γ - Alumina 의 합성조건이 그 물성에 미치는 영향

백은주(Eun Joo Baek),남영우(Young Woo Nam) 한국화학공학회 1993 춘계학술발표논문집 Vol.- No.-

일차성 호중구성 반흔성 탈모의 임상 및 조직학적 소견에 대한 비교 연구

백은주 ( Eun Joo Baek ),형진혁 ( Jin Hyeok Hyeong ),박은주 ( Eun Joo Park ),김광중 ( Kwang Joong Kim ),김광호 ( Kwang Ho Kim ) 대한피부과학회 2022 대한피부과학회지 Vol.60 No.3

Background: Folliculitis decalvans and dissecting cellulitis are types of primary neutrophilic cicatricial alopecia characterized by permanent hair loss. Clinicopathological differentiation is poorly described in literature. Objective: This study aimed to determine the clinicopathological distinction between folliculitis decalvans and dissecting cellulitis. Methods: A retrospective review was conducted in 45 patients diagnosed with dissecting cellulitis and folliculitis decalvans between 2011 and 2021. We reviewed the clinical features using electronic medical records, clinical photographs, and histopathologic features. Results: Clinically, middle-aged men with folliculitis decalvans showed polytrichia (80%) and papulopustules (55%), while young men with dissecting cellulitis had deeply seated nodules (84%). Histopathologically, follicular plugging was more frequently observed in dissecting cellulitis (80%) than in folliculitis decalvans (50%). There was a difference in the depth of inflammation between the two types. Conclusion: A difference in clinical manifestations was observed according to the depth of inflammation. These findings may contribute to the differential diagnosis of primary neutrophilic cicatricial alopecia. (Korean J Dermatol 2022;60(3):167∼172)

퀘쳐스 전처리와 질량분석기를 이용한 유기농 자재 중 259 성분 농약 다성분 분석법 검증

백은주 ( Eun Joo Baek ),박혜진 ( Hyejin Park ),임채욱 ( Chaiuk Lim ),유혜림 ( Hyerim Yu ),이한솔 ( Han Sol Lee ),박소희 ( Sohee Park ),신병곤 ( Byeunggon Shin ),이성훈 ( Seong Hun Lee ),홍성희 ( Sung-hee Hong ) 한국환경농학회 2023 한국환경농학회 학술발표논문집 Vol.2023 No.0

Organic farming materials are used to preserve the environment and grow agricultural products organically. In Korea, organic synthetic pesticides must not be detected in organic farming materials for soil amendments and biopesticides. So, proper management of the organic farming materials must be preceded. It is necessary to establish an analytical method to accurately and reliably analyze residual pesticides in organic farming materials with various properties such as extracts, oil, and so on. In this study, a QuEChERS method for simultaneous determination of 259 pesticide residues organic farming materials was validated. Organic farming material samples were extracted with acetonitrile and QuEChERS EN buffer.. And then targeted pesticides were purified with the dispersive solid phase extraction(d-SPE, PSA) and detected by gas chromatography-tandem mass spectrometry (GC-MS/MS). To evaluate performance of the method, validation experiments were carried out on five types of organic farming material at three spiking levels (0.05, 0.25, 0.5 mg kg^-1). The recoveries of the organic farming materials ranged between 70 and 120.0% with associated relative standard deviations (RSD) less than 22% for most pesticides. The limit of quantification (LOQ) of methods were below 0.05 mg/kg^-1, and the coefficient of determination (R²) of matrix-matched standards were > 0.98. In order for the developed method to be certified as an analytical method determined by the head of NAQs, cross-validation of the three labs is in progress.

알루미늄 알콕사이드 전구체로부터 합성된 감마 알루미나의 합성조건이 그 물성에 미치는 영향

백은주,남영우 ( Eun Joo Baek,Young Woo Nam ) 한국화학공학회 1994 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.32 No.3

Al-alkoxides were prepared and hydrolyzed by sol-gel method to get Al-hydroxides. Al-hydroxides were calcined to form γ-alumina. The effects of alkyl groups of Al-alkoxide prepared from different alcohols on the properties of γ-alumina were observed. The effect of hydrolysis conditions on the specific surface area and pore volume of γ-alumina were examined with varing the contents of benzene, water and HCl.

