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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.
Base Sequence의 변화가 이중나선 Oligonucleotides의 열적 안정성과 Dynamics에 미치는 효과
홍석주,유승렬,김은희,권태익,허성호 충남대학교 기초과학연구소 1997 忠南科學硏究誌 Vol.24 No.2
We have synthesized four model oligonucleotides containing biologically significant base sequence and observerd the effects of variation of the base sequence on thermal stability and dynamics of their double helical structures with NMR spectroscopy and UV melting experiments. The results showed that variation of the base sequence could cause no observable change in the global structure of oligonucleotide double helices but cause perturbation of the local structure. This resulted in the change in dynamics of double helices and furthermore in a significant effect on thermal stability. Binding of berenil to each oligonucleotide also had an effect on dynamics and thermal stability of its double helical structure differently upon its base sequence.
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
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.
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.