• Korean Journal of Pharmacognosy
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• v.47 no.4
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• pp.374-380
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• 2016

The purpose of this study was to evaluate of quality variation of Sibujeondaebotang according to storage period and temperature (5 and $25^{\circ}C$) Identificaion test, pH, specific gravity, heavy metal, microbial limit test and glycyrrhizic acid, paeoniflorin content of Sibjeondaebotang were performed during 12 months. The significant change was not shown on identificaion test, specific gravity, microbial limit test under long term storage and the result suited a safe level standards of 'Korean National Standard of Traditional Medicinal (Herbal and Botanical) Materials - "Sibjeondaebotang"'. The test of pH showed meaningful changes between two storage temperature (5 and $25^{\circ}C$) according to increasing storage period. The contents of glycyrrhizic acid and paeoniflorin had no relation with storage temperature($5^{\circ}C$, $25^{\circ}C$) but it showed a tendency to decrease according to the length of storage period. We predicted shelf-life of glycyrrhizic acid and paeoniflorin at storgae temperature(5 and $25^{\circ}C$) as about 6 and 3 months, respecttively. Therefore considering glycyrrhizic acid and paeoniflorin, sibjeondaebotang is determined to be in good condition within 3 months, regardless of the room temperature and refrigerated temperature. We were expected to serve as a basis for the guideline of medication counseling sibjeondaebotang.

• International Journal of Safety
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• v.9 no.1
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• pp.43-46
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• 2010

In the recycle process of organic solvent, the atmospheric oxygen can cause autoxidation and product peroxide. The time-saving method to evaluate the hazards has been required. In this study, oxygen pressure monitoring experiment was proposed as a new method to evaluate autoxidative resistances of solvents. Some of organic solvents were pressurized by oxygen and kept under isothermal condition. At the same time, the pressure in the vessel tracked. Iodometrical titration, thermal analysis and spectroscopic analysis were performed to measure peroxide concentration, the heat of reaction and chemical bonding change. From the results that THF has larger oxygen consumption rate than CPME, it is considered that autoxidative resistance of THF is lower than that of CPME. This method enables to obtain results in shorter time than other methods. These experimental results were consistent with the previous research with longer test durations [1-2].

• Proceedings of the Korean Society of Applied Entomolohy Conference
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• 2004.05a
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• pp.119-119
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• 2004

• KSBB Journal
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• v.28 no.4
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• pp.217-224
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• 2013

A bacterium CGH18 exhibiting antioxidizing and chitin-degrading activities in the colloidal chitin culture medium was isolated from salt-fermented crab. This strain was identified as Bacillus idriensis based on 16S rDNA sequence homology search. Its crude extract was partitioned between n-BuOH and $H_2O$. The organic layer was further partitioned between $CH_2$ $Cl_2$ and $H_2O$. Antioxidant activities of crude extract and its solvent fractions were evaluated using five different bioassay methods, including the degree of occurrence of intracellular reactive oxygen species (ROS), peroxynitrite scavenging (ONOO), and oxidative damage of genomic DNA. All fractions exhibited significant antioxidant activity in bioassay systems used.

• Proceedings of the Korean Society of Applied Entomolohy Conference
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• 2004.05a
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• pp.118-118
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• 2004

• Analytical Science and Technology
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• v.28 no.3
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• pp.212-220
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• 2015

