schedulability analysis of real-time systems with stochastic task execution times." Licentiate thesis, Linköping University, Linköping University, ESLAB - Embedded Systems Laboratory, 2002. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-5730.
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<p>Systems controlled by embedded computers become indispensable in our lives and can be found in avionics, automotive industry, home appliances, medicine, telecommunication industry, mecatronics, space industry, etc. Fast, accurate and flexible performance estimation tools giving feedback to the designer in every design phase are a vital part of a design process capable to produce high quality designs of such embedded systems.</p><p>In the past decade, the limitations of models considering fixed task execution times have been acknowledged for large application classes within soft real-time systems. A more realistic model considers the tasks having varying execution times with given probability distributions. No restriction has been imposed in this thesis on the particular type of these functions. Considering such a model, with specified task execution time probability distribution functions, an important performance indicator of the system is the expected deadline miss ratio of tasks or task graphs.</p><p>This thesis proposes two approaches for obtaining this indicator in an analytic way. The first is an exact one while the second approach provides an approximate solution trading accuracy for analysis speed. While the first approach can efficiently be applied to monoprocessor systems, it can handle only very small multi-processor applications because of complexity reasons. The second approach, however, can successfully handle realistic multiprocessor applications. Experiments show the efficiency of the proposed techniques.</p><br>Report code: LiU-Tek-Lic-2002:58.
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Marion, Curtis George. "The task-resource allocation model : a perspective on task attributes, motivation and the dedication of time and effort to tasks /." The Ohio State University, 1992. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487779120906091.
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Krauth, Elfriede Irene. "Real-time planning support : a task-technology fit perspective = Real-time planningsondersteuning : de afstemming tussen taak en technologie /." Rotterdam : Erasmus Universiteit, 2008. http://opac.nebis.ch/cgi-bin/showAbstract.pl?u20=97890589221932.
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Mudrova, Lenka. "Task scheduling and merging in space and time." Thesis, University of Birmingham, 2017. http://etheses.bham.ac.uk//id/eprint/7872/.
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Every day, robots are being deployed in more challenging environments, where they are required to perform complex tasks. In order to achieve these tasks, robots rely on intelligent deliberation algorithms. In this thesis, we study two deliberation approaches – task scheduling and task planning. We extend these approaches in order to not only deal with temporal and spatial constraints imposed by the environment, but also exploit them to be more efficient than the state-of-the-art approaches. Our first main contribution is a scheduler that exploits a heuristic based on Allen’s interval algebra to prune the search space to be traversed by a mixed integer program. We empirically show that the proposed scheduler outperforms the state of the art by at least one order of magnitude. Furthermore, the scheduler has been deployed on several mobile robots in long-term autonomy scenarios. Our second main contribution is the POPMERX algorithm, which is based on merging of partially ordered temporal plans. POPMERX first reasons with the spatial and temporal structure of separately generated plans. Then, it merges these plans into a single final plan, while optimising the makespan of the merged plan. We empirically show that POPMERX produces better plans that the-state-ofthe- art planners on temporal domains with time windows.
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Incera, Burkert Sara. "THE TIME COURSE OF A BILINGUAL STROOP TASK." Cleveland State University / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=csu1393608029.
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Mshololo, Felix Hlanganani Engelbert. "The time management task of the school principal." Thesis, University of Zululand, 2014. http://hdl.handle.net/10530/1408.
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A thesis submitted to the Faculty of Education in partial fulfilment of the requirements for the Degree of Master of Education in the Department of Social Science Education at the University of Zululand, South Africa, 2014<br>Effective time utilisation leads to greater freedom to use time as one would like to: to do more of the things one has always wanted to do; in short to enjoy life more. Like in any other business organisation, time for planning, organising, leading and controlling is managed carefully. The principal needs time to perform all the above mentioned tasks. In this study, the author accentuates that it is disconcerting that from time to time, there are schools that do not even have a time table when the schools open at the beginning of the year. It would be interesting to know how much time might be wasted as a result of a lack of planning, lack of priorities, paperwork and reading, meetings, unclear objectives, procrastination, lack of delegation, incompetent subordinates and many other time wasters. The purpose of the study was to determine the school principal’s understanding of the time management task and explore how effective school principals manage time in performing their different tasks. Fifty principals from Phumelela and Umbumbulu Circuits, under the Umlazi District completed a survey questionnaire and semi structured interviews were conducted. The researcher was able to determine the pattern of time usage. The findings revealed that factors hampering time management include among other things meetings that principals have to attend, departmental expectations, visitors, the organisational stress, administrative obligations and inability to differentiate between urgent and important matters to attend to hampers the principal’s time management tasks. The study among other things recommended that the provincial education departments need to provide appropriate training for school governing bodies that a well organised and goal directed system should operate to control school visitors in the schools’ interest.
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Ard, Michael Colin. "On the origin of a response time underadditivity by means of cross-modal task switching, or the redundancy of operations in the configuration of task sets for cross-modal shifts." Diss., [La Jolla] : University of California, San Diego, 2009. http://wwwlib.umi.com/cr/ucsd/fullcit?p3366481.
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Thesis (Ph. D.)--University of California, San Diego, 2009.<br>Title from first page of PDF file (viewed August 20, 2009). Available via ProQuest Digital Dissertations. Vita. Includes bibliographical references (p. 178-184).
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Hendrich, Elisabeth. "Determinants of task order in dual-task situations." Doctoral thesis, Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät II, 2014. http://dx.doi.org/10.18452/17088.
