1,839 results on '"Lee, Dennis"'
Search Results
2. Magnetic Field Alignment Relative to Multiple Tracers in the High-mass Star-forming Region RCW 36
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Bij, Akanksha, Fissel, Laura M., Bonne, Lars, Schneider, Nicola, Berthoud, Marc, Lee, Dennis, Novak, Giles A., Sadavoy, Sarah I., Pillai, Thushara G. S., Cunningham, Maria, Jones, Paul, and Simon, Robert
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Astrophysics - Astrophysics of Galaxies ,Astrophysics - Solar and Stellar Astrophysics - Abstract
We use polarization data from SOFIA HAWC+ to investigate the interplay between magnetic fields and stellar feedback in altering gas dynamics within the high-mass star-forming region RCW 36, located in Vela C. This region is of particular interest as it has a bipolar HII region powered by a massive star cluster which may be impacting the surrounding magnetic field. To determine if this is the case, we apply the Histogram of Relative Orientations (HRO) method to quantify the relative alignment between the inferred magnetic field and elongated structures observed in several datasets such as dust emission, column density, temperature, and spectral line intensity maps. The HRO results indicate a bimodal alignment trend, where structures observed with dense gas tracers show a statistically significant preference for perpendicular alignment relative to the magnetic field, while structures probed by photo-dissociation region (PDR) tracers tend to align preferentially parallel relative to the magnetic field. Moreover, the dense gas and PDR associated structures are found to be kinematically distinct such that a bimodal alignment trend is also observed as a function of line-of-sight velocity. This suggests that the magnetic field may have been dynamically important and set a preferred direction of gas flow at the time that RCW 36 formed, resulting in a dense ridge developing perpendicular to the magnetic field. However on filament-scales near the PDR region, feedback may be energetically dominating the magnetic field, warping its geometry and the associated flux-frozen gas structures, causing the observed the preference for parallel relative alignment., Comment: 40 pages (25 pages main paper, 15 pages appendix), 24 figures, 5 tables, accepted for publication in ApJ
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- 2024
3. Keyhole-shaped Tombs in the Yŏngsan River Basin: A Reflection of Paekche-Yamato Relations in the Late Fifth.Early Sixth Century
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Lee, Dennis
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- 2020
4. Modeling the Far-Infrared Polarization Spectrum of a High-Mass Star Forming Cloud
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Lee, Dennis, Chen, Che-Yu, Novak, Giles, Chuss, David T., Cox, Erin G., Karpovich, Kaitlyn, Ashton, Peter, Berthoud, Marc, Li, Zhi-Yun, and Michail, Joseph M.
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Astrophysics - Astrophysics of Galaxies ,Astrophysics - Solar and Stellar Astrophysics - Abstract
The polarization spectrum, or wavelength dependence of the polarization fraction, of interstellar dust emission provides important insights into the grain alignment mechanism of interstellar dust grains. We investigate the far-infrared polarization spectrum of a realistic simulated high-mass star forming cloud under various models of grain alignment and emission. We find that neither a homogeneous grain alignment model nor a grain alignment model that includes collisional dealignment is able to produce the falling spectrum seen in observations. On the other hand, we find that a grain alignment model with grain alignment efficiency dependent on local temperature is capable of producing a falling spectrum that is in qualitative agreement with observations of OMC-1. For the model most in agreement with OMC-1, we find no correlation between temperature and the slope of the polarization spectrum. However, we do find a positive correlation between column density and the slope of the polarization spectrum. We suggest this latter correlation to be the result of wavelength-dependent polarization by absorption., Comment: 14 pages, 6 figures, 2 tables; Accepted to ApJ
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- 2024
5. Paekche King Kŭnch'ogo's Twisted Journey to the South: A Textual and Archaeological Perspective
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Lee, Dennis
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- 2019
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6. Early Korea: Re-thinking Boundaries and Identities
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Davey, Jack and Lee, Dennis
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- 2019
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7. Magnetic Fields Observed along the E-W Outflow of IRAS 16293-2422
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Encalada, Frankie J., Looney, Leslie W., Novak, Giles, Sadavoy, Sarah, Cox, Erin G., Pereira-Santos, Fabio, Lee, Dennis, Harrison, Rachel, and Pattle, Kate
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Astrophysics - Solar and Stellar Astrophysics ,Astrophysics - Astrophysics of Galaxies - Abstract
Magnetic fields likely play an important role in the formation of young protostars. Multiscale and multiwavelength dust polarization observations can reveal the inferred magnetic field from scales of the cloud to core to protostar. We present continuum polarization observations of the young protostellar triple system IRAS 16293-2422 at 89 $\mu$m using HAWC+ on SOFIA. The inferred magnetic field is very uniform with an average field angle of 89$^\circ\pm$23$^\circ$ (E of N), which is different from the $\sim$170$^\circ$ field morphology seen at 850 $\mu$m at larger scales (> 2000 au) with JCMT POL-2 and at 1.3 mm on smaller scales (< 300 au) with ALMA. The HAWC+ magnetic field direction is aligned with the known E-W outflow. This alignment difference suggests that the shorter wavelength HAWC+ data is tracing the magnetic field associated with warmer dust likely from the outflow cavity, whereas the longer wavelength data are tracing the bulk magnetic field from cooler dust. Also, we show in this source the dust emission peak is strongly affected by the observing wavelength. The dust continuum peaks closer to source B (northern source) at shorter wavelengths and progressively moves toward the southern A source with increasing wavelength (from 22 $\mu$m to 850 $\mu$m)., Comment: 10 pages, 5 figures. Accepted to ApJ
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- 2024
8. Nine Poets
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Blostein, David, Moritz, A. F., Reibetanz, John, Crozier, Lorna, Zwicky, Jan, Patrice Thibodeau, Serge, Elliott Clarke, George, Lee, Dennis, Bringhurst, Robert, and McBurney, Ward
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- 2012
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9. NASA's Cold Atom Laboratory: Four Years of Quantum Science Operations in Space
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Oudrhiri, Kamal, Kohel, James M., Harvey, Nate, Kellogg, James R., Aveline, David C., Butler, Roy L., Bosch-Lluis, Javier, Callas, John L., Cheng, Leo Y., Croonquist, Arvid P., Dula, Walker L., Elliott, Ethan R., Fernandez, Jose E., Gonzales, Jorge, Higuera, Raymond J., Javidnia, Shahram, Kwan, Sandy M., Lay, Norman E., Lee, Dennis K., Li, Irena, Miles, Gregory J., Pauken, Michael T., Perry, Kelly L., Phillips, Leah E., Malarik, Diane C., Griffin, DeVon W., Carpenter, Bradley M., Robinson, Michael P., Rees, Kirt Costello Sarah K., Sbroscia, Matteo S., Schneider, Christian, Shotwell, Robert F., Shin, Gregory Y., Tran, Cao V., William, Michel E., Williams, Jason R., Yang, Oscar, Yu, Nan, and Thompson, Robert J.
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Quantum Physics ,Condensed Matter - Quantum Gases - Abstract
The Cold Atom Laboratory (CAL) is a quantum facility for studying ultra-cold gases in the microgravity environment of the International Space Station. It enables research in a temperature regime and force-free environment inaccessible to terrestrial laboratories. In the microgravity environment, observation times over a few seconds and temperatures below 100 pK are achievable, unlocking the potential to observe new quantum phenomena. CAL launched to the International Space Station in May 2018 and has been operating since then as the world's first multi-user facility for studying ultra\-cold atoms in space. CAL is the first quantum science facility to produce the fifth state of matter called a Bose-Einstein condensate with rubidium-87 and potassium-41 in Earth orbit. We will give an overview of CAL's operational setup, outline its contributions to date, present planned upgrades for the next few years, and consider design choices for microgravity BEC successor-mission planning., Comment: 13 pages, 7 figures. Presented at SpaceOps 2023 Conference
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- 2023
10. Mendelian or Multifactorial? Current Undergraduate Genetics Assessments Focus on Genes and Rarely Include the Environment
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Schmid, Kelly M., Lee, Dennis, Weindling, Monica, Syed, Awais, Agyemang, Stephanie-Louise Yacoba, Donovan, Brian, Radick, Gregory, and Smith, Michelle K.
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Undergraduate genetics courses have historically focused on simple genetic models, rather than taking a more multifactorial approach where students explore how traits are influenced by a combination of genes, the environment, and gene-by-environment interactions. While a focus on simple genetic models can provide straightforward examples to promote student learning, they do not match the current scientific understanding and can result in deterministic thinking among students. In addition, undergraduates are often interested in complex human traits that are influenced by the environment, and national curriculum standards include learning objectives that focus on multifactorial concepts. This research aims to discover to what extent multifactorial genetics is currently being assessed in undergraduate genetics courses. To address this, we analyzed over 1,000 assessment questions from a commonly used undergraduate genetics textbook; published concept assessments; and open-source, peer-reviewed curriculum materials. Our findings show that current genetics assessment questions overwhelmingly emphasize the impact of genes on phenotypes and that the effect of the environment is rarely addressed. These results indicate a need for the inclusion of more multifactorial genetics concepts, and we suggest ways to introduce them into undergraduate courses.
