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A Fully-implicit Velocity Pressure coupling Algorithm-IDEAL and Its Applications
Dong-Liang SUN,Zhi-Guo QU,Ya-Ling HE,Wen-Quan TAO 한국전산유체공학회 2008 한국전산유체공학회 학술대회논문집 Vol.2008 No.-
An efficient segregated algorithm for the coupling of velocity and pressure of incompressible fluid flow, called IDEAL (Inner Doubly-Iterative Efficient Algorithm for Linked-Equations), has been proposed by the present authors. In the algorithm there exist double inner iterative processes for pressure equation at each iteration level, which almost completely overcome two approximations in SIMPLE algorithm. Thus the coupling between velocity and pressure is fully guaranteed, greatly enhancing the convergence rate and stability of solution process. The performance of the IDEAL algorithm for three-dimensional incompressible fluid flow and heat transfer problems is analyzed and a systemic comparison is made between the algorithm and three other most widely-used algorithms (SIMPLER, SIMPLEC and PISO). It is found that the IDEAL algorithm is the most robust and the most efficient one among the four algorithms compared. This new algorithm is used for the velocity prediction of a new interface capturing method ?VOSET ,also proposed by the present author. It is found that the combination of VOSET and IDEAL can appreciably enhance both the interface capture accuracy and convergence rate of computations.
Dong-xia Zhao,Dong-xia Fan,Ya-ping Guo 제어·로봇·시스템학회 2022 International Journal of Control, Automation, and Vol.20 No.8
In this paper, the well-posedness and stability of a 1-d 2×2 hyperbolic system under proportional feedback control is addressed. The semigroup approach and norm equivalence theorem is adopted to obtain the explicit dissipative condition for control parameters. The asymptotic spectral analysis of the system is presented. It is shown that the real part of the eigenvalues goes to some negative constant as the modulus of eigenvalues goes to +∞. Moreover, we find that there is a group of generalized eigenfunctions which forms a Riesz basis of the Hilbert state space. Hence, the spectrum determined growth condition holds, and then the exponential stability is established.
Dong-Xia Zhao,Jun-Min Wang,Ya-Ping Guo 제어·로봇·시스템학회 2019 International Journal of Control, Automation, and Vol.17 No.1
This paper addresses the exponential stability for an interconnected system of an nth-order ODE systemwith the input governed by the Dirichlet boundary of a heat equation, and conversely, the output of the ODE isfluxed into the heat equation. The semigroup approach is adopted to show that the system operator is well-posed. We establish the exponential stability of the system by Riesz basis method. Furthermore, with MATLAB software,some numerical simulations are presented to show the effectiveness of the interconnection between the heat PDEand ODE systems.
Risk Management Qualitatively on Railway Signal System
Zhang, Ya-Dong,Guo, Jin The Korean Society for Railway 2009 International Journal of Railway Vol.2 No.3
Risk management is an important part of system assurance and it is widely used in safety-related system. Railway signal system is one kind of safety-related system and its most important goal is to guarantee the safety of railway system. The method based on risk management can find and solve the security issues of railway signal system more effectively. This paper introduces the basic conception of risk management, studies the whole process of risk management and related tools and techniques and discusses some key points qualitatively combining with the particularity of railway signal system.
