• Smart Structures and Systems
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• v.26 no.6
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• pp.693-701
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• 2020

The conventional Kalman Filter (KF) provides a promising way for structural state estimation. However, the physical parameters of structural systems or models should be available for the estimation. Moreover, it is not applicable when the loadings applied to the structures are unknown. To circumvent the aforementioned limitations, a two-stage KF with unknown input approach is proposed for the simultaneous identification of structural parameters and unknown loadings. In stage 1, a modified observation equation is employed. The structural state vector is estimated by KF on the basis of structural parameters identified at the previous time-step. Then, the unknown input is identified by Least Squares Estimation (LSE). In stage 2, based on the concept of sensitivity matrix, the structural parameters are updated at the current time-step by using the estimated structural states obtained from stage 1. The effectiveness of the proposed approach is numerically validated via a five-story shearing model under random and earthquake excitations. Shaking table tests on a five-story structure are also employed to demonstrate the performance of the proposed approach. It is demonstrated from numerical and experimental results that the proposed approach can be used for the identification of parameters of structure and the external force applied to it with acceptable accuracy.

• The Mathematical Education
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• v.48 no.4
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• pp.469-481
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• 2009

This study investigates the relationship of mathematics anxiety and achievement in college mathematics for engineering major freshman students. An revised and modified 30-item version of the Mathematics Anxiety Scale(MAS) was completed by 176 university engineering students enrolled in introductory calculus courses offered by the department of mathematics. Correlational analysis indicated complex interaction patterns between mathematics anxiety and mathematics achievement, depending on the level of anxiety. The results from this study confirm the negative correlation between mathematics anxiety and mathematics achievement in college mathematics for engineering major student, and also those support the claim that the relationships between mathematics anxiety and achievement have non-linear patterns.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.13 no.2
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• pp.543-547
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• 2012

The environmental education is more and more important according to increasing environmental problems, but university students don't receive it actively. Actually, environmental education in university is conducted and focused on environmental engineering. In order to have an effect on environmental education for all engineering college students, the course of environmental education consists of various fields of engineering study including environmental engineering. The environmental education categories for engineering college students are determined by using an AHP technique in this study. After educating engineering college students with the developed environmental education course, we evaluated the environmental education performance using the survey on perception level and purchasing data of environmentally consciously products by statistical and RFM analysis.

• Journal of Microbiology and Biotechnology
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• v.24 no.7
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• pp.987-997
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• 2014

The mature landfill leachate, which is characterized by a high concentration of ammonia nitrogen ($NH_3$-N) and humic acid (HA), poses a challenge to biotreatment methods, due to the constituent toxicity and low biodegradable fraction of the organics. In this study, we applied bioaugmentation technology in landfill leachate degradation by introducing a domesticated $NH_3$-N and HA resistant bacteria strain, which was identified as Bacillus cereus (abbreviated as B. cereus Jlu) and Enterococcus casseliflavus (abbreviated as E. casseliflavus Jlu), respectively. The isolated strains exhibited excellent tolerant ability for $NH_3$-N and HA and they could also greatly improved the COD (chemical oxygen demand), $NH_3$-N and HA removal rate, and efficiency of bioaugmentation degradation of landfill leachate. Only 3 days was required for the domesticated bacteria to remove about 70.0% COD, compared with 9 days' degradation for the undomesticated (autochthonous) bacteria to obtain a similar removal rate. An orthogonal array was then used to further improve the COD and $NH_3$-N removal rate. Under the optimum condition, the COD removal rate in leachate by using E. casseliflavus Jlu and B. cereus Jlu increased to 86.0% and 90.0%, respectively after, 2 days of degradation. The simultaneous removal of $NH_3$-N and HA with more than 50% and 40% removal rate in leachate by employing the sole screened strain was first observed.

• Journal of Engineering Education Research
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• v.23 no.6
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• pp.51-59
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• 2020

ABEEK's professional liberal arts education reflecting critical thinking, has been well received by professors and students in the engineering discipline. Also, the demand for further utilization of critical thinking within the engineering curriculum is increasing. To meet such demand, there is a need for experts in the area of critical thinking education and engineering education to come together and search for the most effective method in using critical thinking in engineering design education courses. In this paper, we were able to confirm, through specific application cases, that the problem-solving process of critical thinking can be effectively transferred to an engineering design process, and the elements and criteria of critical thinking can be used as a successful design tool. Also, we explore the possibility of further improving engineering education on the basis of critical thinking.

