6,292 research outputs found
Oral History of Tuan Duc Tran
No full textMy narrator is Mr. Tuan Duc Tran. He was born on July 20th, 1965 in Da Lat, Vietnam. He moved to America in 1993, first stopping by Thailand and the Philippines. Mr. Tran is one out of seven siblings. In Vietnam, he earned his degree in mechanical engineering. His father was a colonel in southern Vietnam and was imprisoned from 1975 until 1980 and was eventually freed and subsequently defected to the U.S. Mr. Tran’s father sponsored the entire family to come to California, first settling in Fremont located in the Bay Area, where he obtained an AA from Ohlone community college. His mother passed away just four years after moving to the US. Mr. Tran is married and has one son. In our interview, we discuss his life in Vietnam, adjusting to American culture, the difference between Vietnamese and American academics, and how he ended up moving to Fountain Valley, where he now lives and works in production management in the health field.Recorded digitall
Two problems in graph Ramsey theory
Full text linkWe study two problems in graph Ramsey theory. In the early 1970's, Erd\H{o}s
and O'Neil considered a generalization of Ramsey numbers. Given integers
and with , they asked for the least integer
such that in any red-blue coloring of the -subsets of , there is a set of size such that either each of its
-subsets is contained in some red -subset, or each of its -subsets is
contained in some blue -subset. Erd\H{o}s and O'Neil found an exact formula
for when . In the arguably more interesting case where
, they showed for sufficiently
large . Our main result closes the gap between these lower and upper bounds,
determining the logarithm of up to a multiplicative factor.
Recently, Dam\'asdi, Keszegh, Malec, Tompkins, Wang and Zamora initiated the
investigation of saturation problems in Ramsey theory, wherein one seeks to
minimize such that there exists an -edge-coloring of for which any
extension of this to an -edge-coloring of would create a new
monochromatic copy of . We obtain essentially sharp bounds for this
problem.Comment: 10 page
Balanced supersaturation for some degenerate hypergraphs
Full text linkA classical theorem of Simonovits from the 1980s asserts that every graph
satisfying must contain copies of . Recently, Morris and
Saxton established a balanced version of Simonovits' theorem, showing that such
has copies of , which
are `uniformly distributed' over the edges of . Moreover, they used this
result to obtain a sharp bound on the number of -free graphs via the
container method. In this paper, we generalise Morris-Saxton's results for even
cycles to -graphs. We also prove analogous results for complete
-partite -graphs.Comment: 24 page
Oral History of Ryan Tuan Pham
No full textAn oral history with Mr. Ryan Tuan Pham, born in 1965 in Saigon, Vietnam. He was a student during the time of the war and lived in Long An, Vietnam. He has five brothers and five sisters, and he is the eighth child. He comes from a Catholic family. Ryan talks about his childhood memories and memories of 1975. He left Vietnam at the age of 16 with some of his relatives by boat. He was sponsored to the U.S. and continued his education in high school and college. He also took English as a Second Language classes. In his early years in the U.S., he worked in a clothing factory in order to provide for himself. Now he works as a customs broker. Ryan takes part in a Vietnamese traditional culture music club. He has two daughters with his ex-wife. In 2014, he moved to Anaheim and now lives with his current girlfriend.Recorded Digitall
Critical Compressive Strain of Concrete under a Long-term Deformation Effect Part I. Experiments
No full textThis paper focuses on the effect of creep on the critical compressive strain (CCS) of concrete. The strain of concrete corresponding to the peak compressive stress is crucial in the selection of the ultimate yield strength of the reinforcing bar used in reinforced concrete columns. Among the various influencing factors, such as the creep, shrinkage, loading rate and confinement, the effect of creep and shrinkage is the most significant. So far, investigations into how these factors can affect the CCS of concrete have been rare. Therefore, to investigate the effect of creep and shrinkage on CCS, an experimental (part I) and a parametric study (part II) were conducted, as presented in these papers (part I considers creep effect, part II considers effect of creep and shrinkage). In part I, experiments pertaining to the loading age, loading rate, loading duration and loading and creep levels were conducted to study the effect of these variables on the CCS of concrete. It was found that the effects of the loading rate, loading age, and level and duration on the CCS of concrete were negligible. However, it is very important to consider the effect of creep.This research was supported by a grant (Code# ’09 R&D A01)
from Cutting-edge Urban Development Program funded by Ministry