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Werden zwei Aufgaben in einem Doppelaufgaben-Paradigma gleichzeitig bearbeitet, dann treten oft sogenannte Doppelaufgabenkosten auf (längere Reaktionszeiten und/oder höhere Fehlerzahlen). Diese Doppelaufgabenkosten werden durch einen zentralen “Flaschenhals” erklärt, der die gleichzeitige Verarbeitung der beiden Aufgaben an der zentralen Verarbeitungsstufe der Reaktionsauswahl verhindert. Das Ziel der vorliegenden Arbeit war es, einige mögliche Faktoren der Verarbeitungsreihenfolge an diesem Flaschenhals zu untersuchen. Die Studie zeigt, dass die Ankunftszeit am Flaschenhals ein wichtiger Faktor bei der Festlegung der Verarbeitungsreihenfolge ist. Zusätzlich ist der Einfluss der Ankunftszeit auf die Verarbeitungsreihenfolge unabhängig davon, welche der beiden Aufgaben manipuliert wurde um den Einfluss dieser Aufgabe zu untersuchen (visuelle oder auditorische Aufgabe). Ein zweiter Faktor der manipuliert wurde, ist die Instruktion an die Probanden. Die Ergebnisse zeigen, dass unter bestimmten Instruktionsbedingungen kognitive Kontrollprozesse aktiviert zu werden scheinen. Als dritten Faktor wurden Aufgabenanforderungen untersucht, indem eine Aufgabe mit zeitlicher Reihenfolge-Entscheidung mit einer Doppelaufgabe mit zufälliger Aufgabenreihenfolge, d.h.: Bestimmung der zeitlichen Reihenfolge mit der zusätzlichen Anforderung einer Reaktionswahl-Aufgabe, verglichen wurde. Die Ergebnisse dieser Experimente deuten darauf hin, dass die Entscheidung über die zeitliche Reihenfolge der beiden Aufgaben zwischen der Wahrnehmungsstufe und der Reaktionswahlstufe getroffen wird.<br>The simultaneous performance of two tasks in a dual-task paradigm is often accompanied by dual-task costs (longer reaction times and/or higher error rates). These dual-task costs have been explained by the existence of a central bottleneck which prohibits the simultaneous processing of the two tasks at the central response-selection stage of information processing. The aim of the present work was to investigate several of the possible factors which determine the task processing order at this central bottleneck. The study shows that the arrival time of the two tasks at the bottleneck plays an important role in the determination of task order. Additionally, the influence of the arrival time on processing order is independent of the component task which is manipulated to test the influence of that task (i.e., visual & auditory task). A second factor that was manipulated is the instruction given to the participants. The results show that cognitive control processes are activated under certain instruction conditions. As a third factor, task requirements were investigated by comparing a temporal order judgement task with a dual task with random task order (i.e., temporal order judgement with the additional requirement to do a choice-RT task). The results suggest that the decision about the temporal order of the two tasks is located between the perception stage and the response-selection stage of processing.
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Thomas, Kevin Edward. "Factors influencing the accuracy of task completion time estimates." Thesis, University of Plymouth, 2004. http://hdl.handle.net/10026.1/1910.
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Whilst considerable research has found that people tend to underestimate their task completion times (e.g., Buehler et al., 1994), factors that might influence the accuracy of temporal predictions have received little empirical treatment. The research presented in this thesis identified two distinct factors that mediated time estimation accuracy and bias. One factor was task duration, whereas the other factor was the person’s prior experience of the task. There was evidence that having prior experience of performing all or a substantial part of the same task enabled participants to more accurately estimate its duration. Additionally, predictions were more accurate when participants viewed tasks before making time estimates. Contrary to the theory of the planning fallacy (Kahneman & Tversky, 1979), these findings suggest that people do take account of their previous task performance, and use such distributional information to good effect. However, there was evidence of time prediction bias when unrelated tasks were completed beforehand, suggesting that erroneous information about previous task performance was used when making a subsequent estimate. The directional nature of time estimation bias was also highlighted in the present research. In general, there was some evidence of temporal overestimation on tasks with a duration of up to four or five minutes, whereas participants tended to underestimate their completion times on tasks that took between eight and 16 minutes to complete. These findings indicate that task duration influences the direction in which time estimates are biased (i.e., under or overestimation), with the temporal underestimation indicative of the planning fallacy occurring on tasks of at least eight minutes' duration. The present research has potential implications for task duration estimation in everyday life, and outlines conditions under which prediction bias can be reduced. The present findings are discussed in relation to the theory of the planning fallacy and the potential role of cognitive judgemental heuristics in determining temporal misestimation.
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Fisher, Nathan Wayne Baruah Sanjoy K. "The multiprocessor real-time scheduling of general task systems." Chapel Hill, N.C. : University of North Carolina at Chapel Hill, 2007. http://dc.lib.unc.edu/u?/etd,1108.
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Thesis (Ph. D.)--University of North Carolina at Chapel Hill, 2007.<br>Title from electronic title page (viewed Mar. 27, 2008). "... in partial fulfillment of the requirements for the degree of Doctor of Philosophy in the Department of Computer Science." Discipline: Computer Science; Department/School: Computer Science.
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Nicholls, Michael E. R. "The expanded judgement task : an alternative to inspection time? /." Title page, contents and abstract only, 1988. http://web4.library.adelaide.edu.au/theses/09ARPS/09arpsn615.pdf.
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Folds, D. (Dennis). "Response organization and time-sharing in dual-task performance." Diss., Georgia Institute of Technology, 1987. http://hdl.handle.net/1853/28616.
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Ottensmeyer, Mark Peter. "Telerobotic surgery : feedback time delay effects on task assignment." Thesis, Massachusetts Institute of Technology, 1996. http://hdl.handle.net/1721.1/10972.
