Water Glass 로부터 합성한 δ- Na2Si2O5 의 세제 보조제로서의 특성

최민정,전동원,서정권,정순용,이정민 ( Min Jeong Choi,Dong Won Jeon,Jeong Kwon Suh,Soon Yong Jeong,Jung Min Lee ) 한국공업화학회 1995 공업화학 Vol.6 No.1

Water glass로 합성한 δ-Na₂Si₂O_5의 세제 보조제로서의 특성을 규명하고자 온도, pH, 상대이온에 따른 경도 성분 제거능과 세탁 성능을 조사하였다. δ-Na₂Si₂O_5의 칼슘과 마그네슘 경도 성분 제거능은 25℃에서 각각 263㎎ CaCO₃/g, 202㎎ MgO/g 정도였으며, 상대이온에 대한 영향은 경수 중의 Na^+이온의 농도가 증가할수록 경도 성분 제거능은 저하되었다. 또한 경수 용액의 초기 pH에 관계없이 일정한 경도 성분 제거능을 나타내었으며, 최종 수용액은 칼슘 경수의 경우에 pH 12 정도였고, 마그네슘 경수의 경우 pH 10 정도였다. 세제 보조제로서 δ-Na₂Si₂O_5의 첨가량이 증가할수록 세탁률은 증가하였으며, 그 최적량은 LAS 0.4g/ℓ에 대하여 δ-Na₂Si₂O_5 0.8g/ℓ 정도였다. 초기 세탁과정에서 δ-Na₂Si₂O_5는 섬유상의 침적 현상이 크게 나타났으나 헹굼 과정에서는 섬유상에 침적된 δ-Na₂Si₂O_5가 용이하게 탈착되었다. The removal of Ca^(2+)and Mg^(2+) in simulated hardness water was carried out in order to investigate the feasibility as a detergent builder of synthesized δ-Na₂Si₂O_5 from water glass. Detergency performance was also examined when δ-Na₂Si₂O_5 was used as a detergent builder with surfactant. Results show that the removal capacities of Ca^(2+) and Mg^(2+) were 263㎎ CaCO₃/g and 202㎎ MgO/g at 25℃. As the concentration of Na^+ in simulated hardness water increases, the removal capacities of Ca^(2+) and Mg^(2+) decrease. The initial pH in simulated hardness water doesn`t affect the removal performance of Ca^(2+) and Mg^(2+). The final pH was 12 for the simulated hardness water including Ca^(2+), and was 10 for the simulated hardness water including Mg^(2+). As the amount of δ-Na₂Si₂O_5 as a detergent builder increases, detergency performance increases. The optimum amount of δ-Na₂Si₂O_5 is 0.8g/ℓ for LAS 0.4g/ℓ . At the beginning of washing process, δ-Na₂Si₂O_5 was deposited significantly on fabric, but was removed easily after rinsing process.

화자 확인을 위한 다중대역에 기반한 주성분 분석 공분산 모델

최민정,이윤정,서창우,Choi, Min-Jung,Lee, Youn-Jeong,Seo, Chang-Woo 한국음성학회 2007 음성과학 Vol.14 No.2

Feature vectors of speech are generally extracted from whole frequency domain. The inherent character of a speaker is located in the low band or high band frequency. However, if the speech is corrupted by narrowband noise with concentrated energy, speaker verification performance is reduced as the individual characteristic is removed. In this paper, we propose a PCA Covariance Model based on the multiband to extract the robust feature vectors against the narrowband noise. First, we divide the overall frequency band into several subbands. Second, the correlation of feature vectors extracted independently from each subband is removed by PCA. The distance obtained from each subband has different distribution. To normalize against the different distribution, we moved the value into the normalized distribution through the mapping function. Finally, the represented value applying the weighting function is used for speaker verification. In the experiments, the proposed method shows better performance of the speaker verification and reduces the computation.

방광요관역류를 가진 소아에서의 신초음파 소견

최민정,박세진,신재일,김기혁,Choi, Min-Jung,Park, Se-Jin,Shin, Jae-Il,Kim, Kee-Hyuck 대한소아신장학회 2012 Childhood kidney diseases Vol.16 No.1

