Metal Halide Semiconductors for Inorganic P-channel Thin-Film Transistors

이다인,김민수,이근형 한국공업화학회 2021 한국공업화학회 연구논문 초록집 Vol.2021 No.0

Free-Living Amoeba Vermamoeba vermiformis Induces Allergic Airway Inflammation

이다인,박성희,강신애,김도현,김선현,송소연,이상은,유학선 대한기생충학ㆍ열대의학회 2022 The Korean Journal of Parasitology Vol.60 No.4

The high percentage of Vermamoeba was found in tap water in Korea. This study investigated whether Vermamoeba induced allergic airway inflammation in mice. We selected 2 free-living amoebas (FLAs) isolated from tap water, which included Korean FLA 5 (KFA5; Vermamoeba vermiformis) and 21 (an homolog of Acanthamoeba lugdunensis KA/E2). We axenically cultured KFA5 and KFA21. We applied approximately 1×106 to mice’s nasal passages 6 times and investigated their pathogenicity. The airway resistance value was significantly increased after KFA5 and KFA21 treatments. The eosinophil recruitment and goblet cell hyperplasia were concomitantly observed in bronchial alveolar lavage (BAL) fluid and lung tissue in mice infected with KFA5 and KFA21. These infections also activated the Th2-related interleukin 25, thymic stromal lymphopoietin, and thymus and activation-regulated chemokines gene expression in mouse lung epithelial cells. The CD4+ interleukin 4+ cell population was increased in the lung, and the secretion of Th2-, Th17-, and Th1-associated cytokines were upregulated during KFA5 and KFA21 infection in the spleen, lung-draining lymph nodes, and BAL fluid. The pathogenicity (allergenicity) of KFA5 and KFA21 might not have drastically changed during the long-term in vitro culture. Our results suggested that Vermamoeba could elicit allergic airway inflammation and may be an airway allergen.

Black Phosphorus Nonvolatile Transistor Memory

이다인,최용석,황의헌,강문성,이승우,조정호 한국고분자학회 2016 한국고분자학회 학술대회 연구논문 초록집 Vol.41 No.1

폐쇄성 수면무호흡증 환자의 과도한 주간졸음의 예측인자

이다인,이호원,강병욱,김준영,김정수,박성파 대한수면연구학회 2008 Journal of sleep medicine Vol.5 No.1

Excessive daytime sleepiness (EDS) is a well-recognized consequence of obstructive sleep apnea. EDS is considered an important health problem leading to impaired concentration, accidents, and poor quality of life. The aim of this study is to evaluate EDS and know the correalation between EDS and polysomnographic findings. 150 patients who visited our sleep clinic for snoring or sleep apnea were studied. Among them, 93 patients were included who had no history of previous diagnosis and treatment of OSA (Obstructive sleep apnea) and whose AHI (Apnea-Hypopnea Index) was more than 5 checked on polysomnography (PSG) had newly diagnosed as OSA. They completed sleep questionnaires and overnight PSG. The association between EDS and other data from PSG and demographic data were further assessed by correalation analysis. There were 93 patients comprising 75(80.1)% males and 18(19.9)% females. Their mean age was 44±1.4years, and co-morbidity index was 0.2±0.5. EDS was demonstrated in 34(36.6%). The EDS correlated poorly with PSG variables, demographic data, and comorbidity. To assess the EDS appropriately, further studies including follow up PSG would be needed.