자생 및 약용 식물의 Streptococcus mutans항균 활성의 검색

김건우,백정규,장영욱,금은주,권윤숙,김홍주,손호용,Kim Kun-Woo,Baek Jueng-Kuy,tang Young-Wook,Kum Eun-Joo,Kwon Yun-Suk,Kim Hong-Ju,Sohn Ho-Yong 한국생명과학회 2005 생명과학회지 Vol.15 No.5

Oral streptococci are major constituents of dental plaques, and their prevalence is closely linked with various pathologic symptoms, such as dental caries. To develop natural anticaries agent, we prepared 309 kinds of plant extracts from 215 species of edible or medical plants, and antibacterial activity of the extracts against Streptococcus mutans JC-2 were evaluated based on 96 well microtiter plate assay and disk paper method, subsequently. Among the tested plant extracts, Ailanthus altissima, Paeonia lactiflora, Rubus phoenicolasius, Aralia continentalis, Quercus acutissima, Persicaria hydropiper and Agrimonia pilosa extracts showed strong antimicrobial activity. Determination of minimal inhibitory concentration (MIC) of the selected seven plant extracts showed that Ailanthus altissima, Persicaria hydropiper and Quercus acutissima extracts ($MIC=25\∼30[\mu}g/ml$) has potential as a source of natural anticaries agents.

수지점액낭종 환자에서 유형 및 치료 반응에 대한 후향적 연구

정준우 ( Joon Woo Jung ),홍은혜 ( Eun Hye Hong ),백은주 ( Eun Joo Baek ),박은주 ( Eun Joo Park ),김광중 ( Kwang Joong Kim ),김광호 ( Kwang Ho Kim ) 대한피부과학회 2021 대한피부과학회지 Vol.59 No.10

Background: Digital mucous cysts (DMCs) are benign, occurring mainly on the fingers but rarely on the toes. Although the exact cause of DMC has not been identified, it is classified into two different types based on its pathogenesis and location. Surgical and nonsurgical procedures, including aspiration, sclerotherapy, steroid injection, cryotherapy, and CO2 laser, can be used to treat DMC. Objective: This study aimed to compare treatment response based on DMC type and evaluate its efficacy in surgical and nonsurgical (sclerotherapy) treatments. Methods: We retrospectively reviewed the electronic medical records of patients with DMC who visited our dermatology department between January 2010 and November 2020. Results: This study enrolled 39 patients having a mean age of 59.2 years. The proportion of female patients (21/39, 53.8%) was more than male (18/39, 46.2%). The DMC occurrence was more frequent in the fingers (32/39, 82.1%), especially in the index and middle fingers than in the toes (7/39, 17.9%). In sclerotherapy, DMC in the distal interphalangeal joint (DIPJ) required more treatment than that in the proximal nail fold (PNF) (p<0.05). The number of treatments using sclerotherapy was higher compared to that of surgical treatments (p<0.05). Conclusion: The DIPJ type of DMC patients was more difficult to treat using sclerotherapy than the PNF type. Moreover, surgical treatment has a better response than sclerotherapy. (Korean J Dermatol 2021;59(10):742∼748)

교실수업 상황에서 학생 창의성을 촉진하는 교수·학습 특성 탐색

조연순(Cho, Younsoon),정혜영(Chung, Hye Young),백은주(Baek, Eun Joo),최규리(Choi, Kyoulee),임현화(Lim, Hyunhwa) 한국교육방법학회 2011 교육방법연구 Vol.23 No.3

The purpose of the study was to explore the characteristics of teaching-learning processes that creativity emerges and find the implications for the teaching-learning methods to promote students' creativity in regular instructions at schools. To fulfill the research purpose, the qualitative case study method has implemented; observation of social studies and science instructions of the 14 classrooms including lower, middle, and higher grades in three elementary schools. The research findings were as follows. First, the characteristics of teaching-learning processes were differed in the beginning, development, and concluding stages. In the beginning stage, the teachers provided students various familiar materials to find the theme of the lesson rather than providing it directly. In the development stage, the teachers tried to let the students explore the concepts (knowledge) and internalize it. Then in the concluding stage, the teachers provided new situations which the students could apply (externalize) the internalized knowledge. The common factors found in all of the three stages were; 1) providing the contexts of authentic situations, 2) keeping the students' curiosity and interests, 3) promoting students to discover new knowledge, and 4) facilitating critical and divergent thinking. Also in all of the three processes, questions raised by teacher were critical to nurture creativity. These factors found in the study should be considered if the teachers want to facilitate students' creativity in regular subject matter teaching.

