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The characterization of glass-ceramics made from waste glass and fly ash
Yeon-Hum Yun,Cheon-Young Park,Soon-Do Yoon 한양대학교 세라믹연구소 2007 Journal of Ceramic Processing Research Vol.8 No.6
Glass-ceramics with well-crystallized whisker-type crystals were prepared by milling and heat treatment using fly ash from a thermal power plant and waste glass cullet. Various heat treatment temperatures [850, 900, 950 and 1000 oC] were used to obtain a glass-ceramics that have the optimum crystal phase and mechanical properties. The crystallization of a whisker-type phase in the matrix was achieved in the heat treatment temperature range of 950-1000 oC, and the whisker-type main crystal phase in the glass-ceramics was wollastonite [CaSiO3] The heat treatment temperature range [950-1000 oC] also brought about much better mechanical properties. Crystallinity, morphological properties, and chemical compositions were observed by Xray diffraction (XRD), field emission-scanning electron microscopy (FE-SEM), and an energy dispersive X-ray spectrometer (EDS). Various properties such as density, compressive strength, bending strength and chemical durability were also examined. Glass-ceramics with well-crystallized whisker-type crystals were prepared by milling and heat treatment using fly ash from a thermal power plant and waste glass cullet. Various heat treatment temperatures [850, 900, 950 and 1000 oC] were used to obtain a glass-ceramics that have the optimum crystal phase and mechanical properties. The crystallization of a whisker-type phase in the matrix was achieved in the heat treatment temperature range of 950-1000 oC, and the whisker-type main crystal phase in the glass-ceramics was wollastonite [CaSiO3] The heat treatment temperature range [950-1000 oC] also brought about much better mechanical properties. Crystallinity, morphological properties, and chemical compositions were observed by Xray diffraction (XRD), field emission-scanning electron microscopy (FE-SEM), and an energy dispersive X-ray spectrometer (EDS). Various properties such as density, compressive strength, bending strength and chemical durability were also examined.
연효흠(Yeon Hyo-Hum),최경신(Choi Kyung-Sin),하일홍(Ha Il-Hong) 한국마린엔지니어링학회 2006 한국마린엔지니어링학회 학술대회 논문집 Vol.2006 No.-
This document summarizes the work completed during the intersessional period by the IMO SLF correspondence group on the drafting of Safety standards for small fishing vessels, which was established at IMO SLF 48.
Sung Hum Yeon,Jae Hyun Oh,In Hong Jeong,Young Joon Ahn 한국응용곤충학회 2011 한국응용곤충학회 학술대회논문집 Vol.2011 No.05
The emulsion and micro-encapsuled formulation from three essential oils, cassia, thyme white and lemon grass were tested for their insecticidal activities against Lycoriella ingenua (Dufour) adults at 0.3% concentration. As a result, the micro-encapsules than emulsion formulation was confirmed to show greater activity. Based on this result, insecticidal activities at several levels of concentration were examined, resulting in more than 80% insecticidal activity after 30 minutes at 0.6% level of cassia formulation. And also, insecticidal activity of three oil-based micro-encapsuled formulations lasted for up to 12 hours at 0.9% concentration. The main ingredients derived from three essential oils were evaluated on the insecticidal activity against Lycoriella ingenua. As a result, in case of thymol from thyme white, it showed more than 80% mortality after over 30 minutes at 0.25%, and in cinnamic aldehyde and citral, exhibited 88% and 82% mortality after 30 minutes at the 0.5% level, respectively. These three compounds were examined for whether the insecticidal activity was maintained depending on being over time. In case of thymol, it maintained good insecticidal activity against Lycoriella ingenua at 0.5% level until 120 hours, while cinnamic aldehyde and citral showed lower activity after 12 hours.
