Stability radii of positive linear Volterra–Stieltjes equations

AbstractWe study stability radii of linear Volterra–Stieltjes equations under multi-perturbations and affine perturbations. A lower and upper bound for the complex stability radius with respect to multi-perturbations are given. Furthermore, in some special cases concerning the structure matrices, the complex stability radius can precisely be computed via the associated transfer functions. Then, the class of positive linear Volterra–Stieltjes equations is studied in detail. It is shown that for this class, complex, real and positive stability radius under multi-perturbations or multi-affine perturbations coincide and can be computed by simple formulae expressed in terms of the system matrices. As direct consequences of the obtained results, we get some results on robust stability of positive linear integro-differential equations and of positive linear functional differential equations. To the best of our knowledge, most of the results of this paper are new

DETERMINATION OF VARIABLE LAW OF THE TURBULENT DIFFUSION PARAMETERS WITH TIME INTERVAL IN THE AIR ENVIRONMENT IN VIETNAM

Joint Research on Environmental Science and Technology for the Eart

Innovation and Export of Vietnam’s SME Sector

Innovation has long been considered an important factor for creating and maintaining the competitiveness of nations and firms. The relationship between innovation and exporting has been investigated for many countries. However, there is a paucity of research in Vietnam with respect to this issue. In this paper we examine whether innovation performed by Vietnam’s small and medium enterprises (SMEs) enhances their exporting likelihood. Using the recently released Vietnam Small and Medium Enterprise Survey 2005, we find that innovation as measured directly by ‘new products’, ‘new production process’ and ‘improvement of existing products’ are important determinants of exports by Vietnamese SMEs.Vietnam; Export; Innovation; Small and Medium Enterprise

Generalization of a Theorem of Clifford

We prove that the multiplicative monoid of principal ideals partially ordered by reverse inclusion, called the divisibility theory, of a Bezout ring R with one minimal prime ideal is a factor of the positive cone of a lattice-ordered abelian group by an appropriate filter if the localization of R at its minimal prime ideal is not a field. This result extends a classical result of Clifford (Am. J. Math. 76:631–646, 1954) saying that the divisibility theory of a valuation ring is a Rees factor of the positive cone of a totally ordered abelian group and suggests to modify Kaplansky’s (later disproved) conjecture (Fuchs and Salce, Mathematical Surveys and Monographs 84, 2001) as to whether a Bezout ring whose localization at every minimal prime ideal has at least three ideals is the factor of an appropriate Bezout domain. © 2015, Institute of Mathematics, Vietnam Academy of Science and Technology (VAST) and Springer Science+Business Media Singapore

Essays on cost and surplus sharing games and contest theory

This thesis contains three essays on cost and surplus-sharing games. In the first chapter, Lorenz comparison between increasing serial and Shapley value cost-sharing rule, I consider the cost-sharing problem using a cooperative approach and compare the Shapley value and the Moulin-Shenker’s (Increasing) serial rule in the Lorenz sense. The result allows me to provide the complete ordering in inequality among the four popular sharing rules: The average share, the Shapley value, the Increasing serial, and the Decreasing serial sharing rule. In the later two chapters, I study the Tullock contest, which is a different interpretation of the non-cooperative surplus sharing game with the average rule. My second chapter, Underperforming and Outperforming contestant: Who to support?, consider a repeated Tullock contest where the designer has the option to favour either the early winner or the loser in the subsequent round, aiming to maximise the total effort. In the later section of the chapter, the contest designer is granted the additional capability to determine the prize distribution between the two stages. My work focuses on the optimal biasing decision and allocation of prizes to achieve the highest level of effort. In the third chapter, Benefits of Intermediate Competition with Non-Monetary Incentive, the underlying assumption is that the designer places importance not only on the total effort invested in the contest but also on the contest’s selection accuracy. I focus on investigating the impact of introducing an intermediate stage with a non-monetary incentive on the contest’s performance in both dimensions. By analysing the contest from this perspective, my work provides insights into the potential advantages and enhancements that can be achieved through the inclusion of intermediate competition and non-monetary incentives

Public private partnership in sustainable tourism development in Trang An landscape complex : Ninh Binh in the context of climate change

