• Food Science and Preservation
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• v.12 no.5
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• pp.424-431
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• 2005

'Hongro' and 'Gamhong' apples grown at the Gochang-si in the southern part of Korea were harvested on September in 2002 for storage study. Each cultivar was divided into two groups of maturity based on the harvested date. Immature fruits were harvested 10 days early compared to fruits having proper maturity. This study was conducted to evaluate quality the change of 'Hongro' and 'Gamhong' apples newly bred by different storage methods with PE film package and CA conditions. A typical climacteric respiration pattern was observed in new variety 'Hongro' and 'Gamhong' apples stored at room temperature. The results indicated that fresh quality of the stored fruits in CA condition was better than that in other treatments during storage. Qualities of apples were least changed at CA storage of 3% $CO_2$ and 1% $O_2$. CA storage was effective in maintaining the freshness of 'Hongro' and 'Gamhong' for 16 weeks.

• Composites Research
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• v.23 no.3
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• pp.64-68
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• 2010

Expanded polystyrene(EPS) foams are often used in packaging to protect electrical appliances from impact loads. The energy absorbing performances of the EPS foams depend on several parameters such as density, microstructure and strain rate. Thus, the effects of the parameters on the strength of the EPS foams need to be investigated for an optimized packaging design by FEM. In this study, various EPS foams which have different densities were quasi-statically and dynamically loaded in order to obtain the stress-strain curves. EPS foams of various densities from 18.5 to 37.0kg/m3 were considered in the experiments. A drop-mass type apparatus was developed for the intermediate strain rate tests up to several hundreds/second. It was found from the experimental results that the strength of the EPS foams increase about 170% as the strain rate increases from 0.06/s to 60/s. Experimental results also showed that the strain rate sensitivity increases as the strain increases.

• Korean Journal of Food Science and Technology
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• v.26 no.3
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• pp.250-254
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• 1994

The quality characteristics of freeze-dried Chungkook-jang soup, stored at $25^{\circ}C$, $35^{\circ}C$ and $45^{\circ}C$ was investigated. Peroxide value(POV) was increased as the storage time was extended. Browning reaction occured earlier in the sample stored at $45^{\circ}C$ than those stored at $35^{\circ}C$ and $25^{\circ}C$. Red color developed more intensely in the sample stored at $45^{\circ}C$. However, moisture content was not changed during storage. Regression analyses between sensory scores and quality characteristics showed that the peroxide formation of oil contained in Chungkook-jang soup was the major quality index for the deterioration of Chungkoak-jang soup.

• Journal of Korean Society of Transportation
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• v.24 no.2 s.88
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• pp.79-89
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• 2006

The purpose of this study is to propose a new method using the GPS-INS integrated system which measures the superelevation of a curved yoad rapidly and safely Also, using the CPS-INS integrated system. this Paper is to analyze the expected accuracy of the superelevation on the roads which are already opened for traffic. The superelevation of the roads which are already opened for traffic often changes by roads rehabilitation work such as resurfacing of Pavement and rutting However, it is difficult to measure 1,he changes of road geometry because or the high cost and the safety problem. If the measurement of superelevation using GPS-INS integrated system is used instead of existing conventional surveying method, the superelevation of road is expected to be measured accurately(under 0.4% RMSE) just by driving without interfering the traffic Therefore, the application of the GPS-INS integrated system is expected to be useful tool for measuring the superelevation of the roads.

• Journal of Korea Technical Association of The Pulp and Paper Industry
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• v.35 no.2
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• pp.52-57
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• 2003

The charcoal is known to have gas adsorption capability and electrical properties. Some practical applications of carbon materials for the purpose of limited electrical conduction were made in these days. In this paper, we applied the several different kinds of charcoal to the papers in three different ways to investigate if charcoal application method affects its electrical conduction capability. Wet end addition, making multiply, and coating method were tested. The area electrical resistivity of charcoal containing paper was measured. The strength properties of charcoal containing paper were compared to those of the control, which had no charcoal in it. Experimental results showed that manufacturing conditions of the charcoal itself changed its electrical and strength properties of charcoal containing paper. The electrical properties of charcoal containing paper can be used for the removal of electrostatic problem in packaging system. The strength property of the charcoal containing paper should be kept, at least, over the minimum requirement for the packaging system. By using coating method on paper or making multiply, strength loss of paper by inclusion of charcoal could be overcome.

