• 한국건축시공학회지
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• 제12권2호
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• pp.194-202
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• 2012

This paper predicts the cementing efficiency of fly-ash(FA) based on mortar test considering binder-water ratio and FA replacement ratio as experimental variables. The cementing efficiency prediction model proposed by statistical analysis enables us to estimate the value according to the binder-water ratio and FA replacement ratio of matrix. When FA replacement ratio is the same, the lower the binder-water ratio, the higher the estimated cementing efficiency. There are significant differences in the values according to binder-water ratio at FA replacement ratios of 15% or less, but there are almost no differences when FA replacement ratio is more than 15%. As the binder-water ratio increases, the variations in the values according to FA replacement ratio are great at FA replacement ratios of 15% or less. As the FA replacement ratios increase, the values increase for FA replacement ratios of 15% or less, but decrease for more than 15%. The values range from -0.71 to 1.24 at binder-water ratio of 1.67-2.86 and FA replacement ratio of 0-70%. The RMSE of the 28-day compressive strength predicted by modified water-cement ratio is 2.2 MPa. The values can be trusted, as there is good agreement between predicted strength and experimental strength.

• 수산해양기술연구
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• 제23권1호
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• pp.30-38
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• 1987

좁은 틈새를 가진 원판밸브의 추력에 대한 이론적 해석 및 실험 결과로부터 다음과 같이 요약할 수 있다. 1. 원판 밸브의 틈새가 비교적 작은 경우(H/D sub(1)가 0.1 이하) 즉, 유량이 적을 때에는 점성류가 지배적이고 이론식으로부터 추력을 높게 예측할 수 있었다. 2. 압력의 영향에 대한 추력은 입구 압력이 낮을수록 이론결과와 실험결과가 잘 일치하고 높을수록 관성의 영향이 크게 나타나는 경향을 보였다. 3. 밸브 크기 변화에 대한 추력의 영향은 D sub(2)/D sub(1)=>4.6에서는 포물선적으로 감소하고 그 이하에서는 직선적으로 감소하였다.

• Journal of Preventive Medicine and Public Health
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• 제14권1호
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• pp.23-31
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• 1981

This study was conducted to investigate the effects of passive inhalation of cigarette smoke and the correlation between change of flicker value and active or passive smoking in poorly ventilated room. Forty five male students were tested by divided into four experimental groups composed of active and passive smokers and three control groups. Each four experimental groups were exposed to smoke for Two hours in enclosed room. Vital capacities, flicker values, blood carboxyhemoglobin levels and carbon monoxide concentration in room air were estimated before, during and after the exposure, and amounts of smoking or smoke exposure during two hours were also noted. The results obtained were as follows; 1. Concentration of carbon monoxide in air and increase of blood carboxyhemoglobin level (% COHb) were positively correlated with smoking amount. 2. Increase of blood carboxyhemoglobin in passive smokeres, in average, were about seventy six percent of that in smokers, as 2.2% vs. 2.9%. 3. Comparison with published data showed that Peterson's equation gave most similar result to this study in estimation of increase of blood carboxyhemoglobin level. 4. During the exposure, flicker values fell steadily in both experimental groups and control groups as time passed. Flicker values were, however, elevated again in experimental groups after exposure, despite the fact that values still fell in control groups. 5. Blood carboxyhemoglobin and flicker value were negatively correlated and this correlationship was stronger in passive smoker than in active smoker. 6. Multiple regression equation between flicker value and exposure time and blood carboxyhemoglobin level was expressed as: Flicker value=41.6-0.2 COHb%-0.9Hour, 7. In general, it is suggested that biological criteria would be more preferrable than chemical criteria in establishment of statutory limitation of smoking in enclosed spaces.

