• The Mathematical Education
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• v.57 no.2
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• pp.75-92
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• 2018

Based on Perceptions about Mathematics Teachers (PMT) perceived by high school students, measured by 2189 students from Seoul Educational Longitudinal Study 2014 (SELS 2014), latent profile analysis (LPA) identified five distinct types of student groups (positive, partial positive, middle, negative, extreme negative). These student of positive, middle, and negative groups are positive, moderate and negative perceptions about math teachers. Partial positive group generally had a positive perception about mathematics teachers, extremely negative group was very negative about mathematics teachers. Both of these groups had peculiarly inconsistent trends and several anomalies. The Multinomial logistic regression analyses also indicated that individual factors (gender, major, self-concept, resilience, self-assessment, career maturity), school factors (friendship, relationship with school teachers) and parental factors (academic-relationship, emotional-relationship) were significant predictors of PMT profile groups. The Analysis of variance also indicated that mathematics class (attitude, satisfaction and atmosphere), Mathematics achievement were significant predictors of PMT profile groups. The profiling of perceptions about mathematics teachers resulted in enhanced understanding of the complex range of processes students employed. During mathematics class, implementation of smooth interactions and communications between students and teachers added in the teaching and learning of mathematics.

• Computers and Concrete
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• v.24 no.5
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• pp.453-458
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• 2019

Today, concrete remains the most important, durable, and reliable material that has been used in the construction sector, making it the most commonly used material after water. However, cement continues to exert many negative effects on the environment, including the production of carbon dioxide (CO2), which pollutes the atmosphere. Cement production is costly, and it also consumes energy and natural non- renewable resources, which are critical for sustainability. These factors represent the motivation for researchers to examine the various alternatives that can reduce the effects on the environment, natural resources, and energy consumption and enhance the mechanical properties of concrete. Geopolymer is one alternative that has been investigated; this can be produced using aluminosilicate materials such as low calcium (class F) FA, Ultra-Fine GGBS, and high calcium FA (class C, which are available worldwide as industrial, agricultural byproducts.). It has a high percentage of silica and alumina, which react with alkaline solution (activators). Aluminosilicate gel, which forms as a result of this reaction, is an effective binding material for the concrete. This paper presents an up-to-date review regarding the important engineering properties of geopolymer formed by FA and slag binders; the findings demonstrate that this type of geopolymer could be an adequate alternative to ordinary Portland cement (OPC). Due to the significant positive mechanical properties of slag-FA geopolymer cements and their positive effects on the environment, it represents a material that could potentially be used in the construction industry.

• Journal of The Korean Association For Science Education
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• v.34 no.1
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• pp.10-20
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• 2014

This study compares the perceptions of elementary gifted child and science teacher in a science class for the gifted. In order to explore the research problem, students and teachers answered a written semi-structured questionnaire and participated in interviews regarding the gifted science class. The data was collected and analyzed. Science teachers recognized the characteristics of a good science class, especially in terms of educational content and teaching methodology. First, they suggested promoting inquiry skills, presenting a challenging task in atypical topic selection, student-centered curriculum, and controlling the pace of learning to recognize individual differences. Second, in terms of the science class skills and attitudes category, teachers recommended raising mutual satisfaction through vigorous interaction within a permissible atmosphere. Finally, science teachers need to strive for continued professional growth. Gifted children, meanwhile, want to investigate a wide range of topics without time constraints. Additionally, they may have to explore challenging topics further. They prefer to act like scientists in that they enjoy group activities, communication and cooperation. In particular, they want to be evaluated by others in a totally embedded assessment. Gifted children also expect teachers to understand the life circumstances and needs of the students. In addition, they asked for teachers to respect individual experiments and to show them how to safely use new equipment or research methods. As a result, gifted children and science teachers have to recognize the differences of opinion concerning a good science class for the gifted. This study can help formulate strategies to establish quality management of materials in gifted science classes.

• The Korean Journal of Elementary Counseling
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• v.8 no.1
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• pp.95-107
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• 2009

The purpose of this study was to investigate the effect of social skill training on the class cohesiveness of Elementary School students. The experimental group received 12 times of the social skills training for 6 week period. And each training session which lasted for 40 minutes took place twice a week. A total of 59 5th grade students in randomly selected two classes of D Elementary School in N. Gyongsang participated in this study. They were divided into the two groups, again at random; an experimental group(N=30, Male=18, Female=12) and a control group(N=29, Male=15, Female=14). In this study, the class cohesiveness performance test reorganized into 20 items for the level of elementary students by Shin-suk Gang, was applied, after complemented. And, the collected data were analysed through SPSS 14.0. T-test was applied to find out the difference of the average between the experimental group and the control group and the average difference in the pre-and post-test of the experimental group alone, and to see whether the control group and the experimental group are homogeneous. The research design of this study is pre-and post-test control group design. The result of this study is as follows: The result of Independent t-test and Paried t-test on the cohesiveness score and sub-factor scores tells us that the experimental group which received the social skills training showed better achievement that deserves our attention compared to the control group. This result suggests that student's class cohesiveness(class atmosphere, mutual trust, morale, a sense of unity, communication) is positively affected by the social skill training. Accordingly, social skill training which develops class cohesiveness can be an effective strategy for elementary school students to make them more intimate and cooperative with their classmates.

