• Journal of the Korea Concrete Institute
• /
• v.14 no.6
• /
• pp.1022-1031
• /
• 2002

This paper presents efficient models for bridge structures using CART-ANFIS (classification and regression tree-adaptive neuro fuzzy inference system). A fuzzy decision tree partitions the input space of a data set into mutually exclusive regions, each region is assigned a label, a value, or an action to characterize its data points. Fuzzy decision trees used for classification problems are often called fuzzy classification trees, and each terminal node contains a label that indicates the predicted class of a given feature vector. In the same vein, decision trees used for regression problems are often called fuzzy regression trees, and the terminal node labels may be constants or equations that specify the predicted output value of a given input vector. Note that CART can select relevant inputs and do tree partitioning of the input space, while ANFIS refines the regression and makes it continuous and smooth everywhere. Thus it can be seen that CART and ANFIS are complementary and their combination constitutes a solid approach to fuzzy modeling.

• Proceedings of the Korea Water Resources Association Conference
• /
• 2010.05a
• /
• pp.202-212
• /
• 2010

하천복원설계 절차에 따라 현상태의 유역통합관리 대안 적용 전후에 대한 수리학적 특성을 저수량과 평수량에 대해 HEC-RAS 모형과 RMA2 모형을 이용하여 분석하였으며, 기본적인 수리모형의 계산결과를 바탕으로 목감천 하천설계 구간 4.5 km에 대해 하천의 수리 수문학적 분석을 수행하였다. 그리고 목감천에서의 지배유량을 산정하여 Rosgen의 하천분류법에 의해 하천형태를 분류한 후 경험식에 의한 하천복원설계를 수행하였다. 즉, 하천형태의 분류에 따라 하도 평면형 결정 및 하상경사 예측, 경험식에 의한 하도 단면 및 하상경사의 결정, 사행파장에 의한 여울의 위치를 각각 결정하였다. 목감천 하천복원 설계를 위한 구체적인 상세설계안을 마련하기 위하여 하천복원설계에 필요한 하도 평면형, 하도 종단형, 하도 단면형을 결정하였으며, 상세 설계의 기초자료로 활용한다.

• Journal of the Computational Structural Engineering Institute of Korea
• /
• v.17 no.2
• /
• pp.131-140
• /
• 2004

It really needs fuzzy decision making of integrity assessment considering about both durability and load carrying capacity for maintenance and administration, such as repairing and reinforcing. This thesis shows efficient models about reinforced concrete structure using CART-ANFIS. It compares and analyzes decision trees parts of expert system, using the theory of fuzzy, and applying damage & diagnosis at reinforced concrete structure and decision trees of integrity assessment using established artificial neural. Decided the theory of reinforcement design for recovery of durability at damaged concrete ＆ the theory of reinforcement design for increasing load carrying capacity keep stability of damage and detection. It is more efficient maintenance and administration at reinforced concrete for using integrity assessment model of this study and can carry out predicting cost of life cycle.

• Journal of the Korea Institute of Information and Communication Engineering
• /
• v.5 no.7
• /
• pp.1245-1249
• /
• 2001

In this paper I describe an Effective method by which analyzes the Fault-Tree, with Shannon decomposition. The advantage of this method are: 1) All the minimal outsets can not be preprocessed. 2) The maximum error can be prespecified. 3) s-dependent system also can be analyzed. But disadvantage is that certain subtrees of the decomposition tree can not be determined easily.

• Journal of the Korean Data and Information Science Society
• /
• v.24 no.6
• /
• pp.1285-1296
• /
• 2013

The fundamental concerns of this paper are to analyze the effects of student course evaluation using subject characteristic and student characteristic variables. We use a 2-level hierarchical linear model since the data structure of subject characteristic and student characteristic variables is multilevel. Four models we consider are as follows; (1) null model, (2) random coefficient model, (3) mean as outcomes model, (4) intercepts and slopes as outcomes model. The results of the analysis were given as follows. First, the result of null model was that subject characteristics effects on course evaluation had much larger than student characteristics. Second, the result of conditional model specifying subject and student level predictors revealed that class size, grade, tenure, mean GPA of the class, native class for level-1, and sex, department category, admission method, mean GPA of the student for level-2 had statistically significant effects on course evaluation. The explained variance was 13% in subject level, 13% in student level.

• Journal of Korean Dental Hygiene Science
• /
• v.6 no.2
• /
• pp.91-100
• /
• 2023

Background: This study evaluated the learning outcomes of dental hygiene students' ethical consciousness and ethical decision-making competence through dental ethics courses conducted in some universities. Methods: The subjects were 35 and 29 fourth-year dental hygiene students at G University in the first semester of 2021 and 2022, respectively, and 53 and 43 third-year dental hygiene students at D University, respectively, for a total of 160 students. After implementing the dental hygiene ethics course, classroom performance was evaluated in terms of moral sensitivity, confidence in making ethical decisions, classroom practicality, learning outcomes, and class satisfaction. Statistical analysis was conducted using independent t-test and paired t-test, and the statistical significance level was 0.05. Results: Both universities reported an increase in moral sensitivity and confidence in ethical decision-making after the course (p<0.001). Classroom practicality and class satisfaction for the dental hygiene ethics course did not differ between disciplines and were rated positively with a score of 4 or higher (p>0.05). Learning outcomes were higher among 4-year students than 3-year students (p<0.001). Conclusions: It was evaluated that the ethics in dental hygiene curriculum can strengthen students' competence in ethical decision-making, including moral sensitivity and confidence in solving ethical problems in dental hygiene.

• Journal of Convergence for Information Technology
• /
• v.10 no.10
• /
• pp.174-182
• /
• 2020

The purpose of this study was to verify the educational effects of career guidance classes, which are now included in regular course offerings by universities. To this end, the self-efficacy of college students regarding career decisions and their degree of career maturity was measured as effect variables. The subjects of the study included 33 sophomores who took 15 weeks of career guidance classes provided by four-year universities. Pretest-posttest design and the paired t-test were conducted for verifying the differences before and after taking career guidance courses. According to the results of the analysis, first, university students' self-efficacy in career decision-making was higher after taking the career guidance courses, indicating a statistically significant difference. Second, the t-value for the difference before and after taking the career guidance courses was indicating that there was a slight statistically significant improvement. These results are meaningful in that they proved that career guidance courses in higher education had the educational effects of improving self-efficacy in career path decisions and the career maturity of college students.

• Proceedings of the Korean Fiber Society Conference
• /
• 1992.06b
• /
• pp.81-82
• /
• 1992

• Polymer Science and Technology
• /
• v.20 no.6
• /
• pp.552-557
• /
• 2009

• Korean journal of applied entomology
• /
• v.32 no.4
• /
• pp.426-432
• /
• 1993

Thirteen isolates of Bacillus thunngiensls producing parasporal mclusions, obtained from 45 samples of dust and soil of sericultural tarms in Kyeong-ki province, were exammed for their toxicity against larvae of Lepidoptera, Dipwra and Coleoptera. Of these isolates, Bacillus f thuringiensis NT0423 was toxic to bath Lepidoptera, and Dipteran larvae. NT0423 showed that the $LC_{50}$ values against the Lepldaptora, Plutella macuhpennis and the Diptera, Culex pipiens were $1.30\times10^6$ CFU/ml, $2.88\times10^5$ CFU/ml, respectively. The tYPlcal bipyramldal crystals produced by NT0423 composed of protoxms of 130-140kDa encoded by one or more plasm mid-horne genes. Also, plasmid DNA analysis indicated Lhat this isolate has 9 plasmids which d differ with reported several B. thuringiensis strains.