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Zhou, Hongyi. "Task scheduling and synchronization for multiprocessor real-time systems." Diss., Georgia Institute of Technology, 1992. http://hdl.handle.net/1853/9178.
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Kivelevitch, Elad H. "Robust, Real Time, and Scalable Multi-Agent Task Allocation." University of Cincinnati / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1337007279.
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Wheeler, Kopf Diane Marie 1962. "Time on task observations in consumer and homemaking classrooms." Thesis, The University of Arizona, 1994. http://hdl.handle.net/10150/278398.
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The purpose of this study was to determine teacher and program effectiveness in Consumer and Homemaking Programs in Arizona by using time on task as a measure. In effective program studies, the common critical variable was the individual teacher (Brophy, 1979; McGreal and McGreal, 1986). Teachers who were organized, started class on time and kept the students busy with relevant work maintained high time on task percentages. Using time on task as a measurement of effectiveness, the "Managing Learning Time" instrument (Halasz and Desy, 1984), was used. This study: determined that the majority of students were on task in Arizona Consumer and Homemaking Education classrooms. Time on task was affected more by teacher and classroom practices than by the course content. The focus of the on task behavior varied by subject matter. The majority of time was spent on theory, practice and basic skills in Consumer and Homemaking courses.
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Britton, Matthew Scott. "Stochastic task scheduling in time-critical information delivery systems." Title page, contents and abstract only, 2003. http://web4.library.adelaide.edu.au/theses/09PH/09phb8629.pdf.
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"January 2003" Includes bibliographical references (leaves 120-129) Presents performance analyses of dynamic, stochastic task scheduling policies for a real- time-communications system where tasks lose value as they are delayed in the system.
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Davis, Robert Ian. "On exploiting spare capacity in hard real-time systems." Thesis, University of York, 1995. http://etheses.whiterose.ac.uk/10840/.
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DeDonno, Michael Anthony. "Time Pressure and Decision Making." Cleveland, Ohio : Case Western Reserve University, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=case1232579823.
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Thesis (Ph.D.)--Case Western Reserve University, 2009<br>Title from PDF (viewed on 26 May 2009) Includes abstract Department of Psychology Includes bibliographical references and appendices Available online via the OhioLINK ETD Center
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Jehu, Deborah. "The Effects of Dual-Task Training on Dual-Task Skills in Older Adults." Thesis, Université d'Ottawa / University of Ottawa, 2017. http://hdl.handle.net/10393/36544.
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It is well established that aging is associated with numerous health concerns, including poor balance. Deteriorations in attention demand also place older adults at a greater risk for falls. Emerging experiments have explored the impact of dual-task training programs and have improved dual-tasking in older adults. However, it is unknown whether these performance-related improvements are a function of the intervention itself or the repeated exposure to the testing protocol. Study 1 explored the implications of repeated administration, once per week for 5 weeks, of a protocol involving standing postural sway while concurrently performing reaction time (RT) tasks in older adults. Results revealed that postural sway was stable across testing sessions whereas the difficult RT task gradually improved over time. Study 2 examined the influence of repeated exposure, once per week for 5 weeks, of a protocol involving negotiating a series of obstacles while performing RT tasks in older adults. Participants walked significantly faster with repeated exposure and gradually improved RT. Study 3 investigated the impact of repeated exposure, once per week for 5 weeks, to three functional mobility measures in older adults. It also examined the influence of a 12-week balance and mobility training (BMT) program as well as a 12-week balance and mobility plus cognitive training (BMT+C) program on functional mobility in older adults. Functional mobility served to be stable over time. Both the BMT and BMT+C groups significantly improved functional mobility and sustained these improvements at the 12-week follow-up, while no changes were observed in the control group. No differences between the BMT and BMT+C groups emerged. Experiment 4 examined the influence of BMT and BMT+C on postural sway and RT in older adults. Participants in both training groups significantly improved RT and sustained these improvements at the follow-up, while no changes were observed in the control group. No changes to postural control were shown in any group. No differences between the BMT and BMT+C groups emerged. Experiment 5 examined the influence of BMT and BMT+C on negotiating a series of obstacles while performing RT tasks in older adults. Both the BMT and BMT+C groups significantly improved RT and sustained these improvements at the follow-up, while no changes were observed in the control group. All groups showed faster time to completion of the obstacle series. No differences between the BMT and BMT+C groups emerged. Collectively, these findings suggest that BMT and BMT+C significantly improve functional mobility and divided attention, and sustain these improvements over time. Although some improvements were observed after repeated exposure over 5 weeks, no changes in the control group were observed. Therefore, the improvements exhibited from BMT and BMT+C are likely not a function of repeated exposure to the testing protocol, as participants may be more susceptible to performance-related improvements when the testing sessions are close in proximity. Altogether, these findings propose that, whether or not cognitive training is included, attention demanding dual-task training not only improves functional mobility and RT, but also sustains these improvements over time in older adults. These results may be used to improve the prescription of exercise in older adults.
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Healey, Rick M. "Implicit and explicit learning of a serial reaction time task /." Internet access available to MUN users only, 2003. http://collections.mun.ca/u?/theses,161409.
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Slama, Hichem. "Task-goal switching: Influences of time, language, alertness and expertise." Doctoral thesis, Universite Libre de Bruxelles, 2016. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/229285.
