A Robust Control for Five-level Inverter Based on Integral Sliding Mode Control

This paper presents a new control strategy for cascaded H-bridge five-level inverter (CHB-5LI) based on the novel sliding mode control (NSMC). The proposed method can generate pulse-width modulation (PWM) without using conventional modulation techniques based on carrier waves. With the proposed NSMC technique, the PWM pulses can be obtained by the control signal u(t) from the output of the sliding mode controller and the levels of comparison. To eliminate the chattering and increase the speed convergence of the controller, the integral sliding-mode surface combined with a first-order low-pass filter (LPF) is used. The stability of the control system is validated by Lyapunov theory. The simulation and experimental results show that the proposed NSMC method has strong robustness, and better performance for multi-level inverter control systems with low total harmonic distortion, Common-Mode (CM) voltage reduction, switching frequency diminution, and less switching loss

A Robust Control for Five-level Inverter Based on Integral Sliding Mode Control

This paper presents a new control strategy for cascaded H-bridge five-level inverter (CHB-5LI) based on the novel sliding mode control (NSMC). The proposed method can generate pulse-width modulation (PWM) without using conventional modulation techniques based on carrier waves. With the proposed NSMC technique, the PWM pulses can be obtained by the control signal u(t) from the output of the sliding mode controller and the levels of comparison. To eliminate the chattering and increase the speed convergence of the controller, the integral sliding-mode surface combined with a first-order low-pass filter (LPF) is used. The stability of the control system is validated by Lyapunov theory. The simulation and experimental results show that the proposed NSMC method has strong robustness, and better performance for multi-level inverter control systems with low total harmonic distortion, Common-Mode (CM) voltage reduction, switching frequency diminution, and less switching loss

Sustainable Growth and Ethics: a Study of Business Ethics in Vietnam Between Business Students and Working Adults

Sustainable growth is not only the ultimate goal of business corporations but also the primary target of local governments as well as regional and global economies. One of the cornerstones of sustainable growth is ethics. An ethical organizational culture provides support to achieve sustainable growth. Ethical leaders and employees have great potential for positive influence on decisions and behaviors that lead to sustainability. Ethical behavior, therefore, is expected of everyone in the modern workplace. As a result, companies devote many resources and training programs to make sure their employees live according to the high ethical standards. This study provides an analysis of Vietnamese business students’ level of ethical maturity based on gender, education, work experience, and ethics training. The results of data from 260 business students compared with 704 working adults in Vietnam demonstrate that students have a significantly higher level of ethical maturity. Furthermore, gender and work experience are significant factors in ethical maturity. While more educated respondents and those who had completed an ethics course did have a higher level of ethical maturity, the results were not statistically significant. Analysis of the results along with suggestions and implications are provided

Production and characterization of protease from halophilic virgibacillus species CD6

In enzyme production industries, the major challenges that hinder the efficient and economic commercial scale application of proteases are their stability in broad range of pH, temperature, salinity, as well as their optimal activity in the presence of metal ions, organic solvents and detergents. Moreover, the enzyme purification steps also contribute to the cost of production. To overcome this problem, characterization and production of crude protease with attractive properties from wild bacterial isolate could be an alternative as it is a more cost-effective way compared to production of protease that involves purification steps and protein engineering approach. Therefore, crude protease of Virgibacillus sp. CD6 isolated from salted-fish was characterized in this study using azocasein assay and bioinformatics tools. Protease production was found to be highest when using soybean meal and yeast extract as nitrogen source compared to other organic nitrogen sources. The protease exhibited vast range of stability with optimum activity at 10.0 % (w/v) NaCl, 60ºC, pH 7 and 10, indicating its polyextremophilicity. The enzyme activity was enhanced by Mg2+, Mn2+, Cd2+ and Al3+. Both PMSF and EDTA hindered protease activity, denoting the presence of serine protease and metalloprotease properties respectively. High protease stability (>80%) was demonstrated in presence of organic solvents and detergent constituents investigated, and surprisingly it is exceptionally compatible with commercial detergents. Phylogenetic analyses revealed that proteases of Virgibacillus sp. demonstrated far distance relationship with other species, which worth for further exploration. Attributes of this protease can actualize necessity of searching superlative enzymes from extremophiles for diverse applications, particularly in detergent industry

