• Journal of the Korea Academia-Industrial cooperation Society
• /
• v.18 no.4
• /
• pp.599-607
• /
• 2017

Since 2015, small and medium domestic enterprises that treat more than a certain quantity of chemical substances in accordance with the Chemical Substance Control Act are obliged to submit an off-site impact assessment and risk management plan. In order to reduce the administrative and economic burden of the risk assessment, its impact was determined. Toxic leaks of nitric acid, methanol, and acetic acid were estimated and the correlations (between them?) were calculated. In addition, the correlations of this study were used to compare the KORA results according to the accident scenarios of the actual workplace and the extent of the damage as a function of distance in the case of toxic leaks. In this study, the correlation formula of the materials can be used to quickly determine the damage distance in the event of the accidental leakage of materials in the road or workplace, and to prepare emergency plans and respond to emergencies more quickly.

• Korean Journal of Fisheries and Aquatic Sciences
• /
• v.32 no.5
• /
• pp.649-653
• /
• 1999

A magnetic fluid separation technology was confirmed to be very effective to remove the suspended solids (SS) from aquacultural recirculating water, In this study, the effects of operating variables on the characteristics of SS removal were investigated through the test runs using magnetite of 2 $\mu$m mean diameter as magnetic powder. Magnetic flocculation here formed by adsorbing fine magnetites on the surface of suspended solid was observed. The strength of magnet was of significance in determining the SS removal efficiency as well as the capacity of the equipment. In addition, the SS removal efficiency decreased with an increase in the superficial liquid velocity, but the effect became negligible when the mass ratio of magnetite to the suspended solids was higher than 1.0.

• Resources Recycling
• /
• v.26 no.5
• /
• pp.97-104
• /
• 2017

Nuclear fuel cladding tubes are manufactured through pilgering and the annealing process. In order to remove the oxidized layer and impurities on the surface of the tube, a pickling process is required. Zirconium (Zr) is dissolved in a HF and $HNO_3$ acid mixture during the process and the pickling waste acid, including the dissolved Zr, is completely discarded after neutralization. This study observes the effects of the residual impurities (Ba) in the pickling solution regenerated from the $BaF_2$ precipitation process on the waste pickling solution. In addition, the concentration of Ba and Zr for the actual nuclear fuel cladding tube process was optimized. The regenerated pickling solution was tested through a pilot plant pickling process device that simulates the commercial pickling process of nuclear fuel cladding tubes, and the pickling efficiency was analyzed through AFM analysis of the roughness of the cladding tube surface.

• Journal of agriculture & life science
• /
• v.45 no.4
• /
• pp.65-72
• /
• 2011

The objective of this research is to develop biomass allometric equation for Pinus densiflora in central region and Quercus variabilis. To develop the biomass allometric equation by species and tree component, data for Pinus densiflora in central region is collected to 30 plots (70 trees) and for Quercus variabilis is collected to 15 plots (32 trees). This study is used two independent values; (1) one based on diameter beast height, (2) the other, diameter beast height and height. And the equation forms were divided into exponential, logarithmic, and quadratic functions. The validation of biomass allometric equations were fitness index, standard error of estimate, and bias. From these methods, the most appropriate equations in estimating total tree biomass for each species are as follows: $W=aD^b$, $W=aD^bH^c$; fitness index were 0.937, 0.943 for Pinus densiflora in central region stands, and $W=a+bD+cD^2$, $W=aD^bH^c$; fitness index were 0.865, 0.874 for Quercus variabilis stands. in addition, the best performance of biomass allometric equation for Pinus densiflora in central region is $W=aD^b$, and Quercus variabilis is $W=a+bD+cD^2$. The results of this study could be useful to overcome the disadvantage of existing the biomass allometric equation and calculate reliable carbon stocks for Pinus densiflora in central region and Quercus variabilis in Korea.

• FLOWER RESEARCH JOURNAL
• /
• v.17 no.4
• /
• pp.221-225
• /
• 2009

Interspecific crossing was conducted to obtain hybrid lilly with better quality of adapting to the unfavorable environment using oriental Lilium spp. as a female parent. Average interspecific crossing rate between oriental and asiatic lines by cut-style pollination was as low as 29%. Although the average germination rate of zygotic hybrid embryo between oriental 'Rodolfa' ${\times}$ asiatic 'Toronto' was increased from 76.6% to 78.3%. on 114 or 1/6 strength MS medium compared to the control, the rate of zygotic embryos formation between oriental 'Farolito' ${\times}$ asiatic 'Buff Pixie' was significantly enhanced up about 86~90% on 1/2 strength MS medium. Meanwhile, germination rate of interspecific hybrid embryo between oriental 'Snow Cristal' ${\times}$ asiatic 'Royal Trinity' showed up 100%. Germination rate of interspecific hybrids slightly increased by addition of $0.5-1.0mg{\cdot}L^{-1}$ GA. Germination rate of zygotic embryos between oriental 'Farolito' ${\times}$ asiatic 'Buff Pixie' and oriental 'Belcanto' ${\times}$ L. callosum was highest on the MS medium containing $0.01mg{\cdot}L^{-1}$ NAA and $0.1mg{\cdot}L^{-1}$ kinetin, as 66.6% and 45.2% respectively.