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Almost 100 years ago, Jersild (1927) published his article “Mental Set and Shift”. He borrowed this title from a book of Hollingworth and Poffenberger (1919), according to whom “shifting back and forth from one mental set, one attitude or one task to another, is a relatively ineffective mode of work.” As pointed out by Jersild, the cost of switching between activities or mental sets is, for instance, the reason for Taylor’s model of industrialization and the trend in industry toward specialization. Through specialization, the element of switch is reduced to its minimum because “the cost of shift is loss in efficiency” (Jersild, 1927). However, outside of the factory, switching between multiple tasks is a crucial part of human life and the cost of switching, consequently, impacts our everyday functioning.The main topic of this doctoral dissertation is cognitive flexibility and task switching. The task-switching paradigm requires participants to switch frequently between tasks. Therefore, it measures the capacity of our brain to adapt rapidly according to tasks and goals. Dynamic adaptation according to context and goals is encompassed in cognitive psychology and neurosciences under the term cognitive control. Consequently, the ability to switch between tasks constitutes the part of cognitive control that is needed when the current goal changes and the cognitive system has to adapt. Our experimental contribution aimed at investigating how this task-goal switching can be modulated by factors such as time, language, alertness and expertise. In this introduction, we succinctly review the vast literature about attentional systems, cognitive control and task switching. In the experimental section, we describe the cued match-to-sample task that we developed to investigate task-goal switching and present five experimental studies that address the impact of several factors on task-goal switching. In the general discussion, we summarize our results and consider their implications for cognitive-control and task-switching literatures.<br>Doctorat en Sciences psychologiques et de l'éducation<br>info:eu-repo/semantics/nonPublished
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Faulkner, James. "Perceived exertion, exercise intensity conrol and time to end-task." Thesis, University of Exeter, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.489225.
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The ratings of perceived exertion (RPE) are a widely accepted measure used to quantify, monitor and subjectively regulate an individual's exercise tolerance and level of exertion. Despite recent encouraging findings (Eston et ai, 2005, 2006), the predictive utility of the RPE during estimation and perceptually-regulated exercise tests (production) has been studied infrequently.
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Austin, Theodore Matthew. "A Task Analysis of Metacommunication in Time-Limited Dynamic Psychotherapy." Antioch University / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=antioch1305028242.
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Rahman, Tabassum Tahmina. "Real-Time FNIRS Investigation of Discrete and Continuous Cognitive Demands During Dual-Task Walking." Thesis, Université d'Ottawa / University of Ottawa, 2019. http://hdl.handle.net/10393/39620.
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Younger adults who are walking and doing additional tasks at the same time may not
realize if their performance suffers, putting some at greater risk for injury and impairment during
certain tasks. This thesis has addressed this confound by developing a divided attention paradigm
focusing on discrete and continuous demand manipulations. The work assessed in motorcognitive processing changes with cerebral and behavioral monitoring of over-ground walking
with or without cognitive tasks. Participants (n = 19, 18-35 years, 13 females) were asked to
walk at their usual pace [usual walking condition (SM)], walk at their usual pace while
performing a cognitive task [dual-task condition (DT)] as well as conduct a cognitive task while
standing [single cognitive condition (SC)]. All participants conducted two discrete [simple
response time (SRT) & go-no-go (GNG)] and two continuous cognitive tasks [N-back (NBK) &
double number sequence (DNS)] of increasing demand.
The study revealed significant brain and behavior interactions during the most demanding
continuous cognitive task, the DNS. The findings demonstrated lower accuracy rates, slower
walk speeds as well as greater cerebral oxygenation in DNS DT in comparison to single task
conditions. With increasing cognitive demands and tasks, there were longer response times, as
well as lower accuracy rates. The behavioral findings were qualified by marginally significant
interactions in a 2 x 4 RM ANOVA between SC-DT task and demand for accuracy rate [F (3,
54) = 2.66, p = 0.06, η2 =.13], significant interactions in response time [F (2, 36) = 4.1, p =
0.026, η2 =.18] as well as significant SM-DT task and demand findings for walk speed [F (3, 54)
=5.3, p = 0.003, η2 =.23]. The 2 x 2 x 4 RM ANOVA revealed significant HbO2 interactions
between walking tasks (single and dual), hemisphere and demand [F (3, 54) = 5.730, p = 0.002,
η2 =.24] in the DNS only.
The data suggests that greater demand manipulations with continuous cognitive tasks
may be sensitive to both prefrontal cortex (PFC) and behavioral assessments in younger adults
(YA). Further validation of the discrete-continuous demand paradigm in motor studies may
provide a basis for cognitive assessment with applications in motor learning, cognitive training,
aging and more.
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Feng, Chuning Rouder Jeffrey Neil. "An assessment of inhibition in the Simon task." Diss., Columbia, Mo. : University of Missouri--Columbia, 2009. http://hdl.handle.net/10355/6550.
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The entire thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file; a non-technical public abstract appears in the public.pdf file. Title from PDF of title page (University of Missouri--Columbia, viewed on November 13, 2009). Thesis advisor: Dr. Jeffrey Rouder. Includes bibliographical references.
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Sandnes, Frode Eika. "New approaches to static task graph scheduling for control." Thesis, University of Reading, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.362290.
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Naedele, Martin. "On the modeling and evaluation of real-time systems." [S.l.] : [s.n.], 2000. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=13564.
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Pruneau, Leigh Ann 1957. "All the time is work time: Gender and the task system on antebellum lowcountry rice plantations." Diss., The University of Arizona, 1997. http://hdl.handle.net/10150/282532.