목적: 본 연구는 방광요관역류를 보이는 소아에서 신초음파 이상소견에 대해 알아보고자 하였다. 방법: 2000년 1월부터 2010년 12월까지 일산병원 소아청소년과에 내원하여 요로감염증으로 입원한 후 배뇨성 방광요도조영술을 시행하여 방광요관역류를 진단받은 83명의 소아를 대상으로 총 166 신단위를 후향적으로 분석하였다. 결과: 대상 소아 중 1세 미만의 평균 나이는 $3.1{\pm}2.56$개월이었고, 1세 이상의 평균 나이는 $58.9{\pm}43.01$개월이었다. 신초음파 이상소견을 보이는 신단위에서 방광요관역류가 있는 경우는 73.9%였고, 신초음파 정상소견을 보이는 신단위에서 방광요관역류가 있는 경우는 58.7%였으며 이는 통계적으로 유의한 차이를 보였다($P$=0.049). 로지스틱 회귀분석에서 신초음파 이상소견이 있을 경우 방광요관역류가 있을 확률은 약 2배 증가하였다. 방광요관역류가 있는 신단위에서 신초음파 정상소견을 보이는 경우는 52.8%, 피질음영증가 16.7%, 수신증 17.6%, 요관확장 8.3%, 수신증을 동반한 요관확장 1.9% 등이었다. 이 중 수신증(82.6%), 요관확장(100%), 중복요관(66.6%), 손상된 위축신(100 %)이 있는 경우 방광요관역류의 빈도가 상대적으로 높았다. 결론: 방광요관역류가 있는 신단위에서 신초음파 이상소견으로 방광요관역류의 중증도를 예측하는 것은 가능하지 않으나 방광요관역류의 존재를 예측하는 것은 가능하다. 그러므로 수신증, 요관확장 같은 신초음파 이상소견이 있을 시, 배뇨성 방광요도조영술의 시행이 필요할 것이다. Purpose: The aim of this study is to investigate the renal ultrasonographic findings in children with vesicoureteral reflux (VUR). Methods: We retrospectively reviewed the medical records of 83 patients who were diagnosed with VUR and underwent ultrasonography at Ilsan hospital between January 2000 and December 2010. Results: Among 166 renal units, 108 (65.0%) were found to have vesicoureteral reflux (VUR). Fifty-one (73.9%) had VUR in renal units with abnormal ultrasonography (USG), whereas 57 (58.7%) had VUR in renal units with normal USG. Abnormal USG findings were independent risk factors for VUR (Odds ratio, 1.98; 95% CI, 1.01-3.89; $P$=0.045). In renal units with VUR, the number of normal USG finding was 52.8%, and the abnormal findings were as follows; increased cortical echogenicity 16.7%, hydronephrosis 17.6%, megaureter or ureter dilatation 8.3%, hydronephrosis and ureter dilatation 1.9%, duplication of ureter 1.9%, and atrophic kidney 0.9%. The prevalence of VUR was relatively higher in renal units with hydronephrosis (23/19, 82.6%), ureter dilatation (9/9, 100%), duplication of ureter (2/3, 66.6%), and atrophic kidney (1/1, 100%). Conclusion: Our study indicates that VUR was associated with abnormal USG findings. When there are abnormal USG findings such as hydronephrosis, ureter dilatation, duplication of ureter, and atrophic kidney in children with UTI, VCUG is recommended to detect VUR after controlling UTI.

컴퓨팅 사고력 향상을 위한 PBL수업 연구

최민정(Choi Min Jeong),최수정(Choi Soo Jeong),백성혜(Paik Seoung-Hey),최희(Choi Hee) 한국교원대학교 융합교육연구소 2018 융합교육연구 Vol.4 No.2

4차 산업혁명 시대에 갖추어야 할 능력은 ‘문제 해결 능력’, ‘창의력’, ‘협업능력’ 이다. 이 역량들을 기르기 위해 최근 소프트웨어 교육이 주목 받고 있고 교육의 방법은 변화돼야할 필요가 있다. 이전에는 컴퓨터 소양 교육과 컴퓨터 활용 교육을 중심으로 교육이 이루어졌다면, 이제는 답이 주어진 문제를 가르치는 것이 아니라 스스로 창의력을 발휘 하여 문제를 해결할 수 있는 수업이 진행 되어야하는 것이다. 이러한 필요성에 따라 학생들이 능동적으로 프로그래밍 언어에 거리낌 없이 다가갈 수 있도록, 쉽고 재미있는 프로그래밍 수업 방식을 연구하는 것이 이 연구의 목적이다. 따라서 이 연구는 연구의 목적에 따라 A중학교와 B 고등학교를 선정하여 PBL을 반영한 정보교과를 지도하였고 수업 후 학생들의 흥미와 학습에 도움이 된 부분을 설문 조사 하였다. 그 결과 각 학교에서 수업을 받은 학생들은 전체적으로 학습에 대한 흥미와 동기에 긍정적인 영향이 있었다고 응답하였다. 또한 지식적인 측면에서도 도움이 되었다고 하였다. The ability to cope with the era of the fourth industrial revolution is problem solving ability , creativity and collaboration ability . To raise these competencies, software education is attracting attention recently, and the way of education needs to be changed. In the past, if education centered on computer literacy education and computer literacy education has been established, classes should be taught to solve problems by demonstrating creativity on their own, not by teaching the answers given. The purpose of this study is to investigate easy and fun programming methods so that students can actively approach the programming language according to their needs. Therefore, this study selected A middle school and B high school according to the purpose of the study and instructed the information curriculum reflecting the PBL. After the class, we surveyed the parts that helped students interest and learning. As a result, the students who took lessons in each school responded positively to the interest and motivation of learning as a whole. It was also helpful in terms of knowledge.

