• 한국분말재료학회지
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• 제24권3호
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• pp.242-247
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• 2017

In this study, the electroless nickel plating method has been investigated for the coating of Ni nanoparticles onto fine Al powder as promising energetic materials. The adsorption of nickel nanoparticles onto the surface of Al powders has been studied by varying various process parameters, namely, the amounts of reducing agent, complexing agent, and pH-controller. The size of nickel nanoparticles synthesized in the process has been optimized to approximately 200 nm and they have been adsorbed on the Al powder. TGA results clearly show that the temperature at which oxidation of Al mainly occurs is lowered as the amount of Ni nanoparticles on the Al surface increases. Furthermore, the Ni-plated Al powders prepared for all conditions show improved exothermic reaction due to the self-propagating high-temperature synthesis (SHS) between Ni and Al. Therefore, Al powders fully coated by Ni nanoparticles show the highest exothermic reactivity: this demonstrates the efficiency of Ni coating in improving the energetic properties of Al powders.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2010년도 하계학술대회 논문집
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• pp.242-242
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• 2010

산화 알루미늄($Al_2O_3$) 박막을 p-type Czochralski(CZ) Si 위에 Remote Plasma Atomic Layer Deposition(RPALD)을 이용하여 저온 공정으로 증착하였다. Photolithography 공정으로 grid 패턴을 형성한 후 열 증착기로 알루미늄을 증착하여 MIS-IL (Metal-Insulator-Semiconductor Inversion Layer) solar cell을 제작하였다. 반응소스로는 Trimethylaluminum (TMA)과 $O_2$를 이용하였다. $Al_2O_3$ 박막의 전기적 특성 평가를 위해 MIS capacitor를 제작하여 Capacitance-voltage (C-V), Current-voltage (I-V), Interface state density ($D_{it}$)를 평가하였으며 Solar simulator를 이용하여 MIS-IL Solar cell의 Efficiency을 측정하였다.

• 한국염색가공학회지
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• 제26권3호
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• pp.242-253
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• 2014

Morinda citrifolia, commercially known as Noni, is a tree that grows widely throughout the Pacific, and is recognized as one of the most significant sources of traditional medicines among Pacific Island societies. All parts of the plant have traditional and/or modern uses, including roots and bark(dyes, medicine), trunks(firewood, tools), and leaves and fruits(food, medicine). The bark and the roots of the tree contain red and yellow pigments respectively, which are both used in the manufacture of dyes. Dyes from Noni are being used traditionally, to color clothing and fabrics. In this study, mordanting effects on the dyeing properties of Noni root extract on silk fabrics were investigated.

• Pediatric Gastroenterology, Hepatology & Nutrition
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• 제22권3호
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• pp.242-248
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• 2019

Purpose: Severe acute malnutrition (SAM) is an important public health problem which contributes to significant number of under five deaths. Protocol based management significantly decreases risk of deaths in children with medical complications. Methods: Outcome of children aged 2 months-5 years admitted and fulfilling definition of SAM having diarrhea (group A) was compared to children with SAM having medical complications other than diarrhea (group B). Both groups were managed according to standard recommended protocols and monitored and followed up for 12 weeks after discharge. Results: The average weight gain, defaulter rate, primary failure, secondary relapse rate and readmission rate were similar in both groups. Length of stay in group A was three days longer (p-value=0.039). Discharge rate was comparable with overall 68% of children successfully discharged and 50% of children reaching weight/height > -2 standard deviation at follow-up of 12 weeks. Conclusion: The current management protocol is equally effective for managing children with SAM having diarrhea. Good adherence to management protocol of dehydration and timely modification of therapeutic feeds in children with persistent diarrhea results in satisfactory weight gain.

