• Economic and Environmental Geology
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• v.45 no.1
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• pp.59-68
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• 2012

With the decline in discoveries of new oil fields and increasing demand from developing countries it is believed that enhanced oil recovery (EOR) technologies will play a key role to meet the energy demand in years to come. Based on the recently-published data, this paper discusses current status of global EOR market and technical development trends. The EOR market includes oil produced through various EOR recovery methods, such as thermal recovery, gas injection, chemical injection. Also, EOR methods are addressed screening criteria by reservoir and fluid characteristics including lithology, depth, thickness, and oil properties such as composition and gravity. Finally, the examples of field applied by various EOR methods are discussed with respect to reservoir characteristics and performance.

• Journal of Korean Society for Atmospheric Environment
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• v.5 no.1
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• pp.11-21
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• 1989

Atmospheric gaseous mercury was automatically measured by a mercury air monitor (Mercury monitor AM-1). The sample air was led to a scrubber and washed with buffer solution, and mercury was trapped with gold coated chromosorb P(AW) was successively eluted by heating the chromosorb and then detected by the cold vapor atomic absorption spectrophotometry. $SO_2, TSP, NO_x, CO, THC$. and some of meteorological factors were also measured simultaneously with mercury. A significant correlation between the concentration of mercury and those of 2,513 measurements, gaseous mercury concentration ranged from 4.73 to 112.8 $ng/m^3$ with an annual mean of 14.7$ng/m^3$ in urban area. At this place there was a clear seasonal variation with a maximuminDecember-January and aminimum in March-June. A secondary maximum existed in August to September. THe seasonal variation was found that the gaseous mercury in ambient air has a tendency to become low in spring and high in winter. Namely, the average of concentration in winter was about two times, 19.2 $ng/m^3$, higher than that in spring. In Seoul mercury levels on some months mainly Septermber-October increase with increasing relative humidity of the atmosphere. In Olympic park air levels were 8.2 (range 4.4-23.7)$ng/m^3$ with an coefficients of variation of 0.34 and in Seoul sports complex those were 7.7 (rnage 4.4-25.5) $ng/m^3$ with an coefficients of variation of 0.38 within the Seoul olympiad holding period of time. A significant diurnal mercury variation occurs both at the measuring sites and in the period of observation.

• Journal of Korean Society for Atmospheric Environment
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• v.12 no.5
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• pp.541-554
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• 1996

A set of 1994 data was analyzed to investigate the characteristics of background surface SO$_{2}$ concentrations at Kosan, Cheju Island, Korea. The SO$_{2}$ concentrations at Kosan site show a seasonal variation with a minimum(0.46 ppb) in summer, maximum(1.02 ppb) in spring and an annual mean of 0.83 ppb. These values were 4-7 times higher than those measured in other remote areas, such as Bermuda and Oki Island, but they were similar to the baseline concentrations of other sites in the world. The diurnal variation of SO$_{2}$ concentrations was very small and it shows a peak at 10 am in spring and fall, 2 pm in summer, and 1 pm in winter, respectively. Correlations between local meteorological parameters and SO$_{2}$ concentrations were mot significant. This suggests that the variations of the Kosan's SO$_{2}$ comcentrations were relatively independent on local meteorological variables. Backward trajectory analysis results showed that the seasonal variation of the OS$_{2}$ concentration was mainly due to the inflow of air masses from the continent in spring and from the Pacific Ocean im summer. The results also revealed that the air masses with the highest SO$_{2}$ concentration came through China or the Korea peninsula in spring and through Japan during summer. It was found that the SO$_{2}$ concentrations at Kosan were under the influence of passage of air masses arriving at this site.

• Environmental Engineering Research
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• v.17 no.3
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• pp.157-165
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• 2012

This experimental study was performed to obtain thermal energy from the combustion of synthetic gas, produced by the pyrolysis of insulating oil containing polychlorinated biphenyls (PCBs) in a high temperature and high pressure reactor. The average synthetic gas generated was $59.67Am^3/hr$ via the steady state gasification of insulating oil waste (20 kg/hr) with average concentrations (standard deviation) of $CO_2$, CO, and $H_2$ in the synthetic gas of $38.63{\pm}3.11%$, $35.18{\pm}1.93%$, and $28.42{\pm}1.68%$, respectively. The concentrations of the PCBs in the transformer insulating oil and synthetic gas after its gasification, and the concentrations of the dioxins that could be produced from the incomplete degradation of PCBs were measured. It was revealed that the PCBs in the insulating oil were composed of the series from tetrachlorobiphenyl to octachlorobiphenyl. However, only the #49, #44, #52, and #47/75/48 congeners were detected from the synthetic gas after gasification of the insulating oil and in the flue gas from the combustor. In conclusion, the experimental conditions suggested in this study were very useful for the appropriate treatment of insulating oil containing PCBs. Also, fuel gas containing CO and $H_2$ can be obtained from the pyrolysis of insulating oil containing PCBs.

• Journal of the Korean Society of Fisheries and Ocean Technology
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• v.53 no.1
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• pp.89-97
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• 2017

Butanol has an ability to improve the ignition quality due to its lower latent heat of vaporization; it has an advantage to reduce a volume of a fuel tank because its energy density is higher than that of ethanol. Also, butanol-diesel oil blending quality is good because butanol has an effect to prevent the phase-separation between two fuels. Even if the blended oil contains water, it can reduce the corrosion of the fuel line. Thus, it is possible to use butanol-diesel oil blended fuel in diesel engine without modification, and it may reduce the environment pollution due to NOx and particulate and the consumption of diesel oil. Therefore, some studies are being advanced whether butanol is adequate as an alternative fuel for diesel engines, and the results of the combustion and exhaust gas emission characteristics are being presented. Though the injection and spray characteristics of butanol are more important in diesel combustion, the has not yet dealt with the matter. In this study, the influence in which differences of physical properties between butanol and diesel oil may affect the injection and spray characteristics such as injection rate, penetration, spray cone angle, spray velocity and process of spray development were examined by using CRDI system, injection rate measuring device and spray visualization system. The results exhibited that the injection and macroscopic spray characteristics of two fuels were nearly the same.

