• Journal of the Korean Wood Science and Technology
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• v.14 no.4
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• pp.21-28
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• 1986

Plywood used for construction as a decorative inner material is inflammable and can fire accident, causing destruction of human life and property. In this study, 3.5mm Kapur plywoods were soaked in the 23% monoammonium phosphate solutions by cold soaking method 3, 6, 9hrs and hot-cold bath method for 3/3hrs, and redrying was carried out by press-drying at the platen temperature of 110, 130, 160, 180$^{\circ}C$, and then fire test was carried out to investigate burning point, flame exhausted length, frame spread length, back side carbonized area and weight loss. The results are as follows; 1. In cold soaking method for 3, 6, 9hrs. retentions of monoammonium phosphate were 0.377, 0.448, 0.498kg/(30cm)$^3$ respectively, and in hot-cold bath method for 3/3hrs, the retention was 1.331kg(30cm)$^3$ that exceeded the minimum retention 1.124kg/(30cm)$^3$. 2. Correlation coefficients among the variable were shown in table 2. From the table, it could be recognized that there were close negative correlations between the treatment and burning point, flame spread length, back side carbonized area, flame exhausted time and weight loss, and there was negative correlation between treating time and back side carbonized area, but there was positive correlation between platen temperature and burning point. 3. From table 3, it can be observed that there were highly significant differences for burning point, flame spread length, flame exhausted time, back side carhonized area, weight loss between treatments. And in 2-way interactions, there were also highly significant for burning point, flame spread length, flame exhausted time, weight loss between time x treatment. 4. It was observed that burning point, flame exhausted time, flame spread length, back side carbonized area, and weight loss in fire-retardant treated plywood were the best effects in fire-retardant treated plywood, water treated plywood and nontreated plywood. In conclusion, I can estimate that absorbed chemical contents by hot-cold bath method for 3/3hrs, have a lot of effects on fire-retardant factors such as burning point, flame spread length, flame exhausted time, backside carbonized area and weight loss, but platen temperatures have a little effects on the fire factors.

• Korean Journal of Air-Conditioning and Refrigeration Engineering
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• v.15 no.9
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• pp.768-778
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• 2003

Numerical analysis has been carried out to investigate laminar convective heat transfer in a tube for supercritical water near the thermodynamic critical point. Fluid flow and heat transfer are strongly coupled due to large variations of thermodynamic and transport properties such as density, specific heat, viscosity, and thermal conductivity near the critical point. Heat transfer characteristics in the developing region of the tube show transition behavior between liquid-like and gas-like phases with a peak in heat transfer coefficient distribution near the pseudocritical point. The peak of the heat transfer coefficient depends on pressure and wall heat flux rather than inlet temperature and Reynolds number, Results of the modeling provide convective heat transfer characteristics including velocity vectors, temperature, and the properties as well as the heat transfer coefficient. The effect of proximity to the critical point is considered and a heat transfer correlation is suggested for the peak of Nusselt number in the tube.

• Journal of Environmental Impact Assessment
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• v.17 no.1
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• pp.1-9
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• 2008

Non-point pollution is caused by many diffusive sources, unlike a point pollution derived from industrial wastewater treatment plants or sewage treatment plants. Runoff of non-point pollutants is originated from rainfall or thawing in short period of time moving over and through the a ground surface. They cause ill effect on the quality of neighboring aquatic environment. To prevent effectively the wash off from non-point pollutant, it should be immediately reduced at the source or be treated after gathering of runoff water. This study has been carried out for the best width of riparian buffer zone. So we implemented the experiment in terms of its depth, width and kind of vegetations and calculated the reduction of pollutants loading. The experimental zone encompasses the watershed of Namhan River (Kyunggido Yangpyunggun Byungsanri). The region was divided into 5 land cover sectors : grass, reed, pussy willow, mixed(grass+pussy willow) and natural zone to compare effectiveness of vegetation. Water samples from four points have been collected in different depths. And the pollutant removal efficiency by sectors with different plant species was yielded through influent with one of each sample. And we obtained the correlation between the width of riparian buffer zone and the removal efficiency of pollutants. Using correlation result, the width of riparian buffer zones which needs to improve the water quality of river could be derived.