도화원도와 수치지도를 이용한 소음지도의 초과소음노출 면적 및 인구에 대한 비교 분석
연정흠(Yeon, Jung-Hum),이병찬(Lee, Byung-Chan) 한국소음진동공학회 2012 한국소음진동공학회 논문집 Vol.22 No.2
This paper presents differences of road traffic noise maps were generated by using the draft map and two digital maps with different versions. As a first step, the calculation of the areas of excessive noise exposure was made for the draft map and each digital map version. Subsequently, the areas of excessive noise exposure were compared so as to determine how different from each other. Then, comparison of the populations exposed to excessive noise was also conducted in the same way. It was found that the most accurate noise map was obtained when using the combination of the draft map containing all attribute information and the digital map Ver 2.0. This result indicates that more information on the height and the number of floors of the individual building is required in order to obtain more accurate population exposed to excessive noise, thus creating a more accurate noise map.
Yun, Yeon-Hum,Kim, Eun-Sik,Shim, Wang-Geun,Yoon, Soon-Do THE KOREAN SOCIETY OF INDUSTRIAL AND ENGINEERING 2018 JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY -S Vol.68 No.-
<P><B>Abstract</B></P> <P>The main objective of this study is to prepare the bionanocomposite films using mungbean starch (MBS), PVA, ZnS, and plasticizers, and to evaluate the physical properties, thermal stability, and photocatalytic activity. The bionanocomposite films were cross-linked by heat-curing process. The ZnS and bionanocomposite films were characterized by FT-IR, XRD, and SEM. The results indicated that the mechanical properties and water resistance enhanced up to 1.2–1.5 times by the addition of nano-ZnS particles, and the thermal stability was improved by the addition of nano-ZnS particles. The photocatalytic activity of the bionanocomposite films added nano-ZnS particles was examined using bisphenol A (BPA) and methyl orange (MO). In addition, the photodegradation efficiency of BPA and MO was evaluated using the pseudo-first order kinetic model (PFOK).</P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Preparation of functional chitosan-based nanocomposite films containing ZnS nanoparticles
Yun, Yeon-Hum,Youn, Hyun-Gi,Shin, Jin-Young,Yoon, Soon-Do Elsevier 2017 INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES Vol.104 No.1
<P><B>Abstract</B></P> <P>In this study, nanocomposite films were synthesized by chitosan (CH), PVA, ZnS, sulfosuccinic acid, and plasticizers. The nanocomposite films were cross-linked by the heat curing process. ZnS was synthesized by the reaction of Zn(CH<SUB>3</SUB>COO)<SUB>2</SUB> and Na<SUB>2</SUB>S2O<SUB>3</SUB>·5H<SUB>2</SUB>O in aqueous solution via a template-free hydrothermal process. The prepared ZnS and CH/PVA nanocomposite films were characterized by X-ray diffraction, Fourier transform IR spectroscopy, and scanning electronic microscopy. The results of this study confirmed the presence of specific peaks of ZnS in the prepared nanocomposite films, and the intensity of these peaks increased with increasing ZnS contents. Tensile strength, elongation at break, water barrier properties, and thermal properties of the prepared nanocomposite films were also investigated, indicating that the addition of ZnS nanoparticles improved the physical and thermal properties. In addition, the photocatalytic degradability of the prepared films containing ZnS nanoparticles was evaluated using 2,4-dichlorophenoxyacetic acid and methyl orange.</P>
Yun, Yeon-Hum,Lee, Chang-Moon,Kim, Youn-Sop,Yoon, Soon-Do Elsevier 2017 Food Research International Vol.100 No.1
<P>This paper reports on a method of preparing chitosan-based films to which sulfosuccinic acid (SSA) is added for crosslinking agent with/without UV curing treatment and applications of a coating materials for foods. The physical, thermal, and optical properties of the UV cured chitosan-based films are investigated including their tensile strength (TS), elongation at break (%E), degree of swelling (DS), solubility (S), and water vapor absorption as well as their biodegradability in soil and applicability of the coating on a fruit. We also evaluated the physical properties of the prepared films to which glycerol (GL), xylitol (XL), and sorbitol (SO) are added to be used as plasticizers. The surface and topography of the prepared films are investigated by scanning electronic microscopy (SEM) and atomic force microscopy analysis (AFM). The results indicate that the films UV cured for 20 min possess optimal physical and thermal properties compared to that of non-cured films. The mechanical, thermal, and water barrier properties of SO-added film are also found to be superior to other films with added GL and XL. The degree of biodegradability revealed that the films are degraded by about 40-65% after 220 days.</P>