• Ocean and Polar Research
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• v.26 no.4
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• pp.607-618
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• 2004

Zooplankton community was surveyed during the Seventh Korea Antarctic Research Program, from 28 December 1993 to 11 January 1994. Zooplankton samples were collected at 40 stations from the waters around the South Shetland Islands with a Bongo net and a MOCNESS. A total of 14 taxa of zooplankton were identified. Zooplankton abundances varied at each station as well as with the sampling gears. Zooplankton abundances were higher in the Western Weddell Sea than those in the Bransfield strait. Zooplankton collected with MOCNESS showed a different vertical distribution depending on its depths at selected stations. Copepods were the major components of zooplankton contributing 72.84% (mesh size $333{\mu}m$) and 68.36% (mesh size $505{\mu}m$) of total zooplankton abundance from the Bongo samples. Salps were the second most abundant group comprising 7.92% $(333{\mu}m)$ and 11.99% $(505{\mu}m)$ of total zooplankton abundance. Euphausiids, chaetognaths, polychaetes, pteropods and ostracods occurred more than 1% of total zooplankton. Copepods were not abundant at stations salps and euphausiids were dominant. Salpa thompsoni, Euphausia superba, Calanoides acutus, Metridia gerlachei and Calanus propinquus were dominant depending on the stations. The hierarchical UPGMA cluster analysis of dissimilarities between sampling stations is displayed with clusters identified similar habitats. Copepods rarely appeared in the clusters 4 and 5, and they appeared a ffw in the cluster 3 (or salps were numerous), while copepods were abundant in the clusters 1 and 2. As in the results of cluster analysis, the distributions of dominant taxa have a well identified correspondence to the geological positions included physical factors.

• Cartoon and Animation Studies
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• s.9
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• pp.161-183
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• 2005

In the main current 3D animations which are put on the screens, the characters in the animations have a directly effect on the audiences by being closely connected with their descriptive constructions. In this research i am going to recognize the importance of characters and trace the points of sameness in the characters that appear in the 3D animations by analysing them. For this, 1 divided the characters that made lots of box-office profits all over the world and were made at Pixar which focused on characters and stories into 7 types according to written by Vladimir Propp and grasped the characters with MBTI system. 1 found out the points of sameness between the characters with this system. That will be able to be made use of referring the streams of stories and fixing the characters at the planning and producing stages. If we should make a study of figures, expressions, motions of the characters in connection with this research, it could help us to create the characters which are suitable for animations not only formative elements but also acting.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.37 no.1
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• pp.17-27
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• 2009

Two-phase RoeM and AUSMPW+ schemes are preconditioned for the simulation of all Mach number flows, which are generally of interest for many gas-liquid two-phase application problems, because of large speed of sound in liquid region and low speed of sound in mixture or gas region. Conventional characteristic based schemes lose their accuracy or robustness in low Mach number flows, because their numerical dissipation terms are scaled by speed of sound, which is too large compared with local velocity magnitude in a low Mach region. All speed versions of RoeM and AUSMPW+ reflect the eigenvalues of the preconditioned governing system, which have the same order of magnitude even in low Mach number region. From the asymptotic analysis, it is observed that the discretized system by the developed schemes is consistent with the continuum system in the incompressible limit. The numerical results show the accurate and robust behavior of the proposed shcemes for all speed two-phase flows.

• Quality Improvement in Health Care
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• v.1 no.1
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• pp.32-43
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• 1994

The 'Pharmacy and Therapeutic Committee' decided to restrict the use of vancomycin which was categorized into restricted antimicrobials, among general, reserved and restricted antimicrobials. The committee also established prescribing guidelines of vancomycin in Seoul National University Hospital, May, 1991. Especially, the restricted antimicrobials should be used after approval by infectious disease specialist physician. A retrospective drug use evaluation (DUE) on vancomycin has been conducted to compare with the previous vancomycin DUE study in 1990. 'Criteria for DUE on vancomycin' was modified from Am J Hosp Pharm. Total 65 charts of patients were retrospectively reviewed from July 1991 to June 1992 in Seoul National University Children's Hospital. The justification of use was improved from 56% to 75% comparing with the previous study. In analyzing process indicators, several criteria including body temperature monitoring, WBC monitoring and use of concomitant antibiotics were well documented, but serum creatinine monitoring, culture and sensitivity test and level monitoring were infrequently performed, while the accepted level has been improved. Accepted level for appropriate initial dosage and duration of therapy were decreased. In outcome analysis, blood culture after discontinuing the drug was relatively well documented compared with the previous study. As the results, the approval vancomycin use was shown to be effective and rational in antibiotic therapy. And it is suggested that the above findings should be communicated to the medical staff, and a active intervention, such as feedback control, also be necessary for rational drug use.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.13 no.7
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• pp.3000-3006
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• 2012

We investigate whether the belief in good luck of stock traders influences their satisfaction with and their loyalty to a stock trading service. In particular, we tested whether the online stock traders who have irrational beliefs in good luck (e.g., I am a lucky person) (1) are satisfied with their online stock trading service more strongly and (2) stay with it longer than the online stock traders who have rational beliefs in good luck (e.g., luck does not exist). We have tested satisfaction, loyalty, and belief in good luck among 412 online stock traders and tested our two hypotheses. Our findings contribute to the academic research on service satisfaction and loyalty as well as provide implications to online stock trading service providers.