• Journal of Korean Society of Occupational and Environmental Hygiene
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• v.1 no.2
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• pp.200-213
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• 1991

ln order to acquire the fundamental data for the organic solvents in bond and to contribute the health improvement of workers in deprtment of organic solvents in shoes manufacturing industries. The authors surveyed the contents of organic solvent in adhesive and determined the amount of volatilization of organic solvent by time and temperature with gaschromatography from March to September 1990. The results were as follows; 1) The kinds for organic solvents in bond were 9 that was Toluene, C-Hexane, N-Hexane, C-Hexanon, Aceton, Methyl Ethyl Keton, Dimethyl Formamide, Etyly Acetate. 2) Toluene and Methyl Ethyl Keton among the organic solvents in adhesive were over 80.18%. 3) The amount of volatilization of Methyl Cyclohexanone and Aceton by time and temperature were the most level than other compounds.

• Journal of Microbiology and Biotechnology
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• v.25 no.4
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• pp.459-463
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• 2015

This study evaluated the microbial conversion of coconut oil waste, a major agro-residue in tropical countries, into single cell oil (SCO) feedstock for biodiesel production. Copra cake was used as a low-cost renewable substrate without any prior chemical or enzymatic pretreatment for submerged growth of an oleaginous tropical mangrove fungus, Aspergillus terreus IBB M1. The SCO extracted from fermented biomass was converted into fatty acid methyl esters (FAMEs) by transesterification and evaluated on the basis of fatty acid profiles and key fuel properties for biodiesel. The fungus produced a biomass (8.2 g/l) yielding 257 mg/g copra cake SCO with ~98% FAMEs. The FAMEs were mainly composed of saturated methyl esters (61.2%) of medium-chain fatty acids (C12-C18) with methyl oleate (C18:1; 16.57%) and methyl linoleate (C18:2; 19.97%) making up the unsaturated content. A higher content of both saturated FAMEs and methyl oleate along with the absence of polyunsaturated FAMEs with ≥4 double bonds is expected to impart good fuel quality. This was evident from the predicted and experimentally determined key fuel properties of FAMEs (density, kinematic viscosity, iodine value, acid number, cetane number), which were in accordance with the international (ASTM D6751, EN 14214) and national (IS 15607) biodiesel standards, suggesting their suitability as a biodiesel fuel. The low cost, renewable nature, and easy availability of copra cake, its conversion into SCO without any thermochemical pretreatment, and pelleted fungal growth facilitating easier downstream processing by simple filtration make this process cost effective and environmentally favorable.

• Journal of Food Hygiene and Safety
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• v.17 no.2
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• pp.87-93
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• 2002

The removal of three pesticides which were residued in chinese cabbage was investigated during making process of Kimchi. When chinese cabbage was washed by water, the removal rates of three pesticides were 62.0%, 54.8% and 61.1% for pirimiphos-methyl, chlorpyrifos and prothiofos, respectively. Pesticides remaining in chinese cabbage after washing by water were also removed from 22.4% to 23.8% by salting. During the fermentation of kimchi for 24 days at 4。C, the pH was lowered 4.5 from 5.8 and the residual amount of pesticides was decreased by 51.4% to 69.4% for three Pesticides remaining after washing and salting On the other hand, when Kimchi was fermented under various temperature for 11 days, the residual amount of chlorpyrifos was decreased up to 29.2%, 45.0% and 77.3% of initial concentration at 4, 10 and 20 。C, respectively. The residual amount of chlorpyrifos in Kimchi was decreased up to 16.3% by heating at 100 。C for 6.5 minutes.

• Korean Journal of Food Science and Technology
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• v.29 no.4
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• pp.623-625
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• 1997

This study was carried out to investigate the effect of storage period on flavor components of Korean kiwifruits (Actinidia deliciosa Planch.) stored at $20^{\circ}C$. The major volatile components of Korean kiwifruits analyzed by GC and GC-MS were pentanal, methyl butanoate, ethyl pentanoate, heptanone, (E)-2-hexenal, ethyl hexanoate, 1-hexanol, cyclohexanol, butyl hexanoate, linalool oxide, linalool, butyl heptanoate, methyl benzoate, ethyl benzoate. Among them, (E)-2-hexenal was the major component in premature fruit but on further ripening ethyl butanoate began to dominate the component profile.

