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Letteratura scientifica selezionata sul tema "Svi"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 5 marzo 2023

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Articoli di riviste sul tema "Svi"

Hultman, B., M. Löwén, U. Karlsson, P. H. Li e L. Molina. "Prediction of Activated Sludge Sedimentation Based on Sludge Indices". Water Science and Technology 24, n. 7 (1 ottobre 1991): 33–42. http://dx.doi.org/10.2166/wst.1991.0182.

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Present requirements on nitrogen removal in Sweden make it necessary to increase the sludge concentration in the aeration basin of the activated sludge process. A project has started with the purpose to evaluate the possibilities to use different sludge indices to predict activated sludge sedimentation. Based on literature and experimental studies, it is shown that the diluted sludge volume index (DSVI), the sludge quality index (SQI) and the stirred specific volume index (SSVI3.5) are suitable to predict the sedimentation performance. The traditional sludge volume index (SVI) is not as useful and should therefore be replaced. However, it is possible to recalculate old data on SVI to values of SQI. The SQI value is approximately equal to DSVI and proportional to the SSVI-3.5 value. Pre-precipitation and pre-sedimentation seem to increase the values of the sludge indices.

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Zhao, Bin, Song Zhang e Jian Feng Li. "Evaluation and ANN-Based Prediction on Functional Parameters of Surface Roughness in Precision Grinding of Cast Iron". Advanced Materials Research 1017 (settembre 2014): 166–71. http://dx.doi.org/10.4028/www.scientific.net/amr.1017.166.

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Three-dimensional surface roughness parameters are widely applied to characterize frictional and lubricating properties, corrosion resistance, fatigue strength of surfaces. Among them, the functional parameters of surface roughness, such as Sbi, Sci, and Svi, are used to evaluate bearing and fluid retention properties of surfaces. In this study, the effects of grinding parameters, including wheel linear speed (Vs), workpiece linear speed (Vw), grinding depth (ap), longitudinal feed rate (fa), and dressing rate (F), on functional parameters were studied in grinding of cast iron. An artificial neural network (ANN) model was developed for predicting the functional parameters of three-dimensional surface roughness. The inputs of the ANN models were grinding parameters (Vs, Vw, ap, fa, F), and the output parameters of the models were functional parameters of surface roughness (Sbi, Sci, Svi). With small errors (e.g MSE = 0.09%, 0.61%, and 0.0014%. ), the ANN-based models are considered sufficiently accurate to predict functional parameters of surface roughness in grinding of cast iron.

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Das, R., P. K. Das, S. Bandyopadhyay e U. Raj. "TRENDS AND VULNERABILITY ASSESSMENT OF METEOROLOGICAL AND AGRICULTURAL DROUGHT CONDITIONS OVER INDIAN REGION USING TIME-SERIES (1982–2015) SATELLITE DATA". ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLII-3/W6 (26 luglio 2019): 453–59. http://dx.doi.org/10.5194/isprs-archives-xlii-3-w6-453-2019.

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<p><strong>Abstract.</strong> The vulnerability and trends of meteorological as well as agricultural drought conditions over Indian region was studied using long-term (1982&ndash;2015) gridded precipitation and time-series normalized difference vegetation index (NDVI) data. The Climate Hazards Group Infra-Red Precipitation with Station (CHIRPS) precipitation data (~5&thinsp;km) was used to compute Standardized precipitation index (SPI) at 3-month time scale for Indian summer monsoon season (June-September). Subsequently, the long-term Global Inventory Modelling and Mapping Studies (GIMMS) time-series NDVI data (~8&thinsp;km) was interpolated at daily scale and smoothened using Savitzky and Golay filtering method. Further, the time-series NDVI data was transformed into several phenological parameters using threshold and derivative approach. As integrated NDVI, i.e. the area under seasonal NDVI curve, is able to represent the anomalies in seasonal agricultural production, it was transformed into standardized vegetation index (SVI) using empirical distribution. Several drought parameters, e.g. magnitude and extent, were computed at district level based on the SPI and SVI values, where values with SPI or SVI less than minus one was considered as meteorological and agricultural drought year, respectively. The trends of drought magnitude and extent for both the meteorological and agricultural drought were estimated using Sen’s slope. The direction of trends and magnitude were found to be varying spatially across different parts of Indian region. Further, the mean SPI/SVI values along with drought frequency were utilized to categorize entire Indian agricultural area into different vulnerable zones during three decades separately. The overall drought vulnerability was found to be decreasing over time.</p>

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Martini, Claude, e Arianna Mingone. "No Arbitrage SVI". SIAM Journal on Financial Mathematics 13, n. 1 (marzo 2022): 227–61. http://dx.doi.org/10.1137/20m1351060.

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Bošković, Ivan. "Svi hrvatski dioklecijani". Croatica et Slavica Iadertina, n. 4 (18 gennaio 2017): 401. http://dx.doi.org/10.15291/csi.618.