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This is an analysis of the task system, the primary form of labor organization used by South Carolina and Georgia lowcountry rice planters. It examines the labor process of rice field hands, analyzes the extent to which gender shaped enslaved men and women's experiences of tasking, and explores some of the ramifications of task work on field women's lives. Conventional interpretations of the task system claim that it provided slaves with more autonomy, control, and opportunities for individual initiative than gang labor did. In contrast, this study finds that tasking was a multifaceted labor regime whose differences from gang labor were less pronounced than previous scholarship suggests. Specifically, structural, seasonal, and managerial constraints profoundly limited slaves' ability to control their work pace and to independently manage their work routines. As a result, slaves' access to own time and autonomy could be quite limited. Significantly, field hands did not experience these limits equally. Since planters did not adhere to one uniform model of rice cultivation, task assignments and labor routines varied across plantations. This heterogenous organization of task labor meant that slaves' ability to realize tasking's potential for greater slave autonomy was disproportionate across plantation boundaries. Gender also affected slaves' access to own time. Field women's control over the length of their work day and hence over access to own time was particularly circumscribed. The origins of these limits can be found in how planters organized their labor force and allocated field work. Given these constraints, slaves clearly did not gain own time easily. Nevertheless, slaves persevered in their quest for any or more own time by trying to circumvent prescribed work routines. Historians have touted slave family assistance as one of the most important of their strategies. While true, such aid was complex, circumscribed, and sometimes gendered. Finally, I link these labor and aid patterns to field women's reproductive histories and find that they help explain the region's high rate of slave neonatal mortality. These findings provide compelling evidence that we need to lower our assessment of the relative benefits putatively enjoyed by slaves who worked in a task regime.
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Shaeffer, Blanca A. "Refining a task-execution time prediction model for use in MSHN." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2000. http://handle.dtic.mil/100.2/ADA378655.
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Zhang, Xiyue. "Tool for task allocation and scheduling in hard real-time systems." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape17/PQDD_0003/MQ32435.pdf.
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Hatvani, Leo. "Formal Verification of Adaptive Real-Time Systems by Extending Task Automata." Licentiate thesis, Mälardalens högskola, Inbyggda system, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-26129.
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Recently, we have seen an increase in the deployment of safety critical embedded systems in rapidly changing environments, as well as requirement for on-site customizations and rapid adaptation. To address the extended range of requirements, adaptation mechanism are added to the systems to handle large number of situations appropriately. Although necessary, adaptations can cause inconsistent and unstable configurations that must be prevented for the embedded system to remain dependable and safe. Therefore, verifying the behavior of adaptive embedded systems during the design phase of the production process is highly desirable. A hard real time embedded system and its environment can be modeled using timed automata. Such model can describe the system at various levels of abstraction. In this thesis, we model the adaptive responses of a system in terms of tasks that are executed to handle changes in the environmental or internal parameters. Schedulability, a property that all tasks complete execution within their respective deadlines, is a key element in designing hard real-time embedded systems. A system that is unschedulable immediately compromises safety and hard real-time requirements and can cause fatal failure. Given specifications of all tasks in the system, we can model the system, an abstraction of the environment, and adaptive strategies to investigate whether the system retains safety properties, including schedulability, regardless of the changes in the environment and adaptations to those changes.
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KASAM, SUMAN. "FORMAL VERIFICATION OF TIME CONSTRAINED UAV TASK ALLOCATION USING MODEL-CHECKING." University of Cincinnati / OhioLINK, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1201537607.
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Jiang, Xianghong Carleton University Dissertation Engineering Systems and Computer. "Evaluation of approximation for response time of parallel task graph model." Ottawa, 1996.
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Aydin, Alperen Mehmet. "The influence of task and time on information behaviour in organisations." Thesis, University of Leeds, 2015. http://etheses.whiterose.ac.uk/11235/.
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This research is about the information behaviour of organizational members in different contexts while dealing with the work tasks. The objectives of the research are to provide an understanding of information seeking, using, and sharing through illuminating answers to “How is organizations’ information behaviour shaped with regard to time pressure and task complexity?” and “How do organisational members process information in collaborative settings and decide for the next actions in stable vs. unstable environments?” questions. In work settings, tasks are commonly carried out in groups; information is processed in collaborative manner and affected by situational factors (time and complexity). However, relatively small number of articles presents collaborative information behaviour and its link to situational factors. To contribute to the existing literature, the research aims to explore collaborative information behaviour while carrying out tasks in varying complexity and under time pressure. The research uses qualitative methodology. Data have been collected from Cihan News Agency-Istanbul (CIHAN) and Istanbul Metropolitan Municipality Disaster Coordination Centre (AKOM) through field observations and interviews. It is a cross case study exploring the differences and commonalities of the information behaviour in two different contexts and two different situations. The interview transcripts and field observation have been interpreted to explain the decision making mode of the organisational members in dynamic environments and the way they process information; and grounded theory approach is used to construct collaborative information behaviour model for the CIHAN and AKOM contexts. Information behaviour models, which are illuminating collaborative information behaviour (CIB), have been introduced as the first contribution of the research. Time pressure and varying task complexity shape the model through illuminating barriers to access information and complex needs of the tasks carried out. The second contribution lies in clarifying the interaction between information behaviour and decision making type (intuitive vs analytical) under time pressure. Time pressure and the nature of the work tasks drive organisational members to use intuition or analytical mode. Activity Theory has been used as the theoretical framework and methodological tool for the research. Activity Theory has been used to investigate individual information behaviour in the literature. Use of Activity Theory to investigate collaborative information behaviour is the methodological contribution.
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McFarland, Craig. "Frontal Lobe Involvement in a Task of Time-Based Prospective Memory." Thesis, The University of Arizona, 2007. http://hdl.handle.net/10150/193251.
