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.

편측성 안면 신경마비 환자에서의 총의치 수복 증례

최은영,이지현,최순영,Choi, Eunyoung,Lee, Ji-Hyoun,Choi, Sunyoung 대한치과보철학회 2017 대한치과보철학회지 Vol.55 No.4

벨마비는 원인이 명확하지 않은 급성 말초성 안면 신경마비로 주로 편측으로 나타난다. 일부에서는 완전히 회복되지 못하여 안면 근육의 불완전 마비, 구축 등의 후유증으로 인해 하악의 편측 변위 또는 편측 저작 습관 및 부조화가 나타나며, 따라서 만약 무치악 환자에서 총의치로 수복한다면 더욱 세심한 주의가 필요하다. 본 증례에서는 벨마비의 후유증과 불안정한 하악 운동으로 인해 술자에 의한 중심위 채득이 어려운 무치악 환자에서 고딕아치 묘기법으로 재현성 있는 중심위를 채득하고, 중심위와 환자의 습관적인 하악 기능 운동 범위 간의 자유도 부여를 위해 설측 교합을 이용하여 총의치를 제작함으로써 기능 및 심미적으로 양호한 결과를 얻었기에 보고하는 바이다. Bell's palsy is an acute-onset unilateral peripheral facial neuropathy. For patients with sequelae of facial paresis, the successful rehabilitation of fully edentulous arches is challenging. This case report described the treatment procedures and clinical considerations to fabricate complete dentures of a patient who showed unilateral displacement of mandible, unilateral chewing pattern and parafunctional jaw movement due to sequelae of Bell's palsy. Gothic arch tracing was used to record reproducible centric relation and lingualized occlusion was performed to provide freedom to move between centric relation and the patient's habitual functional area in fabricating satisfactory dentures in terms of function and esthetics.

고전압맥동전류자극이 흰쥐 창상 치유에 미치는 영향

최은영,이재형,제갈승주,Choi, Eun-Young,Lee, Jae-Hyoung,JeKal, Seung-Joo 대한물리치료과학회 1995 대한물리치료과학회지 Vol.2 No.2

The purpose of this study was to determine the effects of high voltage pulsed current (HVPC) stimulation on wound healing. Thirty-four Sprague-Dawley adult female rats were assigned to experimental and control groups. Each rats were anesthetized with pentotal sodium, and a 10 mm full-thickness incision was made on the back. From 24 hours after surgery, the rats of experimental groups were stimulated with HVPC, $140{\mu}s$, 120 pps, 30-40 V for 30 minutes, daily. The rats were sacrified 2 days, 4 days and 6 days after stimulation, respectively. The skin was removed, and processed for light microscopic examination. The length of incisional wounds were measured by microcaliper, and nucleolar organizer regions were counted under light microscope. For the histological observations the specimens were stained with Hematoxylin and Eosin, Masson Trichrome, Gomori Reticulum and Ag-NOR. There was a significant decrease in the length of incisional wound in experimental group compared with control group at 6 days HVPC stimuation (p<0.05). In experimental group, wound were significant difference (p<0.01) between the duration of post surgery. The mean numbers of nucleolar organizer regions per nucleus were significantly increased in the experimental group at 6 days HVPC stimulation (p<0.05), and were significantly difference (p<0.01) between the duration of post surgery in experimental group. Histological examination of the wound site suggested a more rapid of epithelialization and collagen formation between experimental groups compared with control groups. The result may indicated that the HVPC with $140{\mu}s$, 120 pps, 30-40 V for 30 minutes promoted surgical wound healing in the rat.

