DEA 용액에서 암모니아를 함유한 염화니켈 수용액으로부터 니켈 분말의 입경 제어

최은영,이윤복,윤석영,김광호,김진천,임영목,김형국,김양도,Choi Eun Young,Lee Yoon Bok,Yoon Suk Young,Kim Kwang Ho,Kim Jin Chun,Rhyim Young Mok,Kim Hyong Kuk,Kim Yang Do 한국분말야금학회 2005 한국분말재료학회지 (KPMI) Vol.12 No.3

Nickel powders were synthesized by the hydrazine reduction of nickel chloride solution containing ammonia in DEA solutions. The size distribution of nickel powders were investigated as a function of ammonia concentration, hydrazine concentration and the mixed composition ratio of diethanolammine (DEA) and triethanolammine (TEA). Nickel powders with the size in submicron range were obtained at $185^{\circ}C$ for 45 minutes by hydrazine reduction of nickel chloride solution in DEA solutions. The hydrazine concentrations showed significant effects on the particle size and shape distribution of nickel powders under $NH_3/Ni^{2+}$ molar ratio of 2.0 condition. As the mixed volume ratio of TEA and DEA increased, nickel powders with relatively larger particle size and low agglomeration were obtained. Nickel powders with particle size in the ranged from 0.4 to $0.9\;{\mu}m$ were obtained at the 50 $vol.%$ of TEA.

환자안전사건 조사용 근본원인분석 소프트웨어의 비교

최은영,이현정,옥민수,조민우,이상일,Choi, Eun-Young,Lee, Hyeon-Jeong,Ock, Min-Su,Jo, Min-Woo,Lee, Sang-Il 한국의료질향상학회 2017 한국의료질향상학회지 Vol.23 No.1

Root Cause Analysis (RCA) has been widely used as a structured approach to investigate patient safety incidents. RCA helps identify what, how, and why something happened, therefore preventing recurrence of incidents. Since many quality tools can be used during RCA, various formats of RCA exist. If RCAs are performed incorrectly or incompletely, they are likely to produce unusable results. To address this issue, RCA software has been developed. The use of RCA software in investigating patient safety incidents may offer several advantages, such as potential reduction in learning time, shortening of the analytic process, facilitation of collection, analysis, and presentation of data and production of meaningful RCA reports. We introduced six healthcare RCA software and compared characteristics. Results from this study will enable the RCA team to choose proper RCA software.

상악 영구중절치의 외상환자에서 치아파절편을 이용한 치험례

최은영,최남기,양규호,Choi, Eun-Young,Choi, Nam-Ki,Yang, Kyu-Ho 대한소아치과학회 2003 大韓小兒齒科學會誌 Vol.30 No.4

상악 영구전치의 외상은 소아와 청소년기에 많이 일어난다. 그 중 치관의 파절은 18세 이하의 외상성 손상의 1/4에서 나타난다. 이러한 치관파절시 심미적 기능적으로 만족시킬 수 있는 수복을 하려는 노력이 계속되어 왔다. 파절편을 이용한 수복은 이러한 심미적 기능적인 조건을 만족시킬 수 있는 방법이다. 본 증례들은 전남대학교병원 소아치과에 상악중절치의 외상을 주소로 내원한 아동들의 치험례이다. 증례 1은 미성숙영구치치근을 가지는 만 7세의 여아로 침상출혈에 따른 수산화칼슘을 이용한 직접치수복조후 파절편을 부착한 증례이며, 증례 2는 함입과 치관파절로 인해 치수노출을 보인 만 10세 남아로 resin-wire splint 후 치수치료 하고 파절편을 부착하였고, 증례 3은 파절선이 생리적 폭경을 침범한 8세 여아로 별다른 처치 없이 파절편 부착을 시행하였다. 이상의 증례들을 통하여 치아 파절편 부착을 성공적으로 시행하였으며, 심미적으로 양호한 결과를 얻었다. Dental injuries with crown fracture occur frequently, especially in young patient Reattachment of the crown fragment has been shown to yield good esthetic results in that original tooth anatomy is restored with a material that abrades at a rate indntical to that of the adjacent tooth substance and at the same time permits continual monitoring of pulpal status through the fragment. Case 1 was complicated crown fracture with pin-point bleed ing, that was treated by direct pulp capping with calcium hydroxide and fragment reattachment. Case 2 was in trusive luxation with complicated crown fracture and was treated by pulp treatment and fragment reattachment. Case 3 was uncomplicated crown fracture, and fracture line involved slightly biologic width and treated by reattachment of the crown fragment.