The aim was to understand how rapid changes to Trang An through urbanization, tourism, and climate change, are affecting people’s well-being in Truong Yen Commune (Viet Nam). The paper examines the drivers of these changes, and assesses the adaptive capacity of residents, local governments, and the private sector. In an innovative arrangement, the Trang An tourism complex operates through a public-private partnership (PPP) between the Ninh Binh Provincial People’s Committee and the Xuan Truong Corporation, a private company. Local government plays a key role. Proactive comprehensive planning involving government, the private sector, and civil society can reduce environmental and social risks of tourism.The Social Sciences and Humanities Research Council (SSHRC)Thailand Environment Institute (TEI

CEO Duality and Performance of Not-For-Profit Hospitals

Depending on their needs for enhancing and sustaining their business and market values, some firms choose to operate with a corporate governance structure of CEO duality, in which an executive serves as the CEO and the chairperson of the board of directors. The problem addressed in this study is that past empirical and theoretical studies of the relationship between CEO duality and firm performance of organizations across different industries have generated ambiguous results, and no studies have focused specifically on the relationship between CEO duality and financial performance of not-for-profit hospitals. Based on agency and stewardship theories, and considering that CEO duality\u27s effects on firms\u27 financial performance are contextually specific to each type of industry and dependent on certain industry conditions, the purpose of this quantitative study was to answer 3 research questions that examine the relationship between CEO duality, presence of physicians on governance board, hospital size, hospital age, board size, and financial performance of not-for-profit hospitals. This study used multiple regression analyses of data of financial indicators from 146 U.S. not-for-profit hospitals selected from the Office of Statewide Health Planning and Development database of California, for the period from 2009 to 2012. The results of this study suggested CEO duality and presence of physicians on healthcare governance were not related to financial performance of not-for-profit hospitals. The outcomes of this study can promote positive social change by bringing awareness of appropriate healthcare governance structures that enhance organizational effectiveness and sustain hospitals\u27 charitable missions of provision of community services and transformation of communities and society

Essays on corporate debt structure

This thesis discusses two aspects of debt structure and is divided into three essays. The first essay examines the decision of whether to use fixed- or floating-rate debt. The liquid and deep swap markets in most countries enable firms to issue any type of debt that is cheaper and then swap it into their preferred structure. If firms are hedging, then their choices of interest rate exposures should be driven by the sensitivity of their cash flows to interest rates. Alternatively, if firms are timing the market to reduce their cost of capital, then the selection of those exposures should be driven by the interest rate movements. The second essay attempts to determine what factors they consider to be important when firms use foreign currency debt. The currency debt mix is important for many firms and in particular multinationals, which generate some of their revenues in foreign currency and are therefore exposed to movements of currencies in which these revenues are denominated. Funding in currencies where the firm operates to hedge exposure is an alternative to the use of foreign currency derivatives. The third essay examines the relationship between the corporate use of interest rate swaps and the probability of default. This study attempts to answer the question of whether firms are hedging or speculating when using interest rate swaps. This thesis uses a large hand collected dataset of UK non-financial firms during the period from 1999 to 2015, which covers two distinct periods of contrasting economic fortune. The global 2007 financial crisis is an event that could affect the selection of interest rate and foreign exchange exposure of corporate debt. Previous studies have to manually make the adjustment to a firm’s pre-derivative debt structure to arrive at the net of derivative debt profile. In the UK, data is reported after the effect of derivatives. The data, therefore, is potentially more accurate than that employed by previous US studies. Additional data on the direction of interest rate and foreign currency swaps were also collected, which provides additional insight into debt structure and firm risk management

Optimization of Design Procedure for Column-base Connections according to EN 1993-1-8:2006

The stiffness and the strength of a column-base connection have significant impacts on the behavior of a steel frame. The paper develops an interaction curve between moment and axial force for the column-base connections according to EN 1993-1-8:2006 with the variation of the base plate thickness and the bolt diameter. This is the fundamental base to determine the ultimate strength of a column-base plate that allows the designers to estimate the strength of column-base connections. This research investigates the relationship between the base plate thickness, the bolt diameter, and the moment strength of the column-base plate with a specific axial force to select an optimum solution. Also, the initial rotational stiffness is determined under a specific axial load and varied moments that satisfy the ultimate limit state. The relationship between moment–rotation is subsequently performed with the variation of the base plate thickness or the bolt diameter. The design procedure is proposed based on moment-axial force interaction curves and moment-rotation curves. This allows for optimizing the column-base connection from proper selections of base plate dimensions and bolt diameters