• Journal of the Korean Geographical Society
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• v.48 no.3
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• pp.336-347
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• 2013

This paper presents an evaluation of stream restoration projects in Seoul with a focus on dissolved oxygen. Five test sites across four streams were measured for dissolved oxygen (DO) in late May to early June in 2012 and compared against a set of minimum and maximum thresholds. Only one test site, Hwarang-cheon, showed measurements below 6 mg/l DO. Towards the upper limit, the Hwarangcheon site was the only tested stream which was not at risk of DO supersaturation. The Danghyeon-cheon site had the highest probability of supersaturation, with DO saturation exceeding 130% expected 86.5% of the time. When measured every hour during daytime, DO levels showed diurnal variations, peaking in the afternoon. However, they showed inconsistent results along transects of the streams. Overall, the streams are rich in DO. To maintain the streams in good standing, nutrient loading should be addressed to prevent potential algal bloom induced hypoxic events down the line.

• International conference on construction engineering and project management
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• 2017.10a
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• pp.235-241
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• 2017

SWOT-AHP method was utilized in the research for the Korean construction companies to advance into the US PPP market. The research was that the SO Strategy ": Advancing through strategic selection of both construction sector type and region", ST Strategy "Advancing based on the acquired competitive business sector", WO Strategy "Developing collaboration model between public financial organization and construction company", and WT Strategy "Establihing a partnership or M&A with local companies".

• Journal of Korean Elementary Science Education
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• v.38 no.2
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• pp.203-215
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• 2019

The purpose of this study is to clarify the roles of laboratory work in school. Twenty-one literatures were identified about roles of laboratory work in school by applying criteria such as published in CI level journals or used as a reference over 100 times during 1960-2017. Twenty-one literatures were reviewed according to periods such as 1960-1989, 1990-2003, and 2004-2017, and identified the roles of laboratory work in school that commonly presented in more than two literature. Seven roles of laboratory work in school identified were as follows (a) learning scientific knowledge, (b) enhancing attitude toward science, (c) learning scientific inquiry methods, (d) acquiring skills to use specific laboratory instruments, (e) enhancing scientific attitude, (f) understanding the nature of science(NOS), and (g) providing opportunity to experience natural or scientific phenomena. The results of this study can be used to provide school teachers and students a clear meaning of the roles of laboratory work in school.

• Korean Journal of Construction Engineering and Management
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• v.17 no.2
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• pp.80-89
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• 2016

Recently, the paradigm shift of new construction into efficient operation and maintenance of infrastructure is seen. Also, concerns about infrastructure safety, especially the aged infrastructure, are on the increase. This study evaluates the current status of infrastructure safety and maintenance using data from 1994 to 2014 in Facility Management System operated by Korea Infrastructure Safety Corporation. Also, a quantitative analysis of safety performance of infrastructure is conducted to find out the enhancement of infrastructure safety in Korea. It was found that safety of facilities in Korea have been enhanced for the past decades. Improvement of safety performance of facilities is attributed to periodic safety inspection and repair and reinforcement. The result of the study can be used as a basic material for efficient and effective facility maintenance policies and strategies.

• Hwankyungkyoyuk
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• v.20 no.1
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• pp.28-41
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• 2007

Current environmental education at elementary school is demanded to be changed into 'Sustainable Development', Therefore, we should find a new program to reflect appropriateness and diversity of environmental education at elementary school for 'Sustainable Development'. The result of analysing textbooks and the realities in environmental education at elementary school is as follows, First, when we analysed the contents of the textbook in environmental education, the reflecting rate was high in 'natural environment' and 'sound consumption', compared with in 'artificial environment', 'resource and energy' and 'health and environment'. Second, we realized the necessity for 'environmental education' complementary to 'Sustainable Development'. That is because the analysis showed the lack for the activity for approaching and solving environmental problems with 'artificial environment', 'resource and energy' and 'health and environment'. Third, the analysis also showed the deficiency in the reflection of 'environmental education' contents for maintaining healthful environment through improving the quality of life. Current textbook didn't deal with very important elements of 'environmental education' - the Quality of indoor atmosphere, harmful matter, safe things to eat, noise, stench, etc. For those reasons, it is necessary to reconstruct the realm and the contents of 'environmental education' for 'Sustainable Development' appropriate to elementary school. We require a new curriculum and textbook to cover diverse' environmental education' as well.