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- 2022
11. The Twisted Magnetic Field of the Protobinary L483
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Cox, Erin G., Novak, Giles, Sadavoy, Sarah, Looney, Leslie W., Lee, Dennis, Berthoud, Marc, Bourke, Tyler L., Coudé, Simon, Encalada, Frankie, Fissel, Laura M., Harrison, Rachel, Houde, Martin, Li, Zhi-Yun, Myers, Philip C., Pattle, Kate, Santos, Fabio P., Stephens, Ian W., Wang, Hailin, and Wolf, Sebastian
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Astrophysics - Solar and Stellar Astrophysics ,Astrophysics - Astrophysics of Galaxies - Abstract
We present H-band (1.65 $\mu$m) and SOFIA HAWC+ 154 $\mu$m polarization observations of the low-mass core L483. Our H-band observations reveal a magnetic field that is overwhelmingly in the E-W direction, which is approximately parallel to the bipolar outflow that is observed in scattered IR light and in single-dish $^{12}$CO observations. From our 154 $\mu$m data, we infer a $\sim$ 45$^{\circ}$ twist in the magnetic field within the inner 5" (1000 au) of L483. We compare these new observations with published single-dish 350 $\mu$m polarimetry and find that the 10,000 au scale H-band data match the smaller scale 350 $\mu$m data, indicating that the collapse of L483 is magnetically regulated on these larger scales. We also present high-resolution 1.3 mm ALMA data of L483 which reveals it is a close binary star with a separation of 34 au. The plane of the binary of L483 is observed to be approximately parallel to the twisted field in the inner 1000 au. Comparing this result to the $\sim$ 1000 au protostellar envelope, we find that the envelope is roughly perpendicular to the 1000 au HAWC+ field. Using the data presented, we speculate that L483 initially formed as a wide binary and the companion star migrated to its current position, causing an extreme shift in angular momentum thereby producing the twisted magnetic field morphology observed. More observations are needed to further test this scenario., Comment: Accepted for publication in ApJ
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- 2022
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12. Cytokeratin 15 is a novel and independent predictor of poor outcome in luminal B HER2-negative breast carcinomas
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Lee, Dennis H.Y., Tsang, Julia Y., Li, Joshua J.X., Lau, Sin Leung, Tam, Fiona, Loong, Thomson C., and Tse, Gary M.
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- 2024
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13. Consensus-driven target product profiles for curative sickle cell disease gene therapies
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Bukini, Daima, Makani, Julie, McCune, Joseph, Lee, Dennis, Bansbach, Cathy, De Vita, Serena, Kemps, Dominic, Amin, Elianna, Spector, Jonathan, and Tisdale, John
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- 2024
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14. Psychometrics of the breastfeeding self-efficacy scale and short form: a systematic review
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Cindy-Lee Dennis, Karen McQueen, Justine Dol, Hilary Brown, Cheryl Beck, and Shefaly Shorey
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Breastfeeding self-efficacy ,Systematic review ,Psychometric evaluation ,Public aspects of medicine ,RA1-1270 - Abstract
Abstract Background The Breastfeeding Self-Efficacy Scale and its short-form were developed in Canada and have been used internationally among numerous maternal populations. However, the psychometric properties of the scales have not been reviewed to confirm their appropriateness in measuring breastfeeding self-efficacy in culturally diverse populations. The purpose of this research was to critically appraise and synthesize the psychometric properties of the scales via systematic review. Methods The Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines were followed. Three databases (EMBASE, MEDLINE, and PsycINFO) were searched from 1999 (original publication of the Scale) until April 27, 2022. The search was updated on April 1, 2023. Studies that assessed the psychometric properties of the BSES or BSES-SF were included. Two researchers independently extracted data and completed the quality appraisals. Results Forty-one studies evaluated the psychometrics of the BSES (n = 5 studies) or BSES-SF (n = 36 studies) among demographically or culturally diverse populations. All versions of the instrument demonstrated good reliability, with Cronbach's alphas ranging from .72 to .97. Construct validity was supported by statistically significant differences in mean scores among women with and without previous breastfeeding experience and by correlations between the scales and theoretically related constructs. Predictive validity was demonstrated by statistically significant lower scores among women who ultimately discontinued breastfeeding compared to those who did not. Conclusion The BSES and BSES-SF appear to be valid and reliable measures of breastfeeding self-efficacy that may be used globally to (1) assess women who may be at risk of negative breastfeeding outcomes (e.g., initiation, duration and exclusivity), (2) individualize breastfeeding support, and (3) evaluate the effectiveness of breastfeeding interventions.
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- 2024
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15. Maternal disability and initiation and duration of breastfeeding: analysis of a Canadian cross-sectional survey
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Hilary K. Brown, Lesley Pablo, Natalie V. Scime, Amira M. Aker, and Cindy-Lee Dennis
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Breastfeeding ,Cross-sectional studies ,Disabled persons ,Health equity ,Health surveys ,Pediatrics ,RJ1-570 ,Public aspects of medicine ,RA1-1270 - Abstract
Abstract Background The World Health Organization recommends breastfeeding as the best method for infant feeding. Known risk factors for breastfeeding non-initiation and early cessation of breastfeeding are diverse and include low breastfeeding self-efficacy, poverty, smoking, obesity, and chronic illness. Although women with disabilities experience elevated rates of these risk factors, few studies have examined their breastfeeding outcomes. Our objective was to examine breastfeeding non-initiation and early cessation of breastfeeding in women with and without disabilities. Methods We used data from the 2017–2018 Canadian Community Health Survey. Included were n = 4,817 women aged 15–55 years who had a birth in the last five years, of whom 26.6% had a disability, ascertained using the Washington Group Short Set on Functioning. Prevalence ratios (aPR) of breastfeeding non-initiation, and of early cessation of any and exclusive breastfeeding before 6 months, were calculated for women with versus without disabilities. We also examined disability by severity (moderate/severe and mild, separately) and number of action domains impacted (≥ 2 and 1, separately). The main multivariable models were adjusted for maternal age, marital status, level of education, annual household income level, and immigrant status. Results There were no differences between women with and without disabilities in breastfeeding non-initiation (9.6% vs. 8.9%; aPR 0.88, 95% CI 0.63, 1.23). Women with disabilities were more likely to have early cessation of any (44.4% vs. 35.7%) and exclusive breastfeeding before 6 months (66.9% vs. 61.3%), with some attenuation in risk after adjustment for sociodemographic factors (aRR 1.15, 95% CI 0.99, 1.33 and aRR 1.07, 95% 0.98, 1.16, respectively). Disparities were larger for women with moderate/severe disabilities and disabilities in ≥ 2 domains, with differences attenuated by adjustment for socio-demographics. Conclusions Women with disabilities, and particularly those with moderate/severe and multiple disabilities, could benefit from tailored, accessible breastfeeding supports that attend to the social determinants of health.
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- 2023
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16. Preventing postnatal depression in new mothers using telephone peer support: protocol for the DAISY (Depression and AnxIety peer Support studY) multi-centre randomised controlled trial
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Cindy-Lee Dennis, Emily Callander, Della A Forster, Helen L McLachlan, Touran Shafiei, Cattram D Nguyen, Tram Nguyen, Alan Shiell, Jan M Nicholson, Heather Grimes, Jessica Bee, and Catina Adams
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Medicine - Abstract
Introduction Postnatal depression affects up to one in six new mothers in Australia each year, with significant impacts on the woman and her family. Prevention strategies can be complicated by a woman’s reluctance to seek professional help. Peer support is a promising but inadequately tested early intervention. Very few trials have reported on the efficacy of peer support in the perinatal period and no study has been undertaken in Australia. We will explore if proactive telephone-based peer (mother-to-mother) support, provided to women identified as being at high risk of postnatal depression, impacts on clinically significant depressive symptomatology at 6 months postpartum.Methods and analysis This is a protocol for a single-blinded, multi-centre, randomised controlled trial conducted in Melbourne, Australia. Eligible women will be recruited from either the postnatal units of two maternity hospitals, or around 4 weeks postpartum at maternal and child health centres within two metropolitan council areas. A total of 1060 (530/group) women will be recruited and randomly allocated (1:1 ratio) to either—usual care, to receive the standard community postpartum services available to them, or the intervention group, to receive proactive telephone-based support from a peer volunteer for 6 months, in addition to standard community services. Primary outcome: clinically significant depressive symptomatology at 6 months postpartum as measured using the Edinburgh Postnatal Depression Scale. Secondary outcomes: symptoms of anxiety and/or stress, health-related quality of life, loneliness, perception of partner support, self-rated parenting, child health and development, infant feeding and health service use. The cost-effectiveness of the intervention relative to standard care will also be assessed.Ethics and dissemination Ethics approval has been obtained from La Trobe University, St. Vincent’s Hospital, the Royal Women’s Hospital, Northern Health, Victorian Department of Health and Human Services and Victorian Department of Education and Training. Written informed consent will be obtained from all participants before randomisation. Trial results will be disseminated through peer-reviewed publications, conference presentations and a higher degree thesis.Trial registration number ACTRN12619000684123; Australian New Zealand Clinical Trials Registry.
