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Search Results: 1 - 10 of 31255 matches for " Thomas Huynh "
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Welcome to Systems — A New Interdisciplinary Open Access Journal for Systems Science and Engineering
Thomas Huynh
Systems , 2013, DOI: 10.3390/systems1010001
Abstract: Natural and human-made systems abound around us. Our solar system, the human body, the food chain, and ecosystems are some examples of natural systems. Some human-made systems are transportation systems, weapon systems, computer systems, software systems, satellite communications systems, ships, missile defense systems, health care systems, the internet, financial systems, and regional economies. Understanding of natural systems is essential to the survival of the human species, which is intertwined with the survival of other species on earth. Having the knowledge and ability to build human-made systems is critical to the employment of systems that effectively serve the needs of their users. To gain such understanding and to acquire such knowledge and ability, it is necessary that cutting-edge research in systems science, systems engineering, and systems-related fields continue. This open access journal aims to achieve quick and global dissemination of results of such research. [...]
Contrasting population genetic patterns within the white-throated sparrow genome (Zonotrichia albicollis)
Lynn Y Huynh, Donna L Maney, James W Thomas
BMC Genetics , 2010, DOI: 10.1186/1471-2156-11-96
Abstract: Here we sequenced 27 autosomal and 12 sex chromosome-linked loci in the white-throated sparrow (Zonotrichia albicollis) to quantify and compare patterns of recombination, linkage disequilibrium (LD), and genetic diversity across the genome of this North American songbird. Genetic diversity on the autosomes varied up to 8-fold, with the lowest diversity observed on the macrochromosomes and the highest diversity on the microchromosomes. Genetic diversity on the sex chromosomes was reduced compared to the autosomes, the most extreme difference being a ~300-fold difference between the W chromosome and the microchromosomes. LD and population structure associated with a common inversion polymorphism (ZAL2/2m) in this species were found to be atypical compared to other macrochromosomes, and nucleotide diversity within this inversion on the two chromosome arrangements was more similar to that observed on the Z chromosome.A negative correlation between nucleotide diversity and autosome size was observed in the white-throated sparrow genome, as well as low levels of diversity on the sex chromosomes comparable to those reported in other birds. The population structure and extended LD associated with the ZAL2/2m chromosomal polymorphism are exceptional compared to the rest of the white-throated sparrow genome.The genomic landscape is influenced by the combined interactions of mutation, recombination, natural selection, genetic drift, and demographics. A primary goal of the field of population genetics is to understand the role and relative importance of these forces in generating and maintaining genetic variation. Within a genome, signatures of these forces can be inferred by examining local levels and patterns of genetic variation. In general, purifying selection is the dominant selective force in molecular evolution and results in a reduction of genetic diversity as new variants are selectively removed from the population [1]. Reductions in diversity can also arise from posit
Student-based Collaborative Network for Delivering Information of Natural Disasters and Climate Adaptation
Chien Huynh,Phuong Huynh
Computer Science , 2013,
Abstract: The student generation nowadays is considered as the Net Generation who grow up in the age of Internet and mobile technology and prefer bringing technological application into their life. The Learning Resource Center, an academic information center, takes the initiative in developing a collaborative network with the participation of students for delivering information of natural disasters and climate adaptation to the people who live in the vulnerable areas of Thua Thien Hue province. The network is aimed at helping local people mitigating vulnerabilities and adapting to the globally climate change for a better life.
Synaptonemal Complex Components Promote Centromere Pairing in Pre-meiotic Germ Cells
Nicolas Christophorou equal contributor,Thomas Rubin equal contributor,Jean-René Huynh
PLOS Genetics , 2013, DOI: 10.1371/journal.pgen.1004012
Abstract: Mitosis and meiosis are two distinct cell division programs. During mitosis, sister chromatids separate, whereas during the first meiotic division, homologous chromosomes pair and then segregate from each other. In most organisms, germ cells do both programs sequentially, as they first amplify through mitosis, before switching to meiosis to produce haploid gametes. Here, we show that autosomal chromosomes are unpaired at their centromeres in Drosophila germline stem cells, and become paired during the following four mitosis of the differentiating daughter cell. Surprisingly, we further demonstrate that components of the central region of the synaptonemal complex are already expressed in the mitotic region of the ovaries, localize close to centromeres, and promote de novo association of centromeres. Our results thus show that meiotic proteins and meiotic organization of centromeres, which are key features to ensure reductional segregation, are laid out in amplifying germ cells, before meiosis has started.
On Minimizing the Standard Error of the Slope in Simple Linear Regression  [PDF]
Steven M. Crunk, Xinh Huynh
Open Journal of Statistics (OJS) , 2014, DOI: 10.4236/ojs.2014.43016
Abstract:

A common homework problem in texts covering calculus-based simple linear regression is to find a set of values of the independent variable which minimize the standard error of the estimated slope. All discussions the authors have heard regarding this problem, as well as all texts with which the authors of this paper are familiar and which include this problem, provide no solution, a partial solution, or an outline of a solution without theoretical proof and the provided solution is incorrect. Going back to first principles we provide the complete correct solution to this problem.

