Minh Huynh - Academia.edu (original) (raw)

Papers by Minh Huynh

SSRN Electronic Journal, 2005

The Center for Retirement Research at Boston College, part of a consortium that includes a parall... more The Center for Retirement Research at Boston College, part of a consortium that includes a parallel centers at the University of Michigan and the National Bureau of Economic Research, was established in 1998 through a grant from the Social Security Administration. The goals of the Center are to promote research on retirement issues, to transmit new findings to the policy community and the public, to help train new scholars, and to broaden access to valuable data sources. Through these initiatives, the Center hopes to forge a strong link between the academic and policy communities around an issue of critical importance to the nation's future.

We present the IR luminosity function derived from ultra-deep 70 micron imaging of the GOODS-Nort... more We present the IR luminosity function derived from ultra-deep 70 micron imaging of the GOODS-North field. The 70 micron observations are longward of the PAH and silicate features which complicate work in the MIR. We derive far-infrared luminosities for the 143 sources with S_70 > 2 mJy (S/N > 3 σ). The majority (81 photometric redshifts are calculated for the remainder. The IR luminosity function at four redshifts (z 0.28, 0.48, 0.78, and 0.97) is derived and compared to the local one. There is considerable degeneracy between luminosity and density evolution. If the evolving luminosity function is described as ρ(L, z) = (1 + z)^q ρ(L/(1 + z)^p, 0), we find q = -2.19p + 6.09. In the case of pure luminosity evolution, we find a best fit of p = 2.78^+0.34_-0.32. This is consistent with the results from 24 micron and 1.4 GHz studies. Our results confirm the emerging picture of strong evolution in LIRGs and ULIRGs at 0.4 < z < 1.1, but we find no evidence of significant evolu...

We present 70 micron properties of submillimeter galaxies (SMGs) in the Great Observatories Origi... more We present 70 micron properties of submillimeter galaxies (SMGs) in the Great Observatories Origins Deep Survey (GOODS) North field. Out of thirty submillimeter galaxies (S_850 > 2 mJy) in the central GOODS-N region, we find two with secure 70 micron detections. These are the first 70 micron detections of SMGs. One of the matched SMGs is at z 0.5 and has S_70/S_850 and S_70/S_24 ratios consistent with a cool galaxy. The second SMG (z = 1.2) has infrared-submm colors which indicate it is more actively forming stars. We examine the average 70 micron properties of the SMGs by performing a stacking analysis, which also allows us to estimate that S_850 > 2 mJy SMGs contribute 9 +- 3 population as a whole is best fit by cool galaxies, and because of the redshifting effects these constraints are mainly on the lower z sub-sample. We fit Spectral Energy Distributions (SEDs) to the far-infrared data points of the two detected SMGs and the average low redshift SMG (z_median= 1.4). We fin...

We present MIPS 24 micron observations of the Hubble Deep Field South taken with the Spitzer Spac... more We present MIPS 24 micron observations of the Hubble Deep Field South taken with the Spitzer Space Telescope. The resulting image is 254 arcmin^2 in size and has a sensitivity ranging between 12 to 30 microJy rms, with a median sensitivity of 20 microJy rms. A total of 495 sources have been cataloged with a signal-to-noise ratio greater than 5 sigma. The source catalog is presented as well as source counts which have been corrected for completeness and flux boosting. The IR sources are then combined with MUSYC optical/NIR and ATHDFS radio observations to obtain redshifts and radio flux densities of the sample. We use the IR/radio flux density ratio (q_24) to explore the IR-radio correlation for this IR sample and find q_24 = 0.71 +- 0.31 for sources detected in both IR and radio. The results are extended by stacking IR sources not detected in the radio observations and we derive an average q_24 for redshift bins between 0 < z < 2.5. We find the high redshift (z > 1) sources...

The Australia Telescope Hubble Deep Field-South (ATHDF-S) survey of the Hubble Deep Field-South (... more The Australia Telescope Hubble Deep Field-South (ATHDF-S) survey of the Hubble Deep Field-South (HDF-S) reaches sensitivities of ∼10 µJy at 1.4, 2.5, 5.2, and 8.7 GHz, making the ATHDF-S one of the deepest surveys ever performed with the Australia Telescope Compact Array (ATCA). Here, we present the optical identifications of the ATHDF-S radio sources using data from the literature. We find that ∼66% of the radio sources have optical counterparts to I = 23.5 mag. Deep Hubble Space Telescope (HST) imaging of the area identifies a further 12% of radio sources. We present new spectroscopic observations for 98 of the radio sources and supplement these spectroscopic redshifts with photometric ones calculated from five-band optical imaging. The host galaxy colors and radio-to-optical ratios indicate that low-luminosity (or "radio-quiet") active galactic nuclei make up a significant proportion of the sub-mJy radio population, a result which is in accordance with a number of other deep radio studies. The radio-to-optical ratios of the bright (S 1.4 GHz > 1 mJy) sources are consistent with a bimodal distribution.

ii Statement of Authorship The candidate hereby declares that: Except where due acknowledgement h... more ii Statement of Authorship The candidate hereby declares that: Except where due acknowledgement has been made, the work is that of the candidate alone; the work has not been submitted previously, in whole or in part, to qualify for any other academic award; the content of the thesis is the result of the work which has been carried out since the official commencement date of the approved research program; any editorial work, paid or unpaid, carried out by a third party is acknowledged.

