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禹榮均,崔錫源,卞相國 공주대학교 사범대학 과학교육연구소 1992 과학교육연구 Vol.23 No.1
Most of the fluorite ore deposits in Kumsan district occur in the Chinsan area. Specifically, these are the Okgye, Hyongyang, Ilyang, Manak fluorite ore deposits. Field survey and fluid inclusion study were undertaken to illustrate the characters and origin of the fluorite ore deposits in Chinsan area. The results of this study are as follows; Gology of the Chinsan area is composed of Majonri Formation and Changri Fomation which belong to Okchon Group and Jurassic biotite granite and Cretaceous pink feldspar granite and quartz porphyry. The wall rock of fluorite ore deposits in Chinsan area are chiefly limestone in Majonri Formation and partly limestone in Changri Formation. The relevent igneous rocks of the fluorite ore deposits are chiefly quartz porphyry, but some are biotite granite or pinkfeldspar granite. The fluorite ore deposits in this area are chiefly contact metasomatic deposits which were formed while limestones were intruded by quartz porphyry, biotite granite and pink feldspar granite. The filling degrees of fluid inclusions in fluorite ranges 84∼95% in Okgye, 85∼95% in Hyongyang, 85∼91% in Ilyang, 92∼96% in Manak ore deposits. The salinity (NaCl equivalent weight percent) ranges 0.1∼1.5wt.% in Hyongyang. 0.3∼2.8wt.% in Ilyang. 0∼1.5wt.% in Manak ore deposits. The homogenization temperature of fluorite ore deposits in Chinsan area ranges 97.6∼191.6C in Okgye, 99∼168.4C in Hyongyang. 100∼214C in Ilyang, 122∼248.6C in Okgye, 99∼168.4C in Hyongyang, 100∼214C in Ilyang, 122∼248.6C in Manak ore deposits. These data indicate that Chinsan Fluorite ore deposits belong to the epithemal or mesothemal deposits same as the other fluorite ore deposits in Korea.
전동익,오화석,이상철,변상균,박종승,강민영,이승우,Cheon, Dong-Ik,Oh, Hwa-Suk,Lee, Sangchul,Byun, Sang-Kyun,Park, Jong-Seung,Kang, Min-Young,Rhee, Seung-Woo 항공우주시스템공학회 2007 항공우주시스템공학회지 Vol.1 No.4
Labyrinth seal is most common way to protect the bearings installed in Reaction wheel. In spite of wide applications, no such research was found about the sealing utility of the Labyrinth seal in the condition of vacuum and high temperature. In this research, we tried to verify the utility of Labyrinth seal. Numerical analysis had been executed to predict the benefit of the Labyrinth seal and also experiments were performed to verify the utilization. Two Bearings were installed at the vacuum chamber, one was assembled with Labyrinth seal and the other was stand alone. After executing the vacuum test, it was found to be the stand alone bearing had lost more weight than the one that was assembled with the labyrinth seal. In this result, it is verified that the Labyrinth seal has useful function to preserve the lubricant that affects to the life-cycle of the Bearing.
Functional foods with antiviral activity
김다현,김재환,김다현,조재영,변상균 한국식품과학회 2022 Food Science and Biotechnology Vol.31 No.5
Viruses are known to cause a variety of diseases, ranging from mild respiratory diseases, such as the common cold, to fatal illnesses. Although the development of vaccines and targeted drugs have significantly improved the mortality rate and disease severity against a number of viral infections, there are still many viruses without proper treatment/prevention options and newly emerging viruses can pose serious health threats. For instance, the coronavirus disease 2019 (COVID-19) pandemic is producing significant healthcare and socio-economic burden worldwide, which may jeopardize the lives and livelihoods for years to come. Studies have identified functional foods with antiviral activity. Certain foods may target the viral life cycle or modulate the host immune system to enhance defense against viral infections. In this review, we will discuss some of the food products reported to display protective effects against viruses including the influenza virus, human immunodeficiency virus, and severe acute respiratory syndrome coronavirus 2.
Molecular targets of exercise mimetics and their natural activators
Young Jin Jang,변상균 생화학분자생물학회 2021 BMB Reports Vol.54 No.12
Physical exercise can be effective in preventing or amelioratingvarious diseases, including diabetes, cardiovascular diseases,neurodegenerative diseases, and cancer. However, not everyonemay be able to participate in exercise due to illnesses, age-relatedfrailty, or difficulty in long-term behavior change. Analternative option is to utilize pharmacological interventions thatmimic the positive effects of exercise training. Recent studieshave identified signaling pathways associated with the benefitsof physical activity and discovered exercise mimetics that canpartially simulate the systemic impact of exercise. This reviewdescribes the molecular targets for exercise mimetics and theireffect on skeletal muscle and other tissues. We will also discussthe potential advantages of using natural products as a multitargetingagent for mimicking the health-promoting effects ofexercise.