비수용성 매질로부터 Ni(OH)₂ 반응슬러리의 환원반응에 의한 니켈 분말의 제조

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 한국재료학회 2005 한국재료학회지 Vol.15 No.5

Nickel Powders were synthesized by the reduction of $Ni(OH)_2$ reactant slurries from nonaqueous media, and the morphological characteristics of nickel powders with the addition of NaOH, the composition of mixed solvents, reaction temperature and reaction time were investigated. The NaOH addition changed the structure of agglomeration in the submicron range. As the volume ratio of TEA to DEA increased, the powders slightly suppressed the agglomeration between particles and their size increased. The reaction temperature on size and shape of nickel powders was significant. As reaction time was shortened from 40 min to 0.3 min at $220^{\circ}C$, size distribution of nickel powders was transferred to a narrow size distribution owing to the presence of smaller particles with below $1.0\;{\mu}m$.

ERRATUM : 반밀폐형 온실 내에서 탄산가스 시비에 따른 광강도와 엽온에 반응한 토마토 잎의 최대 카복실화율, 전자전달율 및 광합성율 실측값과 모델링 방정식에 의한 예측값의 비교

최은영,정영애,안승현,장동철,김대현,이동수,권진경,우영회,Choi, Eun-Young,Jeong, Young-Ae,An, Seung-Hyun,Jang, Dong-Cheol,Kim, Dae-Hyun,Lee, Dong-Soo,Kwon, Jin-Kyung,Woo, Young-Hoe 한국생물환경조절학회 2022 생물환경조절학회지 Vol.31 No.1

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.

미술치료의 치료요인 범주화 연구 -미술치료서비스 제공자를 대상으로-

최은영 ( Choi Eun-yeong ),이영숙 ( Lee Young-sook ),손병문 ( Son Byeong-mun ),오지은 ( Oh Jee-eun ) 대구대학교 특수교육재활과학연구소 2019 특수교육재활과학연구 Vol.58 No.2

본 연구에서는 미술치료서비스 제공자들이 범주화한 미술치료 치료요인을 확인하고자 하였다. 본 연구에서는 개념도 방법으로 현장에서 미술치료서비스를 제공하고 있는 10명의 연구참여자를 대상으로 진행하였다. 이영숙, 최은영과 공마리아(2017)이 도출한 66개의 최종 진술문을 사용하여, 각각 카드로 제작한 후, 연구참여자가 각 카드를 유사성에 따라 분류하고, 각 진술문에 대해 미술치료 치료요인으로서 중요도를 5점 척도로 평정하도록 하였다. 본 연구의 자료처리는 다차원척도법과 위계적 군집분석을 실시하였다. 연구결과는 다음과 같다. 미술치료서비스 제공자들의 미술치료 치료요인은 개념도 상 2차원 6개로 범주화되었다. 2개의 차원은 ‘내적경험의 공유와 외현화’, 그리고 ‘창조성과 안정화’이며, 6개로 범주화된 치료 요인은 ‘표현의 용이성과 안전한 치료환경’, ‘상징화를 통한 다양하고 새로운 문제해결 시도’, ‘시각적 외현화를 통한 자기이해’, ‘창의적 치료경험’, ‘치료자와의 미술작품 공유’, ‘감각기억활성화를 통한 문제접근 용이성’으로 나타났다. 본 연구는 미술치료 치료요인을 미술 치료서비스 제공자를 통해 체계적으로 분류하여 범주화하였다는 점에서 의의가 있다. This study sought to identify the art therapy therapeutic factors categorised by art therapy service providers. The concept mapping method was conducted to 10 participants who were providing art therapy services on field. 66 final statements derived by Lee et al.(2017) was used, each of them was made with a card, and each statement was classified by a research participant according to its similarity, and its importance as a therapeutic factor for art therapy was leveled on a five-point scale. Data processing was done with multidimensional scaling method and hierarchical clustering analysis. The results found that categorization of the therapeutic factors of art therapy by art therapy service providers was divided into six two-dimensional categories on a concept map.The two dimensions were ‘creative and stabilizing’ and ‘sharing of internal experience and externalizing.’ The six categorised therapeutic factors were ‘ease of expression and safety treatment environment’, ‘trying various and new problems solving through visualization’, ‘self-understanding through visual externalization’, ‘experience of creative treatment’, ‘sharing art works with the therapist’ and ‘ease of problem access through sensory memory activation’. This study is meaningful in that categorized and classified therapeutic factors of art therapy systematically by art therapy service providers.

