Results 11 to 20 of about 1,854,912 (269)
Time-Varying Semidefinite Programs [PDF]
Mathematics of Operations Research, 2021 We study time-varying semidefinite programs (TV-SDPs), which are semidefinite programs whose data (and solutions) are functions of time. Our focus is on the setting where the data vary polynomially with time. We show that under a strict feasibility assumption, restricting the solutions to also be polynomial functions of time does not change the ...
Amir Ali Ahmadi, Bachir El Khadir
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Time-varying testosterone level and risk of myocardial infarction and stroke among hypogonadal men: a longitudinal study in Germany [PDF]
Journal of Men's Health, 2022 Background and objective: Findings on the association between testosterone and cardiovascular risk in men have been inconsistent. Previous studies investigated this association based on testosterone level measured at one single point in time (e.g ...
Xiao Zhang +7 more
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On a Novel Model for ECG Signals and its Statistical Properties
IEEE Access, 2023 An accurate mathematical ECG model helps comprehend the heart’s workings, which in turn helps identify various heart-related abnormalities. A typical ECG waveform consists of recurrent QRS complexes at almost regular intervals. In the most general
Ayan Kumar Dutta +2 more
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ISPRS International Journal of Geo-Information, 2021 Static traffic assignment (STA) models have been widely utilized in the field of strategic transport planning. However, STA models cannot fully represent the dynamic road conditions and suffer from inaccurate assignment during traffic congestion.
Xing Zeng +3 more
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Time-Varying Convergences of Environmental Footprint Levels between European Countries
Energies, 2021 This study proposes the time-varying nonlinear panel unit root test to investigate the convergence of ecological foot prints between the EU and candidate countries.
Durmuş Çağrı Yıldırım +5 more
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Applied Sciences, 2021 Data classification is a challenging problem. Data classification is very sensitive to the noise and high dimensionality of the data. Being able to reduce the model complexity can help to improve the accuracy of the classification model performance ...
Hamouda Chantar +4 more
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TIME-VARYING COINTEGRATION [PDF]
Econometric Theory, 2010 In this paper we propose a time-varying vector error correction model in which the cointegrating relationship varies smoothly over time. The Johansen setup is a special case of our model. A likelihood ratio test for time-invariant cointegration is defined and its asymptotic chi-square distribution is derived.
Bierens, H., Martins, L. F.
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A Transmission of Beta Herding during Subprime Crisis in Taiwan’s Market: DCC-MIDAS Approach
International Journal of Financial Studies, 2021 The aim of this study is to investigate the herding of beta transmission between return and volatility. We have used the dynamic conditional correlation model with the mixed-data sampling (DCC-MIDAS) model for the analysis. The evidence demonstrates that
Yi-Chang Chen +3 more
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Survivability in time-varying networks [PDF]
IEEE INFOCOM 2016 - The 35th Annual IEEE International Conference on Computer Communications, 2016 Time-varying graphs are a useful model for networks with dynamic connectivity such as vehicular networks, yet, despite their great modeling power, many important features of time-varying graphs are still poorly understood. In this paper, we study the survivability properties of time-varying networks against unpredictable interruptions.
Liang, Qingkai, Modiano, Eytan H
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A Data-Driven Customer-Search Modeling With the Consideration of Traffic Environment
Frontiers in Public Health, 2022 In order to explore the determinants of vacant taxi drivers' customer-search behavior, this paper intends to calibrate a time-dependent Multinomial Logit (MNL) model by mining over 1.6 billion GPS records from about 8,400 taxis in Shanghai, China. First,
Lan Yu +4 more
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