Papers by Anh Thi Minh Nguyen
generously offered his time to advise all aspects of this project. Thank you to Dave Harding for ... more generously offered his time to advise all aspects of this project. Thank you to Dave Harding for his keen insights, reminder of the bigger picture, and gentle nudge. I have learned and benefitted immensely from working closely with them both. Thank you to Al Young, Jr. for challenging me to think more critically about the theoretical and policy implications of this work. Thank you to Ingrid Binswanger for her expertise and critical insights, and for emphasizing the importance of connecting research and practice. Thank you to Heather Thompson for pushing me to consider the historical roots of this research as well as its implications for social change. I also thank my mentors from Carleton-Adrienne Falcón, Pamela Feldman-Savelsberg, and Bill North-who have continued to support me long after my time there. Thank you to my colleagues and friends at Michigan-Nell Compernolle, Min Hee Kim, Nelson Saldaña, and Kennedy Turner-for their thoughtful comments, insights, and advice. Nell and Nelson provided feedback since the inception of this project. Thank you to Wing Lam for being there from the very beginning of it all. Finally, thank you to my family for their wavering support and sacrifices that made this journey possible.
Proceedings of the 9th ACM international symposium on Mobility management and wireless access, 2011
This paper introduces Swarm-based Intelligent Routing (SIR), a swarm intelligence based approach ... more This paper introduces Swarm-based Intelligent Routing (SIR), a swarm intelligence based approach used for routing content in content centric Pocket Switched Networks. We first formalize the notion of optimal path in DTN, then introduce a swarm intelligence based routing protocol adapted to content centric DTN that use a publish/subscribe communication paradigm. The protocol works in a fully decentralized way in which nodes do not have any knowledge about the global topology. Nodes, via opportunistic contacts, update utility functions which synthesizes their spatiotemporal proximity from the content subscribers. This individual behavior applied by each node leads to the collective formation of gradient fields between content subscribers and content providers. Therefore, content routing simply sums up to follow the steepest slope along these gradient fields to reach subscribers who are located at the minima of the field. Via real traces analysis and simulation, we demonstrate the existence and relevance of such gradient field and show routing performance improvements when compared to classical routing protocols previously defined for information routing in DTN.
Molecular Ecology Notes, 2007
We describe polymerase chain reaction primers that consistently amplify three intron regions of a... more We describe polymerase chain reaction primers that consistently amplify three intron regions of approximately 2 kb in total length for two nuclear protein-coding genes (ATP synthase beta subunit and elongation factor-1 alpha subunit) in sea stars of the family Asteriidae. The introns are moderately polymorphic at the species level (average withinspecies percentage of site differences = 0.42%, range 0-1.44%), are evolving at about 29% as fast as mitochondrial sequences in the same species and are alignable at the genus or family level, making them suitable for phylogenetic and population genetic analyses.
List of Figures 2.1 (a) Human mobility modeling under a markovian view: States represent differen... more List of Figures 2.1 (a) Human mobility modeling under a markovian view: States represent different localities, e.g., House, Office, Shop and Other places, and transitions represent the mobility pattern.
This paper investigates the transition from high school to first job using data from the National... more This paper investigates the transition from high school to first job using data from the National Education Longitudinal Study 1988-2000. A proportional hazards model is estimated to identify the determinants of time-to-first-job. In contrast to earlier studies, there is strong evidence of positive duration dependence after controlling for unobserved heterogeneity. Time-to-first-job is correlated with educational attainment and type of school program attended. Attending a vocational program reduces time-to-first-job, but dropouts who obtain the General Educational Development qualification as an alternative to high school graduation do not improve their chances of getting a job more quickly. Family background is insignificant.
SSRN Electronic Journal, 2005
This paper argues that the value added score published for all publicly funded secondary schools ... more This paper argues that the value added score published for all publicly funded secondary schools in England is an unreliable indicator of school performance. A substantial proportion of the between-school variation in the value added score is accounted for by factors outside of the school's control. These factors include several pupil-related variables such as the proportion of pupils on free school meals, the authorised absence rate of pupils and the proportion of pupils from ethnic minority backgrounds. The value added score is also related to several school characteristics such as the school's admissions policy and its subject specialism. The main policy recommendation of this paper is that the value added score should not be used as a performance indicator, but should be used to gain a better understanding of why value added varies between schools.