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- 2024
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17. Influence of paternal preconception health on pregnancy, intrapartum, postpartum and early childhood outcomes: protocol for a parallel scoping review
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Cindy-Lee Dennis, Nicole Letourneau, Jennifer Abbass-Dick, Shefaly Shorey, Justine Dol, Alistair Dennis-Grantham, Deepika Goyal, Daisy Singla, and Karen McQueen
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Medicine - Abstract
Introduction Preconception care is the provision of behavioural, social or biomedical interventions to women and couples prior to conception. To date, preconception research has primarily focused on maternal health, despite the male partner’s contribution before birth to both short-term and long-term child outcomes. The objectives of the reviews are: (1) to identify, consolidate and analyse the literature on paternal preconception health on pregnancy and intrapartum outcomes, and (2) to identify, consolidate and analyse the literature on paternal preconception health on postpartum and early childhood outcomes.Methods and analysis A scoping review will be conducted following the Joanna Briggs Institute methodology. MEDLINE, PsycINFO, Embase, Scopus and CINAHL databases will be searched for articles published in English. Two independent reviewers will screen titles and abstracts and then full text using Covidence, with conflicts resolved by a third reviewer. Data extraction will be performed using Covidence.Ethics and dissemination Ethics approval is not required for this scoping review. Results will be published in peer-reviewed journals as well as presented at relevant national and international conferences and meetings.
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- 2024
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18. HAWC+/SOFIA Polarimetry in L1688: Relative Orientation of Magnetic Field and Elongated Cloud Structure
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Lee, Dennis, Berthoud, Marc, Chen, Che-Yu, Cox, Erin G., Davidson, Jacqueline A., Encalada, Frankie J., Fissel, Laura M., Harrison, Rachel, Kwon, Woojin, Li, Di, Li, Zhi-Yun, Looney, Leslie W., Novak, Giles, Sadavoy, Sarah, Santos, Fabio P., Segura-Cox, Dominique, and Stephens, Ian
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Astrophysics - Solar and Stellar Astrophysics ,Astrophysics - Astrophysics of Galaxies - Abstract
We present a study of the relative orientation between the magnetic field and elongated cloud structures for the $\rho$ Oph A and $\rho$ Oph E regions in L1688 in the Ophiuchus molecular cloud. Combining inferred magnetic field orientation from HAWC+ 154 $\mu$m observations of polarized thermal emission with column density maps created using Herschel submillimeter observations, we find consistent perpendicular relative alignment at scales of $0.02$ pc ($33.6"$ at $d \approx 137$ pc) using the histogram of relative orientations (HRO) technique. This supports the conclusions of previous work using Planck polarimetry and extends the results to higher column densities. Combining this HAWC+ HRO analysis with a new Planck HRO analysis of L1688, the transition from parallel to perpendicular alignment in L1688 is observed to occur at a molecular hydrogen column density of approximately $10^{21.7}$ cm$^{-2}$. This value for the alignment transition column density agrees well with values found for nearby clouds via previous studies using only Planck observations. Using existing turbulent, magnetohydrodynamic simulations of molecular clouds formed by colliding flows as a model for L1688, we conclude that the molecular hydrogen volume density associated with this transition is approximately $\sim10^{4}$ cm$^{-3}$. We discuss the limitations of our analysis, including incomplete sampling of the dense regions in L1688 by HAWC+., Comment: To be published in ApJ
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- 2021
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19. Physician patient sharing relationships within insurance plan networks
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Graves, John A., Lee, Dennis, Leszinsky, Lena, Nshuti, Leonce, Nikpay, Sayeh, Richards, Michael, Buntin, Melinda B., and Polsky, Daniel
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Medical research -- Analysis ,Medicine, Experimental -- Analysis ,Cardiology -- Analysis ,Medicare -- Analysis ,Physician and patient -- Analysis ,Medicaid -- Analysis ,Managed care plans (Medical care) -- Analysis ,Physicians -- Analysis ,Medical care -- Quality management ,Business ,Health care industry - Abstract
Objective: To quantify shared patient relationships between primary care physicians (PCPs) and cardiologists and oncologists and the degree to which those relationships were captured within insurance networks. Data Sources: Secondary analysis of Vericred data on physician networks, CareSet data on physicians' shared Medicare patients, and insurance plan attributes from Health Insurance Compare. Data validation exercises used data from Physician Compare and IQVIA. Study Design: Cross-sectional study of the PCP-to-specialist in-network shared patient percentage (primary outcome). We also categorized networks by insurance market segment (Medicare Advantage [MA], Medicaid managed care, small-group or individually purchased), insurance plan type, and network breadth. Data Extraction: We analyzed data on 219,982 PCPs, 29,400 cardiologists, and 22,745 oncologists who, in 2021, accepted MA (n = 941 networks), Medicaid managed care (n = 293), and individually-purchased (n = 332) and small-group (n = 501) plans. Principal Findings: Networks captured, on average, 64.6% of PCP-cardiology shared patient ties, and 61.8% of PCP-oncologist ties. Less than half of in-network ties (44.5% and 38.9%, respectively) were among physicians with a common organizational affiliation. After adjustment for network breadth, we found no evidence of differences in the shared patient percentage across insurance market segments or networks of different types (p-value >0.05 for all comparisons). An exception was among national versus local and regional networks, where we found that national plans captured fewer shared patient ties, particularly among the narrowest networks (58.4% for national networksvs. 64.7% for local and regional networks for PCP-cardiology). Conclusions: Given recent trends toward narrower networks, our findings underscore the importance of incorporating additional and nuanced measures of network composition to aid plan selection (for patients) and to guide regulatory oversight. KEY WORDS health policy, insurance, insurance benefits, managed care programs, provider networks What is known on this topic * Enrollment in private insurance plans is expected to grow, and private plans are increasingly limiting the number of in-network providers and/or limiting coverage of out-of-network care. * Interspecialty communication among physicians is an important determinant of care quality, spending, and the experience of care for both physicians and patients. * Health services research on provider networks focuses almost exclusively on the breadth of networks, but not on their composition or quality. What this study adds * We develop a novel measure of the degree to which insurance plan networks capture interspecialty relationships among primary care physicians and specialists in oncology and cardiology. * We investigate variation in this measure across insurance market segments, plan types, and network breadth sizes. * In 2021, private insurance networks captured approximately two-thirds of patient-sharing relationships. We find substantial variation in the degree to which narrow network plans capture these relationships., 1 | INTRODUCTION The majority of insured people in the US are covered by private health plans. With few exceptions, these plans require receipt of care from in-network clinicians to [...]
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- 2023
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20. Protocol for an economic evaluation of scalable strategies to improve mental health among perinatal women: non-specialist care delivered via telemedicine vs. specialist care delivered in-person
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Daisy R. Singla, Claire de Oliveira, Sean M. Murphy, Vikram Patel, Jaime Charlebois, Wendy N. Davis, Cindy-Lee Dennis, J. Jo Kim, Paul Kurdyak, Andrea Lawson, Samantha Meltzer-Brody, Benoit H. Mulsant, Nour Schoueri-Mychasiw, Richard K. Silver, Dana Tschritter, Simone N. Vigod, and Sarah Byford
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Economic evaluation ,Protocol ,Perinatal mental health ,Randomized controlled trial ,Psychiatry ,RC435-571 - Abstract
Abstract Background Perinatal depression affects an estimated 1 in 5 women in North America during the perinatal period, with annualized lifetime costs estimated at $20.6 billion CAD in Canada and over $45.9 billion USD in the US. Access to psychological treatments remains limited for most perinatal women suffering from depression and anxiety. Some barriers to effective care can be addressed through task-sharing to non-specialist providers and through telemedicine platforms. The cost-effectiveness of these strategies compared to traditional specialist and in-person models remains unknown. This protocol describes an economic evaluation of non-specialist providers and telemedicine, in comparison to specialist providers and in-person sessions within the ongoing Scaling Up Maternal Mental healthcare by Increasing access to Treatment (SUMMIT) trial. Methods The economic evaluation will be undertaken alongside the SUMMIT trial. SUMMIT is a pragmatic, randomized, non-inferiority trial across five North American study sites (N = 1,226) of the comparable effectiveness of two types of providers (specialist vs. non-specialist) and delivery modes (telemedicine vs. in-person) of a behavioural activation treatment for perinatal depressive and anxiety symptoms. The primary economic evaluation will be a cost-utility analysis. The outcome will be the incremental cost-effectiveness ratio, which will be expressed as the additional cost required to achieve an additional quality-adjusted life-year, as assessed by the EuroQol 5-Dimension 5-Level instrument. A secondary cost-effectiveness analysis will use participants’ depressive symptom scores. A micro-costing analysis will be conducted to estimate the resources/costs required to implement and sustain the interventions; healthcare resource utilization will be captured via self-report. Data will be pooled and analysed using uniform price and utility weights to determine cost-utility across all trial sites. Secondary country-specific cost-utility and cost-effectiveness analyses will also be completed. Sensitivity analyses will be conducted, and cost-effectiveness acceptability-curves will be generated, in all instances. Discussion Results of this study are expected to inform key decisions related to dissemination and scale up of evidence-based psychological interventions in Canada, the US, and possibly worldwide. There is potential impact on real-world practice by informing decision makers of the long-term savings to the larger healthcare setting in services to support perinatal women with common mental health conditions.
