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허찬,김현욱,최윤상,김천제,백현동,Heo, Chan,Kim, Hyoun-Wook,Choi, Yun-Sang,Kim, Cheon-Jei,Paik, Hyun-Dong Korean Society for Food Science of Animal Resource 2009 한국축산식품학회지 Vol.29 No.1
Predictive modeling was applied to study the growth of microorganisms related to spoilage in frankfurter sausage containing various levels of dietary fiber (0, 1, 2, and 3%) from rice bran and to estimate its shelf-life. Using the Baranyi model, total viable cells, anaerobic and psychrotrophic bacteria were measured during 35 days of cold storage ($<4{\pm}1^{\circ}C$). The lag times (LT) demonstrated by control and treatment groups were 6.28, 623, 6.24, and 6.25 days, respectively. The growth rate of total viable cells in each group were 0.95, 0.91, 0.92, and 0.91 (Log CFU/g/day), respectively. The anaerobic and psychrotrophic bacteria had lower initial ($y_0$) and maximal bacterial counts ($y_{max}$) than total viable cells. Also, the anaerobic and psychrotrophic bacteria possessed lower growth rate and longer lag time than total viable cells. The estimated shelf-life of frankfurter containing rice bran fiber by the growth rate of total viable cells was 7.8, 7.9, 7.9, and 7.7 days, respectively. There were no significant differences in shelf-life as a function of fiber content. In other words, the addition of dietary fiber in sausage did not show the critically hazardous results in growth of microorganism. The 12 predictive models were then characterized by high $R^2$, and small RMSE. Furthermore, $B_f$ and $A_f$ values showed a very close relationship between the predictive and observed data.
예측미생물학을 활용한 미강 식이섬유 함유 떡갈비의 유통기한 설정
허찬,김현욱,최윤상,김천제,백현동,Heo, Chan,Kim, Hyoun-Wook,Choi, Yun-Sang,Kim, Cheon-Jei,Paik, Hyun-Dong 한국축산식품학회 2008 한국축산식품학회지 Vol.28 No.2
The objective of this study is to estimate the shelf-life of Tteokgalbi containing dietary fiber extracted from rice bran by using the predictive microbiology. This Tteokgalbi was made with 0%, 1%, 2%, and 3% dietary fiber. The number of total viable cells, anaerobic, psychrotrophic, and heat-stable bacteria and coliforms was calculated during 15 days of storage under $4{\pm}1^{\circ}C$ and the obtained data was applied to Baranyi function. The evaluation of fitness between predicted and observed data showed that these were matched in a satisfactory way. Heat-stable bacteria was detected lower than <1 log CFU/g and coliforms were not detected during the storage. The changes of total viable cells and psychrotrophic bacteria in Tteokgalbi were increased gradually, but dramatically increased after 3 days of storage. The models of total viable cells and anaerobic bacteria showed very similar growth trends and values of growth parameters each other. The estimated shelf-life of each Tteokgalbi was calculated from the predictive model of total viable cells and the estimated shelf-life was 1.7, 2.3, 2.3, and 2.4 days, respectively. The results suggested that the prediction of bacteria growth could be used to evaluate the microbiological safety and determine the shelf-life of Tteokgalbi as ready-to-eat food in the local market.
허찬(Chan Heo),김남이(Nam Yee Kim),김현표(Hyun Pyo Kim),허문영(Moon Young Heo) 대한약학회 2005 약학회지 Vol.49 No.3
The ethanol extracts of the mixed vegetables (Bioactive Vegetables, BV) and the mixed fruits (Bioactive Fruits, BF) were evaluated for their in vivo antioxidant activities. Four weeks treatment of oral administration was performed to mice. A KBrO3, as a potent oxidant was used to induce the oxidative stress for in vivo experiment. BV and BF were shown to possess the significant inhibitory effect of lipid peroxidation as measured by the level of malondialdehyde (MDA) formation although the potencies were not higher than those of well-known antioxidants such as vitamin C, trolox and quercetin. Furthermore, BV and BF inhibited DNA damage assessed by single cell gel electrophoresis (comet assay) and reduced the micronucleated reticulocyte (MNRET) formation of peripheral blood. Antioxidants tested also revealed potent inhibitory activities higher than BV and BF. These antigenotoxic activity profiles were similar to that of aboveentioned inhibition of lipid peroxidation. Therefore, BV and BF having mild antioxidant activity as functional food candidates may be useful natural antioxidants by the inhibiting of lipid peroxidation and the protecting oxidative DNA and chromosomal damage.
