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이광춘,정선국,정선용,조영태,박정훈,Li, Guang-Chun,Jung, Sun-Kook,Chung, Seon-Yong,Jo, Young-Tae,Park, Jeong-Hun 한국지하수토양환경학회 2011 지하수토양환경 Vol.16 No.3
The experimental studies for remediation of diesel contaminated soils were performed using subcritical water in laboratory scale. Contaminated soils from industrial area and artificially contaminated soils were utilized for soil remediation. Experimental system was composed for subcritical water to flow upward through the soil packed column for extracting contaminants. 10 g of contaminated soil was packed into the column and water flow rate was 2 mL/min. To evaluate the effects of temperature, pressure and treatment time on the removal efficiency, temperature was changed from 100$^{\circ}C$ to 350$^{\circ}C$, pressure from 50 bar to 220 bar and treatment time at the predetermined temperature from 0 min to 120 min. The purification efficiency increased as temperature increased. However, the effect of pressure and treatment time was low. Temperature 250$^{\circ}C$, pressure 50 bar and treatment time 30 min were selected for optimal operating condition for this study.
의성소익지(義城小益地) 신동층군(新洞層群)의 퇴적암석학(堆積岩石學) 및 퇴적환경(堆積環境)
이광춘,Lee, Kwang-Choon 대한자원환경지질학회 1985 자원환경지질 Vol.18 No.3
Sedimentary petrology and depositional environments of the Sindong Group, consisting of in ascending order the Nagdong, Hasandong and Jinju Formations, in the Euiseong Subbasin are studied. For these, the Sindong sequence over 1,000m thick is measured at the scale of 1:200 and 36 thin sections of sandstones of the Hasandong Formation are studied under the polarizing microscope. In addition, published paleontologic data are incorporated in the sedimentologic interpretation. Most of the sandstones are classified as arkose. They are moderately sorted, near symmetrical to fine skewed and mesokurtic. Relationship between the textural parameters suggests a fluviatile environment of the Hasandong Formation. The Sindong fauna and flora also indicate non-marine depositional environments. Sedimentologic data of the measured sections show that the Sindong Group is made up of from the bottom an alluvial fan (lower part of the Nagdong Formation), a fluvial plain (upper part of the Nagdong Formation and the Hasandong Formation) and a fluvial/lacustrine (the Jinju Formation) deposits.
이광춘,이지숙,김경환,박준석,신동운,김훈,박준민,김현종,신희준,전우찬 대한응급의학회 2017 大韓應急醫學會誌 Vol.28 No.4
Purpose: Falling is one of the most common causes of injury for preschool children. Here, we aim to identify the characteristics and risk factors of injuries by falling-down in preschool children. Methods: Between January 2010 and December 2011, we enrolled patients under the age of 7 years, who were injured by falling down and visited an urban regional emergency center. We retrospectively surveyed the medical record of these patients, including age, sex, place and height of fall, type of floor, guardian’s witness, traumatic brain injury (TBI), and fracture of extremities. Results: The odds ratios sex (male), age (under 2 years old), height of fall, type of floor (hard), and guardian’s witness (presence) that resulted in TBI were 1.35 (95% confidence interval [Cl], 0.72?2.55; p=0.352), 3.83 (95% Cl, 1.78?8.65; p<0.05), 6.38 (95% Cl, 3.27-12.44;p<0.05), 3.58 (95% Cl, 0.47-27.30; p=0.218), and 1.47 (95% Cl, 0.63-3.43; p=0.377), respectively. The odds ratios sex (male), age (over 2 years old), height of fall, type of floor (soft), and guardian’s witness (absence) that resulted in fractures were 1.19 (95% Cl, 0.78-1.81; p=0.433), 3.10 (95%Cl, 1.99-4.84; p<0.05), 1.98 (95%Cl, 1.19-3.29; p<0.05), 2.41 (95% Cl, 1.29-4.54; p<0.05), and 1.15 (95%Cl, 0.72-1.85, p=0.554), respectively. Conclusion: In preschool children who experienced an injury from falling down, TBI was increased with younger patients and higher height of fall, but it was not related with patient’s sex, type of floor, and guardian’s witness; conversely, fractures were increased with older patients, higher height of fall, and soft floor, but not related with patient’s sex and guardian’s witness.
이광춘,주용우 한국디지털융합학회 2020 디지털경영연구 Vol.6 No.2
Machines have been used simply for arithmetic operations and documentation. However, with the development of technology, a new generation of artificial intelligence has begun. Machines are not just tools that can be calculated, but they have been commercialized in various fields, such as natural language processing technology that can understand and communicate human language, or video fields, where human dependence was high. Since 2016, the AI game, “Alphago,” has defeated Lee Se-dol with a significant difference in skill, interest in AI has increased sharply. Machines have started to replace human jobs because of their excellent performance, low cost and competitive edge. In this paper, I would like to present a plan on how to use artificial intelligence to affect human jobs and how to improve productivity effectively by cooperating with machines and humans in the future.