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Car Dioklecijan nije samo jedno od trajnih mjesta splitske društvene memorije i identiteta, nego i česta tema hrvatske književnosti. Uz mnoštvo tekstova različita žanrovskog predznaka i umjetničke vrijednosti, o tomu svjedoči i iznimno bogata dramska književnost na hrvatskom jeziku, podrobnije opisana u ovomu pregledu. U njoj je splitski car zaogrnut u različito dramsko ruho: scensku igru, dramske slike, radio-igru, cabaret, povijesni spektakl, scensku viziju, tragediju, bajku, satiresku, a pridavane su mu – uz povijesno potvrđene – i različite karakteristike. Osim kao car graditelj i vladar znatnog vladarskog umijeća, najčešće je opisan kao progonitelj i simbol borbe protiv kršćana. Ta je odrednica jedno od referentnih mjesta dramskih tekstova Ogrizovića, Rožića, Kovačevića, Radice, Maroevića i dr. i na njoj je, najčešće, temeljeno dramsko/kazališno iskustvo, više kulturno-povijesnoga a manje estetskoga predznaka, limitirano – izuzev Ogrizovićeva i Šoljanova teksta - skromnom dramskom/kazališnom kulturom i spisateljskim mogućnostima pojedinih autora. Premda je i u carevoj ličnosti, ali i u ličnostima njegovih najbližih bilo motiva poticajnih za dramski razvoj, uglavnom je sve ostalo izvan interesa autora ili je pak mjestimice tek sugerirano. U radu se donosi pregledan p/opis svih drama na hrvatskom jeziku o splitskomu caru.

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Tánczos, Krisztián, Márton Németh, Domonkos Trásy, Ildikó László, Péter Palágyi, Zsolt Szabó, Gabriella Varga e József Kaszaki. "Goal-Directed Resuscitation Aiming Cardiac Index Masks Residual Hypovolemia: An Animal Experiment". BioMed Research International 2015 (2015): 1–8. http://dx.doi.org/10.1155/2015/160979.

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The aim of this study was to compare stroke volume (SVI) to cardiac index (CI) guided resuscitation in a bleeding-resuscitation experiment. Twenty six pigs were randomized and bled in both groups till baseline SVI (Tbsl) dropped by 50% (T0), followed by resuscitation with crystalloid solution until initial SVI or CI was reached (T4). Similar amount of blood was shed but animals received significantly less fluid in the CI-group as in the SVI-group: median = 900 (interquartile range: 850–1780) versus 1965 (1584–2165) mL,p=0.02, respectively. In the SVI-group all variables returned to their baseline values, but in the CI-group animals remained underresuscitated as indicated by SVI, heart rate (HR) and stroke volume variation (SVV), and central venous oxygen saturation (ScvO2) atT4as compared toTbsl: SVI = 23.8 ± 5.9 versus 31.4 ± 4.7 mL, HR: 117 ± 35 versus 89 ± 11/min SVV: 17.4 ± 7.6 versus 11.5 ± 5.3%, andScvO2: 64.1 ± 11.6 versus 79.2 ± 8.1%,p<0.05, respectively. Our results indicate that CI-based goal-directed resuscitation may result in residual hypovolaemia, as bleeding caused stress induced tachycardia “normalizes” CI, without restoring adequate SVI. As the SVI-guided approach normalized most hemodynamic variables, we recommend using SVI instead of CI as the primary goal of resuscitation during acute bleeding.

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Sánchez-Garrido, Natalia, Sara G. Aguilar-Navarro, José Alberto Ávila-Funes, Olga Theou, Melissa Andrew e Mario Ulises Pérez-Zepeda. "The Social Vulnerability Index, Mortality and Disability in Mexican Middle-Aged and Older Adults". Geriatrics 6, n. 1 (8 marzo 2021): 24. http://dx.doi.org/10.3390/geriatrics6010024.

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The social vulnerability index (SVI) independently predicts mortality and others adverse outcomes across different populations. There is no evidence that the SVI can predict adverse outcomes in individuals living in countries with high social vulnerability such as Latin America. The aim of this study was to analyze the association of the SVI with mortality and disability in Mexican middle-aged and older adults. This is a longitudinal study with a follow-up of 47 months, the Mexican Health and Aging Study, including people over the age of 40 years. A SVI was calculated using 42 items stratified in three categories low (<0.36), medium (0.36–0.47), and high (>0.47) vulnerability. We examined the association of SVI with three-year mortality and incident disability. Cox and logistic regression models were fitted to test these associations. We included 14,217 participants (58.4% women) with a mean age of 63.9 years (±SD 10.1). The mean SVI was of 0.42 (±SD 0.12). Mortality rate at three years was 6% (n = 809) and incident disability was 13.2% (n = 1367). SVI was independently associated with mortality, with a HR of 1.4 (95% CI 1.1–1.8, p < 0.001) for the highest category of the SVI compared to the lowest. Regarding disability, the OR was 1.3 (95% CI 1.1–1.5, p = 0.026) when comparing the highest and the lowest levels of the SVI. The SVI was independently associated with mortality and disability. Our findings support previous evidence on the SVI and builds on how this association persists even in those individuals with underlying contextual social vulnerability.

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Vidal Crespo, Natalia, Laura Enguita Arnal, Álvaro Gómez-Ferrer, Argimiro Collado Serra, Juan Manuel Mascarós, Ana Calatrava Fons, Juan Casanova Ramón-Borja, José Rubio Briones e Miguel Ramírez-Backhaus. "Bilateral Seminal Vesicle Invasion Is Not Associated with Worse Outcomes in Locally Advanced Prostate Carcinoma". Medicina 58, n. 8 (5 agosto 2022): 1057. http://dx.doi.org/10.3390/medicina58081057.

