Integrated compensation model using a three-phase neutral point clamped inverter

Normally, when research on active compensation models, previous studies only assumed that the source of harmonics is nonlinear load. The nonlinear load here is fixed and balanced, the supply voltage is considered ideal, i.e. the three-phase source is balanced and there is no distortion. However, in reality, the above assumption is difficult to achieve. Therefore, this paper aims to design an integrated compensation model for different types of harmonic sources. The types of harmonic sources considered here include: harmonic sources generated from nonlinear load and source. The requirement of the integrated compensation model is to create a balanced three-phase voltage at the terminal of the load and the supply current must be a sinusoidal wave in phase with the source voltage. In order to reduce the loss caused by the inverter switching, this paper uses a three-level Neutral Point Clamped inverter. The simulation results performed on Psim software have demonstrated the effectiveness of the proposed integrated compensation model compared to the traditional integrated compensation model in reducing harmonics and stabilizing DC-bus voltage

Trade protection and productivity differentials between multinationals and local firms in Vietnamese manufacturing

This paper investigates the how effective protection and firm ownership affected firm productivity in Vietnam during 2005-2010. In labour-intensive industries and industries with intermediate labour intensity, the level of effective protection in an industry had a significantly negative effect on firm productivity. Multinational enterprise (MNE) joint ventures (JVs) and state-owned enterprises (SOEs) had consistently higher productivity than private firms, with productivity usually being highest in JVs. Wholly-foreign MNEs (WOs) also had significantly higher productivity than private firms in 2005-2007, but lower productivity than JVs or SOEs, and in 2008-2010, WO-private differentials were insignificant. In capital-intensive industries, the pattern of productivity differentials (highest in JVs, followed by SOEs, WOs, and private firms) was similar in the earlier period, but not in the latter period or when all years were included in the sample. The level of effective protection also did not have a significant, independent effect on firm productivity in capital-intensive industries

Pedagogy undergraduates’ perception on twenty-first century skills

Teachers head up their students to the bright future, their role is indispensable, especially in the 21st century, which expects them to be energetic and flexible to apply knowledge to the daily life and carrier task. Examining the perception on 21st century skills teaching of pedagogy teacher-to-be undergraduates - plays a vital role in identifying deficits in teachers’ professional development; as well as organizing training programs to enhance their knowledge and skills. To the best of our knowledge, no study to date has examined pedagogy undergraduates’ perception in Vietnam. This study aimed at examining Vietnamese undergraduates' perception on teaching the 21st century skills. Our crosssectional study used the 21st Century Skills Teaching Scale. Descriptive analysis and ANOVA were performed in this research. The results showed that: (1) Vietnamese pedagogy students had a high level of perception on teaching the 21st century skills; (2) there was no gender difference in their perception; and (3) there was no significant difference in their perception regard to their school years and (4) there was significant difference between those having joined soft skill courses at their university and those having not joined anyone

New “haploid biofilm model” unravels IRA2 as a novel regulator of Candida albicans biofilm formation

published_or_final_versio

Surface-based protein domains retrieval methods from a SHREC2021 challenge

publication dans une revue suite à la communication hal-03467479 (SHREC 2021: surface-based protein domains retrieval)International audienceProteins are essential to nearly all cellular mechanism and the effectors of the cells activities. As such, they often interact through their surface with other proteins or other cellular ligands such as ions or organic molecules. The evolution generates plenty of different proteins, with unique abilities, but also proteins with related functions hence similar 3D surface properties (shape, physico-chemical properties, …). The protein surfaces are therefore of primary importance for their activity. In the present work, we assess the ability of different methods to detect such similarities based on the geometry of the protein surfaces (described as 3D meshes), using either their shape only, or their shape and the electrostatic potential (a biologically relevant property of proteins surface). Five different groups participated in this contest using the shape-only dataset, and one group extended its pre-existing method to handle the electrostatic potential. Our comparative study reveals both the ability of the methods to detect related proteins and their difficulties to distinguish between highly related proteins. Our study allows also to analyze the putative influence of electrostatic information in addition to the one of protein shapes alone. Finally, the discussion permits to expose the results with respect to ones obtained in the previous contests for the extended method. The source codes of each presented method have been made available online

NEW HAPLOID MODEL OF CANDIDA ALBICANS IN MOLECULAR GENETICS AND DRUG DISCOVERY

Ph.DDOCTOR OF PHILOSOPH

Productivity spillovers from foreign multinationals and trade policy: firm-level analysis of Vietnamese manufacturing

This article examines how the presence of foreign multinational enterprises (MNEs) affects productivity in local firms in Vietnamese manufacturing in 2005-2010. The paper also emphasizes how import protection has affected these productivity spillovers and how spillovers from wholly-foreign MNEs and joint ventures differ. The most consistent result suggests wholly-foreign MNEs impart negative spillovers while joint ventures generate positive spillovers. Theory and random effects estimates also indicate that import protection reduces local firm productivity and weakens the effect of spillovers from all MNEs, but this result is not obtained when a fixed effects estimator is used. Results are similar in samples of labour-intensive industries, which include close to three-fourths of all sample firms, but differ markedly for more capital-intensive groups

Productivity spillovers from foreign multinationals and trade policy: firm-level analysis of Vietnamese manufacturing

This article examines how the presence of foreign multinational enterprises (MNEs) affects productivity in local firms in Vietnamese manufacturing in 2005-2010. The paper also emphasizes how import protection has affected these productivity spillovers and how spillovers from wholly-foreign MNEs and joint ventures differ. The most consistent result suggests wholly-foreign MNEs impart negative spillovers while joint ventures generate positive spillovers. Theory and random effects estimates also indicate that import protection reduces local firm productivity and weakens the effect of spillovers from all MNEs, but this result is not obtained when a fixed effects estimator is used. Results are similar in samples of labour-intensive industries, which include close to three-fourths of all sample firms, but differ markedly for more capital-intensive groups

Development of the Monitoring Program for an Integrated Small-Scale Wind and Solar Systems based on IoT Technology

For monitoring the energy supply from the hybrid small-scale wind turbine generator (WTG) and rooftop solar Photovoltage (PV) systems, this paper presents the design of a management program of the studied system based on the Internet of Things (IoT) technology. The proposed studied system consists of digital power meters that communicate wirelessly to the Programmable Logic Controller (PLC) through the ZigBee communication standard. By using a free cloud platform will greatly facilitate the Supervisory Control and Data Acquisition (SCADA) interface design work for a Human Machine Interface (HMI) or mobile phone. This system configuration may be easy to be fitted for collecting electrical information such as voltage, current, power, frequency of the system to be monitored. This is one of the cheap solutions deployed in small-scale hybrid power systems (HPS) or factories because wireless communication is very convenient in construction and installation