136 results on '"Kyung, M."'
Search Results
2. Synergistic combination of information from ground observations, geostationary satellite, and air quality modeling towards improved PM2.5 predictability
- Author
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Jinhyeok Yu, Chul H. Song, Dogyeong Lee, Sojin Lee, Hyun S. Kim, Kyung M. Han, Seohui Park, Jungho Im, Soon-Young Park, Moongu Jeon, Vincent-Henri Peuch, Pablo E. Saide, Gregory R. Carmichael, Jeeho Kim, Jhoon Kim, Chang-Keun Song, Jung-Hun Woo, and Seong-Hyun Ryu
- Subjects
Environmental sciences ,GE1-350 ,Meteorology. Climatology ,QC851-999 - Abstract
Abstract Concentrations of ambient particulate matter (such as PM2.5 and PM10) have come to represent a serious environmental problem worldwide, causing many deaths and economic losses. Because of the detrimental effects of PM2.5 on human health, many countries and international organizations have developed and operated regional and global short-term PM2.5 prediction systems. The short-term predictability of PM2.5 (and PM10) is determined by two main factors: the performance of the air quality model and the precision of the initial states. While specifically focusing on the latter factor, this study attempts to demonstrate how information from classical ground observation networks, a state-of-the-art geostationary (GEO) satellite sensor, and an advanced air quality modeling system can be synergistically combined to improve short-term PM2.5 predictability over South Korea. Such a synergistic combination of information can effectively overcome the major obstacle of scarcity of information, which frequently occurs in PM2.5 prediction systems using low Earth orbit (LEO) satellite-borne observations. This study first presents that the scarcity of information is mainly associated with cloud masking, sun-glint effect, and ill-location of satellite-borne data, and it then demonstrates that an advanced air quality modeling system equipped with synergistically-combined information can achieve substantially improved performances, producing enhancements of approximately 10%, 19%, 29%, and 10% in the predictability of PM2.5 over South Korea in terms of index of agreement (IOA), correlation coefficient (R), mean biases (MB), and hit rate (HR), respectively, compared to PM2.5 prediction systems using only LEO satellite-derived observations.
- Published
- 2023
- Full Text
- View/download PDF
3. Evaluation of biogenic emissions from three different vegetation distributions in South Korea
- Author
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Yu, Jinhyeok, Han, Kyung M., Song, Chul H., Lee, Kyunghwa, Lee, Sojin, Kim, Younha, Woo, Jung-Hun, Kim, Saewung, and Wisthaler, Armin
- Published
- 2023
- Full Text
- View/download PDF
4. Development of a CNN+LSTM Hybrid Neural Network for Daily PM2.5 Prediction
- Author
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Hyun S. Kim, Kyung M. Han, Jinhyeok Yu, Jeeho Kim, Kiyeon Kim, and Hyomin Kim
- Subjects
artificial neural network ,CNN+LSTM ,daily PM2.5 prediction ,Meteorology. Climatology ,QC851-999 - Abstract
A CNN+LSTM (Convolutional Neural Network + Long Short-Term Memory) based deep hybrid neural network was established for the citywide daily PM2.5 prediction in South Korea. The structural hyperparameters of the CNN+LSTM model were determined through comprehensive sensitivity tests. The input features were obtained from the ground observations and GFS forecast. The performance of CNN+LSTM was evaluated by comparison with PM2.5 observations and with the 3-D CTM (three-dimensional chemistry transport model)-predicted PM2.5. The newly developed hybrid model estimated more accurate ambient levels of PM2.5 compared to the 3-D CTM. For example, the error and bias of the CNN+LSTM prediction were 1.51 and 6.46 times smaller than those by 3D-CTM simulation. In addition, based on IOA (Index of Agreement), the accuracy of CNN+LSTM prediction was 1.10–1.18 times higher than the 3-D CTM-based prediction. The importance of input features was indirectly investigated by sequential perturbing input variables. The most important meteorological and atmospheric environmental features were geopotential height and previous day PM2.5. The obstacles of the current CNN+LSTM-based PM2.5 prediction were also discussed. The promising result of this study indicates that DNN-based models can be utilized as an effective tool for air quality prediction.
- Published
- 2022
- Full Text
- View/download PDF
5. Infection-control knowledge, attitude, practice, and risk perception of occupational exposure to Zika virus among nursing students in Korea: A cross-sectional survey
- Author
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Choi, Jeong Sil and Kim, Kyung M.
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- 2018
- Full Text
- View/download PDF
6. An investigation into atmospheric nitrous acid (HONO) processes in South Korea.
- Author
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Kiyeon Kim, Han, Kyung M., Song, Chul H., Hyojun Lee, Beardsley, Ross, Jinhyeok Yu, Yarwood, Greg, Bonyoung Koo, Madalipay, Jasper, Jung-Hun Woo, and Seogju Cho
- Abstract
Nitrous acid (HONO) is a main precursor of hydroxyl radicals (OH), which contribute to the formation of numerous secondary air pollutants in the troposphere. Despite its importance in atmospheric chemistry, HONO chemistry has not been fully incorporated into many chemical transport models (CTMs). Due to the lack of atmospheric HONO processes, CTM simulations often tend to underestimate atmospheric mixing ratios of HONO. This study was undertaken because simulations with current Community Multiscale Air Quality (CMAQ) model have a strong tendency to underestimate the HONO mixing ratio. In search of missing sources of atmospheric HONO, we attempted to sequentially incorporate the following potential HONO sources and processes into the CMAQ modeling framework: (i) gas-phase HONO reactions; (ii) traffic HONO emissions; (iii) soil HONO emissions; (iv) heterogeneous HONO production on the surfaces of aerosols; (v) heterogeneous HONO formation on tree leaf and building surfaces; (vi) photolysis reactions of particulates and deposited HNO3/nitrates called 'renoxification'. The simulation performances of the modified CMAQ models were then evaluated by comparing the modeled HONO mixing ratios with the HONO mixing ratios observed at the Olympic Park station in Seoul, South Korea. When HONO processes were fully added to the CMAQ model, average daily HONO mixing ratios increased from 0.06 ppb to 1.18 ppb. The daytime HONO mixing ratios produced from the CMAQ model run with a full account of atmospheric HONO processes were found to be in better agreement with observations than those from the original CMAQ model (CMAQv5.2.1) runs with improved statistical metrics (e.g., IOA increased from 0.59 to 0.68, while MB decreased dramatically from -0.57 ppb to -0.34 ppb). In addition, we investigated the contributions of individual atmospheric HONO processes to HONO mixing ratios, as well as the impacts of HONO atmospheric processes on the concentrations of other atmospheric species in South Korea. All these issues are also discussed in this manuscript. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
7. Infection-control knowledge, attitude, practice, and risk perception of occupational exposure to Zika virus among nursing students in Korea: A cross-sectional survey
- Author
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Jeong Sil Choi and Kyung M. Kim
- Subjects
Infectious and parasitic diseases ,RC109-216 ,Public aspects of medicine ,RA1-1270 - Abstract
Background: As the number of patients with Zika virus infection increases worldwide, nursing students who conduct clinical practice in hospitals tend to at risk of Zika virus infection. Therefore, this study was conducted to identify nursing students’ knowledge, attitudes, practices, and risk perceptions of infection prevention related to occupational exposure to Zika virus infection, and to identify correlations among the related variables. Methods: This cross-sectional study included 249 nursing students from 3 nursing colleges located in 3 Korean cities, with experience in hospital clinical practice. A questionnaire to assess the knowledge, attitudes, practices, and risk perceptions of Zika virus infection was developed through a literature review and was subjected to pilot testing and validation. Results: The level of infection-control knowledge for Zika virus was 54.5 of 100 points, and that of practice was 4.5 of 5 points. The infection-prevention attitude score was 4.4 of 5 points, and the risk-perception score was 2.3 of 5 points. Significant differences emerged in infection-prevention attitude toward Zika virus based on Zika virus vaccination intention. Additionally, practice and risk-perception scores differed significantly based on gender and Zika virus vaccination intention. Knowledge significantly correlated with attitude and attitude toward preventive behavior. Conclusion: Improvement in infection-control knowledge for Zika virus can help improve nurses’ related attitudes, which in turn could promote effective practice. Considering the characteristics of nursing students, it is necessary to develop and apply an effective and viable education program related to the prevention of Zika virus infection. Keywords: Zika, Nursing student, Knowledge, Attitude, Practice
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- 2018
- Full Text
- View/download PDF
8. Crop Residue Burning Emissions and the Impact on Ambient Particulate Matters over South Korea
- Author
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Kyung M. Han, Byung T. Lee, Min-Suk Bae, Sojin Lee, Chang H. Jung, and Hyun S. Kim
- Subjects
crop residue burning (CRB) ,emissions ,PM2.5 ,PM10 ,WRF-CMAQ simulation ,field survey ,Meteorology. Climatology ,QC851-999 - Abstract
In the study, crop residue burning (CRB) emissions were estimated based on field surveys and combustion experiments to assess the impact of the CRB on particulate matter over South Korea. The estimates of CRB emissions over South Korea are 9514, 8089, 4002, 2010, 172,407, 7675, 33, and 5053 Mg year−1 for PM10, PM2.5, OC, EC, CO, NOx, SO2, and NH3, respectively. Compared with another study, our estimates in the magnitudes of CRB emissions were not significantly different. When the CRB emissions are additionally considered in the simulation, the monthly mean differences in PM2.5 (i.e., △PM2.5) were marginal between 0.07 and 0.55 μg m−3 over South Korea. Those corresponded to 0.6–4.3% in relative differences. Additionally, the △PM10 was 0.07–0.60 μg m−3 over South Korea. In the spatial and temporal aspects, the increases in PM10 and PM2.5 were high in Gyeongbuk (GB) and Gyeongnam (GN) provinces in June, October, November, and December.
