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Kang S.-G.,Laboratory of Wood Science | Kang S.-G.,Chungnam National University | Choi C.,Laboratory of Wood Science | Choi C.,Chungnam National University | And 9 more authors.
Journal of the Faculty of Agriculture, Kyushu University | Year: 2015

This study was performed to evaluate the suitability and burning characteristics of thermally-modified wood for use as auto camping charcoal. Four aspects of the burning were measured using a cone calorimeter: ignition time, total heat released, heat release rate, and flame-out time. In addition, elemental analysis was carried out using an elemental analyzer. Thermally-modified wood has short ignition and flame-out times because of its low Oxygen/Carbon rate. The total heat released and the heat release rate of thermally-modified wood is higher than that of other wood due to its low oxygen and nitrogen rate and high HHV (Higher Heating Values). With a shorter flame-out time, carbonization takes less time, and the maintenance time is longer. These characteristics of thermally-modified wood make it favorable for use as auto camping charcoal.

Kang S.-G.,Laboratory of Wood Science | Kang S.-G.,Chungnam National University | Lee S.-A.,Laboratory of Wood Science | Lee S.-A.,Chungnam National University | And 5 more authors.
Journal of the Faculty of Agriculture, Kyushu University | Year: 2015

The heat transfer and thermal efficiency of Paulownia coreana (low-density wood) and high-density fiber board were measured via a comparative analysis of heat transfer, and the suitability of the wood as a finishing material was evaluated. A comparative analysis of heat transfer is calculated by verifying the heat transfer and change in temperature of the water bottle both inside and outside of the sample box. The total transferred heat is then divided by conduction, convection, and radiation. The results show 18.05 W of heat was transferred to water bottle in the low-density Paulownia coreana UYEKI, and 12.5 W in the high-density fiberboard. The total heat from the heating source was 30 W. This indicates that a heat loss of low density wood was smaller than that of high density fiberboard. A difference was found in the amount of heat transferred, with a majority due to radiation: 0.02 W of conduction, 1.5 W of convection, and 3.98 W of radiation. These results indicate that the low density wood is appropriate for use as a thermal insulation building material.

Shim S.-M.I.,Research Institute of Human Ecology | Kwon H.,Research Institute of Human Ecology | Kwon H.,Seoul National University
Journal of Food Biochemistry | Year: 2010

This study used a simulated in vitro digestion model coupled with caco-2 cell to assess the digestive stability and absorption of aloin, aloe-emodin and aloenin A. Aloenin A and aloe-emodin were stable and entirely recovered during simulated digestion, but 50% of aloin was lost. Approximately 53.2, 7.3 and 28.7% of aloe-emodin, aloenin A and aloin, respectively, was transported into both apical and basolateral compartments after 1 h incubation in caco-2 cell. The involvement of several transporter proteins for aloin and aloenin A was examined. An inhibitor of SGLT1 on apical surface (phloridzin) or that of GLUT2 on basolateral membrane (cytochalasin B) reduced the absorption of aloin by 40 or 60%, respectively, indicating that aloin is likely to be a partial substrate of SGLT1. In the presence of an efflux transporter inhibitor (verapamil), the transport of aloenin A through an intentinal apical membrane increased up to 2.1 times compared with the control (without verapamil). © 2010, Wiley Periodicals, Inc.

Park H.-J.,Laboratory of Wood Science | Park H.-J.,Research Institute of Human Ecology | Wen M.-Y.,Laboratory of Wood Science | Wen M.-Y.,Research Institute of Human Ecology | And 6 more authors.
Journal of the Faculty of Agriculture, Kyushu University | Year: 2015

An intumescent fire retardant was synthesized with of ammonium phosphate polymer (APP), guanyl urea phosphate (GUP) as main components. And Korean pine (Pinns koraiensis) was impregnated with this fire retardant by a vacuum-pressure process. The fire retardant performance of treated Korean pine wood with various chemical uptakes was assessed by cone calorimeter. The combustion parameters, including heating release rate (HRR), total heat release (THR), effective heat of combustion (EHC), total mass loss (TML), smoke production rate (SPR) and yield of CO (CO Y) were recorded simultaneously. To trace the combustion behavior, thermal degradation behavior was analyzed by thermogravimetry (TG). The results indicated that when the uptake of fire retardant chemical above 0.118g/cm3, treated Korean pine wood could meet the fire retardant criterion. Heat release was lowered and heat release rate slow down significantly. TG analysis showed that fire retardant treatment increased thermal stabilization, accelerated carbonization and lowered the decomposition temperature of wood(< 300°C). Wood cellulose decomposed toward carbonation direction at lower temperature, producing more char and correspondingly less flammable volatiles.

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