• Journal of Microbiology and Biotechnology
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• 제1권3호
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• pp.212-219
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• 1991

Four species of yeast, Saccharomyces cerevisiae, Candida utilis, Saccharomycopsis flbuligera, and Schwanniomyces castellii were evaluated for their ability to bioconvert potato processing waste water into microbial protein and the resulting single-cell proteins were evaluated as protein sources for rainbow trout, using in vitro analyses. The studies indicated that Schwanniomyces castellii, which utilizes starch dircetly and converts it into cell mass efficiently, was suitable for the bioconversion. In the single-stage continuous bioconversion, the yield S. castellii cell mass, which contained approximately 37% protein, was 77%, at dilution rate 0.25 $h^{-1}$. Reduction of total carbohydrate was 81%. During batch fermentations, cell mass yield was about 72% and total carbohydrate reduction was 81%. Among the yeasts tested, S. castellii possessed the most fragile cell wall and had a favorable amino acid profile for salmonid fish; protein score of 86% (Met). In an in vitro pepsin digestibility test 80% digestibility (23~38% above control) was observed when cells were pre-heated in a steam bath for 30 min. Results presented should be regarded as being preliminary in nature because they were derived from single experiments.

• 성인간호학회지
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• 제15권1호
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• pp.67-77
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• 2003

Purpose: This study was to examine the effects of music therapy on the levels of anxiety and discomfort in patients undergoing gastrofibroscopy. Method: This study was equivalent control group pre-post test design. The subjects were 61 patients who visited H hospital internal medicine department for gastrofibroscopy ; 31 were randomly selected for the control group and the remaining 30, for the experimental group. Result: 1. The experimental group who used music therapy showed a significantly lower level of anxiety during gastrofibroscopy than the control group. 2. The experimental group revealed a lesser change in pulse rate between pre and post gastrofibroscopy than the control group. 3. There was a significant difference in the levels of subjective and objective discomfort during gastrofibroscopy between the two groups. Conclusion: The results suggested that music therapy may help relieve anxiety and discomfort for patients undergoing gastrofibroscopy. These results showed that the use of music aided in the reduction of anxiety and discomfort during the unpleasant diagnostic procedure and, testing the effectiveness of music therapy deserves further study in other hospital settings.

• 한국물환경학회지
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• 제30권5호
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• pp.559-567
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• 2014

Since the ocean dumping of organic wastes is prohibited under the London Convention, the need for land treatment of food waste leachate (FWL) has significantly been growing in recent years. This study was conducted to use thermal solubilization to turn FWL into a form that can easily be degraded during the anaerobic digestion process, thereby reducing the percentage of solids and increasing the production of methane. To derive the optimal operating conditions of thermal solubilization, a laboratory-scale reactor was built and operated. The optimal reaction temperature and time turned out to be $190^{\circ}C$ and 90 min, respectively. The BMP test showed a methane production of 465 mL $CH_4/g$ $COD_{Cr}$ and a biodegradation rate of 90.1%. The production of methane rose by about 15%, compared with no the application of thermal solubilization. To reduce the solid content of FWL and improve the methane production, therefore, it may be helpful to apply thermal solubilization to pre-treatment facilities for anaerobic digestion.

• 한국자동차공학회논문집
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• 제7권8호
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• pp.34-42
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• 1999

In late 1997, the portion of registered light-duty diesel vehicle was 25.3% and its emission rate was 17.1% in Korea. Especially, diesel particulate matters(DPM) and NOx are hazardous air pollutants to human health and environment in urban area. The reduction technologies of exhaust emissions from diesel engines are improvement of engine combustion, fuel quality and development of diesel exhaust after treatment , In this study , a light-duty diesel oxidation catalyst(DOC) that is one of the diesel exhaust after treatment was made for performance evaluation and the emission characteristics were tested on CVS-75 mode. And the analysis of the particle size distribution with scanning mobility particle 100, 67.6% and 66.7, 10.0% for Pt and Pt-V catalyst .And for Pt catalyst, the PM increased 7.8% because of increasing sulfate but Pt-V catalyst reduced the PM to 23.0% . Test results of particle size distribution showed that peak values of number and mass densities are respectively 100∼200nm their distribution trend independent of vehicle speed.

• International Journal of Automotive Technology
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• 제8권2호
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• pp.179-184
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• 2007

In this study, the potential use of oxygenated fuels such as ethylene glycol mono-normal butyl ether (EGBE) was investigated in an attempt to reduce the emission of exhaust smoke from diesel engines. Effects of the combustion method on exhaust emission of DI and IDI diesel engines were also examined. Since EGBE is composed of approximately 27.1% oxygen, this is one of several potential oxygenated fuels that could reduce the smoke content of exhaust gas. EGBE blended fuels have been proven to reduce smoke emission remarkably compared to the conventional commercial fuels. The test was conducted with single and four cylinder, four stroke, DI and IDI diesel engines. The study showed that a simultaneous reduction of smoke and NOx emission could be achieved by the combination of oxygenated blend fuels and the cooled EGR method in both DI and IDI diesel engines. It was also found that a reduction rate of exhaust emission in a DI engine was larger than an IDI diesel engine.