We present the IR luminosity function derived from ultra-deep 70µm imaging of the GOODS-North fie... more We present the IR luminosity function derived from ultra-deep 70µm imaging of the GOODS-North field. The 70 µm observations are longward of the PAH and silicate features which complicate work in the MIR. We derive far-infrared luminosities for the 143 sources with S 70 > 2 mJy (S/N > 3σ). The majority (81%) of the sources have spectroscopic redshifts, and photometric redshifts are calculated for the remainder. The IR luminosity function at four redshifts (z ∼ 0.28, 0.48, 0.78, and 0.97) is derived and compared to the local one. There is considerable degeneracy between luminosity and density evolution. If the evolving luminosity function is described as ρ(L, z) = (1 + z) q ρ(L/(1 + z) p , 0), we find q = −2.19p + 6.09. In the case of pure luminosity evolution, we find a best fit of p = 2.78 +0.34 −0.32. This is consistent with the results from 24µm and 1.4GHz studies. Our results confirm the emerging picture of strong evolution in LIRGs and ULIRGs at 0.4 < z < 1.1, but we find no evidence of significant evolution in the sub-LIRG (L < 10 11 L ⊙) population for z < 0.4.

Any opinions expressed here are those of the author(s) and not those of the institute. Research d... more Any opinions expressed here are those of the author(s) and not those of the institute. Research disseminated by IZA may include views on policy, but the institute itself takes no institutional policy positions. The Institute for the Study of Labor (IZA) in Bonn is a local and virtual international research center and a place of communication between science, politics and business. IZA is an independent nonprofit company supported by Deutsche Post World Net. The center is associated with the University of Bonn and offers a stimulating research environment through its research networks, research support, and visitors and doctoral programs. IZA engages in (i) original and internationally competitive research in all fields of labor economics, (ii) development of policy concepts, and (iii) dissemination of research results and concepts to the interested public. IZA Discussion Papers often represent preliminary work and are circulated to encourage discussion. Citation of such a paper shou...

ArXiv, 2018

Virtualization of network functions (as virtual routers, virtual firewalls, etc.) enables network... more Virtualization of network functions (as virtual routers, virtual firewalls, etc.) enables network owners to efficiently respond to the increasing dynamicity of network services. Virtual Network Functions (VNFs) are easy to deploy, update, monitor, and manage. The number of VNF instances, similar to generic computing resources in cloud, can be easily scaled based on load. Hence, auto-scaling (of resources without human intervention) has been receiving attention. Prior studies on auto-scaling use measured network traffic load to dynamically react to traffic changes. In this study, we propose a proactive Machine Learning (ML) based approach to perform auto-scaling of VNFs in response to dynamic traffic changes. Our proposed ML classifier learns from past VNF scaling decisions and seasonal/spatial behavior of network traffic load to generate scaling decisions ahead of time. Compared to existing approaches for ML-based auto-scaling, our study explores how the properties (e.g., start-up t...

We present MIPS 24 μm observations of the Hubble Deep Field South taken with the Spitzer Space Te... more We present MIPS 24 μm observations of the Hubble Deep Field South taken with the Spitzer Space Telescope. The resulting image is 254 arcmin2 in size and has a sensitivity ranging between ∼12 and ∼30 μJy rms, with a median sensitivity of ∼20 μJy rms. A total of 495 sources have been cataloged with a signal-to-noise ratio greater than 5σ . The source catalog is presented as well as source counts which have been corrected for completeness and flux boosting. The IR sources are then combined with MUSYC optical/NIR and ATHDFS radio observations to obtain redshifts and radio flux densities of the sample. We use the IR/radio flux density ratio (q24) to explore the IR–radio correlation for this IR sample and find q24 = 0.71 ± 0.31 for sources detected in both IR and radio. The results are extended by stacking IR sources not detected in the radio observations and we derive an average q24 for redshift bins between 0 < z < 2.5. We find that the high-redshift (z > 1) sources have an ave...