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Background and Objectives: Patients with seminal vesicle invasion (SVI) are a highly heterogeneous group. Prognosis can be affected by many clinical and pathological characteristics. Our aim was to study whether bilateral SVI (bi-SVI) is associated with worse oncological outcomes. Materials and Methods: This is an observational retrospective study that included 146 pT3b patients treated with radical prostatectomy (RP). We compared the results between unilateral SVI (uni-SVI) and bi-SVI. The log-rank test and Kaplan–Meier curves were used to compare biochemical recurrence-free survival (BCR), metastasis-free survival (MFS), and additional treatment-free survival. Cox proportional hazard models were used to identify predictors of BCR-free survival, MFS, and additional treatment-free survival. Results: 34.93% of patients had bi-SVI. The median follow-up was 46.84 months. No significant differences were seen between the uni-SVI and bi-SVI groups. BCR-free survival at 5 years was 33.31% and 25.65% (p = 0.44) for uni-SVI and bi-SVI. MFS at 5 years was 86.03% vs. 75.63% (p = 0.1), and additional treatment-free survival was 36.85% vs. 21.93% (p = 0.09), respectively. In the multivariate analysis, PSA was related to the development of BCR [HR 1.34 (95%CI: 1.01–1.77); p = 0.03] and metastasis [HR 1.83 (95%CI: 1.13–2.98); p = 0.02]. BCR was also influenced by lymph node infiltration [HR 2.74 (95%CI: 1.41–5.32); p = 0.003]. Additional treatment was performed more frequently in patients with positive margins [HR: 3.50 (95%CI: 1.65–7.44); p = 0.001]. Conclusions: SVI invasion is an adverse pathology feature, with a widely variable prognosis. In our study, bilateral seminal vesicle invasion did not predict worse outcomes in pT3b patients despite being associated with more undifferentiated tumors.

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Newman, Andrew J., Paul A. Kucera e Larry F. Bliven. "Presenting the Snowflake Video Imager (SVI)". Journal of Atmospheric and Oceanic Technology 26, n. 2 (1 febbraio 2009): 167–79. http://dx.doi.org/10.1175/2008jtecha1148.1.

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Abstract Herein the authors introduce the Snowflake Video Imager (SVI), which is a new instrument for characterizing frozen precipitation. An SVI utilizes a video camera with sufficient frame rate, pixels, and shutter speed to record thousands of snowflake images. The camera housing and lighting produce little airflow distortion, so SVI data are quite representative of natural conditions, which is important for volumetric data products such as snowflake size distributions. Long-duration, unattended operation of an SVI is feasible because datalogging software provides data compression and the hardware can operate for months in harsh winter conditions. Details of SVI hardware and field operation are given. Snowflake size distributions (SSDs) from a storm near Boulder, Colorado, are computed. An SVI is an imaging system, so SVI data can be utilized to compute diverse data products for various applications. In this paper, the authors present visualizations of frozen particles (i.e., snowflake aggregates as well as individual crystals), which provide insight into the weather conditions such as temperature, humidity, and winds.

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Wongburi, Praewa, e Jae K. Park. "Prediction of Sludge Volume Index in a Wastewater Treatment Plant Using Recurrent Neural Network". Sustainability 14, n. 10 (21 maggio 2022): 6276. http://dx.doi.org/10.3390/su14106276.

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Sludge Volume Index (SVI) is one of the most important operational parameters in an activated sludge process. It is difficult to predict SVI because of the nonlinearity of data and variability operation conditions. With complex time-series data from Wastewater Treatment Plants (WWTPs), the Recurrent Neural Network (RNN) with an Explainable Artificial Intelligence was applied to predict SVI and interpret the prediction result. RNN architecture has been proven to efficiently handle time-series and non-uniformity data. Moreover, due to the complexity of the model, the newly Explainable Artificial Intelligence concept was used to interpret the result. Data were collected from the Nine Springs Wastewater Treatment Plant, Madison, Wisconsin, and the data were analyzed and cleaned using Python program and data analytics approaches. An RNN model predicted SVI accurately after training with historical big data collected at the Nine Spring WWTP. The Explainable Artificial Intelligence (AI) analysis was able to determine which input parameters affected higher SVI most. The prediction of SVI will benefit WWTPs to establish corrective measures to maintaining stable SVI. The SVI prediction model and Explainable Artificial Intelligence method will help the wastewater treatment sector to improve operational performance, system management, and process reliability.

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Più fonti

Tesi sul tema "Svi"

Aurell, Alexander. "The SVI implied volatility model and its calibration". Thesis, KTH, Matematisk statistik, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-150575.

