台灣自1990年代開始，政府解除利率管制並開放新銀行設立，使傳統放款業務獲利變差，銀行只好降低授信標準以取得更大的授信市場，但在總體經濟惡化推波助瀾下，企業及個人償債困難浮現，銀行呆帳劇增。政府遂發起了第一次金融改革，協助問題金融機構退出市場，並提供銀行合併及跨業經營的法律規範，期望銀行藉由多角化經營，能使獲利能力有所提升。本文利用縱橫斷面資料(panel data)結合時間序列及橫斷面資料的方式，分析1992年至2009年間台灣所有上市、櫃銀行，營業收入多角化對其績效及破產風險的影響，加入其他可能影響因素共同分析。最後，將研究期間由第一次金融改革(2000)為界，分析金改前後，多角化程度、銀行績效及破產風險有何差異。實證結果發現，銀行在擴展非利息收入業務的同時，亦帶來相當程度的風險，足以侵蝕多角化分散風險的效益，並增加銀行破產機率。另外，銀行規模愈大或成長速度愈快，愈能使獲利能力提升，並降低破產風險；台灣銀行業財務槓桿運用能力受到限制，權益資產比愈高，股東報酬率則愈低，但同時具有較佳的償債能力，可有效將低其破產可能。在金融改革前、後，因為非利息收入業務性質改變，使得非利息收入風險提高，雖使資產報酬率愈佳，但是銀行的破產風險也上升。因此，銀行經營者在追求多角化經營的同時，也應注意風險上的管理，而政府在開放新種業務時，亦應制訂相配合的法令措施，以免未蒙其利而先受其害。

近年由於消費型態改變，加上金融技術進步、消費貸款相關法令鬆綁與政府政策刺激消費，以消費者為導向之金融商品漸趨多元化，導致消費金融在全球蓬勃發展；而直接金融興起，使得銀行在企業融資活動中地位重要性不如從前，來自企業金融的收入也隨之受到影響，種種因素加深銀行轉向推展消費金融業務，尋求新的收入來源。台灣自1990中期後，消費金融從金融體系的邊緣性業務逐漸躍升居主要業務，以民國93年資料顯示，消費金融貸款已成為銀行第一大貸款業務。有鑑於無人針對消費金融各項主要業務對銀行績效之影響做一綜合性探討，本研究將先針對國內消費金融發展做一說明、探討，再使用Panel 模型針對主要消費金融業務對銀行績效影響做一探討。 研究發現如下: 一、國內消費金融規模逐漸擴大，以信用卡、現金卡放款、其他消費性 貸款業務成長最快，整體消費金融朝向無擔保信貸發展，傳統有擔保 之業務比重不若以往。 二、民營銀行在消費金融績效優於公營銀行，尤其是金控底下之子銀行， 由於具有通路與規模之利，在推展消金時成效較好。 三、研究期間，消費金融業務對銀行績效確實優於企業金融業務，其中以 房貸對於銀行整體績效貢獻可以同時兼顧收入與風險面，對於整體銀 行逾放比呈現負向顯著關係，收入面則呈現正向挹注效果；而現金卡 放款與信用卡循環信用對銀行收入呈現顯著正向挹注效果，兩項業 務之利率達到15%以上，卻也同時具有增加銀行逾放比效果，此現象 符合高風險高報酬；車貸方面則因積極運作銀行屬於少數，雖然仍與 銀行收入呈現正向關係，但此關聯性不是很鮮明。

本研究使用資料包絡分析法進行我國銀行業生產效率分析，並以彰化銀行作為個案對象，研究彰化銀行在不同經營者下的生產效率，以2001年至2016年我國30家銀行為樣本銀行，探究各年度彰化銀行相對全體銀行之生產效率與Malmquist生產力指數，結果顯示彰銀自行經營期間（2001年至2005年），其生產效率與生產力指數變動大，生產效率變動在三商銀中為唯一衰退；台新金經營彰銀期間（2006年至2014年），彰銀生產效率曾連續五年為三商銀中最佳，直至後半期第一銀行生產效率超越彰銀成為三商銀中第一，因此生產力指數一銀略高於彰銀，唯生產效率進步程度由彰銀在三商銀中進步最多；而彰銀再度自行經營期間（2015年與2016年），彰銀連續兩年達生產效率，顯示其再度自行經營之生產效率相較其他銀行良好。 / This study investigates the productive efficiency of banks in Taiwan by using the Data Envelopment Analysis (DEA). This thesis also presents a case study about the transfered right of management of Chang-Hua Bank, to see the difference of productive efficiency between different managers. The study chooses 30 banks of Taiwan from 2001 to 2016 as the sample data, and studies the productive efficiency and Malmquist index of Chang-Hua Bank each year. The study shows the results as follows: 1. The government managed the Chang-Hua bank (2001~2005): It appears a great fluctuation of the productive efficiency and the Malmquist Index of Chang-Hua Bank. Among the Chang-Hua Bank, the First Bank and the Hua-Nan Bank, the Chang-Hua Bank presents the lowest average efficient change. 2. Taishin financial holding company managed the Chang-Hua bank (2006~2014): Comparing to the First Bank and the Hua-Nan Bank, Chang-Hua bank had been the most productive and efficient bank for five years. 3. The government managed the Chang-Hua bank (2015~2016): Chang-Hua Bank has reached the productive efficieny for the recent two years.

