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Settling and Filtering Processes for Treatment of Fine Suspended Solidsand Soluble Heavy Metals
Minah Oh(오민아),Wonki Kim(김원기),Seungjin Oh(오승진),Dukmin Kim(김덕민),SangHoon Lee(이상훈),Jai-Young Lee(이재영) 한국지반신소재학회 2013 한국토목섬유학회 학술발표회 Vol.2013 No.11
Fine suspended solids and heavy metals generated effluence from mine drainage could destroy environment as the aesthetic landscapes, and depreciate water quality. Therefore, the purpose of this research is focused on process development applied the actual field for controlling fine suspended solids and heavy metals, and so lab-scale test was performed for inducement of basic data. The mine drainage used in this research was sampled in H. mine located Jeongseon-gun, Gangwon-do. Concentration of suspended soil, arsenic, iron and manganese was exceeded the standard of contaminant limitation for the clean water, and particle size of suspended solid was less than 10 μm as fine particle. Although hydraulic retention time of mine drainage for effective settling was required more than 6 hours, hydraulic retention time would be increased in winter season when the settling efficiency could be reduced because of viscosity decreasing. Moreover, installed inclination plate helped to increase settling efficiency of suspended solid about 30 %. Filtering media that was the most effective removal of suspended solids and heavy metal was indicated granular activated carbon of 1~2 mm was the optimal size.
The Feasibility Study on SRF with Inclusion of Bulky Waste and Disposable Plastic Bags
( Minah Oh ),( Hee-sung Moon ),( Woori Cho ),( Won-duck Chung ),( Jai-young Lee ) 한국폐기물자원순환학회(구 한국폐기물학회) 2015 한국폐기물자원순환학회 3RINCs초록집 Vol.2015 No.-
In this study, we applied a modified SRF product quality based on a mix of disposable plastic bags and inclusion of bulky waste to estimate the mixing ratio which can be the energy efficiency of coal for fuel. Physical properties of inclusion of bulky waste, element analysis when mixing for disposable plastic bag, SRF were analyzed. As a result, as the physical properties, Woods is 83.6%. Inclusion of bulky waste : disposable plastic bag mix ratio [3:7], [5:5], [7:3] were both satisfied with the quality criteria. The low calorific value was proportionally increased when disposable plastic bag mixing ratio increase. Therefore, disposable plastic bag mixing ratio of [6: 4] is similar of coal for fuel value of 5,950 kcal / kg.
The Biodiesel Production with Food Waste and Sewage Sludge
( Minah Oh ),( Jai-young Lee ) 한국폐기물자원순환학회(구 한국폐기물학회) 2019 ISSE 초록집 Vol.2019 No.-
The purpose of this study is to produce biodiesel using food waste and sewage sludge. The produced biodiesel is evaluated for its availability and sustainability as the fuel. The yield of biodiesel can be determined by the lipid and content of the total glycerides within the raw materials. An experiment was conducted to derive the optimum mixing ratio between food waste and sewage slud ge to obtain the maximum content of biodiesel. The optimum mixing ratio was selected to 50% of food waste and 50% of sewage sludge as mass content with dry basis. The catalyst condition for the highest yield of fatty acid methyl ester in biodiesel was 2% sulfuric acid under 60℃ during 8 hours. In addition, the optimum condition for extraction solvent was determined 60% of metha nol with 40% of n-hexane, and the ratio of solvent to sample(the lipid from food waste and sewage sludge) was selected 15:1 (v: v). The yield of fatty acid methyl ester (FAME) in produced biodiesel was analyzed 95.46% under the optimum condition. There are 2 kinds of method to produce biodiesel; 2-step method is performed lipid extraction and methylation separately, while 1-step method is performed simultaneously. Biodiesel produced in both methods had the major components with palmitic acid (C16:1) a nd oleic acid (C18:1n9c). However, the yield of FAME in biodiesel produced 2-step method was higher than 1-step method. Mor eover, the biodiesel produced in the 2-step method met most fuel quality criteria. Thus, it is appropriate to use the 2-step method t o produce biodiesel, which is high purity and can be used as fuel.
