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Comparison of the rheological properties of four root canal sealers

International Journal of Oral Science 2015年第1期7卷 56-61页

作者： Seok woo Chang Young-Kyu lee Qiang Zhu Won Jun Shon woo Cheol lee Kee Yeon Kum Seung Ho Baek In Bog lee Bum-Soon Lim Kwang Shik Bae Department of Conservative Dentistry School of Dentistry Kyung Hee University National Instrumentation Center for Environmental Management Seoul National University Department of Endodontology School of Dental Medicine University of Connecticut Health Center Department of Conservative Dentistry Dental Research Institute School of Dentistry Seoul National University Dental Hospital Seoul National University Dental Research Institute and Department of Dental Biomaterials School of Dentistry Seoul National University

The flowability of a root canal sealer is clinically important because it improves the penetration of the sealer into the complex root canal system. The purpose of this study was to compare the flowabilities of four root canal sealers, measured using the simple press method （ISO 6876）, and their viscosities, measured using a strain-controlled rheometer. A newly developed, calcium phosphate-based root canal sealer （Capseal） and three commercial root canal sealers （AH Plus, Sealapex and Pulp Canal Sealer EWT） were used in this study. The flowabilities of the four root canal sealers were measured using the simple press method （n= 5） and their viscosities were measured using a strain-controlled rheometer （n=5）. The correlation between these two values was statistically analysed using Spearman＇s correlation test. The flow diameters and the viscosities of the root canal sealers were strongly negatively correlated （p= -0.8618）. The viscosity of Pulp Canal Sealer EWT was the lowest and increased in the following order： AH Plus〈Sealapex〈Capseal （P〈0.05）. All of the tested root canal sealers showed characteristic time- and temperature-dependent changes in their rheological properties. The viscosities measured using the strain-controlled rheometer were more precise than the flowabilities measured using the simple press method, suggesting that the rheometer can accurately measure the rheological properties of root canal sealers.

关键词： Capseal rheological property root canal sealer strain-controlled rheometer

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Forest structure and carbon dynamics of an intact lowland mixed dipterocarp forest in Brunei Darussalam

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Journal of Forestry Research 2018年第1期29卷 199-203页

作者： Sohye lee Jongyeol lee Seongjun Kim Yujin Roh Kamariah Abu Salim woo-Kyun lee Yowhan Son Department of Environmental Science and Ecological Engineering Graduate School Korea University Environmental and Life Sciences Faculty of ScienceUniversiti Brunei Darussalam Department of Biological of Environmental Sciences Qatar University

Tropical forests play a critical role in mitigating climate change because they account for large amount o terrestrial carbon storage and ***,there are many uncertainties associated with the estimation o carbon *** estimated forest structure and carbon dynamics along a slope（17.3°–42.8°）and to assess the relations between forest structures,carbon dynamics,and slopes in an intact lowland mixed dipterocarp forest,in Kuala Belalong,Brunei *** biomass,basa area,stand density,crown properties,and tree family composition were measured for forest *** rate,litter production,and litter decomposition rates were also measured for carbon *** crown form index and the crown position index were used to assess crown properties,which we categorized into five stages,from very poor to *** living biomass,basal area and stand density were 261.5–940.7 Mg ha-1,43.6–63.6 m2ha-1and 6,675–8400 tree ha-1,*** average crown form and position index were 4,which means that the crown are mostly symmetrical and sufficiently exposed for *** mean biomass growth rate,litter production,litter decomposition rate were estimated as11.9,11.6 Mg ha-1a-1,and 7.2 g a-1,*** growth rate was significantly correlated with living biomass,basal area,and crown *** form appeared to strongly influence living biomass,basal area and biomass growth rate in terms of light ***,basal area,stand density,crown properties,and biomass growth rate did not vary by slope or tree family *** results indicate that carbon accumulation by tree growth in an intact lowland mixed dipterocarp forest depends on crown *** of any effect of tree family composition on carbon accumulation suggests that the main driver of biomass accumulation in old-growth forests of Borneo is not species-specific characteristics of tree species.