目前對於女性董事與財務績效的研究，以國外的文獻居多，台灣的研究僅有3篇，皆是以複迴歸的方式來進行研究分析，僅有一篇是針對金融業進行研究。未來全球經濟的發展，將隨著女性職場上參與程度和社經能力的提升而有所改變。而銀行業對經濟發展有密不可分的關係，故本研究以臺灣21間上市銀行2006年至2011年間的追蹤資料（即126筆樣本觀察值）來進行實證研究。採資料包絡分析法評估績效後，再以Tobit迴歸模型探討女性董監事的比例對台灣上市銀行經營績效的影響，並加入可能影響銀行經營績效的因素作為解釋變數，包括：資本適足率、逾放比率、銀行規模、政府持股比率、銀行是否加入金控、以及時間變數等因素。實證結果發現，女性董事的比例對於銀行的經營績效在統計上有負向的影響，而女性監察人的比例則沒有顯著的影響。建議末來可繼續研究女性董監事與其它產業的績效關係，以增加女性董監事與台灣產業間之關聯性的研究。 / At present, the studies of female directors and financial performances are mostly in foreign documents, and there are only three studies from Taiwan which are based on multiple regression analysis approach of research; only one of those studies focus on financial industry. The global economic development in the future will be changed along with the level of female participation in the workplace and the enhancement of their socio-economic capabilities. Moreover, banking has a close and tight relationship with economic developments. Therefore, this study was based on the traceable data of 21 listed banks in Taiwan from 2006 to 2011 (i.e., 126 sample observations) to proceed the empirical research. After adopting data envelopment analysis to evaluate the performances, it used tobit censored regression model to discuss the influence of the operational performance of listed banks in Taiwan along with the proportion of female directors and supervisors. It also added the possible factors that may affect the banks’ performance as explanatory variables including Capital Adequacy ratio, Non-Performing Loans ratio, size of banks, Public Shareholding ratio, joining in financial holding, time variables and other factors. The result of the study showed that statistically there is a negative effect to the operational performance of the banks along with the proportion of female directors; however, there is no significant impact affected by the proportion of female supervisors. In the future it suggested that the study can be continued researching about the influence of the operational performances in other industries by the proportion of female directors and supervisors in order to increase the research of the correlation between female directors/supervisors and industry performance in Taiwan.

