• The Journal of Korean Academy of Prosthodontics
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• v.38 no.5
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• pp.618-630
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• 2000

As Fiber-reinforced composite restorations cannot be made without leaving a marginal gap, luting cements play a pivotal role in sealing the margins as a prevention against margnal leakage. A recently introduced adhesive resin cement system is claimed to adhere chemically, as well as mechanically, to tooth substances, dental alloys and porcelain. But when considering the clinical variation conventional cementation using Zinc Phosphate and Glass-Ionomer can be requested. A vitro study was undertaken to compare microleakage and marginal fitness of Fiber-reinforced composite crowns(Targis/Vectris) depending upon luting cements. Fifty non-carious human premolar teeth were randomly divided into five experimental groups of 10 teeth each and luted with five luting cements. ($Bistite\;II^(R),\;Super-bond^(R),\;Variolink\;II^(R)$), Zinc phosphate and Glass-Ionomer cement) After 24 hours of being luted, all specimens were thermocycled 300 times through water bath of $5^{\circ}C\;and\;55^{\circ}C$ in each bath, then the quality of the marginal fitness was measured by the Digital Microscope and marginal leakage was characterized using Dye Penetration technique and the Digital Microscope The results were as follows : 1. The mean values of marginal fit were Bistite II($46.78{\mu}m$), Variolink II($56.25{\mu}m$), Super-Bond($56.78{\mu}m$), Glass-Ionomer($99.21{\mu}m$), Zinc Phosphate($109.49{\mu}m$) indicated a statistically significant difference at p<0.001. 2. The mean microleakage values of tooth-cement interface, restoration-cement interface were increased in the order of Variolink II, Bistite II, Super-Bond, Glass-Ionomer, Zinc Phosphate 3. Crowns luted with resin cement (Bistite II, Super-Bond, Variolink II, etc) exhibited less marginal gap and marginal leakage than those luted with conventional Glass-Ionomer and Zinc Phosphate cement. 4. The results indicated that all five luting systems yielded comparable and acceptable marginal fit.

• Journal of Bio-Environment Control
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• v.19 no.2
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• pp.93-96
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• 2010

Breaker stage tomato fruits that were stored at low temperatures show typical chilling symptoms such as uneven ripening and a high respiration. Experiments were performed to assess and compare these chilling injury symptoms of breaker stage tomato fruits, and to gather basic data that can be used to decide whether horticultural crops receive chilling injuries. Tomato fruits that had been sorted in the breaker stage were stored at $2^{\circ}C$ for 0, 3, 6, and 9 days, and then their respiration rates were measured at 3, 6, 9, 12, 24, 36, and 48 h after moving them to room temperature. This treatment was repeated twice on the same procedures, except the storage periods, which were changed to 0, 1, 2, 3, and 10 days. The respiration rate was increased in a 1 day storage treatment, and the increasing rate rose higher with extended storage periods. The $a^*$ value, which represents the surface color of tomato fruits, was measured 10 days after moving to them into room temperature. Those with an increased $a^*$ value rate got dull and showed uneven coloring after 2 days' storage treatment. These two factors, the respiration rate and $a^*$ value of the surface, showed a high correlation (r = 0.9716, p < 0.001). Therefore, the chilling injury of breaker stage tomato fruits can be diagnosed by measuring the respiration rate after moving them into room temperature, and the degree of chilling injury can also be assessed in terms of the respiration increase rate.

• Journal of Chest Surgery
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• v.37 no.6
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• pp.530-535
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• 2004

