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Controlled-crystallinity of SiO2/TiO2 hollow nanoparticles and their electroresponsive behaviors
김보미,박소희,이승애 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.104 No.-
Titania has been frequently used as an electrorheological (ER) particle in ER fluids owing to its highdielectric constant. Additionally, titania possesses the ability to control the crystallinity range of particles. In this study, we investigated the effect of crystallinity control ability of titania on the performance of ERfluids, by adjusting the crystallinity of SiO2/TiO2 hollow nanoparticles (HNPs) through heat treatment attemperatures 200, 900, 1000, and 1100 C. The morphologies of the pristine and heat-treated HNPs confirmedby transmission electron microscopy (TEM) images, and HNP treated at 1100 C exhibited the largestgrain size. The X-ray diffraction (XRD) patterns confirmed that as the annealing temperatureincreased, the crystallinity of titania increased, resulting in sharper, stronger characteristic peaks. Furthermore, it is revealed that variations in the crystalline structure and shell thickness induced changesin ER properties such as the loss tangent and charge accumulation. The loss tangent decreased with anincrease in grain size considering the decrease in charge accumulation sites. To the best of our knowledge,this is the first study to report this novel insight, and it can be applied to subsequent studies forachieving high ER performance, and thus, realizing practical commercialization of ER fluids.
출산모의 신체상, 어머니 역할 수행 만족도가 산후우울에 미치는 영향
김보미 사단법인 인문사회과학기술융합학회 2019 예술인문사회융합멀티미디어논문지 Vol.9 No.12
This study is a descriptive research study to identify the effects of body image and satisfaction in the role of mothers on postpartum depression. The research subjects and data collection period was from Nov. 1, 2018 to Dec. 31, 2018, and 123 mothers gave birth to normal newborn babies at the A city General Hospital. Using the SPSS 22.0 program, Collected data were analyzed by means of SPSS 22.0 program, and general traits t-test and ANOVA, post examination, Sheffe’s test, grade point average, standard deviation, Pearson’s correlation, and stepwise multiple regression. The study found that a body image and satisfaction in the role of mothers are positive correlations (r=.68, p<.001 showed a negative correlation between satisfaction in the role of mothers and postpartum depression (r=-.80, p<.001) was shown. the relationship between body image and postpartum depression (r=-.77, p<.001). The significant variables affecting postpartum depression were body Image, satisfaction in the role of mothers, family support, and relationship with husband, with 79.3% overall explanatory power. Based on this study, it is necessary to identify factors on postnatal care in pregnant mothers and to develop postpartum care programs that can improve their ability to cope with postpartum depression. 본 연구는 출산모의 신체상, 어머니 역할 수행 만족도가 산후우울에 미치는 영향을 파악하기 위한 서술적 조사연구이다. 연구대상자 및 자료수집 기간은 2018년 11월 1일부터 12월 31까지였고, 연구대상자는 A시 종합병원에서 정상신생아를 출산한 산모 123명이었다. 자료 분석은 SPSS 22.0 program을 활용하여 일반적인 특성은 t-test, ANOVA, 사후 검정은 sheffe’s test, 평균평점, 표준편차, Pearson’s correlation, stepwise multiple regression으로 분석하였다. 연구 결과 대상자의 신체상과 어머니 역할 수행 만족도는 양의 상관관계(r=.68, p<.001)를 보였고, 어머니 역할 수행 만족도와 산후우울은 음의 상관관계(r=-.80, p<.001)를 보였다. 신체상과 산후우울은 음의 상관관계(r=-.77, p<.001)가 있었다. 출산모의 산후우울에 영향을 미치는 유의한 변수는 신체상, 어머니 역할 수행 만족도, 가족의지지, 남편과의 관계였고 전체 설명력은 79.3%이었다. 본 연구를 바탕으로 출산모의 산후우울에 미치는 요인을 파악하고, 산후우울 대처능력을 향상시킬 수 있는 산후관리 프로그램의 개발이 필요하다.
김보미,김재희,Kim, Bomi,Kim, Jaehee 한국통계학회 2013 응용통계연구 Vol.26 No.1
미국 달러에 대한 한국원화의 17년간 일별 원/달러 환율 시계열 데이터에 대하여 정상 시계열 ARIMA 모형과 변동성을 포함한 시계열 모형인 ARIMA+IGARCH 모형을 적합하여 비교하고 예측을 실시하였다. 또한 환율 데이터에 구조변화가 있어 보이므로 선형구조를 포함한 구조 변화 모형과 자기상관 구조를 포함한 구조 변화 모형을 이용하여 변화점을 추정하고자 한다. ARIMA and ARIMA+IGARCH models are fitted and compared for daily Korean won/US dollar exchange rate data over 17 years. A linear structural change model and an autoregressive structural change model are fitted for multiple change-point estimation since there seems to be structural change with this data.
김보미,윤선옥,김동일,국명철,홍은경 대한병리학회 2007 Journal of Pathology and Translational Medicine Vol.41 No.6
Myxoid variant of adrenal cortical carcinoma is extremely rare and there have been only 16 such cases reported in the medical literature. Here we report on a case of 43-year-old woman with a left adrenal mass that was detected during the evaluation for Cushing’s syndrome. Left adrenalectomy was performed and the tumor weighed 347 g. The cut surface was predominantly myxoid and gelatinous with central hemorrhage and necrosis. Histologically, the tumor cells were rather small, uniform and polygonal with mild pleomorphism. It showed diverse morphologic patterns according to the amount of the myxoid stromal component. Making the diagnosis was not easy because the tumor was without areas of conventional adrenocortical carcinoma. Immunohistochemically, the tumor cells were positive for α-inhibin, synaptophysin and vimentin, but the tumor cells were negative for pan-cytokeratin and CAM 5.2. The immunophenotypes were identical to those of conventional adrenal cortical neoplasms. During the evaluation of a cytokeratin-negative and vimentin-positive retroperitoneal neoplasm with a myxoid component, the possibility of adrenal cortical tumor should be considered in spite that this is a very rare entity.