- Published
- 2022
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9. Initiation and Use of Propranolol for Infantile Hemangioma: Report of a Consensus Conference
- Author
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Drolet, Beth A, Frommelt, Peter C, Chamlin, Sarah L, Haggstrom, Anita, Bauman, Nancy M, Chiu, Yvonne E, Chun, Robert H, Garzon, Maria C, Holland, Kristen E, Liberman, Leonardo, MacLellan-Tobert, Susan, Mancini, Anthony J, Metry, Denise, Puttgen, Katherine B, Seefeldt, Marcia, Sidbury, Robert, Ward, Kendra M, Blei, Francine, Baselga, Eulalia, Cassidy, Laura, Darrow, David H, Joachim, Shawna, Kwon, Eun-Kyung M, Martin, Kari, Perkins, Jonathan, Siegel, Dawn H, Boucek, Robert J, and Frieden, Ilona J
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Pediatric ,Congenital Structural Anomalies ,Clinical Research ,Cardiovascular ,Consensus Development Conferences as Topic ,Hemangioma ,Humans ,Infant ,Propranolol ,Research Report ,Vascular Neoplasms ,infantile hemangioma ,propranolol ,PHACE syndrome ,hypertension ,bradycardia ,hypoglycemia ,Medical and Health Sciences ,Psychology and Cognitive Sciences ,Pediatrics - Abstract
Infantile hemangiomas (IHs) are common neoplasms composed of proliferating endothelial-like cells. Despite the relative frequency of IH and the potential severity of complications, there are currently no uniform guidelines for treatment. Although propranolol has rapidly been adopted, there is significant uncertainty and divergence of opinion regarding safety monitoring, dose escalation, and its use in PHACE syndrome (PHACE = posterior fossa, hemangioma, arterial lesions, cardiac abnormalities, eye abnormalities; a cutaneous neurovascular syndrome characterized by large, segmental hemangiomas of the head and neck along with congenital anomalies of the brain, heart, eyes and/or chest wall). A consensus conference was held on December 9, 2011. The multidisciplinary team reviewed existing data on the pharmacologic properties of propranolol and all published reports pertaining to the use of propranolol in pediatric patients. Workgroups were assigned specific topics to propose protocols on the following subjects: contraindications, special populations, pretreatment evaluation, dose escalation, and monitoring. Consensus protocols were recorded during the meeting and refined after the meeting. When appropriate, protocol clarifications and revision were made and agreed upon by the group via teleconference. Because of the absence of high-quality clinical research data, evidence-based recommendations are not possible at present. However, the team agreed on a number of recommendations that arose from a review of existing evidence, including when to treat complicated IH; contraindications and pretreatment evaluation protocols; propranolol use in PHACE syndrome; formulation, target dose, and frequency of propranolol; initiation of propranolol in infants; cardiovascular monitoring; ongoing monitoring; and prevention of hypoglycemia. Where there was considerable controversy, the more conservative approach was selected. We acknowledge that the recommendations are conservative in nature and anticipate that they will be revised as more data are made available.
- Published
- 2013
10. Propranolol Treatment of Infantile Hemangiomas: Anticipatory Guidance for Parents and Caretakers
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Martin, Kari, Bleib, Francine, Chamlin, Sarah L, Chiu, Yvonne E, Frieden, Ilona J, Frommelt, Peter C, Garzon, Maria C, Kwon, Eun‐Kyung M, MacLellan‐Tobert, Susan, Mancini, Anthony J, Seefeldt, Marcia, Sidbury, Robert, Siegel, Dawn H, Drolet, Beth A, and Boucek, Robert J
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Pediatric ,Cancer ,Pediatric Research Initiative ,Caregivers ,Dose-Response Relationship ,Drug ,Drug Administration Schedule ,Female ,Follow-Up Studies ,Guidelines as Topic ,Hemangioma ,Capillary ,Humans ,Infant ,Infant ,Newborn ,Male ,Neoplastic Syndromes ,Hereditary ,Parents ,Propranolol ,Risk Assessment ,Skin Neoplasms ,Treatment Outcome ,Paediatrics and Reproductive Medicine ,Dermatology & Venereal Diseases - Abstract
Infantile hemangiomas (IH) are benign tumors of endothelial-like cells. Occurring in 4.5% of children, they are the most common tumor of childhood. The great majority of patients with IH will not need treatment, but 10% require systemic treatment. Many treatments have been described for the treatment of IH, but the Food and Drug Administration has not approved any. Over the last decade, numerous reports of successful treatment of IH with propranolol have been published. Despite its widespread use, little is known regarding the proper dosing, safety monitoring, and during of treatment or long-term outcomes for propranolol treatment of IH. Given its potential side effects, detailed education regarding proper administration of the medication as well as warning signs to watch for is necessary for parents and caretakers. Herein, we provide a parental handout that practitioners can individually tailor for use in their clinics when educating parents and caretakers about the use of propranolol for IH. Updates will also need to be made as more is learned regarding the optimal dosing and safety monitoring when using propranolol for this indication.
- Published
- 2013
11. Data Assimilation of AOD and Estimation of Surface Particulate Matters over the Arctic
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Kyung M. Han, Chang H. Jung, Rae-Seol Park, Soon-Young Park, Sojin Lee, Markku Kulmala, Tuukka Petäjä, Grzegorz Karasiński, Piotr Sobolewski, Young Jun Yoon, Bang Young Lee, Kiyeon Kim, and Hyun S. Kim
- Subjects
CMAQ model ,MODIS ,AERONET ,aerosol optical depth (τ) ,optimal interpolation ,Arctic ,Technology ,Engineering (General). Civil engineering (General) ,TA1-2040 ,Biology (General) ,QH301-705.5 ,Physics ,QC1-999 ,Chemistry ,QD1-999 - Abstract
In this study, more accurate information on the levels of aerosol optical depth (AOD) was calculated from the assimilation of the modeled AOD based on the optimal interpolation method. Additionally, more realistic levels of surface particulate matters over the Arctic were estimated using the assimilated AOD based on the linear relationship between the particulate matters and AODs. In comparison to the MODIS observation, the assimilated AOD was much improved compared with the modeled AOD (e.g., increase in correlation coefficients from −0.15–0.26 to 0.17–0.76 over the Arctic). The newly inferred monthly averages of PM10 and PM2.5 for April–September 2008 were 2.18–3.70 μg m−3 and 0.85–1.68 μg m−3 over the Arctic, respectively. These corresponded to an increase of 140–180%, compared with the modeled PMs. In comparison to in-situ observation, the inferred PMs showed better performances than those from the simulations, particularly at Hyytiala station. Therefore, combining the model simulation and data assimilation provided more accurate concentrations of AOD, PM10, and PM2.5 than those only calculated from the model simulations.
