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[ICACE2022] Model identification of two double-acting pistons pump
Danh Khoa Nguyen,Cong Toai Truong,Van Tu Duong,Huy Hung Nguyen,Tan Tien Nguyen 한국마린엔지니어링학회 2023 한국마린엔지니어링학회지 Vol.47 No.2
The Covid-19 pandemic has had a comprehensive and far-reaching impact on various fields, especially in the medical aspect. Additionally, many variants of this coronavirus have appeared due to mutation, each of which has distinguished influences. During the Covid-19 pandemic, medical equipment, especially ventilators, has seen a severe shortage. Thus, many studies of ventilators machine have been carried out around the world. And according to these studies, airflow control is one of the critical issues of ventilator machine research that saves human life. Understanding the above problem, it is necessary to conduct system modeling and obtain a model which has high linearity so that the parameters of the ventilation can be controlled to achieve better accuracy. This paper presents the model identification of a two double-acting piston pump system using experimental data. First order plus dead time method is applied to achieve the identification model. The data used for identification and validation are collected by conducting several practical tests on the two double-acting pistons pump system. The discussion on the identified model and future works are also included in this paper.
Caries Arresting Effect of Silver Diamine Fluoride in Vietnamese Preschool Children
Yen Hoang Thi Nguyen,Masayuki Ueno,Takashi Zaitsu,Toai Nguyen,Yoko Kawaguchi 대한예방치과학회 2017 International Journal of Clinical Preventive Denti Vol.13 No.3
Objective: A 1-year longitudinal study compared the effectiveness of annual and biannual silver diamine fluoride (SDF) applications on caries arrest among preschool children. Methods: A total of 295 children aged 2 to 3 years from 6 public preschools in Vietnam were selected and divided into 3 groups: Group 1 (G1) received annual SDF (n=90), Group 2 (G2) received biannual SDF (n=99), and Group 3 (G3) did not receive SDF (n=106). Clinical oral examination was performed at baseline, 6 months and 1 year. Results: Mean ds, the main component of dmfs, were 14.92 in G1, 15.91 in G2, and 18.17 in G3 at baseline, and no significant differences were found between the 3 groups. From baseline to 6 months and to 1 year, mean ds increased significantly in all children: 1.88 and 3.75 in G1, 2.22 and 3.47 in G2, and 5.20 and 8.91 in G3. Mean ds was significantly higher in G3 than G1 and G2 at 6 months and 1 year. At baseline, about 60% of active carious surfaces were treated with SDF in both G1 and G2. The proportions of arrested caries surfaces at 6 months and 1 year were 61.8% and 47.6% in G1, and 57.7% and 64.0% in G2. Significantly higher proportions of arrested caries surfaces were observed in G2 than G1 at 1 year. Conclusion: The study demonstrated a caries arresting effect of SDF in preschool children and its effect was greater after biannual application than annual application.
Valliyodan, Babu,Van Toai, Tara T.,Alves, Jose Donizeti,de Fá,tima P. Goulart, Patricia,Lee, Jeong Dong,Fritschi, Felix B.,Rahman, Mohammed Atiqur,Islam, Rafiq,Shannon, J. Grover,Nguyen, Henry T MDPI 2014 INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES Vol.15 No.10
<P>Much research has been conducted on the changes in gene expression of the model plant <I>Arabidopsis</I> to low-oxygen stress. Flooding results in a low oxygen environment in the root zone. However, there is ample evidence that tolerance to soil flooding is more than tolerance to low oxygen alone. In this study, we investigated the physiological response and differential expression of root-related transcription factors (TFs) associated with the tolerance of soybean plants to soil flooding. Differential responses of PI408105A and S99-2281 plants to ten days of soil flooding were evaluated at physiological, morphological and anatomical levels. Gene expression underlying the tolerance response was investigated using qRT-PCR of root-related TFs, known anaerobic genes, and housekeeping genes. Biomass of flood-sensitive S99-2281 roots remained unchanged during the entire 10 days of flooding. Flood-tolerant PI408105A plants exhibited recovery of root growth after 3 days of flooding. Flooding induced the development of aerenchyma and adventitious roots more rapidly in the flood-tolerant than the flood-sensitive genotype. Roots of tolerant plants also contained more ATP than roots of sensitive plants at the 7th and 10th days of flooding. Quantitative transcript analysis identified 132 genes differentially expressed between the two genotypes at one or more time points of flooding. Expression of genes related to the ethylene biosynthesis pathway and formation of adventitious roots was induced earlier and to higher levels in roots of the flood-tolerant genotype. Three potential flood-tolerance TFs which were differentially expressed between the two genotypes during the entire 10-day flooding duration were identified. This study confirmed the expression of anaerobic genes in response to soil flooding. Additionally, the differential expression of TFs associated with soil flooding tolerance was not qualitative but quantitative and temporal. Functional analyses of these genes will be necessary to reveal their potential to enhance flooding tolerance of soybean cultivars.</P>