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- 2023
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21. Joint Attention for Multi-Agent Coordination and Social Learning
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Lee, Dennis, Jaques, Natasha, Kew, Chase, Wu, Jiaxing, Eck, Douglas, Schuurmans, Dale, and Faust, Aleksandra
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Computer Science - Artificial Intelligence ,Computer Science - Multiagent Systems - Abstract
Joint attention - the ability to purposefully coordinate attention with another agent, and mutually attend to the same thing -- is a critical component of human social cognition. In this paper, we ask whether joint attention can be useful as a mechanism for improving multi-agent coordination and social learning. We first develop deep reinforcement learning (RL) agents with a recurrent visual attention architecture. We then train agents to minimize the difference between the attention weights that they apply to the environment at each timestep, and the attention of other agents. Our results show that this joint attention incentive improves agents' ability to solve difficult coordination tasks, by reducing the exponential cost of exploring the joint multi-agent action space. Joint attention leads to higher performance than a competitive centralized critic baseline across multiple environments. Further, we show that joint attention enhances agents' ability to learn from experts present in their environment, even when completing hard exploration tasks that do not require coordination. Taken together, these findings suggest that joint attention may be a useful inductive bias for multi-agent learning.
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- 2021
22. Household food insecurity is prevalent in a cohort of postpartum women who registered in the Canada Prenatal Nutrition Program in Toronto
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Alison Mildon, Jane Francis, Stacia Stewart, Bronwyn Underhill, Yi Man Ng, Christina Rousseau, Valerie Tarasuk, Erica Di Ruggiero, Cindy-Lee Dennis, Deborah L O’Connor, and Daniel W Sellen
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Household food insecurity ,Canada Prenatal Nutrition Program ,Vulnerable women ,Breastfeeding ,Public aspects of medicine ,RA1-1270 ,Nutritional diseases. Deficiency diseases ,RC620-627 - Abstract
Abstract Objective: To assess the prevalence, severity and socio-demographic predictors of household food insecurity among vulnerable women accessing the Canada Prenatal Nutrition Program (CPNP) and to examine associations between household food insecurity and breastfeeding practices to 6 months. Design: Cohort investigation pooling data from two studies which administered the 18-item Household Food Security Survey Module at 6 months postpartum and collected prospective infant feeding data at 2 weeks and 2, 4 and 6 months. Household food insecurity was classified as none, marginal, moderate or severe. Logistic regression analyses were performed to assess predictors of household food insecurity and associations between household food security (any and severity) and continued and exclusive breastfeeding. Setting: Three Toronto sites of the CPNP, a federal initiative targeting socially and/or economically vulnerable women. Participants: 316 birth mothers registered prenatally in the CPNP from 2017 to 2020. Results: Household food insecurity at 6 months postpartum was highly prevalent (44 %), including 11 % in the severe category. Risk of household food insecurity varied by CPNP site (P < 0·001) and was higher among multiparous participants (OR 2·08; 95 % CI 1·28, 3·39). There was no association between the prevalence or severity of food insecurity and continued or exclusive breastfeeding to 6 months postpartum in the adjusted analyses. Conclusions: Household food insecurity affected nearly half of this cohort of women accessing the CPNP. Further research is needed on household food insecurity across the national CPNP and other similar programmes, with consideration of the implications for programme design, service delivery and policy responses.
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- 2023
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23. Teaching by texting to promote positive health behaviours in pregnancy: a protocol for a randomised controlled trial of SmartMom
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Suzanne Tough, Wei Zhang, Wendy V Norman, Regina Renner, Nazeem Muhajarine, Jennifer Murray, Saraswathi Vedam, Patricia Janssen, Sara Lecke, Hamideh Bayrampour, and Cindy Lee Dennis
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Medicine - Abstract
Introduction Prenatal education is associated with positive health behaviours, including optimal weight gain, attendance at prenatal care, acceptance of routine screening tests, smoking cessation, decreased alcohol consumption and breast feeding. Adoption of these behaviours has been associated with reduced rates of caesarean birth, preterm birth and low birth weight. Barriers to prenatal class attendance faced by parents in Canada include geography, socioeconomic status, age, education, and, among Indigenous peoples and other equity-deserving groups, stigma. To address the need for easily accessible and reliable information, we created ‘SmartMom’, Canada’s first prenatal education programme delivered by short message service text messaging. SmartMom provides evidence-based information timed to be relevant to each week of pregnancy. The overall goal of SmartMom is to motivate the adoption of positive prenatal health behaviours with the ultimate goal of improving health outcomes among women and their newborns.Methods and analysis We will conduct a two-arm single-blinded randomised controlled trial. Blinding of participants to trial intervention will not be possible as they will be aware of receiving the intervention, but data analysts will be blinded. Our primary research questions are to determine if women experiencing uncomplicated pregnancies randomly assigned to receive SmartMom messages versus messages addressing general topics related to pregnancy but without direction for behaviour change, have higher rates of: (1) weight gain within ranges recommended for prepregnancy body mass index and (2) adherence to Canadian guidelines regarding attendance at prenatal care appointments.Ethics and dissemination The study has been granted a Certificate of Approval, number H22-00603, by the University of British Columbia Research Ethics Board. To disseminate our findings, we are undertaking both integrated and end-of-grant knowledge translation, which will proactively involve potential end-users and stakeholders at every phase of our project.Trial registration number NCT05793944.
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- 2024
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24. Mathematical Reasoning via Self-supervised Skip-tree Training
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Rabe, Markus N., Lee, Dennis, Bansal, Kshitij, and Szegedy, Christian
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Computer Science - Machine Learning ,Computer Science - Artificial Intelligence ,Computer Science - Programming Languages ,Statistics - Machine Learning - Abstract
We examine whether self-supervised language modeling applied to mathematical formulas enables logical reasoning. We suggest several logical reasoning tasks that can be used to evaluate language models trained on formal mathematical statements, such as type inference, suggesting missing assumptions and completing equalities. To train language models for formal mathematics, we propose a novel skip-tree task. We find that models trained on the skip-tree task show surprisingly strong mathematical reasoning abilities, and outperform models trained on standard skip-sequence tasks. We also analyze the models' ability to formulate new conjectures by measuring how often the predictions are provable and useful in other proofs.
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- 2020
25. Model-based Reinforcement Learning for Decentralized Multiagent Rendezvous
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Wang, Rose E., Kew, J. Chase, Lee, Dennis, Lee, Tsang-Wei Edward, Zhang, Tingnan, Ichter, Brian, Tan, Jie, and Faust, Aleksandra
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Computer Science - Multiagent Systems ,Computer Science - Artificial Intelligence ,Computer Science - Machine Learning ,Computer Science - Robotics - Abstract
Collaboration requires agents to align their goals on the fly. Underlying the human ability to align goals with other agents is their ability to predict the intentions of others and actively update their own plans. We propose hierarchical predictive planning (HPP), a model-based reinforcement learning method for decentralized multiagent rendezvous. Starting with pretrained, single-agent point to point navigation policies and using noisy, high-dimensional sensor inputs like lidar, we first learn via self-supervision motion predictions of all agents on the team. Next, HPP uses the prediction models to propose and evaluate navigation subgoals for completing the rendezvous task without explicit communication among agents. We evaluate HPP in a suite of unseen environments, with increasing complexity and numbers of obstacles. We show that HPP outperforms alternative reinforcement learning, path planning, and heuristic-based baselines on challenging, unseen environments. Experiments in the real world demonstrate successful transfer of the prediction models from sim to real world without any additional fine-tuning. Altogether, HPP removes the need for a centralized operator in multiagent systems by combining model-based RL and inference methods, enabling agents to dynamically align plans., Comment: CoRL 2020. The video is available at: https://youtu.be/-ydXHUtPzWE
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- 2020
26. A Grounded Theory Model of the Dynamics of Undergraduate Engineering Students' Researcher Identity and Epistemic Thinking
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Faber, Courtney J., Kajfez, Rachel L., Lee, Dennis M., Benson, Lisa C., Kennedy, Marian S., and Creamer, Elizabeth G.
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Undergraduate research experiences (UREs) in science and engineering offer a number of positive outcomes to the students who are able to participate, including increased retention, clarified career goals, and development of problem-solving skills. There have been a number of calls for research that investigates the experiences, identity, and cognitive develop of students who participate in UREs. In addition, recent work in other areas suggests that undergraduate students' perceptions often differ from those of faculty, graduate students, and staff, suggesting the need for research that considers the students' perspectives within these experiences. As such, in this constructivist grounded theory study, we sought to develop a contextualized model relating researcher identity and epistemic thinking for undergraduate engineering students engaged in research experiences. Data were collected from interviews with 20 undergraduate engineering students with research experience at six institutions. Coded interview transcripts were used to create structured memos that included a participant description, summary of salient concepts from theoretical frameworks and/or themes, and connections to other participants. These structured memos served as the data set used to develop the grounded theory model. This work establishes that (1) students' initial dispositions and beliefs about research influence their perceptions of researchers and themselves as researchers (researcher identity), (2) researcher identity can dissolve or solidify through UREs, (3) researcher identity affects and is affected by students' reflection on research practices, and (4) social interactions and context shape knowledge of research and researchers, researcher identity, and interest in research. Our work expands existing identity and epistemic thinking theories by investigating how students establish a researcher identity, conducting a context specific study of epistemic thinking, and exploring the relationships between these two constructs.
