29 research outputs found
Coalition of wind power producers with shared storage and arbitrage opportunities
No full textThis paper investigates the advantages of aggregation among Wind Power Producers (WPPs) with shared energy storage. The novelty of our model is that it develops the dichotomy between wind energy, which is viewed as a cheap but volatile asset versus purchased energy, which is interpreted as an expensive but reliable asset.
A further element of novelty is that the proposed model describes opportunities for time and space arbitrage, and can be used as a benchmark to quantify the reduction of aggregate wind energy volatility through joint bidding. Byreformulating the coalitional game as a standard deviation game, we provide insights into how aggregate producers, viewed as a coalition, can mitigate the volatility of their collective wind energy production. Furthermore, we designa profit allocation mechanism for this standard deviation game. We prove that this allocation belongs to the strong
ε-core and investigate the conditions under which ε is null, which implies that the allocation is in the core. We further prove the robustness of this
allocation mechanismin the presence of a mutant under the assumption of homogeneity. The paper concludes with numerical analyses to corroborate the theoretical results
Cooperative control and stability analysis for virtual coupling of rail vehicles
Get PDFCooperative control for rail vehicles is a new idea which builds on existing models and methods developed in the context of flight formation and autonomous ground vehicles. The underlying idea is to assimilate virtually coupled rail vehicles to arrays of mass–spring–dashpot systems. The contribution of this paper is three-fold. First, a novel scheme is proposed which involves a supervisory control for the higher-level planning and a local motion coordination for the lower-level implementation. For the supervisory control, a review of the existing scheduling models and methods based on alternate graphs and a mixed-integer (non)linear program is conducted. For the local coordination, a nonlinear and uncertain model is developed and a constructive method is provided to design a feedback control that stabilizes the vehicle around a desired equilibrium point, in terms of position and velocity. Second, the control design method is extended to the case of multiple virtually coupled vehicles. It is proven that the transient dynamics follows a typical synchronization dynamics. It is also proven that under such control, the whole system of rail vehicles converges to a pre-defined equilibrium point, characterized by a specific velocity and relative distance between vehicles. Conditions for the stability of such equilibrium points are investigated. Third, under the hypothesis of homogeneity, bounds on the damping coefficient for the synchronization equilibrium (in terms of velocity and relative distance between vehicles) to be overdamped or underdamped are provided
Speeding-up graph processing on shared-memory platforms by optimizing scheduling and compute
Get PDFSubmission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2023-12-01The student, Azin Heidarshenas, accepted the attached license on 2021-12-01 at 14:42.The student, Azin Heidarshenas, submitted this Dissertation for approval on 2021-12-01 at 15:02.This Dissertation was approved for publication on 2021-12-02 at 15:20.DSpace SAF Submission Ingestion Package generated from Vireo submission #17337 on 2022-04-29 at 16:10:18Made available in DSpace on 2022-04-29T21:58:36Z (GMT). No. of bitstreams: 3
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Reason: Author requested closed access (OA after 2yrs) in Vireo ETD systemAuthor requested closed access (OA after 2yrs) in Vireo ETD systemLimitedGraph processing workloads are being widely used in many domains such as computational biology, social network analysis, and financial analysis. As DRAM technology scales down into higher densities, shared-memory platforms gain increasing importance in handling large graph sizes.
We study two main categories of graph algorithms from an implementation perspective. Topology-driven algorithms process all vertices of the graph at each iteration, while data-driven algorithms only process those vertices that make a substantial contribution to the output. Furthermore, the performance of a graph algorithm execution can be broken down into three components, namely, pre-processing, compute, and scheduling. For data-driven algorithms, the work of each thread is driven by the dependencies between vertex values that are known only at run-time. Hence, the scheduling will take a significant portion of execution. However, for topology-driven algorithms, the scheduling time is negligible since the work of each thread can be determined at compile-time.
In this dissertation, we present three techniques to address the performance bottlenecks in both data-driven and topology-driven algorithms. First, we present Snug, which is a chip-level architecture that mitigates the trade-off between synchronization and wasted work in data-driven algorithms. Second, we present V-Combiner, which is a software-only technique to mitigate the trade-off between performance and accuracy of topology-driven algorithms using novel vertex-merging and recovery mechanisms. Finally, we present KeepCompressed, which is a set of algorithms to speed-up compute for topology-driven algorithms using vertex clustering for dynamic graphs
Architectural support for work-efficient relaxed priority queueing
Get PDFLimited Restriction set for Item 102680 on 2019-04-29T15:20:14Z with date 2020-08-10 by [email protected] Restriction set for Item 102680 on 2019-04-29T15:20:29Z with date 2020-08-10 by [email protected] parallel algorithms in domains such as graph analytics and simulations execute more efficiently if some parallel tasks are executed before others. To implement such priority-based task scheduling, the data structure of choice is a concurrent priority queue (PQ). Unfortunately, PQ algorithms exhibit an undesirable tradeoff. On one hand, traditional PQs always dequeue the highest-priority task, and thus fail to scale because of contention at the head of the queue. On the other hand, relaxed PQs avoid contention by dequeuing tasks that are often so far from the head that the resulting schedule misses the benefit of priority-based scheduling.
