• Journal of the Korean Institute of Gas
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• v.21 no.3
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• pp.9-16
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• 2017

Toxic release is one of the most interested area in evaluating consequence to the vicinity of industry facilities handling hazardous materials. Chloric acid production facility is selected and toxic release is evaluated to assess the risk impacted to its off-site. Accident scenarios were listed using process safety information. The scenarios having effect to the off-site were selected and assessed further according to guideline provided by Korea government. Worst case and alternative scenarios including other interested scenarios were evaluated using ALOHA. Each evaluated scenario was assessed further considering countermeasures. The results showed that the facility handling chloric acid is safe enough and needed no further protections at the moment.

• Journal of Power System Engineering
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• v.2 no.1
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• pp.80-85
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• 1998

Engineering plastics have been magnified its usability due to its outstanding mechanic al, electrical and chemical properties, for example, in the area of computer, electricity, electronics, automobile, camera industry. In recent, automobile speedometer system is changing from manual operation to motor operation. All plastic gears inserted by metal shaft are used In motor operated speedometer system. Therefore, in this research, experimental investigation of the shrinkage phenomenon was executed according to various inserted depth and injection conditions. In experiments, the inserted depth was controlled as 30% and 90% of the total thickness of the plastic gear. The main parameters of injection process were selected as injection pressure, holding pressure, melt temperature, injection rate. As main results, free shrinkage rate of the test part is increased about 4 times to restricted shrinkage rate and shrinkage phenomenon against all injection conditions have a trivial effect on the test parts as conventional parts.

• Proceedings of the Korea Society of Information Technology Applications Conference
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• 2006.06a
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• pp.345-354
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• 2006

고객관계관리는 많은 기업들에게 경영자와 차별화할 수 있는 부문으로서 인식되어 왔다. 수익성 높은 고객을 확보하고 유지하는 것이 매우 중요하기 때문이다. 기업의 핵심역량으로서 고객관계관리를 강화하기 위해서는 고객정보를 더욱 효과적으로 관리해야 한다. 본 연구는 고객정보관리 활동들과 그에 영향을 마치는 영향요인들을 살펴보고, 고객정보 관리 충실도와 고객정보 품질 간의 관계를 보인다. 또한, 고객정보관리 활동에 영향을 미치는 영향요인과 고객정보 품질 사이에서 고객정보관리 프로세스 충실도가 매개효과를 나타냄을 증명한다. 설문을 통해 얻은 65개 기업의 자료를 바탕으로 다중회귀분석과 ANOVA를 실시해 가설에 대한 실증 분석을 하였다. 분석 결과 6개의 고객정보관리 활동들과 이러한 고개정보관리 프로세스에 대한 5개의 영향요인을 발견하였다. 고객정보관리 프로세스의 충실도는 고객정보 품질과 밀접한 관계를 보였고, 영향요인과 고객정보 품질 사이에서 고객정보관리 프로세스의 충실도가 매개 역할을 수행함을 밝혀내었다. 마지막으로 본 연구의 의의와 결론, 향후 연구방향을 제시하였다.

• Journal of Surface Science and Engineering
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• v.32 no.3
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• pp.428-432
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• 1999

As metallic surface has its unique lustrous appearance and optical reflectance in visible range of light, the metallization of plastic surface has been an essential drive toward weight reduction for fuel economy and decorations in transportation industry and has been put into practiced from wet chemical-electrochemial to dry vacuum process in view of an environmental effect. Electron-beam metallization was used in this work with an aim at improving the scratchproof surface hardness of plastic substrate with metallic finish character. Thin film of Al ($1000\AA$) and $SiO_2$($7000\AA$) were metallized on substrate of PC and PMMA and the films were evaluated by pencil test for surface hardness and by cross-cut tape test for adhesion. The ion beam treatment improved around twice as hard as non-treat surface. The ion beam is effect on its hardness and adhesion to surface hardened PC substrate.

• Journal of agriculture & life science
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• v.44 no.1
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• pp.9-15
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• 2010

Barley, a monocotyledonous plant, is relatively recalcitrant to the process of Agrobacterium-mediated genetic transformation. In this study, seedlings of six barley cultivars (Keunal-1-Ho, Saessal, Ol, Saechalssal, Seodunchal and Pungsanchalssal) were injured using alkali, oxidizing or reducing agents. They were then transformed using Agrobacterium via vacuum infiltration for the analysis of comparative GUS gene expression. It was determined that chemical injuries causing a slight growth retardation could overall enhance the GUS transformation rate. Hydrogen peroxide was determined to be the most effective.

