Relevant bibliographies by topics / EVT

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'EVT'

Author: Grafiati
Published: 4 June 2021
Last updated: 29 January 2023

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the lists of relevant articles, books, theses, conference reports, and other scholarly sources on the topic 'EVT.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Journal articles on the topic "EVT"

1

Huang, Hsuan-Li. "Pre-EVT Evaluation, Intra-EVT Guidance, Post-EVT Follow-Up of Duplex Ultrasound for Low Extremity Arterial Disease (LEAD)." Ultrasound in Medicine & Biology 43 (2017): S59. http://dx.doi.org/10.1016/j.ultrasmedbio.2017.08.1147.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Honig, Asaf, Hen Hallevi, Naaem Simaan, Tzvika Sacagiu, Estelle Seyman, Andrei Filioglo, Moshe J. Gomori, et al. "Safety and Efficacy of Intravenous Alteplase before Endovascular Thrombectomy: A Pooled Analysis with Focus on the Elderly." Journal of Clinical Medicine 11, no. 13 (June 26, 2022): 3681. http://dx.doi.org/10.3390/jcm11133681.

Full text
Abstract:
Current guidelines advocate intravenous thrombolysis (IVT) prior to endovascular thrombectomy (EVT) for all patients with acute ischemic stroke (AIS) due to large vessel occlusion (LVO). We evaluated outcomes with and without IVT pretreatment. Our institutional protocols allow AIS patients presenting early (<4 h from onset or last seen normal) who have an Alberta Stroke Program Early CT Score (ASPECTS) ≥6 to undergo EVT without IVT pretreatment if the endovascular team is in the hospital (direct EVT). Rates of recanalization and hemorrhagic transformation (HT) and neurological outcomes were retrospectively compared in consecutive patients undergoing IVT+EVT vs. direct EVT with subanalyses in those ≥80 years and ≥85 years. In the overall cohort (IVT+EVT = 147, direct EVT = 162), and in subsets of patients ≥80 years (IVT+EVT = 51, direct EVT = 50) and ≥85 years (IVT+EVT = 19, direct EVT = 32), the IVT+EVT cohort and the direct EVT group had similar baseline characteristics, underwent EVT after a comparable interval from symptom onset, and reached similar rates of target vessel recanalization. No differences were observed in the HT frequency, or in disability at discharge or after 90 days. Patients receiving direct EVT underwent more stenting of the carotid artery due to stenosis during the EVT procedure (22% vs. 6%, p = 0.001). Direct EVT and IVT+EVT had comparable neurological outcomes in the overall cohort and in the subgroups of patients ≥80 and ≥85 years, suggesting that direct EVT should be considered in patients with an elevated risk for HT.
APA, Harvard, Vancouver, ISO, and other styles
3

Purrucker, Jan C., Peter A. Ringleb, Fatih Seker, Arne Potreck, Simon Nagel, Silvia Schönenberger, Anne Berberich, Ulf Neuberger, Markus Möhlenbruch, and Charlotte Weyland. "Leaving the day behind: endovascular therapy beyond 24 h in acute stroke of the anterior and posterior circulation." Therapeutic Advances in Neurological Disorders 15 (January 2022): 175628642211010. http://dx.doi.org/10.1177/17562864221101083.

Full text
Abstract:
Background: There is little evidence of endovascular therapy (EVT) being performed in acute ischemic stroke beyond 24 h, and that evidence is limited to anterior circulation stroke. Objective: To extend evidence of efficacy and safety of EVT after more than 24 h in both anterior and posterior circulation stroke. Methods: Local, prospectively collected registries were screened for patients with acute ischemic stroke and large-vessel occlusion who had received either EVT > 24 h after last-seen-well but <24 h after symptom recognition (EVT>24LSW) or EVT > 24 h since first (definitive) symptom recognition (EVT>24DEF). Patients treated <24 h served as a group for comparison. Favorable outcome was defined as modified Rankin scale (mRS) 0–2 or return to prestroke mRS at 3 months. Results: Between January 2014 and August 2021, N = 2347 were treated with EVT at our comprehensive stroke center, of whom n = 43 met the inclusion criteria (EVT>24LSW, n = 16, EVT>24DEF, n = 27). EVT>24LSW patients were treated at a median of 28.7 h [interquartile range (IQR) = 27.3–32.8] after last-seen-well and 7.3 h (IQR = 2.8–14.3) after symptom recognition; EVT>24DEF patients were treated 52.5 h (IQR = 26.5–94.2) after first symptoms. Favorable outcome was achieved by 23.3% (10/43) in the EVT > 24 compared with 39.4% (886/2250) in the EVT < 24 group ( p = 0.04). Bleeding rates were similar across groups. Mortality was also similar [EVT > 24, 27.9% (12/43) versus EVT < 24, 25.7% (584/2264), p = 0.727; posterior circulation, EVT > 24, 41.7% (5/12) versus EVT < 24, 36.5% (92/252) p = 0.764]. Conclusion: In selected patients, EVT seems effective and safe beyond 24 h for both anterior and posterior circulation stroke.
APA, Harvard, Vancouver, ISO, and other styles
4

Tilburgs, Tamara, Angela Crespo, Anita van der Zwan, Ashley Moffett, and Jack Strominger. "Human HLA-G+ extravillous trophoblasts: immune activating cells that interact with decidual leucocytes (MUC2P.921)." Journal of Immunology 194, no. 1_Supplement (May 1, 2015): 65.4. http://dx.doi.org/10.4049/jimmunol.194.supp.65.4.

Full text
Abstract:
Abstract Invading HLA-G+ extravillous trophoblasts (EVT) are believed to play a key role in the prevention of a maternal immune attack on foreign fetal tissues. EVT are difficult to study due to their low frequency and lack of proliferative capacity. Here highly purified HLA-G+ EVT and HLA-G- villous trophoblast (VT) were isolated. Culture on fibronectin increased HLA-G expression on EVT but differentiation from VT into EVT was not observed. Moreover microarray analysis demonstrated that VT and EVT have more than 4200 differentially expressed genes. Functional gene set enrichment analysis (GSEA) revealed a striking immune activating potential for EVT that is absent in VT. Co-culture of HLA-G+ EVT with sample matched decidual NK, macrophages, CD4+ and CD8+ T cells were established and demonstrated interactions of all leukocyte types with EVT. Interaction of EVT with CD4+ T cells resulted in increased proportion of CD4+CD25hiFOXP3+ Tregs and increased FOXP3 protein level in these cells. However, EVT did not enhance cytokine secretion in dNK whereas stimulation of dNK using mitogens or classical NK targets confirmed the distinct cytokine profiles of dNK and pNK. Thus EVT are specialized cells with an immune activating profile whose properties are not imitated by HLA-G expressing cell lines. Careful validation of EVT-leukocyte interactions using primary HLA-G+ EVT needs to be carried out to understand the unique contribution of EVT to the decidual immune response in human pregnancy.
APA, Harvard, Vancouver, ISO, and other styles
5

Sarraj, Amrou, Sean Savitz, Deep Pujara, Haris Kamal, Kirsten Carroll, Faris Shaker, Sujan Reddy, et al. "Endovascular Thrombectomy for Acute Ischemic Strokes." Stroke 51, no. 4 (April 2020): 1207–17. http://dx.doi.org/10.1161/strokeaha.120.028850.

