• The Journal of the Convergence on Culture Technology
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• v.10 no.2
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• pp.237-244
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• 2024

We studied the effects on their academic achievement of chemistry II and advanced chemistry subjects of science high school students according to the type of class (face-to-face and non-face-to-face). The subjects of this study were 195 first-year students of G Science High School located in Gyeongnam. The average scores of Chemistry II and Advanced Chemistry in non-face-to-face classes in 2020 and face-to-face classes in 2021 were compared and analyzed. As a result of comparing and analyzing the academic achievement according to the class type, students' grades in Chemistry II and Advanced Chemistry were higher in non-face-to-face classes. In the comparison of academic achievement by level according to class type, Chemistry II showed higher average grades in non-face-to-face classes as the lower level were, and in advanced chemistry, the higher the upper grades in non-face-to-face classes. In addition, in terms of the effect of changes in class form on the upper and lower 10% levels of academic achievement of Chemistry II, the upper 10% showed high grades in face-to-face classes and the lower 10% in non-face-to-face classes. On the other hand, in advanced chemistry, the average grade of non-face-to-face classes was higher than that of face-to-face classes in the top 10%, and the average grade of face-to-face classes was higher than that of non-face-to-face classes in the bottom 10%. Through these results, it was found that in the teaching-learning of science high school students, instructors need to design and treat teaching-learning appropriate to the level of academic achievement.

• Journal of the Korean Chemical Society
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• v.66 no.3
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• pp.243-250
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• 2022

The purpose of this study was to investigate the inscription of North Korean Higher-Level Middle School 1 chemistry textbooks in the era of North Korean leader Kim Jong-un to understand North Korean chemistry education. The types and functions of inscription for each unit of the North Korean Higher-Level Middle School 1 Chemistry textbook were analyzed and compared with the inscription of the 'Chemistry I' textbook in South Korea. Inscriptions were analyzed by constructing an analysis frame based on previous studies. The analysis results were as follows. First, as for the types of inscription used in North Korean textbooks, photographs and illustrations were used the most, and graphs were used the least. Second, the functions of inscription used in North Korean textbooks had many exploratory and exemplary functions, and decorative functions were used the least. Third, there was no significant difference in type and function of textbook inscriptions from North and South Korea. The results of this study may be helpful in understanding North Korean chemistry education.

• Proceedings of the Korean Society of Dyers and Finishers Conference
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• 2011.11a
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• pp.58-58
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• 2011

현 의류 섬유산업의 트렌드는 친환경, 무공해, 인체친화, 고감성, 고급스러움 등을 표현할 수 있는 제품으로의 전환이 이루어지고 있으며, 최근 부드럽고, 편안하고, 모던한 특징 및 내추럴한 느낌을 나타내는 천연섬유에 대한 요구가 더욱 늘어나고 있다. 양모 섬유는 천염섬유 중 많은 비중을 차지하고 있는 단백질 섬유로서, 이를 이용한 다양한 직물과 의류제품은 국내외적으로 유명 브랜드 바이어와 지속적으로 내수와 수출이 이루어지는 대표적 섬유이다. 그러나 양모 소재에 특유의 구조와 형태로 소재간 섬도차로 인해 고급섬유에의 복합시 물리적, 감성적 이질감으로 상품화가 제한되고 있으며, 소비자 및 바이어들은 기존 보다 더욱 부드러운 고급감의 양모소재를 선호하고 있다. 이에 천염섬유 중에서도 세섬도 생산의 한계가 있는 양모섬유에 대해 양모섬유의 끝단을 마이크로 분활화 및 세섬화를 가능하게 함으로서 새로운 고감성 및 고급감을 부여할 수 있을 것이며, 본 연구에서는 산 및 초음파 등의 물리화학적 분할 기술을 적용하여 부분적 피브릴화 세섬화된 양모소재에 대한 염가공 특성을 기존 양모소재와 비교 함으로서 개질 양모소재의 제품화 실용성 여부를 검토하였다.

• Journal of the Korean Chemical Society
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• v.63 no.4
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• pp.266-279
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• 2019

The purpose of this study was to investigate the inquiry tendency of North Korean chemistry textbook by Romey's method. We analyzed the inquiry tendencies of texts, figures, questions, activities, and summaries by Romey's method. And the following results were compared with those of previous South Korean studies, which method was the same. The 20,017 texts, 541 figures, 140 questions, 243 activities, and 25 summaries in 5 chapters of chemistry textbook of the Higher-level middle school 1 in the Kim Jong-Un Era were analyzed. Results were as follows: texts were authoritarian tendency, figures were authoritarian tendency, questions were excessive inquiry tendency, activities were inquiry tendency, and chapter summaries were drastic authoritarian tendency. The inquiry tendency of North Korean chemistry textbook in higherlevel middle school showed similar tendencies as the textbooks of South Korean chemistry I textbook in the 6th National Science Curriculum. The results of this study are expected to be utilized as basic information and data to understand the inquiry teaching that North Korea science education is aiming at.