- Published
- 2021
- Full Text
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12. Effect of Ion Concentration on the Electro-Optic Response in Polymer-Stabilized Cholesteric Liquid Crystals
- Author
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Kyung M. Lee, Timothy J. Bunning, Timothy J. White, Michael E. McConney, and Nicholas P. Godman
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liquid crystals ,cholesteric liquid crystals ,initiator-less polymerization ,optical materials ,Crystallography ,QD901-999 - Abstract
We have previously reported that the application of a DC field can adjust the position and/or bandwidth of the selective reflection notch in polymer-stabilized cholesteric liquid crystals (PSCLCs). The proposed mechanism of these electro-optic (EO) response is ion-facilitated electromechanical deformation of the polymer stabilizing network. Accordingly, the concentration of ions trapped within the polymer network should considerably influence the EO response of PSCLC. Our prior studies have indicated that photoinitiators can increase ion density in PSCLC by an order of magnitude. Here, we isolate the contribution of ionic impurities associated with liquid crystal monomers (LCMs) by utilizing initiator-less polymerization. PSCLCs prepared with LCM with low ion concentration show bandwidth broadening of the reflection band whereas PSCLCs prepared with LCM with high ion concentration exhibit a red shifting tuning of the reflection band. The extent of the tuning or bandwidth broadening of the CLC reflection band depends on the concentration of LCMs and the chirality of the LCM.
- Published
- 2020
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13. Development of a CNN+LSTM Hybrid Neural Network for Daily PM2.5 Prediction
- Author
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Kim, Hyun S., primary, Han, Kyung M., additional, Yu, Jinhyeok, additional, Kim, Jeeho, additional, Kim, Kiyeon, additional, and Kim, Hyomin, additional
- Published
- 2022
- Full Text
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14. Evaluating Prostate-Specific Antigen Screening for Young African American Men With Cancer
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Edmund M Qiao, Julie A Lynch, Kyung M Lee, Nikhil V Kotha, Vinit Nalawade, Rohith S Voora, Alexander S Qian, Tyler J Nelson, Kosj Yamoah, Isla P Garraway, Tyler F Stewart, J Kellogg Parsons, and Brent S Rose
- Subjects
Adult ,Black or African American ,Male ,Cancer Research ,Oncology ,Risk Factors ,Humans ,Prostatic Neoplasms ,Articles ,Middle Aged ,Prostate-Specific Antigen ,Early Detection of Cancer ,Retrospective Studies - Abstract
Background Despite higher risks associated with prostate cancer, young African American men are poorly represented in prostate-specific antigen (PSA) trials, which limits proper evidence-based guidance. We evaluated the impact of PSA screening, alongside primary care provider utilization, on prostate cancer outcomes for these patients. Methods We identified African American men aged 40-55 years, diagnosed with prostate cancer between 2004 and 2017 within the Veterans Health Administration. Inverse probability of treatment-weighted propensity scores were used in multivariable models to assess PSA screening on PSA levels higher than 20, Gleason score of 8 or higher, and metastatic disease at diagnosis. Lead-time adjusted Fine-Gray regression evaluated PSA screening on prostate cancer–specific mortality (PCSM), with noncancer death as competing events. All statistical tests were 2-sided. Results The cohort included 4726 patients. Mean age was 51.8 years, with 84-month median follow-up. There were 1057 (22.4%) with no PSA screening prior to diagnosis. Compared with no screening, PSA screening was associated with statistically significantly reduced odds of PSA levels higher than 20 (odds ratio [OR] = 0.56, 95% confidence interval [CI] = 0.49 to 0.63; P < .001), Gleason score of 8 or higher (OR = 0.78, 95% CI = 0.69 to 0.88; P < .001), and metastatic disease at diagnosis (OR = 0.50, 95% CI = 0.39 to 0.64; P < .001), and decreased PCSM (subdistribution hazard ratio = 0.52, 95% CI = 0.36 to 0.76; P < .001). Primary care provider visits displayed similar effects. Conclusions Among young African American men diagnosed with prostate cancer, PSA screening was associated with statistically significantly lower risk of PSA levels higher than 20, Gleason score of 8 or higher, and metastatic disease at diagnosis and statistically significantly reduced risk of PCSM. However, the retrospective design limits precise estimation of screening effects. Prospective studies are needed to validate these findings.
- Published
- 2021
15. An Estimation of Top-Down NOx Emissions from OMI Sensor Over East Asia
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Kyung M. Han, Hyun S. Kim, and Chul H. Song
- Subjects
top-down NOx emission ,lifetime of column NOx ,NOx transport ,OMI sensor ,Science - Abstract
This study focuses on the estimation of top-down NOx emissions over East Asia, integrating information on the levels of NO2 and NO, wind vector, and geolocation from Ozone Monitoring Instrument (OMI) observations and Weather Research and Forecasting (WRF)-Community Multiscale Air Quality (CMAQ) model simulations. An algorithm was developed based on mass conservation to estimate the 30 km × 30 km resolved top-down NOx emissions over East Asia. In particular, the algorithm developed in this study considered two main atmospheric factors—(i) NOx transport from/to adjacent cells and (ii) calculations of the lifetimes of column NOx (τ). In the sensitivity test, the analysis showed the improvements in the top-down NOx estimation via filtering the data (τ ≤ 2 h). The best top-down NOx emissions were inferred after the sixth iterations. Those emissions were 11.76 Tg N yr−1 over China, 0.13 Tg N yr−1 over North Korea, 0.46 Tg N yr−1 over South Korea, and 0.68 Tg N yr−1 over Japan. These values are 34%, 62%, 60%, and 47% larger than the current bottom-up NOx emissions over these countries, respectively. A comparison between the CMAQ-estimated and OMI-retrieved NO2 columns was made to confirm the accuracy of the newly estimated NOx emission. The comparison confirmed that the estimated top-down NOx emissions showed better agreements with observations (R2 = 0.88 for January and 0.81 for July).
- Published
- 2020
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16. Elucidating the cellular uptake mechanisms of heptamethine cyanine dye analogues for their use as an anticancer drug-carrier molecule for the treatment of glioblastoma
- Author
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Elizabeth Cooper, Peter J. Choi, Kihwan Hwang, Kyung M. Nam, Chae‐Yong Kim, Tina Shaban, Patrick Schweder, Edward Mee, Jason Correia, Clinton Turner, Richard L. M. Faull, William A. Denny, Katsuya Noguchi, Mike Dragunow, Jiney Jose, and Thomas I.‐H. Park
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Pharmacology ,Drug Discovery ,Organic Chemistry ,Molecular Medicine ,Biochemistry - Abstract
The development of chemotherapies for glioblastoma is hindered by their limited bioavailability and toxicity on normal brain function. To overcome these limitations, we investigated the structure-dependent activity of heptamethine cyanine dyes (HMCD), a group of tumour-specific and BBB permeable near-infrared fluorescent dyes, in both commercial (U87MG) and patient-derived GBM cell lines. HMCD analogues with strongly ionisable sulphonic acid groups were not taken up by patient-derived GBM cells, but were taken up by the U87MG cell line. HMCD uptake relies on a combination of transporter uptake through organic anion-transporting polypeptides (OATPs) and endocytosis into GBM cells. The uptake of HMCDs was not affected by p-glycoprotein efflux in GBM cells. Finally, we demonstrate structure-dependent cytotoxic activity at high concentrations (EC
- Published
- 2022
17. Synergistic combination of information from ground observations, geostationary satellite, and air quality modeling towards improved PM2.5 predictability.