• Journal of the Korean Society of Environmental Restoration Technology
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• v.15 no.4
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• pp.97-109
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• 2012

In this study this writer carried out survey and analysis on paving materials of children's playground for 40 apartment buildings with each of such apartment containing 100 households or more and which were built within last 15 years in Jeonju. As a result of analysis of such questionnaires this author could draw following conclusion. In the second half of 1990s pavement materials which were used mainly were sand and during first half of 2000s they were mixture of sand and rubber block and around 2010 they were rubber block or rubber chip pavements. Such change seemed to be a result of consideration of convenience for management and safety rather than in deference to diversity of children's outing places. Survey on the current status of pavement materials revealed need for directives by the main entity for management and their firm resolve for its implementation. And there was need for their coping with problems such as pressure of treading or lack of it or poor condition of drainage in case of sand and phenomena of pitting or dipping down, discoloring and poor drainage in case of rubber chips and rubber blocks and loosening of gaps between rubber blocks etc. Result of analysing status of usage disclosed that 50.4% of the respondents to questionnaires stated that they had experience of accidents. With regard to cause of such accident it was found that 47.5% of accidents were attributable to play facilities and 19.5% were due to paving (floor) materials thus it was disclosed that not only play facilities but also pavement materials had impact on safety for the children. Result of analysing level of satisfaction with pavement materials showed that pavement by rubber chips and blocks had higher level of satisfaction which was reflection of fear on cleanness of sand. In terms of preference rubber chip and rubber block pavements were highest and the next one was sand. Reason for such preference was based on concern with safety.

• Journal of Digital Convergence
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• v.18 no.9
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• pp.343-349
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• 2020

This study is cases study of sustainable eco-friendly cosmetics packages. The importance of eco-friendly packages has been increasing as environmental issues have recently emerged around the world. Domestic cosmetics industry are releasing sustainable package designs with these changes, but they are limited. In this study, sustainable package criteria were divided and analyzed based on each of the five prior studies of domestic and foreign cases. Studies have confirmed that there is no diversity in the materials and designs of sustainable packages in Korea compared with other countries. Also, it could be seen that there was the lack of consumer-led eco-friendly campaigns. Starting point of research, it is expected that this study may help continue to study better sustainable cosmetics packages in the future.

• The Korean Journal of Community Living Science
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• v.16 no.4
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• pp.15-24
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• 2005

We investigated the changes of volatile flavor components from Codonopsis lanceolata, which were packed in woven polypropylene(WP) film or low density polyethylene(LDPE) film and stored for 15 and 30 days at refrigerated($2{\∼}4^{\circ}C$ ) or room($18{\∼}20^{\circ}C$) temperature. A hundred and sixty seven volatile flavor components in the fresh C. lanceolata were identified by GC/MS analysis. When determining the flavor components from C. lanceolata cultivated on a wild hill and stored at 4 conditions for 30days, six volatile components such as 1-hexadecene, 2,6-dimethyl-2-octanol, 2-methyl-2-dodecanol, $\alpha$-guaiene, $\delta$-cadinene and trans-2-hexen-1-ol were detected as common components of all stored samples, and The types of common flavor components of C. lanceolata were different according to storage conditions. The numbers were 16 from refrigerated, 7 from room temperature stored, and 10 components from WP or LDPE packed conditions, respectively. The total peak area ratio of the major 10 compounds were $52.0{\∼}86.8\%$, and the percentage of trans-2-hexen-1-ol, which was the only common compound among the major 10 components, was the highest as $26.4{\∼}68.1\%$ The major flavor profile, describe by highly trained panel, were green, aldehydic, earthy and camphoreous. As the result from sensory evaluation, the freshness of C. lanceolata was maintained better by controlling storage temperature rather than selection of package materials. The best condition for characteristic flavor of C. lanceolata was packing with LDPE and chilling.

• Food Science and Preservation
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• v.16 no.1
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• pp.134-137
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• 2009

The gelatin film containing grapefruit seed extract (GSE) was prepared by incorporating different amounts (0, 0.02, 0.05, 0.08, 0.1%) of GSE into the film. The tensile strength (TS) of the film increased by the addition of GSE, and water vapor permeability (WVP) of the film decreased. In particular, the gelatin film containing 0.1% GSE had a TS of 10.28 MPa, while the control had 8.68 MPa. WVP of the film containing 0.1% GSE decreased to 2.18 ng m/m2 s Pa, compared to 2.48 ng $m/m^{2}s$ Pa of the control. In addition, incorporation of 0.1% GSE to the gelatin film decreased the populations of Escherichia coli O157:H7 and Listeria monocytogenes by 2.67 and 3.15 log CFU/g, respectively, compared to the control. These results suggest that as a packaging material, gelatin film containing GSE can have antimicrobial activity against pathogenic microorganisms in foods.

• Korean Journal of Food Science and Technology
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• v.47 no.2
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• pp.224-232
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• 2015

The effects of cold plasma (CP) treatments on the physicochemical and biodegradable properties of a corn biomass-containing polyester (CBPE) film were studied. The CBPE film was treated with CP generated by $N_2$, $O_2$, He, Ar, or dry air at 400-900 W and 667 Pa for 10-40 min. The glass transition temperature of the CBPE film ($-30.2--28.6^{\circ}C$) was not affected by the CP treatment, while the elastic modulus and water vapor permeability decreased (p<0.05). The ink printability was improved by the treatment and the improved printability was maintained during storage for 56 days at room temperature. Roughness of the film increased after treatments and the level of roughness appeared to increase during storage. Heat and microbial biodegradability of the CBPE film was improved by the air-CP treatment (p<0.05). These results have demonstrated the potential of applying CP treatments to improve the flexibility, printability, and biodegradability of CBPE films.