• Proceedings of the Korean Institute of Industrial Safety Conference
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• 2003.05a
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• pp.39-42
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• 2003

현대의 화학공장에서는 소비자의 요구를 충족시키기 위한 생산품 생산 및 제품의 고급화, 규격화 등으로 인하여 공정 및 설비가 더욱 복잡해지고, 공정운전조건이 세분화됨으로써 고온, 고압에서 사용·취급·저장되는 유해화학물질의 특성으로 인하여 대규모의 잠재 위험성이 증가하는 현실이다.(중략)

• Applied Chemistry for Engineering
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• v.4 no.2
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• pp.423-431
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• 1993

Long chain alcohols, the mixtures of 1-hexadecanol/1-octadecanol, were used as cosurfactants for O/W emulsion prepared with glycerol monostearate/POE(100) monostearate mixed nonionic surfactants, and the phase behavior and flow properties of O/W emulsions were observed. The transition temperature of long chain alcohol was varied with the composition of 1-hexadecanol/1-octadecanol and had the lowest value when the mixed ratio of 1-hexadecanol/1-octadecanol was 2/1. The liquid crystalline phase was formed as the addition of long chain alcohol and the secondry droplet, the flocculate of the emulsion particles, was made, and thus the viscosity of the emulsion was increased. When the temperature of emulsion system was under the transition temperature of long chain alcohol, the mobility of hydrocarbon group of long chain alcohol was restricted, and thus gel structure was formed and the viscosity of the the O/W emulsion was increased, but along with the time, the liquid crystalline phase was disappeared and the viscosity of emulsion was decreased. Long chain alcohol/nonionic surfactants/water formed the liquid crystalline phase when the long chain alcohol was added above the saturation point of solution(2 wt% in this experoment), and the secondry droplet didn't formed when the long chain alcohol was added more than a certain amount (10 wt% in this experiment).

• Product Safety
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• s.209
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• pp.52-57
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• 2011

일본 동북지방에서 발생한 대지진으로 일본경제뿐 아니라 세계경제 및 국제금융시장에서의 불확실성이 높아지고 있다. 부품소재 강국인 일본 주력산업에 피해가 발생하면서 글로벌 분업 네트워크에 대한 충격이 우려되는 상황이다. 각종 전자부품, 첨단소재 산업의 겨우 고급차질이 장기화되면 부정적 영향이 확대될 것으로 보이며, 석유화학제품은 수급불안과 가격 상승이 불가피할 것으로 판단된다.

• Journal of Energy Engineering
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• v.1 no.1
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• pp.53-57
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• 1992

지난 여름 우리는 하루 최대 전력소비량을 매일 갱신하는 무더위를 겪었다. 이처럼 근래들어 에너지위기라느니 에너지 고갈이라느니 하는 말이 심심찮게 들릴 정도로 에너지가 부족한 실정이다. 그만큼 에너지의 소비가 늘고 절대량이 부족한 것이다. 이는 인구가 증가하고 생활, 문화가 고급화되면서 소비가 늘었기 때문이지만 기술의 발달이 수요를 따를 만큼의 에너지를 공급해주지 못하기 때문이다. 그래서 발전소가 건설되고 있다. 그러나 몇몇 보고서에는 에너지 사용의 효율성이 떨어지기 때문이라는 지적도 있다. (중략)

• Ecology and Resilient Infrastructure
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• v.3 no.4
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• pp.256-262
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• 2016

Rapid industrialization and a significant population growth has led to an increased use of chemicals, which has limited the biological processes that account for most of the existing water and wastewater treatment methods. Ozone microbubble technology, which is one of advanced oxidation processes, has recently attracted attention as a method to solve these issues. In this paper, we reviewed both the physical and the chemical characteristics of microbubbles, and evaluated microbubble-based ozone oxidation processes focusing on the removal of various toxic contaminants. In addition, we discussed the potential of an ozone microbubble process as water and wastewater treatment processes by combining it with other treatment technologies.

• Proceedings of the Korean Environmental Sciences Society Conference
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• 2006.05a
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• pp.365-369
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• 2006

[ $O_3$ ]/catalyst를 이용한 고급산화공정에서 pH변화에 따른 1,4-dioxane의 화학적 분해 특성을 알아보기 위해 이 실험을 수행하였다. 초기 pH를 6, 8, 10으로 조절하여 변화를 보면 오존의 pH 완충효과에 의해 시간이 지남에 따라 알칼리와 산의 경우 중성 쪽으로 중화되는 것을 확인하였다. 그리고 시간에 따른 1,4-dioxane의 제거율은 pH 10 > pH 8 > pH 6 의 순서로 나타는 것을 보였다. 이는 오존이 산성에서는 안정하지만 알칼리성에서는 불안정함으로 인해 자기분해를 일으켜 OH라디칼의 생성을 촉진시켜 제거율이 높게 나타났다. 초기 pH를 조절한 실험, 초기 pH를 일정하게 유지한 실험에서의 50분 후의 최종 제거율은 비슷하였지만, 초기 pH를 일정하게 유지한 실험에서 제거율이 꾸준히 감소하는 것을 알 수 있었다.