- Author
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Yu, Jinhyeok, Song, Chul H., Lee, Dogyeong, Lee, Sojin, Kim, Hyun S., Han, Kyung M., Park, Seohui, Im, Jungho, Park, Soon-Young, Jeon, Moongu, Peuch, Vincent-Henri, Saide, Pablo E., Carmichael, Gregory R., Kim, Jeeho, Kim, Jhoon, Song, Chang-Keun, Woo, Jung-Hun, and Ryu, Seong-Hyun
- Subjects
AIR quality ,GEOSTATIONARY satellites ,PARTICULATE matter ,STATISTICAL correlation ,ORBITS (Astronomy) - Abstract
Concentrations of ambient particulate matter (such as PM
2.5 and PM10 ) have come to represent a serious environmental problem worldwide, causing many deaths and economic losses. Because of the detrimental effects of PM2.5 on human health, many countries and international organizations have developed and operated regional and global short-term PM2.5 prediction systems. The short-term predictability of PM2.5 (and PM10 ) is determined by two main factors: the performance of the air quality model and the precision of the initial states. While specifically focusing on the latter factor, this study attempts to demonstrate how information from classical ground observation networks, a state-of-the-art geostationary (GEO) satellite sensor, and an advanced air quality modeling system can be synergistically combined to improve short-term PM2.5 predictability over South Korea. Such a synergistic combination of information can effectively overcome the major obstacle of scarcity of information, which frequently occurs in PM2.5 prediction systems using low Earth orbit (LEO) satellite-borne observations. This study first presents that the scarcity of information is mainly associated with cloud masking, sun-glint effect, and ill-location of satellite-borne data, and it then demonstrates that an advanced air quality modeling system equipped with synergistically-combined information can achieve substantially improved performances, producing enhancements of approximately 10%, 19%, 29%, and 10% in the predictability of PM2.5 over South Korea in terms of index of agreement (IOA), correlation coefficient (R), mean biases (MB), and hit rate (HR), respectively, compared to PM2.5 prediction systems using only LEO satellite-derived observations. [ABSTRACT FROM AUTHOR]- Published
- 2023
- Full Text
- View/download PDF
18. Temporal Analysis of OMI-Observed Tropospheric NO2 Columns over East Asia during 2006–2015
- Author
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Kyung M. Han
- Subjects
tropospheric no2 column ,satellite sensor ,year-to-year variation of no2 ,monthly variation of no2 ,weekly variation of no2 ,nox emission ,Meteorology. Climatology ,QC851-999 - Abstract
The study analyzed temporal variations of Ozone Monitoring Instrument (OMI)-observed NO2 columns, interregional correlation, and comparison between NO2 columns and NOx emissions during the period from 2006 to 2015. Regarding the trend of the NO2 columns, the linear lines were classified into four groups: (1) ‘upward and downward’ over six defined geographic regions in central-east Asia; (2) ‘downward’ over Guangzhou, Japan, and Taiwan; (3) ‘stagnant’ over South Korea; and (4) ‘upward’ over North Korea, Mongolia, Qinghai, and Northwestern Pacific ocean. In particular, the levels of NO2 columns in 2015 returned to those in 2006 over most of the polluted regions in China. Quantitatively, their relative changes in 2015 compared to 2006 were approximately 10%. From the interregional correlation analysis, it was found that unlike positive relationships between the polluted areas, the different variations of monthly NO2 columns led to negative relationships in Mongolia and Qinghai. Regarding the comparison between NO2 columns and NOx emission, the NOx emissions from the Copernicus Atmosphere Monitoring Service (CAMS) and Clean Air Policy Support System (CAPSS) inventories did not follow the year-to-year variations of NO2 columns over the polluted regions. In addition, the weekly effect was only clearly shown in South Korea, Japan, and Taiwan, indicating that the amounts of NOx emissions are significantly contributed to by the transportation sector.
- Published
- 2019
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- View/download PDF
19. Evaluation of biogenic emissions from three different vegetation distributions in South Korea
- Author
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Jinhyeok Yu, Kyung M. Han, Chul H. Song, Kyunghwa Lee, Sojin Lee, Younha Kim, Jung-Hun Woo, Saewung Kim, and Armin Wisthaler
- Subjects
Atmospheric Science ,General Environmental Science - Published
- 2023
20. Crop Residue Burning Emissions and the Impact on Ambient Particulate Matters over South Korea
- Author
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Han, Kyung M., primary, Lee, Byung T., additional, Bae, Min-Suk, additional, Lee, Sojin, additional, Jung, Chang H., additional, and Kim, Hyun S., additional
- Published
- 2022
- Full Text
- View/download PDF
21. Serum adipocyte fatty acid–binding protein, retinol-binding protein 4, and adiponectin concentrations in relation to the development of the metabolic syndrome in Korean boys: a 3-y prospective cohort study
- Author
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Choi, Kyung M, Yannakoulia, Mary, Park, Min S, Cho, Geum J, Kim, Jung H, Lee, Seung H, Hwang, Taik G, Yang, Sei J, Kim, Tai N, Yoo, Hye J, Baik, Sai H, Kim, Seon M, and Mantzoros, Christos S
- Published
- 2011
- Full Text
- View/download PDF
22. Evaluating Prostate-Specific Antigen Screening for Young African American Men With Cancer
- Author
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Qiao, Edmund M, primary, Lynch, Julie A, additional, Lee, Kyung M, additional, Kotha, Nikhil V, additional, Nalawade, Vinit, additional, Voora, Rohith S, additional, Qian, Alexander S, additional, Nelson, Tyler J, additional, Yamoah, Kosj, additional, Garraway, Isla P, additional, Stewart, Tyler F, additional, Parsons, J Kellogg, additional, and Rose, Brent S, additional
- Published
- 2021
- Full Text
- View/download PDF
23. Development of a CNN+LSTM Hybrid Neural Network for Daily PM 2.5 Prediction.
- Author
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Kim, Hyun S., Han, Kyung M., Yu, Jinhyeok, Kim, Jeeho, Kim, Kiyeon, and Kim, Hyomin
- Subjects
- *
CONVOLUTIONAL neural networks , *GEOPOTENTIAL height - Abstract
A CNN+LSTM (Convolutional Neural Network + Long Short-Term Memory) based deep hybrid neural network was established for the citywide daily PM2.5 prediction in South Korea. The structural hyperparameters of the CNN+LSTM model were determined through comprehensive sensitivity tests. The input features were obtained from the ground observations and GFS forecast. The performance of CNN+LSTM was evaluated by comparison with PM2.5 observations and with the 3-D CTM (three-dimensional chemistry transport model)-predicted PM2.5. The newly developed hybrid model estimated more accurate ambient levels of PM2.5 compared to the 3-D CTM. For example, the error and bias of the CNN+LSTM prediction were 1.51 and 6.46 times smaller than those by 3D-CTM simulation. In addition, based on IOA (Index of Agreement), the accuracy of CNN+LSTM prediction was 1.10–1.18 times higher than the 3-D CTM-based prediction. The importance of input features was indirectly investigated by sequential perturbing input variables. The most important meteorological and atmospheric environmental features were geopotential height and previous day PM2.5. The obstacles of the current CNN+LSTM-based PM2.5 prediction were also discussed. The promising result of this study indicates that DNN-based models can be utilized as an effective tool for air quality prediction. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
- View/download PDF
24. Capital Market Returns to New Product Development Success: Informational Effects on Product Market Advertising
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Pradeep K. Chintagunta, Inho Suk, and Kyung M. Park
- Subjects
Marketing ,Economics and Econometrics ,Product market ,business.industry ,05 social sciences ,Monetary economics ,050105 experimental psychology ,0502 economics and business ,New product development ,050211 marketing ,0501 psychology and cognitive sciences ,Business and International Management ,business ,Capital market ,health care economics and organizations ,Stock (geology) - Abstract
The authors aim to answer the following question: If the capital market reacts with abnormal stock returns to new product development success events, do these returns influence subsequent marketing decisions? Drawing on informational market feedback and managerial learning theories, the authors posit that when firms are uncertain about how responsive the product market will be to their marketing activities, signals received from the capital market help them update their beliefs about the product market’s responsiveness. In the pharmaceutical context, the authors decompose the abnormal returns at a new drug approval event into components that the firm can and cannot predict (i.e., predicted and unpredicted abnormal returns) and find that the postapproval advertising budget is larger when unpredicted abnormal approval returns are higher. Furthermore, this tendency is more pronounced for spending on detailing than for direct-to-consumer advertising. Consistent with these higher budgets, the authors find that postlaunch advertising is more effective when unpredicted abnormal approval returns are higher, particularly for detailing spending (vs. direct-to-consumer advertising). Overall, this study suggests that information flows from the capital market’s initial perceptions at new product introduction play an important role in subsequent marketing decisions in the product market.
