1,720,958 research outputs found
Elementi di Matematica Finanziaria per le Scienze Economiche, Giuridiche e Aziendali
No full textQuesto lavoro nasce dal desiderio di offrire a chi affronta lo studio della matematica finanziaria una trattazione agevole e per quanto possibile completa dei diversi tipi di operazioni finanziarie nella maniera in cui si svolgono nella realtà dei mercati finanziari.
Partendo dalle prime nozioni sui regimi finanziari, il testo af-fronta le più comuni operazioni finanziarie certe: le rendite; i prestiti, il loro rimborso e la loro valutazione; si conclude con gli strumenti che vengono utilizzati per la valutazione degli investimenti (tasso interno di rendimento, duration, payback e altri) e con un’introduzione al calcolo probabilistico. Questi argomenti sono sicuramente efficaci per meglio comprendere le nozioni che verranno affrontate dagli studenti nei corsi degli anni successivi al primo, in cui si sostiene l’esame di matematica finanziaria, cioè la finanza aziendale e la tecnica bancaria, per citarne alcuni.
Alla fine di ogni capitolo è anzitutto presente una serie di eser-cizi svolti e commentati che ulteriormente approfondiscono la teoria presentata nel testo; vengono poi proposti altri problemi, per consentire di esercitarsi personalmente nello studio della materia anche da un punto di vista operativo
Mathematics for Economists – Exercises, problems, models
No full textThis text was written for advanced undergraduate and beginners graduated students, as well as researchers who want to deepen their
knowledge in some mathematical methods very useful in the recent
economic literature (ordinary difference and differential equations, static
and dynamic optimizations). It has been made through the experience of
lecturing conducted teaching for many years in advanced courses in
Mathematics for Economists at the University of Cagliari, Department of
Economics and Business Science. The didactic format aims to present the
necessary theory recalls at the beginning of each chapter and then
proposes a series of exercises carried out, discussed, problems and
deepening of some topics through a lot of economic applications. So the
text follows the style of the lectures. It starts with some preliminary topics
(geometry, algebra and mathematical analysis) and then it deals with
ordinary difference and differential equations and some tools for static
and dynamic optimization of functions of one and several variables. The
readers have the chance to strengthen and deepen their preparation in
the mathematical topics, through the exercises and problems proposed
Esercizi e problemi di Geometria e Algebra lineare
No full textLa riforma degli studî universitarî e la conseguente scansione
semestrale dei corsi, in vigore ormai da diversi anni, hanno reso necessario
affiancare alle lezioni un’adeguata opera di tutorato. Ciò è vero
per ogni corso e, in particolare, per quelli destinati alle matricole.
L’obiettivo degli incontri di tutorato è di evitare che lo studente,
nel prepararsi agli esami, faccia prevalere gli aspetti pratici della
materia a discapito del necessario approfondimento teorico: ciò può
accadere sia per l’oggettiva difficoltà di assimilare rapidamente i concetti
di base, sia per l’esiguo tempo a disposizione nel preparare i diversi
esami.
Come è noto, privilegiare il “saper fare” sul “sapere” è una
tendenza generale in atto nel mondo accademico, non solo italiano, e
ciò rappresenta un segno di impoverimento degli studi che tocca anche
i più alti gradi dell’insegnamento. Purtroppo si stanno delineando gli
inconvenienti della riforma: l’Università non è più il culmine della
struttura dell’istruzione, ma una tappa obbligata verso la specializzazione
post lauream e si assiste a un generale livellamento verso il basso
della qualità del corpo studentesco.
Questo testo è un lavoro abbastanza originale, non tanto nel
contenuto quanto nel formato didattico. Esso è il frutto dell’esperienza
del tutorato di Geometria e Algebra lineare condotto negli ultimi anni
nella Facoltà di Ingegneria dell’Università di Cagliari e si rivolge agli
studenti presentando anzitutto i necessarî richiami di teoria all’inizio
di ogni capitolo e poi proponendo una serie di esercizî svolti e commentati.
Volutamente il testo ricalca lo stile del tutorato: non intende
sostituirsi ai manuali appositamente designati per prepararsi all’esame,
ma vuole essere uno strumento di agevole consultazione in vista della
prova scritta. Esso copre l’intero programma di geometria e algebra
svolto a lezione e può essere utilizzato “in parallelo” a ogni testo di
geometria. Inoltre, esso è operativo per lo studente che prepara
l’esame in quanto non è una semplice raccolta di esercitazioni, ma segue
un preciso percorso logico-didattico e usa una metodologia unitaria
proponendo numerosi esercizi introduttivi, di rinforzo e di approfondimento. Infine, esso permette allo studente di esplicitare le conclusioni
a cui perviene nello studio della disciplina
Sunspot in Economic Models with Externalities
No full textIn this paper, we consider a general class of endogenous growth two-sector models with externalities (see Mulligan and Sala-i- Martin, 1993, Venturi 2014): the model deals with the maximization of a standard utility function. Following Benhabib, Nishimura, and Shigoka, 2006, we construct cycles (Hopf cycles) and sunspots equilibria in a general class two-sector model. We are able to show that optimal control model with externalities possess stochastic characteristics which arise from indeterminate equilibrium closed to steady state and cycles (Hopf cycles) (see Chiappori and Guesnerie, 1991, Benhabib, Nishimura, and Shigoka, 2006. Slobodyan 2009). As applications of this general class of models, we consider the models due to Lucas, Romer, and Bella (a disposal natural resource model). In our formulation, the stochastic approach suggest a way out from the cycle trap (the poverty environments trap, see Slobodyan 2009)
Bifurcations and sunspots in continuous time optimal models with externalities
No full textIn this chapter, we construct sunspot equilibria in a class of continuous-time optimal control models with externalities. The model possesses stochastic characteristics which arise from indeterminate equilibrium and cycles (Hopf cycles) closed to the steady state. The model undergoes to Hopf bifurcations in some parameters set. We construct a stationary sunspot equilibrium near the closed orbit. We show that the stochastic approach suggests a way out from the poverty environments trap in a natural resource optimal model
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
- …