Full text
Abstract:
Background and Purpose— Timely access to endovascular thrombectomy (EVT) centers is vital for best acute ischemic stroke outcomes. Methods— US stroke-treating centers were mapped utilizing geo-mapping and stratified into non-EVT or EVT if they reported ≥1 acute ischemic stroke thrombectomy code in 2017 to Center for Medicare and Medicaid Services. Direct EVT-access, defined as the population with the closest facility being an EVT-center, was calculated from validated trauma-models adapted for stroke. Current 15- and 30-minute access were described nationwide and at state-level with emphasis on 4 states (TX, NY, CA, IL). Two optimization models were utilized. Model-A used a greedy algorithm to capture the largest population with direct access when flipping 10% and 20% non-EVT to EVT-centers to maximize access. Model-B used bypassing methodology to directly transport patients to the nearest EVT centers if the drive-time difference from the geo-centroid to hospital was within 15 minutes from the geo-centroid to the closest non-EVT center. Results— Of 1941 stroke-centers, 713 (37%) were EVT. Approximately 61 million (19.8%) Americans have direct EVT access within 15 minutes while 95 million (30.9%) within 30 minutes. There were 65 (43%) EVT centers in TX with 22% of the population currently within 15-minute access. Flipping 10% hospitals with top population density improved access to 30.8%, while bypassing resulted in 45.5% having direct access to EVT centers. Similar results were found in NY (current, 20.9%; flipping, 34.7%; bypassing, 50.4%), CA (current, 25.5%; flipping, 37.3%; bypassing, 53.9%), and IL (current, 15.3%; flipping, 21.9%; bypassing, 34.6%). Nationwide, the current direct access within 15 minutes of 19.8% increased by 7.5% by flipping the top 10% non-EVT to EVT-capable in all states. Bypassing non-EVT centers by 15 minutes resulted in a 16.7% gain in coverage. Conclusions— EVT-access within 15 minutes is limited to less than one-fifth of the US population. Optimization methodologies that increase EVT centers or bypass non-EVT to the closest EVT center both showed enhanced access. Results varied by states based on the population size and density. However, bypass showed more potential for maximizing direct EVT-access. National and state efforts should focus on identifying gaps and tailoring solutions to improve EVT-access.
APA, Harvard, Vancouver, ISO, and other styles
6

Hassan, Ameer E., Hari Kotta, Leeroy Garza, Laurie Preston, Wondwossen Tekle, Amrou Sarraj, and Adnan I. Qureshi. "Pre-thrombectomy intravenous thrombolytics are associated with increased hospital bills without improved outcomes compared with mechanical thrombectomy alone." Journal of NeuroInterventional Surgery 11, no. 12 (May 18, 2019): 1187–90. http://dx.doi.org/10.1136/neurintsurg-2019-014837.

Full text
Abstract:
ObjectiveTo investigate whether significant differences exist in hospital bills and patient outcomes between patients who undergo endovascular thrombectomy (EVT) alone and those who undergo EVT with pretreatment intravenous tissue plasminogen activator (IV tPA).MethodsWe retrospectively grouped patients in an EVT database into those who underwent EVT alone and those who underwent EVT with pretreatment IV tPA (EVT+IV tPA). Hospital encounter charges (obtained via the hospital’s charge capture process), final patient bills (ie, negotiated final bills as per insurance/Medicare rates), demographic information, existing comorbidities, admission and discharge National Institutes of Health Stroke Scale (NIHSS) score, and functional independence data (modified Rankin Scale score 0–2) were collected. Univariate and multivariate statistical analyses were performed.ResultsOf a total of 254 patients, 96 (37.8%) underwent EVT+IV tPA. Median NIHSS score at admission was significantly higher in the EVT+IV tPA group than in the EVT group (p=0.006). After adjusting for NIHSS admission score, patient bills and encounter charges in the EVT+IV tPA group were still found to be $3861.64 (95% CI $658.84 to $7064.45, p=0.02) and $158 071.29 (95% CI $134 641.50 to $181 501.08, p < 0.001) greater than in the EVT only group respectively. The EVT+IV tPA group had a higher complication rate of intracranial hemorrhage (ICH) (p=0.005). The EVT and EVT+IV tPA groups did not differ significantly in median discharge NIHSS score (p=0.56), functional independence rate at 90 days (p=0.96), or average length of hospital stay (p=0.21).ConclusionPatients treated with EVT+IV tPA have greater hospital encounter charges and final hospital bills as well as higher rates of ICH than patients who undergo treatment with EVT only.
APA, Harvard, Vancouver, ISO, and other styles
7

Kim, Byungjun, Byung Moon Kim, Oh Young Bang, Jang-Hyun Baek, Ji Hoe Heo, Hyo Suk Nam, Young Dae Kim, et al. "Carotid Artery Stenting and Intracranial Thrombectomy for Tandem Cervical and Intracranial Artery Occlusions." Neurosurgery 86, no. 2 (March 8, 2019): 213–20. http://dx.doi.org/10.1093/neuros/nyz026.

Full text
Abstract:
Abstract BACKGROUND It remains controversial whether carotid artery stenting (CAS) is needed in cases of tandem cervical internal carotid artery occlusion (cICAO) and intracranial large vessel occlusion (LVO). OBJECTIVE To investigate the efficacy and safety of CAS in combination with endovascular thrombectomy (CAS-EVT) in cICAO-LVO patients and to compare its outcomes with those of EVT without CAS (EVT-alone). METHODS We identified all patients who underwent EVT for tandem cICAO-LVO from the prospectively maintained registries of 17 stroke centers. Patients were classified into 2 groups: CAS-EVT and EVT-alone. Clinical characteristics and procedural and clinical outcomes were compared between 2 groups. We tested whether CAS-EVT strategy was independently associated with recanalization success. RESULTS Of the 955 patients who underwent EVT, 75 patients (7.9%) had cICAO-LVO. Fifty-six patients underwent CAS-EVT (74.6%), and the remaining 19 patients underwent EVT-alone (25.4%). The recanalization (94.6% vs 63.2%, P = .002) and good outcome rates (64.3% vs 26.3%, P = .007) were significantly higher in the CAS-EVT than in the EVT-alone. Mortality was significantly lower in the CAS-EVT (7.1% vs 21.6%, P = .014). There was no significant difference in the rate of symptomatic intracranial hemorrhage between 2 groups (10.7 vs 15.8%; P = .684) and according to the use of glycoprotein IIb/IIIa inhibitor (10.0% vs 12.3%; P = .999) or antiplatelet medications (10.2% vs 18.8%; P = .392). CAS-EVT strategy remained independently associated with recanalization success (odds ratio: 24.844; 95% confidence interval: 1.445-427.187). CONCLUSION CAS-EVT strategy seemed to be effective and safe in cases of tandem cICAO-LVO. CAS-EVT strategy was associated with recanalization success, resulting in better clinical outcome.
APA, Harvard, Vancouver, ISO, and other styles
8

Yang, Hua Yun. "Research on the Test Methods of Electronic Voltage Transformer under Complex Field Environment." Applied Mechanics and Materials 568-570 (June 2014): 478–82. http://dx.doi.org/10.4028/www.scientific.net/amm.568-570.478.

Full text
Abstract:
EVT (electronic voltage transformer) is one of the key devices of the intelligent substation. This paper introduces the basic principles of EVT error tests. By analyzing the test environment of EVT with GIS structure, this paper establishes the high-voltage side equivalent circuit for the field EVT calibration methods and proposes to carry out field boost for the EVT with GIS structure, which could effectively improve the field calibration efficiency of EVT. Based on the research on the complex field environment of EVT, this paper puts forward the field test methods of EVT with AIS structure and the results show the effectiveness and correctness of this study.
APA, Harvard, Vancouver, ISO, and other styles
9

Paul, Samit, and Prateek Sharma. "Quantile forecasts using the Realized GARCH-EVT approach." Studies in Economics and Finance 35, no. 4 (October 1, 2018): 481–504. http://dx.doi.org/10.1108/sef-09-2016-0236.

Full text
Abstract:
PurposeThis study aims to implement a novel approach of using the Realized generalized autoregressive conditional heteroskedasticity (GARCH) model within the conditional extreme value theory (EVT) framework to generate quantile forecasts. The Realized GARCH-EVT models are estimated with different realized volatility measures. The forecasting ability of the Realized GARCH-EVT models is compared with that of the standard GARCH-EVT models.Design/methodology/approachOne-step-ahead forecasts of Value-at-Risk (VaR) and expected shortfall (ES) for five European stock indices, using different two-stage GARCH-EVT models, are generated. The forecasting ability of the standard GARCH-EVT model and the asymmetric exponential GARCH (EGARCH)-EVT model is compared with that of the Realized GARCH-EVT model. Additionally, five realized volatility measures are used to test whether the choice of realized volatility measure affects the forecasting performance of the Realized GARCH-EVT model.FindingsIn terms of the out-of-sample comparisons, the Realized GARCH-EVT models generally outperform the standard GARCH-EVT and EGARCH-EVT models. However, the choice of the realized estimator does not affect the forecasting ability of the Realized GARCH-EVT model.Originality/valueIt is one of the earliest implementations of the two-stage Realized GARCH-EVT model for generating quantile forecasts. To the best of the authors’ knowledge, this is the first study that compares the performance of different realized estimators within Realized GARCH-EVT framework. In the context of high-frequency data-based forecasting studies, a sample period of around 11 years is reasonably large. More importantly, the data set has a cross-sectional dimension with multiple European stock indices, whereas most of the earlier studies are based on the US market.
APA, Harvard, Vancouver, ISO, and other styles
10

Wee, Chee-Keong, William McAuliffe, Constantine C. Phatouros, Timothy J. Phillips, David Blacker, Tejinder P. Singh, Ellen Baker, and Graeme J. Hankey. "Outcomes of Endovascular Thrombectomy with and without Thrombolysis for Acute Large Artery Ischaemic Stroke at a Tertiary Stroke Centre." Cerebrovascular Diseases Extra 7, no. 2 (May 2, 2017): 95–102. http://dx.doi.org/10.1159/000470855.