학생들의 창의성이 발현되는 수업 맥락에서의 상호작용 특성

조연순 ( Youn Soon Cho ),정혜영 ( Hye Young Chung ),최규리 ( Kyou Lee Choi ),백은주 ( Eun Joo Baek ),정지은 ( Ji Eun Jeong ) 한국초등교육학회 2011 초등교육연구 Vol.24 No.4

The purpose of the study was to explore the characteristics of teacher-students` interactions in the teaching and learning contexts where creativity emerges. For the research, 3 elementary schools were selected, and the 14 classes of the recommended 13 teachers of the sites were observed and analyzed with the use of the qualitative research methods. The findings were as follows: First, the most frequently observed interaction which creativity emerges in the teaching and learning processes was teacher`s open-ended question and student`s response followed by the teacher`s sustained feedback. And the interaction could be categorized as two types: teacher-initiated and student-initiated. In the teacher-initiated interaction, teachers promoted students` divergent thinking and facilitated students` progressive understanding through teacher-guided questions and students` responses. In the student-initiated interaction, students experienced critical thinking processes through group discussion with classmates, and created collaborative products and/ or outputs while having active communication in groups. The study suggested that the understanding of how both types of the interactions could facilitate students` creativity was required prior to apply special programs, methods or techniques in school classrooms.

퀘쳐스 전처리와 질량분석기를 이용한 유기농업자재 중 LC 대상 270 성분 농약 다성분 분석법 검증

박소희 ( Sohee Park ),박혜진 ( Hyejin Park ),임채욱 ( Chaiuk Lim ),유혜림 ( Hyerim Yu ),이한솔 ( Han Sol Lee ),백은주 ( Eun Joo Baek ),신병곤 ( Byeunggon Shin ),이성훈 ( Seong Hun Lee ),홍성희 ( Sung-hee Hong ) 한국환경농학회 2023 한국환경농학회 학술발표논문집 Vol.2023 No.0

Organic synthetic pesticides must not be detected in organic farming materials, so proper management must be preceded. This study was conducted to accurately and quickly analyze pesticide residues in organic farming materials. The simultaneous determination of 270 pesticides in organic farming materials was validated using the QuEChERS extraction and liquid chromatography-tandem mass spectrometry (LC-MS/MS). Organic farming materials with various properties such as co-extracts, oils were extracted with acetonitrile and QuEChERS EN buffer. And then, the organic farming materials were purified with the dispersive solid phase extraction (d-SPE, PSA) and detected by LC-MS/MS. To evaluate the validity of the method, recovery tests were performed on five types of organic farming materials at three spiking levels (0.05, 0.25, 0.5 mg/kg^-1). The recoveries ranged between 70% and 120% with associated relative standard deviations(RSD) less than 22%. The limit of quantification (LOQ) of methods were below 0.05 mg/kg^-1, and the coefficient of determination (R2) was more than 0.98 at matrix-matched calibration curves. Most of the compounds met the criteria. In order for the developed method to be certified as an analytical method determined by the head of NAQs, cross-validation of the three labs is in progress.

여대생의 결혼관에 관한 연구

강신미,김욱련,김이화,김현주,백은주 효성여자대학교 가정대학 학도호국단 1985 家政大論集 Vol.4 No.-

In these days, Korea has undergone various changes in every social aspect throughthe process of modernization. Especially in instituional and actual aspects, the family.and marriage have been changed greatly by the rapid urbanization and iudustrializatton,.and these changes have been investigated scientifically. This paper presents marital consciousness and actual behavior of 300 woman collegestudents in Daegu, and was surveyed comparing various parts-the humanities, natural·science and the arts. As for the basic attitude of marriage, they were positive in the need of marriage,,defined marriage as the second starting point of life. Also they put the aim of marriage,on mental value. As for the dating and purity before marriage, 84 percent of respondents assented tothe dating before marriage. And they thought it proper that the duration of datingwas one year to two years. The age of the first dating and the standard of sex moralstore significant. The part of the arts tended to be open, and the part of natural sciencewere conservative. As for the standard of spouse's choice, 84 percent of respondents wanted to have theright of priority they could choose their spouses for themselves. And they thought it·proper that the age of marriage was 25-year-old to 26-year-old, and the gap of maritalage was one year to three years. Ideal spouse's characteristic, home surroundings, and marital harmony were significant. Among various marital conditions, personality tended to to emphasized, and theatmosphere of family and masculine appearance were taken serious. As for a. spouses's job, professor or research occupation was popular. Compared withthe part of the arts, the part of the humanities and natural science were positive inpredicting marital harmony. Among various marital conditions, an only son, the eldest son, and an offspring ofa concubine tended to be evaded. The type of an ideal spouse was companionship.