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Generation of Charged SiC Nanoparticles During HWCVD Process
Daseul Kim,Du Yun Kim,Ji Hye Kwon,Kun‑Su Kim,Nong‑Moon Hwang 대한금속·재료학회 2020 ELECTRONIC MATERIALS LETTERS Vol.16 No.5
Charged nanoparticles have been shown to be spontaneously generated in the gas phase in various chemical vapor deposition(CVD). Furthermore, it has been shown that these charged nanoparticles can contribute to the growth of thin films,nanowires, nanotetrapods and so on. Here, the generation of charged silicon carbide (SiC) nanoparticles in the gas phaseduring a hot wire CVD process was studied by capturing nanoparticles with a different delay time on a silicon monoxidemembrane of the copper mesh grid for transmission electron microscope. The average size of SiC nanoparticles capturedfor 30 s increased from 2.9 to 6.1 nm with increasing delay time from 0 to 60 min. The deposition behavior of SiC filmswas affected by the applied bias on a substrate holder. A homo-epitaxial SiC film as thick as ~ 200 nm was grown under thesubstrate bias of − 200 V, whereas polycrystalline SiC films were grown under 0 V and + 15 V. It indicates that nanoparticlesgenerated in the gas phase should be charged.
Daseul Ham,Mathias Jaschhof,배연재 한국동물분류학회 2020 Animal Systematics, Evolution and Diversity Vol.36 No.1
Cecidomyiidae (Diptera) consists of six subfamilies, which are divided into three groups according to larval ecological habits (phytophagous, mycophagous, and zoophagous). The five basal subfamilies of Cecidomyiidae consist entirely of mycophagous species, with approximately 1500 species described worldwide and 29 previously known to occur in Korea. In this study, 37 named species (1 Lestremiinae, 29 Micromyinae, 4 Winnertziinae, and 3 Porricondylinae species) are newly reported from South Korea. We excluded Lestremia yasukunii Shinji from the list of Korean mycophagous cecidomyiids as it is a nomen nudum. Therefore, we herein officially recognize 65 species, 30 genera, and four subfamilies for the Korean mycophagous cecidomyiid fauna. We also provide diagnoses and photographs to aid species identification and discussion on the four years of gall midge taxonomic inventory in South Korea.
Daseul Lee,Seongho Ahn,Chang-Muk Lee 한국식품영양과학회 2021 한국식품영양과학회 학술대회발표집 Vol.2021 No.10
Recent global climate change is producing an enormous demand for alternative edible protein sources from plants, insects, and microorganisms. To find out affordable microbial proteins, we examined the nutritional composition of fungus, Rhizopus oryzae, as an alternative mycoprotein. R. oryzae is a starter of "Tempeh", food for many people around the world. Using freeze-dried culture samples, we analyzed nutrients and amino acid compositions from 4 strains of R. oryzae (KACC No. 40228, 40533, 40534, and 40536). All strains contained crude protein contents between 30-40%, carbohydrate contents of 40-50%, and fat contents of 10-20%. Among them, R. oryzae KACC 40536 showed the highest protein content (41.08%) and the lowest fat content (8.72%). Further amono acid analysis of R. oryzae KACC 40536 showed that the amounts of its essential amino acids, including valine, lysine, isoleucine, tryptophan and threonine met recommendable daily-intake standards set by FAO/WHO. Our results show that R. oryzae KACC 40536 may provide a putative alternative mycoprotein.
A Mirrored Current-conveyor Transimpedance Amplifier in 65-nm CMOS
Daseul Yoon,Ji-Eun Joo,Sung Min Park 대한전자공학회 2020 Journal of semiconductor technology and science Vol.20 No.6
This paper presents a current-mode transimpedance amplifier (TIA) implemented in a 65- ㎚ CMOS technology, in which the mirrored current-conveyor (MCC) input configuration is proposed to lower the input impedance for wide bandwidth, thereby enabling narrow pulse recovery. Also, a feedforward control-voltage generator is suggested to realize automatic gain-control within a single pulse. Post-layout simulations of the proposed MCC-TIA demonstrate the variable transimpedance gain of 58~77 ㏈Ω, a wide dynamic-range of 41.9 ㏈ that accommodates the input currents from 18 ㎂pp to 2.24 ㎃pp, the minimum noise current spectral density of 16.8 ㎀/sqrt(Hz), the power dissipation of 40 ㎽, and the core area of 1.0 ㎟.
