• Restorative Dentistry and Endodontics
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• 제25권4호
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• pp.575-586
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• 2000

In this study, adaptation of compomer to saliva contaminated dentin was evaluated with scanning electron microscope(SEM) and confocal laser scanning microscope(CLSM). For the SEM study, the occulusal surfaces of thirty two molar teeth were grounded to exposure dentin surfaces. The specimen were randomly assigned to control and three experimental groups with four samples in each group. In control group, Dyract and F-2000 compomer were bonded on the specimens according to the manufactures direction. Experimental groups were subdivided into three groups. They were contaminated with saliva on dentin surfaces ; Experimental group 1 : Saliva was dried with compressed air. Experimental group 2 : Saliva was rinsed with air-water spray and dried. Experimental group 3 : After polymerization of an adhesive, they were contaminated with saliva, and then saliva was rinsed with air-water spray and dried. Dyract and F-2000 compomer were bonded on saliva-treated dentin surfaces. The interfaces between dentin and compomer were observed with SEM. For the CLSM study, Class V cavities were prepared in buccal and ligual surfacess of thirty two molars. The specimens were divided into control and experimental groups. Class V cavities in experimental group were contaminated with saliva and those surfaces in each experimental groups received the same treatments as for the SEM study. Cavities were applied Prime & Bond 2.1 and F-2000 compomer primer/adhesive that were mixed with fluorescein, and then were filled with Dyract and F-2000 compomer. Specimens were embedded in transparent acrylic resin and sectioned buccolingual1y with diamond wheel saw, and then mounted on cover slide for CLSM study. The interface between cavity and compomer was observed by fluoresence imaging with a CLSM. The results were as follows : 1. In SEM exammination of Dyract group, control group, experimental group 2, 3 showed close adaptation to dentin and hybrid layer of $3{\sim}4{\mu}m$ diameter. Interfacial gap between compomer and dentin in experimental group 1 was wider than in control group. 2. In SEM examination of F-2000 group, adaptation to dentin of control group was closer than Dytact control group, but hybrid-like layer was not observed. Interfacial gap between compomer and dentin in experimental group 1 was wider than in Dyract experimental group 1. 3. In dissolution specimens of Dyract and F-2000 group, resin tags penetrated through dentinal tubules in control group and experimental group 1 and 3, but the penetration of resin tag was irregular and partial in experimental group 1. 4. In CLSM exammination of Dyract and F-2000 group, adhesive patterns of control and experimental groups showed same as in SEM. This result suggests the treatment methods, rinsing & drying, repeating all adhesive procedures, will produce good effect on adaptation of compomer to dentin if the dentin surface or polymerized adhesive is contaminated by saliva.

• 대한가정학회지
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• 제26권2호
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• pp.69-79
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• 1988

This study was to increase the experimental learning effect of textile materials in middle and high school. To this study, three kinds of simply devised apparatus were used for warmth retaining test, air permeability test and static electricity test. Two classes were chosen in a girls' high school comparing learning effect and classified the theoretical learning group and the experimental learning group. In the experimental group, a teaching plan to teach the properties of textile materials was made to use these apparatuses. The results were. 1. In the interest on the unit either the theoretical learning group or the experimental learning group were not different significantly. 2. In the items facilitation of motivation, unsatisfied desires and prevention of failure, effect of transfer and development of inquiry power, both groups were significant. 3. For the purpose of comparing the learning effect, two groups were examined for determining the level of understanding after teaching properties of textile materials. The mean value of the experimental learning group was higher than that of the theoretical learning group. The experimental learning group had more higher markers(over the point of 90) than the theoretical learning group.

• Child Health Nursing Research
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• 제28권3호
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• pp.167-175
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• 2022

Purpose: The present study aimed to develop and examine the effectiveness of a pediatric nursing competency-building program for nursing students. Methods: This was a quasi-experimental study with a nonequivalent control group pretest-posttest design conducted between October and December 2021. The participants included 40 nursing students (20 each in the experimental and control groups) at a university in a South Korean city. The pediatric nursing competency-building program integrated problem-based learning and simulation into clinical field practice. The experimental group participated in the program, while the control group did not. Data were analyzed using the 𝑥² test, the independent t-test, and repeated-measures analysis of variance. Results: Pediatric nursing competency and clinical performance showed a greater increase in the experimental group than in the control group. However, the change in problem-solving ability in the experimental group was not significantly different from that in the control group. Conclusion: The pediatric nursing competency-building program effectively improved students' pediatric nursing competency and clinical performance.