Background: Social media has grown into a prominent marketing and communication tool, and Instagr... more Background: Social media has grown into a prominent marketing and communication tool, and Instagram is a leader in this regard due to its distinctive supports for medial rich contents. Due to the challenges faced by Small-andmedium-enterprises (SMEs), they are suggested to embrace social media technology. Previous studies in Interactive value creation theory (IVF) indicated that SMEs-followers co-creation processes enable Instagram engagement. However, little is known of how to promote the value co-creation process via practical Instagram micro-practices that SMEs can employ regarding their constraints. This study is among the first to examine SMEs' practices for Instagram engagement via the process of value co-creation. Method: We collected data regarding Instagram engagements of 10 Australian SMEs in eight months period using Instagram API. Qualitative analysis is conducted based on 2110 contents in a Poisson regression model. Content analysis and time-series visualizations are employed to investigate the uniqueness of several outliners in the dataset. Results: Findings imply that SMEs should bank on @Tagging instead of #Hashtags to get more engagement as contents with @Tagging show higher levels of inclusiveness and trustworthiness. Also, customized postings for the locispecific audience effectively encourage followers to participate in conversations, while commercial intensive posting style shows adverse effects due to its low level of credibility. Rich media contents would not necessarily reel in more engagement; the commitment and consistent postings amassed a considerable number of followers over time, leading to a higher engagement rate. Conclusions: This study confirmed the benefits of data scraping in building business intelligence and validate the IVF framework as the theoretical background to investigate the effectiveness of Instagram micro-practices. IVF should be considered in designing social media practices to enable SMEs and followers' collaborations for business value generation. This study provides extra interpretations of the interrelationships between IVF, visual-rich contents, and social media engagement.

We use deep far-IR, submillimeter, radio, and X-ray imaging and mid-IR spectroscopy to explore th... more We use deep far-IR, submillimeter, radio, and X-ray imaging and mid-IR spectroscopy to explore the nature of a sample of Spitzer-selected dust-obscured galaxies (DOGs) in GOODS-N. A sample of 79 galaxies satisfy the criteria R 1⁄224 > 14 (Vega) down to S24 > 100 Jy (median flux density S24 1⁄4 180 Jy). Twelve of these galaxies have IRS spectra available, which we use to measure redshifts and classify these objects as being dominated by star formation or active galactic nucleus (AGN) activity in the mid-IR. The IRS spectra and Spitzer photometric redshifts confirm that the DOGs lie in a tight redshift distribution around z 2. Based on mid-IR colors, 80% of DOGs are likely dominated by star formation; the stackedX-ray emission from this subsample of DOGs is also consistentwith star formation. Since only a small number of DOGs are individually detected at far-IR and submillimeter wavelengths, we use a stacking analysis to determine the average flux from these objects and plot a c...

Proceedings of Panoramic Radio Astronomy: Wide-field 1-2 GHz research on galaxy evolution — PoS(PRA2009), 2010

Proceedings of Advancing Astrophysics with the Square Kilometre Array — PoS(AASKA14), 2015

Revista Española de Enfermedades Digestivas, 2018

Low phospholipid-associated cholelithiasis and intrahepatic cholestasis of pregnancy are two MDR3... more Low phospholipid-associated cholelithiasis and intrahepatic cholestasis of pregnancy are two MDR3-related inherited liver disorders caused by biallelic or monoallelic ABCB4 loss-of-function variants. Low phospholipid-associated cholelithiasis is clinically characterized by the early onset of symptomatic cholelithiasis in young adults while intrahepatic cholestasis of pregnancy is a distinct clinical entity associated with adverse fetal outcomes. Of note, patients carrying ABCB4 sequence variations commonly exhibit phenotypic expression over a wide continuum due to environmental and hormonal contributing factors and genetic modifiers. Patients with an early diagnosis of MDR3-related diseases could benefit from ursodeoxycholic acid treatment in order to prevent acute and chronic complications as well as adverse pregnancy outcomes. We herein report five patients with an overlapping phenotype from low phospholipid-associated cholelithiasis to intrahepatic cholestasis of pregnancy, harboring five ABCB4 missense variants, four of which were novel. Our study highlights the phenotypic and genetic heterogeneity of inherited cholestatic liver diseases and also expands the mutation spectrum of ABCB4 sequence variations in adult cholestatic liver diseases.

Journal of cerebral blood flow and metabolism : official journal of the International Society of Cerebral Blood Flow and Metabolism, 2017

The high metabolic demand of neuronal tissue, coupled with its relatively low energy storage capa... more The high metabolic demand of neuronal tissue, coupled with its relatively low energy storage capacity, requires that increases in neuronal activation are quickly matched with increased blood flow to ensure efficient supply of oxygen and nutrients to the tissue. For this to occur, dilation of nearby arterioles must be coordinated with the dilation of larger upstream feeding arteries. As it stands, the exact spatial extent of such dilation in humans is unknown. Using non-invasive time-of-flight magnetic resonance angiography in healthy participants, we developed an automatic methodology for reconstructing cerebral arterial vessels and quantifying their diameter on a voxel-by-voxel basis. Specifically, we isolated the posterior cerebral artery (PCA) supplying each occipital lobe and quantified its vasodilation induced by visual stimulation. Stimulus-induced changes were strongest (∼30%) near primary visual cortex and progressively decreased in a non-linear fashion as a function of dist...

