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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.
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
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.
주거환경 개선을 고려한 담장 허물기 사업과 범죄예방 환경설계의 상관성에 관한 연구 -성대골 중심으로-
홍석주,빈혜진 한국생활환경학회 2017 한국생활환경학회지 Vol.24 No.6
Sustainable regeneration of the old residential area promotes the quality improvement of the poor environmentand coexists with maintaining the identity of the city through the formation of the inhabitants community. TheCrime Prevention Through Environment Design(CPTED), which eliminates the possibility of crime by improving theenvironment of the old residential area, is becoming important as part of urban regeneration. The purpose of this studyis to find a methodology that has a great synergy effect on the improvement of residential environment for villagesthat are safe from crime. The research method is to identify the improved status of The Wall Removal, investigatethe correlation with elements of crime prevention environment design, and analyze the effectiveness of CPTED inSungdae Valley. The Sungdae valley has a safe alley environment created by The Wall Removal Project and CrimePrevention Through Environment Design(CPTED), improved residential environment enhances cooperative safety networksand proves the effectiveness of community rebuilding.
破壞靭性 K_RC 決定을 위한 R-曲線法의 基礎的 硏究
홍석주 조선대학교 동력자원연구소 1988 動力資源硏究所誌 Vol.10 No.1
This paper was carried out to research the determination of critical resistance value K_RC, by using the R-curve method. The crack extension resistance curve (R-curve) is a plot of material resistance values (KR) Vs. Crack extensions value(Δa). The main conclusions are as follows. 1. The shape of R-curve of a material having a given thickess does not depend on initial crack length a_o. 2. The Value of critical stress Intensity factor K_RC of a material having a given thickness and specimen size does not depeud on the initial crack length, but retains a constant Value. 3. R-curve depends on specimen thickness, but does not depend on loading method.