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- 2022
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27. Parent involvement in child anthropometric measurement
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Sarah Rae, Frank Ong, Cindy-Lee Dennis, Jill Hamilton, Eleanor Pullenayegum, Jonathon Maguire, and Catherine Birken
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Child Health ,Early childhood obesity ,Primary care ,Clinical Research ,Anthropometric measurement ,Parent participation ,Medicine (General) ,R5-920 - Abstract
Abstract Background Young children are often accompanied by their parent/caregiver when attending primary healthcare visits, where clinical procedures such as anthropometric measurements are conducted. Parents are not typically involved in their child’s anthropometric measurement collection, and there are no recommendations for parental involvement during visits. The objective of this study was to describe parents’ experiences with being involved in their child’s anthropometric measurements. Methods A 10-question survey comprised of scaled and open-ended questions was self-administered to participants after child anthropometric measurement collection including length/height, weight, head, arm, and waist circumference. Survey data were analyzed using a general inductive approach and thematic analysis. Surveys were collected in participating TARGet Kids! primary care practice sites in Toronto, Canada. Survey respondents included 30 parents of children
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- 2023
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28. The Canadian Healthy Life Trajectories Initiative (HeLTI) Trial: a study protocol for monitoring fidelity of a preconception-lifestyle behaviour intervention
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Cindy-Lee Dennis, Flavia Marini, Alessandra Prioreschi, Justine Dol, Catherine Birken, and Rhonda C. Bell
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Intervention ,Fidelity ,Public health ,eHealth ,Preventative medicine ,Randomized controlled trial ,Medicine (General) ,R5-920 - Abstract
Abstract Background In evaluating technology-based behaviour change interventions, it is increasingly important to have a monitoring plan for intervention fidelity. It is important to maintain intervention fidelity to ensure that the theory-based intervention that is being tested is what causes the observed changes, particularly for eHealth behaviour change interventions. In this protocol, we outline the intervention fidelity and monitoring protocol for Healthy Life Trajectory Initiative (HeLTI) Canada, a randomized controlled trial evaluating the effect of a preconception-early childhood technology-based intervention delivered by public health nurses among pregnancy-planning women and their partners to optimize child growth and development. Methods The HeLTI Canada fidelity protocol is based on the National Institutes of Health Behaviour Change Consortium (NIH BCC) Treatment Fidelity Framework, outlining the following components of intervention fidelity: study design, provider training, intervention delivery, intervention receipt, and intervention enactment. The intervention fidelity components and associated monitoring strategies were developed to align with the HeLTI Canada approach. Strategies for intervention fidelity monitoring include a pre-post written evaluation of training, standardization of provider training, use and monitoring of activity logs, and intervention session checklists. Possible challenges to intervention fidelity include provider turnover due to the length of the trial and lack of ability to directly monitor participant behaviour change in real-life settings. Details about intervention fidelity monitoring are provided in detail. The study launched in January 2021 and is currently recruiting. Discussion Using the NIH BCC Treatment Fidelity Framework, HeLTI Canada has a robust framework for monitoring and reporting intervention fidelity to improve intervention validity, ability to assess intervention effectiveness, and transparency. Trial registration ISRCN ISRCTN13308752 . Registered on February 29, 2019.
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- 2023
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29. Participation in Biology Education Research Influences Students' Epistemic Development
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Lee, Dennis, Wright, Mallory, Faber, Courtney, Kennedy, Cazembe, and Dittrich-Reed, Dylan
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Knowledge construction is an essential scientific practice, and undergraduate research experiences (UREs) provide opportunities for students to engage with this scientific practice in an authentic context. While participating in UREs, students develop conceptualizations about how science gathers, evaluates, and constructs knowledge (science epistemology) that align with scientific practice. However, there have been few studies focusing on how students' science epistemologies develop during these experiences. Through the analysis of written reflections and three research papers and by leveraging methods informed by collaborative autoethnography, we construct a case study of one student, describing the development of her science epistemology and scientific agency during her time participating in a biology education URE. Through her reflections and self-analysis, the student describes her context-dependent science epistemology, and how she discovered a new role as a critic of scientific papers. These results have implications for the use of written reflections to facilitate epistemic development during UREs and the role of classroom culture in the development of scientific agency.
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- 2021
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30. What Do Learners Value in Online Education? An Emerging Market Perspective
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Toufaily, Elissar, Zalan, Tatiana, and Lee, Dennis
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The purpose of this paper is to explore the value of e-learning from a student's perspective and develops a dynamic model for evaluating e-learning perceived value in an emerging market context. A qualitative research design, via semi-structured interviews, was adopted with a group of respondents composed of undergraduate and postgraduate students who were enrolled in online, hybrid and face-to-face programs. Coding, categorization and thematic analysis of the interviews resulted in seven value dimensions, with their "Get" and "Give" components, of the dynamic learning experience. The study highlights the importance of each value dimension in relation to the stage of the learner experience, namely, prior to, during and after the delivery. Our research extends current e-learning perceived value research and frameworks. The paper provides guidelines for higher education institutions and policy makers on institutional change to support e-learning initiatives.
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- 2018
31. Cross-cultural adaptation of the Breastfeeding Self-Efficacy Scale Short Form (BSES-SF) modified for preterm mothers in Brazil
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Clarice Borges Lucas Denobi, Lorena Maria Fernandes da Silva, Gabriela Ramos Ferreira Curan, Cindy-Lee Dennis, Mônica Oliveira Batista Oriá, and Edilaine Giovanini Rossetto
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Breastfeeding ,Self-efficacy ,Validation Study ,Premature Newborn ,Methodological Research in Nursing. ,Nursing ,RT1-120 - Abstract
ABSTRACT Objectives: to conduct a cross-cultural adaptation of the Breastfeeding Self-Efficacy Scale-Short Form (BSES-SF) for mothers of ill and/or preterm infants among Portuguese-speaking mothers in Brazil. Methods: a methodological study was completed, including the translation of the tool, synthesis of translations, review by experts, synthesis, reassessment of experts, back-translation, pre-test, and validation of the content. The study involved 19 participants, including a translator and experts. In addition, 18 mothers from the target population were included in the pre-test. Results: the equivalences of the opinion obtained by the committee of experts were semantic (85%), idiom (89%), cultural (86%), and conceptual (94%). The content validation coefficient (CVC) on the scale was 0.93 for clarity and understanding; 0.89 for practical relevance; 0.92 for relevance; and the average overall CVC was 0.91. Conclusions: the scale was translated and adapted to the Brazilian Portuguese language, which maintained the equivalences and confirmed the content validity.
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- 2023
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32. Mathematical Reasoning in Latent Space
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Lee, Dennis, Szegedy, Christian, Rabe, Markus N., Loos, Sarah M., and Bansal, Kshitij
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Computer Science - Machine Learning ,Computer Science - Artificial Intelligence ,Statistics - Machine Learning - Abstract
We design and conduct a simple experiment to study whether neural networks can perform several steps of approximate reasoning in a fixed dimensional latent space. The set of rewrites (i.e. transformations) that can be successfully performed on a statement represents essential semantic features of the statement. We can compress this information by embedding the formula in a vector space, such that the vector associated with a statement can be used to predict whether a statement can be rewritten by other theorems. Predicting the embedding of a formula generated by some rewrite rule is naturally viewed as approximate reasoning in the latent space. In order to measure the effectiveness of this reasoning, we perform approximate deduction sequences in the latent space and use the resulting embedding to inform the semantic features of the corresponding formal statement (which is obtained by performing the corresponding rewrite sequence using real formulas). Our experiments show that graph neural networks can make non-trivial predictions about the rewrite-success of statements, even when they propagate predicted latent representations for several steps. Since our corpus of mathematical formulas includes a wide variety of mathematical disciplines, this experiment is a strong indicator for the feasibility of deduction in latent space in general.
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- 2019
33. Effect of surgical intervention for childhood OSA on blood pressure: A randomized controlled study
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Au, Chun Ting, Chan, Kate Ching-ching, Lee, Dennis Lip Yen, Leung, Natalie Moon Wah, Chow, Samuel Man Wai, Kwok, Ka Li, Wing, Yun Kwok, and Li, Albert M.
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- 2023
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34. Factors associated with positive user experience with primary healthcare providers in Mexico: a multilevel modelling approach using national cross-sectional data.
