• Journal of KIISE:Databases
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• v.41 no.4
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• pp.256-261
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• 2014

The problem of top-${\kappa}$ set similarity joins finds the top-${\kappa}$ pairs of records ranked by their similarities between two sets of input records. We propose an efficient algorithm to return top-${\kappa}$ similarity join pairs using a sampling technique. From a sample of the input records, we construct a histogram of set similarity joins, and then compute an estimated similarity threshold in the histogram for top-${\kappa}$ join pairs within the error bound of 95% confidence level based on statistical inference. Finally, the estimated threshold is applied to the traditional similarity join algorithm which uses the min-heap structure to get top-${\kappa}$ similarity joins. The experimental results show the good performance of the proposed algorithm on large real datasets.

• The Mathematical Education
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• v.56 no.2
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• pp.147-160
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• 2017

The purpose of this study was to examine (1) if sociocultural factors that are known to influence gender gap in mathematics achievement are gender equitable for Singaporean eighth grade students, (2) if there is a higher level of gender equitability in students' attitudes towards mathematics and (3) how sociocultural factors influence mathematics achievement for Singaporean eighth grade students. This study is based on 5,923 Singaporean eighth grade students who participated in TIMSS 2011 assessment. The study found that there were no statistically significant gender differences in 'parental involvement in education' and 'teacher efficacy.' There were no statistically significant gender differences in students' attitudes of 'like learning mathematics,' and 'value learning mathematics'. A significant gender difference was identified for the attitude of 'confident with mathematics.' The boys displayed a higher level of confidence in mathematics than the girls consistent with other study findings for Asian students. The degree of effect from 'parental involvement in education,' 'teacher efficacy,' and 'confident with mathematics' on mathematics achievement are found to be stronger for girls than boys. The finding implies that girls' mathematics achievement can benefit from having more positive encouragement and involvement of parents and teachers and strengthening confidence in mathematics.

• Journal of Korean Society on Water Environment
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• v.28 no.5
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• pp.646-656
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• 2012

This study area was Saemangeum Reservoir in Korea and the applied model was Environmental Fluid Dynamics Code(EFDC). It was the same as the scenarios to the boundary and initial conditions except the resolutions of the model grids. The resolutions were about 800 and 2,000 cells. It was considered scenario 1 and 2. The model was performed to simulate the water temperature, salinity, water quality parameters such as dissolved oxygen(DO), chemical oxygen demand(COD), total nitrogen(T-N), and total phosphorus(T-P) at 2008. The simulation results of the two scenarios were reflected in the trend of observed data tolerably. However, water flow, water temperature, and salinity showed high confidence level at the scenario 1. The water quality items did not present high confidence level at the scenario 1 because which concept was considered to biochemical and physical processes. This result shows that grid resolution has an influence on the water transport and the effect is reflected directly shallow and narrow water area. But, the selection of grid resolution should be considered the purpose of model simulation and the process of target items.

• The Journal of Korean Academic Society of Nursing Education
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• v.16 no.2
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• pp.339-346
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• 2010

Purpose: Bystander cardiopulmonary resuscitation (CPR) improves survival. However, there have been few studies on the performance of bystander CPR in Korea. This study was done to identify the reasons for being unwilling to perform CPR, and to investigate the factors associated with performing CPR on a stranger in an emergency situation. Method: The participants in this study were 444 local residents. Data were collected by using self-reported questionnaires from May 1 to June 30, 2010. For data analysis, descriptive statistics and multiple logistic regression were performed using SAS version 9.1. Result: Only 32.2% of respondents reported being willing to perform CPR on a stranger. The major reason for not being willing to perform CPR on a stranger was "have no confidence to perform CPR well". From multiple logistic regression analysis, statistically significant predictors of CPR performance on a stranger were found to be a higher educational level (OR=6.11, 95% CI 1.46-25.52), neighbors with angina pectoris or myocardial infarction (OR=6.65, 95% CI 3.93-11.24), and having confidence of performing CPR (OR=3.02, 95% CI1.78-5.14). Conclusion: CPR education (including automatic external defibrillator) should be offered to family members and neighbors. In addition, the Good Samaritan Law must be given wider publicity at the national level.

• Environmental and Resource Economics Review
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• v.15 no.5
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• pp.921-937
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• 2006

In this paper, we apply fuzzy theory in a discrete choice Contingent Valuation Method(CVM) in order for dealing preference uncertainty problem. Fuzzy membership function is used in an empirical analysis to estimate the willingness-to-pay(WTP) for the preservation of the endangered Asiatic Black Bear in Korea. The estimated WTP was about 9,090 Korea Won per household with 78 percent of confidence level. The advantage of applying fuzzy theory in the valuation method could be found in its ability to measure the confidence level of the estimated WTP.