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The SVI implied volatility model is a parametric model for stochastic implied volatility.The SVI is interesting because of the possibility to state explicit conditions on its parameters so that the model does not generate prices where static arbitrage opportunities can occur. Calibration of the SVI model to real market data requires non-linear optimization algorithms and can be quite time consuming. In recent years, methods to calibrate the SVI model that use its inherent structure to reduce the dimensions of the optimization problem have been invented in order to speed up the calibration. The ?first aim of this thesis is to justify the use of the model and the no static arbitrage conditions from a theoretic point of view. Important theorems by Kellerer and Lee and their proofs are discussed in detail and the conditions are carefully derived. The second aim is to implement the model so that it can be calibrated to real market implied volatility data. A calibration method is presented and the outcome of two numerical experiments validate it. The performance of the calibration method introduced in this thesis is measured in how big a fraction of the total market volume the method manages to ?t within the market spread. Tests show that the model manages to ?t most of the market volume inside the spread, even for options with short time to maturity. Further tests show that the model is capable to recalibrate an SVI parameter set that allows for static arbitrage opportunities into an SVI parameter set that does not.
SVI-modellen är en parametrisk modell för stokastisk implicit volatilitet. Modellen är intressant då det har visat sig möjligt att ställa upp villkor på dess parametrar så att priser den genererar för köp- och säljoptioner är fria från statiskt arbitrage. För att kalibrera SVI-modellen till marknadsdata krävs olinjär optimering, vilket i en implementering kan vara tidskrävande. På senare tid har kalibreringsmetoder som använder den inneboende strukturen i SVI-modellens parametrisering för att reducera dimensionen på optimeringen tagits fram. Den här uppsatsen har två syften. Det första är att berättiga SVI-modellen och villkoren för eliminering av statiskt arbitrage. Detta görs med en genomgång av den underliggande teorin. Viktiga satser av Kellerer och Lee presenteras, bevisas och diskuteras. Det andra syftet är att konstruera en kalibreringsmetod som möjliggör anpassning av SVI-modellen till marknadsdata och implementera denna. Utfallet av två numeriska experiment validerar kalibreringsmetoden. Kalibreringsmetodens prestanda mäts i hur stor del av marknadsvolymen som SVI-modellen lyckas anpassa inom spridningen av priser på marknaden. Tester visar på att kalibreringsmetoden lyckas anpassa den största delen av priserna innanför spridningen. Vidare tester visar att kalibreringsmetoden klarar av att omkalibrera SVI-modellen så att en parametermängd som till en början ger statisk arbitrage omvärderas till en parametermängd som är fri från statiskt arbitrage.

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Burnos, Sergey, e ChaSing Ngow. "SVI estimation of the implied volatility by Kalman filter". Thesis, Högskolan i Halmstad, Sektionen för Informationsvetenskap, Data– och Elektroteknik (IDE), 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-13949.

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To understand and model the dynamics of the implied volatility smile is essential for trading, pricing and risk management portfolio. We suggest a linear Kalman filter for updating of the Stochastic Volatility Inspired (SVI) model of the volatility. From a risk management perspective we generate the 1-day ahead forecast of profit and loss (P\&L) of option portfolios. We compare the estimation of the implied volatility using the SVI model with the cubic polynomial model. We find that the SVI Kalman filter has outperformed the others.

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Escobar, Jose Alejandro. "Stress and fatigue analysis of svi-tested camshaft lobes". Thesis, Virginia Tech, 1996. http://hdl.handle.net/10919/36656.

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Nondestructive evaluation techniques were employed to fully characterize three 2.3L camshafts tested in an engine simulator for an equivalent of 100,000 miles. Optical microscopy, acoustic microscopy (SAM), and profilometry were used to characterize wear and fatigue, crack depth, and surface roughness, respectively. Results show cracking to occur mainly in the opening ramp of the most abusively ground cam lobes. No clear evidence was found for subsurface cracking at depths as great as 200 mm from the lobe's surface. Profilometry results show no evidence of any major tribological effect due to the sliding friction of the follower. Fractography studies show a difference between fracture surfaces among the cracks examined; straight cracks exhibit features resembling fatigue propagation, while fracture surfaces from pitted cracks show a more brittle behavior. Small grinding cracks (approximately 300 mm in length) were found in the opening ramps of the most abusively ground lobes prior to testing. Knoop and Nanoindenter microhardness indicate a near-surface rehardening for the most abusively ground lobe (confirmed by metallography), and temper burn for the remaining lobes. X-ray residual stress results made in the opening ramp of the tested lobes show evidence of residual stress relaxation. X-ray line width data as a function of depth does not correlate with residual stress.
Master of Science

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Yamamoto, Rubens Yoshio. "Estudo do método SVI aplicado à construção da volatilidade implícita para opções de ação e de índice no mercado brasileiro". Universidade de São Paulo, 2017. http://www.teses.usp.br/teses/disponiveis/55/55137/tde-19022018-144817/.

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Este trabalho tem por objetivo verificar a eficácia do modelo parametrizado SVI (Stochastic Volatility Inspired), apresentando-o como um método alternativo à construção da volatilidade implícita para opções de ações e de índice no mercado brasileiro. Primeiramente, o conceito financeiro de opção e sua teoria de precificação são apresentados, incluindo os modelos de Black-Scholes e Heston, a importância da volatilidade implícita e seu comportamento estocástico e detalhando o funcionamento de cada parâmetro do modelo SVI (Stochastic Volatility Inspired). Um algoritmo é desenvolvido em cima da base teórica, assim como sua implementação computacional. Além disso, são feitos experimentos com dados de mercado reais e seus resultados analisados e comparados com os de publicações anteriores.
This work aims to verify the efficiency of parameterized SVI (Stochastic Volatility Inspired) model, presenting it as an alternative method to construct the implied volatility for stock and index options in Brazilian market. First, the financial option concept and its pricing theory are presented, including Black-Scholes and Heston models, the importance of implied volatility and its stochastic behavior and detailing the operation of each parameter of the SVI (Stochastic Volatility Inspired) model. An algorithm is developed on top of the theoretical basis, as well as its computational implementation. In addition, experiments are performed with real market data and their results are analyzed and compared with those of previous publications.