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Time-based prospective memory has been found to be negatively affected by aging, possibly as a result of the declining frontal function that often accompanies aging. In the present study we investigated the role of the frontal lobes in prospective memory. Based upon their scores on a composite measure of frontal function, 32 older adults were characterized as possessing high- or low-frontal function, and were then tested on a time-based laboratory prospective memory task. Overall age effects were also assessed and each of the frontal groups was compared to a group of 32 younger adults. High-frontal functioning participants demonstrated better prospective memory than low-frontal functioning participants, and were not distinguishable from younger adults. The results of this study suggest that it is not aging per se that disrupts prospective memory performance, but it is instead the diminished frontal function seen in a subset of older adults.
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Hillstrom, Rebecca Ann. "Social Networks, Language Acquisition, and Time on Task While Studying Abroad." BYU ScholarsArchive, 2011. https://scholarsarchive.byu.edu/etd/2780.
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This study was designed to collect and evaluate the social networks of 32 study abroad students participating in the 2009 BYU study abroad program in Amman, Jordan. Survey data, language journals, and test scores were analyzed to determine how they successfully built social networks with native speakers, the relationship between students' social networks and time spent using Arabic outside of class, and the relationship between students' social networks and their acquisition of Arabic. The experiment provided a number of insights into how study abroad students meet potential conversation partners, select which relationships to pursue, and develop relationships in order to build social networks. The study also found that the intensity of students' social relationships as well as the number of clusters in their social networks were predictors of language gains. Additionally, the findings show that social network dispersion and the size of the largest cluster in a network predicted time spent using Arabic outside of class.
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Bergman, Gustav. "Visualizing time-on-task in second language learning : A case study." Thesis, KTH, Skolan för elektroteknik och datavetenskap (EECS), 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-259556.
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With globally increased migration and mobility between countries, it has become critical for many people to learn to speak a second language. The focus of this study is on adult migrant language learners that are learning a second language of the host country on the side of their working life. This study aims to support learners in their second language acquisition outside classrooms settings. In particular, it explores how the use of a specially designed application aimed at helping learners to keep track on how much time they spend on studying a second language affects their engagement and motivation to continue study the target language. To support migrant learners keeping track of the time spent on language learning activities (e.g., speaking, writing, reading and listening), a web-based application, the TimeTracker App, accessible through users’ mobile device has been developed by the researcher and offered to the learners. Participants in this study used the application for around two weeks. A mixed method approach was employed: data was collected through semi-structured interviews and by extracting log data from the application’s database. Interview data was analysed by means of a conventional content analysis and log data by using descriptive statistics. Overall, the study’s results show that the use of the TimeTracker App enabled the respondents to feel more aware of how much time they spent on their studies, and inspired them to devote more time to study the target language compared to before using the application. The findings suggest that migrant learners become more motivated and engaged in their second language learning when using the application.<br>Globalt ökad migration och rörlighet mellan länder har gjort det kritiskt för många att lära sig att tala ett andraspråk. Denna studie fokuserar på arbetande migranter som lär sig ett andraspråk vid sidan av sitt arbetsliv. Studien syftar till att stödja de studerande i sitt lärande av ett andraspråk utanför klassrummet. I synnerhet undersöker den hur användningen av en speciellt utformad applikation som syftar till att hjälpa eleverna att hålla reda på hur mycket tid de spenderar på att studera ett andraspråk påverkar deras engagemang och motivation för att fortsätta studera målspråket. För att hjälpa studerande migranter hålla reda på den tid som spenderas på språkinlärning (t ex att tala, skriva, läsa och lyssna) har en webbaserad applikation, TimeTracker App, som är tillgänglig via användarnas mobiltelefon, utvecklats av författaren och erbjudits till eleverna. Deltagarna i denna studie använde applikationen i cirka två veckor. En blandad metod användes: data samlades in genom halvstrukturerade intervjuer och genom att extrahera loggdata från applikationsdatabasen. Intervjudata analyserades med hjälp av en konventionell innehållsanalys och loggdata med hjälp av beskrivande statistik. Sammantaget visar studiens resultat att användningen av TimeTracker App gjorde det möjligt för respondenterna att bli mer medvetna om hur mycket tid de spenderade på sina studier och det inspirerade dem att ägna mer tid att studera målspråket jämfört med innan man använde applikationen. Resultaten tyder på att arbetande migranter blir mer motiverade och engagerade i sitt studerande av ett andraspråk när de använder applikationen.
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Duggan, Geoffrey. "Rumination and time allocation across tasks." Thesis, University of Exeter, 2015. http://hdl.handle.net/10871/18035.
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Background and Objectives: Rumination may contribute to depression by impairing the most effective allocation of time across activities. An experiment tested the role of rumination in time allocation across tasks. Methods: State rumination was manipulated by cueing an unresolved goal in one condition (32 participants) and cueing a resolved goal in another condition (32 participants). Trait rumination and depressive symptoms were also measured. All participants completed two word generation tasks and allocated a fixed overall time budget between the tasks by interleaving between them. Results: No difference was found in task performance or time allocation following the manipulation of state rumination. Self-reported rumination did not differ between conditions throughout the experimental task. Differences in time allocation behaviour were associated with trait rumination. Limitations: Use of a non-clinical population and tasks that are unrepresentative of everyday problem solving limited the generalisability of the results and may have limited the effect of the state rumination manipulation on task performance. Conclusions: The absence of a difference in self-reported rumination throughout the task suggests that either the word generation task reduced levels of rumination or that the level of rumination induced did not have a large effect on the cognitive processes required to complete the word generation task.
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Kennefick, Michael. "Time Course of Corticospinal Excitability in Simple Reaction Time Tasks." Thesis, Université d'Ottawa / University of Ottawa, 2014. http://hdl.handle.net/10393/31504.
