• Journal of Korean Clinical Nursing Research
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• v.20 no.1
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• pp.28-39
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• 2014

Purpose: The purpose of this study was to investigate the effect of preoperative education about patient controlled analgesia (PCA) on postoperative pain control for elderly after total knee arthroplasty. Methods: The study applied a quasi-experimental design. To prevent communication between experimental group and control groups, data from control group were collected before provision of preoperative education for the experimental group. A total of 50 elderly patients who underwent total knee arthroplasty and older than 65 years old participated in this study. The preoperative education about PCA was provided for the experimental group before surgery. The preoperative education program consisted of fifteen minute education about pain control, and PCA use, as well as demonstration of PCA use. Results: The experimental group had higher knowledge score about pain and PCA use, and more positive attitudes toward pain and use of analgesics after surgery than the control group. There was no significant difference in use of additional analgesics after surgery between the two groups. The experimental group had significantly lower pain score at 8, 24 and 36 hours after surgery than the control group. The experimental group had higher level of satisfaction about PCA use than the control group. Conclusion: The preoperative education about PCA, customized for elderly patients could be an effective nursing intervention for postoperative pain control after total knee arthroplasty.

• Journal of Korean Clinical Nursing Research
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• v.17 no.3
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• pp.455-466
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• 2011

Purpose: The purpose of this study was to investigate the effects of a structured preoperative PCA education on the knowledge and attitude regarding PCA usage, level of pain, and the consumption of analgesics after operation for colorectal surgery patients. Methods: This study was conducted from 18 Feb to 2 May, 2008. Participants were 80 colorectal cancer patients who would use the IV-PCA after colorectal surgery in a cancer hospital in Gyeonggi-do, Korea. Two groups, experimental and control were consisted of 40 patients each. The 20-minute structured education regarding PCA usage was applied to each patient individually in the experimental group but only the routine anesthetic consultation was given to each patient in the control group the day before the surgery. The SPSS/PC 10.0 program was introduced to analyze the collected data on frequency, percentage, mean, standard deviation, $x^2$-test, t-test and paired t-test. Results: The experimental group with the structured preoperative PCA education showed higher knowledge and more positive attitudes regarding the PCA usage than the control group. Also the experimental group showed better pain control and lower consumption of analgesics at 4, 8 and 24 hours after than the control group. Conclusion: The structured preoperative PCA education is an effective nursing intervention for improving the knowledge and attitude of the colorectal surgery patients on the PCA usage, and enabling the patient to take the analgesic more effectively with lower consumption, while reducing the patients' pain after operation.

• The Journal of Engineering Geology
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• v.24 no.2
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• pp.217-225
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• 2014

Water curtain cultivation (WCC) systems in Korea have depleted water resources in shallow aquifers through massive pumping of groundwater. The goal of this study is to simulate the groundwater variations observed from massive groundwater pumping at a site in Cheongweon. MODFLOW was used to simulate three-dimensional regional groundwater flow, and the SWAT (Soil and Water Assessment Tool) watershed hydrologic model was employed to introduce temporal changes in groundwater recharge into the MODFLOW model input. Additionally, the estimation method for groundwater discharge in WCC areas (Moon et al., 2012) was incorporated into a groundwater pumping schedule as a MODFLOW input. We compared simulated data and field measurements to determine the degree to which winter season groundwater drawdown is effectively modeled. A simulation time of 107 days was selected to match the observed groundwater drawdown from November, 2012 to March, 2013. We obtained good agreement between the simulated drawdown and observed groundwater levels. Thus, the estimation method using daily minimum temperatures, may be applicable to other cultivation areas and can serve as a guideline in simulating the regional flow of riverside groundwater aquifers.

