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Polyphenyleneisoxazole 의 물리적 특성
홍석주 한국화학공학회 1971 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.9 No.3
A highly crystalline polyphenyleneisoxazole from the condensation reaction of terephthalohydroxamoyl chloride with 1, 4-diethynylbenzene was consisted of smaller conjugation, which was demonstrated by the electronic spectra. The electric conductivity was decreased with elevating temperature. The corelation of electric conductivity with crystalline structure was studied.
SM45C材의 龜裂成長擧動에 미치는 Over Load의 影響
홍석주 조선대학교 동력자원연구소 1993 動力資源硏究所誌 Vol.15 No.1
In this study, the fatigue test loading constant repeated load over load was carried out with the SM45C specimen of general structure steel, Also, in the over load, the crack retardation phenomenon was discussed. The main conclusions obtained are summarized as followes. 1. From the fatigue test results loaded by constant repeated load, the fatigue crack invariable c and material constant m(c=4.263×10^-9, m=2.872) were concorded with the existing reserch results. In the experimental method of ΔK reduction, ΔK_th is 96.033㎏/㎜^3/2. 2. In the crack nose generated by over load, the compressive residual stresses were gradually lost by loading the repeated load continually, and in fracture line, nearly ceased The growing crack with residual stress lose was confirmed. 3. The plastic zone size formed on crack tip by over load was related to the linear with the compressive residual stresses, and the crack retardated phenomenon by over load predominantly effected by the compressive residual stress was considered.
홍석주,허성호 한국자기공명학회 2001 Journal of the Korean Magnetic Resonance Society Vol.5 No.2
Binding interactions of cationic porphyrins, T4MPyP and TMAP with DNA oligomer d(CGCGAATTCGCG)2 were studied with NMR spectroscopy, UV and CD spectroscopic method. Two porphyrins showed significant differences in NMR, UV and CD data upon binding to DNA. T4MPyP was considered to position more closely to DNA bases through partial intercalation as well as ionic intercalation between the positive charges of porphyrin and phosphate group of DNA at 5’-GC-3’ steps. Contrast to this, TMAP was thought to bind to phosphate of DNA more or less outside of the groove. 영어논문
Surface Modification of Bentonite for the Improvement of Radionuclide Sorption
홍석주,김주은,엄우용 한국방사성폐기물학회 2022 방사성폐기물학회지 Vol.20 No.1
Bentonite is the most probable candidate to be used as a buffer in a deep geological repository with high swelling properties, hydraulic conductivity, thermal conductivity, and radionuclide sorption ability. Among them, the radionuclide sorption ability prevents or delays the transport of radionuclides into the nearby environment when an accident occurs and the radionuclide leaks from the canister, so it needs to be strengthened in terms of long-term disposal safety. Here, we proposed a surface modification method in which some inorganic additives were added to form NaP zeolite on the surface of the bentonite yielded at Yeonil, South Korea. We confirmed that the NaP zeolite was well-formed on the bentonite surface, which also increased the sorption efficiency of Cs and Sr from groundwater conditions. Both NaP and NaX zeolite can be produced and we have demonstrated that the generation mechanism of NaX and NaP is due to the number of homogeneous/heterogeneous nucleation sites and the number of nutrients supplied from an aluminosilicate gel during the surface modification process. This study showed the potential of surface modification on bentonite to enhance the safety of deep geological radioactive waste repository by improving the radionuclide sorption ability of bentonite.
Rancidity Prediction of Soybean Oil by Using Near-Infrared Spectroscopy Techniques
홍석주,이아영,한윤혁,박종민,서정덕,김기석 한국농업기계학회 2018 바이오시스템공학 Vol.43 No.3
Purpose: This study evaluated the feasibility of a near-infrared spectroscopy technique for the rancidity prediction of soybean oil. Methods: A near-infrared spectroscopy technique was used to evaluate the rancidity of soybean oils which were artificially deteriorated. A soybean oil sample was collected, and the acid values were measured using titrimetric analysis. In addition, the transmission spectra of the samples were obtained for whole test periods. The prediction model for the acid value was constructed by using a partial least-squares regression (PLSR) technique and the appropriate spectrum preprocessing methods. Furthermore, optimal wavelength selection methods such as variable importance in projection (VIP) and bootstrap of beta coefficients were applied to select the most appropriate variables from the preprocessed spectra. Results: There were significantly different increases in the acid values from the sixth days onwards during the 14-day test period. In addition, it was observed that the NIR spectra that exhibited intense absorption at 1,195 nm and 1,410 nm could indicate the degradation of soybean oil. The PLSR model developed using the Savitzky-Golay 2nd order derivative method for preprocessing exhibited the highest performance in predicting the acid value of soybean oil samples. onclusions: The study helped establish the feasibility of predicting the rancidity of the soybean oil (using its acid value) by means of a NIR spectroscopy together with optimal variable selection methods successfully. The experimental results suggested that the wavelengths of 1,150 nm and 1,450 nm, which were highly correlated with the largest absorption by the second and first overtone of the C-H, O-H stretch vibrational transition, were caused by the deterioration of soybean oil.
경복궁 중건 시 창의궁 함일재의 흥복전 이건에 관한 연구
홍석주,김버들 한국건축역사학회 2022 건축역사연구 Vol.31 No.6
본 연구는 273년 만에 이루어진 19세기 경복궁 중건 공사 중 흥복전에 관한 연구이다. 7천여 칸이 넘는 궁궐 공사가 빠른 시일 내에 가능했던 이유는 기존 건축을 재활용하는 것이다. 흥복전의 전신은 영조의 잠저인 창의궁 함일재이며, 창의궁은 효종이 출가한 공주를 위해 지어준 인평위궁이었다. 본 연구는 창의궁의 변화와 함일재가 흥복전으로 이건되는 과정을 통해 비대칭적 제택건축에서 대칭적인 궁궐의 내전건축으로 바뀌는 과정을 확인하였다. 흥복전은 고종 10년과 고종 13년 두 번의 내전 화재에도 소실되지 않고 남은 유일한 내전건축임도 확인하였다. 따라서 경복궁 흥복전의 탐구과정은 19세기 경복궁 중건뿐만 아니라, 17세기 도성 제택 건축의 고찰의 가능성을 높일 수 있다.