DEA 용액으로부터 히드라진의 환원 반응에 의한 니켈 분말 제조

최은영,이윤복,윤석영,김광호,김진천,임영목,김형국,김양도,Choi, Eun-Young,Lee, Yoon-Bok,Yoon, Suk-Young,Kim, Kwang-Ho,Kim, Sin-Chun,Rhyim, Yaung-Mok,Kim, Hyong-Kuk,Kim, Ynng-Do 한국세라믹학회 2005 한국세라믹학회지 Vol.42 No.6

Nickel powders synthesized by the reduction of hydrazine of nickel salts fiom diethanolamine(DEA) solution, and investigated the morphological characteristics of nickel powders with the addition of hydrazine, reaction temperature, the composition of mixed solvents. The addition of hydrazine in DEA solution largely affected on size control of nickel powders. Under $N_2H_4/Ni^{2+}$ molar ratio= 1.5 and 2.0 conditions, spherical nickel powders in the submicron range obtained, owing to higher the reduction rate. An increase of temperature increased the size of nickel particles. At $220^{\circ}C$ for 40 min, the nickel powders composed of polyhedral particles with high crystalline in the submicron range. The mixed volume ratio of TEA to DEA affected on the increase of particle size and the inhibition of agglomerate between particles.

사용자 가치 기반에 의한 교육용 모바일 앱의 UX디자인 설계전략

최은영,Choi, Eun-Young 한국정보통신학회 2017 한국정보통신학회논문지 Vol.21 No.7

디지털 미디어의 활용이 활발하게 진행됨에 따라 UI/UX에 대한 관심 및 중요성이 증가하고 있다. 이에 교육용 모바일 앱 개발 시 가치분석 모형을 바탕으로 디자인 평가 모형을 설계하고 이를 바탕으로 한 개발방향을 제시하고자 한다. 소비자 가치 분석을 바탕으로 한 디자인 평가모형의 주요 요인들은 소비자의 지속적 사용에 영향을 미친다. 이에 앱 개발 시 기존 애자일 방식의 개발 단계에 사용자 가치 분석을 바탕으로 한 디자인 평가 주요 요인들을 반영하게 되면 최적의 UX환경을 제공할 수 있다. 이렇게 개발된 앱은 소비자에게 만족감을 높여주게 되어 지속적인 사용에 긍정적인 영향을 미칠 것으로 기대한다. With the active usage of digital media, the importance of and the interest in User Interface (UI)/User Experience (UX) have been increasing. This study proposes the development of design evaluation model to utilize the quality analysis model as a basis if there were to be a development of mobile education application. Main factors of the design evaluation model, which is based on User Value analysis, influence users' attitudes and intentions in continuing their uses of a mobile education application. The employment of the design evaluation factors onto the existing agile method's development stage, therefore, would provide an optimal UX environment for the application. This application not only will increase the satisfactions of consumers, but also will have positive impacts on their intentions in continuing their uses of a mobile education application.

고효율의 용액공정용 유기 발광 다이오드 제작을 위한 ITO 전처리 연구

최은영,서지현,최학범,제종태,김영관,Choi, Eun-Young,Seo, Ji-Hyun,Choi, Hak-Bum,Je, Jong-Tae,Kim, Young-Kwan 한국전기전자재료학회 2010 전기전자재료학회논문지 Vol.23 No.1

We demonstrated that the solution processed organic light-emitting diodes (OLEDs) have the high efficiency with pre-treated indium-tin-oxide (ITO). ITO surface was pre-treated with four methods and compared each other. The pre-treatment of ITO surface improves the chemical and physical characteristics of ITO such as the surface roughness, adhesion property, and the hole injection ability. These properties were analyzed by the contact angle, atomic force microscope (AFM) image, and the current flow character in device. As a results, the device with ITO pre-treated by $O_2$ plasma shows the current efficiency of 5.93 cd/A, which is 1.5 times the device without pre-treatment.

산화질소가 미생물에 미치는 영향 및 이를 이용한 항균전략

최은영,노진기,핫산눌하스니,유진욱,Choi, Eun Young,Noh, Jin-Ki,Hasan, Nurhasni,Yoo, Jin-Wook 한국미생물학회 2014 미생물학회지 Vol.50 No.2

인체의 항상성 유지에 필수적인 물질로 알려진 산화질소는 인체를 침입한 미생물로부터 보호하는 면역반응에서 매우 중요한 역할을 담당하고 있다. 산화질소는 미생물에 직간접적으로 작용하여 다양한 기전으로 항균작용을 나타낸다. 항생제의 심각한 내성이 심각한 사회적 문제로 대두되면서 새로운 계열의 항생제 개발이 절실한 시점에서 항균물질로서의 산화질소에 대한 연구가 활발히 진행되고 있다. 하지만 매우 짧은 반감기와 기체분자인 산화질소를 항생제로 이용하기 위해서는 산화질소의 저장과 방출을 제어할 전략 필요하다. 본 총설에서는 산화질소의 체내에서의 생화학적 특성과 항균작용을 나타내는 다양한 기전에 대해 설명하였다. 또한 산화질소 방출을 조절하여 항균작용을 향상시키는 최근의 연구에 대해 알아보았다. Nitric oxide (NO), which has been recognized as an integral molecule in maintaining homeostasis, plays an important role in host defense against microbes. NO has diverse antimicrobial mechanisms by directly and/or indirectly interacting with microbes. Under the circumstance that there is an urgent need for a new class of antimicrobial agents due to antibiotic resistance, much effort has been made to develop a NO-based antimicrobial agent. In order to make it possible, strategies to store and release NO in a controlled manner are required because NO has a gaseous property and a very short half-life. In this review, we described NO biochemistry and its mechanisms of antimicrobial activity. In additions, we introduced various NO-releasing systems that improve NO's antimicrobial activity.