• Environmental Mutagens and Carcinogens
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• v.20 no.1
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• pp.21-25
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• 2000

Recently there is increasing interest in the use of structure activity relationships for predicting the biological activity of chemicals. The reasons for the interest include the decrease cost and time per chemical as compared with animal or cell system for identifying toxicological effects of chemicals and the reduction in the use of animals for toxicological testing. This study is to test the validity of the mutagenicity data generated from QSAR (Quantitative Structure Activity Relationship) program. Thirty chemicals, which had been evaluated by Ames test during 1997-1999, were assessed with TOPKAT QSAR mutagenicity prediction module. Among 30chemicals experimented, 28 were negative and 2 were positive for Ames test. On the contrary, 23 chemicals showed the high confidence level indicating high prediction rate in mutagenicity evaluation, and 7 chemicals showed the lsow to moderate confidence level indicating low prediction in mutagenicity evaluation. Overall mutagenicity prediction rate was 77% (23/30). The prediction rates for non-mutagenic chemicals were 79% (22/28) and mutagenic chemicals were 50% (1/2). QSAR could be a useful tool in providing toxicological data for newly introduced chemicals or in furnishing data for MSDS or in determining the dose in toxicity testing for chemicals with no known toxicological data.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.26 no.4D
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• pp.549-551
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• 2006

Vehicle License Plate Recognition System reads information from vehicles license plate using image detection devices. Of many applications provided by Vehicle License Plate Recognition System, some, such as speed enforcing system, can be problematic when the system incorrectly scans letters or numbers from a vehicle's license plate. Using Cautious Classifier avoids such problems by discarding the scanned information when the confidence level is doubted to be low. This study develops the License Plate Recognition System using Cautious Classifier and investigates effectiveness of applying the Weighted Instance Method to improve the performance of Cautious Classifier.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.21 no.8
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• pp.379-387
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• 2020

This exploratory study evaluated various factors influencing the level of nursing self-confidence in the performance of core nursing skills among nursing students. This study surveyed 131 senior nursing students in U city with a structured self-report questionnaire analyzed by SPSS 23.0 software. The average perception scores for importance, problem-solving process, and self-confidence in the performance of core nursing skills were 4.73, 3.57, and 3.90, respectively. The most significant factors affecting self-confidence in the performance of core nursing skills included problem-solving process (β=.33, p=.001) and nursing satisfaction (β=.27, p=.019). These variables explained 15% of the total variance in self-confidence in the performance of core nursing skills. Based on the results of this study, it is necessary to perform research in order to improve the self-confidence of performing core basic nursing skills among nursing students, and the department of nursing defines students' problems by suggesting changes in the practice environment and various nursing situations to improve interpersonal skills. Therefore, it is necessary to develop a curriculum that can be solved and a program to increase nursing satisfaction.

• Journal of Korean Home Economics Education Association
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• v.29 no.4
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• pp.101-116
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• 2017

This study aimed to investigate the determinants of confidence in courtship and marriage, childbirth and parenting of the unmarried employed of the echo boomers born between 1982-1992, using data from the 19th wave of the nationwide Korea Labor and Income Panel Study. The differences of confidence in courtship, marriage, childbirth, and parenting of the echo boomers according to sociodemographic variables, psychosocial variables, workplace related variables were examined and multiple regression analysis was conducted in order to identify the factors that affect the confidence in courtship and marriage, childbirth and parenting. The results were as follows: The level of confidence in courtship and marriage, childbirth and parenting showed a statistically significant difference depending upon socioeconomic status and psychosocial variables. However, among the workplace related variables, other than childbirth and parenting within the job satisfaction category, all other variables showed a statistically significant difference. In addition, as the determining factors affecting all issues of courtship, marriage, childbirth, and parenting, youth perceptions of Korean society revealed to be the most influential factor, followed by social support and organizational commitment.

• Journal of Convergence for Information Technology
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• v.7 no.4
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• pp.45-51
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• 2017

The purpose of this study is to find the level of drug dose calculations and confidence of nursing students who completed fundamental nursing. After receiving informed consent, questionnaires and drug dose calculation paper of 152 subjects were collected. The data were analyzed using SPSS 19.0. The $mean{\pm}SD$ of drug dose calculations was $7.46{\pm}1.97$ on a scale of 10, the mean score of male students was higher than female's(t=3.64, p=.001), and the mean score of science was higher than vocational's according to high school departments(F=5.11, p=.007). In the score of confidence, the $mean{\pm}SD$ was $4.12{\pm}1.12$ on a scale of 6, the mean score of male students was higher than female's(t=8.94, p=.001), and the science was higher than humanity or vocational(F=6.28, p=.002). There was a positive correlation between drug dose calculation and confidence scores(r= .32, p=.001), and explanation rate of confidence on drug dose calculation was 10.2%(p=0.001) in regression analysis. This suggests that nursing students need to improve drug dose calculation ability by strengthening confidence.