• Steel and Composite Structures
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• 제23권6호
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• pp.647-656
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• 2017

This paper presents an experimental study on the behaviour of steel beams with different types of web openings. Steel beams with web openings became progressively more accepted as a well-organized structural form in steel construction since their existence. Their complicated design and profiling method provides better flexibility in beam proportioning for strength, depth, size and location of holes. The objective of this study is to carry out the experiments on steel beams with different types of web openings and performed non-linear finite element (FE) analysis of the beams that were considered in the experimental study in order to determine their ultimate load capacity and failure modes for comparison. Ten full scale models of steel beam with web openings have been tested in the experimental investigation. The finite element method has been used to predict their entire response to increasing values of external loading until they lose their load carrying capacity. FE model of each specimen that is utilized in the experimental studies is carried out. These models are used to simulate the experimental work to verify test results and to investigate the nonlinear behaviour of failure modes such as local buckling, lateral torsional buckling, web-post buckling, shear buckling and Vierendeel bending of beams.

• 기본간호학회지
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• 제6권3호
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• pp.583-596
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• 1999

The purpose of this study was to examine the effect of self-care of abdominal surgery patients in surgical intensive care unit after offering preoperative nursing information. This study worked out nonequivalant control group post test only design as suspected experimental study. This subjects of the study were 45 patients, 23 in experimental group and 22 in control group. This study was carried at a university hospital in Taegu between January 12, 1999 and March 13, 1999. The experimental group was supplied with preoperative nursing information and the control group received routine care in ICU. The measuring tools of this study were assessment of the self-care role behavior. The data were analyzed by SPSS computer program, $x^2-test$ and t-test and ANOVA were utilized for testing the difference between the experimental and the control group. The hypothesis was examined by t-test. The result of this study are summarized as follows ; 1) The hypothesis, 'The experimental group will show a higher level of self-care than the control group' was accepted(t=-8.958, p=.000). 2) We could not find any meaningful relation about general characteristics and disease associated characteristics between the experimental and the control group. 3) The self-care behavior scores according to the general characteristics and disease associated characteristics show significant statistical difference by economics status (p=.033). 4) The rate of self-care behavior scores of each questionnaire are below average in the questions that request active activity to prevent postoperative complications From the result of this study, the self-care of the experimental group was higher than those of the control group, and the nursing information can be regarded as an effective nursing intervention for preoperative patients.

• 한방안이비인후피부과학회지
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• 제24권3호
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• pp.84-107
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• 2011

Purposes : The purpose of present study is to detect the effects of ointment contained Takrisodok-Eum on the skin barrier's recovery of the Atopic dermatitis. Methods : A total of 44 patients who visited Semyung Oriental Medical Center from April 27th, 2011 to September 20th, 2011 were included in the study. In this study, the patients were treated with Takrisodok-Eum (experimental group) and positive control group. For 8 weeks of gross examination, hematological examination and instrumental asessment were made before and after the study to examine how well the products for experimental group with those for control group in recovering the damaged skin barriers by Atopic dermatitis. Results : 1. In the primary endpoint, SCORAD Index showed a statistically significant decline in experimental group. 2. In the secondary endpoint index of skin hydration, both the experimental group and the control group showed statistical significance. 3. In the secondary endpoint index of TEWL, the experimental group showed greater statistical significance than the control group. 4. In the secondary endpoint index of skin pH, skin pH showed a statistically significant decline in both the control group and the experimental group within the normal range. 5. In the secondary endpoint index of Total IgE, Eosinophil count, IL-10, IL-13, both the experimental group and the control group showed no statistical significance. 6. To evaluate the safety of the products for the human body, hematological examination and hematological biochemical examination, vital sign check were conducted; both control group and experimental group showed no abnormal level. And There were no severe adverse events during this study. Therefore, it is suggested that the safety of the products, if used for certain period, should be safe for the human body. Conclusions : According to the above experiments, it is suggested that Takrisodok-Eum should be effective for the Atopic dermatitis.