• Asian Journal of Turfgrass Science
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• v.24 no.2
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• pp.156-160
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• 2010

This study was performed to provide useful information for kentucky bluegrass management during summer by application of plant growth regulator, Trinexapac-ethyl. Visual quality, shoot density and chlorophyll contents of treatment blocks were significantly different from those of control during summer by application of Trinexapac-ethyl. The turfgrass density of treatment was increased of 4ea/$10\;cm^2$, especially about 5ea/$10\;cm^2$ during the growth retarded period of June and July. Chlorophyll contents index and visual quality of kentucky bluegrass were improved by application of Trinexapac-ethyl during summer, too. In addition, the occurrence of foliage in rainy and high temperature season was less than that of control. However, there was no significant difference in the root length of Kentucky Bluegrass. Meanwhiles, mowing height of kentucky Bluegrass was suppressed by 38% at 2 WAT week after treatment and that there was no significant growth of treatment at 4 WAT. In this experiment, turfgrass quality was significantly better than that of control during July, even though trinexapac-ethyl wasn't applied at all in July. Consequently, periodic treatment of trinexapac- ethyl from spring would be very important to promote the turfgrass visual quality during summer which is unfavorable season on the growth of kentucky bluegrass. And it is possible to reduce mowing times at least 30% for 2 weeks by one application of Trinexapac-ethyl 0.02~0.03 ml/$m^2$ in kentucky bluegrass fairway. Additively, trinexapac- ethyl treatment can be helpful environmentally by cutting down the fertilizers and pesticides in golf course.

• Journal of Bio-Environment Control
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• v.30 no.4
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• pp.328-334
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• 2021

This study was conducted to analyze the effect of fog cooling during daytime and heatpump cooling at night in greenhouses in summer. During daytime, the average temp. and RH of the control greenhouse which had shading screen were 32.1℃ and 59.4%. and the average temp. and RH of the test greenhouse which had fog cooling were 30.0℃ and 74.3%. At this time, the average outside temp. and RH were 31.4℃ and 57.7%. So, the temp. of the control was 0.7℃ higher than outside temp., but the temp. of the test was 1.4℃ lower than outside and 2.1℃ lower than control. The average RH was 74.3% in the test and 59.4% in control. The average temp. and RH of the control greenhouse which had natural ventilation at night were 25.2℃ and 85.1%, and the average temp. and RH of the test greenhouse which had heat pump cooling were 23.4℃, 82.4%. The average outside temp. and RH at night were 24.4℃ and 88.2%. The temp. of the control was 0.8℃ higher than outside temp., but the temp. of the test was 1.0℃ lower than outside and 1.8℃ lower than control. The average RH was 82.4% in test and 85.1% in control greenhouse. There was no significant difference between the plants growth eight weeks after planting. But after the cooling treatment, the values of stem diameter, plant height, chlorophyll in test were higher than control. The total yield was 81.3kg in test, 73.8kg in control, so yield of test was 10.2% higher than control. As a result of economic analysis, 142,166 won in profits occurred in control greenhouse, but 28,727 won in losses occurred in test greenhouse, indicating that cooling treatment was less economical.

• The Magazine of the Society of Air-Conditioning and Refrigerating Engineers of Korea
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• v.33 no.3
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• pp.24-28
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• 2004

흡수식 2중 효용 냉온수기의 개발 현황을 소개하고자 하며, 흡수식 관련 연구개발이 보다 활성화되는 방향을 제시하고자 한다. 하절기 및 동절기의 중대형 빌딩의 냉난방 부하 대응에 흡수식 냉온수기가 차지하고 있는 비율이 높음으로 흡수식 냉온수기의 고효율화가 경제 및 산업적으로 건물 에너지 절감 및 국가 전체 가스 에너지 절약에 미치는 파급 효과는 매우 크다. 흡수식냉동기는 근본적으로 오존파괴의 문제가 없는 냉매를 사용하고 있고, 고급연료인 LNG를 주로 사용하고 있기 때문에, 지구온난화 유발물질인 $CO_2$ 배출량이 다른 연료에 비해 작다. 아울러 극소량의 공해물질(Nox, Sox)을 방출하며 공해문제를 별로 발생시키지 않기 때문에 흡수식냉동기의 연구개발을 거의 하지 않은 서방 선진국에서도 환경친화적인 흡수식 제품에 대한 관심이 최근에 급증하고 있다.(중략)

