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주다영,이준규 한국응용언어학회 2022 응용 언어학 Vol.38 No.3
Although performance assessment has been widely used in English education in Korea, scant attention has been focused on the validation of the assessment, especially on the one that targets young language learners. In this regard, the purpose of this study was to validate an L2 speaking performance assessment for elementary school EFL learners, adopting many-facet Rasch measurement (MFRM) as an analytical tool. The validation focused on examinees’ behaviors, to offer an assessment validity argument as to if the result of the assessment can be considered accurate. While it was found that examinees were evaluated relatively accurately, probability curves of rating scales revealed that examinees were not separated appropriately from the current 4-level rating scale, indicating that 2-level to 3-level distinctions would better describe examinees’ achievement. Interaction analyses between Examinee✕Task and Examinee✕Rating Scale showed that examinees displayed irregular patterns when the task comprised question forms and when they were evaluated in terms of delivery of the speech. The findings of the study provide valuable information to teachers as well as researchers, on the design and interpretation of performance assessments.
Acid Mine Drainage Treatment by Potential Carbon Mineralization : A Step Toward a Circular Economy
주다영,Van Duc Nguyen,이상희,Chungkook Lee,Eundon Jeon,Thenepalli Thriveni,Mohd Danish Khan,안지환 한국에너지학회 2022 에너지공학 Vol.31 No.3
Acid Mine drainage is produced mainly from the two sources such as mineral and mining industries and there are a factors to enhance the AMD formation: i) atmospheric moisture, ii) pH, iii)temperature, and iv) surface area of sulfide minerals exposed to the oxygen. Acid Mine Drainage (AMD) is formed with the outflow of extremely acidic water from the mine dumps or abandoned mine sites, which contains the dissolved heavy metals such as Copper (Cu), Lead (Pb), Mercury (Hg), Nickel (Ni), Arsenic (As), Cobalt (Co), Cadmium (Cd), and other some common metals are Manganese (Mn), Iron (Fe), and Zinc (Zn). AMD is a major pollutant that causes a severe threat to the aquatic and ecosystem. There are a few major issues associated with this AMD including contamination of drinking water, lowering the reproduction growth rate of plants and aquatic animals, etc. In this paper, we discussed a new technical solution carbon mineralization technology for the treatment of acid mine drainage, and also promoting the possible circular economy was proposed. A carbon mineralization technology was studied for the stabilization of heavy metals in soil and ashes as well as hardness removal of water. The proposed carbon mineralization is an alternative technical solution for the treatment of AMD which leads the AMD wastewater to be a resource to achieve a circular economy.