• Refine Query
  • Source
  • Publication year
  • to
  • Language
  • 129
  • 51
  • 5
  • 5
  • 5
  • 5
  • 5
  • 5
  • 5
  • 4
  • 4
  • 3
  • 3
  • 3
  • 2
  • Tagged with
  • 254
  • 115
  • 34
  • 32
  • 31
  • 28
  • 27
  • 27
  • 26
  • 24
  • 23
  • 23
  • 23
  • 22
  • 21
  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
201

具有違約風險證券之最適投資組合策略 / Optimal Portfolios with Default Risks ─ A Firm Value Approach

陳震寰, Chen, Jen-Huan Unknown Date (has links)
關於Merton (1969) 最適投資組合策略問題,所考慮之投資情境為:一個將其財富資金安排配置於風險性資產(各類證券)與無風險短期現金部位之投資人,在給定此投資人心目中財富效用函數之前提下,希望事先決定出投資組合之最適投資權重(策略),藉此達成在投資期滿時極大化財富效用之期望值。基於Merton (1974) 公司價值觀點,具有違約風險之證券(公司債與股票)乃是公司價值之衍生性商品,無法以傳統資產配置對股票與債券部位採取現貨方式處理最適投資策略,在此必需同時結合財務工程處理衍生性金融商品計價與避險之技術來解決。本研究利用Kron & Kraft (2003) 彈性求解法來針對市場是否有投資限制、債券提前違約、到期違約及利率隨機與否等假設,基於不同投資組合情境分析來最適投資部位策略。本研貢獻和究創新突破之處在於特別探討公司違約時,債券投資人不再享有全部公司殘值之求償權,此時股東亦享有部份比例之求償權,違約後之公司殘值將由債券投資人與股東兩者比例共分之特殊情境下,對數型態財富效用之投資人對於提前違約風險之接受度高於到期違約風險,若一般情境(股東無任何求償權)則為相反。此外亦特別提供最適成長投資組合之動態避險策略封閉解,藉以提供投資人面臨企業違約風險時應制定之投資決策與動態調整,使本研究臻至週延與實用。 / Under the Merton (1969) optimal portfolio problem, we only consider the specific investor, whose wealth utility follows the type of logarithm function; wants to maximize the expected value of the terminal wealth utility through determine the optimal investment strategy in advance. He divides his wealth into the riskless asset and risky assets such as the money market account and the various-risky securities issued by the corporate. Based on the Merton firm value framework (1974), the defaultable securities, such as the corporate bonds and stocks, are the derivatives instruments of the firm value. It will be inappropriate if we deal with this optimal portfolio problem under the original methods. Therefore, we need to handle this optimal asset allocation problem through the pricing, valuation and hedging techniques from the financial engineering simultaneously. This study apply the elasticity approach to portfolio optimization (EAPO, Kraft ,2003) to solve the optimal portfolio strategy under various scenarios, such as the market contains the investment constrain or not, intermediate default risks, mature default risk, interest rate risky under the stochastic process. The innovation and contribution of this paper are especially breaking the common setting and analysis the optimal-growth-portfolio strategy under the special scenario. In the common setting, as soon as the default event occurs, the residual firm value will be claimed by the corporate bondholders with fully proportion and the stockholder cannot share any residual value. Oppositely, the stockholder will be able to share the residual firm value proportionally with the corporate bondholder together under the so-called special scenario. We found that the investor would have higher acceptance of the premature default risk than the mature default risk in the special scenario. This phenomenon will be reversed under the common scenario. Furthermore, in order to make this study more completely and useful, we do not only illustrate the optimal investment strategy but also provide the closed-formed solution of the dynamic hedge strategy of the risky position, composed by the defaultable securities. This could help the optimal-growth-portfolio-oriented investor to make investment decision while they face the firm value downward decreasing.
202

Introducing portfolio assessment as an alternative assessment method in the Department of Biomedical Technology at Mangosuthu Technikon : the perceptions of staff and students.