Background: Thoracoscopic R3 (above the third rib)sympathicotomy has been performed as an effective method in treating palmar hyperhidrosis because it is effective in eliminating the symptoms of hyperhidrosis and has lower degree of compensatory hyperhidrosis than that of sympathectomy. Most of the results published were based on the short-term follow up. So we evaluated the intermediate term follow up results of the R3 sympathicotomy. Material and Method: From April 1999 to August 2001, ninety-four patients with palmar hyperhidrosis had been treated by R3 sympathicotomy at the Inha University Hospital. Follow-up study was completed for 76 patients (male 38, female 38) and average follow-up period were 25$\pm$9.1 (15∼50) months. The sympathetic trunk passing above the upper border of third rib was divided by electric cautery. The patient's satisfaction after surgery was estimated using the analogue scale from score 0 to 100 (100 means perfect satisfaction). Result. The scale of patient's satisfaction immediately after operation was 92.36$\pm$9.93. After 15 months, the scale of satisfaction was decreased to average 71.80$\pm$20.24 and it is statiscally significant. The cause of dissatisfaction were compensatory hyper-hidrosis and recurrence of symptom. The degree of sweating immediately after operation was mean 0 and after 15 months it increased to mean 1.5. The degree of the compensatory hyperhidrosis immediately after operation was mean 1 and it increased to mean 5 after 15 months. Conclusion: R3 sympathicotomy has excellent therapeutic results immediately after operation but therapeutic effectiveness is becoming to decrease 15 months after operation. The common causes of dissatisfaction are compensatory hyperhidrosis and recurrence of hyperhidrosis.

• Korean Journal of Environmental Biology
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• v.37 no.3
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• pp.309-316
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• 2019

Cropland is a major source of atmospheric nitrous oxide (N₂O) and we need technologies in the field of agriculture that can reduce the presence of N₂O. In this study, a field experiment encompassing six treatments was conducted to determine the efflux of N₂O in cropland during the growing season. An experimental plot was composed of two main sectors, no-tillage (NT) and conventional tillage (CT), which were subdivided into three plots according to types of nitrogen (N) sources: CF, chemical fertilizer; HV, hairy vetch+chemical fertilizer; and RY, rye+chemical fertilizer. The cumulative N₂O emissions were 179.8 mg N₂O m^-2 for CF-CT, 108.1 mg N₂O m^-2 for HV-CT, 303.5 mg N₂O m^-2 for RY-CT, 86.7 mg N₂O m^-2 for CF-NT, 73.8 mg N₂O m^-2 for HV-NT, and 122.7 mg N₂O m^-2 for RY-NT during the fallow season. The CT, HV, and RY of no-tilled soils were reduced by 51.8, 31.7 and 59.6%, respectively (p<0.001). Our results indicate that the use of no-tillage and hairy vetch practice rather than conventional tillage and chemical fertilizer practice can decrease N₂O emission.

• Journal of the Korean Applied Science and Technology
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• v.35 no.3
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• pp.768-777
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• 2018

The purpose of this study was to investigate the effect of equality of both sexes and self-esteem on perception of dating violence among university students and presents basic data for helping healthy adaption of university life. A survey was held to the university students in Chungcheong cities from April 28 to May 12, 2018. of 225 copies of the questionnaire distributed, a total of 200 copies were in the final analysis. For data analysis, SPSS 21.0 for Windows was used. As a result, there were correlations between variables, the Perception of dating violence of university students were affected by the Equality of both sexes and Self-esteem. and the largest effect was the Violent experience. In conclusion, it is need to development program and counseling with considering healthy intimate relationship and right gender-role for improving adaption of university life.

• The Journal of the Korea Contents Association
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• v.17 no.11
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• pp.167-182
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• 2017

The purpose of this study is to examine the effects of care-giving stress of dementia elderly on the caregiver's suicidal ideation. In addition, mediating effect of self-efficacy was examined. In order to accomplish these purposes, a total of 336 who are caregivers of dementia elderly using self-report questionnaires. In this study, 325 elderly patients were used for final analysis. Date were analyzed by frequency and descriptive analysis, regression model analysis with SPSS 22.0. The analysis result of dementia elderly caregiver's symptoms showed that prevalence of suicidal ideation were 32.6%. Regression analysis was conducted under the control of dementia elderly's disease period, ratings, general characteristics and age, sex, educational background, occupation status, health status, living standard level of caregivers who were the subject of the survey. As a result, it was confirmed that the care giving stress had a statistically significant effect on suicidal ideation. Also, the self-efficacy of caregivers was found to partial mediate the relationship between care-giving stress and suicidal ideation(***p<.001). Based on this result, I suggested the various policies and the necessity of social welfare intervention to restore the mental health of caregivers of the elderly with dementia.