• 성인간호학회지
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• 제18권3호
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• pp.367-376
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• 2006

Purpose: This study was designed to explore the effects of providing individualized education for hemodialysis patients on their knowledge of hemodialysis, compliance of patient role behavior, and physiologic parameters. Method: A quasi experimental design with a non-equivalent control group and a non-synchronized design was used. The experiment was conducted with a total of 40 hemodialysis patients (20 in the experimental group and 20 in the control group) at the artificial kidney center, C University Hospital. The experimental group was provided with individualized education, 30 minutes per session, three times per week, for two weeks. Results: The experimental group had significantly higher knowledge of hemodialysis than the control group after the education. The compliance of patient role behavior was more enhanced in the experimental group than the control group. The experimental group showed significantly higher values of blood urea nitrogen, but not the values of blood creatinine, albumin, kalium, and phosphorus. Conclusion: The individualized education was found to be an effective intervention for improving patients' knowledge of hemodialysis and compliance of patient role behavior.

• 대한한의학회지
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• 제16권1호통권29호
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• pp.271-280
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• 1995

Effects of aqua-acupuncture with soshiho-tang at Kansu(BL_{18}$) and Tamsu(BL_{19}$) on the Glutamic Oxaloacetic Transaminase(GOT), Glutamic Pyruvic Transaminase(GPT), Lactic dehydrogenase(LDH) and blood pictures in rat with $CCI_4$ were determined. In the group with $CCI_4$ the activity of GOT, GPT and LDH showed a tendency to increase, however these values showed a tendency to decrease by the aqua-acupuncture with soshiho-tang throughout experimental days and these values were recovered to those of control group on the last experimental days. Counts of RBC and Hemoglobin showed a tendency to decrease in rat with $CCI_4$, however these decreased values were recovered by the aqua-acupuncture with soshiho-tang and on the last experimental days, these values were similar to those of control group. In the $CCI_4$ group, counts of WBC and the proportion of Lymphocytes showed a tendency to increase and the proportion of Neutrophils showed a tendency to decrease, however these values showed a rapid recovery by the aqua-acupuncture with soshiho-tang. In the meridian point of Kansu and Tamsu, the effects of aqua-acupuncture with soshiho-tang on recovery of liver function showed no difference. Results from this study indicate that the aqua-acupuncture with soshiho-tang can improve the liver function in rat with $CCI_4$.

• Nuclear Engineering and Technology
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• 제22권2호
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• pp.108-115
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• 1990

0.5~l.2-MeV 양성자빔에 대한 X-선 발생단면적의 측정을 Cu와 Au에 대해 수행하였다. 이 실험에서는 SNU 1.5-MV 탄뎀 반데그라프 가속기에서 얻은 양성자빔을 표적에 입사시켰다. 여기서 방출된 X-선과 후방산란된 양성자는 Si(Li) X-선 검출기와 SSB(Silicone Surface Barrier) 하전입자 검출기를 이용해 동시 측정하였다. 그리하여 측정된 X-선 발생단면적은 다른 실험치들 및 PWBA(Plane Wave Born Approximation)와 ECPSSR(Perturbed Stationary State corrected Energy loss, Coulomb deflection, Relativistic effects)인 이론치들과 비교하였다. 1.0-MeV근처의 양성자에너지에 대해 측정치는 PWBA 값보다는 ECPSSR(D.D. Cohen et al., 1985) 값에 더 잘 일치함을 보였다. 특히, Au의 측정치는 1.2-MeV 양성자빔에 대해 9.69$\pm$0.39 bams이었고, ECPSSR 이론치와는 5% 이내로 일치했으며, 0.5~l.2-MeV 양성자에 대한 실험치는 대부분의 다른 실험치들과 30% 이내로 일치했다.