Full text
Abstract:
Background and Purpose: Endovascular thrombectomy (EVT) improves the functional outcome when added to best medical therapy, including alteplase, in patients with acute ischaemic stroke secondary to large vessel occlusion (LVO) in the anterior circulation. However, the evidence for EVT in alteplase-ineligible patients is less compelling. It is also uncertain whether alteplase is necessary in patients with successful recanalization by EVT, as the treatment effect of EVT may be so powerful that bridging alteplase may not add to efficacy and may compromise safety by increasing bleeding risks. We aimed to survey the proportion of patients suitable for EVT who are alteplase-ineligible and to compare the safety and effectiveness of standard care of acute large artery ischaemic stroke by EVT plus thrombolysis with that of EVT alone in a tertiary hospital clinical stroke service. Methods: We performed a retrospective analysis of acute ischaemic stroke patients treated with EVT at our centre between October 2013 and April 2016, based on a registry with prospective and consecutive patient collection. Individual patient records were retrieved for review. Significant early neurological improvement was defined as a NIHSS score of 0–1, or a decrease from baseline of ≤8, at 24 h after stroke onset. Results: Fifty patients with acute ischaemic stroke secondary to LVO in the anterior circulation received EVT in this period, of whom 21 (42%) received concurrent alteplase and 29 (58%) EVT alone. The 2 groups had similar baseline characteristics and similar outcomes. Significant neurological improvement at 24 h occurred in 47.6% of the patients with EVT and bridging alteplase and in 51.7% of the patients with EVT alone (p = 0.774). Mortality during acute hospitalization was 20% for the bridging alteplase group versus 7.1% for EVT alone (p = 0.184). Intracranial haemorrhage rates were 14.3% for bridging alteplase versus 20.7% for EVT alone (p = 0.716). Local complications, groin haematoma (23.8 vs. 10.3%) and groin pseudoaneurysms (4.8 vs. 0%) (p = 0.170), were not significantly different. Conclusion: Our study highlights the relatively large proportion of patients suitable for EVT who have a contraindication to alteplase and raises the hypothesis that adding alteplase to successful EVT may not be necessary to optimize functional outcome. The results are consistent with observational data from other endovascular centres and support a randomised controlled trial of EVT versus EVT with bridging alteplase.
APA, Harvard, Vancouver, ISO, and other styles
More sources

Dissertations / Theses on the topic "EVT"

1

Hellqvist, Olof. "Förstudie till införandet av centralt loggsystem hos Försvarsmakten." Thesis, Karlstads universitet, Fakulteten för ekonomi, kommunikation och IT, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-7885.

Full text
Abstract:
Modern IT systems tend to become more and more complex, while the number of active systems in companies increases. Furthermore, the number of security-related incidents is at an all-time high. These new conditions impose new demands on organizations. For example, it is no longer possible to manually collect and examine the systems log messages. The purpose of this thesis has been to make a comprehensive study of solutions for automated collecting and managing of log messages, analyze the Swedish Armed Forces specification for solutions for central log collection and management, and evaluating exis- ting solutions. The work consisted primarily of literature studies and evaluations of two of the Swedish Armed Forces of selected products: NetIQ Security Manager and Splunk. The conclusion was that neither of the two products met the non-optional requirements posed by the specification. I personally think that the Swedish Armed Forces’ requirements specification for the central log management is far too strict and should hence be revised. A number of requirements in the current specification can be removed. Other requirements should be reformulated and/or re-evaluated.
Moderna IT-system tenderar att bli mer och mer komplexa, samtidigt som antalet ak- tiva system i ett fo ̈retag o ̈kar. Vidare a ̈r antalet sa ̈kerhetsrelaterade incidenter ho ̈gre a ̈n n ̊agonsin. Dessa nya omsta ̈ndigheter sta ̈ller nya krav p ̊a organisationer. Exempelvis a ̈r det inte la ̈ngre mo ̈jligt att manuellt samla in och granska systemens loggmeddelanden. Avsikten med den ha ̈r uppsatsen har varit att go ̈r en o ̈vergripande granskning av lo ̈sningar fo ̈r automatisk insamling och analys av loggmeddelanden, analysera de krav som Fo ̈rsvarsmakten sta ̈ller p ̊a lo ̈sningar fo ̈r central logghantering, samt utva ̈rdera befintliga lo ̈sningar. Arbetet bestod huvudsakligen av litteraturstudier samt utva ̈rderingar av tv ̊a av Fo ̈rsvarsmakten utvalda produkter: NetIQ Security Manager och Splunk. Slutsatsen blev att ingen av de tv ̊a produkterna uppfyller Fo ̈rsvarsmaktens samtliga krav fo ̈r central logghantering. Personligen anser jag att Fo ̈rsvarsmaktens kravspecifikation fo ̈r central logg- hantering a ̈r fo ̈r strikt och bo ̈r omarbetas. Ett antal krav i den nuvarande specifikationen kan med fo ̈rdel tas bort. Andra krav bo ̈r omformuleras och/eller omva ̈rderas.
APA, Harvard, Vancouver, ISO, and other styles
2

Vargues, Ângela Cristina Matias Correia. "Da ideia ao projecto - uma abordagem à arte contemporânea em EVT." Master's thesis, Universidade de Aveiro, 2011. http://hdl.handle.net/10773/6343.

Full text
Abstract:
Mestrado em Criação Artística e Contemporânea
As sucessivas transformações que caraterizam a atualidade propõem novas configurações, onde o sistema educativo desempenha um dos mais importantes papéis, procurando dar resposta às necessidades que vão surgindo ao longo dos tempos. A procura de novas práticas e metodologias é uma constante, tentando acompanhar a quantidade de informação e a facilidade de acesso ao conhecimento. A diversidade de recursos e o cruzamento de várias disciplinas apresentam-se como componentes deste processo, a que designamos contemporâneo. Este estudo coloca a importância da Educação Artística através de uma abordagem à arte contemporânea, na disciplina de Educação Visual e Tecnológica. Foi elaborado através do desenvolvimento de um projeto, organizado em três Momentos, que visa aproximar diferentes linguagens. Exploram-se novas possibilidades a utilizar em contexto educativo, promovendo uma aprendizagem significativa, em que os alunos resolvem na prática o seu processo de descoberta. É uma proposta que pretende ressituar a exploração da disciplina no contexto atual. O Meio surge como o dispositivo para desenvolver olhares diferentes a partir do habitual, em que se valoriza o processo de experimentação para desenvolver nos alunos o seu sentido estético e artístico.
The successive transformations that characterize the current days propose new patterns, where the education system plays a major role, seeking to give an answer to the needs that arise over time. The search for new methodologies and practices is relentless and tries to follow to the amount of information and the ease access to knowledge. The diversity of resources and the meeting of numerous subjects are components of this process, which is called contemporary. This study raises the importance of Arts Education through an approach to contemporary art in the school subject of Visual and Technological Education. It was prepared in a three-moment project, which aims to bring together different languages. It explores new possibilities to develop in an educational context that encourages significant learning in which students give answers to their on-going discovery process. It is a proposal that intends to resituate the exploration of the subject Visual and Technological Education in the current context. The Environment rises as a device that, from the usual, develops different looks, in which the experimentation process is central to grow students artistic and aesthetic sense.
APA, Harvard, Vancouver, ISO, and other styles
3

McEwan, Peter Gareth Fredric. "The GARCH-EVT-Copula model and simulation in scenario-based asset allocation." Thesis, Nelson Mandela Metropolitan University, 2016. http://hdl.handle.net/10948/11732.