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Holt, Kelsey, Doubova, Svetlana V, Lee, Dennis, Perez-Cuevas, Ricardo, and Leslie, Hannah H
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Humans ,Retrospective Studies ,Cross-Sectional Studies ,Communication ,Middle Aged ,Health Personnel ,Patient Satisfaction ,Primary Health Care ,Mexico ,Female ,Male ,patient centered care ,primary care ,Clinical Sciences ,Public Health and Health Services ,Other Medical and Health Sciences - Abstract
ObjectiveThis study aimed to investigate factors associated with patient experience with primary care in a large public health system in Mexico and determine the amount of variability in experience attributable to facility-level and state-level factors.MethodsWe analysed cross-sectional 2016 national satisfaction survey data from the Mexican Social Security Institute (IMSS). Patient-level data were merged with facility-level data and information on poverty by state. We assessed general contextual effects and examined the relationship of patient, facility and state factors with four patient experience measures using random effects logistic regression.Results25 745 patients' responses from 319 facilities were analysed. The majority experienced good communication (78%), the opportunity to share health concerns (91%) and resolution of doubts (85%). 29% of visits were rated as excellent. Differences between facilities and states accounted for up to 12% and 6% of the variation in patient experience, respectively. Inclusion of facility-level contextual effects improved model predictions by 8%-12%; models with facility random effects and individual covariates correctly predicted 64%-71% of individual outcomes. In adjusted models, larger patient population was correlated with worse reported communication, less opportunity to share concerns and less resolution of doubts. Men reported more positive communication; older individuals reported more positive communication and experiences overall, but less opportunity to share concerns; and more educated individuals were less likely to report positive communication but more likely to report resolution of doubts and overall positive experiences. Preventive care visits were rated higher than curative visits for resolution of doubts, but lower for opportunity to share concerns, and specific conditions were associated with better or worse reported experiences in some cases.ConclusionQuality improvement efforts at IMSS facilities might bolster individual experiences with primary care, given that up to 12% of the variation in experience was attributable to facility-level differences. The relationship between individual characteristics and experience ratings reinforces the importance of patients' expectations of care and the potential for differential treatment by providers to impact experience.
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- 2020
35. Study protocol for the sheMATTERS study (iMproving cArdiovascular healTh in new moThERS): a randomized behavioral trial assessing the effect of a self-efficacy enhancing breastfeeding intervention on postpartum blood pressure and breastfeeding continuation in women with hypertensive disorders of pregnancy
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Natalie Dayan, Graeme Smith, Atanas Nedelchev, Haim Abenhaim, Richard Brown, Deborah Da Costa, Suhad Ali, Jesseca Perlman, Tuong-Vi Nguyen, Cindy-Lee Dennis, Wael Abdelmageed, and Sonia Semenic
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Breastfeeding ,Hypertensive disorders of pregnancy ,Maternal health ,Postpartum cardiovascular health ,Self-efficacy ,Gynecology and obstetrics ,RG1-991 - Abstract
Abstract Background Individuals with hypertensive disorders of pregnancy (HDP) have an elevated lifetime risk of chronic hypertension, metabolic syndrome, and premature cardiovascular disease. Because breastfeeding duration and exclusivity have been associated in observational studies with improved cardiovascular health, optimizing breastfeeding in those with HDP might be an unrealized cardio-prevention approach, in particular because individuals with HDP have more breastfeeding challenges. Breastfeeding supportive interventions targeting one’s breastfeeding self-efficacy have been shown to improve breastfeeding rates. Methods We designed an open-label, multi-center 1:1 randomized behavioral trial to test whether a previously validated self-efficacy enhancing breastfeeding intervention can improve breastfeeding duration and/or exclusivity, and lower postpartum blood pressure at 12 months. Randomization is computer-generated and stratified by site (four hospitals in Montreal, Quebec and one hospital in Kingston, Ontario; all in Canada). Included are breastfeeding participants with HDP (chronic/gestational hypertension or preeclampsia) who delivered a live singleton infant at > 34 weeks, speak English or French, and have no contraindications to breastfeeding. Informed and written consent is obtained at hospitalization for delivery or a re-admission with hypertension within 1 week of discharge. Participants assigned to the intervention group receive a breastfeeding self-efficacy-based intervention delivered by a trained lactation consultant in hospital, with continued reactive/proactive support by phone or text message for up to 6 months postpartum. Regardless of group assignment, participants are followed for self-reported outcomes, automated office blood pressure, and home blood pressure at several time points with end of follow-up at 12 months. Discussion This study will assess whether an intensive nurse-led behavioral intervention can improve breastfeeding rates and, in turn, postpartum blood pressure – an early marker for atherosclerotic cardiovascular disease. If effective, this form of enhanced breastfeeding support, along with closer BP and metabolic surveillance, can be implemented broadly in individuals lactating after HDP. Trial registration ClinicalTrials.gov, # NCT04580927 , registered on Oct 9, 2020.
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- 2023
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36. CHH acquisition of interest in ERN
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Lee, Dennis
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- 1990
37. Feedback and Discourse as a Critical Skill for the Development of Experimentation Competencies
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Batzli, Janet M., Harris, Michelle A., Lee, Dennis, Horn, Heidi A., Ergazaki, Marida, Series Editor, Kampourakis, Kostas, Series Editor, Grace, Marcus, Editorial Board Member, Knippels, Marie Christine, Editorial Board Member, Zabel, Jörg, Editorial Board Member, Korfiatis, Constantinos, Editorial Board Member, Jimenez Aleixandre, Maria Pilar, Editorial Board Member, Yarden, Anat, Editorial Board Member, Hammann, Marcus, Editorial Board Member, Harms, Ute, Editorial Board Member, Reiss, Michael, Editorial Board Member, Gericke, Niklas, Editorial Board Member, El-Hani, Charbel Nino, Editorial Board Member, Dawson, Vaille, Editorial Board Member, Nehm, Ross, Editorial Board Member, McComas, William, Editorial Board Member, Passmore, Cynthia, Editorial Board Member, Pelaez, Nancy J., editor, Gardner, Stephanie M., editor, and Anderson, Trevor R., editor
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- 2022
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38. The PPD-ACT app in Canada: feasibility and a latent class analysis of participants with postpartum depression recruited to a psychiatric genetics study using a mobile application
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Joanna Collaton, Cindy-Lee Dennis, Valerie H. Taylor, Sophie Grigoriadis, Tim F. Oberlander, Benicio N. Frey, Ryan Van Lieshout, Jerry Guintivano, Samantha Meltzer-Brody, James L. Kennedy, and Simone N. Vigod
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Post-partum depression ,Feasibility ,Mobile app ,Study recruitment ,Psychiatry ,RC435-571 - Abstract
Abstract Background Postpartum depression (PPD) and postpartum psychosis (PPP) are linked to negative consequences for women and families. Virtual applications present a solution to the challenge of recruiting large samples for genetic PPD/PPP research. This study aimed to evaluate the feasibility of a protocol for enrolling Canadian women with PPD and PPP to a large international psychiatric genetics study using a mobile application (PPD-ACT), and identify clinically distinct subtypes of PPD in the recruited sample. Methods From April 2017–June 2019, Canadian women provided phenotypic data through the PPD-ACT app. Requests for a genetic sample were made from those with a current or past PPD episode based on an Edinburgh Postnatal Depression Scale (EPDS) score > 12 with onset in pregnancy or 0–3 months postpartum, and from those self-reporting lifetime PPP. Latent class analysis (LCA) was used to identify clinically distinct PPD subgroups based on participant responses to the EPDS scale. Results We identified 797 PPD cases, 404 of whom submitted DNA. There were 109 PPP cases, with 66 submitting DNA. PPD cases (86.7% White, mean 4.7 +/− 7.0 years since their episode) came from across Canadian provinces/territories. LCA identified two PPD classes clinically distinct by symptom severity: [1] moderate-severity (mean EPDS = 18.5+/− 2.5; 8.6% with suicidality), and [2] severe (mean EPDS = 24.5+/− 2.1; 52.8% with suicidality). Conclusions A mobile application rapidly collected data from individuals with moderate and severe symptoms of PPD, an advantage for genetics where specificity is optimal, as well as from women with a history of PPP, supporting future work using this approach.