• 한국토양환경학회지
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• 제3권3호
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• pp.11-20
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• 1998

Soil venting이 오염토양중 가솔린의 용출거동에 미치는 영향을 평가하기 위하여 Raoult의 법칙에 근거한 복합물질 휘발/용해거동 모델을 적용하였다. 먼저 순수 가솔린의 용해거동과 휘발거동에 대해 검토한 후 토양중 가솔린의 거동에 적용하여 보았다. 가솔린성분들의 용해거동은 휘발에 의한 성분조성의 변화와 상관없이 Raoult의 법칙에 의해 비교적 정확하게 예측할 수 있었으며 오차범위는 naphthalene을 제외하고는 최고 $\pm$100% 이내였다. 오염토양의 형태로 가솔린이 존재하는 경우에도 Raoult의 법칙에 의해 정확히 예측될수 있었으나 토양중 농도가 초기 20,000 mg/kg에서 1,360 mg/kg까지 감소한 경우에는 예측치가 계산값보다 50~100% 정도 높은 경향을 보였다. 한편 soil venting시 휘발에 따른 조성변화를 Raoult의 법칙을 이용하여 산정하고 각 성분조성에 대한 개별물질들의 용출잠재성을 결정하는 모델을 이용하여 실험결과와 비교하였으며 모델값과 실험값의 차이에 대한 몇가지 가능한 시나리오를 제시하였다.

• 대한수의학회지
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• 제34권2호
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• pp.407-415
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• 1994

Present experiments were undertaken in order to find out the most available diagnostic method for acute pancreatitis. Experimental dogs were divided into experimental group and control group. The experimental dogs were laparotomized and their pancreatic ducts were ligated for the induction of pancreatitis. The control dogs were laparotomized only for comparison. In addition to the complete blood count, serum amylase and lipase activities, serum glucose, total protein and albumin contents were measured daily for 11 days after the operation. Fecal fat droplet count by Sudan III staining and fecal trypsin activity examination by x-ray film digetion test were also undertaken daily. The results obtained were summarized as follows; 1. Serum amylase activities of the experimental group increased to peak on the third day and returned to the preoperative values on the eighth day. 2. Serum lipase activities of the experimental group increased to peak on the first day and returned to the preopertive values within six to eight days. 3. Serum glucose contents of the experimental group showed significant increse only on the first day. 4. Serum albumin contents of the experimental group decreased significantly during the experimental period. Whereas those of the control group significantly decreased only on the first day. 5. The experimental group showed marked leukocytosis, neutrophilia, and lymphopenia for the first 5 or 8 days. Whereas the control group showed only neutrophilia for the first 3 days. 6. The results of fecal fat droplet count showed some diagnostic value on the third and fourth day in only one experimental dog(No 1). No significant changes in the fecal trypsin activity were noticed in all dogs. 7. Histopathologically. all dogs of experimental group showed changes of pancreatitis. However the degree of the pancreatic lesion was not pararell to the degree of the serum amylase or lipase activity changes.

• 한국조명전기설비학회:학술대회논문집
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• 한국조명전기설비학회 2005년도 춘계학술대회논문집
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• pp.342-345
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• 2005

This paper describes the electron energy distribution function characteristics in $SF_6-He$ gas calculated for range of E/N values from $50{\sim}700[Td]$ by the Monte Carlo simulation(MCS) and Boltzmann equation(BE) method using a set of electron collision cross sections determined by the authors and the values of electron swarm parameters are obtained by time of flight(TOF) method. The results gained that the values of the electron swarm parameters such as the electron drift velocity, the electron ionization or attachment coefficients, longitudinal and transverse diffusion coefficients agree with the experimental and theoretical for a range of E/N. The results of Boltzmann equation and Monte carlo simulation have been compared with experimental data by Pollock, Ohmori, cottrell and Walker.

• 유공압시스템학회논문집
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• 제7권1호
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• pp.6-10
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• 2010

A measurement of very high torque for track drive unit in construction equipment is usually in difficulties due to the requirement of a torque meter with high capacity, and the limitation of geometry for an experimental set-up. To improve the troublesome problem, a new device was proposed, where a torque transmitted through the torque arm can be measured by load cells attached at each torque arm. The experimental set-up of the new device was carried out in order to measure the torque values for a mechanical feedback type planetary gear box, in which the power flow circulates itself in a closed-loop. The new device enables to measure torque values of 60,000Nm. Additionally, the measured values were estimated statistically in the aspect of their repeatability and reproducibility, so that an acceptable behaviour as a measuring device can be confirmed.