Full text
Abstract:
Financial market integration, in particular, portfolio allocations from advanced economies to South African markets, continues to strengthen volatility linkages and quicken volatility transmissions between participating markets. Largely as a result, South African portfolios are net recipients of returns and volatility shocks emanating from major world markets. In light of these, and other, sources of risk, this dissertation proposes a methodology to improve risk management systems in funds by building a contemporary asset allocation framework that offers practitioners an opportunity to explicitly model combinations of hypothesised global risks and the effects on their investments. The framework models portfolio return variables and their key risk driver variables separately and then joins them to model their combined dependence structure. The separate modelling of univariate and multivariate (MV) components admits the benefit of capturing the data generating processes with improved accuracy. Univariate variables were modelled using ARMA-GARCH-family structures paired with a variety of skewed and leptokurtic conditional distributions. Model residuals were fit using the Peaks-over-Threshold method from Extreme Value Theory for the tails and a non-parametric, kernel density for the interior, forming a completed semi-parametric distribution (SPD) for each variable. Asset and risk factor returns were then combined and their dependence structure jointly modelled with a MV Student t copula. Finally, the SPD margins and Student t copula were used to construct a MV meta t distribution. Monte Carlo simulations were generated from the fitted MV meta t distribution on which an out-of-sample test was conducted. The 2014-to-2015 horizon served to proxy as an out-of-sample, forward-looking scenario for a set of key risk factors against which a hypothetical, diversified portfolio was optimised. Traditional mean-variance and contemporary mean-CVaR optimisation techniques were used and their results compared. As an addendum, performance over the in-sample 2008 financial crisis was reported. The final Objective (7) addressed management and conservation strategies for the NMBM. The NMBM wetland database that was produced during this research is currently being used by the Municipality and will be added to the latest National Wetland Map. From the database, and tools developed in this research, approximately 90 wetlands have been identified as being highly vulnerable due to anthropogenic and environmental factors (Chapter 6) and should be earmarked as key conservation priority areas. Based on field experience and data collected, this study has also made conservation and rehabilitation recommendations for eight locations. Recommendations are also provided for six more wetland systems (or regions) that should be prioritised for further research, as these systems lack fundamental information on where the threat of anthropogenic activities affecting them is greatest. This study has made a significant contribution to understanding the underlying geomorphological processes in depressions, seeps and wetland flats. The desktop mapping component of this study illustrated the dominance of wetlands in the wetter parts of the Municipality. Perched wetland systems were identified in the field, on shallow bedrock, calcrete or clay. The prevalence of these perches in depressions, seeps and wetland flats also highlighted the importance of rainfall in driving wetland formation, by allowing water to pool on these perches, in the NMBM. These perches are likely to be a key factor in the high number of small, ephemeral wetlands that were observed in the study area, compared to other semi-arid regions. Therefore, this research highlights the value of multi-faceted and multi-scalar wetland research and how similar approaches should be used in future research methods has been highlighted. The approach used, along with the tools/methods developed in this study have facilitated the establishment of priority areas for conservation and management within the NMBM. Furthermore, the research approach has revealed emergent wetland properties that are only apparent when looking at different spatial scales. This research has highlighted the complex biological and geomorphological interactions between wetlands that operate over various spatial and temporal scales. As such, wetland management should occur across a wetland complex, rather than individual sites, to account for these multi-scalar influences.
APA, Harvard, Vancouver, ISO, and other styles
4

Lindholm, Dennis. "On Value-at-Risk and the more extreme : A study on quantitative market risk measurements." Thesis, Uppsala universitet, Statistiska institutionen, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-256173.

Full text
Abstract:
Inline with the third pillar of the Basel accords, quantitative market risk measurements are investigate and evaluated comparing JP Morgan’s RiskMetrics and Bollerslev’s GARCH with the Peek over Threshold and Block Maxima approaches from the Extreme Value Theory framework. Value-at-Risk and Expected Shortfall (Conditional Value-at-Risk), with 95% and 99% confidence, is predicted for 25 years of the OMXS30. The study finds Bollerslev’s suggested t distribution to be a more appropriate distributional assumption, but no evidence to prefer the GARCH to the RiskMetrics. The more demanding Extreme Value Theory procedures trail behind as they are found wasteful of data and more difficult to backtest and therefore evaluate.
APA, Harvard, Vancouver, ISO, and other styles
5

Berning, Thomas Louw. "Improved estimation procedures for a positive extreme value index." Thesis, Stellenbosch : University of Stellenbosch, 2010. http://hdl.handle.net/10019.1/5260.

Full text
Abstract:
Thesis (PhD (Statistics))--University of Stellenbosch, 2010.
ENGLISH ABSTRACT: In extreme value theory (EVT) the emphasis is on extreme (very small or very large) observations. The crucial parameter when making inferences about extreme quantiles, is called the extreme value index (EVI). This thesis concentrates on only the right tail of the underlying distribution (extremely large observations), and specifically situations where the EVI is assumed to be positive. A positive EVI indicates that the underlying distribution of the data has a heavy right tail, as is the case with, for example, insurance claims data. There are numerous areas of application of EVT, since there are a vast number of situations in which one would be interested in predicting extreme events accurately. Accurate prediction requires accurate estimation of the EVI, which has received ample attention in the literature from a theoretical as well as practical point of view. Countless estimators of the EVI exist in the literature, but the practitioner has little information on how these estimators compare. An extensive simulation study was designed and conducted to compare the performance of a wide range of estimators, over a wide range of sample sizes and distributions. A new procedure for the estimation of a positive EVI was developed, based on fitting the perturbed Pareto distribution (PPD) to observations above a threshold, using Bayesian methodology. Attention was also given to the development of a threshold selection technique. One of the major contributions of this thesis is a measure which quantifies the stability (or rather instability) of estimates across a range of thresholds. This measure can be used to objectively obtain the range of thresholds over which the estimates are most stable. It is this measure which is used for the purpose of threshold selection for the proposed PPD estimator. A case study of five insurance claims data sets illustrates how data sets can be analyzed in practice. It is shown to what extent discretion can/should be applied, as well as how different estimators can be used in a complementary fashion to give more insight into the nature of the data and the extreme tail of the underlying distribution. The analysis is carried out from the point of raw data, to the construction of tables which can be used directly to gauge the risk of the insurance portfolio over a given time frame.
AFRIKAANSE OPSOMMING: Die veld van ekstreemwaardeteorie (EVT) is bemoeid met ekstreme (baie klein of baie groot) waarnemings. Die parameter wat deurslaggewend is wanneer inferensies aangaande ekstreme kwantiele ter sprake is, is die sogenaamde ekstreemwaarde-indeks (EVI). Hierdie verhandeling konsentreer op slegs die regterstert van die onderliggende verdeling (baie groot waarnemings), en meer spesifiek, op situasies waar aanvaar word dat die EVI positief is. ’n Positiewe EVI dui aan dat die onderliggende verdeling ’n swaar regterstert het, wat byvoorbeeld die geval is by versekeringseis data. Daar is verskeie velde waar EVT toegepas word, aangesien daar ’n groot aantal situasies is waarin mens sou belangstel om ekstreme gebeurtenisse akkuraat te voorspel. Akkurate voorspelling vereis die akkurate beraming van die EVI, wat reeds ruim aandag in die literatuur geniet het, uit beide teoretiese en praktiese oogpunte. ’n Groot aantal beramers van die EVI bestaan in die literatuur, maar enige persoon wat die toepassing van EVT in die praktyk beoog, het min inligting oor hoe hierdie beramers met mekaar vergelyk. ’n Uitgebreide simulasiestudie is ontwerp en uitgevoer om die akkuraatheid van beraming van ’n groot verskeidenheid van beramers in die literatuur te vergelyk. Die studie sluit ’n groot verskeidenheid van steekproefgroottes en onderliggende verdelings in. ’n Nuwe prosedure vir die beraming van ’n positiewe EVI is ontwikkel, gebaseer op die passing van die gesteurde Pareto verdeling (PPD) aan waarnemings wat ’n gegewe drempel oorskrei, deur van Bayes tegnieke gebruik te maak. Aandag is ook geskenk aan die ontwikkeling van ’n drempelseleksiemetode. Een van die hoofbydraes van hierdie verhandeling is ’n maatstaf wat die stabiliteit (of eerder onstabiliteit) van beramings oor verskeie drempels kwantifiseer. Hierdie maatstaf bied ’n objektiewe manier om ’n gebied (versameling van drempelwaardes) te verkry waaroor die beramings die stabielste is. Dit is hierdie maatstaf wat gebruik word om drempelseleksie te doen in die geval van die PPD beramer. ’n Gevallestudie van vyf stelle data van versekeringseise demonstreer hoe data in die praktyk geanaliseer kan word. Daar word getoon tot watter mate diskresie toegepas kan/moet word, asook hoe verskillende beramers op ’n komplementêre wyse ingespan kan word om meer insig te verkry met betrekking tot die aard van die data en die stert van die onderliggende verdeling. Die analise word uitgevoer vanaf die punt waar slegs rou data beskikbaar is, tot op die punt waar tabelle saamgestel is wat direk gebruik kan word om die risiko van die versekeringsportefeulje te bepaal oor ’n gegewe periode.
APA, Harvard, Vancouver, ISO, and other styles
6

Bramstång, Philip, and Richard Hermanson. "Extreme value theory with Markov chain Monte Carlo - an automated process for EVT in finance." Thesis, KTH, Matematisk statistik, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-172970.

