• Journal of the Korean School Mathematics Society
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• v.7 no.1
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• pp.49-69
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• 2004

The purpose of this study was to develop learning materials for the remedial curriculum, part of the 7th sequential differentiated math curricula, in an effort to fix the academic deficiencies of underachieving students, provide motivation to them and enhance their self-directed learning capabilities. The subjects in this study were the students in their second year of C middle school, who were in want of remedial education. After their mid-term and finals grades in the first semester of 2003 were analyzed to measure their academic deficiencies, remedial learning materials about math 8-A stage were developed, by modifying the textbook and existing materials, in consideration of 7-A stage. After they were utilized in remedial class, frequency analysis was conducted to find out what the students thought of the developed learning materials, and diagnosis evaluation was implemented to find out how many students passed the test, improve the materials, and suggest in which way their achievement could get better.

• Journal of the military operations research society of Korea
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• v.35 no.2
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• pp.15-31
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• 2009

This paper examines several inefficient problems generated from a management process of defense acquisition system, and suggests several alternatives to remedy the current acquisition-related problems. This might help MND to reform the current DAPA's acquisition system. The offered elements are to, first, redefine function of mid-term plan & budget allocation between MND and DAPA, second, devise economic acquisition management and force development to build integrated management system of requirement-acquisition-operation & maintenance, third, build Workforce Management Act(WMA) and Professional Education System(PES) for strengthening expertise and institutionalizing manpower rotation of requirements & acquisition-related fields, fourth, implement weapon systems' Total Life Cycle Systems Management(TLCSM) and improve developmental & operational test and evaluation. These are essential elements in minimizing confusion & conflict emanating from surrounding acquisition program among MND-DAPA-Each Services.

• Journal of Korean Foot and Ankle Society
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• v.18 no.4
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• pp.195-201
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• 2014

Purpose: The purpose of this study is to develop guidelines for clinical trial of the total ankle replacement system for premarket approval. Materials and Methods: We selected and analyzed nine peer-reviewed articles whose quality had been proven in a previous phase. Two investigators extracted parameters for guideline criteria, including number of cases, patient age, follow-up period, failure rate, radiographic osteolysis rate, residual pain rate, and percentage of satisfaction. In addition, the inclusion and exclusion criteria were analyzed and developed. Results: Eight level IV studies and one level II study were included. The average number of cases was 159 cases and the mean patient age was 63.5 years. The mean follow-up period was 4.2 years, ranging from two to nine. The average failure rate of total ankle replacement in mid- to long-term follow-up was approximately 13% (2%~32.3%). The rate of osteolysis was approximately 18%. Residual pain was common (21.4%~46%), but overall patient satisfaction was approximately 85.6% (67.5%~97%). Conclusion: The results could be used as criteria for designing the clinical studies, such as number of cases, patient age (over 60 years), and follow-up period (minimum two years). The clinical scoring system and 36-item short form health survey (SF-36) was the most commonly used method for clinical evaluation for total ankle arthroplasty. In addition, the overall results, including failure rate, osteolysis rate, and patient satisfaction, could be used as a parameter of guidelines for premarket approval.

• Journal of Radiation Industry
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• v.8 no.2
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• pp.123-132
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• 2014

After the nuclear accident of the Fukushima Dai-ichi Nuclear Power Plants (FDNPPs) on 11 March 2011, a large amount of radioactive materials has been released into the atmosphere and the ocean. A compartment model is used to evaluate the circulation characteristics and the spatiotemporal concentration distributions of radionuclides in the ocean. In the comparison with observed concentrations of $^{137}Cs$ in seawater, calculated concentrations by the compartment model were well agreed with them. On the basis of these results, we performed evaluation of the effective dose and the cancer risk. In the early stage of the accident, the effective doses from ingestion of the seafood near the Fukushima region were much higher than 1 mSv which is the value of the annual effective dose limit to individual recommended by the International Commission on Radiological Protection (ICRP). However, the effective doses by ingestion of the seafood decreased below 1 mSv as distance from the FDNPPs increased and time passed. In addition, it was estimated that the cancer risks by intake of the contaminated marine products were less than natural occurrence probability of cancer. Consequently, it was inferred that the health risk due to the $^{137}Cs$ was low after since mid-term period of the accident.

• Journal of Digital Convergence
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• v.19 no.1
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• pp.1-10
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• 2021

The purpose of the study is to investigate the impact and analyze the effect of smart learning based class to on the students with low academic achievement level. The study performed in G University in 2018 among students taking calculus II class. It includes 16 students with low academic achievement level, whose grades were under C in the previous calculus I class. They belonged to special class consisted of very low academic achievement level and had to pass calculus II. 3D and AR were actively used in the class. The result shows that they got visual understanding of space, which revealed through analyzing SNS, mid-term and final examination, lecture evaluation. Also, smart learning based mathematics class utilizing smartphone's application elevated academic achievement level and influenced positively on the interest and attitude toward mathematics regardless of previous academic achievement level.

• Imaging Science in Dentistry
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• v.53 no.1
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• pp.1-9
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• 2023

Purpose: The aim of this study was to evaluate 3-dimensional cone-beam computed tomography (CBCT) images of alveolar bone changes in patients who underwent minimally invasive periodontal surgery-namely, the pinhole surgical technique (PST). Materials and Methods: Alveolar bone height was measured and compared on CBCT images of 254 teeth from 23 consecutive patients with Miller class I, II, or III recession who had undergone PST. No patient with active periodontal disease was selected for surgery. Two different methods were used to assess the alveolar bone changes postoperatively. In both methods, the distance between the apex of the tooth and the mid-buccal alveolar crestal bone on pre- and post-surgical CBCT studies was measured. Results: An average alveolar bone gain >0.5 mm following PST was identified using CBCT(P=0.05). None of the demographic variables, including sex, age, and time since surgery, had any significant effect on bone gain during follow-up, which ranged from 8 months to 3 years. Conclusion: PST appears to be a promising treatment modality for recession that results in stable clinical outcomes and may lead to some level of resolution on the bone level. More long-term studies must be done to evaluate the impact of this novel technique on bone remodeling and to assess sustained bone levels within a larger study population.