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.

Li₂O-LiCl 용융염에서의 다공성 양극 슈라우드를 이용한1kg 우라늄산화물의 전해환원

최은영,이정,전민구,이상권,김성욱,전상채,이주호,허진목,Choi, Eun-Young,Lee, Jeong,Jeon, Min Ku,Lee, Sang-Kwon,Kim, Sung-Wook,Jeon, Sang-Chae,Lee, Ju Ho,Hur, Jin-Mok 한국전기화학회 2015 한국전기화학회지 Vol.18 No.3

사용후핵연료 재활용을 위한 파이로프로세싱의 전해환원 공정에서는 $Li_2O-LiCl$ 용융염을 전해질로 사용하며 금속산화물 형태의 사용후핵연료를 음극, 백금을 양극으로 사용하여 금속전환체를 제조한다. 따라서, 음극에서는 금속산화물이 금속으로 전환되는 환원반응으로 인해 산소 이온이 생성되고, 양극에서는 그 산소이온이 산소 가스가 되는 산화반응이 발생한다. $650^{\circ}C$의 운전 온도에서 발생하는 양극의 산소 가스로 인한 금속 재질 장치의 부식을 막기 위해 양극을 둘러싸는 슈라우드(shroud)를 사용해 산소 가스를 포집하여 전해질로의 확산을 막는 동시에 장치 외부로 배출되도록 한다. 기존에는 슈라우드 자체의 부식과 산소 가스의 염 내 확산을 방지하기 위하여 세라믹을 사용하였으나 비다공성 재질로 인해 산소 이온의 백금 표면으로의 이동 경로를 제한하여 공정의 속도를 좌우하는 전류 크기를 낮춘다는 문제점이 있었다. 이러한 문제를 극복하기 위하여 스테인레스 스틸 mesh로 구성된 다공성 슈라우드의 사용이 수 그램 규모 실험을 통해 제안된 바 있다. 본 연구에서는 킬로그램 규모의 우라늄산화물 전해환원 운전을 통해 다공성 슈라우드의 안정성을 확인 하고자 하였다. 음극의 우라늄산화물로는 크기 1~4 mm, 밀도 $10.30{\sim}10.41g/cm^3$의 파쇄 펠렛 1 kg이 사용되었으며, 백금 전극과 다공성 슈라우드가 포함된 양극 모듈을 사용하였다. 전해환원 종료후 음극에서 우라늄 금속이 성공적으로 얻어졌으며, 백금 양극 및 다공성 슈라우드도 손상 없이 안정하게 사용되었다. $650^{\circ}C$에서의 LiCl의 점도와 동일한 물과 에틸렌글리콜의 혼합물에서 산소 가스를 주입하여 확인 결과 산소 버블이 다공성 슈라우드 외부로 유출되는 것은 관찰되지 않았다. The platinum anode for the electrolytic reduction process is generally surrounded by a nonporous ceramic shroud with an open bottom to offer a path for $O_2$ gas produced on the anode surface and prevent the corrosion of the electrolytic reducer. However, the $O^{2-}$ ions generated from the cathode are transported only in a limited fashion through the open bottom of the anode shroud because the nonporous shroud hinders the transport of the $O^{2-}$ ions to the anode surface, which leads to a decrease in the current density and an increase in the operation time of the process. In the present study, we demonstrate the electrolytic reduction of 1 kg-uranium oxide ($UO_2$) using the porous shroud to investigate its long-term stability. The $UO_2$ with the size of 1~4mm and the density of $10.30{\sim}10.41g/cm^3$ was used for the cathode. The platinum and 5-layer STS mesh were used for the anode and its shroud, respectively. After the termination of the electrolytic reduction run in 1.5 wt.% $Li_2O-LiCl$ molten salt, it was revealed that the U metal was successfully converted from the $UO_2$ and the anode and its shroud were used without any significant damage.

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.