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The process of movement execution can be separated into two sections; the foreperiod and the response time. The foreperiod represents the time between the warning signal (WS) and the presentation of the imperative “go” signal, and the response time incorporates both the reaction time (RT) and the movement time (Schmidt & Lee, 2011). Transcranial magnetic stimulation (TMS) was used to probe corticospinal excitability (CE) which has been measured in a variety of RT tasks during both the foreperiod and the response time periods. The purpose of the two studies in this thesis was to measure when and at what rate changes in CE occur in both simple and complex tasks. The results of the first experiment indicated that CE levels quickly increased from baseline with the presentation of the WS. This was followed by a holding period in which CE was held constant until a decline in CE occurred prior to the presentation of the IS. This decline was followed by a rapid increase in CE as the movement was initiated and released. Importantly, even though levels of CE were decreasing relative to the start of the decline, participants were still in a heightened state as they prepared to release their movements. Furthermore, it is suggested that selective inhibitory control mechanisms were at least partly responsible for the decline prior to the IS. The results of the second experiment indicated that MEP amplitudes in a simple task were significantly larger compared to those in a complex task relative to both the IS and the onset of electromyography. These findings suggest that simple and complex tasks achieve differing levels of corticospinal excitability, and it is suggested that the complex requires the use of the cerebellum, which suppresses excitatory projections to the thalamus, and consequently to the motor cortex.
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AULUCK, NITIN. "REAL-TIME SCHEDULING ALGORITHMS FOR PRECEDENCE RELATED TASKS ON HETEROGENEOUS MULTIPROCESSORS." University of Cincinnati / OhioLINK, 2005. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1109288052.
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Fridriksson, Arnar. "Design and Evaluation of a Real-Time Task Scheduler using Tabu Search." Thesis, University of Skövde, Department of Computer Science, 1997. http://urn.kb.se/resolve?urn=urn:nbn:se:his:diva-240.
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<p>Real-time task scheduling problems are generally considered to be NP-hard problems. Therefore it is necessary to apply a heuristic search strategy on these problems. This project focuses on the development of a real-time scheduling algorithm using tabu search.</p><p>A dynamic real-time task scheduling problem is defined for a single processor. The tasks in the system are sporadic, mutually independent, non-preemptable with firm, arbitrary deadlines. This problem is represented with tabu search. For performance measurements a simulator has been designed and implemented. Simulations have been conducted comparing scheduler based on tabu search to two well known scheduling algorithms, namely: earliest deadline first and highest value first. It was expected that the scheduler based on tabu search would outperform highest-value first and it would miss fewer deadlines than earliest deadline, as soon as earliest deadline starts to miss deadlines. The results of the simulations conducted did not show this results. Nevertheless did the simulation results indicate that tabu search could be a suitable heuristic search strategy for real-time task scheduling problems. This project provides a starting point on which it is possible to continue work on enhancing the tabu search scheduler.</p>
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Präntare, Fredrik. "Simultaneous coalition formation and task assignment in a real-time strategy game." Thesis, Linköpings universitet, Artificiell intelligens och integrerade datorsystem, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-139210.
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In this thesis we present an algorithm that is designed to improve the collaborative capabilities of agents that operate in real-time multi-agent systems. Furthermore, we study the coalition formation and task assignment problems in the context of real-time strategy games. More specifically, we design and present a novel anytime algorithm for multi-agent cooperation that efficiently solves the simultaneous coalition formation and assignment problem, in which disjoint coalitions are formed and assigned to independent tasks simultaneously. This problem, that we denote the problem of collaboration formation, is a combinatorial optimization problem that has many real-world applications, including assigning disjoint groups of workers to regions or tasks, and forming cross-functional teams aimed at solving specific problems. The algorithm's performance is evaluated using randomized artificial problems sets of varying complexity and distribution, and also using Europa Universalis 4 – a commercial strategy game in which agents need to cooperate in order to effectively achieve their goals. The agents in such games are expected to decide on actions in real-time, and it is a difficult task to coordinate them. Our algorithm, however, solves the coordination problem in a structured manner. The results from the artificial problem sets demonstrates that our algorithm efficiently solves the problem of collaboration formation, and does so by automatically discarding suboptimal parts of the search space. For instance, in the easiest artificial problem sets with 12 agents and 8 tasks, our algorithm managed to find optimal solutions after only evaluating approximately 0.000003% of the possible solutions. In the hardest of the problem sets with 12 agents and 8 tasks, our algorithm managed to find a 80% efficient solution after only evaluating approximately 0.000006% of the possible solutions.<br>I denna uppsats presenteras en ny algoritm som är designad för att förbättra samarbetsförmågan hos agenter som verkar i realtidssystem. Vi studerar även koalitionsbildnings- och uppgiftstilldelningsproblemen inom realtidsstrategispel, och löser dessa problem optimalt genom att utveckla en effektiv anytime-algoritm som löser det kombinerade koalitionsbildnings- och uppgiftstilldelningsproblemet, inom vilket disjunkta koalitioner formas och tilldelas uppgifter. Detta problem, som vi kallar samarbetsproblemet, är en typ av optimeringsproblem som har många viktiga motsvarigheter i verkligheten, exempelvis för skapandet av arbetsgrupper som skall lösa specifika problem, eller för att ta fram optimala tvärfunktionella team med tilldelade uppgifter. Den presenterade algoritmens prestanda utvärderas dels genom att använda simulerade problem av olika svårighetsgrad, men också genom att använda verkliga problembeskrivningar från det kommersiella strategispelet Europa Universalis 4, vilket är ett spel som agenter måste samarbeta i för att effektivt uppnå deras mål. Att koordinera agenter i sådana spel är svårt, men vår algoritm åstadkommer detta genom att systematiskt söka efter de optimala agentgrupperingarna för ett antal givna uppgifter. Resultaten från de simulerade problemen visar att vår algoritm effektivt löser samarbetsproblemet genom att systematiskt sålla bort suboptimala delar av sökrymden. I dessa tester lyckas vår algoritm generera högkvalitativa anytime-lösningar. Till exempel, i de enklaste problemen med 12 agenter och 8 uppgifter lyckas vår algoritm hitta den optimala lösningen efter det att den endast utvärderat 0.000003% av de möjliga lösningarna. I de svåraste problemen med 12 agenter och 8 uppgifter lyckas vår algoritm hitta en lösning som är 80% från den optimala lösningen efter det att den endast utvärderat 0.000006% av de möjliga samarbetsstrukturerna.