European Radiology, 2016

Objectives To compare the image quality between fine focal spot size (FFSS) and standard focal sp... more Objectives To compare the image quality between fine focal spot size (FFSS) and standard focal spot size (SFSS) in computed tomography of the abdomen and pelvis (CTAP) Methods This retrospective review included all consecutive adult patients undergoing contrast-enhanced CTAP between June and September 2014. Two blinded radiologists assessed the margin clarity of the abdominal viscera and the detected lesions using a five-point grading scale. Cohen's kappa test was used to examine the inter-observer reliability between the two reviewers for organ margin clarity. Mann-Whitney U testing was utilised to assess the statistical difference of the organ and lesion margin clarity. Results 100 consecutive CTAPs were recruited. 52 CTAPs were examined with SFSS of 1.1 × 1.2 mm and 48 CTAPs were examined with FFSS of 0.6 × 0.7 mm. Results showed that there was substantial agreement for organ margin clarity (mean κ = 0.759, p < 0.001) among the reviewers. FFSS produces images with clearer organ margins (U = 76194.0, p < 0.001, r = 0.523) and clearer lesion margins (U = 239, p = 0.052, r = 0.269). Conclusion FFSS CTAP improves image quality in terms of better organ and lesion margin clarity. Fine focus CT scanning is a novel technique that may be applied in routine CTAP imaging. Key Points • Fine focal spot improves organ margin clarity. • Fine focal spot improves lesion margin clarity. • Fine focal spot can be used in routine CT abdominal imaging. Keywords Fine focal spot. CT abdomen and pelvis. Margin clarity. High-resolution imaging. Low radiation dose Abbreviations FFSS Fine focal spot size SFSS Standard focal spot size CT Computed tomography CTAP Computed tomography of the abdomen and pelvis DLP Dose length product

The Square Kilometre Array (SKA) will be the premier instrument to study radiation at centimetre ... more The Square Kilometre Array (SKA) will be the premier instrument to study radiation at centimetre and metre wavelengths from the cosmos, and in particular hydrogen, the most abundant element in the universe. The SKA will probe the dawn of galaxy formation as well as allow advances in many other areas of astronomy, such as fundamental physics, astrobiology and cosmology. Phase 1, which will be about 10% of the full SKA collecting area, will be built in Australia and South Africa. This paper describes the key science drivers of the SKA, provides an update on recent SKA Organisation activities and summarises the baseline design for Phase 1.

The veterinary clinics of North America. Exotic animal practice, 2015

Gastrointestinal disease is a common complaint in ferrets (Mustela putorius furo). Their relative... more Gastrointestinal disease is a common complaint in ferrets (Mustela putorius furo). Their relatively simple and short gastrointestinal tract makes them good candidates for flexible endoscopy. However, apart from a few references in biomedical research articles, there is little information on the use of flexible endoscopy in ferrets. This review describes patient preparation, equipment, and select gastrointestinal endoscopy techniques in ferrets, including esophagoscopy, gastroscopy, duodenoscopy, percutaneous endoscopic gastrostomy, jejunoileoscopy, colonoscopy, and biopsy.

Molecular Genetics and Metabolism, 2015

The recessive wellhaarig (we) mutations, named for the wavy coat and curly whiskers they generate... more The recessive wellhaarig (we) mutations, named for the wavy coat and curly whiskers they generate in homozygotes, have previously been mapped on mouse Chromosome 2. To further limit the possible location of the we locus, we crossed hybrid (C57BL/6 x AKR)F 1 , we 4J /+ females with AKR, we 4J /we 4J mutant males to create a large backcross family that was typed for various microsatellite markers and single-nucleotide polymorphisms (SNPs) that distinguish strains AKR and B6. This analysis restricted the location of we 4J between sites that flank only one gene known to be expressed in skin: epidermal-type transglutaminase 3 (Tgm3). To test Tgm3 as a candidate for the basis of the wellhaarig phenotype we took two approaches. First, we sequenced all Tgm3 coding regions in mice homozygous for four independent, naturally-occurring wellhaarig alleles (we, we Bkr , we 3J and we 4J) and found distinct defects in three of these mutants. Second, we crossed mice homozygous for an induced mutant allele of Tgm3 (Tgm3 Btlr) with mice heterozygous for one of the wellhaarig alleles we possess (we 4J or we Bkr) to test for complementation. Because the progeny inheriting both a recessive we allele and a recessive Tgm3 Btlr allele displayed wavy hair, we conclude that the classic wellhaarig mutations result from defects in Tgm3.