January 2008 (has links)
The assessment procedures utilized in the Department of Biomedical Technology at Mangosuthu Technikon were critically reviewed. This revealed a rather narrow approach with an emphasis on traditional assessment methods such as tests and examinations that provide limited feedback that does not necessarily determine whether learning has taken place. This study was prompted by the realization that the existing traditional methods of assessment promote or encourage a surface approach to learning which makes it difficult for the students to transfer the theoretical knowledge that they have attained into the practical performance that is required in the workplace. The study was conducted over a period of four years using an action research approach, which revolved mainly around the use of the existing assessment methods and an evaluation of the participants’ perceptions regarding the introduction of portfolio assessment in the Department of Biomedical Technology at Mangosuthu Technikon. During the study a group of students in the Department of Chemical Pathology was exposed to an in-course portfolio assessment as well as an experiential training portfolio assessment. A number of variables in the in-course portfolio assessment was tested. These variables were related to the concerns raised in the workplace. The introduction of the in-course portfolio showed some improvement in the way students performed their basic duties in 2005. The 2006 group of students was not exposed to the in-course portfolio assessment therefore this provided a better comparison of students by the employers. The study also involved the lecturers in the department who had different opinions regarding portfolio assessment. It was found that some of them supported the idea whereas others felt that the time allocated for lecturers’ duties did not permit them to introduce such a time-consuming assessment format. Employers involved in the study clearly indicated which areas or skills students needed to develop before they could come to the workplace for experiential training. However, the researcher concluded that some of those skills could be accumulated with further years of work experience. The study revealed that a significant portion of the students realized that, by integrating assessment in the learning process, they are able to be more critical of their own work, thereby putting more effort into understanding what they learn through the use of formative assessment. This in turn should pave the way for students to understand that learning is no longer teacher-centred, but learner-centred. This approach means that they are expected to work in more reflective and independent ways in the future. The study highlighted a number of issues that need to be addressed in assessment strategies. The lecturers were accustomed to assessment system that was time-efficient and yielded the scores required by the system. However, the way this assessment system related to learning was not so clear to either lecturers or students. Particularly, students felt that a mark did not necessarily reflect what they knew about the subject matter. They argued that if the same subject content had been assessed in other ways, a different performance outcome might have been achieved. This means that the actual awarding of marks is an intimidating process for some students and that ways should be found to render assessment less intimidating or threatening. A critical finding of the study is that assessment requires not only a high level of critical reflection, but also active engagement and discipline-specific knowledge by the lecturers to make the necessary changes for an assessment method where students’ learning is the centre of focus. / Thesis (M.Ed.) - University of KwaZulu-Natal, Pietermaritzburg, 2008.
203

不良資產投資組合之分析

洪式韻, Hung , Shih-Yun Unknown Date (has links)
我國金融機構合併法第十五條,允許資產管理公司以整包、群組化的方式處理不良資產。本文即以現代投資組合理論(MPT)為基礎,探討不良資產中有關不動產組合的類型、區位與價格規模對不動產組合效率的影響。相較傳統應用於金融資產的投資組合概念,本文主要特色是:根據「風險分散」的原理,不動產投資組合以國內地理區分散、類型分散的投資組合方式為主。在不動產的投資組合運用上,由於不動產市場的資訊不透明、缺乏流動性、高昂的交易成本,特別是不動產間的產品高度異質性,影響投資者運用「縱斷面」時間序列的不動產價格資料,分析不動產組合報酬與風險之結果,因此本篇研究改從「橫斷面」的角度,將不良資產價格資料進行個體不動產的組合模擬。實證的結果發現:(1)不動產組合價格與報酬風險呈現非線性的關係;當不動產組合金額愈大或愈小時,越有可能形成效率的投資組合;若組合中的不動產具有強烈的異質性,則小規模的不動產組合,即可達到效率組合的要求。(2)個體不動產組合內容異質程度愈高,亦可達到與傳統財務投資組合理論相同的分散風險效果。(3)個體不動產異質程度方面,不動產在「區位」多角化後之組合效率,其效果高過於不動產在「類型」多角化後之組合效率。
204