This thesis proposes novel architectural support for relaxing PQs without straying far from the priority-based schedule. Our architecture, called Snug, distributes the PQ and maintains a set of Work Registers that point to the highest-priority task in each subqueue. Snug provides an instruction that picks a high-quality task to execute. The instruction periodically switches between visiting all the subqueues to get an accurate global snapshot and visiting nearby subqueues to reduce traffic. Overall, Snug dequeues highquality tasks while simultaneously avoiding hotspots and excessive network traffic. We evaluate Snug on graph analytics and event simulation applications. Snug reduces the average execution time of the applications by 1.6×, 4.9× and 3.4× compared to the state-of-the-art skip list, SprayList, and software-distributed PQs, respectively.Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2019-05-01The student, Azin Heidarshenas, accepted the attached license on 2017-04-25 at 14:25.The student, Azin Heidarshenas, submitted this Thesis for approval on 2017-04-25 at 14:26.This Thesis was approved for publication on 2017-04-26 at 09:10.DSpace SAF Submission Ingestion Package generated from Vireo submission #11021 on 2017-08-10 at 14:32:33Made available in DSpace on 2017-08-10T19:52:22Z (GMT). No. of bitstreams: 2
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Previous issue date: 2017-04-26Embargo set by: Colleen Fallaw for item 102680
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Reason: Author requested closed access (OA after 2yrs) in Vireo ETD systemLimited Restriction set for Item 102680 on 2019-04-29T15:20:40Z with date 2020-08-10 by [email protected] Restriction set for Item 102680 on 2019-04-29T15:20:43Z with date 2020-08-10 by [email protected] Restriction set for Item 102680 on 2019-04-29T15:20:46Z with date 2020-08-10 by [email protected] Restriction Lifted for Item 102680 on 2020-08-10T09:15:09Z
Polyphony in the novel The Daughter of the Peasant, you lost the work to Azin using the approach of dialogue
No full textAbstract This research applies Bakhtin’s views and ideas, especially dialogism theory, to critically analyze the discourse in the novel “The Peasant’s Daughter” by the contemporary Iranian novelist Beh Azin to reflect on the polyphony of this novel. This study answers the following questions: 1- How do women in the novel appear dynamically in polyphony? 2. How does the conflict between modernity and tradition appear in polyphony in the novel? 3. How do intellectuals and elites influence the emergence of polyphony in the novel? The results show women were passive to represent polyphony, providing a narrative context for the dominant picture of the protagonist’s discourse. The elites in the story use polyphony for various reasons because of left-wing and nationalist ideologies. The confrontation between tradition and modernity plays no small part in the emergence of this uprising, in which tradition helped the wealthy classes to institutionalize themselves in society. In conclusion, social background and gender are two prominent issues in the story’s narration of The Peasant Girl. The author challenges traditional society’s ideological and moral roots while establishing polyphony between the bourgeoisie and the subjugated classes
RUMBA: Runtime Monitoring and Behavioral Analysis Framework for Java Software Systems
Get PDFI hereby declare that I am the sole author of this thesis. This is a true copy of the thesis, including any required final revisions, as accepted by my examiners. I understand that my thesis may be made electronically available to the public. ii A goal of runtime monitoring is to observe software execution to determine whether it complies with its intended behavior. Monitoring allows one to analyze and recover from detected faults, providing prevention activities against catastrophic failure. Although runtime monitoring has been in use for so many years, there is renewed interest in its application largely because of the increasing complexity and ubiquitous nature of software systems. To address such a demand for runtime monitoring and behavioral analysis of software systems, we present RUMBA framework. It utilizes a synergy between static and dynamic analyses to evaluate whether a program behavior complies with specified properties dur-ing its execution. The framework is comprised of three steps, namely: i) Extractin
Architectural support for work-efficient relaxed priority queueing
No full textMany parallel algorithms in domains such as graph analytics and simulations execute more efficiently if some parallel tasks are executed before others. To implement such priority-based task scheduling, the data structure of choice is a concurrent priority queue (PQ). Unfortunately, PQ algorithms exhibit an undesirable tradeoff. On one hand, traditional PQs always dequeue the highest-priority task, and thus fail to scale because of contention at the head of the queue. On the other hand, relaxed PQs avoid contention by dequeuing tasks that are often so far from the head that the resulting schedule misses the benefit of priority-based scheduling.
