Adsorption and removal of anionic surfactant amino-functionalized mesoporous silica nanoparticles embedded with TiO₂

윤여주,조선영,이택승 한국공업화학회 2018 한국공업화학회 연구논문 초록집 Vol.2018 No.0

The problem of elimination of surfactant in a radioactive waste liquid generated in a nuclear power plant, has been attracted. Methods for decomposition and removal of environmental pollutants using photocatalytic photo-oxidation methods have been studied in recent years. The photocatalysts such as TiO₂, ZnO, CdS absorb light and generate superoxide anions and hydroxyl radicals, which have strong oxidizing power. These substances oxidize and decompose organic materials. In general, mesoporous silica nanoparticles (MSN) have a wide specific surface area and adsorb various substances. We introduced TiO₂ into MSN to adsorb anionic surfactant and finally treated with APTES ((3-aminopropyl) triethoxysilane). The anion surfactant was adsorbed to the AFMT (amino-functional MSNs_TiO₂) by the electrostatic force between the cation charge of AFMT and the anion surfactant, at the same time the adsorbed anionic surfactant was decomposed through oxidation reaction of TiO₂.

치매 진행 정도에 따른 조기발현과 지연발현 알츠하이머병 환자의 행동심리증상 비교

윤여주,김은주,홍창희 대한치매학회 2014 Dementia and Neurocognitive Disorders Vol.13 No.4

The aim of this study was to investigate behavioral and psychological symptoms of dementia (BPSD) measured by caregiver-administered neuropsychiatric inventory (CGA-NPI) as a function of dementia severity in early onset (EOAD) versus late onset Alzheimer’s disease (LOAD). A total of 113 patients with AD consisting of 49 patients with EOAD and 64 patients with LOAD were enrolled consecutively. General cognitive function and severity of dementia were assessed by the Korean version of mini-mental status examination and clinical dementia rating (CDR), respectively. In the mild stage (CDR 0.5-1), LOAD patients had a significantly higher total CGA-NPI score than EOAD patients. Subgroup analysis demonstrated that disinhibition and night-time behavior were more common and severe in the LOAD group than the EOAD group. However, in the moderate to severe stage (CDR 2-3), EOAD patients had a significantly higher total CGA-NPI score with higher subscores in hallucination, agitation/aggression, irritability/lability, aberrant motor behavior, and appetite/eating change. This study suggested that the heterogeneity of BPSD in AD might be accounted for by dementia severity as well as age at symptoms onset.

Formation of Liquid Marbles Based on Azobenzene-incorporated Metal-Organic Frameworks

윤여주,장근석,김종호,이택승 한국고분자학회 2017 한국고분자학회 학술대회 연구논문 초록집 Vol.42 No.1

시각화가 초등기하문제해결에 미치는 영향

윤여주,강신포,김성준,Yun, Yea-Joo,Kang, Sin-Po,Kim, Sung-Joon 한국학교수학회 2010 韓國學校數學會論文集 Vol.13 No.4

In the elementary mathematics, geometric education emphasize spatial sense and understandings of figures through development of intuitions in space. Especially space visualization is one of the factors which try conclusion with geometric problem solving. But studies about space visualization are limited to middle school geometric education, studies in elementary level haven't been done until now. Namely, discussions about elementary students' space visualization process and methods in plane or space figures is deficient in relation to geometric problem solving. This paper examines these aspects, especially in relation to plane and space problem solving in elementary levels. First, we investigate visualization methods for plane problem solving and space problem solving respectively, and analyse in diagram form how progress understanding of figures and visualization process. Next, we derive constituent factor on visualization process, and make a check errors which represented by difficulties in visualization process. Through these analysis, this paper aims at deriving an influence of visualization on geometric problem solving in the elementary mathematics. 초등수학에서 기하교육은 공간에 대한 직관의 계발을 통해 도형에 대한 이해와 공간 감각을 이끌어내는데 초점을 맞추어야 한다. 이와 함께 시각화는 기하에서의 문제해결 을 결정짓는 중요한 요소 가운데 하나이다. 지금까지 시각화에 대한 분석은 주로 중등 기하교육에서 다루어진 반면, 초등수학에서 평면도형과 공간도형에서의 문제해결과 관련해서 학생들의 시각화에 대한 논의는 부족했다. 본 연구는 초등수학에서 시각화가 기하문제해결에 미치는 영향을 분석한 것으로, 기하문제해결에서 나타나는 시각화 방법과 시각화에 영향을 미치는 요소, 그리고 이 과정에서 나타나는 어려움을 살펴본 것이다. 먼저 평면도형과 입체도형의 문제해결에서 시각화 방법을 구분하여 살펴보고, 이러한 방법에 따라 도형에 대한 이해와 시각화 과정이 어떻게 진행되는지를 도식화하여 살펴본다. 또한 시각화에 영향을 미치는 요소를 구분하고, 시각화 과정의 어려움으로 인해 어떤 오류가 나타나는가를 살펴보고, 이를 통해 초등기하문제해결에서 시각화에 대한 논의를 이끌어낸다.