• The Journal of the Korea Contents Association
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• v.15 no.9
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• pp.223-232
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• 2015

This study has analyzed the factors that influence the safety consciousness of elderly drivers. To achieve this, 307 elderly who drives commercial and non-commercial in Daejeon, Sejong, Chungnam and Chungbuk area were selected as study subjects. For the data analysis, PASW Statistics 18.0 was used. The main results of this study are as follows. The level of safety consciousness of commercial and non-commercial drivers were 6.49 and 6.93 respectively showing that drivers of non-commercial were significantly higher. Second, the factors that influence the safety consciousness were shown to be significantly different for each group. The factors that influence the safety consciousness of commercial drivers were shown in the order of safety-seeking motivation, economic status, daily driving hours, sensation-seeking disposition. The factors that influence the safety consciousness of non-commercial drivers were shown in the order of safety-seeking motivation, health status, whether or not the accident was experienced, sensation-seeking disposition. Based on these results, several ways were suggested to improve the safety consciousness of elderly drivers and prevent the traffic accidents.

• Journal of Korean Society of Environmental Engineers
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• v.36 no.9
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• pp.648-658
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• 2014

We examined the effects of pollutants into sub-basin on the water quality and loading based on data surveyed during January-December 2013 from 13 sites of 5 streams in the Jinwi watershed. We used the contour plot and Kruskal-Wallis rank sum test to analyze seasonal variation of water quality and loading and Pearson correlation analysis to assess the relationships between pollutants and loadings. The significantly higher seasonal variation were SS, TN and TOC as compared to other water quality constituents (P < 0.001). A significant interaction existed between the effects of human population and the effects of discharge of Sewage Treatment Plant (STP) on water quality and loading, especially for the spring and winter seasons. It is necessary to control discharge water of sewage and wastewater from industrial facilities and to make full use of the watershed management system such as TMDLs in operation since 2012 for improvement in stream water quality.

• Journal of dental hygiene science
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• v.10 no.2
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• pp.95-100
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• 2010

The purposes of this study were to examine the effect of different fluoridated bleaching solution on the changes in physical and chemical characteristics of tooth. Forty-eight bovine incisors were divided into four groups to receive bleaching treatments, over a 14days period, as follows: no treatment; 10% carbamide peroxide (CP) bleaching; 10% CP containing 0.05% fluoride; and 10% CP containing 0.1% fluoride. All the specimens were highly polished and discolored with commercial COCK.Color and enamel changes were determined with colorimeter, microhardness tester, scanning electron microscope, atomic force microscopy. All the collected data were analyzed with one-way ANOVA. After the bleaching, bleached groups showed the color change(E*). Microhardness of 10% CP group decreased after tooth bleaching. But microhardness of containing fluoride bleached groups increased after tooth bleaching. Enamel surface of 10% CP bleached group showed any apparent morphology and roughness changes compared to the enamel which was stored in distilled water only. These results demonstrated that Fluoridated 10% Carbamide Peroxide have appreciable bleaching effect on bovine teeth and were not adversely affects enamel. Supporting influence of fluoride-containing bleaching solution on remineralization could be observed and further research must be carried out in various active environments to confirm these results clinically.

• Journal of the Korea Convergence Society
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• v.9 no.5
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• pp.203-218
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• 2018

The aim of this study was to develop the Equine Assisted Activities and Therapies(EAAT) screening tool for children and adolescents, which can be available for the EAAT instructors to screen potential participants in the riding center. The preliminary screening tool was developed by six experts and several international guidelines were used for the references. A two-round Delphi study was performed with 23 experts. Panel members were asked to rate their (dis)agreement with each tool's item on an 11-point scale. The consensus was considered to be reached when the item was scored more than 8. The consensus was reached on 39 items out of 48, resulting the final screening tool's items are to be 39. The resulting screening tool could contribute to make safer EAAT settings for participants and the future investigations in adult subjects will be needed.