• Journal of The Korean Association of Information Education
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• v.21 no.2
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• pp.183-190
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• 2017

This study is for analyzing the effect of smart blended instructional strategy in history class. The effectiveness of this strategy is set as students' academic achievement and learning interest. This study is applied to elementary school students who participated in history class by classifying the experiment group with smart blended instructional strategy and the comparison group with traditional teaching method. As a result of the t-test, the smart blended instructional strategy positively affected the students' academic achievement and learning interest. Through the qualitative analysis, the students' understanding of the class is improved and the concentration is also improved.

• Archives of design research
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• v.9
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• pp.1101-1114
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• 1994

As of today-half a century has passed after 1945, the liberation from Japanese imperialism-it's significant to introspect our culture. On the one hand our culture has succeeded due to the peculiar history, but on the other hand it hasn't. So to speak, it has gained in Quantity but lost in Quality. There are keen, international competition and exchange in the modern culture. So the Qualitive success of modern design depends on if it had an original character or not. According to Korean rapid industrialization, technological extence, and economic growth, the export has increased greatly, but package design hasn't been match for them. Korean expoters have been meeting with cutthroat competition in world market. Under these circumstances it's very important that we have a real understand and interest in our culture, we strengthen the competitive power of home products with good package design. This is our age of not home market but world market. We live in an age when design wins, so that we have to develop the good design native to Korea. Many designers have proposed their opinions with the characteristic designs, but it has been only a fragmentary and passive method. We must seek for the new method more positively. The effective and proper method resolves itself into the following four points. First, to understand Korean history and culture. Second, to have the exact grip of this economic situation. Third, to promote the national emotion. Fourth, in conclusion, to accord the package design with them. We cannot put off this task to overcome the cultural subordination, to place Korea on a firm cultural basis in the world, and to contribute to the cultural exchange of package design. First, to understand Korean history and culture. Second, to have the exact grip of this economic situation. Third, to promote the national emotion. Fourth, in conclusion, to accord the package design with them. We cannot put off this task to overcome the cultural subordination, to place Korea on a firm cultural basis in the world, and to contribute to the cultural exchange of package design.

• Proceedings of the Korean Society of Propulsion Engineers Conference
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• 2009.05a
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• pp.18-21
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• 2009

The life of components under high thermal load is typically shorter than other components. The turbopump turbine of liquid rocket is operated under these environments like high temperature and high centrifugal dorce due to high rotating velocity during operating time. These conditions may often cause low-cycle fatigue problem in the turbopump turbine. First of all, to analyze heat stress, ABAQUS/CAE is used and Coffin-manson's equation is used to consider elasticity and plasticity strain. S.W.T's method is used to consider the mean stress effect, using strain history, low-cycle fatigue analysis is done for turbopump turbine which may have FCL(fracture critical location). In this paper, strain life method is applied to analyze low-cycle fatigue.

• Korean Journal of Heritage: History & Science
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• v.45 no.4
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• pp.92-103
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• 2012

The Cheomsungdae was built in the Silla dynasty during the reign of queen Seondeok. It has a round cylindrical structure with a flowing curved fa ade. The identity of the Cheomsungdae has not been revealed since there is not much historical evidence or documents about the building. This study is trying to investigate the building technique and method from the technical point of view of the past when it was constructed. There have been much work and studies done for the Cheomsungdae, but not much were focusing on the technical aspects of the building. In addition there are many questions and doubts about the hypothesis of the building technique of Cheomsungdae since there aren't any remaining documents or historical evidence supporting it. Among many questions, we think that the discussion on falsework technique is not considering traditional construction method of the Dujabee (a traditional construction technique using various tools and equipment for the stability of the building) technique. Therefore, it is hard to identify them as reliable historical facts. As the result of the study, we want to provide the basic data on the construction techniques of Korean traditional architecture and broaden the study scope of technical history by narrowing the errors. The study could be summarized into three points. 1. The historical architecture Cheomseongdae was constructed by using traditional crane techniques such as a Noklo (pulley ladder). Cheomseongdae was re-evaluated as a high level technology for the history of architecture. 2. The benchmark method on Cheomseongdae construction has been applied with a precise scientific method based on the geometrical principals using the central axis. 3. In terms of the history of Korean traditional architecture technology, as there aren't many studies done we proposed various basic data for the traditional crane techniques and criteria of Korean traditional architecture technology. We could expect various and active studies for the technical approach of the history of architecture.

