Resource
2019 EN
SAMM Jean-Marc Bardet · SAMM Kare Kamila · THEMA William Kengne
This paper studies the model selection problem in a large class of causaltime series models, which includes both the ARMA or AR($\infty$) processes, aswell as the GARCH or ARCH($\infty$), APARCH, ARMA-GARCH and many othersprocesses. To tackle this issue, we consider a penalized contrast based on thequasi-likelihood of the model. We provide sufficient conditions for the penaltyterm to ensure the consistency of the proposed procedure as well as theconsistency and the asymptotic normality of the quasi-maximum likelihoodestimator of the chosen model. It appears from these conditions that theBayesian Information Criterion (BIC) does not always guarantee the consistency.We also propose a tool for diagnosing the goodness-of-fit of the chosen modelbased on the portmanteau Test. Numerical simulations and an illustrativeexample on the FTSE index are performed to highlight the obtained asymptoticresults, including a numerical evidence of the non consistency of the usual BICpenalty for order selection of an AR(p) models with ARCH($\infty$) errors.
Resource
2019 EN
Atanaska Dobreva · Renee Brady · Kamila Larripa
+3 more
Uncontrolled, excessive production of pro-inflammatory mediators from immunecells and traumatized tissues can cause systemic inflammatory issues likesepsis, one of the ten leading causes of death in the United States and one ofthe three leading causes of death in the intensive care unit. Understanding theeffects of inflammation on the autonomic control system can improve a patient'schance of recovery after an inflammatory event such as surgery. Though theeffects of the autonomic response on the inflammatory system are well defined,there remains a gap in understanding the reverse response. Specifically, theimpact of the inflammatory response on the autonomic control system remainsunknown. In this study, we investigate hypothesized interactions of theinflammatory system with the thermal and cardiovascular regulatory systems inresponse to an endotoxin challenge using mathematical modeling. We calibratethe model to data from two independent studies: a) of the inflammatory responsein healthy young men and b) a comparative study of the inflammatory responsebetween mice and humans. Simulation analysis is used to explore how the modelresponds to pathological input and treatment, specifically antibiotics,antipyretics, vasopressors, and combination therapy. Our findings show thatmultimodal treatment that simultaneously targets both the pathogen and theinfection symptoms gives the most favorable recovery outcome.
Resource
2019 EN
Kamila Sieja · Stéphane Goriely
We present recent shell-model calculations of the gamma-decay in sd-pf andpf-shell nuclei. We focus on the M1 part of the dipole strength which was shownto exhibit interesting low-energy effects, in particular a low-energyenhancement which can have a considerable impact on the radiative neutroncapture. We discuss the persistence of the shell effects in the nuclearquasi-continuum and the relation between the shape of the strength function atlow energy and nuclear deformation.
Resource
2019 EN
M. Cristina Câmara · Kamila Kliś--Garlicka · Bartosz Łanucha
+1 more
Conjugations in space $L^2$ of the unit circle commuting with multiplicationby $z$ or intertwining multiplications by $z$ and $\bar z$ are characterized.We also study their behaviour with respect to the Hardy space, subspacesinvariant for the unilateral shift and model spaces.
Resource
2019 EN
M. Cristina Câmara · Kamila Kliś-Garlicka · Bartosz Łanucha
+1 more
Asymmetric dual truncated Toeplitz operators acting between the orthogonalcomplements of two (eventually different) model spaces are introduced andstudied. They are shown to be equivalent after extension to paired operators on$L^2(\mathbb T) \oplus L^2(\mathbb T)$ and, if their symbols are invertible in$L^\infty(\mathbb T)$, to asymmetric truncated Toeplitz operators with theinverse symbol. Relations with Carleson's corona theorem are also established.These results are used to study the Fredholmness, the invertibility and thespectra of various classes of dual truncated Toeplitz operators.
Resource
2019 EN
M. Cristina Câmara · Kamila Kliś--Garlicka · Bartosz Łanucha
+1 more
Conjugations commuting with $\mathbf{M}_z$ and intertwining $\mathbf{M}_z$and $\mathbf{M}_{\bar z}$ in $L^2(\mathcal{H})$, where $\mathcal{H}$ is aHilbert space, are characterized. We also investigate which of them leaveinvariant the whole Hardy space $H^2(\mathcal{H})$ or a model space$K_{\Theta}=H^2(\mathcal{H})\ominus\Theta H^2(\mathcal{H})$, where $\Theta$ isa pure operator valued inner function.
Resource
2019 EN
Bikash Chakraborty · Sudip Saha · Amit Kumar Pal
+1 more
Let $f$ be a transcendental meromorphic function defined in the complex plane$\mathbb{C}$. We consider the value distribution of the differential polynomial$f^{q_{0}}(f^{(k)})^{q_{k}}$, where $q_{0}(\geq 2), q_{k}(\geq 1)$ are$k(\geq1)$ non-negative integers. We obtain a quantitative estimation of thecharacteristic function $T(r, f)$ in terms of$\overline{N}\left(r,\frac{1}{f^{q_{_{0}}}(f^{(k)})^{q_{k}}-1}\right)$.\par Ourresult generalizes the results obtained by Xu et al. (Math. Inequal. Appl., 14,93-100, 2011) and Karmakar and Sahoo (Results Math., 73, 2018) for a particularclass of transcendental meromorphic functions.
Journals
2019 EN
Salaouatchi Hichem Sofiane · Ait Yahia Kamila · Adja Hamida.
Corporate governance has received the most attention in recent years. While this new practice is extensively discussed, it is not always well understood, especially at family enterprises. Bearing these are the oldest and most widespread form of business organization in the world and play a leading role in economic growth and employment of the workforce. As a result, in this study we focused on highlighting the main characteristics of the family enterprise compared to the managerial enterprise in terms of its governance and structures
Journals
2019 EN
Tomasz Oniszczuk · Anna Oniszczuk · Ewa Gondek
+6 more
The growth of fish is directly dependent on feed composition and quality. Medicinal plants can be added to fish feed as adjuvant therapy for the prevention of fish diseases. The purple coneflower (Echinacea purpurea (L.) Moench.) has been reported to have multiple biological effects, including immunomodulatory and antioxidant activity. The most active compounds of E. purpurea are polyphenols - caffeic acid derivatives: caftaric acid, chlorogenic acid, cynarin, echinacoside and cichoric acid. Due to a relatively limited number of studies on the use of the purple coneflower as a nutritional supplement for fish feeding, extruded fish feed with addition of Echinacea roots was produced. In the feed total phenolic content, selected polyphenol contents, the energetic value, nutrient contents and antioxidant capacity were examined.
Journals
2019 EN
Kamila Ait Yahia · Hichem-Sofiane Salaouatchi.
This contribution analyzes the impact that territorial promotion could have on improving attractiveness and territorial competitiveness in Algeria. The results of a qualitative study conducted with institutional actors in Algeria identified inadequacy of current actions in territorial promotion with the expectations of foreign investors.