• Journal of Engineering Education Research
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• v.13 no.6
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• pp.57-71
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• 2010

This paper is a study on the perception of current competency and expected competency of engineering freshmen by extracting core competencies acquired from university education. It also aims to suggest proper way for engineering university education. This study extracts competencies in the following five areas as core competencies: 'knowledge on major area', 'cultural ability', 'foreign language ability', 'basic learning ability', 'intercommunication ability'. To achieve this purpose, this study surveyed 'C' university engineering department freshmen (584 students) with questionnaires about their perception of core competencies. The results are as follows. First, engineering freshmen perceived current competencies were weak in every area, especially their capacities in 'foreign language ability' area were perceived to be weakest. Their demand for education is the highest in 'foreign language ability' area, and the second higher in 'knowledge on major area'. Secondly, there exists meaningful difference between perception of current competency and expected competency depending on the gender, high school department (science/liberal arts), high school location, types of college admissions, and types of mathematics in NAST. According to these results, this study suggests enhancement of foreign language (English) education in engineering department, design and implementation of various educational program to overcome individual difference, promoting importance of competencies in the 'cultural abilty' and 'intercommunication abilty', necessity of continuous adjustment and complementation for engineering educational program through accumulation of feedback processes, activation of career education through engineering education and special programs.

• Journal of the Korea Society of Computer and Information
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• v.23 no.5
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• pp.15-23
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• 2018

Recently, convergence engineering is emerged technology to make a whole new conceptual methodology attractively more than we previously developed the distinct technology for engineering college students particularly. Based on convergence methodology, we utilize the open-source electronic prototyping platform named Arduino enabling users to create interactive electronic objects and the automata that is generally referred to a wooden moving, mechanical device or art of work in order to develop the creative convergence education program. We have confidence that our education program can lead the development of automata and information technology simultaneously and can nurture talented students who have creativity and originality in engineering college.

• Journal of environmental and Sanitary engineering
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• v.21 no.2 s.60
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• pp.69-83
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• 2006

This research aims to improve the environmental education for elementary student's education program. That let environmental education be connected to other curriculum with a compunction enhancement plan to the internal volume side of environmental education, and grope for activation of compunction environmental education with curriculum necessary paradigm conversion of education for continuance possibility in green education. In case of legal and system, improving of legal and system by establishment of the environmental education act for system repair and source of revenue preparation of environmental education is needed. Based on importance of teaching-education and evaluation, it must be developed various teaching-education ways of environmental education in case of curriculum and an improvement of teaching-education ways and evaluation must be performed. After teaching-education about environmental education has been executed, a teaching-education improvement must be performed by evaluation.

• Journal of Engineering Education Research
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• v.4 no.1
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• pp.48-56
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• 2001

An engineering educational survey for graduating seniors had been conducted in Myong Ji university to improve engineering program objectives, outcomes and curriculums. The collected data have been analyzed statistically based on 11 outcomes of the ABEEK accredited criteria to know how much students are satisfied with the current engineering education. The analysis results show that the current engineering educational objectives need to be modified to satisfy the ABEEK accredited criteria and engineering curriculum restructuring is necessary to include more design courses.

• Journal of Engineering Education Research
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• v.15 no.6
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• pp.86-91
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• 2012

This paper has been studied to evaluate the program educational objectives (PEO) for mechanical engineering program at Chosun University. The program educational objectives were set up the educational goals with relationof college educational objectives and ability or quality of engineers after 3 years of graduation, and educated the basic competance of engineers are the equipments of high-level education enviroments, faculty and curriculum for effective engineering educations. This paper were to announce PEO to current students, to establish and to improve PEO throughout accesment and analysis of PEO evaluation. The improvement and documentation of PEO accesement system, collecton and analysis of PEO were conducted industial surveys for engineers graduated this program. The results are served as a substantial basis for setting furture educational goals, renewed PEO by the closed loop and making decision for quality of engineering education in the college of engineering. This study would be comfined measurements, analysis and achievements of PEO for graduated engineers in this program.