• Journal of The Korean Association For Science Education
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• 제25권1호
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• pp.16-25
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• 2005

Minute papers are brief papers written at the end of a lecture in response to one or two questions posed by the instructor. The answers are discussed briefly at the beginning of the next lecture. We used minute papers to follow students' understanding and response to lecture demonstrations in an introductory general chemistry course. An analysis of these minute papers suggest that the following characteristics are important, when using demonstrations as teaching aids. 1) The purpose of a demonstration should be stated as explicitly as possible. 2) Instructors should be explicit about what is happening and what students should be looking for. 3) Demonstrations should be kept as simple as possible, perhaps illustrating one concept. Finally, we note that students believe that the visual component of demonstrations enhances their comprehension of chemistry concepts.

• Journal of Navigation and Port Research
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• 제43권6호
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• pp.361-368
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• 2019

Aid to Navigation (AtoN) is the artificial facilities to facilitate the ship's safe navigation using light, shape, color, sound, and radio waves. IALA has developed and operated the educational course for expert groups for the design, deployment, and management of AtoN. Also, maritime educational institutes have operated various educational courses for safe navigation through the ship's operation and ECDIS curriculum for seafarers. However, education using the AtoN Simulator System is needed to prevent marine accidents caused by misunderstanding of the AtoN according to various topographical, environmental, and maritime traffic environments. In this study, the existing ship handling simulator and AtoN simulator were applied to develop educational modules for accurate understanding and application of AtoN in various environments, enhancing the quality of education from the existing theoretical point of view and improving practical use to maximize educational efforts.

• Journal of Ginseng Research
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• 제45권1호
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• pp.58-65
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• 2021

Background: Panax ginseng, as one of the most widely used herbal medicines worldwide, has been studied comprehensively in terms of the chemical components and pharmacology. The proteins from ginseng are also of great importance for both nutrition value and the mechanism of secondary metabolites. However, the proteomic studies are less reported in the absence of the genome information. With the completion of ginseng genome sequencing, the proteome profiling has become available for the functional study of ginseng protein components. Methods: We optimized the protein extraction process systematically by using SDS-PAGE and one-dimensional liquid chromatography mass spectrometry. The extracted proteins were then analyzed by two-dimensional chromatography separation and cutting-edge mass spectrometry technique. Results: A total of 2,732 and 3,608 proteins were identified from ginseng root and cauline leaf, respectively, which was the largest data set reported so far. Only around 50% protein overlapped between the cauline leaf and root tissue parts because of the function assignment for plant growing. Further gene ontology and KEGG pathway revealed the distinguish difference between ginseng root and leaf, which accounts for the photosynthesis and metabolic process. With in-deep analysis of functional proteins related to ginsenoside synthesis, we interestingly found the cytochrome P450 and UDP-glycosyltransferase expression extensively in cauline leaf but not in the root, indicating that the post glucoside synthesis of ginsenosides might be carried out when growing and then transported to the root at withering. Conclusion: The systematically proteome analysis of Panax ginseng will provide us comprehensive understanding of ginsenoside synthesis and guidance for artificial cultivation.

• Journal of The Korean Association of Information Education
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• 제11권1호
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• pp.59-66
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• 2007

This study is aimed at developing a curriculum in relation to programming learning by using robot, for it has been judged as a scientific learning tool to help elementary school children as well as gifted children among them improve their creativity. Based on this concept, teaching aids and materials were developed, and then applied to the locale of education, and results therefrom were analyzed ccordingly. Curriculum and contents of teaching aids were classified into two processes, i.e. the assembling process of robot to fit the varied problematic situations and the programming process (all six phases), and edited so much as to entice elementary school children to get interests and attentions to robot and programming by compiling the contents to suit their level of learning. Results from the evaluation of the application of robot education curriculum to the locale for learning revealed that it was a positive teaching tool that helped children improve their creativity. Also conclusions were derived from the analysis and evaluation that several aspects should be complemented as for teaching and learning tool to achieve the objective of excellence education.

