Kim S.C.,Mokpo National University |
Shim W.G.,Chonnam National University
Applied Catalysis B: Environmental | Year: 2010
Catalytic combustion of volatile organic compounds (VOCs: benzene and toluene) was studied over manganese oxide catalysts (Mn3O4, Mn2O3 and MnO2) and over the promoted manganese oxide catalysts with alkaline metal and alkaline earth metal. Their properties and performance were characterized by using the Brunauer Emmett Teller (BET), temperature programmed reduction (TPR), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). The sequence of catalytic activity was as follows: Mn3O4>Mn2O3>MnO2, which was correlated with the oxygen mobility on the catalyst. Each addition of potassium (K), calcium (Ca) and magnesium (Mg) to Mn3O4 catalyst enhanced the catalytic activity of Mn3O4 catalyst. Accordingly, K, Ca and Mg seemed to act as promoters, and the promoting effect might be ascribed to the defect-oxide or a hydroxyl-like group. A mutual inhibitory effect was observed between benzene and toluene in the binary mixture. In addition, the order of catalytic activity with respect to VOC molecules for single compound is benzene>toluene, and the binary mixture showed the opposite order of toluene>benzene. © 2010.
Electronics, Telecommunications Research Institute and Mokpo National University | Date: 2011-01-31
An apparatus for determining a fake image includes an image-acquiring block for acquiring an image captured by and input from a camera; and a background-learning block for learning a background of the image to create a learning background. Further, the apparatus for determining the fake image includes a face extracting-block for extracting a face region of a person to be authenticated when an input image for authentication is transmitted from the camera; and an inter-background comparing block for comparing a present background of an input image with the learning background. Furthermore, the apparatus for determining the fake image includes a motion information-comparing block for extracting motion information in the face region and the present background to compare the same with each other; and a fake image-determining block for determining whether the input image is faked using the compared results of the motion information and the backgrounds.
Kanmani P.,Mokpo National University |
Rhim J.-W.,Mokpo National University
Food Hydrocolloids | Year: 2014
Antimicrobial bionanocomposite films were prepared with gelatin and silver nanoparticles (AgNPs) and organoclay (Cloisite 30B) and their film properties were characterized. Transparency of nanocomposite films decreased, but UV barrier was greatly improved, which was more pronounced with AgNPs-included films. Hydrophobicity and water vapor barrier properties were also improved after formation of nanocomposite. The incorporation of AgNPs or clay into the gelatin film could affect the mechanical properties of films. Tensile strength (TS) increased significantly in the gelatin/clay and gelatin/AgNPs/clay films while decreased in the elongation at break (EB). EDX and XRD analysis were performed to examine the presence of elemental silver and crystallinity of AgNPs in the films. Microscopic surface structure analysis showed homogenous compact surface structure of the composite films. Interaction between the polymer and nanoparticles was tested by FT-IR analysis. The nanocomposite films, especially for gelatin/AgNPs/clay, exhibited strong antibacterial activity against food borne pathogens. These results suggested that the use of gelatin based nanocomposite films will help to compete and eliminate the bacterial invaders and to improve the shelf life and quality of food. © 2013 Elsevier Ltd.
Rhim J.-W.,Mokpo National University
Carbohydrate Polymers | Year: 2011
Agar/clay (Cloisite Na +) nanocomposite films with different amount of the nanoclay (0, 2.5, 5, 10, 15, and 20 g clay/100 g agar) were prepared using a solution intercalation method. Results on X-ray diffraction (XRD) and scanning electron microscopy (SEM) revealed well developed intercalated nanocomposite films especially at low level of nanoclay addition, and their properties were greatly influenced with the clay content. Tensile strength (TS) increased with increase in the clay content up to 10%, and decreased with more than 10% of clay incorporation. Water vapor permeability (WVP), water vapor uptake ratio (WVUR 5), and water solubility (WS) decreased with increase in the nanoclay content due to the tortuous path for water vapor diffusion and strong structure formed between the intercalated silicate layers and the polymer matrix. Hydrophilicity of the nanocomposite films increased with increase in the hydrophilic nanoclay, resulted in decreased water contact angle (CA) and increased swelling ratio (SR). © 2011 Elsevier Ltd All rights reserved.