关键词： Carbon dynamics Growth rate Litter flux Lowland mixed dipterocarp forest Slope

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Interfacial Behaviors of Basalt Fiber‑Reinforced Polymeric Composites: A Short Review

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Advanced Fiber Materials 2022年第6期4卷 1414-1433页

作者： Seong‑Hwang Kim Jong‑Hoon lee Jong‑woo Kim Seul‑Yi lee Soo‑Jin Park Department of Chemistry Inha University100 InharoIncheon 22212South Korea

Basalt fibers(BFs)have emerged as a promising thermal insulation material for various applications,such as fireproof clothes/walls and protective equipment in military and civil *** have many desirable characteristics,such as low thermal conductivity,excellent flame resistance,exceptional mechanical strength,facile manipulability,environmental friendliness,and ***,the low intrinsic interfacial properties of BFs due to their chemical inertness and macro-scaled sizes have been a challenge for high performance of BFs-reinforced polymeric composites(BFRPs).Since the mechanical properties of BFRPs significantly depend on the interfacial interaction between the fibers and the matrix,it is critical to understand how incorporating BFs influences the properties of the *** this end,the aim of this review is to report on recent research progress with emphasis on the interfacial behavior in *** relationships between the fiber–matrix interfacial adhesion and the mechanical properties of the BFRPs are briefly described with systematic and up-to-date surface modification techniques summarized into two categories:surface modifications(“wet”and“dry”)and multi-scaled ***,several strategies for increasing the interfacial adhesion of BFs within the polymeric matrix to provide new ideas and insight for future research on the BFRPs are discussed.

关键词： Basalt fibers Polymeric matrix Surface modification Interface

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Risk of ischaemic stroke in patients with transient global amnesia: a propensity-matched cohort study

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Stroke & Vascular Neurology 2022年第2期7卷 101-107页

作者： Sang Hun lee Keon-Yeup Kim Jeong-woo lee So-Jeong Park Jin-Man Jung Department of Neurology Korea University Ansan HospitalKorea University College of MedicineAnsanRepublic of Korea Data Science Team Hanmi Pharm.Co.LtdSeoulRepublic of Korea Korea University Zebrafish Translational Medical Research Center AnsanRepublic of Korea

Background The exact pathophysiological mechanism of transient global amnesia(TGA)is *** is debatable whether TGA is a risk factor for ***,here we investigated the possibility of TGA as a risk factor for stroke in a real-world setting using large-scale nationwide health claims *** We used health claims data from the Korean National Health Insurance Service(NHIS).Patients diagnosed with TGA between 2007 and 2013 were *** initially extracted patients without TGA who were preferentially matched for age and sex with the patients with TGA at a ratio of 10:1 from the whole ***,we performed 1:2 propensity score matching analysis to balance the baseline characteristics between the two *** the propensity score-matched dataset,we performed multivariable Cox regression analysis to investigate the association between TGA and stroke type,including ischaemic,haemorrhagic and all stroke *** Patients with TGA(n=14673)were selected from the NHIS *** extracting from the whole database(n=140486)and propensity score matching their data at a 1:2 ratio,a total of 10448 and 20442 patients were finally assigned to the TGA and control groups,*** multivariable Cox regression analysis demonstrated that the TGA group had a higher risk of ischaemic stroke and all types of stroke(adjusted HR=1.194;95%CI:1.043 to 1.368;and HR=1.197;95%CI:1.056 to 1.357,respectively).Conclusions Analysis of the nationwide claims database showed that TGA could be an important risk factor for stroke,especially for ischaemic stroke.

关键词： patients matched transient

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Estimation of Non-CO_2 GHGs Emissions by Analyzing Burn Severity in the Samcheok Fire,South Korea

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Journal of Mountain Science 2012年第6期9卷 731-741页

作者： WON Myoung Soo KOO Kyo Sang lee Myung Bo lee woo Kyun KANG Kyu-Young Division of Forest Disaster Management Korea Forest Research Institute130712 SeoulRepublic of Korea Faculty of Environmental Science and Ecological Engineering Korea University-Seoul136701 SeoulRepublic of Korea Department of Biological and Environmental Science Dongguk University-Seoul100715 SeoulRepublic of Korea