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Eriksson, Gustaf, e Adam Arnö. "Rädsla eller rationalitet : En studie om sökintensitets effekt på läkemedelsbranschen i Sverige". Thesis, Uppsala universitet, Nationalekonomiska institutionen, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-447597.

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Coronapandemin har varit en faktor som påverkat i princip alla delar av samhället under senaste året med utspridda sociala och ekonomiska konsekvenser. Men är effekterna på aktiemarknaden verkligen drivna av rationella värdeförändringar i bolagen? Tidigare studier har, genom att mäta sökintensitet på internet och kurser på världsindex, dragit slutsatsen att det under 2020 funnits en stark koppling mellan rädsla för coronaviruset och utvecklingen på världens börser. Syftet med denna studie är att följa tidigare forskning men att specifikt analysera en bransch som enligt tidigare studier varit relativt motståndskraftig mot effekterna av coronaviruset. Denna studie undersöker kopplingen mellan rädsla för coronaviruset på börsen och aktiekurser inom läkemedelsbolag som handlas på Stockholmsbörsen. Studien utförs genom att titta på korrelationen mellan Google Search Volume Index (SVI) och aktiekurser på 28 läkemedelsbolag som handlas på Stockholmsbörsen. Utgångshypotesen är att det finns en koppling mellan rädsla för coronaviruset mätt genom SVI och aktiekurser inom läkemedelsbranschen. För att bedöma hypotesen görs en rad regressioner med aktiepriser inom läkemedelsbranschen som beroende variabel och SVI samt OMXS30 som oberoende variabler. Resultaten visar att det inte finns en stark koppling mellan SVI och aktiepriser i läkemedelsbranschen vilket leder till att huvudhypotesen förkastas. Slutligen diskuteras hur resultaten tyder på att en semistark form av den effektiva marknadshypotesen lyder på läkemedelsmarknaden men att flera inslag av beteendeekonomi påverkar prissättningen.

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Öhman, Adam. "The Calibrated SSVI Method - Implied Volatility Surface Construction". Thesis, KTH, Matematisk statistik, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-257501.

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In this thesis will the question of how to construct implied volatility surfaces in a robust and arbitrage free way be investigated. To be able to know if the solutions are arbitrage free was an initial investigation about arbitrage in volatility surfaces made. From this investigation where two comprehensive theorems found. These theorems came from Roper in \cite{Roper2010}. Based on these where then two applicable arbitrage tests created. These tests came to be very important tools in the remaining thesis.The most reasonable classes of models for modeling the implied volatility surface where then investigated. It was concluded that the classes that seemed to have the best potential where the stochastic volatility models and the parametric representation models. The choice between these two classes where concluded to be based on a trade-off between simplicity and quality of the result. If it where possible to make the parametric representation models improve its result the best applicable choice would be that class. For the remaining thesis was it therefore decided to investigate this class. The parametric representation model that was chosen to be investigated where the SVI parametrization family since it seemed to have the most potential outside of its already strong foundation.The SVI parametrization family is diveded into 3 parametrizations, the raw SVI parametrization, the SSVI parametrization and the eSSVI parametrization. It was concluded that the raw SVI parametrization even though it gives very good market fits, was not robust enough to be chosen. This ment that the raw SVI parametrization would in most cases generate arbitrage in its surfaces. The SSVI model was concluded to be a very strong model compared to the raw SVI, since it was able to generate completely arbitrage free solutions with good enough results. The eSSVI is an extended parametrization of the SSVI with purpose to improve its short maturity results. It was concluded to give small improvements but with the trade of making the optimization procedure harder. It was therefore concluded that the SSVI parametrization might be the better application.To try to improve the results of the SSVI parametrization was a complementary procedure developed which got named the calibrated SSVI method. This method compared to the eSSVI parametrization would not change the parametrization but instead focusing on calibrating the initial fit that the SSVI generated. This method would heavily improve the initial fit of the SSVI surface but was less robust since it generated harder cases for the interpolation and extrapolation.
I det här examensarbetet undersöks frågan om hur man bör modellera implied volatilitetsytor på ett robust och arbitragefritt sätt. För att kunna veta om lösningarna är arbigtragefria börjades arbetet med en undersökning inom arbitrageområdet. De mest heltäckande resultatet som hittades var två theorem av Roper i \cite{Roper2010}. Baserat på dessa theorem kunde två applicerbara arbitragetester skapas som sedan kom att bli en av hörnstenarna i detta arbete. Genom att undersöka de modellklasser som verkade vara de bästa inom området valdes den parametriseringsbeskrivande modellklassen. I denna klass valdes sedan SVI parametriseringsfamiljen för vidare undersökning eftersom det verkade vara den familj av modeller som hade störst potential att uppnå jämnvikt mellan enkel applikation samt bra resultat. För den klassiska SVI modellen i SVI familjen drogs slutsatsen att modellen inte var tillräcklig för att kunna rekommenderas. Detta berodde på att SVI modellen i princip alltid genererade lösningar med arbitrage i. SVI modellen genererar dock väldigt bra lösningar mot marknadsdatan enskilt och kan därför vara ett bra alternativ om man bara ska modellera ett implied volatilitetssmil. SSVI modellen ansågs däremot vara ett väldigt bra alternativ. SSVI modellen genererar komplett aribragefria lösningar men har samtidigt rimligt bra marknadspassning. För att försöka förbättra resultaten från SSVI modellen, var en kompleterande metod kallad den kalibrerade SSVI metoden skapad. Denna metod kom att förbättra marknadspassningen som SSVI modellen genererade men som resultat kom robustheten att sjunka, då interpoleringen och extrapoleringen blev svårare att genomföra arbitragefritt.

