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Dung, N.T.,Seo, K. Academic Press 2015 Journal of mathematical analysis and applications Vol.423 No.2
Let M be an n-dimensional complete orientable noncompact hypersurface in a complete Riemannian manifold of nonnegative sectional curvature. For 2@?n@?6, we prove that if M satisfies the δ-stability inequality (0<δ@?1), then there is no nontrivial L<SUP>2β</SUP> harmonic 1-form on M for some constant β. We also provide sufficient conditions for complete hypersurfaces to satisfy the δ-stability inequality. Moreover, we prove a vanishing theorem for L<SUP>2</SUP> harmonic 1-forms on M when M is an n-dimensional complete noncompact submanifold in a complete simply-connected Riemannian manifold N with sectional curvature K<SUB>N</SUB> satisfying that -k<SUP>2</SUP>@?K<SUB>N</SUB>@?0 for some constant k.
Dung, D.T.M.,Dung, P.T.P.,Oanh, D.T.K.,Vu, T.K.,Hahn, H.,Han, B.W.,Pyo, M.,Kim, Y.G.,Han, S.B.,Nam, N.H. Elsevier 2017 Arabian journal of chemistry Vol.10 No.4
<P>A series of novel 5'(7')-substituted-2'-oxospiro[1,3] dioxolane-2,3'-indoline-based N-hydroxypropenamides were designed, synthesized and evaluated for histone deacetylase (HDAC) inhibition and cytotoxicity. It was found that the compounds in this series displayed potent inhibitory effects against HDAC2 with IC50 values as low as 0.284 mu M, almost comparable to that of SAHA (IC50, 0.265 mu M), a positive control. In Western blot analysis, these compounds also exhibited noted inhibition toward histone deacetylation and this inhibition was found to correlate well with the cytotoxicity of the compounds in three human cancer cell lines. Docking studies indicated the compounds in this series bound to HDAC2 with high binding affinities (similar to -9.8 kcal/mol) compared to SAHA (-7.4 kcal/mol). (C) 2015 The Authors. Production and hosting by Elsevier B.V. on behalf of King Saud University.</P>
Standard Penetration Test Performance in Sandy Deposits
N. T. Dung,정성교 한국지반공학회 2013 한국지반공학회논문집 Vol.29 No.10
This paper presents an equation to depict the penetration behavior during the standard penetration test (SPT) in sandydeposits. An energy balance approach is considered and the driving mechanism of the SPT sampler is conceptuallymodeled as that of a miniature open-ended steel pipe pile into sands. The equation consists of three sets of inputparameters including hyperbolic parameters (m and λ) which are difficult to determine. An iterative technique is thusapplied to determine the optimized values of m and λ using three measured values from a routine SPT data. It is verifiedfrom a well-documented record that the simulated penetration curves are in good agreement with the measured ones. At a given depth, the increase in m results in the decrease in λ and the increase in the curvature of the penetrationcurve as well as the simulated N-value. Generally, the predicted penetration curve becomes nearly straight for the portionof exceeding the seating drive zone, which is more pronounced as soil density increases. Thus, the simulation methodcan be applied to extrapolating a prematurely completed test data, i.e., to determining the N value equivalent to a 30cm penetration. A simple linear equation is considered for obtaining similar results.
Dung, N.T.,정성교,김성렬,정진교 한국지반공학회 2007 한국지반공학회논문집 Vol.23 No.3
Deep foundations have been popularly installed in hard stratum such as gravels or rocks in Korea. However, it is necessary to consider sand or sandy gravel layers that locate at the mid-depths as the bearing stratum of piles in the thick Nakdong River deltaic deposits, as done in the Chaophraya (Bangkok) and Mississippi River deltas. This study was focused on the finding of suitable methods for estimating bearing capacity when driving prestressed high-strength concrete (PHC) piles to a required depth in the deltaic area. Ground investigation was performed at five locations of two sites in the deltaic area. Bearing capacity of the driven piles has been computed using a number of proposed methods such as CPT-based and other analytical methods, based on the ground investigation and comparison one another other. Five PDA (pile driving analyzer) tests were systematically carried out at the whole depths of embedded piles, which is a well-known useful technique for the purposes. As the results, the bearing capacities calculated by various methods were compared with the PDA and static load testing results. It was found that the shaft resistance is significantly governed by set-up effects and then the long-term value agrees well with that of the method. Also, the design methods for toe resistance were determined based on the SLT result, rather than PDA results that led to underestimation. Moreover, using the CPT results, appropriate methods were proposed for calculating the bearing capacity of the piles in the area.
N. T. Dung,정성교,김성렬,백승훈 대한토목학회 2011 KSCE JOURNAL OF CIVIL ENGINEERING Vol.15 No.6
Standard Penetration Test (SPT)-based design methods for pile foundations have been extensively used in Korean practice. However, their applicability for local application has seldom been examined, particularly for the thick deposits, such as in the Nakdong River deltaic area. This paper examines the applicability of three common SPT-based methods to deep sandy deposits in the delta. Routine SPT data, in which the test was completed for each of the N = 50 blows at less than 30 cm penetration in the last two increments of 15 cm, were adopted. A special SPT was conducted to examine the general relationship between penetration and blow counts in dense sands. Based on the special SPT and another well-documented case study, a simple linear extrapolation was developed to estimate data equivalent to N > 50. PDA (Pile Driving Analyzer) tests were also carried out to evaluate energy efficiency of the donut hammer used for the routine SPT. Energy correction factor (CE) was determined as 0.9. Using the corrected Nvalues,the estimated SPT-based toe resistances were compared with data obtained from PDA tests, field load tests on piles, and a CPT (Cone Penetration Test)-based method. Results indicate that the SPT-based methods generally manifest a rather low reliability. The recommended Meyerhof’s method is deemed applicable for the preliminary design.