• Nuclear Engineering and Technology
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• v.30 no.2
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• pp.91-98
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• 1998

Time history analysis is usually performed to characterize the nonlinear seismic behavior of a spent fuel storage rack(SFSR). In the past, the seismic analyses of the SFSR were performed with two-dimensional planar models, which could not account for torsional response and simultaneous multi-directional seismic input In this study, three-dimensional seismic analysis methodology is developed for the single SFSR using the ANSYS code. The 3D- Model can be used to determine the nonlinear behavior of the rack, i.e., sliding, uplifting, and impact evaluation between the fuel assembly and rack, and rack and the pool wall, This paper also reviews the 3-D modeling of the SFSR and the adequacy of the ANSYS for the seismic analysis. AS a result of the adquacy study, the method of ANSYS transient analysis with acceleration time history is suitable for the seismic analysis of highly nonlinear structure such as an SFSR but it isn't appropriate to use displacement time history of seismic input.

• The Journal of Korean Medicine Ophthalmology and Otolaryngology and Dermatology
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• v.22 no.2
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• pp.163-175
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• 2009

Objective : The aim of this study was to take a census of elementary school children who have atopic dermatitis(AD) especially the residents of Je-Cheon. Method : We conducted a questionnaire survey of the elementary school children in Je-Cheon who have atopic dermatitis. 96 patients with AD were involved in the survey. The questionnaire was made up of their family history, past history, weaning food, breast-fed or not, dietary treatment and Children's Dermatology Life Quality Index(CDLQI), etc. The student's T-test was used for statistical analysis. Results : Parents and siblings brothers and sisters past history has an effect on patients with AD. With regard to past history of patients, allergic rhinitis was the most common ailment. Formula feeding was common in the group under 6 months of age and the mean age of the start of weaning was 7.25 months. Fruit juice and weaning food of powder type were the first weaning foods in this study. Many parents introduced a grain diet, live diet, bone - soup, egg, milk, cheese and bean curd to their children under 12 months of age. A restricted diet was the most common dietary treatment method in this study. The highest scoring question for CDLQI was itching; the lowest one was related to bullying. Conclusion : We analyzed the patients' family history, past history, weaning food, dietary treatment and Children's Dermatology Life Quality Index(CDLQI), etc. Through this survey, we better understand the actual conditions of elementary school children who had AD in Je-Cheon.

• Clean Technology
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• v.23 no.3
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• pp.325-330
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• 2017

This study presents the preparation of n-tetradecane-in-water emulsions with different weight ratios of n-tetradecane and water, and their potential application in packaging and shipping vaccines. The size and distribution of the n-tetradecane droplets are characterized using optical microscopy and light scattering methods, respectively. The thermal properties of the emulsions are determined using the T-history method. In the results, the emulsions, which are comprised of 17 ~ 30 wt% oil, 3 wt% surfactant, and 67 ~ 80 wt% water, are stable and have droplet sizes in the range of 100 to 800 nm. The thermal properties demonstrate that subcooling is prevented through increasing the droplet size. The results indicate that the n-tetradecane/water emulsions containing 25 ~ 35 wt% n-tetradecane, with a melting point of $2{\sim}8^{\circ}C$ and a latent heat of $227.0{\sim}250.8kJ\;kg^{-1}$, are good candidate materials for packaging and shipping vaccines.

• Journal of Korean Medical classics
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• v.21 no.3
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• pp.127-145
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• 2008

We have known that "Chimgudaeseong(鍼灸大成)" had been written by Yanggyeju(楊繼洲) in Myeong(明) Dynasty. And it had been the only text book of acupuncture & moxibustion for 300 years. This book is composed of 10 chapters dealing almost all the medical theories of that times. This book is so enormous that it is hard to understand essential ideas of author. The reading medical records is one of the best way to develop one's abilities of curing a disease without clinical practice. so we can't help dealing with medical records, because it is one of important method of understanding Oriental Medicine. On this study, we investigate a objective method on understanding medical records in "Chimgudaeseong(鍼灸大成)".

• Journal of Korean Medical classics
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• v.21 no.4
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• pp.13-28
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• 2008

We have known that "Chimgudaeseong(鍼灸大成)" had been written by Yanggyeju(楊繼洲) in Ming(明) dynasty. And it had been the only text book of acupuncture & moxibustion for 300 years. This book is composed of 10 chapters dealing almost all the medical theories of that times. This book is so enormous that it is hard to understand essential ideas of author. The reading medical records is one of the best way to develop one's abilities of curing a disease without clinical practice. so we can't help dealing with medical records, because it is one of important method of understanding Oriental Medicine. On this study, we investigate a objective method on understanding medical records in "Chimgudaeseong(鍼灸大成)".

• Korean Journal of Air-Conditioning and Refrigeration Engineering
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• v.15 no.7
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• pp.604-610
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• 2003

Cycle test for developed phase change material (PCM) is necessary in order to analyze the variation of latent heat, which decreases with time by deterioration. 7-history method and measurement using heat flux meter are appropriate for the cycle test in a tube filled with PCM because they do not need an extraction of sample in measuring the heat of fusion. In the present study, these methods were applied to a PCM having a melting point below a room temperature, different from the past studies for PCMs melting above a room temperature. As a result of experiment using pure water as specimen, we can obtain reason-able values for heat of fusion by both methods.