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그룹활동을 통한 의사소통능력 신장 연구 : 과제수행 중 상호작용을 중심으로 Focusing on the Interaction in Task based Classes
이정자 국제한국어교육학회 2001 한국어 교육 Vol.12 No.2
Group activity is an interactive classroom activity which aims at interpreting, negotiating, and collaborating in the target language. The activity is widely conducted in a language teaching and learning classroom because it is highly effective in a task-based and meaning-centered communicative environment. The critical factor for the successful interaction lies in the variables in the authentic classroom. The paper is the result of the factual proving study on the interactive influence and interactive modification of Chinese students in the Korean language classroom through two types of task-based activities, one is the required information exchange task and the other is optional information exchange task. The study result shows that more interaction and interactive modifications are produced in the first type than the second one. It also shows that the theme of the task plays an important role in the group activity. The paper also studies the characteristics of Chinese students in interactive activities and the role of teachers in it as well as some of the study methods related.
이정자,이문득 한국화학공학회 1971 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.9 No.2
Solutions of magnesium bicarbonate have been prepared by leaching magnesium hydroxide and carbonate trihydrate and calcined dolomite suspensions with carbon dioxide at about one atmosphere. The metastable solutions of magnesium bicarbonate can not be formed from the carbonate but can be only from the existence of the hydroxide suspensions. At the experiment, to form metastable solution is needed the [OH^-] is 0.1 Mol/liter at flow rate of CO₂ about 33 ㎖/min. and 20-50℃. Absorption mechanism in this system may be represented by the following; the hydroxide ion reacts with dissolved carbon dioxide to give bicarbonate ion. Then metastable solution breaks down by the precipitation of pillar crystalline magnesium carbonate trihydrate by the reaction between bicarbonate and hydroxyl ions at the solid-liquid interface. As the absorption proceeds, the carbonate is converted to bicarbonate.
이정자 서원대학교 예술문화연구소 1998 예술문화논총 Vol.7 No.-
The most important thing in the piano playing is that the students play piano repeatedly and continuously with interest on piano exercises. Thus, my aim and purpose of the study is to present further rudiments of music in logical order, step by step, with gradual and steady progress. Also the study provides appealing melodious pieces for the students to play and to keep these pieces with the range of their ability so that they may be played fluently and artistically. Furthermore, it provides writen work in the form of musical games that will stimulate interest and further theoretical musical knowledge. On the other hand, it is very important that players do fingers exercises every day repeapedly before they go to work. The fingers exercises help developing strong hands and flexible fingers. A course is mastered, another course is given to players for exercises, then another should be added. When the pedal is used correetly. it can make music sound more beautiful. The pedal on the right(called the damper pedal) is the one the students use very often in the playing piano. The pedal is used by the right foot. The ball of the foot should rest on the pedal. The heel of the right foot should be on the floor as the players press the pedal down, and as players release the pedal. The player's heel acts as a hinge as the player's foot press down and lift up.
Ethanol - 물 혼합용매에서 KCI 의 분몰랄부피 및 점도에 관한 연구
이정자,이문득,이익춘 한국화학공학회 1973 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.11 No.3
염화칼륨의 ethanol-물 혼합용매에서의 분몰랄부피 및 상대점도를 30, 35 및 40℃에서, 몰랄농도 0.01<m<0.16범위안에서 측정하여 그 결과로 분몰랄부피 및 Jones-Dole식으로 점도계수 B값을 구하고 또 염화칼륨의 점성흐름에 대한 효과를 활성화에너지 및 앤트로피의 입장에서 전해질의 전하효과와 알코올혼합으로 인한 물구조의 변화를 해석해본 결과 염화칼륨은 물의 수소결합을 약화시키는 structure breaking효과를 가진다는 것을 알았다. Apparent moral volumes and relative viscosity of potassium chloride in ethanol-water mixtures have been determined at 30, 35, and 40℃ in the molal concentration range 0.01<m<0.16. The results are discussed in terms of partial molal volumes, viscosity B-coefficients calculated from the Jones-Dole equation, and energy and entropy of activation for viscous flow. Potassium chloride was found to be a structure breaker.