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- 2022
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39. Internet-based cognitive therapy for women with antenatal depressive symptoms during the COVID-19 pandemic: protocol for a multi-center randomized controlled trial across China
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Chen-Chi Duan, Jia-Le Yu, Jing Tao, Chen Zhang, Dan Zhang, Xiu Zeng, Wan-Ting Zeng, Hua-Lin Xu, Jian-Yin Qiu, Cindy-Lee Dennis, Li Jin, He-Feng Huang, and Yan-Ting Wu
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Antenatal depression ,Cognitive behavior therapy ,Internet ,Psychological distress ,Anxiety ,COVID-19 ,Medicine (General) ,R5-920 - Abstract
Abstract Background Depression and anxiety are common among pregnant women. Internet-delivered psychological therapies such as cognitive behavioral therapy (iCBT) have been developed to increase accessibility and address common help-seeking barriers, especially during pandemic period. The objective of this trial is to evaluate the short-term and long-term effects of iCBT on reducing depressive symptoms among pregnant women during the COVID-19 pandemic with the overall goal of preventing depression recurrence in the first 12 months postpartum. Methods A multi-site randomized controlled trial will be conducted where 300 pregnant women early in their third trimester will be screened for depression symptoms using the Edinburgh Postnatal Depression Scale (EPDS) during a routine obstetrical visit. Eligible and consenting women with a score greater than 9 will be randomly allocated (1:1) to either intervention group or control group. ICBT involving the completion of 7 weekly online modules will be delivered via a well-designed perinatal mental healthcare app. The primary objective is to evaluate the effect of iCBT on reducing depression symptoms among pregnant Chinese women starting from their third trimester. The secondary objectives are to examine the effect of iCBT on anxiety, sleep quality, social support, parenting stress, co-parenting relationship, and infant development. Discussion This multi-center randomized controlled trial has been planned in accordance with best practices in behavioral trial design. The internet-based intervention addressed the needs of pregnant women during a major pandemic where face-to-face therapy is not preferable. The trial has a relatively large sample size with sufficient power to evaluate the efficacy of iCBT intervention for the primary and secondary outcomes. One year follow-up evaluation in the study is designed to determine the longer-term effect of the intervention on both maternal and infant outcomes. Although a limitation is the assessment of depression and anxiety using self-report measures, these easily incorporated and maternal-preferred assessments allow for real-life scalability if the intervention is proven to be effective. Ethics and dissemination Ethics was approved by the institutional review board of International Peace Maternity and Child Health Hospital (GKLW2020-25). Dissemination of results will be published in peer-reviewed academic journals and presented at scientific conferences. Trial status The first patient was enrolled on 19 August 2020. To date, 203 participants have met eligibility requirements and been randomized to either the intervention group or control group. Data collection aims to be complete in September 2022. Date and version identifier: 2020715-version1.0. Trial registration ChiCTR2000033433. Registered 31 May 2020, http://www.chictr.org.cn/showproj.aspx?proj=54482 .
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- 2022
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40. A protocol for monitoring fidelity of a preconception-life course intervention in a middle-income setting: the Healthy Life Trajectories Initiative (HeLTI), South Africa
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Larske M. Soepnel, Catherine E. Draper, Khuthala Mabetha, Cindy-Lee Dennis, Alessandra Prioreschi, Stephen Lye, and Shane A. Norris
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Fidelity ,Protocol ,Behavioural intervention ,Low- and middle-income setting ,Medicine (General) ,R5-920 - Abstract
Abstract Introduction Despite the importance of intervention fidelity in interpreting the outcomes of complex public health interventions, there is a lack of both reporting fidelity trial protocols and uniformity. In evaluating complex, adaptable/pragmatic interventions in resource-strapped settings with systemic issues, unique challenges to intervention adherence and monitoring are introduced, increasing the importance of a fidelity protocol. We aim to describe the intervention fidelity and monitoring protocol for the Healthy Life Trajectories Initiative (HeLTI) South Africa, a complex four-phase intervention set in urban Soweto, starting preconceptionally and continuing through to pregnancy, infancy, and early childhood to improve the health of young women and reduce the intergenerational risk of obesity. Methods The HeLTI SA fidelity protocol was based on the NIH Behaviour Change Consortium (NIH BCC) Treatment Fidelity Framework, outlining the following components of intervention fidelity: study design, provider training, intervention delivery, intervention receipt, and intervention enactment. Context-specific fidelity challenges were identified. The intervention fidelity components and associated monitoring strategies were developed to align with HeLTI SA. Strategies for fidelity monitoring include, amongst others, qualitative process evaluation methods, reviewing observed and recorded intervention sessions, monitoring of activity logs, standardized training, and intervention session checklists. Possible challenges to fidelity and fidelity monitoring include high provider turnover, lack of qualification amongst providers, difficulty tracing participants for follow-up sessions, participant health literacy levels, and the need to prioritize participants’ non-health-related challenges. Solutions proposed include adapting intervention delivery methods, recruitment methods, and provider training methods. Discussion The NIH BCC Treatment Fidelity Framework provided a solid foundation for reporting intervention fidelity across settings to improve intervention validity, ability to assess intervention effectiveness, and transparency. However, context-specific challenges to fidelity (monitoring) were identified, and transparency around such challenges and possible solutions in low- and middle-income settings could help foster solutions to improve adherence, reporting, and monitoring of intervention fidelity in this setting. Trial registration Pan African Clinical Trials Registry PACTR201903750173871 . Registered on 27 March 2019
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- 2022
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41. Gender-based discrimination and son preference in Punjabi-Canadian families: a community-based participatory qualitative research study
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Cindy-Lee Dennis, Susitha Wanigaratne, Marcelo Urquia, Pamela Uppal, Alia Januwalla, Amanpreet Brar, Manvir Bhangu, and Amrita Kumar-Ratta
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Medicine - Abstract
Objectives To conduct a qualitative study, guided by the principles of community-based participatory research, with the following objectives: (1) to provide a conceptual framework describing the drivers of son preference; (2) to understand experiences of son preference among Punjabi-Canadians and (3) with this understanding, identify and co-design an appropriate educational tool.Design, setting, participants, methods Qualitative study consisting of four bilingual (Punjabi and English) focus group discussions with 11 mothers, 4 fathers and 17 grandmothers in Toronto and Brampton, Canada. Participants were queried about experiences and perspectives related to reproductive decision-making, gender equity and son preference, and for appropriate approaches to reducing inequities. Transcripts were simultaneously translated and written in English and thematic analysis was conducted. An infoposter was identified as a feasible educational tool and was co-designed by researchers and community partners.Results Participants identified patrilocality (ie, married sons reside with parents, married daughters with in-laws) and patrilineality (ie, sons inherit assets, daughters’ husband receives a dowry) as structural precursors to proximal drivers (ie, old-age security) of son preference. Mothers’ and grandmothers’ value to their families depended strongly on having a son but did not guarantee security. Pressures (ie, internalised discrimination, reproductive coercion) to conceive a son were common after the birth of at least one daughter in the absence of sons. Participants did not know anyone who had a sex selective abortion in Canada; however, traditional sex selection methods (eg, herbal medicines) were mentioned. Our co-designed infoposter entitled ‘Truths About Son Preference’ addressed three misconceptions identified in discussions.Conclusion This study may be useful to health and social care providers in providing structurally competent and culturally humble counselling and care, particularly after the birth of daughters in the absence of sons. Community engagement is necessary for future intervention development.
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- 2023
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42. Modular Architecture for StarCraft II with Deep Reinforcement Learning
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Lee, Dennis, Tang, Haoran, Zhang, Jeffrey O, Xu, Huazhe, Darrell, Trevor, and Abbeel, Pieter
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Computer Science - Artificial Intelligence - Abstract
We present a novel modular architecture for StarCraft II AI. The architecture splits responsibilities between multiple modules that each control one aspect of the game, such as build-order selection or tactics. A centralized scheduler reviews macros suggested by all modules and decides their order of execution. An updater keeps track of environment changes and instantiates macros into series of executable actions. Modules in this framework can be optimized independently or jointly via human design, planning, or reinforcement learning. We apply deep reinforcement learning techniques to training two out of six modules of a modular agent with self-play, achieving 94% or 87% win rates against the "Harder" (level 5) built-in Blizzard bot in Zerg vs. Zerg matches, with or without fog-of-war., Comment: Accepted to The 14th AAAI Conference on Artificial Intelligence and Interactive Digital Entertainment (AIIDE'18)
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- 2018
43. ProMP: Proximal Meta-Policy Search
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Rothfuss, Jonas, Lee, Dennis, Clavera, Ignasi, Asfour, Tamim, and Abbeel, Pieter
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Computer Science - Machine Learning ,Statistics - Machine Learning - Abstract
Credit assignment in Meta-reinforcement learning (Meta-RL) is still poorly understood. Existing methods either neglect credit assignment to pre-adaptation behavior or implement it naively. This leads to poor sample-efficiency during meta-training as well as ineffective task identification strategies. This paper provides a theoretical analysis of credit assignment in gradient-based Meta-RL. Building on the gained insights we develop a novel meta-learning algorithm that overcomes both the issue of poor credit assignment and previous difficulties in estimating meta-policy gradients. By controlling the statistical distance of both pre-adaptation and adapted policies during meta-policy search, the proposed algorithm endows efficient and stable meta-learning. Our approach leads to superior pre-adaptation policy behavior and consistently outperforms previous Meta-RL algorithms in sample-efficiency, wall-clock time, and asymptotic performance., Comment: The first three authors contributed equally. Published at ICLR 2019
