• Environmental Engineering Research
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• v.21 no.4
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• pp.427-435
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• 2016

In this study, change in water-dissolved oxygen (DO) was analyzed under various synthetic water qualities and nanobubbles (NBs) application conditions, such as gas type, initial DO as well as water dissolved, suspended and organic matters contents. When oxygen, rather than air, was introduced into nitrogen-desorbed ultra-pure water, the stagnation time was significantly increased. It took ten days for DO concentration to drop back to saturation. The higher the initial DO concentration, the longer particles were observed above saturation due to particle stability improvement. The oxygen mass transfer rate of 0.0482 mg/L/min was found to reach a maximum at an electrolytic concentration of 0.75 g/L, beyond which the transfer rate decreased due to adsorption of negative ions of the electrolyte at the interface. High levels of turbidity caused by suspended solids have become a barrier to dissolution of NBs oxygen into the water solution, and thus affected the transfer performance. On the other hand, by applying NBs for just an hour, up to 7.2% degradation of glucose as representative organic matter was achieved. Thus, NBs technology would maintain a high DO extent for an extended duration, and thus can improve water quality provided that water chemistry is closely monitored during its application.

• Journal of the korean academy of Pediatric Dentistry
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• v.25 no.4
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• pp.772-781
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• 1998

The purpose of this study was to assess the sedative effect of intranasal spray with midazolam for management of the uncooperative 20 children aged from 24 months to 92 months who required extensive treatment. The patients were given randomly a dose of 0.2mg/kg of intranasal placebo, intranasal spray with midazolam, and intranasal drop with midazolam. All the children were restrained in a pediwrap and were monitored with pulse oximeter for assessing the pulse rate and peripheral oxygen saturation. According to Fukuta's behavior rating scale, behavior was checked for evaluation of the clinical sedative effect. The obtained results were as follows: 1. Behavior score of intranasal spray with midazolam was lower than intranasal drop with midazolam(P<0.01). 2. Pulse rate was a significant change as a function of dental procedure(P<0.001), however the peripheral oxygen saturation was not influenced significantly by either adiministration route of drug or dental procedure. Clinically, intranasal spray with midazolam were safe and effective sedation in young children undergoing pediatric dental procedures.

• Child Health Nursing Research
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• v.24 no.1
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• pp.1-8
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• 2018

Purpose: This study compared the pain and skin reactions of neonates according to the method of removing the adhesive eyepatch used for phototherapy. Methods: The subjects included 20 neonates admitted at C University Hospital. In group 1 (n=10), DuoDERM dressing was attached under the adhesive eyepatch, which was removed with water, while in group 2 (n=10), the eyepatch was attached on the skin and removed with oil. Heart rate, oxygen saturation, the Neonatal Infant Pain Scale (NIPS), crying time were measured. Data were analyzed using repeated-measures analysis of variance. Results: No interaction was found between group and timing for heart rate and oxygen saturation. In group 1, the NIPS score was higher and the crying time was longer than in group 2. No difference was observed in the erythema score between the groups. Conclusion: Removing the adhesive eyepatch using oil can be used as a nursing intervention to reduce pain and improve comfort in neonates.

• Child Health Nursing Research
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• v.4 no.2
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• pp.245-254
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• 1998

Prematurity is the main cause for respiratory disorders in neonates. The goal in respiratory management is to maintain respiration with adequate oxygenation. Chest vibration(CV) prior to on dotracheal suctioning(ETS) has been arbitrarily applied to ventilated premature infants without the scientific evaluation of its safety and efficacy. A repeated measure within subjects experimental study was conducted to investigate the effects of CV prior to 875 on oxygenation and lung secretions in twenty-one ventilated premature infants. The independent variable was the type of research protocol, the control type (275 without C.V) and t he intervention(ETS with CV). The dependent variables were oxygen saturation(SpO₂), heart rate (HR), measured by pulse oximeter, and the amount of lung secretions measured in gram. The results showed there was no difference in SpO₂ responses regardless CV employed before ETS. But there was a significant difference in HR responses between the control and the intervention, even without clinical significance. There was a significant difference in the amount of lung secretions retrieved during ETS with CV, compared to ETS without CV. This study suggested the safety of CV by demonstrating no clinically significant changes in SpO₂ and HR in premature infants. The efficacy of CV could be supported by the increases in the amount of sputum during ETS with CV compared to ETS without CV in premature infants.

• Journal of Korean Critical Care Nursing
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• v.3 no.1
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• pp.41-51
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• 2010

Purpose: The purpose of this study was to identify the effects of family visits upon the stress response of patients and their families, Methods: This study was the interrupted time series design, The subjects consisted of 197 patients and 197 family members in the cardiac intensive care unit of S Hospital in Bucheon. Physiological stress responses such as blood pressure, heart rates, respiration rates, and oxygen saturation were measured using HP monitors. VAS was used to measure the emotional stress. Collected data was analyzed using repeated measure ANOVA, t-test by SPSS 17.0 statistical program. Results: The family visits did not change patients' blood pressure, pulse rate, respiration rate and oxygen saturation, However the anxiety level of patients and their family members were decreased significantly during family visits. Furthermore, 30-minute family visit reduced more effectively patient's anxiety than 15-minute family visit. Conclusion: Family visits need to be used as a means of nursing intervention to ease the emotional stress of patients and their families. In addition, increasing of visiting time should be considered.