Full text
Abstract:
The purpose of this thesis was to create an automated procedure for estimating financial risk using extreme value theory (EVT). The "peaks over threshold" (POT) result from EVT was chosen for modelling the tails of the distribution of financial returns. The main difficulty with POT is choosing a convergence threshold above which the data points are regarded as extreme events and modelled using a limit distribution. It was investigated how risk measures are affected by variations in this threshold and it was deemed that fixed-threshold models are inadequate in the context of few relevant data points, as is often the case in EVT applications. A model for automatic threshold weighting was proposed and shows promise. Moreover, the choice of Bayesian vs frequentist inference, with focus on Markov chain Monte Carlo (MCMC) vs maximum likelihood estimation (MLE), was investigated with regards to EVT applications, favoring Bayesian inference and MCMC. Two MCMC algorithms, independence Metropolis (IM) and automated factor slice sampler (AFSS), were analyzed and improved in order to increase performance of the final procedure. Lastly, the effects of a reference prior and a prior based on expert opinion were compared and exemplified for practical applications in finance.
Syftet med detta examensarbete var att utveckla en automatisk process för uppskattning av finansiell risk med hjälp av extremvärdesteori. "Peaks over threshold" (POT) valdes som metod för att modellera extrempunkter i avkastningsdata. Den stora svårigheten med POT är att välja ett tröskelvärde för konvergens, över vilket alla datapunkter betraktas som extrema och modelleras med en gränsvärdesdistribution. Detta tröskelvärdes påverkan på olika riskmått undersöktes, med slutsatsen att modeller med fast tröskelvärde är olämpliga om datamängden är liten, vilket ofta är fallet i tillämpade extremvärdesmetoder.En modell för viktning av tröskelvärden presenterades och uppvisade lovande resultat. Därtill undersöktes valet mellan Bayesiansk och frekventisk inferens, med fokus på skillnaden mellan Markov chain Monte Carlo (MCMC) och maximum likelihood estimation (MLE), när det kommer till applicerad extremvärdesteori. Bayesiansk inferens och MCMC bedömdes vara bättre, och två MCMC-algoritmer; independence Metropolis (IM) och automated factor slice sampler (AFSS), analyserades och förbättrades för använding i den automatiska processen. Avslutningsvis jämfördes effekterna av olika apriori sannolikhetsfördelningar (priors) på processens slutresultat. En svagt informativ referensprior jämfördes med en starkt informativ prior baserad på expertutlåtanden.
APA, Harvard, Vancouver, ISO, and other styles
7

Ramalho, Diogo Ricardo Vieira. "Predictive performance of value-at-risk models: Covid-19 “Pandemonium”." Master's thesis, Instituto Superior de Economia e Gestão, 2020. http://hdl.handle.net/10400.5/20949.

Full text
Abstract:
Mestrado em Mathematical Finance
Atualmente, os modelos Value-at-Risk (VaR), têm um papel muito importante a nível dos Mercados Financeiros, sendo uma das ferramentas mais utilizadas, por analistas financeiros, para gestão e estimação de risco de mercado. Nesta tese, três métodos de estimação de VaR, nomeadamente o método de Simulação Histórica, GARCH(1,1) e o método EVT-POT Dinâmico, foram aplicados. O propósito deste trabalho é estimar modelos VaR para os países: EUA, França, Alemanha, Itália, Japão, Reino Unido, China, Espanha e Portugal, com um intervalo de tempo desde 1 de Janeiro de 2007 até 31 de Agosto de 2020 e um nível de confiança de 99%. Estas estimações serão então testadas por via Backtest, permitindo identificar quando ocorreram a maioria das falhas, e se estas ocorreram em períodos normais ou de crise (por exemplo, a Pandemia COVID-19). Adicionalmente, é estudado se existe alguma relação entre o número de mortos por país e o movimento dos retornos e da volatilidade dos índices de stocks. O modelo que mostrou ter maior precisão aquando da estimação de períodos de crise foi o EVT-POT dinâmico, sendo HS o modelo menos preciso. É possível observar que a maioria das falhas, causadas por observações incomuns, ocorreram durante os anos 2008, 2011, 2013, 2018 e 2020, que são considerados períodos de crise. Foi também possível concluir que o movimento dos índices de stocks é influenciado pelo aumento do número de mortes por COVID-19, mostrando assim que existe uma relação entre ambos (quando o número de mortes aumenta, os mercados tornam-se mais voláteis).
Nowadays, Value-at-Risk (VaR) models play a crucial role in Financial Markets, being one of the most widely risk management tools used by financial analysts, to estimate market risk. In this thesis, three widely used approaches to estimate VaR, namely Historical Simulation, GARCH(1,1) and Dynamic EVT-POT, were applied. We will estimate VaR models for the countries: USA, UK, France, Germany, Italy, Japan, China, Spain and Portugal with a time horizon from 1st of January of 2007 to 31st of August 2020. It was chosen a confidence level of 99%. These estimations will then be backtested, enabling a conclusion of when the majority of the exceedances happen in a "normal" period or in a crisis period (e.g. COVID-19 Pandemic). Further, it is studied if there is any relation between the mortality number in each country and the movement in returns or volatility of stock indices. The model that showed to be the most accurate when estimating crisis periods is Dynamic EVT-POT model. The model that showed less accuracy is the HS. It is possible to see that most of the exceedances, caused by outlier observations, occur during years 2008, 2011, 2013, 2018 and 2020 which are years known to be crisis periods. It was also possible to conclude that the movement in the stock indices is influenced with the increase in COVID-19 related deaths, showing therefore that there is some sort of relation between the two phenomena (when the number of deaths increase, the markets are more volatile).
info:eu-repo/semantics/publishedVersion
APA, Harvard, Vancouver, ISO, and other styles
8

Wang, Jo-Yu. "Portfolio based VaR model : a combination of extreme value theory (EVT) and dynamic conditional correlation (DCC) model." Thesis, University of Southampton, 2013. https://eprints.soton.ac.uk/348328/.

Full text
Abstract:
This thesis fills a gap in the risk management literature and expands the understanding of the portfolio value at risk (VaR) by providing a theoretical market risk measurement of a portfolio (called “GEV-DCC model”), which combines the tail dynamic conditional correlation (tail-DCC) and extreme value theory. According to the spirit of VaR, the tail distribution is more important than the entire distribution, as well as the correlation in the tail area between various assets. The main advantage of this approach is the increase of accuracy in the parameter estimation of the tail distribution and more consistent correlation measurement for VaR. The results from this method are compared with four other conventional VaR approaches; GARCH model, RiskMetrics, stochastic volatility, and historical simulation. Furthermore, three quality measures are applied to evaluate the suitability, conservativeness, and magnitude of loss of the forecasted VaR, which offer more information from the forecasted VaR pattern. Applying 16 major equity index returns from developed and emerging markets, this study finds that the GEV-DCC model offers a more accurate coverage across the blocks in the three hypothetical portfolios (the developed equity markets, Asian and Latin American equity markets) compared with the four competing models. The uncovered rates of the GEV-DCC model with the 5-day block approach are generally close to the given probability (α) set in the VaR calculation. These consistent results can also be found in the robustness test with the shorter forecasting period. In the quality checks, the GEV-DCC presents a relatively stable pattern in the daily and 10-day VaR results. In addition, the GEV-DCC model also provides satisfactory results in the conservativeness and potential loss tests although no direct evidence indicates that it delivers the best result in these two checks. We also find significant differences between the original DCC and the tail-DCC. This evidence shows that the correlations between equity markets in the left tail are significantly higher than the ones in the right tail, and there are significant changes (generally rising) in the tail-DCC patterns around the period of financial crisis in the third quarter of 2008. The results from this study could potentially provide a critical reference for investors in measuring or managing the market risk.
APA, Harvard, Vancouver, ISO, and other styles
9

Katariya, Ashish Santosh. "Dynamic modeling and feedback control with mode-shifting of a two-mode electrically variable transmission." Thesis, Georgia Institute of Technology, 2012. http://hdl.handle.net/1853/45825.