• International Journal of Automotive Technology
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• 제8권4호
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• pp.395-402
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• 2007

Homogeneous Charge Compression Ignition (HCCI) shows great potential for low $NO_x$ emission but is hampered by the problem of no direct method to control the combustion process. Therefore, HCCI combustion becomes unstable easily, especially at lower and higher engine load. This paper presents a method to achieve diesel-fueled HCCI combustion, which involves directly injecting diesel fuel into the cylinder before the piston arrives at top dead center in the exhaust stroke and adjusting the valve overlap duration to trap more high temperature residual gas in the cylinder. The combustion stability of diesel-fueled HCCI combustion and the effects of engine load, speed, and valve overlap on it are the main points of investigation. The results show that: diesel-fueled HCCI combustion has two-stage heat release rate (low temperature and high temperature heat release) and very low $NO_x$ emission, combustion stability of the HCCI engine is worse at lower load because of misfire and at higher load because of knock, the increase in engine speed aids combustion stability at lower load because the heat loss is reduced, and increasing negative valve overlap can increase in-cylinder temperature which aids combustion stability at lower load but harms it at higher load.

• Journal of Korean Academy of Fundamentals of Nursing
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• 제12권3호
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• pp.413-420
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• 2005

Purpose: The purpose of this study is to identify health risk behaviors in adolescents according to grade in school and to of for basic data to develop a health promotion for adolescents. Methods: A descriptive survey design was used and the SPSS 12.0 program was used for the data analysis, which included Chi-square test and Spearman correlation coefficients. The instrument for this study was based on the 1999 Youth Risk Behavior Surveillance System developed by the Centers for Disease Control and Prevention. Results: The results indicate that adolescent have an average of 2 risk behaviors out of 10 health risk behaviors categories. There are various types of risk behaviors, which art: different for each grade, such as physical fights, using alcohol, using heroin, weight control, and the lack of AIDS education. Physical fights, and the lack of AIDS education are common in the 9th grade, using alcohol, heroin, and weight control are common in the 11th grade. Physical fights were correlated with using cigarettes and sexual intercourses. Using alcohol was correlated with using cigarettes, heroin, sexual intercourses and weight controls. Using heroin was correlated with sexual intercourse and weight control. Conclusion: For the promotion of health in adolescents, different approaches to health education and prevention of health risk are needed for each grade because the health risk behaviors differ between grades.

• Journal of Preventive Medicine and Public Health
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• 제37권3호
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• pp.220-224
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• 2004

Objectives : To investigate the sexual behavioral characteristics and HIV/AIDS knowledge among men who have sex with men(MSM), one of the HIV high risk groups. Methods : A three month survey among individuals who were able to be contacted was carried out over the entire Republic of Korea, between May and August, 2001. 348 individuals completed a self-administered question-naire. The data collected included demographic informa-tion, sexual behavior and AIDS knowledge. Results : Eighty-seven and ninety-two per cent of the 348 MSM were aged 20-39 years and had never been married, respectively. Fifty-five per cent of participants reported at least one sexual contact with women, and a quarter of the MSM surveyed had engaged in high-risk sexual behavior (more than 6 partners) during the previous year. About twenty per cent of the MSM had anal sex as their favorite way of having sex, and seventy-four per cent did not use condoms regularly due to loss of enjoyment, and were more likely to be engaged in risky behaviors. Only ten per cent had a regular HIV test history, and most had obtained knowledge or information on HIV/AIDS through the mass media. Conclusions : A large proportion of the MSM in Korea still remain at an elevated risk for contracting HIV infection. Change in high-risk sexual behaviors will prevent the spread of HIV infection among the MSM population, which requires public health education for preventive interventions, and should be culturally and socially specific in order to be effective.