- Published
- 2018
25. Data Assimilation of AOD and Estimation of Surface Particulate Matters over the Arctic
- Author
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Han, Kyung M., primary, Jung, Chang H., additional, Park, Rae-Seol, additional, Park, Soon-Young, additional, Lee, Sojin, additional, Kulmala, Markku, additional, Petäjä, Tuukka, additional, Karasiński, Grzegorz, additional, Sobolewski, Piotr, additional, Yoon, Young Jun, additional, Lee, Bang Young, additional, Kim, Kiyeon, additional, and Kim, Hyun S., additional
- Published
- 2021
- Full Text
- View/download PDF
26. Discovery of 318 new risk loci for type 2 diabetes and related vascular outcomes among 1.4 million participants in a multi-ancestry meta-analysis
- Author
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Marijana, Vujkovic, Jacob M, Keaton, Julie A, Lynch, Donald R, Miller, Jin, Zhou, Catherine, Tcheandjieu, Jennifer E, Huffman, Themistocles L, Assimes, Kimberly, Lorenz, Xiang, Zhu, Austin T, Hilliard, Renae L, Judy, Jie, Huang, Kyung M, Lee, Derek, Klarin, Saiju, Pyarajan, John, Danesh, Olle, Melander, Asif, Rasheed, Nadeem H, Mallick, Shahid, Hameed, Irshad H, Qureshi, Muhammad Naeem, Afzal, Uzma, Malik, Anjum, Jalal, Shahid, Abbas, Xin, Sheng, Long, Gao, Klaus H, Kaestner, Katalin, Susztak, Yan V, Sun, Scott L, DuVall, Kelly, Cho, Jennifer S, Lee, J Michael, Gaziano, Lawrence S, Phillips, James B, Meigs, Peter D, Reaven, Peter W, Wilson, Todd L, Edwards, Daniel J, Rader, Scott M, Damrauer, Christopher J, O'Donnell, Philip S, Tsao, Kyong-Mi, Chang, Benjamin F, Voight, and Sumitra, Muralidhar
- Subjects
Oncology ,Male ,medicine.medical_specialty ,endocrine system diseases ,Type 2 diabetes ,Disease ,Biology ,Polymorphism, Single Nucleotide ,Risk Assessment ,Article ,Diabetes Complications ,03 medical and health sciences ,0302 clinical medicine ,Internal medicine ,Diabetes mellitus ,Genetics ,medicine ,Genetic predisposition ,Humans ,Hypoglycemic Agents ,Genetic Predisposition to Disease ,Genetic Association Studies ,030304 developmental biology ,Genetic association ,0303 health sciences ,Chromosomes, Human, X ,nutritional and metabolic diseases ,medicine.disease ,Black or African American ,Europe ,Diabetes Mellitus, Type 2 ,Meta-analysis ,Medical genetics ,Female ,030217 neurology & neurosurgery ,Diabetic Angiopathies ,Kidney disease - Abstract
We investigated type 2 diabetes (T2D) genetic susceptibility via multi-ancestry meta-analysis of 228,499 cases and 1,178,783 controls in the Million Veteran Program (MVP), DIAMANTE, Biobank Japan and other studies. We report 568 associations, including 286 autosomal, 7 X-chromosomal and 25 identified in ancestry-specific analyses that were previously unreported. Transcriptome-wide association analysis detected 3,568 T2D associations with genetically predicted gene expression in 687 novel genes; of these, 54 are known to interact with FDA-approved drugs. A polygenic risk score (PRS) was strongly associated with increased risk of T2D-related retinopathy and modestly associated with chronic kidney disease (CKD), peripheral artery disease (PAD) and neuropathy. We investigated the genetic etiology of T2D-related vascular outcomes in the MVP and observed statistical SNP-T2D interactions at 13 variants, including coronary heart disease (CHD), CKD, PAD and neuropathy. These findings may help to identify potential therapeutic targets for T2D and genomic pathways that link T2D to vascular outcomes.
- Published
- 2019
27. Photopatternable silicon elastomers with enhanced mechanical properties for high-fidelity nanoresolution soft lithography
- Author
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Kyung M. Choi
- Subjects
Elastomers -- Chemical properties ,Silicon compounds -- Chemical properties ,Chemicals, plastics and rubber industries - Abstract
A new version of functional stamp materials with adjustable physical toughness was developed for advanced soft lithography. As a result the photopatternable silicon elastomers with enhanced mechanical properties for high-fidelity nanoresolution soft lithography were demonstrated.
- Published
- 2005
28. Effect of Ion Concentration on the Electro-Optic Response in Polymer-Stabilized Cholesteric Liquid Crystals
- Author
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Lee, Kyung M., primary, Bunning, Timothy J., additional, White, Timothy J., additional, McConney, Michael E., additional, and Godman, Nicholas P., additional
- Published
- 2020
- Full Text
- View/download PDF
29. Evaluating Prostate-Specific Antigen Screening for Young African American Men With Cancer.
- Author
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Qiao, Edmund M, Lynch, Julie A, Lee, Kyung M, Kotha, Nikhil V, Nalawade, Vinit, Voora, Rohith S, Qian, Alexander S, Nelson, Tyler J, Yamoah, Kosj, Garraway, Isla P, Stewart, Tyler F, Parsons, J Kellogg, and Rose, Brent S
- Subjects
RETROSPECTIVE studies ,EARLY detection of cancer ,PROSTATE-specific antigen ,PROSTATE tumors ,AFRICAN Americans - Abstract
Background: Despite higher risks associated with prostate cancer, young African American men are poorly represented in prostate-specific antigen (PSA) trials, which limits proper evidence-based guidance. We evaluated the impact of PSA screening, alongside primary care provider utilization, on prostate cancer outcomes for these patients.Methods: We identified African American men aged 40-55 years, diagnosed with prostate cancer between 2004 and 2017 within the Veterans Health Administration. Inverse probability of treatment-weighted propensity scores were used in multivariable models to assess PSA screening on PSA levels higher than 20, Gleason score of 8 or higher, and metastatic disease at diagnosis. Lead-time adjusted Fine-Gray regression evaluated PSA screening on prostate cancer-specific mortality (PCSM), with noncancer death as competing events. All statistical tests were 2-sided.Results: The cohort included 4726 patients. Mean age was 51.8 years, with 84-month median follow-up. There were 1057 (22.4%) with no PSA screening prior to diagnosis. Compared with no screening, PSA screening was associated with statistically significantly reduced odds of PSA levels higher than 20 (odds ratio [OR] = 0.56, 95% confidence interval [CI] = 0.49 to 0.63; P < .001), Gleason score of 8 or higher (OR = 0.78, 95% CI = 0.69 to 0.88; P < .001), and metastatic disease at diagnosis (OR = 0.50, 95% CI = 0.39 to 0.64; P < .001), and decreased PCSM (subdistribution hazard ratio = 0.52, 95% CI = 0.36 to 0.76; P < .001). Primary care provider visits displayed similar effects.Conclusions: Among young African American men diagnosed with prostate cancer, PSA screening was associated with statistically significantly lower risk of PSA levels higher than 20, Gleason score of 8 or higher, and metastatic disease at diagnosis and statistically significantly reduced risk of PCSM. However, the retrospective design limits precise estimation of screening effects. Prospective studies are needed to validate these findings. [ABSTRACT FROM AUTHOR]- Published
- 2022
- Full Text
- View/download PDF
30. Direct Binding to NLRP3 Pyrin Domain as a Novel Strategy to Prevent NLRP3‐Driven Inflammation and Gouty Arthritis
- Author
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Yang, Gabsik, primary, Lee, Hye E., additional, Moon, Su‐Jin, additional, Ko, Kyung M., additional, Koh, Jung H., additional, Seok, Jin K., additional, Min, Jun‐Ki, additional, Heo, Tae‐Hwe, additional, Kang, Han C., additional, Cho, Yong‐Yeon, additional, Lee, Hye S., additional, Fitzgerald, Katherine A., additional, and Lee, Joo Y., additional
- Published
- 2020
- Full Text
- View/download PDF
31. A genomic insight on the species boundaries in Hyles euphorbiae group of hawkmoths: are DNA barcodes failing in telling good species apart?