2011 IEEE Ninth International Conference on Dependable, Autonomic and Secure Computing, 2011
This paper introduces a Swarm-Intelligence based Routing protocol (SIR) that aims to efficiently ... more This paper introduces a Swarm-Intelligence based Routing protocol (SIR) that aims to efficiently route information in content centric Delay Tolerant Networks (CCDTN) also dubbed pocket switched networks. First, this paper formalizes the notion of optimal path in CCDTN and introduces an original and efficient algorithm to process these paths in dynamic graphs. The properties and some invariant features of these optimal paths are analyzed and derived from several real traces. Then, this paper shows how optimal path in CCDTN can be found and used from a fully distributed swarm-intelligence based approach of which the global intelligent behavior (i.e. shortest path discovery and use) emerges from simple peer to peer interactions applied during opportunistic contacts. This leads to the definition of the SIR routing protocol of which the consistency, efficiency and performances are demonstrated from intensive representative simulations.
Proceedings of the 2013 ACM SIGCOMM workshop on Future human-centric multimedia networking, 2013
Human-Centric DTNs exhibit some degree of regularity on their temporal contact patterns [1]. The ... more Human-Centric DTNs exhibit some degree of regularity on their temporal contact patterns [1]. The impact of this regularity on network performances has not been well studied and analyzed. In this paper, we study this temporal dimension of Human-Centric DTNs and its impacts on routing performances. We propose a simple parametric network model which covers the full spectrum of contact patterns from strictly periodic to fully random ones. Based on this model, we study the impact of contact patterns regularity on routing performances and we show how to exploit the temporal structure to navigate with a good resource/performance tradeoff in Human-Centric DTNs. Simulation and analytical analysis show that efficient routing with respect to their degree of regularity emerge within a subset of dynamic networks. Moreover, we show there is a specific degree of regularity where routing performance achieves its optimum.
Lecture Notes in Computer Science, 2011
In this paper we introduce Spatio-TEmporal Parametric Stepping (STEPS)-a simple parametric mobili... more In this paper we introduce Spatio-TEmporal Parametric Stepping (STEPS)-a simple parametric mobility model which can cover a large spectrum of human mobility patterns. STEPS makes abstraction of spatio-temporal preferences in human mobility by using a power law to rule the nodes movement. Nodes in STEPS have preferential attachment to favorite locations where they spend most of their time. Via simulations, we show that STEPS is able, not only to express the peer to peer properties such as inter-contact/contact time and to reflect accurately realistic routing performance, but also to express the structural properties of the underlying interaction graph such as small-world phenomenon. Moreover, STEPS is easy to implement, flexible to configure and also theoretically tractable.
Scottish Journal of Political Economy, 2005
This paper uses the traditional income framework and a non-monetary framework to estimate interge... more This paper uses the traditional income framework and a non-monetary framework to estimate intergenerational mobility in economic status for a sample of 26 year-old whites, blacks and Hispanics in the USA using data from the first and fifth sweeps of the National Educational Longitudinal Study (1988 and 2000). Intergenerational income mobility is found to be greater for females than for males, though there are differences between whites, blacks and Hispanics. Transition probabilities indicate that Hispanics are the most upwardly mobile in terms of educational attainment and occupational status. Ordered logits are used to estimate the impact of parental education and occupation on educational and occupational outcomes.
Plastic and Reconstructive Surgery, 2011
Letters to the Editor, discussing material recently published in the Journal, are welcome. They w... more Letters to the Editor, discussing material recently published in the Journal, are welcome. They will have the best chance of acceptance if they are received within 8 weeks of an article's publication. Letters to the Editor may be published with a response from the authors of the article being discussed. Discussions beyond the initial letter and response will not be published. Letters submitted pertaining to published Discussions of articles will not be printed. Letters to the Editor are not usually peer reviewed, but the Journal may invite replies from the authors of the original publication. All Letters are published at the discretion of the Editor. Letters submitted should pose a specific question that clarifies a point that either was not made in the article or was unclear, and therefore a response from the corresponding author of the article is requested.
Plant Biology, 2008
We report the identification of novel defence genes in canola by using a cDNA microarray from Ara... more We report the identification of novel defence genes in canola by using a cDNA microarray from Arabidopsis. We examined changes that occur in the abundance of transcripts corresponding to 2375 Arabidopsis expressed sequence tags (selected for defence gene identification) following inoculation of canola plants with the fungal necrotrophic leaf pathogen, Alternaria brassicicola. Microarray data obtained from this cross-hybridisation experiment were compared to expression profiles previously obtained from the equivalent Arabidopsis experiment. Homology searches using a canola expressed sequence tag database with 6000 unique clones led to identification of canola defence genes. Pathogen-responsive transcripts included those associated to known defence genes, reactive oxygen species metabolism, disease resistance and regulatory genes, and cell maintenance ⁄ metabolism genes. Using specific primers for quantitative real-time reverse transcriptase PCR, gene expression profiles in canola were obtained that demonstrated coordinated defence responses, including systemic responses in distal tissue and salicylic acid-and methyl jasmonate-mediated signalling against A. brassicicola.