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- 2018
44. Recirculating Intestinal IgA-Producing Cells Regulate Neuroinflammation via IL-10.
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Rojas, Olga L, Pröbstel, Anne-Katrin, Porfilio, Elisa A, Wang, Angela A, Charabati, Marc, Sun, Tian, Lee, Dennis SW, Galicia, Georgina, Ramaglia, Valeria, Ward, Lesley A, Leung, Leslie YT, Najafi, Ghazal, Khaleghi, Khashayar, Garcillán, Beatriz, Li, Angela, Besla, Rickvinder, Naouar, Ikbel, Cao, Eric Y, Chiaranunt, Pailin, Burrows, Kyle, Robinson, Hannah G, Allanach, Jessica R, Yam, Jennifer, Luck, Helen, Campbell, Daniel J, Allman, David, Brooks, David G, Tomura, Michio, Baumann, Ryan, Zamvil, Scott S, Bar-Or, Amit, Horwitz, Marc S, Winer, Daniel A, Mortha, Arthur, Mackay, Fabienne, Prat, Alexandre, Osborne, Lisa C, Robbins, Clinton, Baranzini, Sergio E, and Gommerman, Jennifer L
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Intestines ,Intestinal Mucosa ,Plasma Cells ,Animals ,Mice ,Inbred C57BL ,Humans ,Mice ,Multiple Sclerosis ,Encephalomyelitis ,Autoimmune ,Experimental ,Immunoglobulin A ,Interleukin-10 ,Neuroimmunomodulation ,B cells ,EAE ,IgA ,MS ,experimental autoimmune encephalomyelitis ,microbiota ,multiple sclerosis ,plasma cells ,small intestinal lamina propria ,Autoimmune Disease ,Brain Disorders ,Neurodegenerative ,Digestive Diseases ,Neurosciences ,Biological Sciences ,Medical and Health Sciences ,Developmental Biology - Abstract
Plasma cells (PC) are found in the CNS of multiple sclerosis (MS) patients, yet their source and role in MS remains unclear. We find that some PC in the CNS of mice with experimental autoimmune encephalomyelitis (EAE) originate in the gut and produce immunoglobulin A (IgA). Moreover, we show that IgA+ PC are dramatically reduced in the gut during EAE, and likewise, a reduction in IgA-bound fecal bacteria is seen in MS patients during disease relapse. Removal of plasmablast (PB) plus PC resulted in exacerbated EAE that was normalized by the introduction of gut-derived IgA+ PC. Furthermore, mice with an over-abundance of IgA+ PB and/or PC were specifically resistant to the effector stage of EAE, and expression of interleukin (IL)-10 by PB plus PC was necessary and sufficient to confer resistance. Our data show that IgA+ PB and/or PC mobilized from the gut play an unexpected role in suppressing neuroinflammation.
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- 2019
45. Antepartum sleep quality, mental status, and postpartum depressive symptoms: a mediation analysis
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Yu Wang, Han Liu, Chen Zhang, Cheng Li, Jing-Jing Xu, Chen-Chi Duan, Lei Chen, Zhi-Wei Liu, Li Jin, Xian-Hua Lin, Chen-Jie Zhang, Han-Qiu Zhang, Jia-Le Yu, Tao Li, Cindy-Lee Dennis, Hong Li, and Yan-Ting Wu
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Sleep quality ,Mental status ,Perinatal depressive symptoms ,Mediating effect ,Psychiatry ,RC435-571 - Abstract
Abstract Background Poor sleep quality and maternal mood disturbances are common during pregnancy and may play pivotal roles in the development of postpartum depression. We aim to examine the trajectories of sleep quality and mental health in women from early pregnancy to delivery and explore the mediating effects of sleep quality and mental status on the link between antepartum depressive symptoms and postpartum depressive symptoms. Methods In an ongoing prospective birth cohort, 1301 women completed questionnaires in the first, second and third trimesters and at 6 weeks postpartum. In each trimester, sleep quality was measured utilizing the Pittsburgh Sleep Quality Index (PSQI), and mental health was assessed with the Center for Epidemiologic Studies Depression Scale (CES-D), the Self-Rating Anxiety Scale (SAS) and the Perceived Stress Scale (PSS). Postpartum depressive symptoms were evaluated by the Edinburgh Postnatal Depression Scale (EPDS). The bootstrap method was used to test the mediation effect. Results The PSQI, CES-D, and SAS scores presented U-shaped curves across the antenatal period while the PSS score followed a descending trend. Antenatal sleep quality, depressive symptoms, anxiety symptoms and perceived stress all predicted depressive symptoms at 6 weeks postpartum. The influence of antepartum depressive symptoms on postpartum depressive symptoms was mediated by antepartum sleep quality and anxiety symptoms, which accounted for 32.14%, 39.25% and 31.25% in the first, second and third trimesters (P = 0.002, P = 0.001, P = 0.001, respectively). Conclusions Poor sleep quality and anxiety symptoms in pregnancy mediated the relationship between antepartum depressive symptoms and postpartum depressive symptoms. Interventions aimed at detecting and managing sleep quality and elevated anxiety among depressed women in pregnancy warrant further investigation as preventative strategies for postpartum depression.
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- 2022
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46. Cohort profile: Impact of Maternal and Paternal Mental Health – Assessing Concurrent Depression, Anxiety and Comorbidity in the Canadian Family (IMPACT study)
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Cindy-Lee Dennis, Simone Vigod, Rahman Shiri, Sarah Brennenstuhl, Kobra Falah-Hassani, Flavia Marini, Sophie Grigoriadis, Justine Dol, Hillary Brown, and Mark Wade
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Medicine - Abstract
Purpose This paper describes a prospective cohort, Impact of Maternal and Paternal Mental Health: Assessing Concurrent Depression, Anxiety and Comorbidity in The Canadian Family (IMPACT) study, which followed maternal–paternal dyads and their children across the first 2 years post partum.Participants A total of 3217 cohabitating maternal–paternal dyads were recruited into the study from 2014 to 2018. Each dyad member separately completed online questionnaires at baseline (
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- 2023
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47. From Basic to Humane Genomics Literacy: How Different Types of Genetics Curricula Could Influence Anti-Essentialist Understandings of Race
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Donovan, Brian M., Weindling, Monica, and Lee, Dennis M.
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Genetic essentialism of race is the belief that racial groups have different underlying genetic essences which cause them to differ physically, cognitively, or behaviorally. Apparently, no published studies have explored if belief in genetic essentialism of race among adolescents differs after many weeks of formal instruction about different domains of genetics knowledge. Nor have any studies explored if such differences reflect a coherent change in students' racial beliefs. We use a quasi-experimental design (N = 254 students in 7th-12th grade) to explore these gaps. Over the course of 3 months, we compared students who learned from a curriculum on multifactorial inheritance and genetic ancestry to students who learned from their business as usual (BAU) genetics curriculum that discussed Mendelian and molecular genetics without any reference to race, multifactorial genetics, or genetic ancestry. Relative to the BAU condition, classrooms that learned from the multifactorial genetics and ancestry curriculum grew significantly more in their knowledge of multifactorial genetics and decreased significantly more in their genetic essentialist perceptions, attributions, and beliefs. From a conceptual change perspective, these findings suggest that classrooms using a curriculum emphasizing genetic complexity are more likely to shift toward a coherent anti-essentialist understanding of racial difference.
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- 2020
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48. Clinical translation of long-acting drug delivery formulations
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Li, Wei, Tang, Jie, Lee, Dennis, Tice, Thomas R., Schwendeman, Steven P., and Prausnitz, Mark R.
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- 2022
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49. Solvent-free bottom-up patterning of zeolitic imidazolate frameworks
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Miao, Yurun, Lee, Dennis T., de Mello, Matheus Dorneles, Ahmad, Mueed, Abdel-Rahman, Mohammed K., Eckhert, Patrick M., Boscoboinik, J. Anibal, Fairbrother, D. Howard, and Tsapatsis, Michael
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- 2022
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50. The development of a patient decision aid to reduce decisional conflict about antidepressant use in pregnancy
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Neesha Hussain-Shamsy, Sarah Somerton, Donna E. Stewart, Sophie Grigoriadis, Kelly Metcalfe, Tim F. Oberlander, Carrie Schram, Valerie H. Taylor, Cindy-Lee Dennis, and Simone N. Vigod
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Patient decision aid ,Pregnancy ,Antidepressant ,Depression ,Online ,Computer applications to medicine. Medical informatics ,R858-859.7 - Abstract
Abstract Background People with moderate to severe depression in pregnancy must weigh potential risks of untreated or incompletely treated depression against the small, but uncertain risks of fetal antidepressant drug exposure. Clinical support alone appears insufficient for helping individuals with this complex decision. A patient decision aid (PDA) has the potential to be a useful tool for this population. The objective of our work was to use internationally recognized guidelines from the International Patient Decision Aids Standards Collaboration to develop an evidence-based PDA for antidepressant use in pregnancy. Methods A three-phased development process was used whereby, informed by patient and physician perspectives and evidence synthesis, a steering committee commissioned a web-based PDA for those deciding whether or not to start or continue antidepressant treatment for depression in pregnancy (Phase 1). A prototype was developed (Phase 2) and iteratively revised based on feedback during field testing based on a user-centred process (Phase 3). Results We developed a web-based PDA for people deciding whether to start or continue antidepressant use for depression in pregnancy. It has five interactive sections: (1) information on depression and treatment; (2) reasons to start/continue an antidepressant and to start/stop antidepressant medication; (3) user assessment of values regarding each issue; (4) opportunity to reflect on factors that contribute to decision making; and (5) a printable PDF that summarizes the user’s journey through the PDA. Conclusions This tool, which exclusively focuses on depression treatment with Selective Serotonin Reuptake Inhibitors and Serotonin–Norepinephrine Reuptake Inhibitors, can be used by individuals making decisions about antidepressant use to treat depression during pregnancy. Limitations of the PDA are that it is not for other conditions, nor other medications that can be used for depression, and in its pilot form cannot be used by women who do not speak English or who have a visual impairment. Pending further study, it has the potential to enhance quality of care and patient experience.
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- 2022
- Full Text
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