제로 트러스트 원리를 반영한 보안 강화 요소 기술 적용 방안 연구

이다인,이후기 한국융합보안학회 2022 융합보안 논문지 Vol.22 No.3

갈수록 정교해지는 사이버 위협, 클라우드 도입의 가속, 코로나19 팬데믹으로 인한 원격 및 하이브리드 근무환경 도입 등으로 인하여 많은 기업이 경계 안에 있는 모든 것을 암묵적으로 신뢰하는 전통적인 보안 모델이 경계가 존재하지 않고 데이터와 사용자가 갈수록 탈중앙화되는 오늘날 환경에 적합하지 않다는 사실이 부각되면서 제로 트러스트라(Zero Trust)는 개념이 갈수록 주목받고 있다. 제로 트러스트는 '아무도 신뢰하지 않는다'는 전제의 사이버 보안 모델로, 전체 시스템에서 안전한 영역 또는 이용자는 전무하다는 것을 원칙으로 내부 이용자도 검증을 거치며, 네트워크 접속 환경에 따른 정보 접근 범위도 차등 및 최소화하는 방안이다. 코로나19 팬데믹으로 인하여 재택근무가 일상화되고, 기존 사이버 보안방안이 한계에 부딪히면서 제로 트러스트(Zero Trust) 기술이 한층 더 주목을 받고 있다. 이에 따라 우리 정부도 NIST 표준을 참고로 제로 트러스트 도입 시 국내 공공 및 민간부문의 수용 가능성 현황, 개선이 필요한 과제 등을 점검할 것으로 예상된다. 이 논문에서는 이러한 제로 트러스트와 제로 트러스트의 기본원리, 철학, 고려사항에 대해 설명하고, 제로 트러스트의 기술을 접목시켜 보안을 강화하는 실무적인 기초 방안에 대하여 제시한다.

Identification of Free-Living Amoebas in Tap Water of Buildings with Storage Tanks in Korea

이다인,박성희,백종환,윤지원,진수임,한광언,유학선 대한기생충학ㆍ열대의학회 2020 The Korean Journal of Parasitology Vol.58 No.2

Free-living amoebas (FLAs) can cause severe disease in humans and animals when they become infected. However, there are no accurate survey reports on the prevalence of FLAs in Korea. In this study, we collected 163 tap water samples from buildings, apartments, and restrooms of highway service areas in 7 Korean provinces with high population density. All these buildings and facilities have water storage tanks in common. The survey was separated into categories of buildings, apartments, and highway service areas. Five hundred milliliters of tap water from each building was collected and filtered with 0.2 μm pore filter paper. The filters were incubated in agar plates with heated E. coli at 25°C. After axenization, genomic DNA was collected from each FLA, and species classification was performed using partial 18S-rDNA PCR-sequencing analysis. We found that 12.9% of tap water from buildings with storage tanks in Korea was contaminated with FLAs. The highway service areas had the highest contamination rate at 33.3%. All of the FLAs, except one, were genetically similar to Vermamoeba vermiformis (Hartmannella vermiformis). The remaining FLA (KFA21) was very similar to Acanthamoeba lugdunensis (KA/E26). Although cases of human infection by V. vermiformis are very rare, we must pay attention to the fact that one-third of tap water supplies in highway service areas have been contaminated.

소아 청소년의 비만과 치아우식증의 관계에 대한 논문 고찰

이다인,한지인,서상아,이민지,전다정,황수정,Lee, Dain,Han, Jiin,Seo, Sangah,Lee, Minji,Jeon, Dajeong,Hwang, Soo jeong 대한치과위생학회한국치위생과학회 2021 대한치위생과학회지 Vol.4 No.1

The purpose of the present study was to investigate the relationship between obesity and dental caries in children and adolescents. This study was analyzed by searching the following words in Google Scholar (https://scholar.google.co.kr), Kiss (kiss.kstudy.com), KCI (www.kci.go.kr), and RISS (riss.kr): "pediatric," "juvenile," "obesity," and "dental caries." A total of 19 Korean and 10 foreign studies out of 107 studies were selected after excluding the studies based on the exclusion criteria. When evaluating the relationship between childhood and adolescent obesity and dental caries, 16 out of 29 articles (55.2%) indicated a significant relationship, and 2 (6.9%) indicated different results based on sex, while 13 articles (44.8%) showed no significant relationship between obesity and dental caries. Among the significant studies, a total of 10 (34.5%) showed that the number of dental caries increased according to an increase in obesity, i.e., from normal to overweight to obese. A total of 5 studies (17.2%) reported that the number of dental caries increased in underweight individuals compared to those of normal weight, or decreased according to an increase in obesity, while 1 study (3.4%) indicated that the number of dental caries increased in both the underweight and obese groups compared to the normal weight group. Therefore, studies on the relationship between dental caries and the degree of obesity in children and adolescents have not shown a certain trend.