동아여 ( Ya Ru Dong ),이국영 ( Guo Ying Li ) 한국한자한문교육학회 2012 漢字 漢文敎育 Vol.28 No.-
新加坡因爲社會語言環境的改變進行了2004年和2011年兩次大規模的華文敎改, 由"少敎多學"到"樂學善用". 作者認爲, 這只是敎學策略上的突破, 其核心問題卽新加坡小學華文識字敎學"識什마"(字種)、"識多少"(字量)、"즘마識"(字序)三個最基本的問題병沒有解決. 本論文對新加坡2007年出版的『小學華文』12冊敎材中的核心單元部分、課外閱讀輔助讀物『記憶像一個箱子』、輔助刊物『新朋友』、『新天地』、『新列車』的封面閱讀篇章和華文報刊『聯合早報』中的頭版國際、國內和敎育新聞進行字頻調査, 建立了由這四種材料構成的數據庫, 分別從字種、字量、字序、覆蓋率、復現率等方面對閱讀篇章進行統計、分析與硏究, 報告目前新加坡小學識字敎材幷不符合新加坡本地的華文字頻規律的現狀, 探討如何使新加坡小學生識字敎材設計更具新加坡特色, 更加科學化、合理化、系統化, 幷提出建立新加坡『兒童高頻字表』, 把字表中的字融入敎材編寫過程中, 科學建序;再建立『兒童常用字表』, 把타融入敎案設計過程中, 結合"滾動式"識字敎學法, 使學習者更加有趣地學習, 從而體現新加坡敎育部大力提倡和推廣的"樂學"的敎學理念和"善用"的敎學主張. Singapore changing social language environment has brought about two major reforms to the Chinese language education namely "teach less and learn more" and "making learning interesting and more relevant". The objective is to motivate pupils to learn more and encourage the capable pupils to help the weaker pupils in the learning process. However, the author believes that this reform is just a breakthrough in teaching strategies, but the core problem is not resolved. The primary school Chinese literacy teaching in Singapore has not been resolved which include 3 basic aspects like word types, word content and word order. In this thesis, the author focuses on word frequency survey taken from the following: (1) 12 core units in the primary school Chinese text books from the Singapore Ministry of Education. (2) Reading books which are widely used by Singapore primary school "Memory is like a box". (3) The front page of the auxiliary publications including "New Friends", "New World ", "New Train". (4) The front page of the Singapore Chinese newspaper "Lianhe Zaobao" which includes international, domestic and educational information. Based on the word species, the amount of words, word order and coverage of the four databases, statistics are compiled, analyzed and researched. It`s noted that the current Chinese language literacy teaching in Singapore primary schools is not so adequate. The literacy teaching materials in Singapore can be made more adequate by making them more featured, more scientific, reasonable and systematic. The author proposes the creation of two unique charts relevant to the Singapore children. Firstly "children`s high-frequency words" chart to be used for literacy teaching materials and secondly" children`s common usage words" chart to integrate with literacy teaching using`` rolling strategy`` and put it into the lesson plan design process, so that learning is made more interesting. This goes hand in hand with the Ministry of Education promotion "making learning interesting and more relevant".
Jian Dong Cui,Ya Nan Zhang,Gui Xia Zhao,Shi Ru Jia,Guo Qun Zhao,Si Zhang,Jun Lu 한국식품과학회 2010 Food Science and Biotechnology Vol.19 No.2
To develop a new method for producing aspartame (APM), a simple and efficient strategy for the isolation of certain microorganisms producing APM from soil samples was designed. A newly strain with secreting certain specific dipeptidase to directly synthesize APM from the substrates of L-aspartic acid (L-Asp) and Lphenylalanine methyl ester (L-PM) without protection for amino acid side chains was screened from soil samples. APM concentration in reaction mixture was quantified by high performance liquid chromatography (HPLC), yield reached 0.015 g/L. Examination of the general morphological characteristics and data from the sequence analysis of the rDNA-ITS gene led to identification of the isolate as a strain of fungal endophyte spp. The newly isolated strain had a high potential for application in industrial processes for APM production. In particular, this new method was low cost for synthesis of APM during the reaction due to avoiding protection for amino acid side chains and optical resolution of the mixtures. As we known it, this is first report that a newly strain with a high potential for selective synthesis of the APM was isolated from soil.
Sulforaphane Inhibits the Proliferation of the BIU87 Bladder Cancer Cell Line via IGFBP-3 Elevation
Dang, Ya-Mei,Huang, Gang,Chen, Yi-Rong,Dang, Zhong-Feng,Chen, Cheng,Liu, Feng-Lei,Guo, Ying-Fang,Xie, Xiao-Dong Asian Pacific Journal of Cancer Prevention 2014 Asian Pacific journal of cancer prevention Vol.15 No.4
Aim: To investigate effects of sulforaphane on the BIU87 cell line and underlying mechanisms involving IGFBP-3. Methods: Both BIU87 and IGFBP-3-silenced BIU87 cells were treated with sulforaphane. Cell proliferation was detected by MTT assay. Cell cycle and apoptosis were determined via flow cytometry. Quantitative polymerase chain reaction and Western blotting were applied to analyze the expression of IGFBP-3 and NF-${\kappa}B$ at both mRNA and protein levels. Results: Sulforaphane (80 ${\mu}M$) treatment could inhibit cell proliferation, inducing apoptosis and cell cycle arrest at G2/M phase. All these effects could be antagonized by IGFBP-3 silencing. Furthermore, sulforaphane (80 ${\mu}M$) could down-regulate NF-${\kappa}B$ expression while elevating that of IGFBP-3. Conclusions: Sulforaphane could suppress the proliferation of BIU87 cells via enhancing IGFBP-3 expression, which negatively regulating the NF-${\kappa}B$ signaling pathway.