• Journal of The Geomorphological Association of Korea
• /
• v.19 no.1
• /
• pp.17-27
• /
• 2012

Coastal dunes help stabilize the coastal landscape and protect the hinterland through dynamic interaction with sand beaches. Sometimes dune erosion occurs during the tropical cyclones, while dune recovery may naturally follow after the event. As the typhoon Kompasu passed through the Korean Peninsula early-September in 2010, it caused a rise in water in association with the storm, wave run-ups, and heavy rains in coastal areas. As the result, coastal dunes along the west coast of Korea were severely damaged during the storm. However, the degree and extent of erosion and recovery of dunes were found to be related with the condition of beach-dune systems including gradients of foreshore and front slope of the dune, sediment supply, vegetation, wind activity, and human interferences. Some dunes retreated landward more and more after the erosional event, while others recovered its original profile by aeolian transport processes mainly during the winter season. Vegetated dunes with pine trees were less recovered after the erosion than grass-covered dunes. In addition, dunes with artificial defense were more eroded and less recovered than those without hard constructions. According to the observation after the severe storm, it is likely that the sand transport process is critical to the dune recovery. Therefore, the interactions between beach and dune must be properly evaluated from a geomorphological perspective for the effective management of coastal dunes, including natural recovery after the erosion by storm events.

• Korean Journal of Social Welfare Studies
• /
• v.48 no.1
• /
• pp.23-53
• /
• 2017

This study aims to examine how newly married couple's financial position influence the decision of divorce by using data from the Korea Labor and Income Panel Study (KLIPS). In particular, we closely examine the period between marriage and divorce for the households married since 2000. As a measure of household financial position, we focus on hosing debts because it can be considered as one of the most important factors for newly married couples. The key findings are as follows. First of all, age for marriage, age gaps between husband and wife and education level have a vital influence on the decision of divorce. In addition, in general, the household debts have decisive and negative effects on the future divorce decision. Especially, not only high absolute amount of debt but also high relative debt to household total income bring about a decision of divorce. The findings of this study suggest that systematic debt relief policies for newly married couples would be needed to build healthy family.

• Journal of the Korea Convergence Society
• /
• v.10 no.11
• /
• pp.131-141
• /
• 2019

This study is an empirical analysis of the characteristics of the organization and the performance of the company. The characteristics that make up the culture of a company's organization determine its success. Overcoming the company's closed cultural characteristics, entrepreneurial orientation, delegation, openness of organizational culture, and R&D capabilities have a positive impact on the company's performance. These characteristics of the company also play a positive role in embracing open innovation to generate innovative results. The characteristics of a company positively consider the acceptance and utilization of external resources. These variables proved that the nature of a company's organization is a factor in generating a company's performance. In this process, open innovation and the acceptance of external resources also proved to be a positive factor in generating corporate performance. The contents of this study provide an academic basis for the variables that build corporate organizational culture and provide a practical attitude to the role of leaders in managing corporate organizational culture. This study is focused on women's SMEs. n future research, the overall characteristics of the company will be considered. In addition, this study attempts to verify by applying various variables for generating performance of domestic SMEs by reflecting overcoming regional limitations.

• Journal of the Korean Society of Marine Environment & Safety
• /
• v.27 no.2
• /
• pp.247-255
• /
• 2021

The Ulsan anchorage has not secured a sufficient area than the anchorage demand, and the criteria for objective evaluation are not clearly defined. In this study, a general formula to solve the problems of the current anchorage density and occupancy concept was derived, and new adequacy evaluation criteria were proposed. The proposed criteria were applied to the Ulsan E anchorage to evaluate the suitability of the anchorage. The anchorage density and occupancy of the E1 anchorage were 129 % and 122 %, respectively, showing that both evaluation techniques exceeded 100 %, requiring anchorage expansion according to the evaluation criteria. A plan to expand the anchorage was reviewed considering the traffic pattern and the distance from the pilot boarding point. Therefore, a plan to open 35˚ on a sector at the end of the Ulsan No. 1 fairway was developed, and its suitability was verified. Base on the verification results, there was a part of the overlap between the extended area and the traffic track on the south of the E3 anchorage, but the possibility of affecting the marine traffic was minimal. In addition, it was confirmed that anchorage adequacy was achieved.

• Korean Journal of Food Science and Technology
• /
• v.53 no.6
• /
• pp.775-784
• /
• 2021

After isolating the DIMO 52 strain with a large inhibition zone diameter for Clostridium perfringens and maximum butyric acid production from the fecal sample of a breastfeeding infant, it was identified as Clostidium butyricum. The maximum growth of the DIMO 52 strain was reached 24 h after inoculation, and the maximum butyric acid concentration was approximately 34.73±4.27 mM. The DIMO 52 strain survived approximately 67.5% of the initial inoculum at pH 2.0, and approximately 64.9% survived in RCM broth supplemented with 0.3% (w/v) oxgall. In addition, DIMO 52 showed antibacterial activity against Escherichia coli KCTC 2441 and Salmonella Typhimurium KCTC 1925. In LPS-stimulated RAW264.7 cells, 1×10³ CFU/mL viable cells of the DIMO 52 strain also exhibited significant NO (nitric oxide) production inhibitory activity (33%, p<0.01). This result suggests that C. butyricum DIMO 52 has anti-inflammatory activity related to NO radical-scavenging activity. In conclusion, C. butyricum DIMO 52 isolated in this study has the potential to be used as a probiotic.