- Author
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Mutanen, Marko, Lee, Kyung M., and Hundsdoerfer, Anna
- Subjects
DNA sequencing -- Methods ,Sphingidae -- Identification and classification ,Biological sciences - Abstract
Background: The hawkmoth genus Hyles Hubner, 1819 (Lepidoptera: Sphingidae) comprises 32 species globally. Their taxonomy has proven to be difficult to elucidate because of wide distributions of many species, morphological [...]
- Published
- 2017
- Full Text
- View/download PDF
32. Development of a daily PM10 and PM2.5 prediction system using a deep long short-term memory neural network model
- Author
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Kim, Hyun S., Park, Inyoung, Song, Chul H., Lee, Kyunghwa, Yun, Jae W., Kim, Hong K., Jeon, Moongu, Lee, Jiwon, and Han, Kyung M.
- Abstract
A deep recurrent neural network system based on a long short-term memory (LSTM) model was developed for daily PM10 and PM2.5 predictions in South Korea. The structural and learnable parameters of the newly developed system were optimized from iterative model training. Independent variables were obtained from ground-based observations over 2.3 years. The performance of the particulate matter (PM) prediction LSTM was then evaluated by comparisons with ground PM observations and with the PM concentrations predicted from two sets of 3-D chemistry-transport model (CTM) simulations (with and without data assimilation for initial conditions). The comparisons showed, in general, better performance with the LSTM than with the 3-D CTM simulations. For example, in terms of IOAs (index of agreements), the PM prediction IOAs were enhanced from 0.36–0.78 with the 3-D CTM simulations to 0.62–0.79 with the LSTM-based model. The deep LSTM-based PM prediction system developed at observation sites is expected to be further integrated with 3-D CTM-based prediction systems in the future. In addition to this, further possible applications of the deep LSTM-based system are discussed, together with some limitations of the current system.
- Published
- 2019
33. Voluntary exercise normalizes the proteomic landscape in muscle and brain and improves the phenotype of progeroid mice
- Author
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David A. Sinclair, Jaime M. Ross, Lars Olson, Rui M. M. Branca, Giuseppe Coppotelli, Kyung M. Kim, and Janne Lehtiö
- Subjects
Male ,Proteomics ,0301 basic medicine ,Premature aging ,Aging ,medicine.medical_specialty ,Mitochondrial DNA ,Protein subunit ,Oxidative phosphorylation ,Biology ,Mitochondrion ,DNA, Mitochondrial ,Mice ,03 medical and health sciences ,0302 clinical medicine ,Physical Conditioning, Animal ,Internal medicine ,medicine ,Animals ,Muscle, Skeletal ,exercise ,mtDNA ,Brain ,Original Articles ,Cell Biology ,Phenotype ,Mice, Mutant Strains ,mitochondria ,Citric acid cycle ,030104 developmental biology ,Endocrinology ,Mutation ,Female ,Original Article ,PolG ,030217 neurology & neurosurgery - Abstract
The accumulation of mitochondrial DNA (mtDNA) mutations is a suspected driver of aging and age‐related diseases, but forestalling these changes has been a major challenge. One of the best‐studied models is the prematurely aging mtDNA mutator mouse, which carries a homozygous knock‐in of a proofreading deficient version of the catalytic subunit of mtDNA polymerase‐γ (PolgA). We investigated how voluntary exercise affects the progression of aging phenotypes in this mouse, focusing on mitochondrial and protein homeostasis in both brain and peripheral tissues. Voluntary exercise significantly ameliorated several aspects of the premature aging phenotype, including decreased locomotor activity, alopecia, and kyphosis, but did not have major effects on the decreased lifespan of mtDNA mutator mice. Exercise also decreased the mtDNA mutation load. In‐depth tissue proteomics revealed that exercise normalized the levels of about half the proteins, with the majority involved in mitochondrial function and nuclear–mitochondrial crosstalk. There was also a specific increase in the nuclear‐encoded proteins needed for the tricarboxylic acid cycle and complex II, but not in mitochondrial‐encoded oxidative phosphorylation proteins, as well as normalization of enzymes involved in coenzyme Q biosynthesis. Furthermore, we found tissue‐specific alterations, with brain coping better as compared to muscle and with motor cortex being better protected than striatum, in response to mitochondrial dysfunction. We conclude that voluntary exercise counteracts aging in mtDNA mutator mice by counteracting protein dysregulation in muscle and brain, decreasing the mtDNA mutation burden in muscle, and delaying overt aging phenotypes.
- Published
- 2019
34. Palmar hyperhidrosis: Evidence of genetic transmission
- Author
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Ro, Kyung M., Cantor, Rita M., Lange, Kenneth L., and Ahn, Samuel S.
- Published
- 2002
35. Extension and validation of an unsteady wake model for rotors
- Author
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Ay Su, Yoo, Kyung M., and Peters, David A.
- Subjects
Rotors (Helicopters) -- Research ,Aerodynamics -- Research ,Aerospace and defense industries ,Business ,Science and technology - Abstract
A new model regarding the three dimensional, finite-state induced-flow is developed to include nonlinearities associated with the mass flow through the helicopter rotor plane. This is then applied to to the calculation of the induced-flow of a rotor in axial flow during an experiment conducted at the Georgia Institute of Technology. The new model shows excellent capabilities in predicting unsteady load characteristics typical of common aeroelastic response.
- Published
- 1992
36. Association Between Genetic Variation in Blood Pressure and Increased Lifetime Risk of Peripheral Artery Disease.
- Author
-
Levin, Michael G., Klarin, Derek, Walker, Venexia M., Gill, Dipender, Lynch, Julie, Hellwege, Jacklyn N., Keaton, Jacob M., Lee, Kyung M., Assimes, Themistocles L., Natarajan, Pradeep, Hung, Adriana M., Edwards, Todd L., Rader, Daniel J., Gaziano, J. Michael, Davies, Neil M., Tsao, Philip S., Chang, Kyong-Mi, Voight, Benjamin F., and Damrauer, Scott M.