of Land, Transport and Maritime Affair of Korean government
The Cpc1 Regulator of the Cross-Pathway Control of Amino Acid Biosynthesis Is Required for Pathogenicity of the Vascular Pathogen Verticillium longisporum
No full textThe plant-pathogenic fungus Verticillium longisporum is a causal agent of early senescence and ripening in crucfferous crops like Brassica napus. Verticillium wilts have become serious agricultural threats in recent decades. Verticillium species infect host plants through the roots and colonize xylem vessels of the host plant. The xylem fluid provides an environment with limited carbon sources and unbalanced amino acid supply, which requires V longisporum to induce the cross-pathway control of amino acid biosynthesis. RNA-mediated gene silencing reduced the expression of the two CPC1 isogenes (VlCPC1-1 and VlCPC1-2) of the allodiploid V. longisporum up to 85%. VlCPC1 encodes the conserved transcription factor of the cross-pathway control. The silenced mutants were highly sensitive to amino-acid starvation, and the infected plants showed significantly fewer symptoms such as stunting or early senescence in oilseed rape plant infection assays. Consistently, deletion of single CPC1 of the haploid V dahliae resulted in strains that are sensitive to amino-acid starvation and cause strongly reduced symptoms in the plant-host tomato (Solanum lycopersicum). The allodiploid V longisporum and the haploid V dahliae are the first phytopathogenic fungi that were shown to require CPC1 for infection and colonization of their respective host plants, oilseed rape and tomato
Text Recognition in Natural Scenes
Full text linkTitle: Text Recognition in Natural Scenes Author: Tuan Hiep Tran Abstract: The main topic of our thesis is text recognition in natural sce- nes. This technology has finds many useful applications in the present world and has a great potential in the future one. We are analyzing the topic from theoretical but also from experimental perspective. Detailed analysis is done in theoretical part of this work. Based on this analysis, we propose inte- grating algoritm ER proposed by Matas and Neumann for letter detection with modified algorithm from Phan and co. for word recognition. Proposed method had been experimentally evaluated on testset ICDAR 2013 and ar- chieved recall 0.6 and precision 0.72. Our work also includes C++ library for text recognition, console and gui application for text recognition using the proposed method.
Molecular diagnosis to discriminate pathogen and apathogen species of the hybrid Verticillium longisporum on the oilseed crop Brassica napus
Full text linkThe cruciferous fungal pathogen Verticillium longisporum represents an allodiploid hybrid with long spores and almost double the amount of nuclear DNA compared to other Verticillium species. V. longisporum evolved at least three times by hybridization. In Europe, virulent A1xD1 and avirulent A1xD3 hybrids were isolated from the oilseed crop Brassica napus. Parental A1 or D1 species are yet unknown whereas the D3 lineage represents Verticillium dahliae. Eleven V. longisporum isolates from Europe or California corresponding to hybrids A1xD1 or A1xD3 were compared. A single characteristic type of nuclear ribosomal DNA could be assigned to each hybrid lineage. The two avirulent A1xD3 isolates carried exclusively D3 ribosomal DNA (rDNA) which corresponds to V. dahliae. The rDNA of all nine A1xD1 isolates is identical but distinct from D3 and presumably originates from A1. Both hybrid lineages carry two distinct isogene pairs of four conserved regulatory genes corresponding to either A1 or D1/D3. D1 and D3 paralogues differ in several single nucleotide polymorphisms. Southern hybridization patterns confirmed differences between the A1 and D1/D3 isogenes and resulted in similar patterns for D1 and D3. Distinct signatures of the Verticillium transcription activator (VTA)2 regulatory isogene pair allow identification of V. longisporum hybrids by a single polymerase chain reaction and the separation from haploid species as V. dahliae or Verticillium albo-atrum. The combination between VTA2 signature and rDNA type identification represents an attractive diagnostic tool to discriminate allodiploid from haploid Verticillia and to distinguish between A1xD1 and A1xD3 hybrids which differ in their virulence towards B. napus
Aspidistra phongdiensis (Asparagaceae), a new species from Central Vietnam
No full textChinh, Vu Tien, Dinh, Dien, Le, Tuan Anh, Doan, Quoc Tuan, Le, Ngoc Tuan, Le, Van Huong, Tran, Nam Thang, Vislobokov, Nikolay A. (2023): Aspidistra phongdiensis (Asparagaceae), a new species from Central Vietnam. Phytotaxa 591 (1): 64-70, DOI: 10.11646/phytotaxa.591.1.6, URL: http://dx.doi.org/10.1094/PDIS-04-22-0755-PD
QoS Provisioning for VoIP Traffic by Deploying Admission Control
No full textInternational Workshop, Art-QoS 2003 Warsaw, Poland, March 24–25, 2003
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