• Journal of Periodontal and Implant Science
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• v.31 no.3
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• pp.633-640
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• 2001

As the public becomes concerned with looking younger and healthy, aesthetic considerations will become more relevant to dental treatment planning. The purpose of this study was to evaluate the relationship between interdental papilla existence and the distance from contact point to interdental alveolar crest in the maxillary anterior dentition of korean. Fifty-nine Korean adult consist of adults. 34 males and 25 females participated in the study. Papilla Index(PI) was recorded. The distance between contact point and interdental alveolar crest was measured by sounding with Williams probe. Measurement were carried out in 257 maxillary anterior interproximal area. The results showed that mean PI was 1.95 and mean distance between contact point and interdental alveolar crest was 5.07mm. The correlation between the papilla index and distance was negative and statistically significant(r=-0.819; p=0.000). A high negative correlation existed between PI and distance from contact point to alveolar crest. When the distance between contact point and alveolar crest was 4mm, the papilla got lost on a half of all cases. When the distance was 5mm, the papilla was present almost 11%. When the distance was 6mm, the papilla was present 4%. When the distance was 7mm or more, the papilla was lost in all cases.

• Journal of Conservation Science
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• v.34 no.5
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• pp.387-396
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• 2018

Exposure to the natural environment can cause damage to domestic wooden cultural assets, such as temples. Deterioration is accelerated by biological damage and various environmental factors. In this study, meteorological factors were monitored by equipment installed at Beopjusa temple of Boeun province and Seonamsa temple of Suncheon province. A statistical model was applied to these data to predict the meteorological factors and to compare the predictive performance of each meteorological factor. The resulting correlation coefficient between air and dew point temperatures was highest, at 0.95, while the correlation coefficient for relative humidity had a moderate value(0.65) at both the Beopjusa and Seonamsa temples. Thus, a general linear model was found to be suitable for predicting air and dew point temperatures. An analysis of correlation between meteorological factors showed that there was strong positive correlation between air temperature and dew point temperature, and between solar radiation and evaporation at both sites. There was a weak positive correlation between air temperature and evaporation at Beopjusa temple. Wind speed was negatively correlated with both air temperature and relative humidity at Seonamsa temple. The wind speed at this location is higher than average in winter and lower than average in summer, and it was hypothesized that the low wind speed plays a role in reducing water evaporation in summer, when both air temperature and relative humidity are high. As a result, damage to the wooden buildings of Seonamsa temple is accelerated.

• Journal of Digital Convergence
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• v.20 no.4
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• pp.433-441
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• 2022

The purpose of this study was to identify the moderated effects of emotional intelligence on the relationship between academic stress and smartphone addiction among high school students. Subjects were 207 associate high school students. The data were collected using self -report questionnaire from December 1 to December 23, 2019. Data were analyzed by descriptive statistics, t-test, ANOVA, pearson correlation and hierarchical multiple regression with SPSS/WIN 23. Mean point of academic stress(5 point scale) was 2.75, emotional intelligence(5 point scale) was 3.63 and smartphone addiction(4 point scale) was 2.18. Academic stress were negative correlation with emotional intelligence(r=-.15, p =.030) and positive correlation with smartphone addiction(r=.25, p<.001). Emotional intelligence were negative correlation with smartphone addiction(r=-.25, p<.001). Emotional intelligence has been shown to modulate the relationship between academic stress and smartphone addiction(F=10.45. p<.001) Therefore, to decrease the academic stress and smartphone addiction of high school students, It is necessary to develop the program for increase emotional intelligence of high school students.