• Journal of Korean Institute of Fire Investigation
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• v.5 no.1
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• pp.21-24
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• 2004

본 연구는 가스시설에서 가장 중요한 기능을 하는 압력조정기가 가스공급압력을 연소기에 적합하게 조정압력을 높이거나 낮추어 일정하게 공급하여 연소가 정상적으로 이루어지도록 기능을 하고 있다. 압력조정기는 가장 보편화되어 있는 가정용 압력조정기인 l단감압식저압조정기를 비롯하여 자동절체식일체형저압조정기 등 여러 가지 형태가 사용되어지고 있다 LP가스압력조정기와 관련된 사고는 입구측니플 풀림, 내부부식, 밸브시트손상, 다이아프램손상 등 다양한 결함에 의해서 발생하고 있다. 압력조정기의 사고는 10년도안 전체사고의 5%를 차지하며, 주로 하절기인 6월부터 9월까지 사고가 많아 발생하였다 따라서 일반가정에서 가장 많아 사용하고 있는 1단감압식저압조정기를 대상으로 연구하였다.

• Bulletin of the Korean Space Science Society
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• 2010.04a
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• pp.33.1-33.1
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• 2010

천상열차분야지도에는 유방택이 계산하여 작성한 중성기가 실려 있다. 중성기란 24절기일 각각에 대해 혼각과 효각에 자오선이위치하는 하늘의 입수도를 표로 만들어 놓은 것이다. 우리는 유방택이 사용할 수 있었던 역법이 선명력과 수시력이라고 생각하고, 우선 수시력에 의한 중성 계산법으로 을해중성기를 계산해 보았다. 이때 적도수도 값에 따라 중성기가 달라질 수 있는데, 유방택이 사용가능한 28수의 적도수도는 천상열차분야지도에 수록되어 있는 것, 수시력에서 사용한 것, 선명력에서 사용한 것이 있었을 것이다. 우리는 여기에 몇 가지 다른 적도수도들의 경우를 더하여 유방택이 어떤 계산 방법으로 중성기를 작성했는지 알아보았다. 그 결과, 베이징 기준의 수시력과 선명력의 적도수도의 조합이 을해중성기와 가장 가까운 결과를 주었으며, 천상열차분야지도의 적도수도와 수시력의 적도수도도 비교적 을해중성기에 가까운 결과를 주었다. 우리는 유방택이 선명력의 중성 계산 방법과 선명력의 적도수도를 사용하여 을해중성기를 작성한 것이 아닌가 추측하고 추후 연구를 계속하려고 한다.

• Proceedings of the Korean Institute of Building Construction Conference
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• 2020.06a
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• pp.98-99
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• 2020

The objective of the study is to investigate the compressive strength of damaged part by early frost damage and sound part of the concrete placed when exposed to a low temperature of -20℃ for 24 hours in normal concrete. Test results indicated that the compressive strength of damaged part was 14.5 MPa lower than that of sounf part due to early frost damage.

• Korean Journal of Air-Conditioning and Refrigeration Engineering
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• v.24 no.8
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• pp.599-604
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• 2012

Most air pollution and smog are a result of the burning of fossil fuels. The use of fossil fuels also causes acid rain and global warming. So the need for solar energy utilization is increased. It is essentially important to make efforts to reduce usage of fossil energy resources. In this study, we analyzed the correlation between climatic elements(Cloud cover, Duration of sunshine, Temperature) and the photovoltaic power generation. Cloud cover of the correlation coefficient was 0.87. And duration of sunshine of the correlation coefficient was 0.93. The order of the correlation coefficient was duration of sunshine, cloud cover, temperature. To accurately analyze of the degree of correlation for the photovoltaic power generation, additional research about climatic elements that show a high correlation is needed.