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NOTE ON ABSTRACT STOCHASTIC SEMILINEAR EVOLUTION EQUATIONS
Tˆon Viˆe. TA 대한수학회 2017 대한수학회지 Vol.54 No.3
This paper is devoted to studying abstract stochastic semilinear evolution equations with additive noise in Hilbert spaces. First, we prove the existence of unique local mild solutions and show their regularity. Second, we show the regular dependence of the solutions on initial data. Finally, some applications to stochastic partial differential equations are presented.
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Bản chất văn hóa của tục ngữ Việt
Nguyễn Việt Hương 한국외국어대학교 동남아연구소 2011 東南亞硏究 Vol.21 No.1
Proverb is the treasure where stores people’s folk knowledge, summarized from the general experiences about the nature and social relations. Proverb expressed in focus the way of living, the features of thinking, expressing the thought, it means the way of speaking and thinking of people. Therefore, it is a synthetical phenomenon where the cultural hallmark quite obviously. In that way, we can assert surely that there is the cultural nature inside the proverb. With the linguistic essence and artistic essence, the cultural nature contributes to enhance strength of proverb in folklore in general and genres of literature in particular. This paper reconfirms the range of proverb notion and the line to distinguish proverb from several genres of folk literature. After that, the paper analyzes aspects of content in proverb to enhance the cultural nature of this genre. Proverb is a vivid picture about Vietnamese culture. The paper mentiones on the aspects of material life and the social life that expressed through the topics about the custom in Viet proverb. Particularly, the paper emphasizes and analyses the advantages of proverb in representing conceptions, the way of assessment, philosophy of human life, expressing the ability in thinking and reflecting the psychological life and spirit of Vietnamese. This is the most typical character for nature of proverb in general and being a specific characteristics to distinguish proverb’s cultural essence, making cultral characteristic of proverb is more original than if comparing with the other genres in folklore. The paper indicates that using proverb in the life being an original characteristic in treatment culture of Vietnamese people. For that reason, the paper demonstrates that Viet proverb contains all cultural hallmark of traditional Vietnamese society.
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Vi T. Nguyen,Dongkyu Lee 국제구조공학회 2021 Steel and Composite Structures, An International J Vol.39 No.5
There are recently some advances in solving numerically topology optimization problems for large-scaled trusses based on ground structure approach. A disadvantage of this approach is that the final design usually includes many bars, which is difficult to be produced in practice. One of efficient tools is a so-called filter scheme for the ground structure to reduce this difficulty and determine several distinct bars. In detail, this technique is valuable for practical uses because unnecessary bars are filtered out from the ground structure to obtain a well-defined structure during the topology optimization process, while it still guarantees the global equilibrium condition. This process, however, leads to a singular system of equilibrium equations. In this case, the minimization of least squares with Tikhonov regularization is adopted. In this paper, a proposed algorithm in controlling optimal Tikhonov parameter is considered in combination with the filter scheme due to its crucial role in obtaining solution to remove numerical singularity and saving computational time by using sparse matrix, which means that the discrete optimal topology solutions depend on choosing the Tikhonov parameter efficiently. Several numerical examples are investigated to demonstrate the efficiency of the filter parameter control algorithm in terms of the large-scaled optimal topology designs.
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The plate on the nonlinear dynamic foundation under moving load
Phuoc T. Nguyen,Thieu V. Vi,Tuan T. Nguyen,Van T. Vu Techno-Press 2023 Coupled systems mechanics Vol.12 No.1
First introduced in 2016, the dynamic foundation model is an interesting topic in which the foundation is described close to reality by taking into account the influence of the foundation mass in the calculation of oscillation and is an important parameter that should be considered. In this paper, a follow-up investigation is conducted with the object of the Mindlin plate on a nonlinear dynamic foundation under moving loads. The base model includes nonlinear elastic springs, linear Pasternak parameters, viscous damping, and foundation mass. The problem is formulated by the finite element analysis and solved by the Newmark-β method. The displacement results at the center of the plate are analyzed and discussed with the change of various parameters including the nonlinear stiffness, the foundation mass, and the load velocity. The dynamic response of the plate sufficiently depends on the foundation mass.
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Super-potentials, densities of currents and number of periodic points for holomorphic maps
Dinh, Tien-Cuong,Nguyê,n, Viê,t-Anh,Vu, Duc-Viet Elsevier 2018 Advances in mathematics Vol.331 No.-
<P><B>Abstract</B></P> <P>We prove that if a positive closed current is bounded by another one with bounded, continuous or Hölder continuous super-potentials, then it inherits the same property. There are two different methods to define wedge-products of positive closed currents of arbitrary bi-degree on compact Kähler manifolds using super-potentials and densities. When the first method applies, we show that the second method also applies and gives the same result. As an application, we obtain a sharp upper bound for the number of isolated periodic points of holomorphic maps on compact Kähler manifolds whose actions on cohomology are simple. A similar result still holds for a large class of holomorphic correspondences.</P>
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Cambodian Species of the Family Arctiidae (Lepidoptera, Noctuoidea)
Bayarsaikhan Ulziijargal,Young-Don Ju,Xuan-Vi Le,Thuch Phalla,Jong Kyun Park,Yang-Seop Bae 한국응용곤충학회 2012 한국응용곤충학회 학술대회논문집 Vol.2012 No.05
The family Arctiidae is a large and diverse family of moths with around 11,155 species of 750 genera (Heppner, 2005) in three subfamilies found all over the world, including 6,000 neotropical species (Scoble, 1995). The family is characterized in the following characters (Kitching & Rawlins, 1999): hindwing with Sc+R and S fused for about 1/3 length of discal cell, occasionally completely fused, or only fused for 1/4 length of cell; almost always with either fore coxa, patagium, or abdomen orange or red and contrasting with color of dorsal thorax; metathorax with tymbal organs appearing as a striated band on katepisternum. Taxonomic study of the Arctiidae in Cambodia has been done by a few foreign entomologists. As the results of this study, about 90 species of 40 genera belonging to Arctiidae were recorded from Cambodia, most of them are recorded for the first time in Cambodia. Besides, 12 species have not been identified yet. The materials for identification are based on the collection of University of Incheon, which were collected from 2009-2012 in Cambodia by Cambodian and Korean researcher.
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