An improved bound for the Gaussian concentration inequality

In this note, we provide an improved bound for the Gaussian concentration inequality. Our proof is short and bases on the integration-by-parts formula for the gaussian measure.Comment: 4 page

Gaussian lower bounds for the density via Malliavin calculus

In this paper, based on a known formula, we use a simple idea to get a new representation for the density of Malliavin differentiable random variables. This new representation is particularly useful for finding lower bounds for the density.Comment: To appear in Comptes Rendus Mathematique, 10 page

A multifunctional dynamic voltage restorer for power quality improvement

Power quality is a major concern in electrical power systems. The power quality disturbances such as sags, swells, harmonic distortion and other interruptions have an impact on the electrical devices and machines and in severe cases can cause serious damages. Therefore it is necessary to recognize and compensate all types of disturbances at an earliest time to ensure normal and efficient operation of the power system. To solve these problems, many types of power devices are used. At the present time, one of those devices, Dynamic Voltage Restorer (DVR) is the most efficient and effective device used in power distribution systems. In this paper, design and modeling of a new structure and a new control method of multifunctional DVRs for voltage quality correction are presented. The new control method was built in the stationary frame by combining Proportional Resonant controllers and Sequence-Decouple Resonant controllers. The performance of the device and this method under different conditions such as voltage swell, voltage sag due to symmetrical and unsymmetrical short circuit, starting of motors, and voltage distortion are described. Simulation result show the superior capability of the proposed DVR to improve power quality under different operating conditions and the effectiveness of the proposed method. The proposed new DVR controller is able to detect the voltage disturbances and control the converter to inject appropriate voltages independently for each phase and compensate to load voltage through three single-phase transformers.Web of Science116art. no. 135

“Living” Epics in Central Highland-Vietnam

This article is about h’mon, an epic genre of Bahnar ethnic in the Central Highlands of Vietnam. Typical of this epic type is H’mon Dam Giong (or The Dam Giong epics). The contents of this article include space and mode of performance of h’mon; characteristics of the “living epic” of h’mon (It is the ability to refresh the content of h’mon by adding new details); characteristics of the character system (including the central character and the re-appearing characters)

Factors Influencing Accounting Information Systems in Small and Medium Enterprises: The Case in Hanoi, Vietnam

Purpose: The study aims to identify the factors influencing the accounting information system in small and medium-sized enterprises in Hanoi, Vietnam.   Theoretical framework: The paper is based on the theoretical framework of factors affecting the accounting information system which has been done before and applied in small and medium-sized enterprises in Hanoi, Vietnam.   Design/methodology/approach: The questionnaire was distributed to 350 small and medium-sized enterprises in Hanoi, and a total of 245 valid responses were collected. They included directors, chief accountants, and accounting staff. By multivariate regression analysis from SPSS 22 software, the results indicate that there are five factors affecting the effectiveness of the accounting information system in small and medium-sized enterprises in Hanoi.   Findings: The regression findings support the significant positive impacts of these factors influencing the accounting information system in small and medium-sized enterprises in Hanoi as follows: (1) Managerial knowledge, (2) External expert support, (3) Organizational characteristics, (4) User participation in the system, and (5) Managerial support.   Research, Practical & Social implications: The study provides factors influencing the accounting information systems in small and medium-sized enterprises in the case of Hanoi, Vietnam. This result provides useful references for relevant issues. The research results are the basis for proposing solutions to improve the Accounting Information Systems in Vietnam for making decisions.   Originality/value: The value of the study is providing an expansion of the factors influencing accounting information systems. Research results provide useful references for research on related issues. These findings can be useful for Vietnamese enterprises to take measures to improve their Accounting Information Systems, thereby improving business performance