- Published
- 2021
- Full Text
- View/download PDF
37. Temporal Analysis of OMI-Observed Tropospheric NO2 Columns over East Asia during 2006–2015
- Author
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Han, Kyung M., primary
- Published
- 2019
- Full Text
- View/download PDF
38. Development of a daily PM<sub>10</sub> and PM<sub>2.5</sub> prediction system using a deep long short-term memory neural network model
- Author
-
Kim, Hyun S., primary, Park, Inyoung, additional, Song, Chul H., additional, Lee, Kyunghwa, additional, Yun, Jae W., additional, Kim, Hong K., additional, Jeon, Moongu, additional, Lee, Jiwon, additional, and Han, Kyung M., additional
- Published
- 2019
- Full Text
- View/download PDF
39. Voluntary exercise normalizes the proteomic landscape in muscle and brain and improves the phenotype of progeroid mice
- Author
-
Ross, Jaime M., primary, Coppotelli, Giuseppe, additional, Branca, Rui M., additional, Kim, Kyung M., additional, Lehtiö, Janne, additional, Sinclair, David A., additional, and Olson, Lars, additional
- Published
- 2019
- Full Text
- View/download PDF
40. Laparoscopic aortobifemoral bypass
- Author
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Ahn, Samuel S., Hiyama, Darryl T., Rudkin, George H., Fuchs, Gerhard J., Ro, Kyung M., and Concepcion, Blessie
- Published
- 1997
41. Extension and validation of an unsteady wake model for rotors
- Author
-
Su, AY, Yoo, Kyung M, and Peters, David A
- Subjects
Aerodynamics - Abstract
A new three-dimensional, finite-state induced-flow model is extended to treat nonlinearities associated with the mass flow induced through the rotor plane. This new theory is then applied to the correlation of a recent set of unsteady, hover laser Doppler velocimetry inflow measurements conducted in the Aeroelastic Rotor Test Chamber at Georgia Institute of Technology. Although the model is intended primarily as a representation of unsteady aerodynamics for aeroelasticity applications, the results show that it has an excellent capability in predicting the inflow distribution in hover except near the root and tip. In addition, the computed unsteady spanwise lift distribution of a rotor is compared with that from an unsteady vortex lattice method for pitch oscillations at various frequencies. The new model is shown to be capable of prediction of unsteady loads typical of aeroelastic response.
- Published
- 1992
42. Late‐onset extensive haematoma mimicking cellulitis
- Author
-
Baek, Yoo S., primary, Song, Jin Y., additional, Jeong, Kyung M., additional, and Jeon, Jiehyun, additional
- Published
- 2018
- Full Text
- View/download PDF
43. Initiation and Use of Propranolol for Infantile Hemangioma: Report of a Consensus Conference
- Author
-
Robert J. Boucek, Beth A. Drolet, Eulalia Baselga, Leonardo Liberman, Susan G. MacLellan-Tobert, Laura D. Cassidy, Robert H. Chun, Yvonne E. Chiu, Anita N. Haggstrom, Peter C. Frommelt, Denise W. Metry, Dawn H. Siegel, Kristen E. Holland, Robert Sidbury, Francine Blei, Marcia Seefeldt, Kari Martin, Sarah L. Chamlin, Nancy M. Bauman, Ilona J. Frieden, Maria C. Garzon, David H. Darrow, Eun Kyung M. Kwon, Jonathan A. Perkins, Kendra M. Ward, Anthony J. Mancini, Shawna Joachim, and Katherine B. Puttgen
- Subjects
Research Report ,Bradycardia ,medicine.medical_specialty ,Pediatrics ,hypertension ,Consensus Development Conferences as Topic ,MEDLINE ,infantile hemangioma ,Propranolol ,Hypoglycemia ,Cardiovascular ,Medical and Health Sciences ,bradycardia ,Hemangioma ,Special Article ,Clinical Research ,medicine ,Humans ,propranolol ,Pediatric ,PHACE syndrome ,business.industry ,Psychology and Cognitive Sciences ,Consensus conference ,Infant ,Neurovascular bundle ,medicine.disease ,Vascular Neoplasms ,Surgery ,hypoglycemia ,Clinical research ,Pediatrics, Perinatology and Child Health ,Congenital Structural Anomalies ,medicine.symptom ,business ,medicine.drug - Abstract
Infantile hemangiomas (IHs) are common neoplasms composed of proliferating endothelial-like cells. Despite the relative frequency of IH and the potential severity of complications, there are currently no uniform guidelines for treatment. Although propranolol has rapidly been adopted, there is significant uncertainty and divergence of opinion regarding safety monitoring, dose escalation, and its use in PHACE syndrome (PHACE = posterior fossa, hemangioma, arterial lesions, cardiac abnormalities, eye abnormalities; a cutaneous neurovascular syndrome characterized by large, segmental hemangiomas of the head and neck along with congenital anomalies of the brain, heart, eyes and/or chest wall). A consensus conference was held on December 9, 2011. The multidisciplinary team reviewed existing data on the pharmacologic properties of propranolol and all published reports pertaining to the use of propranolol in pediatric patients. Workgroups were assigned specific topics to propose protocols on the following subjects: contraindications, special populations, pretreatment evaluation, dose escalation, and monitoring. Consensus protocols were recorded during the meeting and refined after the meeting. When appropriate, protocol clarifications and revision were made and agreed upon by the group via teleconference. Because of the absence of high-quality clinical research data, evidence-based recommendations are not possible at present. However, the team agreed on a number of recommendations that arose from a review of existing evidence, including when to treat complicated IH; contraindications and pretreatment evaluation protocols; propranolol use in PHACE syndrome; formulation, target dose, and frequency of propranolol; initiation of propranolol in infants; cardiovascular monitoring; ongoing monitoring; and prevention of hypoglycemia. Where there was considerable controversy, the more conservative approach was selected. We acknowledge that the recommendations are conservative in nature and anticipate that they will be revised as more data are made available. Pediatrics 2013;131:128-140
- Published
- 2013
44. MODELING TERAHERTZ DIFFUSE SCATTERING FROM GRANULAR MEDIA USING RADIATIVE TRANSFER THEORY
- Author
-
Kyung M. Nam, Scott Schecklman, and Lisa M. Zurk
- Subjects
Materials science ,Terahertz radiation ,business.industry ,Scattering ,Condensed Matter Physics ,Spectral line ,Electronic, Optical and Magnetic Materials ,Terahertz spectroscopy and technology ,Optics ,Radiative transfer ,SPHERES ,Electrical and Electronic Engineering ,Spectroscopy ,business ,Intensity (heat transfer) - Abstract
Terahertz (THz) spectroscopy can potentially be used to probe and characterize inhomogeneous materials. However, identiflca- tion of spectral features from difiuse scattering by inhomogeneous ma- terials has not received much attention until now. In this paper, THz difiuse scattering from granular media is modeled by applying radiative transfer (RT) theory for the flrst time in THz sensing. The difiuse scat- tered fleld from compressed polyethylene (PE) pellets containing steel spheres was measured in both transmission and re∞ection modes using a THz time domain spectroscopy (THz-TDS) system. The RT model was validated by successfully reproducing qualitative features observed in experimental results. Difiuse intensity from granular media contain- ing lactose was then simulated using RT theory. In the results, spectral features of lactose were observed in the difiuse intensity spectra from the granular media.