허혈성 급성신부전에서 TGF-β-induced gene product βig-h3의 변화와 초기 표지자로서의 의의

최민정 ( Min Jeong Choi ),박선희 ( Sun Hee Park ),김찬덕 ( Chan Duck Kim ),김용림 ( Yong Lim Kim ),권태환 ( Tae Hwan Kwon ),김인산 ( In San Kim ),김용진 ( Yong Jin Kim ) 대한신장학회 2007 Kidney Research and Clinical Practice Vol.26 No.3

Purpose : Acute renal failure remains a potentially devastating clinical problem. This study aimed to examine whether the expression of TGF-β-induced gene product, βig-h3, is altered in ischemiareperfusion (I/R) injury and urinary excretion of βig-h3 is changed in I/R injury. Methods : I/R injury was performed by clamping both renal arteries. Daily urine output, serum creatinine and urinary TGF-β and βig-h3 were measured after I/R injury. Also, the renal expression of βig-h3 by western blotting and immunohistochemistry were investigated. In the second step, urinary βig-h3 was measured at 4, 10, 16, and 24 hours after I/R injury to investigate whether it could be used as an early and sensitive marker for detecting I/R injury. Results : Urinary βig-h3 was significantly elevated at 24 hours and maintained higher than the controls until 2 days after I/R injury. In contrast, western blotting did not reveal any changes of βig-h3 expression. Immunohistochemistry showed that labeling of βig-h3 was seen at the basement membranes of proximal tubule cells mainly located at the medullary ray (S3 segment) in both groups. Following I/injury, the labeling was also seen in the basement membrane of injured or regenerated proximal tubular epithelial cells. Within 24 hours, urinary βig-h3 was significantly increased at 4 hours after I/R injury. Importantly, the urinary appearance of βig-h3 preceded that of N-acetyl-β-D-glucosaminidase. Conclusion : These results suggest that endogenous renal βig-h3 may serve to promote tissue regeneration in I/R injury and urinary βig-h3 could be used as an early and sensitive marker demonstrating I/R injury.

통계적 추정을 가르치기 위한 수학적 지식(MKT)의 분석

최민정 ( Choi Min Jeong ),이종학 ( Lee Jong Hak ),김원경 ( Kim Won Kyung ) 한국수학교육학회 2016 수학교육 Vol.55 No.3

Knowledge and data interpretation on statistical estimation was important to have statistical literacy that current curriculum was said not to satisfy. The author investigated mathematics teachers`` MKT on statistical estimation concerning interpretation of confidence interval by using questionnaire and interview. SMK of teachers`` confidence was limited to the area of textbooks to be difficult to interpret data of real life context. Most of teachers wrongly understood SMK of interpretation of confidence interval to have influence upon PCK making correction of students`` wrong concept. SMK of samples and sampling distribution that were basic concept of reliability and confidence interval cognized representation of samples rather exactly not to understand importance and value of not only variability but also size of the sample exactly, and not to cognize appropriateness and needs of each stage from sampling to confidence interval estimation to have great difficulty at proper teaching of statistical estimation. PCK that had teaching method had problem of a lot of misconception. MKT of sample and sampling distribution that interpreted confidence interval had almost no relation with teachers`` experience to require opportunity for development of teacher professionalism. Therefore, teachers were asked to estimate statistic and to get confidence interval and to understand concept of the sample and think much of not only relationship of each concept but also validity of estimated values, and to have knowledge enough to interpret data of real life contexts, and to think and discuss students`` concepts. So, textbooks should introduce actual concepts at real life context to make use of exact orthography and to let teachers be reeducated for development of professionalism.