This thesis proposes novel architectural support for relaxing PQs without straying far from the priority-based schedule. Our architecture, called Snug, distributes the PQ and maintains a set of Work Registers that point to the highest-priority task in each subqueue. Snug provides an instruction that picks a high-quality task to execute. The instruction periodically switches between visiting all the subqueues to get an accurate global snapshot and visiting nearby subqueues to reduce traffic. Overall, Snug dequeues highquality tasks while simultaneously avoiding hotspots and excessive network traffic. We evaluate Snug on graph analytics and event simulation applications. Snug reduces the average execution time of the applications by 1.6×, 4.9× and 3.4× compared to the state-of-the-art skip list, SprayList, and software-distributed PQs, respectively.LimitedAuthor requested closed access (OA after 2yrs) in Vireo ETD system. Author then requested an extension of closed access for 1 year
The Persian ney: A study of the instrument and its musical style
No full textIn view of the fact that the Ney-e Haftband is the only wind tradition in classical Persian music, the lack of attention paid to it in previous scholarly studies is rather surprising. This dissertation is a study of the Persian ney and its music as it emerged in the city of Esfehan during the nineteenth century.It provides a comprehensive body of information related to the structure of the instrument, its playing techniques, and its use in current musical practices. It discusses the development of the Persian technique by Nayeb Assdollah, the famous ney player of the Nasseri court, and how his new technique of sound production, the 'tooth and lip' technique, provided possibilities for development and change in the musical style of the ney. An extended section discusses the role of Ostad Hassan Kassai in the dissemination of current musical practices on the ney. Kassai's ideas and concepts about poetry and musical pulse have established definite styles in the tradition of ney playing and have resulted in the incorporation of many elements from both vocal music and the music of string instruments.The second section of the study includes an analytical discussion of 17 performances of classical Persian music by four of Iran's current ney players. It also includes a few performances by some former musicians in order to cover earlier trends in the practice of the ney. The performances are from the dastgahs of Shur, Segah, Mahur, and Chahargah. The analyses cover the choice of gushes and how these choices are affected by their adaptability to the specific characteristics of the ney. The dominant and principal gushes of each performance are transcribed in an attempt to understand how the musical content of each gushe compares or contrasts to its original form in radif books.The study has found that the structure of the ney does determine to a large extent, the process of improvisation and the selection of gushes in performances. However, despite substantial variety, improvisations on the ney are found to be compatible with the practice of radif on other instruments, and that previous assumptions regarding an autonomy in the radif of ney is not valid. Moreover, the use of gushes and the specific roles assigned to them coincide, for the most part, with their traditional use in radif books. In conclusion, the study has determined that the music of the ney belongs to a musical system which stresses individual traditions, but at the same time is unified by closely related structures and symbols.Made available in DSpace on 2011-05-07T12:59:09Z (GMT). No. of bitstreams: 2
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Durability evaluation method for contact component interconnections in printed circuit boards under thermal loads
No full textEvaluating Extracorporeal Membrane Oxygenation and Ventilation Treatment of Patients with COVID-19: A Review
Get PDFThe prevalence of COVID-19 in the world is rapidly increasing. Although some patients show mild symptoms of the virus, some others need special care due to the exacerbation of the disease. Therefore, invasive treatments are needed to treat these patients. Data were collected from PubMed and Google scholars at various time points up to the 2020 academic year. The related keywords are listed as follows: "COVID-19", "Treatment", "Pathogenesis", and "Lung disorder". Studies have shown that although the use of ECMO and ventilation can provide oxygen to patients and improve their clinical status; these procedures can lead to the activation of inflammatory responses and the activation of the renin-angiotensin system. Inflammation and activation of the renin-angiotensin system are among the weak prognoses for COVID-19-infected patients. ECMO and ventilation treatment procedures are like double-edged swords, and monitoring patients during treatment is essential to prevent renin-angiotensin activation.
*Corresponding Author: Zahra Gatavizadeh; Email: [email protected]
Please cite this article as: Hybar H, Samimi A, Maniati M, Jodat J, Gatavizadeh Z. Evaluating Extracorporeal Membrane Oxygenation and Ventilation Treatment of Patients with COVID-19: A Review. Arch Med Lab Sci. 2020;6:1-6 (e16). https://doi.org/10.22037/amls.v6.3355