• International Journal of Ocean System Engineering
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• 제2권1호
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• pp.1-7
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• 2012

The cross-shore sediment transport in a coastal region causes the important changes in beach morphological properties. The accurate estimation of the cross-shore sediment transport is important for the designing of the marine structures such as seawalls, jetties, breakwaters etc, and the preventing coastal erosion and accretion due to on-off shore sediment transportation. In this study, the experiments on cross- shore sediment transport carried out in a laboratory wave channel for initial beach slopes of 1/8, 1/10 and 1/15. Using the regular waves with different deep-water wave steepness generated by a pedal-type wave generator, the geometrical characteristics of beach profiles under storm conditions and the parameters affecting on-off shore sediment transport are investigated for the beach materials having medium diameters of $d_{50}$=0.25, 0.32, 0.45, 0.62 and 0.80 mm. The experimental results obtained from this study compared with previous experimental work and found to be of the same magnitude as the experimental measurements and followed the expected basic trend.

• 음성과학
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• 제12권2호
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• pp.59-72
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• 2005

The purpose of this study was to investigate the effects of rhythm therapy program on MPT(Maximum Phonation Time) and acoustic parameters in patients with Parkinson's disease. The therapy program utilized 5 Korean traditional rhythms: jinngyang, jungmori, jungjungmori, jajinmori, and semachi. The therapy consisted of counseling regarding vocal hygiene and actual therapy procedures. Six subjects with Parkinson's disease participated in the study; 3 subjects in experimental group and the other 3 subjects in control group. The pre- and post- acoustic analyses were performed in both groups. The results of this study were as follows; 1) MPT was significantly increased in the experimental group, 2) mono-pitch was significantly improved in the experimental group, 3) mono-loudness was significantly improved in the experimental group, and finally, HNR was significantly increased in the experimental group compared to the control group.

• International Journal of Computer Science & Network Security
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• 제22권5호
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• pp.266-276
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• 2022

The study aimed to pinpoint the effects of an educational environment based on gamification on developing achievement motivation among first-grade intermediate students. Using an achievement motivation scale, the study adopted a quasi-experimental design with experimental and control groups. The sample consisted of 52 students selected randomly from the first-grade intermediate students. They were studying in public intermediate schools in Jeddah at the time of this study. They were divided into two groups. The control group (n=24 respondent), and the experimental group (n=28 respondent). The results showed statistically significant differences at the level α ≥ 0.05 between the mean scores of the experimental group and the control group in the posttest of the achievement motivation measurement in favor of the experimental group. The study recommended using gamification in designing computer curricula and courses across educational stages in Saudi Arabia. It also recommends training the computer and information technology teachers on using gamification in their teaching.

• 지역사회간호학회지
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• 제25권2호
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• pp.146-157
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• 2014

Purpose: The objective of this study is to analyze systematically the trends of experimental researches in the area of community health nursing. Methods: This is a study based on literature review, which analyzed 137 experimental research papers in the Journal of Korean Academy of Community Health Nursing, from the first issue in 1989 to those in 2012. Results: 1) The proportion of experimental researches in the total published papers was 14.9%. 2) The mainly used research method was quasi-experiment, which was 60.6% of them, and there was no RCT. 3) Convenient sampling was used in 95.6% of the researches. 4) Only 5.1% were reviewed for keeping the ethical standards for the study objects by the IRB. 5 When classified by the Omaha Classification System, psycho-social researches were most frequent, which were followed by physiological, health-related behavioral, and environmental ones in order of frequency. Conclusion: This study found that the proportion of experimental research papers was increasing in the 2000s and ethical standards were required more rigorously. However, it was suggested that the research design be more elaborated and sampling methods be manifested to reduce research bias and errors.