• Journal of Digital Convergence
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• v.17 no.11
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• pp.387-394
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• 2019

The purpose of this study was to identify the moderated effects of emotional intelligence on the relationship between transition shock and adaptation on clinical practice among nursing students. Subjects were 185 associate nursing students associate nursing students(3rd). The data were collected using self -report questionnaire from May 1 to June 14, 2019. Data were analyzed by descriptive statistics, t-test, ANOVA, Pearson correlation and hierarchical multiple regression with SPSS/WIN 23.0. Mean point of transition shock(4 point scale) was 2.32. Mean point of emotional intelligence(5 point scale) was 3.61, and adaptation on clinical practice(5 point scale) was 3.40. Transition shock were significantly negative correlation with emotional intelligence(r=-.26. p <.001) and adaptation on clinical practice(r=-.43. p <.001) in nursing students. Emotional intelligence were significantly positive correlation with adaptation on clinical practice(r=.36. p <.001). Emotional intelligence has been shown to modulate the relationship between transition shock shock and adaptation on clinical practice(${\Delta}R^2=0.21$, p <.001). Therefore, to decrease the transition shock and to increase the adaptation on clinical practice of nursing students, It is necessary to develop the program for increase emotional intelligence of nursing students.

• Journal of Korean Academy of Nursing Administration
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• v.1 no.2
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• pp.349-371
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• 1995

Professional nurse shall possess the firm nursing idea and ethical nursing philosophy based on the professional knowledge and technology but due to the rapid social situations has changed the value to man thus the nurse's sense of value in the nursing secenes has been confused and changed bringing the new ethical problems and discord due to the ethically difficult problems. This study is aimed to know about the discord between the ruling ethical sense of value and the ethical discord exeriencing in the clinical scenes of the nurse and to help them establish affirmative ethical sense of value and provide them with the materials which can effectively meet the ethical discord. The study research has been conducted by selecting 515 clinical nurses in 8 general hospitals as the subject from Mar. 13, 1995 to Apr. 3. The tool measuring the ethical sense of value disigned by Lee, Young Sook has been used and supplemented and the tool measuring the ethical discord was the question papers about the ethical dillemma of Han, Sung Sook. The collected materials have been analyzed by the statistical methods of arithmetical everage, t-test, ANOVA, Pearson's Correlation Coefficient and etc. The result of the study is as the below ; 1) The average point of the ethical sense of value of the nurse was 3.62(maximum point : 5) which showed that the ethical level was so high and the highest question item in the ethical level of the whole items of the ethical sense of value was "They conduct as directed by the doctor in case the disposition of the doctor looks mistaken"(4.56 point), "They keep the secret of the patients while serving them."(4.56) and the lowest item was "using placobo for the patients is not allowed" : (1.85 point). 2) Statistical variation which showed the significant difference in the relation with the ethical sense of value according to the general characters of the nurse has shown as scholarly years(F=3.47, p=.016), religion(F=1.66, p=.004), interest degree of ethical education(F=4.18, p=.006),attitude to the job of nursing(F=6.76, p=.006), ethical standard(F=3.28, p=.021), and recognition degree on ethical principles(F=4.53, p=.001). 3) The average point of the ethical discord of the nurse was 0.54(The maximum-1 point) point and the ethical discord in the clinical scenes : "the problems arising from the lack of manpower of the nurse"(0.86), "the discord from the uncooperative relation between them and the medical staff and"(0.75) and indifference of the doctor about the report of the nurse(0.73). 4) The variation which showed the significant difference statistically in the ethical discord according to the general characters of the nurse was that Age(F=19.88, p=.000), schooling(F=5.32, p=.001), Experience(F=15.77, p=.000), position(F=13.58, p=.000) and ethical standard(F=2.63, p=.049). 5) The results of the analysis of correlation between ethical sense of value and discord(r=0.519, p=.239) showed no significant correlation statistically.