An analysis of monetary policy transmission through bond yields

Lloyd, Simon Phillip January 2017 (has links)
In this thesis, I study the transmission of monetary policy through the term structure of interest rates. This is an important topic because, with short-term nominal interest rates in many advanced economies close to their effective lower bound since 2008-2009, central banks have used `unconventional' monetary policies, such as large-scale asset purchases and forward guidance, to stimulate macroeconomic activity by, inter alia, placing downward pressure on longer-term interest rates. I focus on the mechanisms through which monetary policy influences bond yields, domestically and globally, with reference to a canonical decomposition of longer-term interest rates into expectations of future short-term interest rates, and term premia. After an introduction in chapter 1, chapter 2 appraises the use of overnight indexed swap (OIS) rates as measures of expected future monetary policy. Unlike federal funds futures (FFFs), which have regularly been used to construct measures of US interest rate expectations, OIS rates are available in many countries. I find that US OIS rates provide measures of interest rate expectations that are as good as those from FFFs, and that US, UK, Eurozone and Japanese OIS rates up to a 2-year horizon tend to accurately measure interest rate expectations, providing comparable cross-country measures of monetary policy expectations. In chapter 3, I propose a novel method for estimating interest rate expectations and term premia at short and long-term horizons: a no-arbitrage Gaussian affine dynamic term structure model (GADTSM) augmented with OIS rates. Using 3 to 24-month OIS rates, the OIS-augmented model generates estimates of the expected path of short-term interest rates out to a 10-year horizon that closely correspond to those implied by FFFs rates and survey expectations, outperforming existing GADTSMs. I study the transmission of US unconventional monetary policies in chapter 4. Using the OIS-augmented GADTSM, I carry out an event study to demonstrate that US unconventional monetary policy announcements between November 2008 and April 2013 did significantly reduce US longer-term interest rates by affecting expectations and term premia. As a result of these declines, unconventional monetary policies aided US real economic outcomes. Using a structural vector autoregression, I show that changes in interest rate expectations, linked to monetary policy signalling, had more expansionary effects on US real economic outcomes than changes in term premia, associated with portfolio rebalancing. Chapter 5 assesses the international transmission of monetary policy through the term structure of interest rates between advanced economies. I present a micro-founded, two-country model with endogenous portfolio choice amongst country-specific short and long-term bonds, and equity. Within the model, US monetary policy has sizeable effects on longer-term interest rates in other advanced economies, which are similar to empirical estimates. Using the OIS-augmented GADTSM in an event study, I show that US monetary policy has led to changes in interest rate expectations in other advanced economies that amplify global spillovers, which have been partly mitigated by changes in term premia through portfolio rebalancing.
205

Investigating the role of portfolios in developing reflective practice : a case study

Mbango, Karolina Naango January 2008 (has links)
The purpose of this study was to investigate the purpose and role portfolios are playing in developing reflective practice in student teachers and to assess the degree to which this role is being achieved in practice. This study was a interpretive small scale case study. The target groups were 3 student teachers in their final year of study, 3 teacher educators and the vice-rector of the college. Data were obtained through interviews and document analysis. The findings indicated that the students had no meaningful orientation to both the role of portfolio development and reflective skills. The sources of this were the lack of common understanding among teacher educators, lack of support for both teacher educators and student teachers and lack of time, lack of guidelines for construction and clear assessment rubric. The results of this study indicated that the teacher educators were in need of vigorous professional development and considerable implementation strategies are needed to develop the desired reflective skills.
206

Análise de desempenho e características de fundos de fundos multigestores do mercado Brasileiro no período de setembro/1998 a agosto/2007