• Journal of The Korean Association of Information Education
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• v.25 no.5
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• pp.779-790
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• 2021

This study analyzed the effect of AI maker coding education on improving students' computational thinking. The subjects of the study were 10 students at H Elementary School in Ansan, and a total of 8 AI maker coding education using the Instructional Model for Maker Education based on SW Coding was applied to students to find out the degree of improvement of computational thinking. Students who participated in the class performed a process of solving real-life problems through coding and making activities, measured the degree of improvement in computing thinking before and after education through a computing thinking test paper, and observed students' thinking processes related to computing thinking components through interviews. As a result, it was confirmed that the average score of all students' computational thinking skills was improved, and the deviation of scores between students decreased. Through the interview, it was found that students actively utilize their thinking skills related to computational thinking skills in the problem-solving process. Through this, it was confirmed that AI maker coding education can have a positive effect on improving students' computing thinking skills.

• Korean Journal of Construction Engineering and Management
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• v.22 no.5
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• pp.66-72
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• 2021

Participation in official development assistance (ODA) construction projects can be proposed as a way to revitalize Korean small and medium-sized construction companies' entry into the overseas construction market. To this end, the necessary competency items were derived for the execution of the project, and a survey was conducted and an analysis of importance-current competency was performed. 24 out of a total of 32 competency items were analyzed as having a low level of competency compared to their importance, indicating that it is urgent to strengthen corporate-level capabilities for the smooth execution of related projects in the future. In detail, it is judged that it is necessary to seek to establish a preferential capacity-strengthening plan for contract management-related items such as the 'Construction-related fundamental laws, Contract management method, and International administration negotiation'.

• Korean Journal of Construction Engineering and Management
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• v.23 no.2
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• pp.76-84
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• 2022

Recently, as the frequency of natural disasters has increased, causing enormous human and material damage, the importance of managing disasters is emphasized. In particular, as the concept of Build Back Better becomes meaningful, it has appeared that considering it during Post-disaster Reconstruction is a necessity. Therefore, in this study, the relative importance evaluation and correlation analysis were performed for each influencing factor through the derivation of the influencing factors that should be considered during the reconstruction approach stage of reconstruction after disasters, and a survey of overseas disaster-related experts. As a result of the analysis, 'Adaptability to the environment changes in the future was derived as the most significant influencing factor. It seems that the results of this study can be used as basic data when carrying out the reconstruction project.

• Journal of Biomedical Engineering Research
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• v.44 no.1
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• pp.85-91
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• 2023

Stress urinary incontinence (SUI) occurs when abdominal pressure increases, such as sneezing, exercising, and laughing. Surgical and non-surgical treatments are the common methods of SUI treatment; however, the conventional treatments still require continuous and invasive treatment. Laser have been used to treat SUI, but excessive temperature increase often causes thermal burn on urethra tissue. Therefore, the optimal conditions must be considered to minimize the thermal damage for the laser treatment. The current study investigated the feasibility of the laser irradiation condition for SUI treatment using non-ablative 980 nm laser from a safety perspective through numerical simulations. COMSOL Multiphysics was used to analyze the numerical simulation model. The Pennes bioheat equation with the Beer's law was used to confirm spatio-temporal temperature distributions, and Arrhenius equation defined the thermal damage caused by the laser-induced heat. Ex vivo porcine urethral tissue was tested to validate the extent of both temperature distribution and thermal damage. The temperature distribution was symmetrical and uniformly observed in the urethra tissue. A muscle layer had a higher temperature (28.3 ℃) than mucosal (23.4 ℃) and submucosal layers (25.5 ℃). MT staining revealed no heat-induced collagen and muscle damage. Both control and treated groups showed the equivalent thickness and area of the urethral mucosal layer. Therefore, the proposed numerical simulation can predict the appropriate irradiation condition (20 W for 15 s) for the SUI treatment with minimal temperature-induced tissue.

• 한국정보교육학회:학술대회논문집
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• 2021.08a
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• pp.77-84
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• 2021

The purpose of this study is to propose AI maker coding education as a way to improve computational thinking(CT), which is an essential competence for problem-solving capability in modern society, and to analyze the effectiveness of this education on improving CT in elementary school students. For the research, 5 students from 4th graders and 5 students from 6th graders were recruited, and AI maker coding education was planned in 8 sessions to form classes from basic block coding and maker education to real-life problem solving. To analyze the effectiveness of AI maker coding education, pre- and post-CT examinations were performed. The test results confirmed that AI maker coding education had a significant effect on "abstraction", "algorithm", and "data processing" in the five CT components, and confirmed that there was no correlation in "problem resolution" and "automation". Overall, the average score of all students increased, and the deviation between students decreased, confirming that AI maker coding education was effective in improving CT.