The spindle of oocytes observed by polarized light microscope can predict embryo quality

Background: The aim is to evaluate spindle position of metaphase II oocyte and the development of embryos originated from oocytes with spindle and without spindle.Methods: Cross-sectional analysis Research: 250 MII oocytes were analyzed with polarized microscope in Military Institute of Clinical Embryology and Histology, Vietnam Military Medical University.Results: Spindles were detected in 170 (77.98%) of 218 metaphase II oocytes, 115 spindles (67.65%) of MII oocytes is beneath or adjacent to the first polar body, 55 oocytes had the spindle located between 300 and 1800 away from the first polar body. Fertilization rate and the rate of good quality embryos in oocytes with a visible spindle (77.98% and 61.02%) were higher than those in oocytes without a visible spindle (22.02% and 36.84%), the difference was statistically significant with p <0.001 and p <0.05.Conclusions: The spindle position of metaphase II oocytes is not always beneath or adjacent to the first polar body. Fertilization rate and the rate of good quality embryos in oocytes with a visible spindle were higher than those in oocytes without a visible spindle

A Generalization Bound of Deep Neural Networks for Dependent Data

Existing generalization bounds for deep neural networks require data to be independent and identically distributed (iid). This assumption may not hold in real-life applications such as evolutionary biology, infectious disease epidemiology, and stock price prediction. This work establishes a generalization bound of feed-forward neural networks for non-stationary $\phi$-mixing data

'An Early Morning' and 'Moonlit Night' by Thach Lam Translated from the Vietnamese by Quan Manh Ha

Thach Lam (1909-1942) was a member of the Self-Strength Literary Group (1932-1945), which promoted the New Poetry movement, individualism in literature, French-influenced romanticism, and modernism. The Self-Strength Literary Group condemned feudalism and Confucian values that suffocated personal pursuit of happiness. Thach Lam is most known for his clear narrative style and the subtlety of his characters’ emotions. His fiction differs from that of other members of the Self-Strength Literary Group because he prefers to focus on the life of the common, working-class people in the countryside setting, and he does not romanticize reality. Literature, to him, must condemn social ills and help people live morally. His childhood was lived in poverty, and he died of tuberculosis at the age of thirty-three. The present paper presents translations of two of his short stories

'An Early Morning' and 'Moonlit Night' by Thach Lam Translated from the Vietnamese by Quan Manh Ha

Thach Lam (1909-1942) was a member of the Self-Strength Literary Group (1932-1945), which promoted the New Poetry movement, individualism in literature, French-influenced romanticism, and modernism. The Self-Strength Literary Group condemned feudalism and Confucian values that suffocated personal pursuit of happiness. Thach Lam is most known for his clear narrative style and the subtlety of his characters’ emotions. His fiction differs from that of other members of the Self-Strength Literary Group because he prefers to focus on the life of the common, working-class people in the countryside setting, and he does not romanticize reality. Literature, to him, must condemn social ills and help people live morally. His childhood was lived in poverty, and he died of tuberculosis at the age of thirty-three. The present paper presents translations of two of his short stories

SEARCH FOR ENTITIES BASED ON THE IMPLICIT SEMANTIC RELATIONS

The ability to infer undefined information/knowledge by similar inference is one of the natural abilities of human. The paper aims to study, simulate the above ability. The IRS model searches for undefined information/knowledge from an unfamiliar domain using similarities from familiar domains, through query. Because the semantic relations or similarities are not explicitly stated in the query, the IRS model is called an implicit semantic entity search model. The paper presents extracting, clustering, ranking techniques and a model of implicit relational search on Vietnamese language domain