• The Transactions of The Korean Institute of Electrical Engineers
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• v.61 no.9
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• pp.1340-1349
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• 2012

Increasing the oxidation of fat through exercise is the recommendable method for weight control. Preceding researches have proposed increase in the usage of fat during exercise in stabilized state and under maximum exertion through aerobic training. However, such researches require additional equipment for gas analysis in order to measure the caloric value or gas exchange of subjects during exercise. Such equipments become highly restrictive for those exercise and cause substantially higher cost. According to this, we have presented the method of estimating the maximal fat oxidation point through changes in LF & HF which reflects changes in heart rate and the autonomic nervous system in order to induce exercise for a less restrictive and efficient fat oxidation than existing methods. We have conducted exercise stress test on subject with similar exercise abilities, and have detected the changes in heart rate and changes in LF & HF by measuring changes in fat oxidation and measuring ECG signals at the same time through a gas analyzer. Changes in heart rate and HRV of the subjects during exercising was detected through only the electrocardiographic signals from exercising and detected the point of maximum fat oxidation that differs from person to person. The experiment was carried out 16 healthy males, and used Modified Bruce Protocol, which is one of the methods of exercise stress test methods that use treadmill. The fat oxidation amount during exercise of all the subjects showed fat oxidation of more than 4Fkcal/min in the exercise intensity from about 5 minutes to 10 minutes. The correlation between the maximal fat oxidation point obtained through gas analysis and the point when 60% starts to be relevant in the range from -0.01 to 0.01 seconds for values of R-R interval from changes in heart rate had correlation coefficients of 0.855 in Kendall's method and in Spearman's rho, it showed significant results of it being p<0.01 with 0.950, respectively. Furthermore, in the changes in LF & HF, we have determined the point where the normalized area value starts to become the same as the maximal fat oxidation point, and the correlation here showed 0.620 in Kendall and 0.780 in Spearma of which both showed significant results as p<0.01.

• Journal of Korean Ophthalmic Optics Society
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• v.20 no.2
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• pp.255-261
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• 2015

Purpose: purchasing status and understanding trends of Functional progressive addtions lenses buyers', Correlation analysis of the Binocular Function value to determine ADD then can be apply sales and prescriptions. Methods: Years 2011 to 2014, 298 patients who were prescribed functional progressive lenses were analysed based on the prescription data and SPSS (Ver. 20.0) was treated using the statistics. Results: Results: The average age of our customers are $27.66{\pm}11.55$ years, average addition power is $+0.73{\pm}0.36D$, customers are using take a prescription of ADD $+0.75{\pm}0.28D$ was the highest 44.33% to 132 people. Near point of convergence of 276 people (92.62%) was mostly less than 10 cm, and near point of accommodation of 134 people (44.97%) was also below 10 cm, within 11~15 cm were 122 people (40.94%). Most of people were within normal range in terms of Near point of convergence and near point of accommodation, near point of accommodation tend to be longer than Near point of convergence. As you can see this result shows most of customers need extra help in their near point of accommodation instead of they are leak at it. FCC (Fused cross cylinder) check Value and ADD (addition power) tests showed that the value of a strong correlation (p=0.00), NPC and NPA were also p=0.001, the correlation of the NPC and ADD is p=0.003, In addition, NPA and ADD also showed a significant correlations (p=0.005). Near Point of Accommodation, negative relative accommodation, and positive relative accommodation are all significantly correlated (p=0.00). The short distance-related variables of the ADD which are NPC, NPA, Age, also appeared to side correlate significantly with each other. Conclusion: Binocular function values of the subjects were highly correlated with each other so precise examination is required. when Age young people are working at short distance, low ADD values was prescribed for solving discomfort. So, in the case of early presbyopia, accommodative insufficiency, or people feel fatigue when they often working at near although their accommodation function is normal, when functional progressive lenses are prescribed, expectation of this should be exactly notified.