담배연기응축물의 DNA 손상작용과 야채 및 과일추출물의 보호효과
이형주(Hyeong Ju Lee),허찬(Chan Heo),김남이(Nam Yee Kim),허문영(Moon Young Heo) 대한약학회 2011 약학회지 Vol.55 No.3
Cigarette smoke condensate (CSC) is known to be carcinogenic compound. CSC contains many organic compounds such as polycyclic aromatic hydrocarbons (PAHs), and heterocyclic amine compounds (HCAs). Reactive oxygen species(ROS) are also generated and induce oxidative DNA damage during the metabolism of CSC. The rat microsome mediated and DNA repair enzyme treated comet assays together with conventional comet assay were performed to evaluate the mechanisms of CSC genotoxicity. The organic extract of CSC induced oxidative and microsome mediated DNA damage. Vitamin C as a model antioxidant reduced DNA damage in endonuclease III treated comet assay. One of flavonoid, galangin as a CYP1A1 inhibitor, reduced DNA damage in the presence of S-9 mixture. The ethanol extracts of the mixed vegetables (BV) or the mixed fruits (BF) showed potent inhibitory effects against CSC induced DNA damage with oxidative DNA lesions and in the prescence of S-9 mixture. These results indicate that BV and BF could prevent CSC-induced cellular DNA damage by inhibiting oxidative stress and suppressing cytochrome P450 in mammalian cells.
입자결합모델을 이용한 횡등방성 암석에서의 수압파쇄 특성 연구
정재웅(Jaewoong Jung),허찬(Chan Heo),전석원(Seokwon Jeon) 한국암반공학회 2013 터널과지하공간 Vol.23 No.6
수압파쇄는 암반에서 유체의 흐름을 촉진시키기 위한 방법으로 사용되며 지열개발, 세일가스의 개발 등 최근 에너지 분야에서 그 어느 때 보다 활발한 연구가 이루어지고 있다. 수압파쇄의 대상이 되는 암반은 등방성을 갖지 않는 경우가 대부분이며 일부 퇴적암층에서는 횡등방성 암반에서 수압파쇄가 이루어진다. 횡등방성 암반에서는 수압파쇄에서 발생하는 균열의 성장 방향이 반드시 최대주응력 방향과 일치하지 않으며 이방성 구조에 따라 변화하게 된다. 그러므로 이 연구에서는 입자결합모델을 이용하여 횡등방성 암석에서의 수압파쇄 특성을 고찰하고 분석하고자 하였다. 또한 실험실 규모의 수압파쇄 실험을 실시하여 수치해석 결과의 타당성을 분석하고자 하였다. 본 연구에서는 가압되는 유체의 점도 및 층리면의 각도 그리고 이방성에 의한 영향으로 균열의 성장 및 균열 패턴에 큰 차이를 보였으며, 횡등방성 모델의 경우 전단균열에 의한 수압파쇄 균열의 성장이 우세한 것으로 나타났다. Hydraulic fracturing is used as a method for promoting the fluid flow in the rock and, in the energy field such as geothermal development and the development of sales gas, many studies has been actively conducted. In many cases, hydraulic fracturing is not performed in isotropic rock and especially in the case of sedimentary rocks, hydraulic fracturing is conducted in the transverse isotropic rock. The direction of the crack growth on hydraulic fracturing does not necessarily coincides with the direction of maximum principal stress in the transverse isotropic rock. Therefore, in this study, bonded particle model with hydro-mechanical coupling analysis was adopted for analyzing the characteristics of hydraulic fracturing in transverse isotropic rock. In addition, experiments of hydraulic fracturing were conducted in laboratory-scale to verify the validity of numerical analysis. In this study, the crack growth and crack patterns showed significant differences depending on the viscosity of injection fluid, the angle of bedding plane and the influence of anisotropy. In the case of transverse isotropic model, the shear crack growth due to hydraulic fracturing appeared prominently.
건설기업의 Scope 3 탄소배출량 산정 범위에 대한 고찰
송준오(Song, Jun-Oh),허찬(Heo, Chan),박문서(Park, Moon-Seo),안창범(Ahn, Chang-Bum) 대한건축학회 2024 대한건축학회논문집 Vol.40 No.2
In October 2018, the Intergovernmental Panel on Climate Change (IPCC) recommended limiting global warming to 1.5C and proposed achieving net-zero carbon emissions by 2050. Since then, many countries have declared their commitment to achieving net-zero emissions. Korean government has set a national greenhouse gas reduction target of 40% by 2030 from 2018 levels. Construction companies in Korea are making efforts to calculate their carbon emissions internally for this purpose. However, they are not sufficiently accounting and reporting carbon emissions related to Scope 3 within the construction industry value chain. This research analyzes sustainable management reports of construction companies to identify case studies of Scope 3 carbon reduction and to derive the Scope 3 categories currently being presented. Next, based on survey data provided by the Carbon Disclosure Project (CDP), criteria are established for 1)Amount of emissions, 2) Relevance of data, and 3)Ease of calculation and reliability. The collected data is used to calculate scores for each Scope 3 categories based on the three criteria, and suggest five categories that had highest total score among categories. Using these recommended categories, carbon emissions of over 90% in the construction project value chain are expected to be calculated. In conclusion, the study provides valuable insights into Scope 3 emissions reduction strategies in the construction industry, with a focus on domestic companies. A guideline from scope 3 categories selected by three different evaluations will help companies that evaluate environmental performance and impact investors to have a more objective standard compared to existing methods.