This study was performed to estimate the emission of non-CO 2 greenhouse gases(GHGs) from biomass burning at a large fire *** extended methodology adopted the IPCC Guidelines(2003) equation for use on data from the Samcheok forest fire gathered using 30 m resolution Landsat TM satellite imagery,digital forest type maps,and growing stock information per hectare by forest type in *** burn ratio(NBR) technique was employed to analyze the area and severity of the Samcheok forest fire that occurred in *** differences between NBR from pre-and post-fire datasets are examined to determine the extent and degree of change detected from *** results of burn severity analysis by dNBR of the Samcheok forest fire area revealed that a total of 16,200 ha of forest were *** proportion of the area characterized by a 'Low' burn severity(dNBR below 152) was 35%,with 'Moderate'(dNBR 153-190) and 'High'(dNBR 191-255) areas were at 33% and 32%,*** combustion efficiency for burn severity was calculated as 0.43 for crown fire where burn severity was 'High',as 0.40 for 'Moderate' severity,and 0.15 for 'Low' severity surface *** emission factors for estimating non-CO 2 GHGs were separately applied to CO 130,CH 4 9,NO x 0.7 and N 2 O ***-CO 2 GHGs emissions from biomass burning in the Samcheok forest fire area were estimated to be CO 44.100,CH 4 3.053,NO x 0.238 and N 2 O 0.038 Gg.

关键词： Biomass burning Non-CO 2 GHGs Normalized burn ratio Combustion efficiency Emission factor Landsat TM

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Work up for the clopidogrel hypersensitivity that led to recognising the undi- agnosed myelodysplastic syndrome

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Journal of Geriatric Cardiology 2016年第3期13卷 274-276页

作者： Yoo Sang Baek Jung woo lee Jiehyun Jeon Department of Dermatology College of Medicine Korea University Seoul South Korea

Antiplatelet therapy with clopidogrel is widely used as a preventive strategy in patients with acute coronary syn- drome, particularly after stent *** mani- festations of clopidogrel hypersensitivity reaction have been reported including cutaneous,and hematologic symp- toms[31 as well as fatal reactions including thrombotic throm- bocytopenic purpura （TTP）.

关键词： Clopidogrel Hypersensitivity Myelodysplastic syndrome

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Association between obesity-related adipokines and colorectal cancer:A case-control study and meta-analysis

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World Journal of Gastroenterology 2014年第24期20卷 7941-7949页

作者： Rakhi Kumari Joshi woo Jin Kim Sang-Ah lee Department of Preventive Medicine Kangwon National University School of MedicineChuncheon-siGangwon-do 200-701South Korea Department of Internal Medicine Kangwon National University School of MedicineChuncheon-siGangwondo 200-701South Korea

AIM: To examine the association between obesity-related adipokines (adiponectin, leptin, resistin, interleukin-6 (IL-6), and tumor necrosis factor-α (TNF-α) and colorectal cancer (CRC) risk.

关键词： Obesity Colorectal cancer Cancer risk Adipokines Obesity-related adipokines

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Targeting transcriptional regulators for treatment of anaplastic thyroid cancer

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Journal of Cancer Metastasis and Treatment 2021年第1期7卷 381-398页

作者： woo Kyung lee Sheue-Yann Cheng Laboratory of Molecular Biology Center for Cancer ResearchNational Cancer InstituteNational Institutes of HealthBethesdaMD 20892USA

Dysregulation of genes perpetuates cancer *** carcinogenesis,cancer cells acquire dependency of aberrant transcriptional programs(known as“transcription addiction”)to meet the high demands for uncontrolled *** needs for particular transcription programs for cancer growth could be *** dependencies of certain transcription regulators could be exploited for therapeutic *** thyroid cancer(ATC)is an extremely aggressive human cancer for which new treatment modalities are urgently *** resistance to conventional treatments and the lack of therapeutic options for improving survival might have been attributed to extensive genetic heterogeneity due to subsequent evolving genetic alterations and clonal selections during *** this genetic complexity,mounting evidence has revealed a characteristic transcriptional addiction of ATC cells resulting in evolving diverse oncogenic signaling for cancer cell *** transcriptional addiction has presented a huge challenge for effective targeting as shown by the failure of previous targeted ***,an emerging notion is that many different oncogenic signaling pathways activated by multiple upstream driver mutations might ultimately converge on the transcriptional responses,which would provide an opportunity to target transcriptional regulators for treatment of ***,we review the current understanding of how genetic alterations in cancer distorted the transcription program,leading to acquisition of transcriptional *** also highlight recent findings from studies aiming to exploit the opportunity for targeting transcription regulators as potential therapeutics for ATC.