20대 성인의 보행 후 휴식시간에 따른 진동식 자동혈압계와 수은혈압계의 안정혈압 도달 시점

최민정(Choi, Min-Jung),송경애(Sohng, Kyeong-Yae) 기본간호학회 2014 기본간호학회지 Vol.21 No.4

Purpose: The purpose of this study was to identify the time for young adults to reach resting blood pressure after walking as measured by an automatic and a mercury sphygmomanometer. Methods: Participants were 33 nursing students in their 20s. Blood pressure after walking was measured every minute on both arms simultaneously for a total of 6 times after walking for 12 minutes on a treadmill at ratings of perceived exertion (RPE) of 11. Data were analyzed using paired t-test, Bland-Altman plots and repeated measures ANOVA. Results: Systolic blood pressure after walking was the same as measurements corresponding to resting blood pressure after 3 minutes of resting if measured with the automatic sphygmomanometer and 4 minutes of resting if measured with the mercury sphygmomanometer. Conclusions: In order to measure the resting blood pressure for healthy young adults who performed low-density walking for 12 minutes on flat land, the measurement needs to be made after a resting time of at least 3 minutes in the case of an automatic sphygmomanometer and 4 minutes in the case of a mercury sphygmomanometer.

Dynamo를 이용한 벽 단열 성능 확인에 관한 연구 - 단위세대 모델을 이용한 BIM 설계사례를 중심으로-

최민정(Choi, Min-Jung),최현철(Choi, Hyun-Chul) 대한건축학회 2019 대한건축학회 학술발표대회 논문집 Vol.39 No.1

2-치환된 옥세테인의 합성

최민정 ( Min-jeong Choi ),이상협 ( Sang-hyeup Lee ) 대구가톨릭대학교 자연과학연구소 2018 자연과학연구논문집 Vol.16 No.1

The reaction of carbonyl compound with dimethyloxosulfonium methylide gives the isolable epoxide, which smoothly rearranges under thermal conditions to yield the four-membered cyclic ether. We now report on a convenient synthesis of 2-substituted derivatives, which the nucleophilic ring expansions of 2-mono- and 2,2-disubstituted epoxide with dimethyloxosulfonium methylide.

경력단절 여성베이비부머의 노동시장 복귀에 관한 분석

최민정 ( Choi Minjeong ) 한국사회복지정책학회 2017 사회복지정책 Vol.44 No.1

본 연구는 여성베이비부머의 노동시장 복귀 양상을 유형화하고 노동시장 특성, 인구학적 특성, 그리고 가구특성이 노동시장 복귀유형에 미치는 효과를 분석하는데 초점을 두었다. 이를 위해 경력단절 경험을 중심으로 여성베이비부머들의 노동시장 복귀에 관한 동태적인 분석을 행하고자 하였으며, 그 과정에서 사건배열분석(sequence analysis)을 통하여 고용상태 변화에 대한 체계적 이해의 구조를 마련하고자 하였다. 연구의 결과는 다음과 같다. 첫째, 교육수준에 따른 노동시장 복귀여부에 차이가 있었으며 대졸 이상 학력 여성들이 경력단절 경험 이후 노동시장에 복귀하지 않은 비율이 더 높았다. 둘째, 사건 배열분석을 통해 노동시장 복귀형태를 유형화한 결과 상용직 경력유지형, 지속적 경단 후 불안정노동형, 자영업 이후 미취업형, 지속적 무급가족종사자형, 장기미취업형의 다섯 가지 유형으로 분류되었다. 셋째, 다항로짓분석을 통해 노동시장 복귀 유형에 영향을 미치는 사회경제적 요인을 탐색한 결과 교육년수, 배우자 소득, 초산연령, 출산 전 직종 등이 노동시장 복귀유형에 유의미한 영향을 미쳤다. 이러한 연구결과에 기초하여 본 연구는 여성베이비부머의 노동시장 복귀의 대표적인 양상을 제시하고 유형에 따른 특성 차이를 보여줌으로써 노동시장 복귀유형별 고용지원 강화, 중고령 여성 적합 직종 발굴 및 일자리 창출, 고용지속을 위한 사후관리의 강화 등을 제안하였다. This study purpose was conduct a dynamic analysis of career interrupted female baby boomer`s return to the workforce through sequence analysis. And this study tracks 14 years after the career interruption. This study based investigation on the data complied by the KLIPS, where the workforce performance is the focal point of it`s research. The findings of study were follows. First, according to the study, years of education is a vital factor in female baby boomer`s return to the workforce. Second, sequence analysis produced 5 groups - continuous regular employment, continuous career interrupted after precarious employment, business owner and unpaid family worker, precarious employment after unemployment, and continuous unemployment. Last, result of multinominal logistic regression results that pre-career interrupted job family was a permanent employment larger than continuous career interrupted after precarious employment, business owner and unpaid family worker relatively continuous unemployment. Therefore, this study suggests enlargement of employment policy for prevent female baby boomer`s poverty and social exclusion.