Assali,Nicolau Alfredo 13 February 2008 (has links)
Made available in DSpace on 2010-04-20T21:00:30Z (GMT). No. of bitstreams: 4 nicolauassali.pdf.jpg: 21057 bytes, checksum: e49c3a73a969030bb30a7b487e8ddf77 (MD5) nicolauassali.pdf: 745103 bytes, checksum: dcb827d78438926dd042deccffc5bab4 (MD5) 1_136970.pdf: 745134 bytes, checksum: 17ea1cc72a370b8ea2ba2cf6590ebe16 (MD5) nicolauassali.pdf.txt: 258686 bytes, checksum: 416660ae630d51947f844cef8a94fb45 (MD5) Previous issue date: 2008-02-13T00:00:00Z / This dissertation analyses the performance and features of some of the current Brazilian funds of funds, called multimanagers, as well as the performance of funds of funds as a result of the simulation of Brazilian funds portfolios that use several investment strategies known as multimarkets. The diversification through a multimarkets funds portfolio involves other variables beyond the traditional approach of mean-variance. The first part of this study presents the main features of the selected funds of funds and also describes more than the mean-variance, showing the third and fourth moments of the returns distribution. The second part uses the tool named Style Analysis (Sharpe, 1988) in order to determine the return exposure of each of the funds of funds of the sample to certain asset classes. In this study were chosen the following asset classes: Ibovespa, CDI, Dollar and IRF-M. Through the medium-variance approach, the third part of this study uses a tool known as the Portfolio Theory (Markowitz, 1952) as the minimum variance frontier, in order to evaluate the performance of each funds of funds in the given sample. The performance is evaluated on the comparison basis of the minimum variance frontier built from a benchmark portfolio (comprising two of the major Brazilian financial assets of low and high risk: CDI and Ibovespa, respectively) with another minimum variance frontier built from the addition of a fund of funds into the benchmark portfolio. The last part refers to simulations of multimarkets portfolio funds that allow the allocation of variable income in the portfolio and it also allows the use of leverage. The goal is to check through the return of the average values, variance, asymmetry and kurtosis, the efficiency of such funds as instruments of diversification. The outcomes show that the 32 multimanager funds of funds analyzed do not have normal return distribution and 29 ones present negative skewness behavior. The Style Analysis indicates high sensibility to CDI and IRF-M, and low sensibility to Ibovespa and Dollar, main financial market indexes. The majority of multimanager funds of funds improved the Minimum Variance Frontier when added to a reference portfolio (CDI + Ibovespa), in other words, there was a reduction on risk – return relation. The portfolio simulation indicates that in the last three years the multimarkets funds classified as Leveraged Variable Income has been more aggressive in the strategies due to the asymmetry behavior; however this kurtosis behavior indicates a position not too aggressive as well. So the construction of Funds portfolios that use several investment strategies should not be restraint to the mean-variance approach. It should also involve asymmetry, kurtosis and investor preferences. / Esta dissertação analisa o desempenho e as características de uma parte dos atuais fundos de fundos brasileiros, os denominados multigestores, bem como o desempenho de fundos de fundos resultantes da simulação de carteiras de fundos brasileiros que utilizam várias estratégias de investimentos, conhecidos como multimercados. A diversificação através de uma carteira de fundos multimercados envolve outras variáveis além da tradicional abordagem de média-variância. A primeira parte do estudo apresenta as principais características dos fundos de fundos selecionados e descreve, além da média e variância, o terceiro e quarto momentos das distribuições dos retornos. A segunda parte utiliza a ferramenta chamada Análise de Estilo (Sharpe, 1988), para determinar a exposição dos retornos de cada um dos fundos de fundos da amostra a determinadas classes de ativos. Neste trabalho foram escolhidas as seguintes classes de ativos: Ibovespa, CDI, Dólar e IRF-M. Através da abordagem de média-variância, a terceira parte do estudo utiliza a ferramenta conhecida na Teoria da Carteira (Markowitz, 1952) como fronteira de mínima variância, para avaliar o desempenho de cada um dos fundos de fundos da amostra. O desempenho é avaliado com base na comparação da fronteira de mínima variância construída a partir de uma carteira de referência (composta por dois dos principais ativos financeiros brasileiros de baixo e alto risco: CDI e Ibovespa, respectivamente) com outra fronteira de mínima variância construída a partir do acréscimo de um fundo de fundos à carteira de referência. A última parte refere-se a simulações de carteiras de fundos multimercados que permitem a alocação de renda variável na carteira e também permitem o uso de alavancagem. Seu objetivo é verificar, através dos valores de retorno médio, variância, assimetria e curtose, a eficiência desses fundos como instrumentos de diversificação. Os resultados mostram que os 32 fundos de fundos multigestores analisados não tem distribuição normal de retornos e 29 apresentam assimetria negativa. A Análise de Estilo indica grande sensibilidade ao CDI e ao IRF-M, e pouca sensibilidade ao Ibovespa e Dólar, importantes índices do mercado financeiro. A maioria dos fundos de fundos multigestores melhorou a Fronteira Eficiente quando adicionados a uma carteira de referência (CDI + Ibovespa), ou seja, houve uma redução na relação risco-retorno. A simulação das carteiras indica que nos últimos três anos os fundos multimercados classificados como Com Renda Variável Com Alavancagem tem sido mais agressivos nas estratégias, devido ao comportamento da assimetria, porém o comportamento da curtose indica também uma posição nem tão agressiva. Logo, a construção de carteiras com fundos que utilizam diversas estratégias de investimentos não deve se restringir à abordagem de média-variância. Deve também envolver também assimetria, curtose e preferências do investidor.
207