• 한국해양학회지
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• v.21 no.4
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• pp.211-228
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• 1986

Variations of dissolved oxygen were studied for two years in two brackish lakes, Etang de Berre and Etang de Vaine related to the north-west Mediteranean Sea. The variations also were studied at the same time in nearby seawater, and in the four main tributaries of Etang de Berre. The distributions of dissolved oxygen values and their spatio-temporal variations were well matched with the characteristics of the water masses in different environments. The concentration of dissolved oxygen and the rate of oxygen saturation in seawater (Carry-le-Rouet) ranged from 5.0 to 6.0 ml.1$\^$-1/, and from 95 to 105%, respectively. The amount of dissolved oxygen in Etang de Berre oscillated between 0.17 and 11.43 ml.1$\^$-1/ with an average of 7.40ml1$\^$-1/.The rate of oxygen saturation oscillated between 2.9 and 168.3%. Annual values of the four tributaries are as follows (ml.1$\^$-1/ and %): Durance:8.68 and 113.6;Arc : 6.87 and 95.3;Touloubre: 6.87 and 91.0;Durancole;6.36 and 96.8 The data for the evolutions of dissolved oxygen in Etang de Berre on the period between 1965 and 1978 are presented. A rather good negative correlation links oxygen with temperatures.

• Journal of Korean Biological Nursing Science
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• v.17 no.2
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• pp.114-122
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• 2015

Purpose: This study attempted to test whether there are differences in the level and hemodynamic side effects (blood pressure, heart rate, $O_2$ saturation), and nausea & vomiting of spinal anesthesia using hyperbaric bupivacaine according to position (supine, lateral, and prone positions) in orthopedic surgery patients who received podiatric surgery under spinal anesthesia. Methods: This study was conducted with 53 patients who had received orthopedic surgery under spinal anesthesia at I General Hospital. Data were analyzed using SPSS 20.0 through repeated-measures ANOVA, post-hoc test, Chi-test, and Fisher's exact test. Results: The change of position after spinal anesthesia with hyperbaric bupivacaine caused a change in the level of spinal anesthesia (F=12.768, p<.001). However, no difference of blood pressure, heart rate, $O_2$ saturation and nausea and vomiting caused by the change in anesthesia level was observed, and in prone position, drug was administered for the correction of side effects. Conclusion: As expected, recognizing that there can be a change in the level of spinal anesthesia after the change of position in surgical patients, nurse anesthetists should monitor their conditions carefully and continuously.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.39 no.6
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• pp.869-875
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• 2019

The service level of the roundabout is estimated through an analytic model using the geometrical characteristics and parameter values obtained from the observations. Although a lot of researches have been conducted on the rotational intersection through an analytical model, the case of variable combinations is enormous, suggesting the range and service level of appropriate traffic volume according to the case study or limited characteristics through simulation. Therefore, in this study, the roundabout analysis model was constructed by using Visual Basic Application to make variable adjustment more easily. The constructed model analyzes traffic conditions according to various situations and analyzes the characteristics of roundabouts. As the result of analysis, the more the ratio of left turn and U-turn, the more the traffic distribution of each approached road was biased to one side, the limit traffic volume of the roundabout decreased and congestion appeared quickly. In particular, the more uneven the distribution of traffic was, the less the Saturation traffic volume was affected by the turnover rate.

• Korean Journal of Optics and Photonics
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• v.17 no.4
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• pp.305-311
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• 2006

We propose a 7-level atom model, which takes into account two-photon coherence effects in saturation absorption spectroscopy. Using this model we explained spectral change with laser intensity and some of crossover resonance lines, which cannot be explained with Nakayama theory. The 7-level model consists of two upper levels and five lower levels, which account for $\pi-\pi$ polarization of both pump and probe beams in Zeeman sub levels. We compared our 7-level model with 4-level Nakayama theory for 5S$_{1/2}$ - 5P$_{1/2}$ transition line in $^{85}$Rb atoms. The results of the 7-level model calculation agree well the saturation absorption spectra data according to laser intensities.

• Korean Journal of Medicinal Crop Science
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• v.10 no.1
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• pp.1-4
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• 2002

This study was carried out to know the effect of light intensity, temperature and $CO_2$ concentration on photosynthesis and transpiration in Hovenia dulcis Thunb. Light compensation point was $2.4\;{\mu}mol\;m^{-2}\;s^{-1}$ and light saturation point was $1033\;{\mu}mol\;m^{-2}\;s^{-1}$. The optimum temperature for photosynthesis was $25^{\circ}C$ at $1000\;{\mu}mol\;m^{-2}\;s^{-1}$ light intensity. $CO_2$ compensation point was 67 vpm and $CO_2$ saturation point was 707 vpm. Transpiration rate was increased to about $2\;mmol\;m^{-2}\;s^{-1}$ with increasing of light intensity to $1750\;{\mu}mol\;m^{-2}\;s^{-1}$ and to above $4\;mmol\;m^{-2}\;s^{-1}$ with increasing of temperature from $18^{\circ}C$ to $36^{\circ}C$. however It was gradually reduced as $CO_2$ concentration increased from 21 vpm to 800 vpm.