• Proceedings of the Korean Institute of Building Construction Conference
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• 2021.05a
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• pp.93-94
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• 2021

The Korean government has invested a tremendous amount of money in the last 10 years to build large public research infrastructures (LPRI). For efficient operation and maintenance of LPRI built with expensive equipment and professional engineers, reasonable budget needs to be allocated. However, it is difficult to fulfill sustainable operation and maintenance (O&M) because there is no standard on budgeting for efficient LPRI operation, including expensive equipment and manpower allocation. There have been a lot of cost assessment studies regarding O&M of high-demand facilities such as hospitals, hotels and residential buildings, but a very few on sustainable O&M of LPRI. Therefore, mid/long-term budget establishment plans for efficient LPRI O&M are required from the initial planning stage and a cost assessment model to support the plans should be developed. The objective of this paper is to propose a cost assessment model for sustainable operation and maintenance of large public research infrastructures. To do so, actual O&M data of 6 LPRI types in operation are collected, and regression analysis model (RAM) is used for development and evaluation a cost assessment model. The study result will support sustainable operation of LPRI from a business perspective and be used as basic data for continuous development of cost assessment models to establish budgets for LPRI operation from an academic perspective.

• Journal of the Korea Fashion and Costume Design Association
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• v.25 no.2
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• pp.45-59
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• 2023

This study aims to find implications for the introduction and practice of ESG by domestic fashion companies by examining the core ESG topics and strategies of Samsung C&T Fashion Division, Kolon FnC, F&F holdings, and Fila. ESG management analysis examined the importance of the criticality evaluation process, critical issues, and implementation strategies for each key topic based on the company's 2021 ESG sustainable management report, and analyzed the relationship with UN SDGs and the GRI. The analysis results are as follows: As for KCGS' ESG rating, Samsung C&T's fashion division, Kolon FnC, and Fila Holdings were rated A, while F&F Holdings was rated B+. The major issues derived from ESG's criticality assessment are environmental issues related to Samsung C&T's fashion division. Kolon FnC was found to have focused on the social sector and F&F Holdings focused on governance structure. After examining the correlation between the ESG core strategies of the investigated fashion companies and the 17 SDGs, the common areas were identified as quality employment, sustainable production and consumption, and climate changes and response. Correlation with the GRI Standards 2021 Index, (GRI 1, GRI 11, and GRI 12 created in 2021) was not reflected. In the future, it will be necessary to have a transparent governance structure that meets global standards, sets measurable goals, and continuously manages them. Other companies should also recognize ESG management processes that embrace various stakeholders and strengthens win-win cooperation to manage risks, and establish mid- to long-term response strategies.

• Journal of Korean Society of Water and Wastewater
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• v.37 no.6
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• pp.363-373
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• 2023

Numerous studies have established a correlation between sociodemographic characteristics and water usage, identifying population as a primary independent variable in mid- to long-term demand forecasting. Recent dramatic sociodemographic changes, including urban concentration-rural depopulation, low birth rates-aging population, and the rise in single-person households, are expected to impact water demand and supply patterns. This underscores the necessity for operational and managerial changes in existing water supply systems. While sociodemographic characteristics are regularly surveyed, the conducted surveys use aggregate units that do not align with the actual system. Consequently, many water demand forecasts have been conducted at the administrative district level without adequately considering the water supply system. This study presents an upward water demand forecasting model that accurately reflects real water facilities and consumers. The model comprises three key steps. Firstly, Statistics Korea's SGIS (Statistical Geological Information System) data was reorganized at the DMA level. Secondly, DMAs were classified using the SOM (Self-Organizing Map) algorithm to consider differences in water facilities and consumer characteristics. Lastly, water demand forecasting employed the PCR (Principal Component Regression) method to address multicollinearity and overfitting issues. The performance evaluation of this model was conducted for DMAs classified as rural areas due to the insufficient number of DMAs. The estimation results indicate that the correlation coefficients exceeded 0.9, and the MAPE remained within approximately 10% for the test dataset. This method is expected to be useful for reorganization plans, such as the expansion and contraction of existing facilities.

• The Journal of the Convergence on Culture Technology
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• v.11 no.1
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• pp.389-399
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• 2025

This study explores twigak(fried seaweed crisps) made from kelp (Dasima) from the Goryeo Dynasty to the modern era. Kelp, a major local product of the Hamgyeong Province, was closely linked to the region's dietary culture. Over time, kelp evolved into various dishes, including twigak, bugak, and maedeup-jaban. The term twigakbegan to be used in the mid-19th century, reflecting the identity of the Korean language. Kelp bugak, made by coating kelp with glutinous rice paste and frying it, became a visually appealing winter dish, while maedeup-jabandeveloped into a year-round delicacy. Even today, kelp-based dishes remain significant in Korean cuisine, balancing health and flavor. This underscores the sustainable nature of traditional Korean food. In conclusion, the study reexamines the value and significance of kelp in Korean cuisine and highlights the need for future research into the nutritional value and culinary diversity of kelp and other seaweeds. Such research is expected to contribute to a deeper understanding of the evolution and innovation of kelp-based dishes.