关键词： Transcriptional addiction transcription oncogene addiction cancer stem cell thyroid hormone receptors steroid receptor coactivators BET inhibitor anaplastic thyroid cancer

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Endoscopic management of occluded metal biliary stents:Metal versus 10F plastic stents

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World Journal of Gastroenterology 2010年第42期16卷 5347-5352页

作者： Won Jae Yoon Ji Kon Ryu Jung Won lee Dong-Won Ahn Yong-Tae Kim Yong Bum Yoon Sang Myung woo woo Jin lee Division of Gastroenterology Department of Internal MedicineSeoul National University College of Medicine101 Daehang-roJongno-guSeoul110-744South Korea Center for Liver Cancer National Cancer Center323 Ilsan-roIlsandong-guGoyang-siGyeonggi-do410-769South Korea

AIM:To compare the efficacy of self-expandable metal stents(SEMSs) with 10F plastic stents(PSs) in the endoscopic management of occluded ***:We retrospectively reviewed the medical records of 56 patients who underwent SEMS insertion for palliation of unresectable malignant biliary obstruction between 2000 and 2007 and subsequent endoscopic retrograde biliary drainage(ERBD) with SEMS or PS for initial SEMS occlusion between 2000 and ***:Subsequent ERBD with SEMS was performed in 29 patients and with PS in *** median time to stent occlusion after subsequent ERBD was 186 d in the SEMS group and 101 d in the PS group(P= 0.118).Overall median stent patency was 79 d for the SEMS group and 66 d for the PS group(P = 0.379).The mean number of additional biliary drainage procedures after subsequent ERBD in patients that died(n = 50) during the study period was 2.54 ± 4.12 for the SEMS group and 1.85 ± 1.95 for the PS group(P = 0.457).The mean total cost of additional biliary drainage procedures after the occlusion of subsequent SEMS or PS was $410.04 ± 692.60 for the SEMS group and $630.16 ± 671.63 for the PS group(P = 0.260).Tumor ingrowth as the cause of initial SEMS occlusion was the only factor associated with a shorter time to subsequent stent occlusion(101 d for patients with tumor ingrowth vs 268 d for patients without tumor ingrowth,P = 0.008).CONCLUSION:Subsequent ERBD with PSs offered similar patency and number of additional biliary drainage procedures compared to SEMSs in the management of occluded SEMS.

关键词： Stents Biliary tract neoplasms Obstructive jaundice Endoscopy Endoscopic retrograde cholangiopancreatography

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Over 100-THz bandwidth selective difference frequency generation at LaAlO_(3)/SrTiO_(3) nanojunctions

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Light(Science & Applications) 2019年第1期8卷 968-974页

作者： Lu Chen Erin Sutton Hyungwoo lee Jung-woo lee Jianan Li Chang-Beom Eom Patrick Irvin Jeremy Levy Department of Physics and Astronomy University of PittsburghPittsburghPA 15260USA Pittsburgh Quantum Institute PittsburghPA 15260USA Department of Materials Science and Engineering University of Wisconsin-MadisonMadisonWA 53706USA

The ability to combine continuously tunable narrow-band terahertz(THz)generation that can access both the farinfrared and mid-infrared regimes with nanometer-scale spatial resolution is highly promising for identifying underlying light-matter interactions and realizing selective control of rotational or vibrational resonances in nanoparticles or ***,we report selective difference frequency generation with over 100 THz bandwidth via femtosecond optical pulse *** THz emission is generated at nanoscale junctions at the interface of LaAlO_(3)/SrTiO_(3)(LAO/STO)that is defined by conductive atomic force microscope lithography,with the potential to perform THz spectroscopy on individual nanoparticles or *** simulation of the time-domain signal facilitates the identification of components that contribute to the THz *** ultra-wide-bandwidth tunable nanoscale coherent THz source transforms the LAO/STO interface into a promising platform for integrated lab-on-chip optoelectronic devices with various functionalities.

关键词： tunable lithography selective

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