( Minah Jon ),( Jae-jun Shim ),( Shin Ju Oh ),( In Zoo Choi ),( Chi Hyuck Oh ),( Byung-ho Kim ) 대한간학회 2018 춘·추계 학술대회 (KASL) Vol.2018 No.1
Aims: Abdominal ultrasonography (US) and alpha-fetoprotein (AFP) testing are components of the nationwide liver cancer surveillance program in South Korea. However, whether this surveillance strategy improves the detection rate of single and small (< 2 cm) hepatocellular carcinoma (HCC) in high-risk groups is unclear. Methods: We investigated the detection process and the clinical features of small HCC in a single healthcare center in South Korea from 2006 to 2015. Surveillance comprised US and AFP screening every 6 to 12 months; computed tomography (CT) was performed in place of US at the discretion of the clinician. Results: During the study period, 916 patients were newly diagnosed with HCC, of whom 91 (9.9%) had a small HCC. The proportion of small HCC was 9.5% from 2006 to 2010 and 10.4% from 2011 to 2015 (P=0.677). The proportion of small HCC did not increase significantly during the 10-year period (Figure, P for trend = 0.297). The majority of patients with small HCC were detected by surveillance (N=57, 62.6%), followed by screening (N=14, 15.4%), and incidentally (N=20, 22.0%). Between 2006 to 2010 and 2011 to 2015, 65.2% and 60.0%, respectively, of small HCCs were detected by surveillance (P for trend=0.609). CT scan detected the largest proportion of small HCCs (45.1%), followed by US (40.7%), AFP elevation (12.1%), and magnetic resonance imaging (MRI) (2.2%). The overall 1-, 3-, and 5-year survival rates of treated patients were 96.0%, 84.6%, and 79.8%, respectively. Transarterial chemoembolization (TACE) was the most commonly performed initial treatment (N=46, 50.5%), due to an unfavorable tumor location or decreased liver function. Surgical resection and ablation were performed in 11 (12.1%) and 26 (28.6%) patients, respectively. However, there was no significant difference in the overall survival rate between patients who underwent surgical resection and those subjected to surgical ablation (P=0.295 by log-rank test). Conclusions: Surveillance plays a major role in early detection of HCC. However, the current surveillance strategy is inadequate for the detection of small HCC in cirrhotic patients; more effective and practical surveillance strategies are needed.
고등교육 경험이 학습역량에 미치는 영향: S대학의 사례를 중심으로
오민아(Minah Oh),전홍식(Hongsik J. Cheon) 한국경영교육학회 2020 경영교육연구 Vol.35 No.5
[연구목적] 본 연구는 S대학의 학습역량 분석을 바탕으로 데이터 기반의 고등교육 성과관리 방향성을 탐색하고자 하였다. [연구방법] 학습역량 척도를 S대학의 교육성과 진단도구로 장기적으로 활용할 수 있는지 살펴보고자 신뢰도와 타당도를 검증하였고 다집단 확인적 요인분석을 수행하여 측정의 동일성을 검증하였다. 이후 학습역량의 변화를 살펴보고자 총 9개의 가설을 도출하였고 이를 검증하기 위하여 일원변량분석, 내재된 이원변량분석 및 기술통계 분석을 수행하였다. [연구결과] S대학 학습역량 진단도구의 측정의 동일성이 확보되었다. S대학 재학생은 학년이 올라갈수록 학습역량이 전반적으로 상승하였고 모든 학년의 학습역량이 시간이 지날수록 높아지는 경향성을 나타냈다. 전공계열에 따라 학습역량 성장 수준이 차별적으로 나타났다. [연구의 시사점] 본 연구의 가장 큰 의의는 적절한 데이터를 통하여 대학교육의 질 관리를 실증적으로 검증할 수 있으며 이를 위한 시스템 구축이 필요함을 밝혔다는 데 있다. [Purpose] The purpose of this study was to explore the direction of data - based higher education’s quality management by analyzing the level of learning competency focusing on the case of S university. [Methodology] In order to examine the learning competency scale could be used as a diagnostic tool for educational outcomes of S university over the long term, we examined reliability and validity of the scale and performed multi-group confirmatory factor analysis to verify the invariance of the measurement. Nine hypotheses were built to analyze change of the learning competency and one-way variance analysis, nested two-way variance analysis and descriptive statistics were performed. [Findings] As a result of the study, the measurement invariance of the scale was confirmed. The level of learning competency increased overall as the grade goes up and every grade’s learning competency increased as time goes on. According to the major, the level of learning competency’s change differed. [Implications] This study revealed that the effectiveness of higher education’s quality management could be verified empirically through appropriate data, and that it is necessary to establish a system for this.