광이성질화 현상을 갖는 아조벤젠 리간드와 이를 사용한 금속-유기구조체 제조

윤여주,장근석,이택승,Yoon, Yeoju,Jang, Geunseok,Lee, Taek Seung 한국섬유공학회 2017 한국섬유공학회지 Vol.54 No.1

Metal-organic frameworks (MOFs) were prepared by a reaction of 4,4'-(diazene-1,2-diyl)dibenzoic acid (AzDC) as organic ligand and metal ions including zinc, iron (III), copper, and cobalt ions, respectively. Because the synthesized AzDC contained azobenzene and carboxylic acids groups at each ends, it showed trans-to-cis photoisomerization upon UV irradiation and interaction with metal ions, respectively. The AzDC showed more efficient photoisomerization upon exposure to UV light (365 nm), rather than UV light at 254 nm, mainly due to the larger absorption around 365 nm than 254 nm. The isomerization of cis-to-trans azobenzene was observed under ambient light. The resultant MOFs containing AzDC ligand showed photo-triggered conversion of trans- to cis-azobenzene after exposure to UV light. Thus, the porous structure and photo-induced dimensional deformation of the MOFs enable to use in chemical sensing, gas separation, gas storage, catalysis, and drug delivery.

Synthesis of Azonaphthol-based Conjugated Polymer as a Ratiometric Chemosensor for Fluoride Ion

윤여주,조선영,이택승 한국고분자학회 2018 한국고분자학회 학술대회 연구논문 초록집 Vol.43 No.2

청소년의 고통 감내력과 우울 및 행복의 관계에서 사회적 지지의 조절효과

윤여주,김지영 한국청소년학회 2020 청소년학연구 Vol.27 No.6

The purpose of this study was to identify the influence of adolescents' distress tolerance on depression and happiness, and to examine the moderating effect of social support on these relationships. Distress Tolerance Scale, Center for Epidemiological Studies-Depression Scale, Subjective Happiness Scale, and Social Support Scale were conducted to adolescents, and 327 data were analyzed. Correlational analysis indicated that adolescents with high distress tolerance or social support showed the low level of depression and the high level of happiness. Hierarchical multiple regression analysis showed that the moderating effect of social support on the relationship between distress tolerance and depression was significant. The results of this study are significant in that they demonstrated the influence of distress tolerance and social support on adolescents’ mental health and imply that adolescents’ social support can decrease or prevent depression from low distress tolerance. 이 연구에서는 청소년의 고통 감내력이 우울과 행복에 미치는 영향을 확인하고, 이들의 관계에서 사회적 지지가 미치는 조절효과를 검증하고자 하였다. 이를 위해 중, 고등학생을 대상으로 고통 감내력 척도, 우울 척도, 주관적 행복 척도, 사회적 지지 척도를 실시하였으며, 총 327명의 자료를 분석에 사용하였다. 상관분석 결과, 고통 감내력 또는 사회적 지지가 높은 청소년은 우울 수준이 낮고 행복 수준이 높은 것으로 나타났다. 위계적 회귀분석을 사용해서 고통 감내력과 우울 및 행복의 관계에서 사회적 지지의 조절효과를 검증한 결과, 사회적 지지는 고통 감내력이 우울에 미치는 영향을 조절하는 것으로 나타났다. 이 연구의 결과는 청소년의 고통 감내력과 사회적 지지가 정신건강에 미치는 중요한 영향을 입증했다는 점에서 의의가 있으며, 사회적 지지가 고통 감내력에 따른 우울을 감소 또는 예방할 수 있는 가능성을 시사해준다.

초등수학 기하문제해결에서의 시각화 과정 분석

윤여주,김성준,Yun, Yea-Joo,Kim, Sung-Joon 영남수학회 2010 East Asian mathematical journal Vol.26 No.4

Geometric education emphasize reasoning ability and spatial sense through development of logical thinking and intuitions in space. Researches about space understanding go along with investigations of space perception ability which is composed of space relationship, space visualization, space direction etc. Especially space visualization is one of the factors which try conclusion with geometric problem solving. But studies about space visualization are limited to middle school geometric education, studies in elementary level haven't been done until now. Namely, discussions about elementary students' space visualization process and ability in plane or space figures is deficient in relation to geometric problem solving. This paper examines these aspects, especially in relation to plane and space problem solving in elementary levels. Firstly we propose the analysis frame to investigate a visualization process for plane problem solving and a visualization ability for space problem solving. Nextly we select 13 elementary students, and observe closely how a visualization process is progress and how a visualization ability is played role in geometric problem solving. Together with these analyses, we propose concrete examples of visualization ability which make a road to geometric problem solving. Through these analysis, this paper aims at deriving various discussions about visualization in geometric problem solving of the elementary mathematics.

