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A Study of Simple α Source Preparation Using a Micro-coprecipitation Method
Myungho Lee,Tae-Hong Park,BYUNG CHUL SONG,Jong Ho Park,KYUSEOK SONG 대한화학회 2012 Bulletin of the Korean Chemical Society Vol.33 No.11
This study presents a rapid and simple α source preparation method for a radioactive waste sample. The recovery of 239Pu, 232U and 243Am using a micro-coprecipitation method was over 95%. The α-peak resolution of Pu and Am isotopes through the micro-coprecipitation method is enough to discriminate the Pu and Am isotopes from other Pu and Am isotopes. The determination of the Pu and Am isotopes using the microcoprecipitation method was applied to the radioactive waste sample, so that the activity concentrations of the Pu and Am isotopes using the micro-coprecipitation method in the radioactive waste sample were similar to those using the electrodeposition method.
잠재집단분석을 활용한 일반계 고등학교 학교 향상도 변화 유형화 및 영향요인 검증
정송(Song Jung),신명호(Myungho Shin),이영리(Young Ri Lee) 한국교육평가학회 2015 교육평가연구 Vol.28 No.5
본 연구는 일반계 고등학교의 학교 향상도 변화 유형에 따른 잠재집단을 교과별로 도출하고 분류의 영향요인을 검증하고자 수행되었다. 분석 결과, 국어에서는 ‘저수준집단’,‘유지집단’, ‘고수준집단’의 3개 잠재집단이, 수학과 영어에서는 ‘저수준집단’과 ‘고수준집단’의 2개 잠재집단이 확인되었다. 영향 요인 검증 결과, 국어는 학교 성별, 학교 유형,학교 풍토가, 수학과 영어는 학교 성별, 학교 유형, 학교 풍토, 학교생활 행복도가 잠재집단 분류에 유의한 영향을 미치는 것으로 나타났다. 학교 성별의 경우 교과별로 상이한 양상을 보였다. 반면 모든 교과에서 사립학교와 학교 풍토가 좋을수록 높은 향상도를 유지할 확률이 높았다. 심리적응도와 교육환경만족도로 구성된 학교생활 행복도는 요인에 따라 효과의 형태가 다르게 나타났다. 학생들이 높은 심리적응도 수준을 보이는 학교일수록 매해 기대되는 점수보다 실제 성취 점수가 낮은 집단에 속할 가능성이 높았다. 반면 교육환경만족도 수준이 높을수록 그렇지 않은 학교에 비해 매해 기대되는 점수보다 실제 성취 점수가 높은 집단에 속할 가능성이 높았다. 본 연구의 결과는 학교 교육의 효과성을 효율적으로 높일 수 있는 정책 수립 과정에 도움을 줄 수 있을 것이다. ‘School Achievement Improvement’ refers to the index for evaluating accountability of school education and presents information on the degree to which students’ academic achievement can be enhanced by the efforts which a school puts into its students when encompassing all components related to school education. The purposes of the present study were to identify the latent classes of School Achievement Improvement change for 4 consecutive years by 3 subjects, Korean, Math, English, and to test its determinants including school gender, school type, school region, teacher-specific schooling climate, degree of happiness of school life. According to the results, ‘high-level class’, ‘stay-level class’, and ‘low-level class’ were identified in Korean while ‘high-level class’ and ‘low-level class’ were discerned in Math and English. Even though the significant determinants of the classification were distinctively different among the subjects, school type and teacher-specific schooling climate are analyzed to influence the classification across the subjects, indicating that private schools and schools with positive teacher-specific schooling climate have high possibility to belong to the high-level class. In Math and English, psychological adaptation and educational environment satisfaction which consisting of the degree of happiness of school life showed contrasting effect. Schools with high psychological adaptation are likely to fall into the low-level class while there is high chance of being the high-level class to schools with high educational environment satisfaction. Based on findings from this study, it is recommended that the influential factors affecting the classification should be taken into account in school-education-related decision making processes to maximize school accountability for students’ academic achievement.
김문수,송명호 동국대학교 산업기술연구원 2000 산업기술논문집 Vol.11 No.2
An experimental study on the extrusion process of paraffin has been conducted as a step to understand the relations between extrusion parameters and the productivity of polypropylene wood flour composite extrusion process. The emphasis was made on the influence of extrusion pressure, temperature and cooling conditions upon phase change characteristics and the occurrences of extrusion defects. The polypropylene wood flour composite is a promising material with a number of applications in construction, furniture, machinery parts and etc., as it combines the excellent texture of natural wood and the continuous manufacturing potence of plastics. Besides, it is near waterproof and soundproof, is made with wood waste and recycled plastics, and thus, environment friendly. Paraffin was used as an analogy material for polypropylene since it is a thermoplastic polymer, has a lower phase change temperature, and is transparent in liquid state, which enables the flow visualization by shadowgraph diagnostics. The extrusion speed and the cooling conditions as well as the temperature of paraffin melt at the entrance of the cooling section were varied, while the pressure of the melt and the temperature distribution along the cooling surface were measured as the experimental results. When the cooling is not sufficient or the extrusion speed is too large the melt rupture occurred through the gap between the solidified paraffin and the cooling surface. Precautions needed for the design of extrusion apparatus are described.
Solving a Fuzzy Linear Programming Problem with Triangular Membership Function
Se-Ho Oh,Myungho Lee,Wooyoung Song 중소기업융합학회 2015 중소기업융합학회 국제학술대회논문집 Vol.2 No.1
The fuzzy linear programming is the decision making model containing vague and subjective parameters. This paper deals with the objective and the right hand side whose values are fuzzy numbers. The objective value is defuzzified by the piecewise linear function and the right hand side fuzzy numbers are defined by the triangular membership functions. Each of these triangular functions is split into two piecewise linear functions. Then the given fuzzy linear programming problem is transformed into the symmetric model suggested by Zimmermann. Consequently the solution based on the max-min rule is obtained by solving the conventional linear programming problem derived from the symmetric model.