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Kim, Seonyeong,Shin, Somyeong,Kim, Taekwang,Du, Hyewon,Song, Minho,Kim, Ki Soo,Cho, Seungmin,Lee, Sang Wook,Seo, Sunae IOP 2017 Nanotechnology Vol.28 No.17
<P>The modulation of charge carrier concentration allows us to tune the Fermi level (<I>E</I> <SUB>F</SUB>) of graphene thanks to the low electronic density of states near the <I>E</I> <SUB>F</SUB>. The introduced metal oxide thin films as well as the modified transfer process can elaborately maneuver the amounts of charge carrier concentration in graphene. The self-encapsulation provides a solution to overcome the stability issues of metal oxide hole dopants. We have manipulated systematic graphene p-n junction structures for electronic or photonic application-compatible doping methods with current semiconducting process technology. We have demonstrated the anticipated transport properties on the designed heterojunction devices with non-destructive doping methods. This mitigates the device architecture limitation imposed in previously known doping methods. Furthermore, we employed <I>E</I> <SUB>F</SUB>-modulated graphene source/drain (S/D) electrodes in a low dimensional transition metal dichalcogenide field effect transistor (TMDFET). We have succeeded in fulfilling n-type, ambipolar, or p-type field effect transistors (FETs) by moving around only the graphene work function. Besides, the graphene/transition metal dichalcogenide (TMD) junction in either both p- and n-type transistor reveals linear voltage dependence with the enhanced contact resistance. We accomplished the complete conversion of p-/n-channel transistors with S/D tunable electrodes. The <I>E</I> <SUB>F</SUB> modulation using metal oxide facilitates graphene to access state-of-the-art complimentary-metal-oxide-semiconductor (CMOS) technology.</P>
Kim, Sujin,Lee, Seonyeong,Shin, Chorong,Lee, Jangwoo,Kim, Sunmi,Lee, Aram,Park, Jeongim,Kho, Younglim,Moos, Rebecca K.,Koch, Holger M.,Kim, Sungkyoon,Choi, Kyungho Elsevier 2018 International journal of hygiene and environmental Vol.221 No.4
<P><B>Abstract</B></P> <P>Parabens and triclosan have been widely used in many personal care products and cosmetics. The endocrine disrupting potential of these compounds is of increasing public health concern. The aim of this study is to understand the current exposure profile of these chemicals in last void before bedtime (night-time) and first-morning void (first-morning) urines among a Korean population and to characterize their exposure sources and pathways.</P> <P>A total of 261 people, including infants (0–2 years), toddlers (3–6 years), children (7–12 years), adolescents (13–18 years), and adults (≥19 years), were recruited, and sampled for night-time urine and first-morning urine of the following day. Methyl (MeP), ethyl (EtP), propyl (PrP) and butyl paraben (BuP), and triclosan were measured in urine. The demographic characteristics, use of personal care products, and food consumption were obtained through a questionnaire.</P> <P>Among the target compounds, EtP and MeP were most frequently detected at the highest concentrations. The median concentration of EtP in night-time urine was 32.4 μg/L (interquartile range: 8.37–82.8 μg/L), which is higher than previously reported worldwide. Unlike other test compounds, compared to those measured from first-morning urine, the EtP concentrations were significantly higher in night-time urine, suggesting the presence of different exposure sources. Among adults, the MeP and PrP concentrations in night-time urine were associated with frequent use of skin care products, colored cosmetics, bath products, toothpaste, vinyl food packaging, or consumption of canned food. The MeP and PrP concentrations were higher in females than in males, especially in night-time urine. The results of this study also show that multiple urine samples are necessary to capture the diurnal variation of non-occupational exposure to environmental chemicals, such as parabens.</P>
Kim Haeyoon,Yang Seonyeong,Park Jaesel,Kim Byeong Chae,Yu Kyung-Ho,Kang Yeonwook 대한치매학회 2023 Dementia and Neurocognitive Disorders Vol.22 No.2
Background and Purpose: The Montreal Cognitive Assessment (MoCA) has been known as a screening test for detecting mild cognitive impairment (MCI) better than Mini-Mental State Examination (MMSE). However, in previous domestic studies, no significant difference was found in the discriminability between MoCA and MMSE. Researchers have suggested that this might be because older Koreans are less educated than older Westerners. This study was conducted to examine the effect of education on the discriminability of MoCA compared to the MMSE. Methods: Participants were 123 cognitively normal elderly, 118 with vascular MCI, 108 with amnestic MCI, 121 with vascular dementia, and 113 with dementia of the Alzheimer’s type. The Korean-MoCA (K-MoCA) and Korean-MMSE (K-MMSE) were administered. Multiple regression analyses and receiver operating characteristic (ROC) curve analyses were performed. Results: In all participants, education significantly affected both K-MoCA and K-MMSE scores along with age. The effect of education was re-examined by subgroup analysis after dividing subjects according to the level of education. Effect of education on K-MoCA and K-MMSE was only shown in the group with <9 years of education. ROC curve analyses revealed that the discriminability of K-MoCA to differentiate between vascular MCI and normal elderly was significantly higher than that of K-MMSE. When re-examining subgroups divided by education level, however, this higher discriminability of K-MoCA disappeared in the group with <9 years of education. Conclusions: These results indicate no difference in discriminating cognitive deficits between K-MoCA and K-MMSE in Korean elderly with <9 years of education.
Seonyeong Kim,Daesik Kim 한국추진공학회 2020 Journal of Propulsion and Energy Vol.1 No.1
We have developed a 1D thermoacoustic network model based on a transfer function approach for predicting combustion instabilities in a multi-duct system. Two different functions are presented for the numerical model. The acoustic transfer function represents the acoustic characteristics and is defined as the ratio of the velocity perturbation to the heat release perturbation. The flame transfer function represents the flame dynamics. The closed-loop feedback instability is analyzed combining these two transfer functions. The numerical approach is successfully validated through comparison of the experimentally obtained instability results in a laboratory scale premixed swirl combustor with well-defined experimental data.