- Published
- 2012
45. A Comparison of Primary Sclerosing Cholangitis with and Without Associated Inflammatory Bowel Disease: Data from the Pediatric PSC Consortium
- Author
-
Ricciuto, Amanda, primary, Kamath, Binita M., additional, Abdou, Reham, additional, Alqoaer, Khaled, additional, Amin, Mansi, additional, Amir, Achiya Z., additional, Auth, Marcus, additional, Bazerbachi, Fateh, additional, Broderick, Annemarie, additional, Chan, Albert, additional, Cotter, Jillian, additional, Doan, Sylvia, additional, El-Matary, Wael, additional, El-Youssef, Mounif, additional, Ferrari, Federica, additional, Furuya, Katryn, additional, Gottrand, Madeleine, additional, Gottrand, Frederic, additional, Gupta, Nitika, additional, Homan, Matjaz, additional, Jensen, M.K., additional, Kim, Kyung M., additional, Kaija-Leena Kolho, Kaija-Leena Kola, additional, Konidari, Anastasia, additional, Koot, Bart, additional, Iorio, Raffaele, additional, Ledder, Oren, additional, Mack, Cara L., additional, Martinez, Mercedes, additional, Miloh, Tamir, additional, Mohan, Parvathi, additional, O'Cathain, Niamh, additional, Papadopoulou, Alexandra, additional, Sathya, Pushpa, additional, Saubermann, Lawrence, additional, Shteyer, Eyal, additional, Tanaka, Atsushi, additional, Varier, Raghu, additional, Valentino, Pamela L., additional, Venkat, Veena, additional, Vitola, Bernadette E., additional, Vos, Miriam B., additional, Vratislav, Smolka, additional, Woynarowski, Marek, additional, Yap, Jason Y., additional, and Deneau, Mark R., additional
- Published
- 2017
- Full Text
- View/download PDF
46. Recurrence of Primary Sclerosing Cholangitis after Liver Transplantation in Children: Data from the Pediatric PSC Consortium
- Author
-
Bazerbachi, Fateh, primary, Furuya, Katryn, additional, Abdou, Reham, additional, Alqoaer, Khaled, additional, Amin, Mansi, additional, Amir, Achiya Z., additional, Auth, Marcus, additional, Broderick, Annemarie, additional, Chan, Albert, additional, Cotter, Jillian, additional, Doan, Sylvia, additional, El-Matary, Wael, additional, El-Youssef, Mounif, additional, Ferrari, Federica, additional, Gottrand, Madeleine, additional, Gottrand, Frederic, additional, Gupta, Nitika, additional, Homan, Matjaz, additional, Jensen, M.K., additional, Kamath, Binita M., additional, Kim, Kyung M., additional, Kolho, Kaija-Leena Kola Kaija-Leena, additional, Konidari, Anastasia, additional, Koot, Bart, additional, Iorio, Raffaele, additional, Ledder, Oren, additional, Mack, Cara L., additional, Martinez, Mercedes, additional, Miloh, Tamir, additional, Mohan, Parvathi, additional, O'Cathain, Niamh, additional, Papadopoulou, Alexandra, additional, Ricciuto, Amanda, additional, Saubermann, Lawrence, additional, Sathya, Pushpa, additional, Shteyer, Eyal, additional, Tanaka, Atsushi, additional, Varier, Raghu, additional, Valentino, Pamela L., additional, Venkat, Veena, additional, Vitola, Bernadette E., additional, Vos, Miriam B., additional, Vratislav, Smolka, additional, Woynarowski, Marek, additional, Yap, Jason Y., additional, and Deneau, Mark R., additional
- Published
- 2017
- Full Text
- View/download PDF
47. Ozone production efficiency of a ship-plume: ITCT 2K2 case study
- Author
-
Kim, Hyun S., primary, Kim, Yong H., additional, Han, Kyung M., additional, Kim, Jhoon, additional, and Song, Chul H., additional
- Published
- 2016
- Full Text
- View/download PDF
48. Copy Number Variation Analysis in 98 Individuals with PHACE Syndrome
- Author
-
Susan J. Hayflick, Pui-Yan Kwok, William B. Dobyns, Pinar Bayrak-Toydemir, Sheri Mitchell, Beth A. Drolet, Beth Wilmot, Elizabeth A. Worthey, Elena Pope, Rachel Lorier, Johannes Fredrik Grimmer, Shannon K. McWeeney, Maria R. Cordisco, Denise W. Metry, Ulrich Broeckel, Eun Kyung M. Kwon, Jennifer L. Santoro, Francine Blei, David A. Stevenson, Ilona J. Frieden, Kelly J. Duffy, Joseph T. Shieh, Dawn H. Siegel, Alfons Krol, Andrea Matter, David L Gibbs, Maria C. Garzon, and Eulalia Baselga
- Subjects
Adult ,Male ,congenital, hereditary, and neonatal diseases and abnormalities ,Adolescent ,DNA Copy Number Variations ,Genotyping Techniques ,Coarctation of the aorta ,Dermatology ,Biology ,Biochemistry ,Article ,Aortic Coarctation ,03 medical and health sciences ,Young Adult ,0302 clinical medicine ,Posterior fossa malformations ,Dna genetics ,medicine ,Humans ,Copy-number variation ,Eye Abnormalities ,Child ,Molecular Biology ,030304 developmental biology ,Genetics ,0303 health sciences ,PHACE syndrome ,Neurocutaneous Syndromes ,Extramural ,copy number variation ,Infant ,Reproducibility of Results ,Cell Biology ,DNA ,PHACES syndrome ,medicine.disease ,Pascual-Castroviejo II syndrome ,Xq28 ,Eye abnormality ,hemangioma ,aortic arch anomaly ,Case-Control Studies ,Child, Preschool ,Female ,030217 neurology & neurosurgery ,Signal Transduction - Abstract
PHACE syndrome is the association of large segmental facial hemangiomas and congenital anomalies, such as posterior fossa malformations, cerebral arterial anomalies, coarctation of the aorta, eye anomalies, and sternal defects. To date, the reported cases of PHACE syndrome have been sporadic, suggesting that PHACE may have a complex pathogenesis. We report here genomic copy number variation (CNV) analysis of 98 individuals with PHACE syndrome as a first step in deciphering a potential genetic basis of PHACE syndrome. A total of 3,772 CNVs (2,507 duplications and 1,265 deletions) were detected in 98 individuals with PHACE syndrome. CNVs were then eliminated if they failed to meet established criteria for quality, spanned centromeres, or did not contain genes. CNVs were defined as "rare" if not documented in the database of genomic variants. Ten rare CNVs were discovered (size range: 134-406 kb), located at 1q32.1, 1q43, 3q26.32-3q26.33, 3p11.1, 7q33, 10q24.32, 12q24.13, 17q11.2, 18p11.31, and Xq28. There were no rare CNV events that occurred in more than one subject. Therefore, further study is needed to determine the significance of these CNVs in the pathogenesis of PHACE syndrome. Journal of Investigative Dermatology (2013) 133, 677-684; doi:10.1038/jid.2012.367; published online 25 October 2012
- Published
- 2013
49. An internal doping method for the preparation of transparent hybrid xerogels containing nano-sized iron particles
- Author
-
Kenneth J. Shea and Kyung M. Choi
- Subjects
Materials science ,Doping ,General Chemistry ,Condensed Matter Physics ,Electronic, Optical and Magnetic Materials ,Biomaterials ,Electron diffraction ,Chemical engineering ,Phase (matter) ,Materials Chemistry ,Ceramics and Composites ,Copolymer ,Composite material ,Hybrid material ,Porosity ,Porous medium ,Deposition (law) - Abstract
Sol-gel copolymerization of iron tricarbonyl-2-(triisopropoxysilyl)-1,3-butadiene with 1,6-bistriethoxysilylhexane and 1,4-bistriethoxysilylbenzene followed by drying produced bridged polysilsesquioxane xerogels. These porous, transparent hybrid materials containing the iron metal precursor were irradiated (UV) and heated under vacuum resulting in the deposition of nano-sized iron particles doped in the xerogels. EDAX and electron diffraction techniques were used to characterize the iron phases. The TEM images of these doped xerogels provided additional information regarding the domain size of the iron phase.
- Published
- 1995
50. Novel Optical Device Materials - Molecular-Level Hybridization
- Author
-
Kyung M. Choi
- Subjects
Molecular level ,Nanocomposite ,Materials science ,Nanotechnology ,Hybrid material - Abstract
Hybrid materials lie at the interface of the organic and inorganic material regimes, where versatility in molecular tailoring approach offers novel molecular modifications in design of new chemical structures. Hybrid materials can also range, depending on the method of formation and domain size, from physical mixtures of inorganic oxides and organics (blends, composites) to nanocomposites and molecular composites that utilize formal chemical linkages between the organic and inorganic domains on the molecular scale.
- Published
- 2012
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