PloS one, 2011
We used a microarray study in order to compare the time course expression profiles of two Chlamyd... more We used a microarray study in order to compare the time course expression profiles of two Chlamydomonas reinhardtii strains, namely the high H₂ producing mutant stm6glc4 and its parental WT strain during H₂ production induced by sulfur starvation. Major cellular reorganizations in photosynthetic apparatus, sulfur and carbon metabolism upon H₂ production were confirmed as common to both strains. More importantly, our results pointed out factors which lead to the higher H₂ production in the mutant including a higher starch accumulation in the aerobic phase and a lower competition between the H₂ase pathway and alternative electron sinks within the H₂ production phase. Key candidate genes of interest with differential expression pattern include LHCSR3, essential for efficient energy quenching (qE). The reduced LHCSR3 protein expression in mutant stm6glc4 could be closely related to the high-light sensitive phenotype. H₂ measurements carried out with the LHCSR3 knock-out mutant npq4 howe...
Journal of Population Economics, 2003
A multinomial logit model is estimated to investigate the destination of students one-year after ... more A multinomial logit model is estimated to investigate the destination of students one-year after graduating from high school. The appropriate specification of the choice set available to high school leavers is as follows: private four-year college, public four-year college, private two-year college, public two-year college, employed and unemployed. We test for several possible combinations of these choices and find that these pooled models are all rejected in favour of the full model. The transition from high school to college and to work is more complex than previous studies have recognised.
Eukaryotic Cell, 2008
Photobiological hydrogen production using microalgae is being developed into a promising clean fu... more Photobiological hydrogen production using microalgae is being developed into a promising clean fuel stream for the future. In this study, microarray analyses were used to obtain global expression profiles of mRNA abundance in the green alga Chlamydomonas reinhardtii at different time points before the onset and during the course of sulfur-depleted hydrogen production. These studies were followed by real-time quantitative reverse transcription-PCR and protein analyses. The present work provides new insights into photosynthesis, sulfur acquisition strategies, and carbon metabolism-related gene expression during sulfur-induced hydrogen production. A general trend toward repression of transcripts encoding photosynthetic genes was observed. In contrast to all other LHCBM genes, the abundance of the LHCBM9 transcript (encoding a major light-harvesting polypeptide) and its protein was strongly elevated throughout the experiment. This suggests a major remodeling of the photosystem II light-...
Education Economics, 2008
We investigate the determinants of high school students' academic attainment in maths, reading an... more We investigate the determinants of high school students' academic attainment in maths, reading and science; focusing particularly on possible effects that ethnicity and family background may have on attainment. Using data from the NELS2000 and employing quantile regression techniques, we find two important results. First, the gaps in maths, reading and science test scores among ethnic groups vary across the conditional quantiles of the measured test scores. Specifically, Blacks and Hispanics tend to fare worse in their attainment at higher quantiles, particularly in science. Secondly, the effects of family background factors such as parental education and father's occupation also vary across quantiles of the test score distribution. The implication of these findings is that the commonly made broad distinction on whether one is from a privileged/disadvantaged ethnic and/or family background may not tell the whole story that the academic attainment discourse has to note. Interventions aimed at closing the gap in attainment between Whites and minorities may need to target higher levels of the test score distribution.
Bulletin of Economic Research, 2006
... Email: [email protected]. The authors are grateful to two referees and the editor fo... more ... Email: [email protected]. The authors are grateful to two referees and the editor for helpful comments and suggestions on an earlier version of this paper. Anh Nguyen is grateful to the ESRC for its financial support under its post-doctoral awards scheme. 285 Page 2. ...
We investigate the determinants of high school students’ academic attainment in maths, reading an... more We investigate the determinants of high school students’ academic attainment in maths, reading and science; focusing particularly on possible effects that ethnicity and family background may have on attainment. Using data from the NELS2000 and employing quantile regression techniques, we find two important results. First, the gaps in maths, reading and science test scores among ethnic groups vary across the conditional quantiles of the measured test scores. Specifically, Blacks and Hispanics tend to fare worse in their attainment at higher quantiles, particularly in science. Secondly, the effects of family background factors such as parental education and father’s occupation also vary across quantiles of the test score distribution. The implication of these findings is that the commonly made broad distinction on whether one is from a privileged/disadvantaged ethnic and/or family background may not tell the whole story that the academic attainment discourse has to note. Interventions...
Uploads
Papers by Anh Thi Minh Nguyen