A Case of Progressive Ductal Constriction in a Fetus

최은영,Mei-Hua Li,Chang Won Choi,Kyo Hoon Park,최정연 대한심장학회 2013 Korean Circulation Journal Vol.43 No.11

The ductus arteriosus is a normal and essential structure in fetal circulation. Since the introduction of fetal echocardiography, there have been reports of ductal constriction, many of which were related to maternal use of some medications. However, there have been some reports of idiopathic ductal constriction, which usually present in later gestation. Recently we experienced a case, which initially showed an S-shaped ductus with mild narrowing at 23 weeks and 27 weeks gestation and developed severe ductal constriction at 33 weeks. Soon after birth, ductus was searched for but no ductus was found in 2-D and color images. The neonate required mechanical ventilation with supplemental oxygen for 3 days. All echocardiographic abnormalities were normalized in 7 months. We report progressive ductal constriction in an S-shaped ductus and emphasize the importance of continuous follow up extending to the third trimester and even immediately after birth.

여성의 피부유형상태에 영향을 미치는 요인분석

최은영,나영순,백승화,Choi Eun-Young,Na Young-Soon,Baek Seung-Hwa 대한예방한의학회 1999 대한예방한의학회지 Vol.3 No.2

This study was carried out to evaluate factors influencing on women of skin type using Pender's Health Promotion Model. For this purpose, we surveyed 159 women from July 1 to August 22, 1998. In results of stepwise logistic analysis, these factors was shown significant habit of practice and skin care experience (p<0.05). Groups which did not practice showed the probability of 13.49 times in neutral skin. Groups which experienced skin care showed the probability of 5.16 times in neutral skin. These results suggested that it was to develop the instrument for measurement of skin type.

온라인 수업에 참여한 간호대학생의 딴짓에 영향을 미치는 요인

최은영,윤지영,박신영,Choi, Eun-Young,Yun, Ji-Yeong,Park, Shin-Young 한국융합학회 2020 한국융합학회논문지 Vol.11 No.9

본 연구는 온라인 수업에 참여한 간호대학생의 딴짓에 영향을 미치는 요인을 파악하기 위해 수행하였다. 자료수집은 3개 대학에 재학 중인 간호대학생 304명을 대상으로 2020년 4월 20일부터 4월 30일까지 구조화된 자가 보고식 설문지 작성을 통해 수집하였다. 자료 분석은 SPSS 26.0 program을 이용하여 T-test, ANOVA, Pearson's correlation coefficient, multiple regression을 이용하였다. 연구결과, 딴짓은 흥미도(r=-17, p=.003), 이해도(r=-19, p=.001), 필요도(r=-12, p=.031), 학습동기(r=-12, p=.046), 자기조절효능감(r=-11, p=.040), 학습자신감(r=-14, p=.017), 강의만족도(r=-22, p<.001), 강의몰입(r=-24, p<.001)과 유의한 상관관계를 보였다. 또한 학습자신감(β= -.20), 토론 및 발표선호정도(β= .19), 강의몰입(β= -.15), 강의만족도(β= -.15)이 딴짓에 유의한 영향을 미치는 것으로 확인되었으며(F=9.95, p<.001), 모형의 설명력은 10.6%였다. 본 연구를 통해 온라인 수업에 있어 간호대학생의 딴짓을 감소시키기 위한 교수학습방법 및 프로그램의 개발을 제언한다. This study was conducted to identify the factors that influence the other behaviors taken by nursing students during online lectures. The study subjects were 304 nursing students in three universities. Data were collected between April 20 and 30, 2020, using by completing structured self report questionnaires. Data were analyzed using T-test, ANOVA, Pearson's correlation coefficient, and multiple regression using SPSS 26.0 program. In correlation analysis, significant negative correlations were found between other behaviors, interest(r=-17, p<.01), understanding(r=-19, p<.01), needs(r=-12, p<.05), learning motivation(r=-12, p<.05), self-regulation efficacy(r=-11, p<.05), learning confidence(r=-14, p<.05), lecture satisfaction(r=-22, p<.01), lecture flow(r=-24, p<.01). In the multiple regression analysis, learning confidence, prefer to discuss & present (β=.19), lecture flow(β=-.15), lecture satisfaction(β=-.15) were statistically significant factors that explained 10.6% of variance of other behaviors taken by nursing students during online lectures. Thus, we suggest to develop that teaching methods and programs to reduce other behaviors taken by nursing students during online lectures.