Full text
Abstract:
This thesis develops dynamic models for the two-mode FWD EVT, develops a control system based on those models that is capable of meeting driver torque demands and performing synchronous mode shifts between different EVT modes while also accommodating preferred engine operating points. The two-input two-output transmission controller proposed herein incorporates motor-generator dynamics, is based on a general state-space integral control structure, and has feedback gains determined using linear quadratic regulator (LQR) optimization. Dynamic modeling of the vehicle is categorized as dynamic modeling of the mechanical and electrical subsystems where the mechanical subsystem consists of the planetary gear sets, the transmission and the engine whereas the electrical subsystem consists of the motor-generator units and the battery pack. A discussion of load torque is also considered as part of the mechanical subsystem. With the help of these derived dynamic models, a distinction is made between dynamic output torque and steady-state output torque. The overall control system consisting of multiple subsystems such as the human driver, power management unit (PMU), friction brakes, combustion engine, transmission control unit (TCU) and motor-generator units is designed. The logic for synchronous mode shifts between different EVT modes is also detailed as part of the control system design. Finally, the thesis presents results for responses in individual operating modes, EVT mode shifting and a full UDDS drive cycle simulation.
APA, Harvard, Vancouver, ISO, and other styles
10

Martins, Tomás. "Concepção de uma comunidade de prática online : um estudo em torno da integração das TIC na disciplina de EVT." Master's thesis, Universidade de Aveiro, 2007. http://hdl.handle.net/10773/1292.

Full text
Abstract:
Mestrado em Multimédia em Educação
Alguns estudos indicam que as TIC (Tecnologias da Informação eComunicação) ainda não são efectivamente utilizadas nos processos deensino e aprendizagem, e quando o são, o seu uso tem muitas vezessubjacente a perspectivas tradicionais de ensino. Muitos destes trabalhos sãogerais, pelo que se reconhece a necessidade da realização de estudos quepermitam conhecer realidades específicas. Considerando que o professor assume um papel fundamental na desejadamudança da escola, deve olhar-se a formação dos professores como um processo indissociável do seu próprio desenvolvimento pessoal, conciliando asnecessidades profissionais e os seus interesses pessoais. Uma possibilidade é promover essa formação no seio de CoP (Comunidades de Prática). Não havendo ao nosso conhecimento, estudos sobre as práticas de integraçãodas TIC na disciplina de EVT (Educação Visual e Tecnológica), nem que fundamentem a concepção de uma CoP (Comunidade de Prática) deprofessores de EVT, com o presente estudo, pretende-se: i) conhecer as práticas e atitudes dos professores de EVT no que concerne à integração dasTIC nas suas aulas; ii) colher informações que permitam definir as condições necessárias à emergência de uma CoP online, onde os seus membros possam desenvolver competências profissionais através da partilha e da construçãoconjunta de conhecimento. Com estes objectivos em mente, planeámos eimplementámos um estudo exploratório-descritivo, pois pretendia-se conhecer as aptidões dos professores inquiridos para integrarem uma CoP onlinee descrever a realidade actual relativamente ao uso das TIC. Na fase empíricaforam utilizados dois instrumentos de recolha de dados. Num primeiro momento, recorreu-se a um inquérito por questionário, aplicado aosprofessores que leccionam EVT nas escolas pertencentes aos concelhos deAlbergaria-a-Velha, Aveiro, Estarreja, Ílhavo e Vagos. Concluído estelevantamento inicial, procedeu-se à preparação e concretização de entrevistas em grupos de enfoque, com o propósito de se explorarem algumas questõesque emergiram da análise feita aos dados obtidos através do questionárioinicial e recolher informações de suporte à concepção de uma CoP online. Os resultados obtidos vão ao encontro de grande parte das conclusões deoutros estudos de maior amplitude e de carácter geral. Os dados evidenciamuma baixa utilização das TIC em interacção directa com os alunos, mas umagrande utilização para fins administrativos, gestão pedagógica e para fins pessoais. Um dos produtos do estudo concretizou-se na elaboração de um “Dossier de concepção de uma CoP online, de professores de EVT”. A partir dos dados colhidos e das indicações da bibliografia consultada, foi possível definir algumas condições consideradas potenciadoras da emergência de umaCoP online, centrada na problemática da integração das TIC na disciplina deEVT. ABSTRACT: Some researches point out that Information Technology isn’t being effectivelyapplied in the teaching and learning process and when that happens it is usedin a traditional perspective of teaching. Many of those works remain general and thereforethere’s a need to develop studies that acknowledge specificrealities. Baring in mind that the teacher plays a fundamental role in the so desiredschool change, people should regard teachers’ vocational training as an intrinsic process to the individual development, associating their professionalneeds with their personal interests. One of the possibilities is promoting that training within the CoP (Communities of Practice). As we aren’t acquainted with researches on strategies that apply InformationTechnology practices to EVT (Educação Visual e Tecnológica), or researches on grounds to conceive a CoP (Community of Practice) with EVT teachers, thisthesis aims to: acknowledge EVT teacher’s points of view as far as the use of Information Technology in their classes is concerned. On the other hand this work also intends to acquire data that allow us define the required conditions to create an online CoP, where its members may develop professional skills by sharing information and building knowledge together. In order to reach our purposes, we planned and put in practise a research thatwas not only descriptive but also analytic because we wanted to know theinterviewed teachers’ proficiencies to take part in an online CoP and describe the present situation about the use of Information Technology in class. In a first phase two instruments were used to collect data: a survey andinterviews. The survey had a questionnaire, which was submittedto EVT teachers in schools situated in the areas of Albergaria-a-Velha, Aveiro, Estarreja, Ílhavo and Vagos. After the survey, we prepared and carried out the interviews, which had twomain purposes: enlighten and clarify some issues that emerged from theanalysis of the data included in the surveys and gather information will justifyand support the creation of an online CoP. The conclusions obtained from this work are very similar to those of the otherresearches that had a wider and more general outlook. The conclusions show that teachers don’t use Information Technology to interact directly with thestudents, but they use it for other purposes: administrative ends, pedagogicalmanagement and personal interests. This work also includes a file named “Dossier de concepção de uma CoP online, de professores de EVT”. From the gathered information and from some suggestions given by the bibliography, it was possible to determine someconditions that show the necessity to set off an online CoP focusing on the useof Information Technology in the EVT class.
APA, Harvard, Vancouver, ISO, and other styles
More sources

Books on the topic "EVT"

1

Leven in emotionele vrijheid: Emotionele Vrijheid Technieken (EVT) praktisch toegepast. Deventer: Ankh-Hermes, 2004.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
2

Meeting, European Association for Animal Production. 40th Annual Meeting of the EAAP =: 40eme ReunionAnnuelle de la FEZ = 40. Jahrestagung der EVT. Roma: EAAP, 1989.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
3

Simha, Yolaine. Eva comme eve en ville. Paris: Tierce, 1985.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
4

Cetin, Anton. Cetín: Varijacije Eva i ptica = Eve and the bird variations. Zagreb: CC Marketing, 1998.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
5

Tugomir, Lukšić, and Peterson Peter, eds. Cetín: Varijacije Eva i ptica = Eve and the bird variations. Zagreb: Meditor, 1996.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
6

Airik-Priuhka, Silvia. Est! Est! Est! Tallinn: Õllu, 1998.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
7

Sykes, Bryan. Bảy nàng con gái của Eva =: The seven daughters of Eve. Thành phố Hồ Chí Minh: NXB Trẻ, 2008.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
8

Gharagyozyan, Donara. Eva, Eva ... Eva: Patmvatskʻner. Erevan: "Nairi", 1991.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
9

Prosperi, Carola. Eva contro Eva. Palermo: Sellerio, 2002.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
10

Angela Shelf Medearis. Eat, babies, eat! Cambridge, Mass: Candlewick Press, 1995.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
More sources

Book chapters on the topic "EVT"

1

Charman, Tony, Susan Hepburn, Moira Lewis, Moira Lewis, Amanda Steiner, Sally J. Rogers, Annemarie Elburg, et al. "EVT-2." In Encyclopedia of Autism Spectrum Disorders, 1178. New York, NY: Springer New York, 2013. http://dx.doi.org/10.1007/978-1-4419-1698-3_100559.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Edgerton, Michael Edward. "The Extra-Normal Voice: EVT in Singing." In Teaching Singing in the 21st Century, 109–32. Dordrecht: Springer Netherlands, 2014. http://dx.doi.org/10.1007/978-94-017-8851-9_8.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

Ganczarek-Gamrot, Alicja, Dominik Krężołek, and Grażyna Trzpiot. "Using EVT to Assess Risk on Energy Market." In Data Analysis and Rationality in a Complex World, 57–64. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-60104-1_7.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Rasmussen, Mikkel. "Value-At-Risk (Var) And Extreme Value Theory (Evt)." In Quantitative Portfolio Optimisation, Asset Allocation and Risk Management, 392–431. London: Palgrave Macmillan UK, 2003. http://dx.doi.org/10.1057/9780230512856_16.