• 동력기계공학회지
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• 제21권4호
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• pp.84-93
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• 2017

This study was carried out to improve the electric power consumption of HVAC in the blow mold machine(BMM) and work environment. The experiment was conducted with the simulated HVAC system of 1/15 of the actual BMM. The temperature of main facility and two preheaters was fixed at 200 and $60^{\circ}C$ respectively in all test conditions. The measured points of temperature were chosen as critical locations considering the work environment. The tendency of temperature distributions decreases as the duct was closed to the main facility. The reduction rate of power consumption of HVAC increases up to 32.3% when both duct and cooling systems are operated. Also the efficiency of HVAC is improved about 9% through the modified design of duct system. It notes that the electric power consumption of HVAC can be reduced by the optimum design and operating condition of duct and cooling system.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2004년도 추계학술대회논문집
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• pp.461-464
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• 2004

The reduction effect of floor impact noise depends on the various factors such as stiffness and thickness of the concrete slab, finishing If ceiling materials and the composition method. Among the rest it is well known that floating floor system is more effective. Standard floating floor(SFF) type-2 consisted of 50mm lightweight aerated concrete(LAC) and 20mm damping material has been widely used. But LAC construction problem on dry damping material occurred and the reduction effect of floor impact noise has bare minimum qualifications. Thus the aim of this study is to develop 40mm composite damping material(Soundzero Plus) for SFF type-5 which substitute LAC and damping material. 'Soundzero Plus' is satisfied with quality requirement for damping material for SFF. The heat transition rate, $0.45W/m^2{\cdot}K$ is more effective 55% about than the regulation. The test results of floor impact noise by using 'Soundzero Plus' are showed good improvement about 12dB (tested by tapping machine) and 4dB (tested by bang machine) between before and after.

• Nuclear Engineering and Technology
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• 제56권4호
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• pp.1398-1406
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• 2024

The control rod worth is a key safety parameter required to be measured in commercial pressurized water reactors (PWRs). Conventionally, the control rod worth is measured after reaching the critical state, which occupies the considerable time in the zero-power physics test. In this study, an efficient control-rod worth measurement technique has been proposed based on the improved neutron-source multiplication method, which can be implemented with the source-range detector count rates in the subcritical states. Moreover, the noise reduction technique has been adopted to smooth the large fluctuation existing in the original signals. In order to verify the engineering performance of the proposed measurement technique, the measured source-range detector count rates during the rod withdrawal process before reaching critical state in a CNP1000 reactor have been employed. It demonstrated that almost all estimated results of control rod worth satisfy the engineering acceptance criteria, except one control rod with the relative difference over 10 %, which indicates the capability of the proposed method in estimating control rod worth.

• 한국식품과학회지
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• 제40권1호
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• pp.1-7
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• 2008

11, 12, 1월에 수확한 대파를 5, 10, $20^{\circ}C$의 저장 온도에 넣어 저장(0, 3, 7, 11, 15일) 중의 품질변화를 관찰하였다. 11월 수확한 대파를 $5^{\circ}C$에서 저장했을 때의 호흡률은 10.05 $mL/hr{\cdot}kg$으로 12월과 1월 수확한 대파에 비하여 호흡률이 유의적으로 낮았으며, 저장온도를 $5^{\circ}C$로 하는 것이 $10^{\circ}C$나 $20^{\circ}C$에 저장하는 것에 비하여 호흡률이 낮게 나타나 대파의 대사속도를 낮춰 신선도를 유지하는 것에 효과적임을 알 수 있었다. 수확기간별 대파의 저장 중 중량감소율의 변화는 11월에 수확하여 $5^{\circ}C$에 저장한 대파의 중량감소율이 9.35%로 가장 낮게 측정되었으며 이는 다른 실험구보다 최소 2.15%, 최대 9.92% 낮은 중량감소율을 보여 가장 효과적인 것으로 나타났다. 대파의 변패율은 1월에 수확한 대파가 가장 높게 나타났으며, 저장 15일이 지난 후에도 11월 수확한 대파가 초기에 비하여 황화정도가 가장 적었다. 또한 대파 엽부의 경도 변화를 측정한 결과 11월, 12월 및 1월에 수확하여 $5^{\circ}C$에 저장하였던 실험구가 다른 온도처리군보다 월등하게 경도가 유지되었던 반면 수확시기에 따른 경도는 큰 차이를 보이지 않았다. 수확기간별 대파의 저장온도에 따른 위조현상, 색변화, 풍미, 구매의사의 항목에 대하여 관능평가를 한 결과는 저장 기간 동안 각각의 관능 항목에서 11월에 수확하여 5oC에 저장한 대파가 가장 높은 점수를 받았다(p < 0.05). 이러한 관능평가의 결과는 대파의 호흡률, 중량감소율, 변패율, 색, 경도와 동일한 경향을 보였다.

• 한국응급구조학회지
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• 제25권2호
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• pp.19-38
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• 2021

Purpose: This study aimed to investigate the relationship between emergency medical service accessibility in different regions and the sudden death rate in elderly patients with ischemic heart disease using data analysis techniques and suggest improvements in regional emergency medical services. Methods: The study collected data from the NEDIS database and Statistics Korea. Data on a total of 75,867 patients aged ≥65 years were reviewed among patients with ischemic heart disease who visited emergency medical institutions in 2018. Frequency analysis, chi-square test, multiple logistic regression analysis, and simple logistic regression analysis were performed using SPSS PC Window 25.0. Results: With an emergency medical resource per 100km², there was a concomitant reduction in the risk of death. There was a decrease in the death rate by 0.967, 0.970, 0.997, and 0.391 times with the increase in the presence of a fire department, an ambulance, a paramedic, and a regional medical center, respectively. Furthermore, a decrement in the death rate was witnessed 0.844, 0.825, and 0.975 times with the initiation of a local emergency medical center, a local emergency medical institution, and an angiography device, respectively(p <.001). Conclusion: To improve the accessibility of emergency medical services, the population and geometric area of the region should be considered essential factors when deploying emergency medical resources.