High-performance perovskite-graphene hybrid photodetector

이다인,이영빈,황의헌,라창호,유원종,안종현,박종혁,조정호 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.1

A high-performance novel photodetector is demonstrated, which consists of graphene and CH3 NH3PbI3 perovskite layers. The resulting hybrid photodetector exhibits a dramatically enhanced photo responsivity (180 A/W) and effective quantum efficiency (5×104%) over a broad bandwidth within the UV and visible ranges.

Coking Test Using Jet A-1 and Desulfurized Kerosene in a Regenerative Cooling Channel Environment

이다인,이강영,한선우,안규복 한국항공우주학회 2022 International Journal of Aeronautical and Space Sc Vol.23 No.3

The walls of a liquid propellant rocket engine generally employ regenerative cooling channels to reduce the enormous heat load generated by the combustion of the fuel and oxidizer. When a hydrocarbon fuel is heated to a high temperature in such an engine, the reaction between the copper in the cooling channel wall and the sulfur in the fuel forms coking material with a high carbon content and low heat transfer coefficient. In this study, a series of coking tests was, therefore, performed using Jet A-1 aviation kerosene and low-sulfur/low-aromatics kerosene in specimens simulating a regenerative cooling channel under various conditions. The coking material remaining inside each specimen was analyzed and photographed using an energy-dispersive X-ray analyzer and a field emission scanning electron microscope. The results were used to determine the relationship between fuel characteristics and coking and its effects on regenerative cooling channel performance.

토픽 모델링을 활용한 코로나19 시기 대학평생교육 현황 분석 -뉴스 빅데이터를 중심으로-

이다인,고장완,박지우 숭실대학교 한국평생교육ㆍHRD연구소 2022 평생교육 · HRD연구 Vol.18 No.2

본 연구의 목적은 뉴스 빅데이터를 활용하여 코로나19 시기의 대학평생교육 현황을 살펴보고 이를 바탕으로 대학평생교육이 나아가야 할 방향에 관한 시사점을 제공하는 것이다. 이를 위해 2020년 2월 1일부터 2022년 2월 1일까지 신문·방송에 보도된 347건의 뉴스를 수집하였으며, 이를 토픽 모델링 기법을 활용하여 키워드 분석을 실시하였다. 본 연구의 결과는 다음과 같다. 첫째, 대학은 코로나19 영향으로 평생교육, 융합교육, 온라인교육을 확대함으로써 미래교육으로 나아가고 있음을 확인하였다. 특히, 대학은 4차 산업혁명이 도래함에 따라 융합교육을 적극 추진하고 있었다. 또한, 코로나19로 평생교육 영역에서도 온라인교육이 크게 증가함에 따라 온라인 수업 관련 기술과 노하우를 축적한 사이버대학이 주목을 받았고 정부는 한국형 온라인 공개강좌(K-MOOC)의 양적·질적 성장을 도모하였다. 둘째, 코로나19 시기 비수도권 대학은 지역사회와의 협력을 강화하였다. 이들은 학령인구 감소와 코로나19로 학생 모집의 어려움을 겪었으며, 지역사회는 심각한 청년 유출 문제를 경험하였다. 이에 비수도권 대학과 지역사회는 평생교육을 통해 코로나19로 인한 위기를 극복하고자 하였다. 마지막으로, 평생직업교육과 정부의 평생교육 지원사업에 관한 토픽도 중요하게 주목받았다. 코로나19와 4차 산업혁명의 영향으로 성인학습자의 직업전환교육, 재취업교육 등에 대한 수요가 증가하였으며, 이에 따라 정부는 대학의 평생교육체제 지원사업(LiFE)을 통해 일·학습 병행 재직자의 평생학습을 장려하고 있었다.