• Journal of Korean Elementary Science Education
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• v.40 no.3
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• pp.311-325
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• 2021

Modern society demands a new science teacher image. Compared to other school ages, elementary school students are the time when the teacher's influence plays a large role and is the time when they first encounter science subjects. The role of science teachers is very important as the starting point for the initial image of science learning and attitudes toward science by elementary science teachers. Therefore, it is very important to correctly establish an image of an elementary science teacher. The purpose of this study is to analyze the images of science teachers that elementary school students prefer and avoid according to their class situation. To this end, 534 elementary school students were divided into five classes: class type, class material presentation method, subject instruction method, subject content explanation method, and class atmosphere, and the image of science teacher who prefers and avoids is described in an open format. Concepts presented by elementary school students were analyzed using Semantic network analysis. The conclusions of this study are as follows. First, the image of a science teacher preferred or avoided by elementary school students was determined according to how the science teacher did the class. Second, elementary school students prefer activity-oriented classes such as experimental classes, and there is a need for classes to be conducted in this manner. Lastly, small changes and efforts of teachers in teaching methods are needed so that changes to science classes preferred by elementary school students can be achieved.

• Journal of Service Research and Studies
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• v.4 no.2
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• pp.11-19
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• 2014

This study simulates cases with 20, 30, 40, 50, 60 and 100 students and 6 values as the parameter of mu. Using the simulation, an analysis was made of how the number of students that couldn't concentrate during class increased over the duration of time. When normalizing the difference in student number when the value of mu is constant, there was a decrease in percentage over time. It also showed a change in percentage when the value of time is fixed while the value of mu changes. Based on the result values, by estimating the mu value with the class atmosphere to predict the outcome and improve the lecture.

• 대한공업교육학회지
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• v.40 no.2
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• pp.22-43
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• 2015

The purpose of this study was to analyze students' expectation for specialized subjects teacher's role of technical high school. The study was carried out through questionnaire survey method. A survey questionnaire was developed by researcher to collect the information needed for the study. It consists of 15 items. 428 questionnaires were used for analysis. A chi squared test was used for data analysis. Major findings of this study were as follows: First, when specialized subjects teachers lecture major theory subject classes, students of technical high school wanted it to be according to their level. Their practical class preference differed depending on their department. For the security guidance method during practical class, students most wanted teachers constantly instructing in class. Second, students of technical high school wanted their teachers to pay attention to personality guidance during student life guidance & counseling time. They hoped that teachers would not discriminate towards wrong doings. Also students wanted career the most as a counseling topic and expected a guidance role from teachers. Third, students of technical high school wanted teachers to work hard to create a harmonious class atmosphere when managing a class. They wanted teachers to have affection for class and students. They wanted teachers making jokes easily with students to get friendly. Fourth, students of technical high school hoped 'employment and entrance higher grade school' the most as a career guidance topic. They wanted teachers to consider their aptitude when they were counseling about finding a job and wanted to learn more about job information during employment instructions.

• Journal of the Korean Society of Food Culture
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• v.7 no.2
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• pp.91-96
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• 1992

Eight hundred college students in Seoul area were surveyed for consumer behaviors and opinions about fast food restaurants at library, student center and class room from August 26 to 30, 1991. The result of this study showed that 70% of college students preferred to eat hamberger or chicken and 49% of them visited to fast food restaurants 1-3 times per month. The reasons given by students for patronizing fast food restaurants were the following, from most to least frequence: 'convenient', 'pleasant atmosphere', 'nice place to stay with friends', 'taste of food', 'speed of service', 'to be able to stay as long as I want', 'hygiene', 'variety of food price', 'nutritious food'. Majority of college students(71%) selected their food by preference, but 22% of them done by price. They were least satisfied with price and quantity of fast food. Therefore, it is important to develop domestic brand fast food restaurants to lower the price of fast food.

• Korean Institute of Interior Design Journal
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• no.34
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• pp.124-131
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• 2002

Lighting is the single most important part of the design of a retail store. Good lighting can enhance a product's appearance, accentuate a special display, balance the visual elements of a store, and create the proper mood. In shops the lighting is required to draw the customer's attention to the goods help him to appraise them, and provide an atmosphere conducive to sales. The method will vary according to the types of good displayed, the form of trading, the design of the shop, and the class of customers expected. For the all reason, this study is focused on how the lighting design effects the customer's interest to the goods and intended to prescribe the possibilities of effective lighting design.

• Journal of the Korean School Mathematics Society
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• v.1 no.1
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• pp.47-57
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• 1998

This thesis is a research to develop mathematical problems related to every day life, and to apply to mathematical extracurricular activity. The conclusions are as followings; (1) The materials of mathematical extracurricular activity totaling 34 hours' class time were developed and its theaching methods were thought out. (2) Through studying the mathematical problems related to everyday life, we could create a lively atmosphere in the classroom. (3) Through studying the mathematical problems related to everyday life, we could change the learning attitude of students affirmatively and make the students solve the problems for themselves. (4) We could try to build up to the management of mathematical extracurricular activity.