Yoon C.,Mokpo National University
Computers in Human Behavior | Year: 2010
This study investigates the antecedents of customer satisfaction with online banking in China, and explores the effects of experience on the relationships between the antecedents and customer satisfaction. Based on prior research, the six antecedents of customer satisfaction-ease of use, design, speed, security, information content and customer support service-are proposed, and the effects of experience on the relationships between these and customer satisfaction are analyzed using a structural multi-group (a high-experience group and a low-experience group) model. The results show that design, speed, security, information content, and customer support service have a significant influence on customer satisfaction in the high-experience group or the low-experience group, but ease of use does not have a significant influence on customer satisfaction in either of the groups. Also, the results relating to the influence of the level of customer experience reveal that the effects of design, security, speed and information content on customer satisfaction were significantly higher in the high-experience group, whereas the effect of customer support service on customer satisfaction was significantly higher in the low-experience group. © 2010 Elsevier Ltd. All rights reserved.
Rhim J.-W.,Mokpo National University
Food Research International | Year: 2013
Multilayer films composed of PLA and agar/κ-carrageenan/clay (Cloisite® Na+) nanocomposite films were prepared, and the effect of lamination of PLA layers on the performance properties such as optical, mechanical, gas barrier, water resistance, and thermal stability properties was determined. The tensile strength (TS) of the agar/κ-carrageenan/clay nanocomposite films (67.8±2.1MPa) was greater than that of PLA films (43.3±3.6MPa), and the water vapor permeability (WVP), water uptake ratio (WUR), and water solubility (WS) of the nanocomposite films were higher than those of PLA films. The film properties of the multilayer films exhibited better properties of the component film layers. Especially, the WVP and water resistance of the bionanocomposite film were improved significantly, while the OTR of the PLA film decreased profoundly after lamination with PLA layers. Thermal stability of the bionanocomposite also increased after lamination with PLA layers. © 2013 Elsevier Ltd.
Mokpo National University | Date: 2013-06-05
The present invention relates to a silencer duct for a ships propeller using resonant barrels, wherein the ships propeller is surrounded by the silencer duct so as to deaden underwater noises of various frequencies generated by the propeller, the duct being made into a cylindrical form to surround the propeller arranged in the side or rear part of the ship so as to guide the fluid direction as the propeller rotates, and the inside of the duct being provided with a plurality of resonant barrels for damping resonant frequencies arranged in the form of nm (herein, n and m are natural numbers except 0) so as to damp the sound waves generated by the rotation of the propeller.
Mokpo National University | Date: 2011-12-14
Provided is a gastritis and gastric ulcer-treating agent, which is prepared and developed by processing solar salt and bamboo tree into heat-treated purple salt, in which the heat-treated salt, which is prepared by firstly heat-treating mineral rich solar salt and bamboo tree at a high temperature, that is, 1,100 C. or more; and two or more time repeating the heat-treating of the first heat-treated salt and bamboo tree under the above-described conditions, includes a large amount of hydrogen sulfide-producing material and has a purple color, and when the heat-treated salt is used along with aspirin, the heat-treated salt has an excellent effect on preventing stomach damage, thereby significantly reducing bleeding, ulcer, and the damage of mucous membrane, induced by aspirin.
Mokpo National University | Date: 2014-01-22
Provided is a functional composition for preventing an Alzheimers disease, in which the composition includes heat-treated salt that is heat-treated at 800 C. to 1200 C. as an effective component and other pharmaceutically or sitologically acceptable components. The composition can prevent an Alzheimers disease by effectively blocking the cause path of an Alzheimers disease in a human body.
Mokpo National University | Date: 2013-07-23
The present invention relates to a food composition comprising Suaeda japonica as an active ingredient for preventing or alleviating diabetes, and to a method for preparing the composition. When Suaeda japonica powder of the present invention is administered to OLETF mice in which obesity and diabetes are naturally induced during growth due to a defect of the CCK-1 gene, an increase in blood glucose and production of glycosylated hemoglobin are inhibited, and the effect of improving glucose tolerance is exhibited. Also, a high blood level of adiponectin, which relates to an improvement in insulin sensitivity and to the recovery of glucose metabolism function, is maintained, and antidiabetic activity, specifically, the effect of alleviating or preventing diabetes, is excellent.