• Proceedings of the KSME Conference
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• 2005.11a
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• pp.143.1-143.1
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• 2005

• Fire Science and Engineering
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• v.26 no.4
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• pp.1-9
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• 2012

We have examined In order to compare each other from explosion and combustion characteristics about the dusts which collects from manufacturing process of wheat flour and cosmetics manufacturing process of functional Keratin removal soap at the small and medium enterprise style. We measured explosive pressure and explosive lower limit which follows in change of concentration change at the time of talc addition uses Hartman dust explosion apparatus, also measured weight loss and endothermic quantity uses DSC and TGA. The explosion test results show that increased explosive lower limit concentration and explosive pressure decreased by the increased ratio of the talc dust. And the DSC results show that heat flux and temperature decreased by the increased ratio of the talc dust. Also increased in raising temperature causes initial smoldering temperature to move towards low temperature section and the endothermic quantity increased on a large scale. Together the TGA results show that weight loss decreased by the increased ratio of the talc dust. From this research we have assured the successive dust explosion mechanism study will play a key role as a significant safety securing guideline against the dust explosion.

• Korean Journal of Food Science and Technology
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• v.16 no.1
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• pp.113-119
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• 1984

Initial moisture content and weight of the rice bran and treatment time were identified as important variables for the inactivation of lipase and peroxidase present in rice bran. Multiple regression analysis was used to obtain a prediction equation to measure the effects of moisture content and weight of the sample and microwave treatment time on the residual lipase activity and loss in weight. It was found that the microwave treatment did not affect acid value and extractability of the rice bran oil.

• Journal of Advanced Marine Engineering and Technology
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• v.30 no.6
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• pp.731-739
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• 2006

Corrosion and lassitude are very important in the metal construction Currently, the shot peening is used much for removing the defect on the surface, improving the fatigue strength on surface. In this study. the influence of shot peening to the corrosion property were investigated in 3.5% NaCl, 10% HNO3 + 3% HF. 6% FeC13. The immersion test was performed on two kind of specimen(Removed corrosion product. RCP and Continuous immersed specimen: CIS). The immersion periods was 3600hours. Corrosion potential. weight loss, and fatigue crack growth characteristics were investigated. The result, shot peening in corrosion potential showed stable potential. Also, shot peening displayed small Weight loss than un peening. And Fatigue crack resistivity of shot peening in corrosion solution's fatigue crack appeared greatly than un peening.

• The Journal of Korea Institute of Information, Electronics, and Communication Technology
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• v.11 no.2
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• pp.144-149
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• 2018

The eggs are incubated for 18 days through the generator and incubated in the developing incubator. During the developmental period, the weight loss of the fetus is correlated with the ventricular formation, and the proper ventricular formation is also associated with the healthy embryonic hatching and the egg hatching rate. However, in the incubator period of the domestic hatchery, it is a reality to acquire the resultant side by the Iranian standard weight measurement with the experience of the hatchery and the person concerned and the development period without the apparatus for measuring the present weight. As a result, prevalence of early mortality, hunger and illness during hatching are frequent. Monitoring the reduction of weaning weight is crucial to obtaining chick quality and hatching performance with weight changes within the development machine. Water loss is different depending on the size of eggs, egg shell, and elder group. We can expect to increase the hatching rate by measuring the weight change in real time and optimizing the ventilation change accordingly. There is a need to develop a real-time measurement system that can control 10 to 13% reduction of the total weight during hatching. The system through this study is a way to check the one - time directly when moving the existing egg, and it is impossible to control the measurement of the fetal water evaporation within the development period. Unlike systems that do not affect the hatching rate, four load cells are connected in parallel on the Arduino sketch board and the AT-command command is used to connect the mobile phone and computer in real time. The communication speed of Bluetooth was set to 15200 to match the communication speed of Arduino and Hyper-terminal program. The real - time monitoring system was designed to visually check the change of the weight of the fetus in the artificial incubator. In this way, we aimed to improve the hatching rate and health condition of the hatching eggs.

• Journal of Ginseng Research
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• v.32 no.4
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• pp.382-389
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• 2008

To achieve a better understanding of protective effects of water extracts of Panax ginseng against TCDD-induced toxicities, we monitored physiological and clinical changes in rat for 4 weeks after administrations of each Panax Ginseng extract or TCDD, and co-administration of the two materials. For this study, 120 male Sprague-Dawley (SD) rats weighing 190-210 g each (8 weeks old) were divided into four groups: TCDD-administered, co-administered group with TCDD and ginseng extract, ginseng extract-administered, and control group. The TCDD-administered group received single dose of TCDD in a corn oil vehicle ($25\;{\mu}g/kg$ body weight) by intraperitoneal administration on Day 1. The Panax ginseng extracts-administered group received intraperitoneally 100 mg/kg body weight every other day for one month. For the co-administered group with TCDD and ginseng extracts, Panax ginseng extracts were intraperitoneally administered to rats at 100 mg/kg body weight every other day for one month after a single intraperitoneal dose of $25\;{\mu}g$ of TCDD/kg body weight on Day 1. Panax ginseng extracts attenuated the mortality induced by TCDD administration. The extracts also slightly attenuated the TCDD-induced body weight loss. Administration of TCDD alone increased liver weight at 2, 5, and 16 days after administration of TCDD. Administration of Panax ginseng extracts rather decreased liver weight through whole the experimental period, but which was statistically insignificant. Administration of TCDD alone at $25\;{\mu}g/kg$ body weight increased both serum enzyme activities of alanine aminotransferase (ALT) and aspartate aminotransferase (AST) at 32 days, indicating that liver damage occurred maximally at that time. Ginseng extract administration caused insignificant changes in serum ALT, but gradually decreased in AST as the exposure time increased. Coadministration of TCDD and ginseng extracts caused serum AST activity to significant recovery to normal value at 16 days and 32 days after exposure to TCDD. The extracts also significantly decreased the TCDD-induced ALT activity after 16 days of TCDD administration. These results suggest that Panax ginseng extracts may possess a protective effect against TCDD-induced toxicities including hepatotoxicity in rats.