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Leach, Dennis, e Mikael Gärtner. "Företagsspecifika Google-sökningars prediktionsmöjligheter på börsintroduktioners slutkurser". Thesis, Uppsala universitet, Nationalekonomiska institutionen, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-435321.

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With the help of investor search behavior on Google, we study the possibilities of predicting the closing price of an initial public offering after its first day on the market. During the sample period of 2017 to 2020 we find a significant positive correlation between companies whose name has an increased google-search-value during its initial offering period, and a higher return after the first day on the market.
Denna uppsats undersöker möjligheterna att använda sig av företagsspecifika Googlesökningar för att predicera en akties slutkurs första handelsdag efter en börsintroduktion. Under observationsperioden 2017 till 2020 finner vi ett signifikant positivt samband mellan de företag vars namn ökar i antal sökningar på Google under teckningsperioden, och en högre avkastning under första handelsdag.

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Li, Daohe. "Sui shi min su yu gu xiao shuo yan jiu". Tianjin Shi : Tianjin gu ji chu ban she, 2004.

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Byström, Viktoria. "När SVE blir SVA : En studie av ett läromedel i svenska för gymnasieskolan". Thesis, Linnéuniversitetet, Institutionen för svenska språket (SV), 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-104733.

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Syftet med denna studie är att undersöka vad som händer när ett läromedel i kursen Svenska 1 ändras och anpassas till kursen Svenska som andraspråk 1. I undersökningen har granskats huruvida innehållet i de båda läromedlens kapitel om språksociologi motsvarar intentionerna i det centrala innehållet. Dessutom har de innehållsliga och formmässiga förändringar SVE-boken genomgått för att bli SVA studerats. Genom närläsning av de bägge kapitlen har innehåll och språklig form granskats, och fynden har kategoriserats och analyserats. De viktigaste resultaten är att stoffet i läromedlen motsvarar det centrala innehållet relativt väl, men att det finns en avsevärd skillnad i innehållet mellan de båda bokversionerna. Språket har när SVE blivit SVA vid enstaka tillfällen förenklats, vilket gett innehållsliga skillnader, men har i övrigt inte ändrats i någon väsentlig grad.

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Min, Xiangpeng. "Sui tang wu dai shi qi hai yang zai hai chu bu yan jiu". Henan : Zheng zhou da xue, 2006. http://anulib.anu.edu.au/anuonly/ebooks/chinese_thesis_032.pdf.

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Libri sul tema "Svi"

Svi moji. Cetinje: OKF, 2017.

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Ćirilov, Jovan. Svi moji savremenici. Beograd: Laguna, 2010.

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Svi kapetanovi brodolomi. Zagreb: Durieux, 1992.

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Svi vladari Srbije. 2^a ed. Despotovac: Narodna biblioteka "Resavska škola", 1997.

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Svi naši nacionalizmi. Valjevo: "Milić Rakić", design Spomenka Aleckovic, 1986.

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Marković, Vida E. Svi moji univerziteti. Beograd: Čin, 2000.

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Svi moji savremenici. Beograd: Prosveta, 2007.

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Svi darovi: Pesme. Beograd: Književno društvo Sveti Sava, 2005.

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Paunović, Simonida. Svi moji anđeli. Beograd: Čigoja štampa, 2013.

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Ćirilov, Jovan. Svi moji savremenici. Beograd: Laguna, 2010.

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Capitoli di libri sul tema "Svi"

Penkett, S. A. "Laboratory Studies of the Multiphase SIV → SVI Conversion Rate". In Chemistry of Multiphase Atmospheric Systems, 507–39. Berlin, Heidelberg: Springer Berlin Heidelberg, 1986. http://dx.doi.org/10.1007/978-3-642-70627-1_19.

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Qiu, Waishan, Wenjing Li, Xun Liu e Xiaokai Huang. "Subjectively Measured Streetscape Qualities for Shanghai with Large-Scale Application of Computer Vision and Machine Learning". In Proceedings of the 2021 DigitalFUTURES, 242–51. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-5983-6_23.

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AbstractRecently, many new studies emerged to apply computer vision (CV) to street view imagery (SVI) dataset to objectively extract the view indices of various streetscape features such as trees to proxy urban scene qualities. However, human perceptions (e.g., imageability) have a subtle relationship to visual elements which cannot be fully captured using view indices. Conversely, subjective measures using survey and interview data explain more human behaviors. However, the effectiveness of integrating subjective measures with SVI dataset has been less discussed. To address this, we integrated crowdsourcing, CV, and machine learning (ML) to subjectively measure four important perceptions suggested by classical urban design theory. We first collected experts’ rating on sample SVIs regarding the four qualities which became the training labels. CV segmentation was applied to SVI samples extracting streetscape view indices as the explanatory variables. We then trained ML models and achieved high accuracy in predicting the scores. We found a strong correlation between predicted complexity score and the density of urban amenities and services Point of Interests (POI), which validates the effectiveness of subjective measures. In addition, to test the generalizability of the proposed framework as well as to inform urban renewal strategies, we compared the measured qualities in Pudong to other five renowned urban cores worldwide. Rather than predicting perceptual scores directly from generic image features using convolution neural network, our approach follows what urban design theory suggested and confirms various streetscape features affecting multi-dimensional human perceptions. Therefore, its result provides more interpretable and actionable implications for policymakers and city planners.

