methods of feedback and advantages for each respective method. For our study, our group decided to focus on the comparison among certain feedback methods to come to a potential conclusion on which can be the most effective for L2 learners. The questions which this paper seeks to answer are as follows: Does negative feedback have an impact on acquiring L2 skills, and between the use of echo questi
method?
Hypothesis
Negative feedback does have a positive impact on L2 learning.
18 Korea University students with varying levels of English skills and of different majors
Age: 20~23 years old
L1: Korean, L2: English
studied English only in Korea
usually started learning English in elementary school
on average, learned L2 for 10 to 15 years
asked to self-evaluate
method
- 원리
모두 구리이온(cupric ion-Cu2+ 과 cupurous ion- Cu+)을 이용하는 방법이다. Folin 시약(Lowry 방법)과 BCA시약은 발색반응을 위해 cupric ion에서 cupurous ion으로 환원반응이 일어 나야 한다. 이들시약은 단백질 양에 비례하여 형성된 cupurousion과 단백질의 복합체를 형성하고 그 발색정도가 단백질 농도에