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DC 마그네트론 스퍼터링 방법에 의해 증착된 Mo 박막의 특성
공선미 ( Seon Mi Kong ),소우빈 ( Yu Bin Xiao ),김은호 ( Eun Ho Kim ),정지원 ( Chee Won Chung ) 한국화학공학회 2011 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.49 No.2
Mo thin films were deposited on soda lime glass at room temperature by using DC magnetron sputtering. The electrical and structural properties of the films were investigated by varying DC power and gas pressure as the deposition parameter. As DC power increased, the deposition rate of Mo films was increased and the electrical resistivity was decreased. It was observable that the crystallinity of the films was improved with increasing DC power. As gas pressure decreased, the deposition rate and resistivity of the films were decreased, and long rectangular grains were densely formed. With increasing gas pressure, the grains were transformed to a round shape and the voids on the film surface were increased. It was confirmed that the electrical resistivity of Mo films was increased as the amount of oxygen combined with Mo atoms increased. It was also disclosed that the films have low resistivity as the degree of coupling of oxygen with Mo was reduced due to the enhancement of the crystallinity of the films.
( Seon Hwa Chung ),( Mi Kyung Kong ),( Eui Hyeok Kim ),( Sang Won Han ) 대한산부인과학회 2015 Obstetrics & Gynecology Science Vol.58 No.3
Objective The Bishop score and length of the uterine cervix are good predictors of successful labor induction. However, little is known about the association between the funneling of the uterine cervix and successful labor induction. The study aimed to evaluate cervical funneling as a predictor of successful labor induction. Methods This study was designed as a prospective observational study. Subjects who delivered a baby by labor induction were enrolled in the study from July 2011 to August 2013. Cervical funneling and length were examined with transvaginal ultrasonography. The Bishop score was rated by digital pelvic examination. Results A total of 163 primigravida women were recruited for the study. Of these, 137 participants (84.0%) delivered vaginally by labor induction. Cervical funneling was observed in 93 women (57.1%). Successful labor induction was significantly higher in patients with cervical funneling than those without it (91.4% vs. 74.3%, P<0.01), and was significantly associated with cervical funneling, as well as the Bishop score and cervical length. In a multivariate analysis, cervical funneling was an independent predictor for successful vaginal delivery by labor induction ( odd ratio, 2.70; 95% confidence interval, 1.02 to 7.10; P=0.04). However, the Bishop score and cervical length had no association with successful vaginal delivery. Conclusion This study showed that cervical funneling could be a predictive marker for vaginal delivery during labor induction.
흑미의 도정분획 메탄올 추출물의 항산화 성분 및 항산화 효과
공수현(Suhyun Kong),최용민(Youngmin Choi),이선미(Seon-Mi Lee),이준수(Junsoo Lee) 한국식품영양과학회 2008 한국식품영양과학회지 Vol.37 No.7
본 연구에서는 흑미 두 품종(흑진주벼와 흑광벼)의 도정 분획별 메탄올 추출물의 항산화 성분과 항산화 활성을 비교ㆍ분석하고자 하였다. 흑미의 항산화 성분으로 polyphenolic, flavonoid, anthocyanin과 γ-oryzanol, tocopherol 및 tocotrienol 함량을 측정하였으며 항산화 활성은 DPPH와 ABTS radical 제거능을 측정하였다. 각 도정 분획별 메탄올 추출물에서 rice bran 층에서 약 15.3~15.5%의 가장 높은 수율을 보였으며 endosperm 메탄올 추출물에서 약 0.9~1.1%의 가장 낮은 수율을 보였다. 실험결과 rice bran의 추출물에서 endosperm, whole grain의 추출물보다 높은 함량의 항산화 성분이 분포함을 확인할 수 있었다. 또한 이러한 항산화 성분이 다량 분포하는 rice bran 추출물의 우수한 항산화력을 측정할 수 있었다. 품종 간에는 흑진주벼의 rice bran 층의 항산화 성분이 흑광벼보다 높은 함량을 나타내었다. 본 연구결과 흑미의 rice bran은 기능성식품의 성분으로 활용가능성이 높을 것으로 예상된다. The colored rice, particularly black rice, has been well characterized to possess antioxidant properties. Rice bran, a by-product of the rice milling process, contains high levels of several phytochemicals which have antioxidant activities as well as health-beneficial properties. The purposes of this study were to evaluate the antioxidant compounds and antioxidant activities of the methanolic extracts from milling fractions and whole grain of two black rice cultivars. Whole black rice of the two cultivars were milled into rice bran and endosperm using the gradual milling system. These were evaluated for antioxidative activities by DPPH and ABTS radical scavenging activities. To determine the antioxidant compounds in the methanolic extract from the milling fractions, the content of polyphenolics, flavonoids, anthocycanins and γ-oryzanol were measured by spectrophotometric methods and vitamin E analysis was carried out by HPLC. The yield of whole black rice, rice bran, and endosperm were 3.1, 15.3, and 0.9% for Heugjinjubyeo and 2.7, 15.5, and 1.1% for Heugkwangbyeo, respectively. The methanolic extracts from rice bran showed generally higher antioxidant activities than the extracts from whole grain and endosperm. In addition, antioxidant compounds distributed much higher contents in rice bran extract than in the extracts from whole grain and endosperm. A significant correlation was also noted between free radical scavenging activity and polyphenolic compounds. The results of this study show that notable antioxidant activity in black rice bran are considered to have significant health benefits.
Sung Hee Jung,Seon Mi Kong,Chee Won Chung 한국태양광발전학회 2013 Current Photovoltaic Research Vol.1 No.2
Aluminum-doped zinc oxide (AZO) thin films were prepared by dc magnetron sputtering at room temperature and the effect of heat treatment on the structural, electrical and optical properties of the films were examined. As the annealing temperature and time increased, the resistivity decreased and the transmittance improved. All AZO films had c-axis oriented (002) plane of ZnO, regardless of the annealing process employed. As the annealing temperature and time increased, the crystallinity of AZO thin films increased due to the formation of a new ZnO phase in which Al was substituted for Zn. However, at the high annealing temperature of 400°C, the resistivity of the films increased via separation of Zn and Al from ZnO phase due to their low melting points. X-ray diffraction, field emission scanning electron micrograph and Hall effect measurement confirmed the formation of uniformly distributed new grains of ZnO substituted with Al. The variation of Al contents in AZO films was shown to be the primary factor for the changes in resistivity and carrier concentration of the films.
Jung, Sung Hee,Kong, Seon Mi,Chung, Chee Won Korea Photovoltaic Society 2013 Current Photovoltaic Research Vol.1 No.2
Aluminum-doped zinc oxide (AZO) thin films were prepared by dc magnetron sputtering at room temperature and the effect of heat treatment on the structural, electrical and optical properties of the films were examined. As the annealing temperature and time increased, the resistivity decreased and the transmittance improved. All AZO films had c-axis oriented (002) plane of ZnO, regardless of the annealing process employed. As the annealing temperature and time increased, the crystallinity of AZO thin films increased due to the formation of a new ZnO phase in which Al was substituted for Zn. However, at the high annealing temperature of $400^{\circ}C$, the resistivity of the films increased via separation of Zn and Al from ZnO phase due to their low melting points. X-ray diffraction, field emission scanning electron micrograph and Hall effect measurement confirmed the formation of uniformly distributed new grains of ZnO substituted with Al. The variation of Al contents in AZO films was shown to be the primary factor for the changes in resistivity and carrier concentration of the films.