Em busca de um índice alternativo à relação Book to Market para a construção de carteiras mais rentáveis / Searching for an alternative index from Book to Market for more profitable stock portfolio building

André Eugênio de Goes Monteiro Gaudio 11 March 2015 (has links)
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior / Muitos estudos buscam tentar prever o retorno potencial sobre portfólios de ações, com intuito de obter melhor rentabilidade sobre o capital aplicado. Diversas modelagens já foram utilizadas, sendo que as mais conhecidas são as que relacionam o risco com o retorno. Nesta linha destacam-se a Teoria de Carteiras proposta por Markowitz, e o CAPM de Sharpe. Através destas teorias entende-se a questão da influência da covariância dos retornos e que para um melhor desempenho de uma carteira, não é suficiente avaliar cada ativo individualmente. Por outro lado, diversas críticas em relação ao CAPM, vêm ensejando estudos complementares na busca de outras variáveis que melhorem os métodos de seleção de ativos. Fama e French (1993) fizeram um estudo com variáveis complementares em relação ao beta do CAPM, utilizando o tamanho e a relação Book to Market, conseguindo resultados melhores que o CAPM tradicional. O presente estudo leva em conta a questão do reinvestimento do lucro gerado e utilizando o modelo de Gordon propõe uma variável de classificação de empresas de crescimento e empresas valor, conceito já utilizado na literatura de finanças.Com base nesta variável montam-se carteiras de ações entre os anos de 2005 e 2012 e observa-se que é possível obter ganhos com a lógica proposta. Ao longo do período seria possível obter com as carteiras selecionadas ganhos de até 107,85% contra os retornos de 55,58% das carteiras com todos os ativos. Organizamos os mesmos ativos pela ótica da relação Book to Market as quais obtiveram retorno total do período de 90,42%. Apesar de notar uma mudança clara de comportamento, onde apenas nos quatro primeiros anos do estudo as carteiras com empresas value são superiores e nos quatro últimos períodos as carteiras de empresas growth são as melhores. Estes resultados são compatíveis com os resultados de Braga e Leal (2000), e Mescolin, Martinelli Braga e da Costa Jr. (1997), verificando um melhor desempenho para as empresas value. / Many studies have tried to predict the potential return on stock portfolios, aiming to get better return on invested capital. Several modeling have been used, and the more popular are those that relate the risk with the return. In this area, stand out the Portfolio Theory proposed by Markowitz and the CAPM proposed by Sharpe. Through these theories can be understood the influence of the covariance of returns, and for a best performance of a portfolio, is not enough to assess each individual asset. On the other hand, many criticism of the CAPM, have generating additional studies in search of other variables to improve the methods of selection of assets. Fama and French (1993) conducted a study with additional variables in relation to the CAPM beta, using the size and the relationship Book to Market, achieving better results than the traditional CAPM. This study considers the issue of the generated profit reinvestment, and using the model of Gordon proposes a classification variable for growth companies and value companies, which are concepts already used in finance literature. Based on this variable are set up stock portfolios between the years 2005 and 2012 and it is observed that it is possible to get earnings with the logic proposed. Over the period could be obtained with the selected portfolios up to 107.85% gains against the returns of 55.58% of the complete portfolio with all assets. We organize the same stocks from the perspective of the relationship Book to Market which had a total return of 90.42% on the whole period. Although observed a clear change of behavior, where only the first four years of the study portfolios with value companies are superior and the last four years portfolios of growth companies are the best. These results are consistent with the results of Braga and Leal (2000), and Mescolin Martinelli Braga and Costa Jr. (1997), watching a better performance for value companies.
208