This study aims to identify the characteristics of phthalates (DMP, DEP, DBP, DEHA, BBP, DEHP, and DNOP) and heavy metals such as lead (Pb), cadmium (Cd), and mercury (Hg) in cosmetics and their containers. Phthalates and heavy metals may be endocrine distruptors. Sixty-five cosmetics were purchased from online and offline stores in Busan. This study developed a simultaneous method for the analysis of phthalates by GC-FID. The results showed that among the 65 cosmetics, DBP, DEHP, and DEP were detected at 20.0%, 7.7%, 1.5%, respectively. The amounts of DBP and DEHP detected in 18 samples were less than 100 μg/g, which satisfies the Regulations of Cosmetic Safety Standards in Korea. In order to detect phthalates in cosmetic containers, a dissolution test was conducted by extracting solutions, such as water, n-heptane, 20% ethanol, 50% ethanol and 4% acetic acid, which were prepared with different levels of pH, alcohol content, and fat content following the Korea Standards and Specifications for Utensils, Containers, and Packaging. The results showed that DMP, DBP, DEHA, BBP, DEHP, and DNOP were not detected, DEP was detected in plastics such as PE, PP, and others, when a 50% alcohol solvent was used. Phthalates may not be detected in cosmetic containers if they are not packaged with the above 20% alcohol constituent. We also analyzed the concentration of heavy metals, such as Pb, Cd, and Hg, by using ICP-OES and a mercury analyzer. The ranges of concentration were ND~2.71 μg/g for Pb, ND~0.31 μg/g for Cd, and ND~0.01 μg/g for Hg, which are below the regulated level.

• 한국정보디스플레이학회:학술대회논문집
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• 2006.08a
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• pp.854-857
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• 2006

The synthesis of ester type, banana-shaped, photo - crosslinkable mesogens is described. The reactive mesogens, derivatives of 1,3-phenylene bis{4-[4'- (alken-1-yloxy)-biphenyl-4-carboxylate]benzoate}s, were synthesized varying the length of alkyl end groups. The obtained monomers and polymers were characterized by FT/IR, NMR spectroscopy, DSC, polarized optical microscopy, and X-ray diffractometry.

• Electronics and Telecommunications Trends
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• v.22 no.5
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• pp.152-158
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• 2007

Secure execution environment는 안전한 컴퓨팅 시스템의 실행환경을 의미한다. 컴퓨터 시스템을 포함해서 프로세서를 가지고 있는 모든 종류의 단말이 secure execution enviroment 관련 연구의 대상이 될 수 있다. 기본적인 컴퓨팅 환경의 보안 수준을 높여주는 secure execution enviroment는 이미 많은 연구가 진행된 분야로 본 문서에서는 이와 관련된 연구 및 기술개발 동향에 대해서 알아본다. 또한 대학교에서 진행된 대표적인 프로젝트와 프로세서 제조업체의 기술 동향 및 관련된 산업 표준화 동향을 살펴보고 비교 분석하는 것을 목표로 한다.

• Proceedings of the Korean Institute of Resources Recycling Conference
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• 2004.05a
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• pp.31-35
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• 2004

• Journal of Life Science
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• v.20 no.3
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• pp.365-373
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• 2010

To monitor newly emerged influenza virus variants and to investigate the prevalence pattern, our laboratory performed isolation of the viruses from surveillance sentinel hospitals. In the present study, we analysed influenza A/H1N1, A/H3N2, B viruses isolated in Busan during the 2006/07 and 2007/08 seasons by sequence analysis of the hemagglutinin (HA1 subunit) and neuraminidase (NA) genes. The isolates studied here were selected by the stratified random sample method from a total of 277 isolates, in which 15 were A/H1N1, 16 were A/H3N2 and 29 were B. Based on the phylogenetic tree, the HA1 gene showed that A/H1N1 isolates had a 96.7% to 97.7% homology with the A/Brisbane/59/2007, A/H3N2 isolates had a 98.4% to 99.7% homology with the A/Brisbane/10/2007, and B isolates had a 96.5% to 99.7% homology with the B/Florida/4/2006(Yamagata lineage), which are all the vaccine strains for the Northern Hemisphere in 2008~2009 season. In the case of the NA gene, A/H1N1 isolates had 97.8% to 98.5% homologies, A/H3N2 isolates had 98.9% to 99.4% homologies, and B isolates had 98.9% to 100% homologies with each vaccine strain in the 2008~2009 season, respectively. Characterization of the hemagglutinin gene revealed that amino acids at the receptor-binding site and N-linked glycosylation site were highly conserved. These results provide useful information for the control of influenza viruses in Busan and for a better understanding of vaccine strain selection.