【第一篇論文中文摘要】 集中度風險於結構式商品的量化與分析：以房屋抵押貸款證券為例 "Martin and Wilde (2002)與Gordy (2003)" 針對巴塞爾協定(Basel Accords)中金融機構之投資組合所內藴之集中度風險提出了相對應的微粒化調整(Granularity Adjustment)風險量化準則，然而該模型僅止於單因子架構下探究單一信用標的集中度風險之量化。本文將其架構延用至結構式商品中，允許債權群組內之信用標的具不同區域別，我們採用Hull and White(2010)之跨池違約相關性描述，並結合Pykhtin (2004)中延拓單因子聯繫模型至多因子之方式，進而求取債權群組之單一資產集中度(Name Concentration)與區域類別集中度(Sector Concentration)風險的量化。本文以房屋抵押貸款證券(Mortgage Backed Securities, MBSs)為例，於集中度風險的考量下，藉由檢視不同風險情境下分券之損失起賠點，重新評估房屋抵押貸款證券AAA投資級分券信用評級之合理性。研究結果顯示，AAA評等之分券高度曝險於系統性風險，且於高風險情境下，標的房貸之區域集中現象擴大了違約相關性對債權群組損失分配的影響，致使AAA分券之損失起賠點得以超過其實際擔保額度(subordination)範圍。 【第二篇論文中文摘要】 美國銀行放款多角化對其報酬與風險之影響：相關性與傳染的觀點 本文目的在於分析銀行放款的多角化行為對其報酬與風險之影響。研究發現納入銀行放款投資組合相關性之考量，亦即標的資產之相關性結構以及資產間因契約關係所隱含跨投資組合之傳染途徑，將降低多角化之成效。文中透過因子模型(factor model)建構資產之報酬，同時決定其相關性結構，其中將資產間殘差項相關性作為傳染指標，進一步分析投資組合內標的資產間的平均相關係數、傳染與多角化程度間的關聯性。我們以美國銀行作為研究樣本，分別以赫芬達-赫希曼指數估算投資組合權重分配之集中度、使用組合內標的產業股票報酬資訊來計算投資組合內相關程度，接著利用標的產業與投資組合外產業間的殘差相關性來捕捉產業傳染效果，將此三項指標作為衡量多角化指標，分析其在1987年至2014年間聯貸投資組合多角化情形並試圖分析放款多角化對銀行績效之影響。透過契約關係的界定進而探討顧客傳染如何影響銀行績效。 研究發現於市場處於平穩期間(tranquil period)，所有多角化指標銀行放款均呈現放款多角化程度越高越有助於提高銀行的報酬並降低其風險。然而於危機期間(turmoil period)，銀行應將放款權重集中於部分產業、建構相關性較低之組合或選擇較低之傳染效果之產業作為放款的對象，用以提高銀行績效。隱含在危機期間銀行應該選擇適度之多角化策略，若僅以赫芬達-赫希曼指數作為多角化之衡量將顯示危機期間越集中越有助於銀行的表現，此舉將造成解釋上的偏誤。說明於投資組合多角化的衡量上，不該忽略由相關性結構所引發之集中度風險。 / 【Essay I】 Quantification and Analysis of Concentration Risk in Structured Products: the Case of Mortgage Backed Securities Granularity adjustments, introduced by Martin and While (2002) and Gordy (2003), allow one to quantify the concentration exposures of credit portfolios due to imperfect diversification. However, they focus solely on name concentrations under an Asymptotic Single Risk Factor (ASRF) framework. In this study, by adapting the multi-pool correlation structure of Hull and White (2010) under the multi-factor setting of Pykhtin (2004), we derive quantitative measures of name and sector concentration that facilitate subsequent analysis of the risk profiles embedded in Mortgage Backed Securities (MBSs). Under different stress scenarios, we examine the impacts of concentration exposures on the internal credit enhancements, in particular, the AAA tranche attachment points. We show that, under severe market conditions, the presence of sector concentrations in the underlying mortgage pools can further amplify the effects of default correlation on the portfolio loss distributions. As a direct consequence, the predetermined subordination level determined by the assignment of tranche attachment points can be exceeded. 【Essay II】 How Loan Portfolio Diversification Affects U.S. Banks’ Return and Risk: Correlation and Contagion Perspectives. In this paper we investigate how loan portfolio diversification affects the banks’ return and risk. We argue that, the dependence structure of bank loan portfolios, namely, the correlation structure among loan assets and the presence of contagion channels due to contractual relationships across the border of portfolio, contributes to the costs of diversification. Under the factor model framework, we derive a theoretical model to depict the asset returns and their dependence structure. Based on data of US bank loans collected from 1987-2014, our empirical study employs HHI, intra-portfolio correlation, and contagion as proxies for diversification to examine how loan portfolio diversification affects the banks’ profitability and riskiness. In addition, contractual relationships are identified and we investigate how customer contagion affects the bank’s performance. We find that all diversification measures exhibit a positive effect on the performance of U.S. banks during tranquil periods. However, for turmoil periods, banks with loan portfolios of more concentrated weight distributions, lower intra-portfolio correlation, or lower consumer contagion effects would have improved returns and reduced risk. In other words, during crisis, banks should choose an appropriate concentration strategy rather than focus on selected industries as determined solely by the HHI.