• Korean Journal of Health Education and Promotion
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• 제14권1호
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• pp.125-145
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• 1997

Over the last several decades, the debates on school sexuality education program have centered on the specific education topics and its in-depth to be taught for different level of students. Many people, on the whole, worried that sexuality education for the adolescents promote irresponsible sexuality activities and that students become more liberal following sex education(in all ways, not just sexually). At the present time, however, most social leaders agree that school sexuality education program should be developed and implemented as an important part of the formal school curriculum. Because they believe that sexuality education programs will be effective to change irresponsible sexual behavior and prevent sexual risk among teenagers. Researches demonstrate that not all school-based sexuality and AIDS education programs are effective, but that some programs are effective. On the basis of previous studies, the present paper reviewed the beliefs and questions which generate discussion and opposition to sexuality education program at the school. The effectiveness of the educational instruction was also evaluated focused on the reducing specific sexual risk behavior and reinforcement of individual values against sexuality activities. Lastly, this paper proposed several ways and means for effective sexuality education program in general.

• Journal of Elementary Mathematics Education in Korea
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• 제13권1호
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• pp.75-95
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• 2009

The purpose of the study was to investigate the scaffolding processes of children in mathematical problem solving. 3 groups of 4th grade students participated in the study and the researchers proceeded the study for 4 months. The procedures of this research were as followings. First, when the learners solved the problems, the categories of scaffolding processes(by way of unit line coding belong in open codings, the categories were made 25 concepts and integrated 20 subcategories) were produced the 7 results: invite to the learning, set the problems, affective aids, attempt self learning, re-ordering between learners and affirmation self learning. Second, the processes of scaffolding in mathematic problem solving resulted in condition, the present condition, action/interaction and the outcomes. Third, the cognitive and affective aids that discovered in the scaffolding processes were considered the main categories of learner's scaffolding processes in solving the mathematic problems. In conclusion, first, the learners' scaffolding processes, based on Vygotsky's "the zone of proximal development" in selection and presentation of mathematic problems, are very diverse. Peers' affective aids are very important in solving the problems. Second, learners in the scaffolding processes exchange the cognitive and affective aids with each other with joy and earnestness, and the aids can give assistance to all the participants. Third, in the results of observation and analysis in learners' scaffolding processes, it is meaningful to know how they think. Finally, the learners' scaffolding processes are a little unsystematic and illogical compared to those of adults, but those of scaffolders are so similar to those of learners' cognitive and affective systems that they can provide teachers with many merits in understanding and teaching learners.

• The Journal of Korean Society for School & Community Health Education
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• 제9권1호
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• pp.63-83
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• 2008

Objectives: This study was to examine HIV/AIDS knowledge of transmission, attitudes toward homosexuals on stigma of HIV/AIDS and discriminatory attitudes towards person with HIV/AIDS (PWHAs) by middle and high school students in Seoul, Korea. Methods: The population of this study is middle and high school students in Seoul, Korea. Eight junior high schools and eight senior high schools were selected randomly. Three thousand and one hundred thirty-one students (1704 males and 1397 males) from 16 schools participated in the survey, and 2.977 cases were analyzed. A self-administered questionnaire measuring socio-demographic variables, HIV/AIDS knowledge of transmission, sigma of HIV/AIDS (3 items, 5-point Likert-type scale) and discriminatory attitudes PWHAs (5 items, 5-point Likert-type scale) was utilized. The Structural Equation Modeling was employed to investigate the research Model. Results: The empirical study shows that a number of statistical hypotheses are significant. The stigma and discriminatory attitudes PWHAs were significantly different by middle and high school students. The attitudes toward homosexuals and HIV/AIDS knowledge of transmission were important factors on stigma and discriminatory attitudes PWHAs. Socio-demographical variables such as sex was related to the stigma and discriminatory attitudes PWHAs. Conclusion: Therefore, it is important to design HIV prevention strategies that increase in positive attitudes towards PWHAs.