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Abdeljabbar Es-saghiri,Abdenabi Brahmi,Aumeur El Amrani 한국물리학회 2020 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.76 No.6
This paper reports the performance of a pentacene-based organic thin film transistor (OTFT) that was investigated using numerical simulations for different pentacene thicknesses. The studied OTFTs showed a peak mobility in the saturation region of 5 × 10^{-2}cm^2V^{-1}s^{-1} for a pentacene thickness of 50 nm. Furthermore, an optimum Ion/Ioff current ratio of 3.5 × 10^5 was observed for a similar pentacene thickness of about 50 nm. Moreover, the threshold voltage and the sub-threshold slope were significantly affected and decreased with increasing pentacene thickness. In addition, based on our proposed approach and the simulation results, we noticed that a penatcene thickness of 50 nm remained the optimum value for the active layer channel in order to obtain optimal performance from the OTFT devices.
Least squares estimator for non-ergodic Ornstein–Uhlenbeck processes driven by Gaussian processes
Mohamed El Machkouri,Khalifa Es-Sebaiy,Youssef Ouknine 한국통계학회 2016 Journal of the Korean Statistical Society Vol.45 No.3
The statistical analysis for equations driven by fractional Gaussian process (fGp) is relatively recent. The development of stochastic calculus with respect to the fGp allowed to study such models. In the present paper we consider the drift parameter estimation problem for the non-ergodic Ornstein–Uhlenbeck process defined as dXt = θXt dt + dGt , t ≥ 0 with an unknown parameter θ > 0, where G is a Gaussian process. We provide sufficient conditions, based on the properties of G, ensuring the strong consistency and the asymptotic distribution of our estimatorθt of θ based on the observation {Xs, s ∈ [0, t]} as t → ∞. Our approach offers an elementary, unifying proof of Belfadli (2011), and it allows to extend the result of Belfadli (2011) to the case when G is a fractional Brownian motion with Hurst parameter H ∈ (0, 1). We also discuss the cases of subfractional Brownian motion and bifractional Brownian motion.
Manic Episode Associated with Mega Cisterna Magna
Tayfun Turan,Aslı Bes¸irll,Akif Asdemir,Saliha Özsoy,Ertug˘rul Es¸el 대한신경정신의학회 2010 PSYCHIATRY INVESTIGATION Vol.7 No.4
Mega cisterna magna is a part of “Dandy-Walker Complex” and it is characterized by the enlargement of the cisterna magna, morphologically intact vermis and cerebellar hemispheres. We report a case of manic attack in a 23-year-old man with mega cisterna magna. The patient was treated with quetiapine 1,000 mg/day and sodium valproate 1,500 mg/day and the symptoms were ameliorated within 2.5 months. In this case, mega cisterna magna and manic symptoms may be found together coincidentally or any cerebellar dysfunction due to mega cisterna magna may cause or contribute to the appearance of affective symptoms. To our knowledge, this is the first case reporting manic attack with psychotic symptoms associated with mega cisterna magna. This report suggests that any lesion in the cerebellum might contribute to the occurrences of some affective and psychotic symptoms seen in bipolar disorder.