504 research outputs found

    Valuation of Interest Rate Options in a Two-Factor Model of the Term Structure of Interest Rate.

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    Nous présentons un modèle de la structure par terme des taux d'intérêt à deux variables d'état : le taux d'intérêt instantané et sa valeur moyenne observée sur une courte période. Le choix des facteurs est fondé sur les résultats de tests empiriques de la gamme des taux et tente de pallier les faiblesses théoriques des modèles existants. Dans le cadre de ce modèle, nous évaluons les options sur obligations et sur contrats forward et futures d'obligations.interest rates, finance

    Optimising radio coverage for wireless media servers

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    Differentially Expressed MicroRNAs Act As Inhibitors of BDNF in Prefrontal Cortex - Implications for Schizophrenia: A Dissertation

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    During my thesis work I studied the expression and potential function of brain expressed microRNAs (miRNAs) in human prefrontal cortex (PFC). Initially, I used combinatorial computational analysis and microarray data to identify miRNAs that are predicted with high probability to target the human Brain Derived Neurotrophic Factor (BDNF) 3’ Untranslated Region (3’UTR) and are expressed in moderate to high levels in adult human prefrontal cortex. A subset of 10 miRNAs segregating into 5 different miRNA families (miR-30a-d, miR-103/107, miR-16/195, miR-191 and miR-495) met the above criteria. I then designed a protocol to detect these miRNAs with Locked Nucleic Acid (LNA) in situ hybridization in human prefrontal cortex and determine their layer and cellular expression patterns. LNA in situ revealed differential lamina and cellular enrichment of BDNF-related miRNAs. As an example, miR-30a-5p was found to be enriched in large pyramidal neurons of layer 3, which was verified using laser capture microdissection of layer 3 pyramidal neurons and quantitative Real Time Polymerase Chain Reaction (qRT-PCR) following dissection of upper and deeper layers of human PFC. Parallel to this, I used miRNA qRT-PCR to determine the developmental expression of miRNAs using postmortem PFC tissues ranging from embryonic age to old adulthood and compared miRNA to BDNF protein levels. My results revealed a robust inverse correlation between BDNF-related miRNAs and BDNF protein during late maturation and aging of human prefrontal cortex. In vitro luciferase assays and/or lentivirus mediated neuronal miRNA overexpression experiments validated that at least two miRNAs, miR-30a-5p and miR-195, target human BDNF 3’UTR and mediate its translational repression. In the second part of my thesis work I measured levels of miR-30a and miR-195 in the prefrontal cortex of patients with schizophrenia and compared them with levels of BDNF protein and BDNF-related GABAergic mRNAs. According to my results differences in miR-195 levels in a subset of subjects diagnosed with schizophrenia were found to be associated with disease related changes in BDNF protein levels and deficits in BDNF dependent GABAergic gene expression. In the last part of my work I focused on miR-30b, another member of the miR-30 family, which I found to be reduced in the prefrontal cortex of female but not male subjects with schizophrenia. More importantly, disease related changes in miR-30b levels were strongly associated with the age of onset of the disease. Additional experiments in mouse cortex and hippocampus revealed a gender dimorphic expression pattern of this miRNA with higher expression in female brain. Collectively, my results suggest that miRNAs could participate in novel molecular pathways that play an important role during cortical development and maturation and are potentially linked to the pathophysiology of neuropsychiatric disease

    Closed-loop antenna selection for wireless LANs with directional & omni-directional elements

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    Throughput sensitivity to antenna pattern and orientation in 802.11n networks

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    La gestion des risques financiers par les entreprises : explications théoriques versus études théoriques.

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    La gestion des risques financiers ou couverture des risques, à l'aide des produits dérivés, est une des composantes de la politique financière des entreprises. Paradoxalement, le même raisonnement d'absence d'opportunités d'arbitrage qui permet, par exemple, de déterminer le nombre de contrats de ces actifs, peut conduire, dans le cadre du paradigme de Modigliani-Miller, à l'impertinence de la gestion des risques. En relâchant certaines des hypothèses de ce paradigme, il est possible de montrer que les entreprises peuvent être amenées à couvrir leurs risques. Nous discutons et analysons la logique sous-jacente des apports théoriques et du lien, notamment, entre la gestion des risques financiers et la valeur de la firme, ainsi que de résultats des tests empiriques. L'utilisation des produits dérivés exige une compréhension approfondie de ces produits et de leurs mécanismes, ainsi que des déterminants de la gestion des risques par les entreprises. Cette recherche s’appuie sur une enquête qualitative menée par le biais d’entretiens auprès de responsables financiers de 8 clubs professionnels de 5 sports collectifs. Elle s’intéresse à la fois à ce que font et disent les responsables. Elle aboutit à des logiques explicatives du type de contrôle dans les organisations en fonction des pressions de l’environnement. On constate que ce sont les clubs évoluant dans les disciplines sportives les moins médiatisées qui subissent les plus fortes pressions de l’environnement institutionnel, conduisant à un contrôle de conformité. A l’opposé les clubs évoluant dans les disciplines sportives les plus médiatisées ont mis en place un véritable contrôle d’opportunité (sur le triptyque objectifs/moyens/résultats). Entre ces deux logiques il existe des clubs en situation d’apprentissage pour lesquels la gouvernance institutionnelle constitue un formidable levier.risques financiers, produits financiers dérivés

    The community resources of Quincy, Massachusetts.

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    Thesis (Ed.M.)--Boston Universit

    Evaluating the effect of antenna tilt and rotation on antenna performance in an indoor environment

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    The Emerging Role of microRNAs in Schizophrenia and Autism Spectrum Disorders

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    MicroRNAs (miRNAs) are small non-coding RNAs conserved throughout evolution whose perceived importance for brain development and maturation is increasingly being understood. Although a plethora of new discoveries have provided novel insights into miRNA-mediated molecular mechanisms that influence brain plasticity, their relevance for neuropsychiatric diseases with known deficits in synaptic plasticity, such as schizophrenia and autism, has not been adequately explored. In this review we discuss the intersection between current and old knowledge on the role of miRNAs in brain plasticity and function with a focus in the potential involvement of brain expressed miRNAs in the pathophysiology of neuropsychiatric disorders

    LTE-Advanced Downlink Throughput Evaluation In The 3G And TV White Space Bands

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