• The Journal of Korean Physical Therapy
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• 제34권5호
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• pp.242-247
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• 2022

Purpose: This study investigates the effect of 60° semi-squat exercises according to three different types of support surfaces. The effects were examined on joint position sense and balancing ability using stable and unstable surfaces in patients afflicted with post-stroke hemiplegia. Methods: Subjects were instructed to perform three sets of 60° semi-squat exercises according to the characteristics of the support surface conditions. The three ground states were bilateral stable surface (BSS), nonaffected side unstable surface (NUS), and bilateral unstable surface (BUS). The joint position sense, characteristics of body sway, and dynamic balance were analyzed according to floor conditions before and after the experiment. A balance-pad (50 cm W×41 cm L×6 cm H; Alcan Airex AG, Sins, Switzerland) was used for the unstable floor. Results: The 60° semi-squat exercises applied to hemiplegic patients showed the highest statistical significance in joint position sense in the NUS group, and Timed Up and Go test (TUG) in the BUS group (p<0.05). Conclusion: Functional training using an unstable surface can be applied as a meaningful intervention method for improving the balance and joint position sense of stroke patients.

• 생태와환경
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• 제56권3호
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• pp.242-249
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• 2023

The aquarium pet trade is a source of potentially invasive crayfish species, which can be subsequently intentionally or unintentionally introduced into new environments. There were 34 species of freshwater crayfish imported into Korea for ornamental purposes. Starting with 1 species in 2008, it shows a trend of continuous increase every year with the maximum of 25 species in 2020. The number of freshwater crayfish imported into Korea for ornamental purposes was 1,172,159, with an annual average of 78,144 being imported. The population also recorded a record high in 2017 with a 38% increase in population imports compared to the previous year. Among the 34 pet crayfish imported into Korea, four species classified as high-risk and managed in the US and Europe were American crayfish (Procambarus clarkii), Cherax quadricarinatus, Cherax cainii, and Cherax destructor. In addition to American crayfish (P. clarkii), 3 types of high-risk invasive crayfish are designated as legally managed species by conducting an ecological risk assessment, raising awareness among importers, retailers and consumers through awareness-raising education on freshwater crayfish, and measures for route management such as species identification and improvement of labeling methods are needed.

• 의료커뮤니케이션
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• 제13권2호
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• pp.141-148
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• 2018

Background: The purpose of this study is to identify the degree of emotional labor, mental health care, care performance of certified caregivers for elder with dementia, and the factors that affect care performance. Methods: In order to collect data, structured questionnaire was used for 197 caregivers who worked at 3 dementia specialized facilities located in D city. Data were analyzed by t-test, ANOVA, correlation and multiple regression using SPSS/WIN 20.0. Results: Care performance had negative relationship with emotional labor(r=-.320, p<.000) and mental health(r=-.240, p<=001). Emotional labor had positive relationship with mental health(r=.208, p=.003) And the prediction factors influencing care performance were health status(${\beta}=.363$, p<.001), emotional labor(${\beta}=-.242$, p<.001), mental health(${\beta}=-.223$, p=.001). The total variance was 38.9% by predictors(F=25.978, p<.001). Conclusion: Based on the results of this study, in order to improve the care performance mental health program should be provided and good health management is needed to improve health status. And also it is necessary to develop and apply new strategies to reduce emotional labor of the dementia facility caregivers.

• 한국산학기술학회논문지
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• 제19권6호
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• pp.500-506
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• 2018