Full text
APA, Harvard, Vancouver, ISO, and other styles
5

Jacob, Maria, Cláudia Neves, and Danica Vukadinović Greetham. "Extreme Value Theory." In Forecasting and Assessing Risk of Individual Electricity Peaks, 39–60. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-28669-9_3.

Full text
Abstract:
Abstract From travel disruptions to natural disasters, extreme events have long captured the public’s imagination and attention. Due to their rarity and often associated calamity, they make waves in the news (Fig. 3.1) and stir discussion in the public realm: is it a freak event? Events of this sort may be shrouded in mystery for the general public, but a particular branch of probability theory, notably Extreme Value Theory (EVT), offers insight to their inherent scarcity and stark magnitude. EVT is a wonderfully rich and versatile theory which has already been adopted by a wide variety of disciplines in a plentiful way. From its humble beginnings in reliability engineering and hydrology, it has now expanded much further; it can be used to model the occurrences of records (say for example in athletic events) or quantify the probability of floods with magnitude greater than what has been observed in the past, i.e it allows us extrapolate beyond the range of available data!
APA, Harvard, Vancouver, ISO, and other styles
6

Alves, M. I. Fraga, and P. Araújo Santos. "Conditional EVT for VAR Estimation: Comparison with a New Independence Test." In Advances in Regression, Survival Analysis, Extreme Values, Markov Processes and Other Statistical Applications, 183–91. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-34904-1_19.

Full text
APA, Harvard, Vancouver, ISO, and other styles
7

Boulier, Jean-François. "EVT Seen by a Vet: A Practitioner's Experience on Extreme Value Theory." In Extreme Events in Finance, 525–28. Hoboken, New Jersey: John Wiley & Sons, Inc., 2016. http://dx.doi.org/10.1002/9781118650318.ch21.

Full text
APA, Harvard, Vancouver, ISO, and other styles
8

Berger, Theo. "Financial Crisis, VaR Forecasts and the Performance of Time Varying EVT-Copulas." In Operations Research Proceedings, 35–40. Cham: Springer International Publishing, 2013. http://dx.doi.org/10.1007/978-3-319-00795-3_6.

Full text
APA, Harvard, Vancouver, ISO, and other styles
9

Wang, Zongrun, Yanbo Jin, and Yanju Zhou. "Estimating Portfolio Risk Using GARCH-EVT-Copula Model: An Empirical Study on Exchange Rate Market." In Lecture Notes in Electrical Engineering, 65–72. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-12990-2_8.

Full text
APA, Harvard, Vancouver, ISO, and other styles
10

Jiang, Feifan, and Yucan Liu. "The analysis of inter-industry VaR on China stock markets–based on the GARCH-EVT-copula model." In Economic and Business Management, 61–65. London: CRC Press, 2022. http://dx.doi.org/10.1201/9781003203704-12.

Full text
APA, Harvard, Vancouver, ISO, and other styles

Conference papers on the topic "EVT"

1

Cantemir, Codrin-Gruie, Gabriel Ursescu, Lorenzo Serrao, Giorgio Rizzoni, James Bechtel, Thomas Udvare, and Michael Letherwood. "Island Concept EVT." In Powertrain & Fluid Systems Conference and Exhibition. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2006. http://dx.doi.org/10.4271/2006-01-3260.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Wenyan Li, Cuijuan Hao, Lijun Qin, Qing Guo, and Meng Li. "Research of time synchronization in ECT/EVT of intelligent substation IEEE1588-based." In 2011 IEEE Power Engineering and Automation Conference (PEAM). IEEE, 2011. http://dx.doi.org/10.1109/peam.2011.6134973.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

Shumei Cui, Miao Yu, Wenxiang Huang, Yuan Cheng, and Qianfan Zhang. "Research on the decoupling of EVT." In 2009 IEEE Vehicle Power and Propulsion Conference (VPPC). IEEE, 2009. http://dx.doi.org/10.1109/vppc.2009.5289623.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Dong, Jian, Zuomin Dong, and Curran Crawford. "Review of Continuously Variable Transmission Powertrain System for Hybrid Electric Vehicles." In ASME 2011 International Mechanical Engineering Congress and Exposition. ASMEDC, 2011. http://dx.doi.org/10.1115/imece2011-63321.

Full text
Abstract:
In this paper, a review of the state-of-the-art of various CVT powertrain systems now used or being planned for future use in HEVs is presented. These CVT powertrain systems are classified into three main categories: mechanical CVT, electromechanical CVT (ECVT) and pure electrical CVT (EVT). The research development, system architecture, operation characteristics and the merits and drawbacks of each type are discussed.
APA, Harvard, Vancouver, ISO, and other styles
5

Larson, Jordan, and Demoz Gebre-Egziabher. "Constructing EVT-based confidence bounds using bootstrapping." In 2017 IEEE Aerospace Conference. IEEE, 2017. http://dx.doi.org/10.1109/aero.2017.7943856.

Full text
APA, Harvard, Vancouver, ISO, and other styles
6

Li, Feng, and Qizhe Quan. "Study of Financial Risk Based on EVT." In 2009 Ninth International Conference on Hybrid Intelligent Systems. IEEE, 2009. http://dx.doi.org/10.1109/his.2009.249.

Full text
APA, Harvard, Vancouver, ISO, and other styles
7

Sendino, O., A. Fernandez-Simon, D. Busquets, A. Zebenzuy, J. García-Lledó, J. Tejedor-Tejada, E. Rodríguez de Santiago, et al. "ENDOSCOPIC VACUUM THERAPY (EVT) FOR THE CLOSURE OF UPPER GASTROINTESTINAL DEFECTS: PRELIMINARY RESULTS FROM THE SPANISH EVT REGISTRY." In ESGE Days 2022. Georg Thieme Verlag KG, 2022. http://dx.doi.org/10.1055/s-0042-1744837.

Full text
APA, Harvard, Vancouver, ISO, and other styles
8

Collins, Shamara, Imran Khan, Vamsi Evani, Chih An Hsu, Vasilios Palekis, Don Morel, and Chris Ferekides. "PL Study of Phosphorus-Doped CdTe EVT Films." In 2017 IEEE 44th Photovoltaic Specialists Conference (PVSC). IEEE, 2017. http://dx.doi.org/10.1109/pvsc.2017.8366034.

Full text
APA, Harvard, Vancouver, ISO, and other styles
9

Haughery, John R., Brian L. Steward, Saxon J. Ryan, and R. Gallolu Kankanamalage. "Modeling Hybrid Hydro-Electro-Mechanical Power-Split Propulsion Systems." In ASME/BATH 2021 Symposium on Fluid Power and Motion Control. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/fpmc2021-69056.

Full text
Abstract:
Abstract Hydrostatic and hydro-mechanical transmissions (HSTs and HMTs, respectively) are commonly used in off-highway vehicles. While both transmission technologies can provide continuously variable torque or speed ratios, they suffer from poor efficiencies and limited operating ranges. Electric variable transmissions (EVTs), in contrast, offer complementary strengths via higher efficiencies at low forward and reverse speeds, full torque from zero to full power, and increased control capabilities. While HST, HMT, and EVT powertrain architectures are not novel, the authors are not aware of work integrating these technologies into hydro-electro-mechanical (HEMT) transmission architectures. Thus, this research aimed to develop a physical modeling methodology to explore different power-split transmission technologies using hydraulic, electrical, and mechanical pathways to understand how the complementary nature of the technologies could be used for overall power transmission performance. Steady-state modeling was performed using the Modelica® (Modelica Association) modeling language in the Dymola (Dassault Systems®) integrated development environment. Overall efficiency vs. output speed was presented for HMT, EMT, and HEMT input-coupled architectures, including circulating power considerations. This research extends the state-of-the-art of off-road powertrain technologies by providing the literature an exemplar modeling of HEMT coupling techniques, system integration, and power flow architectures in Modelica® modeling language.
APA, Harvard, Vancouver, ISO, and other styles
10

Hu Bei, Ye Guoxiong, Huang Hua, and Wang Gang. "Research on measurement accuracy of EVT during the surge." In 2014 International Conference on Power System Technology (POWERCON). IEEE, 2014. http://dx.doi.org/10.1109/powercon.2014.6993628.