( Daseul Hwang ),( Hyung Won Ryu ),( Ji-won Park ),( Jung-hee Kim ),( Doo-young Kim ),( Jae-hoon Oh ),( Ok-kyoung Kwon ),( Sang-bae Han ),( Kyung-seop Ahn ) 한국미생물 · 생명공학회 2022 Journal of microbiology and biotechnology Vol.32 No.1
Peucedanum japonicum Thunberg (PJT) has been used in traditional medicine to treat colds, coughs, fevers, and other inflammatory diseases. The goal of this study was to investigate whether 3′-isovaleryl-4′-senecioylkhellactone (IVSK) from PJT has anti-inflammatory effects on lung epithelial cells. The anti-inflammatory effects of IVSK were evaluated using phorbol 12-myristate 13-acetate (PMA)-stimulated A549 cells and regular human lung epithelial cells as a reference. IVSK reduced the secretion of the inflammatory mediators interleukin (IL)-8 and monocyte chemoattractant protein-1 (MCP-1), and the mRNA expression of IL-6, IL-8, MCP-1, and IL-1β. Additionally, it inhibited the phosphorylation of IκB kinase (IKK), p65, Iκ-Bα, and mitogen-activated protein kinases (MAPKs) p38, JNK, and ERK in A549 cells stimulated with PMA. Moreover, the binding affinity of activator protein-1 (AP-1) and nuclear factor-κB (NF-κB) was significantly reduced in the luciferase assay, while nuclear translocation was markedly inhibited by IVSK in the immunocytochemistry. These findings indicate that IVSK can protect against inflammation through the AP-1 and NF-κB pathway and could possibly be used as a lead compound for the treatment of inflammatory lung diseases.
대학생 비폭음 음주 집단과 비음주 집단의 기질 및 성격 특성 비교
이다슬 ( Daseul Lee ) 사단법인 아시아문화학술원 2021 인문사회 21 Vol.12 No.6
본 연구는 대학생을 대상으로 폭음 수준에 미치지 않는 음주 집단과 비음주 집단의 기질 및 성격 특성의 차이를 비교하고자 하였다. 이를 위해 서울 소재 S 대학교 재학생을 대상으로 자기보고 자료를 수집하여 음주 빈도와 음주량을 기준으로 25명의 비폭음 음주 집단과 28명의 비음주 집단으로 나누고 이들의 기질 및 성격 척도(TCI)의 척도 점수를 비교하였다. 그 결과 첫째, 기질 차원에서 두 집단 간 자극추구(NS)의 차이는 유의하지 않았고 위험회피(HA)는 비폭음 음주 집단에서 비음주 집단보다 더 낮은 것으로 나타났다. 둘째, 성격 차원에서 비폭음 음주 집단의 자율성(SD)이 비음주 집단보다 더 높은 것으로 나타났다. 본 연구는 음주행위의 유형에 따른 대학생의 성격 특성에 대한 이해를 넓히고자 하였으며, 이러한 결과를 바탕으로 향후 연구의 방향을 제시하였다. The purpose of this study was to compare the differences in temperament and character dimensions of the drinking group that do not meet the level of binge drinking and the non-drinking group in college students. Self-report data were collected from S University students in Seoul, divided into 25 non-binge drinking group and 28 non-drinking group based on drinking frequency and amount of alcohol and then compared the Temperament and Character Inventory (TCI) scales. As a result, first, in terms of temperament, the difference in novelty seeking (NS) between the two groups was not significant, and harm avoidance (HA) was found to be lower in the non-binge drinking group than in the non-drinking group. Second, in terms of personality, it was found that self-directedness (SD) of the non-binge drinking was higher than that of the non-drinking group. This study attempted to broaden the understanding of the personality characteristics of college students according to the type of drinking behavior, and based on these results, the directions for future research were presented.