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Ferscha, Alois, e Siani Pearson. "DOA-SVI 2012 PC Co-Chairs Message". In On the Move to Meaningful Internet Systems: OTM 2012, 469. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-33615-7_1.

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Damiani, Ernesto, Doug Schmidt e Beng Chin Ooi. "DOA-SVI 2011 PC Co-chairs’ Message". In On the Move to Meaningful Internet Systems: OTM 2011, 431. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-25106-1_1.

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Szeląg, Bartosz, Jarosław Gawdzik e Jan Studziński. "Sludge Volume Index (SVI) Modelling: Data Mining Approach". In Information Systems Architecture and Technology: Proceedings of 38th International Conference on Information Systems Architecture and Technology – ISAT 2017, 324–35. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-67223-6_31.

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Surase, Rupali R., Karbhari V. Kale, Mahesh M. Solankar, Amarsinh B. Varpe, Hanumant R. Gite e Amol D. Vibhute. "Crop Discrimination Based on Reflectance Spectroscopy Using Spectral Vegetation Indices (SVI)". In Communications in Computer and Information Science, 312–22. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-13-9187-3_27.

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Missier, Paolo, Eldarina Wijaya, Ryan Kirby e Michael Keogh. "SVI: A Simple Single-Nucleotide Human Variant Interpretation Tool for Clinical Use". In Lecture Notes in Computer Science, 180–94. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-21843-4_14.

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Regev, Dafna. "Art Therapy for Blind Students or with a Severe Visual Impairment (B/SVI)". In Art Therapy with Special Education Students, 41–61. New York: Routledge, 2022. http://dx.doi.org/10.4324/9781003156918-3.

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Yasrebi, Pouya, Spandan Bemby, Hadi Bannazadeh e Alberto Leon-Garcia. "VNF Service Chaining on SAVI SDI". In Lecture Notes of the Institute for Computer Sciences, Social Informatics and Telecommunications Engineering, 11–17. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-27072-2_2.

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Kiernan, Matthew J. "SRI or Not SRI?" In Environmental Alpha, 125–44. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2011. http://dx.doi.org/10.1002/9781118266748.ch6.

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Atti di convegni sul tema "Svi"

Mines, Jr., R. O., e C. R. Horn. "Misconceptions about Unstirred SVI". In World Water and Environmental Resources Congress 2004. Reston, VA: American Society of Civil Engineers, 2004. http://dx.doi.org/10.1061/40737(2004)292.

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Sikoyo, Namarome, Betty Ezati, Dianah Nampijja, Micheal Walimbwa, Daniel Okot, Joyce Ayikoru, Godfrey Onyait e Ronald Luyima. "nlocking Potential for Enhanced Teaching and Learning of Students with Visual Impairment in Uganda’s Public Universities: the Role of Assistive Technologies". In Tenth Pan-Commonwealth Forum on Open Learning. Commonwealth of Learning, 2022. http://dx.doi.org/10.56059/pcf10.7483.

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Enrolment of students with visual impairment (SVI) in Uganda’s universities is increasing amidst limited awareness and capacity of educators to effectively support their learning despite the existence of policies aimed at improving their learning. Makerere University in partnership with Kyambogo University; the National Council for Higher Education and the Uganda National Association of the Blind is implementing a project to address the staff capacity constraints to support SVI in two public universities. // The goal of the project is to build capacity in public universities to provide an inclusive teaching and learning environment for the SVI through effective usage of assistive technologies. The project adopted a combination of a qualitative interpretivist and Design Based Research to analyze the contexts in which public universities provide education to SVI; and secondly, to train staff and SVI in using selected assistive technologies to support the teaching and learning of SVI. A Situational analysis was conducted from three public universities with a sample of 29 students with visual impairment, 17 teaching staff, 09 academic leaders (Dean and Heads of department) and 18 administrative staff. // A three-week blended learning training was developed based on the data from the situational analysis and offered to 40 staff members from two universities. The trained staff are implementing action points from the training in their practices. SVIs in the two universities have also been oriented to the assistive technologies. The papers share findings from the project this far.

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TOWNLEY, GARY. "The implementation and use of a general SVI eigensolver". In 29th Structures, Structural Dynamics and Materials Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 1988. http://dx.doi.org/10.2514/6.1988-2394.

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Deleanu, Lorena, Gabriel Andrei e Laura Maftei. "Surface Characterization of Polymer Composite Using Bearing Area Curve". In ASME 2010 10th Biennial Conference on Engineering Systems Design and Analysis. ASMEDC, 2010. http://dx.doi.org/10.1115/esda2010-25330.

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This paper presents an analysis of several 3D parameters based on bearing area curve in order to use the information for establishing the influence of sliding regime against steel on the tribological behavior of a composite class with polyamide matrix and 1% of black carbon. There were done pin-on-disk tests for different concentrations of micro glass spheres (MGS): 2.5, 5, 10, 20, 30 and 50% (wt), respectively. The polymer was tested under similar conditions in order to have a reference basis and to point out the improvement in tribological behavior when adding this reinforcement material. The surface topographies were registered with the help of PRO500 3D (stylus) Profilometer. The test parameters in dry regime were: sliding speed 0.5, 1.0 and 1.5 m/s, average pressure 1, 2 and 3 MPa, respectively. There were analyzed the influence of MGS concentration and sliding regime on wear as mass loss of the composite discs, after 10,000 m of sliding, the friction coefficient and several 3D parameters related to the bearing area curve, determined from raw profiles (surface bearing index – Sbi, core fluid retention index – Sci, valley fluid retention index, Svi, reduced summit height, Spk, core roughness depth, Sk, and reduced valley depth, Svk).