• Journal of Environmental Health Sciences
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• v.45 no.4
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• pp.321-325
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• 2019

The recent humidifier disinfectant disaster has caused a great change in our society and lead the Korean people to lose faith in the government and corporations. To overcome this mistrust, the government and corporations have undertaken certain efforts, including a voluntary agreement on consumer product safety. All the ingredients of a consumer product should be disclosed according to this voluntary agreement. There were also unexpected benefits occuring from this process. We found that the concept of corporate responsibility for product safety differed greatly among the various actors in Korean society. Corporations believed that a product could be considered safe if it contained no regulated substances. We have come to believe that this may be an important cause of the humidifier disinfectant disaster. The Korean government, corporations, and civil organizations have reached a consensus that it is a corporation's responsibility to evaluate the risks of products before they are introduced to the market. However, the limitations of these voluntary efforts are clear, and the legal system needs to be improved. We suggest that the concept of extreme recklessness should be introduced into regulations on product safety.

• Journal of Microbiology and Biotechnology
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• v.29 no.7
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• pp.1053-1060
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• 2019

Thermal drying is a common process used in the food industry for the modification of agricultural products. However, while various studies have investigated the alteration in physiochemical properties and chemical composition after drying, research focusing on the relationship between different dehydration conditions and bioactivity is scarce. In the current study, we prepared dried ginger under nine different conditions by varying the processing time and temperature and compared their immunomodulatory effects. Interestingly, depending on the drying condition, there were significant differences in the immunestimulating activity of the dried ginger samples. Gingers processed at $50^{\circ}C$ 1h displayed the strongest activation of macrophages measured by $TNF-{\alpha}$ and IL-6 levels, whereas, freezedried or $70^{\circ}C$- and $90^{\circ}C$-dried ginger showed little effect. Similar results were recapitulated in primary bone marrow-derived macrophages, further confirming that different dehydration conditions can cause significant differences in the immune-stimulating activity of ginger. Induction of ERK, p38, and JNK signaling was found to be the major underlying molecular mechanism responsible for the immunomodulatory effect of ginger. These results highlight the potential to improve the bioactivity of functional foods by selectively controlling processing conditions.

• Journal of Conservation Science
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• v.35 no.1
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• pp.51-60
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• 2019

This paper provides quantitative data that describes the evolution of the air quality in the Whale and Sea Museum, located in the Iwate prefecture, collected after the 2011 Great East Japan Earthquake and tsunami. The museum was damaged significantly by the disaster, and restoration works continued for over six years. The air quality in the temporary storage facility and museum was monitored during the rehabilitation process. Evaluation of air quality is carried out by gas chromatography- mass spectrometry, ion chromatography and high-performance liquid chromatography. The results showed that the characteristics of the chemical components differed depending on the measurement locations inside the building. The museum atmosphere tended to be alkaline as the airtightness increased because of the maintenance works at the entrance. It was also determined that it was necessary to study the intake/exhaust routes and to clean them according to the contamination degree. In Japan, there are recommended museum air quality standards for acetic acid, formic acid, alkali, and aldehydes. The results indicated that these standards should not be used as a reference for damaged museums. Furthermore, at the temporary storage facilities for to store the collections during the rehabilitation of the museum, solvents such as ethyl benzene, toluene, and xylene are initially abundant, although they can be reduced by ventilation, while other components such as 2E1H was confirmed in this case are likely to remain.

• Food Science and Industry
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• v.49 no.2
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• pp.34-44
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• 2016

Given that fermented foods, such as kimchi and doenjang, are main food sources for high sodium intake in Korea, there have been needs to develop sodium-reduced kimchi and doenjang with the proper quality. However, small and medium sized business could not actively develop the sodium-reduced products due to lack of techniques and information as well as economical reasons. The most important aspects is to address food safety issues including microbial contaminations in sodium-reduced foods. Hurdle Technology, physical, biological, chemical control technique, would have to be preferentially considered to increase the hygiene safety standards in entire processing steps including raw materials, process water, manufacturing environments, and so on. Once the food hygiene level is stable, the next challenges are to improve the taste of the sodium reduced-products as well as to packaging and storage technologies. The development of a variety of sodium-reduced fermented foods would result in significant mitigation of sodium intake by Korean. This report provides the directions to develop sodium-reduced kimchi, doenjang or pickled food products for small and medium sized business, based on the technical consulting results of sodium reduction project supported by Ministry of Food and Drug Safety in 2015.

• Design & Manufacturing
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• v.15 no.4
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• pp.57-64
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• 2021

In recent materials industry, researches on the technology to manufacture super hydrophobic surface by effectively controlling the wettability of solid surface are expanding. Research on the fabrication of super hydrophobic surface has been studied not only for basic research but also for self-cleaning, anti-icing, anti-friction, flow resistance reduction in construction, textile, communication, military and aviation fields. A super hydrophobic surface is defined as a surface having a water droplet contact angle of 150 ° or more. The contact angle is determined by the surface energy and is influenced not only by the chemical properties of the surface but also by the rough structure. In this paper, maskless lithography using DMD, electro etching, anodizing and hot embossing are used to make the polymer resin PMMA surface super hydrophobic. In the fabrication of microstructure, DMDs are limited by the spacing of microstructure due to the structural limitations of the mirrors. In order to overcome this, maskless lithography using a transfer mechanism was used in this paper. In this paper, a super hydrophobic surface with micro and nano composite structure was fabricated. And the wettability characteristics of the micro pattern surface were analyzed.