Full text
APA, Harvard, Vancouver, ISO, and other styles

Reports on the topic "EVT"

1

Wang, Yingxuan, Cheng Yan, and Liqin Zhao. Rapid switching kVp dual energy CT Material Quantitative Determination for Non-invasive Assessment of Portal Hypertensive Esophagus Varices in Patients with Hepatic Cirrhosis: A Systematic Review and Meta-analysis. INPLASY - International Platform of Registered Systematic Review and Meta-analysis Protocols, April 2022. http://dx.doi.org/10.37766/inplasy2022.4.0121.

Full text
Abstract:
Review question / Objective: This meta-analysis investigated the value of rsDECT -based non-invasive assessment of the severity of esophagus varices and the risk of hemorrhage in patients with cirrhotic portal hypertension. Eligibility criteria: Studies meeting the following criteria were included: Studies evaluating the effect of rsDECT on EV in patients with hepatic cirrhosis, and published in Chinese or English; The diagnosis was based on acknowledged gold standard. Containing complete four-grid table data of diagnostic tests, which can be extracted directly or indirectly. Review, case-report, conference summary, animal study, and repeatedly published study were excluded.Based on the severity of EV shown in the endoscopy, patients in the study group were classified into the mild EV (EV1), medium EV (EV2), or severe EV (EV3) groups according to the General Rules for Recording Endoscopic Findings of Esophagogastric varices (The Japan Society for Portal Hypertension) : EV1, slightly linear expansions; EV2, moderately beaded expansions; EV3, significantly nodular or neoplastic expansions.
APA, Harvard, Vancouver, ISO, and other styles
2

Francfort, James E. How Do The EV Project Participants Feel About Their EVS? Office of Scientific and Technical Information (OSTI), February 2015. http://dx.doi.org/10.2172/1183499.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

Haberland, Nicole, and Deborah Rogow. Éducation sexuelle et VIH : il est temps de changer de méthodologie. Population Council, 2007. http://dx.doi.org/10.31899/pgy12.1081.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Gilbert, R. Guide d'excursions dans le paysage glaciaire et postglaciaire du sud-est de l'Ontario et d'une partie du Québec. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1994. http://dx.doi.org/10.4095/194484.

Full text
APA, Harvard, Vancouver, ISO, and other styles
5

Sabina, A. P. Roches et minéraux du collectionneur, nord-est de la Nouvelle-Écosse, Ile du Cap-Breton et Ile-du-Prince-Édouard. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1994. http://dx.doi.org/10.4095/194756.

Full text
APA, Harvard, Vancouver, ISO, and other styles
6

Paradis, S. J., and M. Parent. Géologie des formations en surface, Rivière Koroc (moitié est), Québec-Terre-Neuve-et-Labrador. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2002. http://dx.doi.org/10.4095/213439.

Full text
APA, Harvard, Vancouver, ISO, and other styles
7

Haselbacher, Andreas, Michel Arnal, Maurizio Barbato, Alexander Fuchs, Jared Garrison, Turhan Demiray, Philipp Jenny, et al. Joint synthesis “Electricity storage via adiabatic air compression” of the NRP “Energy”. Swiss National Science Foundation (SNSF), January 2020. http://dx.doi.org/10.46446/publication_nrp70_nrp71.2020.3.en.

Full text
Abstract:
La fermeture des centrales nucléaires et le développement de l’énergie solaire et éolienne rendent la production d’électricité plus volatile. De nouveaux systèmes de stockage sont nécessaires pour s’assurer que l’électricité est disponible au moment où elle est nécessaire. Le stockage adiabatique d’air comprimé représente une technologie prometteuse. Il utilise l’excédent de production des installations solaires et éoliennes pour comprimer l’air ambiant et le stocker dans une cavité souterraine. Au besoin, l’air comprimé est à nouveau détendu et entraîne alors une turbine qui produit de l’électricité. En tirant profit de la chaleur générée lors de la compression, cette technologie atteint un rendement de 65 à 75 %, ce qui est semblable à celui obtenu avec l’accumulation par pompage. En termes de potentiel d’émission de gaz à effet de serre et de dommages aux écosystèmes, la compatibilité environnementale des réservoirs d’air comprimé est également comparable à celle des systèmes à accumulation par pompage. Les réservoirs d’air comprimé sont techniquement réalisables. Les composants importants, comme les turbomachines et les accumulateurs thermiques, sont déjà disponibles sur le marché ou ont été testés dans une installation pilote. La construction de cavités bénéficie de l’expérience acquise lors de la réalisation de tunnels et de cavernes. Les réservoirs adiabatiques d’air comprimé constituent par conséquent une solution de stockage efficace, écologique et techniquement réalisable. En raison de leurs coûts d’investissement élevés et du manque de clarté qui entoure leur cadre économique et juridique, leur rentabilité demeure toutefois incertaine. Cela complique également le financement d’une installation de démonstration.
APA, Harvard, Vancouver, ISO, and other styles
8

Haselbacher, Andreas, Michel Arnal, Maurizio Barbato, Alexander Fuchs, Jared Garrison, Turhan Demiray, Philipp Jenny, et al. Synthèse conjointe «Stockage d’électricité par compression adiabatique d’air» du PNR «Energie». Swiss National Science Foundation (SNSF), January 2020. http://dx.doi.org/10.46446/publication_pnr70_pnr71.2020.3.fr.

Full text
Abstract:
La fermeture des centrales nucléaires et le développement de l’énergie solaire et éolienne rendent la production d’électricité plus volatile. De nouveaux systèmes de stockage sont nécessaires pour s’assurer que l’électricité est disponible au moment où elle est nécessaire. Le stockage adiabatique d’air comprimé représente une technologie prometteuse. Il utilise l’excédent de production des installations solaires et éoliennes pour comprimer l’air ambiant et le stocker dans une cavité souterraine. Au besoin, l’air comprimé est à nouveau détendu et entraîne alors une turbine qui produit de l’électricité. En tirant profit de la chaleur générée lors de la compression, cette technologie atteint un rendement de 65 à 75 %, ce qui est semblable à celui obtenu avec l’accumulation par pompage. En termes de potentiel d’émission de gaz à effet de serre et de dommages aux écosystèmes, la compatibilité environnementale des réservoirs d’air comprimé est également comparable à celle des systèmes à accumulation par pompage. Les réservoirs d’air comprimé sont techniquement réalisables. Les composants importants, comme les turbomachines et les accumulateurs thermiques, sont déjà disponibles sur le marché ou ont été testés dans une installation pilote. La construction de cavités bénéficie de l’expérience acquise lors de la réalisation de tunnels et de cavernes. Les réservoirs adiabatiques d’air comprimé constituent par conséquent une solution de stockage efficace, écologique et techniquement réalisable. En raison de leurs coûts d’investissement élevés et du manque de clarté qui entoure leur cadre économique et juridique, leur rentabilité demeure toutefois incertaine. Cela complique également le financement d’une installation de démonstration.
APA, Harvard, Vancouver, ISO, and other styles
9

NMR Publisering. Ett gott liv i ett hållbart Norden. Nordisk Ministerråd, June 2013. http://dx.doi.org/10.6027/anp2013-725.

Full text
APA, Harvard, Vancouver, ISO, and other styles
10

Charmes, Jacques. Concevoir des enquêtes et analyser les résultats dans une perspective de genre dans la recherche en économie. Institute of Development Studies, November 2022. http://dx.doi.org/10.19088/core.2022.010.

Full text
Abstract:
Ce document fournit des orientations pour l’intégration des considérations de genre et de diversité dans la recherche appliquée en économie portant sur des pays au sein desquels le secteur informel est prépondérant. Il s’inspire du soutien apporté à des centres de recherches d’Afrique de l’Ouest impliqués dans la recherche de solutions aux défis socio-économiques posés par la pandémie de Covid-19 notamment concernant les moyens de subsistance des groupes vulnérables et le secteur informel. Il est rédigé avec l’assistance du CRDI et se veut un guide à la recherche appliquée. Après avoir rappelé dans une première section les principales orientations des analyses de genre, une deuxième section on s’attachera à examiner dans la pratique la manière d’intégrer les considérations de genre et de diversité dans la conception et la formulation des enquêtes statistiques et qualitatives, ainsi que dans leurs analyses descriptives et logistiques. Dans une troisième section, une brève compilation des ressources disponibles sur le genre, l’économie informelle et la pandémie de Covid-19 est présentée.
APA, Harvard, Vancouver, ISO, and other styles
You might also be interested in the extended bibliographies on the topic 'EVT' for particular source types:
Journal articles Dissertations / Theses Books
We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!

To the bibliography