행위주체로서의 유아 교구와 성역할 담론 간의 내부작용 탐구

윤여주 ( Yoon¸ Yeojoo ) 한국영유아교육보육학회 2020 영유아교육.보육연구 Vol.13 No.1

본 연구는 유아교육에서 전통적으로 강조되어온 교구와 환경의 중요성에 대한 인간중심적 관점을 비판적으로 성찰하기 위하여, 유아 교실의 옷 입히기 교구, 유아들, 성역할 담론 간의 관계성을 Karan Barad (2007)의 내부작용 (Intra-action) 이론을 통하여 탐구하였다. 본 연구의 자료는 미국의 한 대학부설 유치원에서 실시된 유아교실의 물질성에 관한 민족지학적 연구의 자료 일부를 발췌하였다. 내부작용 이론은 인간과 비인간인 모든 주체가 행위주체성과 능동성을 가진다고 보고, 이 주체들 간의 관계성에 시선을 맞추고 세계를 바라본다. 이에 따라 본 연구 역시 인간과 물질의 이분법적인 분류 및 위계적 분석에서 벗어나 물질, 즉 교구가 가지는 역동성과 교구를 둘러싼 교실 내외의 담론, 유아들, 교사, 시간, 공간 간의 내부작용에 초점을 맞추어 자료를 분석하였다. 본 연구를 통하여 유아 교실 안에서 특정 발달적 목적을 가지고 유아들이 그것을 발견하여 배워주기를 기다리는 수동적인 물질로 여겨졌던 교구들이, 물질, 담론, 인간 간의 내부작용을 통하여 또 다른 내부작용을 만들어내며, 불확정성과 비결정성을 지닌 현상들을 발현하는 주체가 됨을 발견하였다. 또한 이 내부작용들은 끊임없이 변화되고, 이탈하고, 변형되며 유아의 놀이에 관여하고 있음을 알 수 있었다. In this study, I draw upon Karan Barad’s (2007) theory of intra-action to understand the entangled relationship among Dress-up Dolls, children, and gender discourse and to re-examine the traditional meaning of materials in early childhood classrooms. The data on play incidents with Dress-up Dolls is excerpted from ethnographic study for materiality in early childhood classrooms. The notion of intra-action rejects the hierarchical and categorical binary of human and non-human, but focuses rather on materials as active participants and performative agents. Based on this idea, in this study, the complex and dynamic intra-active process around the toy, children, stereotypically gender discourses, anti-gender-bias discourses in the classroom, time, and space are analyzed. Although the counter-heteronormative gender discourses worked as a norm in the classroom, all the matters including Dress-up Dolls, the discourses, children, teachers, and space and time were engaged in the children’s play in a different way. The play was shifted, transformed, and transgressed. This allows us to understand that toys in early childhood classroom are not passive recipients of educational meanings that human provides, but instead, they involve in producing new possibilities of phenomena in the classroom.

뷰티전공 대학생의 한국형아유르베다 심리유형에 따른 우울 및 스트레스 관계 연구

이여주,윤천성 인문사회 21 2018 인문사회 21 Vol.9 No.6

This study is a psychological type test of Korean Ayurveda and aims to analyze depression and stress for Beauty College Student. We used the SPSS WIN 21.0 program for 190 questionnaires. Korea Ayurveda psychoanalysis on depression showed that people were friendship, leadership and management and stress was followed by friendship, management and leadership. Through this study, it will be basic data for understanding psychological patterns of Beauty College Student and for use in counseling and education field. 본 연구는 한국형아유르베다 심리유형검사로 뷰티전공 대학생을 대상으로 우울 및 스트레스를 분석하는 데 목적이 있다. 회수 설문지 190부를 SPSS WIN 21.0 프로그램을 사용하였고, 우울에 대한 한국형아유르베다 심리유형 분석 결과 친교형, 통솔형, 관리형순으로 나타났으며, 스트레스는 친교형, 관리형, 통솔형 순으로 나타났다. 본 연구를 통해 뷰티전공대학생의 심리유형을 이해하고, 상담 및 교육 현장에서 활용하는 기초자료가 될 것이다.