Em busca de um índice alternativo à relação Book to Market para a construção de carteiras mais rentáveis / Searching for an alternative index from Book to Market for more profitable stock portfolio building

André Eugênio de Goes Monteiro Gaudio 11 March 2015 (has links)
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior / Muitos estudos buscam tentar prever o retorno potencial sobre portfólios de ações, com intuito de obter melhor rentabilidade sobre o capital aplicado. Diversas modelagens já foram utilizadas, sendo que as mais conhecidas são as que relacionam o risco com o retorno. Nesta linha destacam-se a Teoria de Carteiras proposta por Markowitz, e o CAPM de Sharpe. Através destas teorias entende-se a questão da influência da covariância dos retornos e que para um melhor desempenho de uma carteira, não é suficiente avaliar cada ativo individualmente. Por outro lado, diversas críticas em relação ao CAPM, vêm ensejando estudos complementares na busca de outras variáveis que melhorem os métodos de seleção de ativos. Fama e French (1993) fizeram um estudo com variáveis complementares em relação ao beta do CAPM, utilizando o tamanho e a relação Book to Market, conseguindo resultados melhores que o CAPM tradicional. O presente estudo leva em conta a questão do reinvestimento do lucro gerado e utilizando o modelo de Gordon propõe uma variável de classificação de empresas de crescimento e empresas valor, conceito já utilizado na literatura de finanças.Com base nesta variável montam-se carteiras de ações entre os anos de 2005 e 2012 e observa-se que é possível obter ganhos com a lógica proposta. Ao longo do período seria possível obter com as carteiras selecionadas ganhos de até 107,85% contra os retornos de 55,58% das carteiras com todos os ativos. Organizamos os mesmos ativos pela ótica da relação Book to Market as quais obtiveram retorno total do período de 90,42%. Apesar de notar uma mudança clara de comportamento, onde apenas nos quatro primeiros anos do estudo as carteiras com empresas value são superiores e nos quatro últimos períodos as carteiras de empresas growth são as melhores. Estes resultados são compatíveis com os resultados de Braga e Leal (2000), e Mescolin, Martinelli Braga e da Costa Jr. (1997), verificando um melhor desempenho para as empresas value. / Many studies have tried to predict the potential return on stock portfolios, aiming to get better return on invested capital. Several modeling have been used, and the more popular are those that relate the risk with the return. In this area, stand out the Portfolio Theory proposed by Markowitz and the CAPM proposed by Sharpe. Through these theories can be understood the influence of the covariance of returns, and for a best performance of a portfolio, is not enough to assess each individual asset. On the other hand, many criticism of the CAPM, have generating additional studies in search of other variables to improve the methods of selection of assets. Fama and French (1993) conducted a study with additional variables in relation to the CAPM beta, using the size and the relationship Book to Market, achieving better results than the traditional CAPM. This study considers the issue of the generated profit reinvestment, and using the model of Gordon proposes a classification variable for growth companies and value companies, which are concepts already used in finance literature. Based on this variable are set up stock portfolios between the years 2005 and 2012 and it is observed that it is possible to get earnings with the logic proposed. Over the period could be obtained with the selected portfolios up to 107.85% gains against the returns of 55.58% of the complete portfolio with all assets. We organize the same stocks from the perspective of the relationship Book to Market which had a total return of 90.42% on the whole period. Although observed a clear change of behavior, where only the first four years of the study portfolios with value companies are superior and the last four years portfolios of growth companies are the best. These results are consistent with the results of Braga and Leal (2000), and Mescolin Martinelli Braga and Costa Jr. (1997), watching a better performance for value companies.
209

CARTEIRAS DE MÃNIMA VARIÃNCIA: COMPARAÃÃO INTERTEMPORAL COM ÃNDICES DE MERCADO. / MINIMUM VARIANCE PORTFOLIO : COMPARISON WITH intertemporal MARKET INDICES