An Empirical Assessment of Public Policy Communications in Central Region of Vietnam  [PDF]
Huynh Quy, Thai Thanh Ha
Modern Economy (ME) , 2018, DOI: 10.4236/me.2018.912128
Abstract:
Communication is the object of policy, as witnessed in the efforts by government and non-government agencies to inform and educate various publics about problems in society. Effective public policy communications are an important tool to help achieve the policy’s objectives. It is imperative that transparency and proactive public policy communications continue to be the anchors of the current working agenda in most of developing countries’ government. The public policy communications in Central Region of Vietnam have been characterized by unpredictable patterns of policy adoption, the geographical distance, and the economic disparity as compared to the capital city of Hanoi. To fill in this academic gap, this paper identified the factors that consist of the public policy communication on the basis of literature review. The conceptual framework was developed and revised in order to lay the theoretical grounds. Based on this, questionnaire was developed for data collection in major locations in Central Vietnam. Multivariate data analysis techniques such as Exploratory Factor Analysis (EFA) and multiple regressions were used to gauge the impacts of possible factors on the public policy communication as perceived from citizen-level perspective in Central Vietnam. Recommendations and implications were drawn to strengthen public policy communication strategies in Central region of Vietnam.
Extremal Problems for Subset Divisors
Tony Huynh
Mathematics , 2013,
Abstract: Let $A$ be a set of $n$ positive integers. We say that a subset $B$ of $A$ is a divisor of $A$, if the sum of the elements in $B$ divides the sum of the elements in $A$. We are interested in the following extremal problem. For each $n$, what is the maximum number of divisors a set of $n$ positive integers can have? We determine this function exactly for all values of $n$. Moreover, for each $n$ we characterize all sets that achieve the maximum. We also prove results for the $k$-subset analogue of our problem. For this variant, we determine the function exactly in the special case that $n=2k$. We also characterize all sets that achieve this bound when $n=2k$.
Trabecular Bone Structure Correlates with Hand Posture and Use in Hominoids
Zewdi J. Tsegai, Tracy L. Kivell, Thomas Gross, N. Huynh Nguyen, Dieter H. Pahr, Jeroen B. Smaers, Matthew M. Skinner
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0078781
Abstract: Bone is capable of adapting during life in response to stress. Therefore, variation in locomotor and manipulative behaviours across extant hominoids may be reflected in differences in trabecular bone structure. The hand is a promising region for trabecular analysis, as it is the direct contact between the individual and the environment and joint positions at peak loading vary amongst extant hominoids. Building upon traditional volume of interest-based analyses, we apply a whole-epiphysis analytical approach using high-resolution microtomographic scans of the hominoid third metacarpal to investigate whether trabecular structure reflects differences in hand posture and loading in knuckle-walking (Gorilla, Pan), suspensory (Pongo, Hylobates and Symphalangus) and manipulative (Homo) taxa. Additionally, a comparative phylogenetic method was used to analyse rates of evolutionary changes in trabecular parameters. Results demonstrate that trabecular bone volume distribution and regions of greatest stiffness (i.e., Young's modulus) correspond with predicted loading of the hand in each behavioural category. In suspensory and manipulative taxa, regions of high bone volume and greatest stiffness are concentrated on the palmar or distopalmar regions of the metacarpal head, whereas knuckle-walking taxa show greater bone volume and stiffness throughout the head, and particularly in the dorsal region; patterns that correspond with the highest predicted joint reaction forces. Trabecular structure in knuckle-walking taxa is characterised by high bone volume fraction and a high degree of anisotropy in contrast to the suspensory brachiators. Humans, in which the hand is used primarily for manipulation, have a low bone volume fraction and a variable degree of anisotropy. Finally, when trabecular parameters are mapped onto a molecular-based phylogeny, we show that the rates of change in trabecular structure vary across the hominoid clade. Our results support a link between inferred behaviour and trabecular structure in extant hominoids that can be informative for reconstructing behaviour in fossil primates.
The genus Unixenus Jones, 1944 (Diplopoda, Penicillata, Polyxenida) in Australia
Megan Short,Cuong Huynh
ZooKeys , 2011, DOI: 10.3897/zookeys.156.2168
Abstract: The penicillate genus Unixenus Jones, 1944 is widespread, with species found in Africa, Madagascar, India and Australia. Each of the two Australian species was originally described from single samples from Western Australia. In this study, collections of Penicillata from museums in all states of Australia were examined to provide further details of the two described species, to revise the diagnoses for both the genus and the species, and to better understand the distribution of the two species in Australia. In addition, two new species Unixenus karajinensis sp. n. and Unixenus corticolus sp. n. are described.
Corrigenda: Short M, Huynh C (2013) Four new species of Unixenus Jones, 1944 (Diplopoda, Penicillata, Polyxenida) from Australia. ZooKeys 278: 75–90, doi: 10.3897/zookeys.278.4765
Megan Short,Cuong Huynh
ZooKeys , 2013, DOI: 10.3897/zookeys.291.5284
Abstract: n/a
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