• Polymer(Korea)
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• v.24 no.2
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• pp.168-173
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• 2000

Radical copolymerization of N-isopropylacrylamide (NIPAAM) with methyl methacrylate (MMA) was carried out in 1,4-dioxane using 2,2'-azobisisobutyronitrile (AIBN). To investigate the reactivity ratios of NIPAAM and MMA at different reaction temperatures, the copolymerization was allowed to proceed to low conversion (less than 10 wt%), and the reaction temperatures were 50, 60, and 7$0^{\circ}C$. The monomer reactivity ratios of NIPAAM and MMA were estimated by the graphical methods according to the Finemann-Ross equation. The ${\gamma}$$_1$ and ${\gamma}$$_2$ values for NIPAAM-MMA were 0.259 and 2.782 at 5$0^{\circ}C$, 0.271 and 2.819 at 6$0^{\circ}C$, and 0.286 and 2.915 at 7$0^{\circ}C$, respectively. As the reaction temperature increased, the ${\gamma}$$_1$ and ${\gamma}$$_2$ values increased. The activation energy difference was estimated by comparing the reactivity ratios at different reaction temperatures.

• Korean Journal of Weed Science
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• v.12 no.1
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• pp.1-7
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• 1992

The experiment was conducted to investigate effects of bensulfuron-methyl{methyl 2-((((((4,6-dimethoxypyrimidin-2-yl)amino)carbony)amino)sulfonyl)methyl)benzoate}on bud sprouting, percent regrowth, and regrowth from growth cessation in Eleocharis kuroguwai. Application of bensulfuron-methyl resulted in sprouts of two of three lateral buds in addition to the apical bud of E. kuroguwai. With bensulfuron-methyl the culms elongated from the sprouted buds were killed soon after emergence. However, the buds remained biologically active. During the period of growth cessation the tuber buds respired in a minimum rate, but respiration began to increase with regrowth. At regrowth increase in the respiration was greater in the lateral buds than in the apical bud. Days required to regrowth was 35 days in the suppressed apical bud when applied at the rate of 51 g a. i. ha bensulfuron-methyl, while the suppressed lateral buds sprouted first and second required 29 and 28 dyas, respectively. After regrowth number of new culms was two to three times greater in the lateral buds than in the apical bud.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.14 no.4
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• pp.2055-2061
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• 2013

Recently, an understanding of new sources of liquid hydrocarbons such as bio-ethanol is economically very important. Successful design of distillation columns in a separation process depend on the availability of accurate vapor-liquid equilibrium data. For the binary system of Ethanol/3-methyl-l-butanol mixture, isothermal Vapor-liquid equilibrium data were measured at temperature of 50, 55, 60, 65, 70, 75 and $80^{\circ}C$. An empirical relation to predict Vapor-liquid equilibrium data was obtained from the above measured data. The predicted values are compared with the measured ones to be in a good agreement within accuracy of ${\pm}0.0005$, ${\pm}0.0022$.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.11 no.1
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• pp.228-233
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• 2010

Mn-doped $Zn_2SiO_4$ phosphor particles having submicrometer sizes were synthesized by a solid-state reaction method using methyl hydrogen polysiloxane-treated ZnO, fumed $SiO_2$ and various Mn sources. The crystallization and photoluminescent properties of the phosphor particles were investigated by X-ray diffraction(XRD), scanning electron microscope(SEM), and by their photoluminescence(PL) spectra. Due to the effect of the dispersion and coherence of the methyl hydrogen polysiloxane-treated ZnO, the Mn-doped $Zn_2SiO_4$ particles were successfully obtained by a solid state method at $1000^{\circ}C$, and the maximum PL intensity of the prepared particles under vacuum ultra violet(VUV) excitation occurred at a Mn concentration of 0.02mol and a sintering temperature of $1000^{\circ}C$.

• Journal of the Korean Applied Science and Technology
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• v.31 no.3
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• pp.337-344
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• 2014

In this paper, we have examined the interaction of low bandgap polymer {poly(2-heptadecyl-4-vinylthieno[3,4-d]thiazole)(PHVTT)} with ionic liquids. Further, we have studied the temperature dependent interactions between the ionic liquids [tri-butyl methyl ammonium methyl sulfate ([TBMA][$MeSO_4$]), methyl imidazolium chloride ([MIM]Cl) and butyl methyl imidazolium chloride ([BMIM]Cl)] and polymer using UV-vis spectroscopy, FT-IR spectroscopy, photoluminescence (PL) spectroscopy, as a function of temperature at 21, 28, 32, $37^{\circ}C$. These experimental results suggest that interactions of polymer with ionic liquids ([MIM]Cl, [TBMA][$MeSO_4$]) showed weak interactions by increasing temperature but [BMIM]Cl has no significant effect with increase in temperature.

• Archives of Pharmacal Research
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• v.14 no.4
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• pp.342-345
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• 1991

Synthesis of series of 3-benzalphthalidyl-amino acids and their corresponding methyl esters, dipeptides and tripeptide methyl esters 2a-7c is decribed. All 3-benzalphthalidynamino acids 2a-g were found to possess a remarkable antimicrobial properties against a number of microorganisms and fungi.