Daniel Menezes Cavalcante 28 August 2013 (has links)
nÃo hà / Quando a conjuntura econÃmica de um paÃs propicia baixa taxa de juros de mercado, a rentabilidade de aplicaÃÃes ditas seguras, como em renda fixa, deixa de ser negÃcio atrativo para investidores, que optam por submeter-se a um risco maior em busca de maiores rendimentos. Em tais cenÃrios, investidores arriscam-se no mercado acionÃrio, no qual ganhos maiores podem ser auferidos, apesar do risco superior ao da renda fixa. A Teoria Moderna do PortfÃlio mostra que esse risco pode ser reduzido pela diversificaÃÃo de ativos. Esta pesquisa tem por objetivo verificar se um modelo quantitativo baseado na Teoria Moderna do PortfÃlio à capaz ajudar na diversificaÃÃo de um portfÃlio, reduzindo risco a nÃveis inferiores aos da carteira de mercado, enquanto proporciona rendimentos superiores aos de s de mercado. Os testes utilizaram sÃries histÃricas de 36 ativos negociados na BOVESPA entre 1999 e 2012, e foram conduzidos em janelas de amostras de 12, 36, 60 e 120 observaÃÃes. Os resultados mostram que a ampliaÃÃo do horizonte de investimento permite a obtenÃÃo de desempenho superior do portfÃlio selecionado pela otimizaÃÃo baseada na mÃnima variÃncia, comparativamente à aplicaÃÃo livre de risco (CDI) e ao Ãndice Bovespa.
210

Proposta de um arcabouço analítico na perspectiva institucional para avaliar as implicações dos PAs para o desempenho em inovação de empresas multinacionais em países emergentes: foco no setor automobilístico / Model for analyzing from an institutional perspective firm alliance portfolios´ implications for innovation performance: focus automotive sector

