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국내외 초등학교 영어 교과서에 나타난 2015 개정 영어과 교육과정 의사소통 기능의 사용 분포 비교
노원준,신동광,이용상 융합영어영문학회 2022 융합영어영문학(구.English Reading and Teaching) Vol.7 No.2
This study examined the usage of communicative functions stipulated in the 2015 revised national curriculum of English in domestic and abroad elementary English textbooks. To this end, communication functions used in the domestic 5th and 6th-grade elementary school English textbooks were compared. Next, one domestic 6th grade textbook and one 6th grade textbook in the United States, China, and Singapore each were selected and analyzed to compare the usage of communication functions used in the four textbooks. The results show that in the comparison of the 5th and 6th-grade textbooks, more diverse categories of communicative functions were used as the grades went up, and even within the same communicative function category, the 6th-grade textbook contained more diverse communicative functions. Additionally, in the comparison of the domestic and abroad textbooks, it turned out that in Korea’s textbook, the proportion of ‘persuading, and advising,’ ‘socializing,’ and ‘constructing discourse’ was relatively high, and that of ‘expressing knowledge, memory, and belief,’ ‘expressing one’s will,’ and ‘expressing emotions' was relatively low. In addition, Korea’s textbook showed the lowest TTR value in terms of the communication function subcategory, which suggested that it is necessary to use more diverse expressions included in the communication function when developing English textbooks. In conclusion, some implications were also presented.
액화천연가스(LNG)를 사용한 수소 생산 및 액화 공정 개발
노원준 ( Wonjun Noh ),박시환 ( Sihwan Park ),이인규 ( Inkyu Lee ) 한국화학공학회 2021 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.59 No.2
Compare to the gaseous hydrogen, liquid hydrogen has various advantages: easy to transport, high energy density, and low risk of explosion. However, the hydrogen liquefaction process is highly energy intensive because it requires lots of energy for refrigeration. On the other hand, the cold energy of the liquefied natural gas (LNG) is wasted during the regasification. It means there are opportunities to improve the energy efficiency of the hydrogen liquefaction process by recovering wasted LNG cold energy. In addition, hydrogen production by natural gas reforming is one of the most economical ways, thus LNG can be used as a raw material for hydrogen production. In this study, a novel hydrogen production and liquefaction process is proposed by using LNG as a raw material as well as a cold source. To develop this process, the hydrogen liquefaction process using hydrocarbon mixed refrigerant and the helium-neon refrigerant is selected as a base case design. The proposed design is developed by applying LNG as a cold source for the hydrogen precooling. The performance of the proposed process is analyzed in terms of energy consumption and exergy efficiency, and it is compared with the base case design. As the result, the proposed design shows 17.9% of energy reduction and 11.2% of exergy efficiency improvement compare to the base case design.
Optical studies of self-assembled InGaAs/GaAs quantum dot structures grown by atomic layer epitaxy
노희석,송진동,J. I. Lee,최원준,Y. J. Park 한국물리학회 2004 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.45 No.1
We report photoluminescence (PL) and Raman scattering studies of self-assembled InGaAs/GaAs quantum dot (QD) structures grown by atomic layer epitaxy (ALE). PL spectra show that the ground-state energies of the InGaAs QDs decrease with increasing deposition periods from n = 3 to 7. Correspondingly, with increasing n, Raman spectra show that the longitudinal optical (LO) phonon energies ( 291 cmof GaAs decrease, indicating that tensile strain is induced in the GaAs matrix. The PL and the Raman results strongly suggest that the QDs grow in size with increasing deposition periods, giving rise to reduction of the quantum connement eect and relaxation of strain. Importantly, a spectral response at 237 cmwas observed in Raman scattering. This Raman response is attributed to the InAs-like LO phonon mode of the InGaAs QDs, indicating clear evidence of the formation of the ALE-grown QDs.
성대희,조원준,노지선,박중구,박정웅,최동현,안규백 대한용접접합학회 2024 대한용접·접합학회지 Vol.42 No.4
In this study, fracture toughness with the base metal of 9% Ni steel, a cryogenic steel, was evaluated under conditions without hydrogen charging (WO-H) and with hydrogen charging (W-H). Hydrogen charging was performed using an electrochemical cathodic charging method in a electrolyte of 3% NaCl + 0.3% NH4SCN at 19℃ with a current density of 50 A/m². Fracture toughness was assessed at -80℃, -100℃, -130℃, and -160℃ using CTOD (Crack Tip Opening Displacement) tests. The results for WO-H indicated a decrease in fracture toughness values with decreasing temperature, while the results for W-H showed an increase in fracture toughness values as the temperature decreased. In addition, the fracture surfaces and fracture toughness of WO-H and W-H became increasingly similar as the temperature decreased, as observed through scanning electron microscopy (SEM). At -80℃, there was a significant difference in fracture toughness between the WO-H and W-H conditions. WO-H was influenced only by the low temperature, whereas W-H was affected by both low temperature and hydrogen, showing combined effects that led to a decrease in fracture toughness due to hydrogen embrittlement. However, at -160℃, the fracture toughness values for both WO-H and W-H conditions were nearly identical. This suggests that the temperature effect on fracture toughness reduction is greater than hydrogen embrittlement at very low temperatures.