• Journal of Practical Agriculture & Fisheries Research
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• v.21 no.2
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• pp.59-69
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• 2019

This study was carried out to investigate effects of soil water content on growth and antioxidative enzymes activity of tomato seedlings during the nursery period. The water stress significantly damages morphological, physiological, and biochemical activities in plants. The seedlings planted with soil on the tray were irrigated and categorized into 3 groups with 30 g, 40 g, and 50 g of plant-soil weight. After then, the changes in weight of the soil and the seedling were measured evey 2 hours for 4 days and the leaf temperature was measured with the thermal-camera at the same time. The antioxidant enzymes were measured to determine the level of stress using all of the seedling samples. The result showed that the decrease of soil weight in the day time was faster than that in the night time, but there was no significant difference in the weight loss of the seedlings and soil among the groups. However, the group with 50 g of wight showed the highest SOD and POD contents. This is considered that the continuously wet soil on the root zone of the seedlings caused more stress for the seedlings. Therefore, it is concluded that the excess moisture content causes stress to stimulate the secretion of antioxidant enzymes, and the effect of stress is required to be analyzed comprehensively using environmental data and also the physiological data that are collected over a longer period.

• Journal of the Mineralogical Society of Korea
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• v.32 no.2
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• pp.113-126
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• 2019

This study aimed to effectively dissolve sulfide minerals through microwave-nitric acid leaching of invisible gold concentrate and then recover gold from the solid-residue with fire assay. For the purposes, this study conducted microwave-nitric acid leaching experiments to examine nitric acid concentration, time of microwave leaching, and sample addition effect. As results of the experiments, this study discovered that the weight loss rate of solid-residue increased as nitric acid concentration and microwave leaching time increased while weight loss rate decreased as sample addition increased. In an XRD analysis with solid-residue, it was discovered that pyrite completely disappeared when the nitric acid concentrate was 6 M and the microwave leaching time was 18 minutes. When a fire assay was carried out with solid-residue, gold particles with more content were recovered as nitric acid concentration and microwave leaching time increased whereas gold particles with more gold content were recovered as the sample addition decreased.

• Korean Journal of Food Science and Technology
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• v.29 no.2
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• pp.390-393
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• 1997

${\kappa}-Carrageenan-based$ film prepared by mixing 2% ${\kappa}-carrageenan$, 0.1% KCl, 0.75% polyethylene glycol, and 0.75% glycerol was examined to be used as a potential packaging material for mackerel mince for preventing moisture loss and lipid oxidation. Mackerel mince patties were vacuum-packaged with the film and stored at $20^{\circ}C,\;10^{\circ}C,\;0^{\circ}C,\;and\;-15^{\circ}C$; nonpackaged patties were also stored at $0^{\circ}C$. Weight reduction, peroxide value (PV), and thiobarbituric acid (TBA) value were measured during storage. The packaged or nonpackaged samples stored at $20^{\circ}C,\;10^{\circ}C,\;and\;0^{\circ}C$ showed a 60% weight reduction between 2 and 15 days of storage, while the weight reduction of the samples stored at $-15^{\circ}C$ was about 3% after 25 days. The nonpackaged samples stored at $0^{\circ}C$ showed a steady increase in lipid oxidation with the PV reaching 23 mequivalent peroxide (PO)/㎏ on day 20 and with the TBA value at 0.4 mole malonaldehyde (MA)/g on day 5. The PV and TBA values of the samples vacuum-packaged with the carrageenan-based film were below 2 mequivalent PO/㎏ and below 0.1 mole MA/g, respectively, regardless of storage temperature throughout the storage of 28 days.

• Journal of the Society of Disaster Information
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• v.10 no.1
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• pp.71-83
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• 2014

This study carried out an experiment in order to compare thermal characteristics after collecting dust generated in the process of disposing of waste tire, plywood flour in the process of manufacturing plywood, salicylic acid dust in the process of manufacturing functional soap, and dust in the process of manufacturing wheat powder, which has potential fire and explosion hazard. According to the results of experiment, the analysis showed that all samples subject to the experiment were in the condition where heat flux decreased and temperature decreased as the quantity of added talc was increased. This shows that decomposition rate decreased, and hazard decreased. However, in all of samples subject to the experiment, as heating rate increased, endothermic onset temperature moved to the low-temperature part, and the amount of absorbed heat was largely increased. This showed that the decomposition hazard of sample increased as heating rate increased, according to the analysis. Besides, TGA experiment results showed that thermal stability was secured because total weight loss decreased as the amount of talc was increased for all samples subject to the experiment regarding the ratio of weight loss. It is expected that the continuous research and supplementation of dust explosion mechanism in the future will contribute to the establishment of measures for the effective dust explosion prevention.