Porto, Clarice Breviglieri 13 December 2016 (has links)
Submitted by Renata Lopes (renatasil82@gmail.com) on 2018-08-06T11:16:46Z No. of bitstreams: 1 claricebreviglieriporto.pdf: 6344933 bytes, checksum: da5f358d5bfa14a39f003088a9bedc33 (MD5) / Approved for entry into archive by Adriana Oliveira (adriana.oliveira@ufjf.edu.br) on 2018-08-06T11:17:49Z (GMT) No. of bitstreams: 1 claricebreviglieriporto.pdf: 6344933 bytes, checksum: da5f358d5bfa14a39f003088a9bedc33 (MD5) / Made available in DSpace on 2018-08-06T11:17:49Z (GMT). No. of bitstreams: 1 claricebreviglieriporto.pdf: 6344933 bytes, checksum: da5f358d5bfa14a39f003088a9bedc33 (MD5) Previous issue date: 2016-12-13 / PROQUALI (UFJF) / As incertezas no mercado atual provenientes das turbulências ambientais e das relações altamente complexas e globalizadas levam as empresas multinacionais a estabelecerem múltiplas alianças para sustentar sua vantagem competitiva. Essas múltiplas alianças se constituem em redes ou portfólios de alianças. Simultaneamente, surge como imperativo a capacidade de inovar para assegurar um melhor diferencial competitivo, levando as empresas a adotar estratégias orientadas à inovação. A indústria automobilística mundial é caracterizada por grandes avanços tecnológicos e representa muito bem as novas formas de relacionamento e operação entre empresas respondentes de uma mesma rede de relacionamentos, inclusive alianças. A gestão da cadeia de fornecedores por meio desses novos arranjos organizacionais é representativa de inovações no setor onde as empresas buscam maior competitividade. As montadoras, empresas multinacionais, dependem do conhecimento dos seus parceiros para desenvolver e entregar produtos inovadores aos consumidores, sendo necessário então, compartilhar informações, recursos, produtos e serviços em todo o portfólio/redes de alianças. Para que esse fluxo ocorra da melhor forma é necessário que a empresa desenvolva a estrutura de governança e a capacidade de aprendizagem. As multinacionais da indústria automobilística são empresas globais, que atuam em diferentes países e estão sujeitas a diferentes pressões institucionais. Para manter sua vantagem competitiva, as empresas precisam compreender e seguir as normas locais, identificando os mecanismos institucionais. Por ser um setor constituído por portfólios de alianças a indústria automobilística possui uma forte cadeia econômica que tem impacto sobre o sistema econômico e social do país, tornando-se responsável por um grande número de empregos, arrecadação tributária e aquecimento do mercado de crédito. A partir desse cenário o objetivo final da pesquisa desenvolvida é: Propor um arcabouço analítico que possa auxiliar os executivos de empresas multinacionais em países emergentes, do setor automobilístico, orientadas estrategicamente à inovação, na análise e no gerenciamento dos seus portfólios de alianças com vistas a contribuir para o desempenho em inovação, considerando suas especificidades institucionais. Para atingir o objetivo foi realizada uma revisão da literatura abrangendo as principais teorias relacionadas ao tema: a teoria das redes, a institucional e a dos portfólios de aliança procurando verificar o impacto dessas no desempenho em inovação das empresas multinacionais. O arcabouço proposto é uma variação do modelo SNA – IF de Macedo-Soares (2015) onde foram acrescentados indicadores relativos ao contexto institucional e específicos ao caso de empresas multinacionais do setor automobilístico em países emergentes. O método adotado foi do estudo de caso múltiplo, envolvendo duas montadoras multinacionais instaladas no Brasil. Para a escolha das montadoras foi feita uma análise dos grupos estratégicos, utilizando a análise de fator, onde se identificou três grupos distintos. Para o estudo de caso foi escolhido uma empresa de cada um dos dois grupos mais relevantes. Utilizando-se de múltiplas fontes de evidências, como a análise documental e a análise dos questionários estruturados, se consolidou o arcabouço SNA – IF_Institution Version. Os resultados da pesquisa empírica comprovaram a adequação da aplicação do arcabouço SNA – IF_Institution Version no sentido de prover elementos que possam auxiliar os executivos das empresas do setor automobilísticos na análise e no gerenciamento dos seus portfólios de alianças com vistas a contribuir para o desempenho em inovação, face suas especificidades institucionais. / The uncertainties in the current market stemming from environmental turbulences and highly globalized and complex relations make multinational companies establish multiple alliances to support their competitive advantage. These multiple alliances are made up of networks or alliances. Simultaneously, the capacity to innovate becomes imperative, so as to assure a competitive differential, enabling companies to adopt innovation-oriented strategies. The world auto industry is characterized by great technological advances and successfully represents the new ways of relationship and operation between companies taking part in the same relationship network, including alliances. The management of the supply chain through these new organizational arrangements is representative of innovations in the sector where companies seek more competitiveness. The car companies, which are multinationals, depend on the expertise of their partners to develop and deliver innovative products to consumers, thus rendering it necessary to share information, resources, products and services in the entire portfolio/alliance network. In order for this flow to happen in the best way possible, it is necessary that the company develop the structure for governance and the capacity to learn. Multinationals of the auto industry are global companies, which are present in several different countries and are subject to different institutional pressures. So as to keep their competitive advantage, companies must comprehend and follow the local norms, identifying institutional mechanisms. Since it is a sector made up of alliance portfolios, the industry has a strong economic chain that has impact on the social and economic systems of the country, becoming responsible for a large number of jobs, tax collection and the strengthening of the credit market.From this scenario, the final objective of the research developed is: To propose an analytical framework which can help executives from multinational companies in emerging countries, from the auto sector, strategically guided to innovation, to analyse and to manage their alliance portfolios aiming to contribute for the performance in innovation, considering their institutional specificities. To reach such goal, a literary review encompassing the main theories related to the theme was conducted: The theories of networks, the institutional and that of alliance portfolios aiming to verify their impact on the innovation performance of multinational companies.The proposed framework is a variation of the SNA-IF model from Macedo-Soares (2015) to which we added indicators related with the institutional context and specific to the case of multinational companies from the auto industry in emerging countries. The adopted method was the multiple case study, involving two international car companies with factories in Brazil. To choose them, an analysis of the strategic groups was carried out, using the factor analysis, in which three groups were identified. For the case study, one company from each of the two more relevant groups was chosen. Using multiple sources of evidence, such as documental analysis and an examination of structured questionnaires, the SNA-IF_Institution Version framework was consolidated. The results from the empirical research prove the adequacy of applying the SNA-IF_Institution Version framework in order to provide elements that can help executives from the auto industry to analyze and manage their portfolios of alliances so as to contribute to the innovation performance, in face of their institutional specificities.

Page generated in 0.0339 seconds