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Cebrián, Eduardo, e Josep Domenech. "Simulating the inconsistencies of Google Trends data". In CARMA 2022 - 4th International Conference on Advanced Research Methods and Analytics. valencia: Universitat Politècnica de València, 2022. http://dx.doi.org/10.4995/carma2022.2022.15093.

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Google Trends (GT) allows users to obtain reports of the evolution of the popularity of searchers made through the Google Search engine. Its main output is the Search Volume Index (SVI), a relative measure of the popularity of a term, which is computed using a sample of the searches. Due to the sampling error, the reports are not completely consistent, as the same query produces different time series that can widely change from day to day. This paper simulates the process of generating the SVI time series in the same way as GT does. By doing this, it has been shown that the sampling error could be an important issue if the popularity of the term under study is relatively low. Averaging multiple extractions from GT can only partially alleviate this.

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Khan, Muhammad Burhan, Humaira Nisar, Choon Aun Ng e Po Kim Lo. "Estimation of sludge volume index (SVI) using bright field activated sludge images". In 2016 IEEE International Instrumentation and Measurement Technology Conference (I2MTC). IEEE, 2016. http://dx.doi.org/10.1109/i2mtc.2016.7520397.

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Guo Min, Geng Ya-nan e Han Hong-gui. "A SVI soft sensor model based on improved PSO-Elman neural network". In 2014 11th World Congress on Intelligent Control and Automation (WCICA). IEEE, 2014. http://dx.doi.org/10.1109/wcica.2014.7053305.

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Aini, R. Q., D. Aldila e K. A. Sugeng. "Basic reproduction number of a multi-patch SVI model represented as a star graph topology". In PROCEEDINGS OF THE 3RD INTERNATIONAL SYMPOSIUM ON CURRENT PROGRESS IN MATHEMATICS AND SCIENCES 2017 (ISCPMS2017). Author(s), 2018. http://dx.doi.org/10.1063/1.5064234.

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Vemagiri, T., e Sridhar Savarapu. "Fuzzy Logic Based Sensorless Control of Five Phase IPMSM Drives Through HF-SVI Into Third Harmonic Space". In 2021 IEEE 2nd International Conference on Applied Electromagnetics, Signal Processing, & Communication (AESPC). IEEE, 2021. http://dx.doi.org/10.1109/aespc52704.2021.9708512.

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Roksandić, Drago. "„Kud koje žure brzi kraci / a vode svi u bespuće“: Vladan Desnica u Splitu od 1935. do 1941. godine". In Split i Vladan Desnica 1918. – 1945.: umjetničko stvaralaštvo između kulture i politike: zbornik radova sa znanstvenog skupa Desničini susreti 2015. Filozofski fakultet u Zagrebu, FF-Press, 2016. http://dx.doi.org/10.17234/desnicini_susreti2015.25.

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Rapporti di organizzazioni sul tema "Svi"

Alleva, D. SVI: Super-VIOR interface routines. Office of Scientific and Technical Information (OSTI), ottobre 1987. http://dx.doi.org/10.2172/5876413.

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Ng, Amanda, Dzifa Adjaye-Gbewonyo e Lindsey Black. Regular Bedtimes Among Children Aged 5–17 Years: United States, 2020. National Center for Health Statistics (U.S.), giugno 2022. http://dx.doi.org/10.15620/cdc:117490.

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This report uses data from the 2020 National Health Interview Survey (NHIS) to describe regular bedtimes, defined as going to sleep at the same time most days or every day in a typical school week, among children aged 5–17 years. Estimates are presented by sociodemographic characteristics, family type, social vulnerability index (SVI), family income, and urbanicity of residence.

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LAST, FIRST MIDDLE. STI. Office of Scientific and Technical Information (OSTI), gennaio 1986. http://dx.doi.org/10.2172/1399652.

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Brownlee, N. SVG Drawings for RFCs: SVG 1.2 RFC. RFC Editor, dicembre 2016. http://dx.doi.org/10.17487/rfc7996.

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Zeller, Sam, Rob Kutschke e Heath O'Connell. Fermilab STI. Office of Scientific and Technical Information (OSTI), novembre 2017. http://dx.doi.org/10.2172/1570204.

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Roback, Edward. SRI International:. Gaithersburg, MD: National Institute of Standards and Technology, 1990. http://dx.doi.org/10.6028/nist.ir.4453.

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Last, First Middle. STI Product Title. Office of Scientific and Technical Information (OSTI), gennaio 2017. http://dx.doi.org/10.2172/1395703.

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last, first middle. sti product title. Office of Scientific and Technical Information (OSTI), gennaio 1986. http://dx.doi.org/10.2172/1423740.

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Last, First Middle. STI Product Title. Office of Scientific and Technical Information (OSTI), marzo 2018. http://dx.doi.org/10.2172/1429230.

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Last Name, First Name. STI Product Title. Office of Scientific and Technical Information (OSTI), gennaio 1986. http://dx.doi.org/10.2172/1429240.

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