본 연구는 119 구급대 편성 인원에 따른 중증외상환자의 병원 전 응급처치 실태를 분석하고자 2015년 1월 1일부터 12월 31일까지 J도 소속 119 구급대원에 의해 이송된 중증외상환자 1,067명 중 438명을 대상으로 수행하였으며, 수집된 자료는 IBM SPSS Statistics 21.0으로 분석하였다. 연구기간 동안 발생한 중증외상환자는 성별로는 남성이 2인 및 3인 구급대에서 각각 242명(70.6%), 66명(69.5%)으로 더 많은 빈도를 보였으며, 이들 환자가 이송된 의료기관별로는 지역응급의료센터로 이송된 비율이 각각 44.0%(151명), 49.5%(47명)로 가장 높았다. 119 구급대 편성 인원에 따른 현장 체류시간은 2인 및 3인 구급대 두 군 간에 유의한 차이를 보이지 않았으며(p=0.071), 전문기도유지술 및 정맥로 확보 시행빈도, 정맥로 확보 성공률에서도 각각 유의한 차이를 보이지 않았다(p=0.253, p=0.362, p=1.000). 본 연구 결과 단순한 양적 충원만으로는 중증외상환자의 병원 전 처치에 대한 질 향상에 영향을 주지 못하는 것으로 판단되며, 전문 인력의 확보와 함께, 직접의료지도의 단순화 및 간접의료지도의 활성화, 법적 업무범위의 확대 등이 필요하다.

• 한국광물학회지
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• 제18권1호
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• pp.1-9
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• 2005

몇 가지 점토광물과 메틸바이올로젠 또는 메틸렌블루를 함유시킨 점토수식전극을 이용하여 산소환원에 대한 전기화학적 촉매성을 검토하였다. 점토광물로는 Na-몬모릴로나이트, Ca-몬모릴로나이트, 카오리나이트를 사용하였다. 점토수식전극은 유리탄소전극 표면에 점토 현탁액을 입히고 메틸바이올로젠을 흡착시킨 것을 사용하였으며, 전기화학적 산소환원의 정도는 순환 전압전류법(cyclic voltammetry)으로 측정하였다. 실험결과, 다른 점토시료에 비하여 Na-몬모릴로나이트가 메틸바이올로젠의 흡착효과가 가장 크게 나타났고, 메틸바이올로젠을 흡착시킨 점토수식전극이 산소환원에 대한 촉매성이 월등히 우수하였다. 즉 촉매산소환원 피크가 242.6 mV 만큼 +방향으로 이동하였다. 메틸바이올로젠을 흡착시킨 점토수식전극이 메틸렌블루를 흡착시킨 점토수식전극보다 산소환원에 대한 촉매성이 더 높게 나타났다. Ca-몬모릴로나이트의 경우는 변화가 없었으나 Na-몬모릴로나이트의 구조는 메틸바이올로젠의 흡착으로 변화되었다. 메틸바이올로젠- Na-몬모릴로나이트 점토수식전극은 현탁액의 점토 농도가 약 0.87 g/10 mL이고. 메틸바이올로젠의 수용액의 농도가 대략 2.5 mM일 때 산소환원 촉매 효과가 가장 탁월하였다. 지지전해질의 pH에 따른 점토수식 전극의 산소 환원 촉매성은 중성의 pH 범위(6.3과 8.3)에서보다 산성인 pH 3.7과 알칼리성인 pH 12.7에서 월등히 크게 나타났다.

• 분석과학
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• 제11권4호
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• pp.235-242
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• 1998

이온 운반 물질로 키틴(poly-[$1{\rightarrow}4$]-${\beta}$-acetyl-D-glucosamine)을 사용하고, 지지체(matrix)로 Poly(vinyl chloride)(PVC)를, 가소제로는 Dioctyl sebacate(DOS)를 사용하여 키틴 막 전극을 제작하였다. 얇은 조각 형태의 키틴을 막자사발로 갈아 100 메시(mesh)의 체에 거른 후, 이때 모아진 일정 크기의 미세 가루를 사용하였다. 키틴 막 전극을 지시 전극으로 사용하여 금속 양이온들의 감응전위를 알아본 결과, 특히 $Cd^{2+}$와 $Cu^{2+}$에 대한 감응전위를 기울기(mV/decade)는 바탕 전해질이 pH 4 acetate buffer에서 각각 34.9 mV/decade, 34.0 mV/decade로 다른 금속 양이온들에 비하여 크게 나타났다. 또한 pH 영향을 조사해 본 결과, pH 2~12 범위에서 전위값이 일정하게 유지되었다.