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Swim, Bradley Roy. "Predictable dynamic task scheduling in a hard real-time distributed operating system." Thesis, Staffordshire University, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.337215.
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Choi, Yuk-ming, and 蔡育明. "A run-time hardware task execution framework for FPGA-accelerated heterogeneous cluster." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2013. http://hdl.handle.net/10722/206679.
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The era of big data has led to problems of unprecedented scale and complexity that are challenging the computing capability of conventional computer systems. One way to address the computational and communication challenges of such demanding applications is to incorporate the use of non-conventional hardware accelerators such as FPGAs into existing systems. By providing a mix of FPGAs and conventional CPUs as computing resources in a heterogeneous cluster, a distributed computing environment can be achieved to address the need of both compute-intensive and data-intensive applications. However, utilizing heterogeneous clusters requires application developers’ comprehensive knowledge on both hardware and software. In order to assist programmers to take advantage of the synergy between hardware and software easily, an easy-to-use framework for virtualizing the underlying FPGA computing resources of the heterogeneous cluster is motivated.
In this work, a heterogeneous cluster consisting of both FPGAs and CPUs was built and a framework for managing multiple FPGAs across the cluster was designed. The major contribution of the framework is to provide an abstraction layer between the application developer and the underlying FPGA computing resources, so as to improve the overall design productivity. An inter-FPGA communication system was implemented such that gateware executing on FPGAs can communicate with each other autonomously to the CPU. Furthermore, to demonstrate a real-life application on the heterogeneous cluster, a generic k-means clustering application was implemented, using the MapReduce programming model.
The implementation of the k-means application on multiple FPGAs was compared with a software-only version that was run on a Hadoop multi-core computer cluster. The performance results show that the FPGA version outperforms the Hadoop version across various parameters. An in-depth study on the communication bottleneck presented in the system was also carried out. A number of experiments were specifically designed to benchmark the performance of each I/O channel. The study shows that the major source of I/O bottleneck lies at the communication between the host system and the FPGA. This gives insight into programming considerations of potential applications on the cluster as well as improvement to the framework. Moreover, the benefit of multiple FPGAs was investigated through a series of experiments. Compared with putting all mappers on a single FPGA, it was found that distributing the same amount of mappers across more FPGAs can provide a tradeoff between FPGA resources and I/O performance.<br>published_or_final_version<br>Electrical and Electronic Engineering<br>Master<br>Master of Philosophy
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Ejenstam, Joakim. "Implementing a Time Optimal Task Sequence For Robot Assembly Using Constraint Programming." Thesis, Uppsala universitet, Institutionen för informationsteknologi, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-229581.
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Assembly lines in a lean production environment may persist for months or years, but due to the rapid change in demands on the consumer market they can be subject to quick changes. Robots have been proved to handle tasks that previously were limited to human workers: this is the goal of the flexible two armed robot developed by ABB. When installing a new robot into an assembly line there are several parameters which make it a difficult job for programmers, even experienced ones, to install the robot. These problems lead to long installation processes that can take weeks, and there are great benefits of automating the process of finding good solutions to the problem. In this thesis a constraint programming approach is presented as a way to solve the complex sequencing problem when installing a two armed robot into a new environment. When benchmarked against a reference case study, the implemented prototype solutions showed an improvement of 17%, all within a time limit of 20 minutes instead of weeks. This shows that constraint programming can be a good tool for automating robot installations.
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Thomas, Antonio Lamar. "The Effect of Textbook Format on Mental Effort and Time on Task." Thesis, Walden University, 2014. http://pqdtopen.proquest.com/#viewpdf?dispub=3635935.
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<p> The relatively little amount of time that some college students spend reading their textbooks outside of lectures presents a significant threat to their academic success. One possible solution to this problem is the use of digital games as an alternative to outside-of-class textbook reading, but a review of previous research did not reveal much information on their efficacy when compared to traditional textbooks. Using Astin's theory of student engagement as a framework, the purpose of this quantitative causal-comparative study was to determine whether a significant difference in engagement, as indicated by mental effort and time on task, existed for college students who used a digital game-based textbook versus students who used a traditional print-based textbook. The 54 undergraduate college students in this convenience sample were randomly assigned to one of the two textbook types and completed an activity session at an individual workstation. Time on task was measured with a stopwatch and mental effort with the Mental Effort Scale. The results showed a statistically significant difference in engagement between participants in the digital game-based and traditional print-based textbook groups, Hotelling's <i> T</i><sup>2</sup>(2, 52) = 25.11, <i>p </i>< .001, D<sup> 2</sup>=1.86. In the post hoc analyses, the digital game-based group had significantly higher time on task scores than the traditional print-based textbook group (<i>t</i> = 34.61, <i>p</i> < .001). The mental effort difference was not significant, although the mean mental effort score was higher for the digital game-based group. These results provide evidence of a digital game-based textbook's utility, and may inform college educators in their efforts to support a more diverse group of learners.</p>