• Communications of Mathematical Education
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• v.34 no.4
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• pp.545-561
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• 2020

The purpose of this study is to investigate the applications and possibilities of major programs that provide services using artificial intelligence in mathematics education. For this study, related papers, reports, and materials were collected and analyzed, focusing on materials mostly published within the last five years. The researcher searched the keywords of "artificial intelligence", "artificial intelligence", "AI" and "mathematics education" independently or in combination. As a result of the study, artificial intelligence for mathematics education was mostly supporting learners' personalized mathematics learning, defining it as an auxiliary role to support human mathematics teachers, and upgrading the technology of not only cognitive aspects but also affective aspects. As suggestions, the researcher argued that followings are necessary: Research for the establishment of an elaborate artificial intelligence mathematical system, discovery of artificial intelligence technology for appropriate use to support mathematics education, development of high quality of mathematics contents for artificial intelligence, and the establishment and operation of a cloud-based comprehensive system for mathematics education. The researcher proposed that continuous research to effectively help students study mathematics using artificial intelligence including students' emotional or empathetic abilities, and collaborative learning, which is only possible in offline environments. Also, the researcher suggested that more sophisticated materials should be developed for designing mathematics teaching and learning by using artificial intelligence.

• The Journal of the Convergence on Culture Technology
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• v.8 no.1
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• pp.537-544
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• 2022

As the penetration of electric vehicles and development of new models, user experience factors are getting more important in designing connectivity systems for car infotainment services. The primary object of this study is to identify commonalities and differences by comparing user experience factors in the Korean and US electric vehicle markets. This study derived connectivity keywords by text mining the vehicle introduction on the market in each country, and performed centrality, cluster analysis and visualization mapping using the semantic network analysis. As a result, the Korean new electric vehicle connectivity service mainly focused on driving functions such as driving, parking assistance, and charging, while US focused on device connection, convenience function control, app use, entertainment viewing. Based on the analysis, this study presented the practical implications in marketing, system design, and HMI design.

• Journal of Navigation and Port Research
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• v.47 no.6
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• pp.324-330
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• 2023

Aids to navigation, which provide information about a ship's position, direction, and the location of obstacles, are crucial for uninterrupted maritime services. This study aimed to analyze accidents involving aids to navigation that resulted in service disruptions and identify the key factors associated with these accidents. Aids to navigation accident data from 2000 to 2022 were utilized to achieve this. We categorized accidents by accident type, cause, region, season, and type of navigation aid and established a network through correlation analysis. Bayesian networks based on aids to navigation accidents were assigned prior probabilities, and the factors that increased the probability of accidents for different types of aids to navigation were identified. The findings can be used to infer the causes of unreported aids to navigation accidents and serve as foundational data for the prevention of such accidents.

• Journal of Hospice and Palliative Care
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• v.13 no.3
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• pp.153-160
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• 2010

Purpose: The purpose of the present study was to investigate needs and satisfaction on the medical services of cancer patients in Jeju Special Self-Governing Province. Methods: Total 174 cancer patients, who visited at the clinic of Jeju National University Hospital, submitted informed consent and participated in this study from July 13 to July 30, 2009. Self questionnaire was used and data were analyzed with Kolmogorov-Smirnov test, Mann-Whitney U test, ANOVA, and Kruskal-Wallis test. Results: Participants expressed the needs of most economical support (3.38 out of 4), followed by counseling of treatment plan (3.22), information of disease (3.07), and disease management except cancer (2.97). Participants were satisfied most with religious counseling (3.41), followed by nursing service support (3.39), employment counseling (3.26), and counseling for family or interpersonal relationships (3.26). The satisfaction of economical support was the lowest (1.98). Satisfaction of men was higher than women, and needs in patients who were living with children was the highest. Patients who were living alone or with children showed the lowest satisfaction about the medical services. There were no significant differences in the general characteristics, however, participants who were older than 60 years of age or had higher income showed lower needs and higher satisfaction. There were no significant differences in the medical characteristics, however, thyroid cancer patients and patients who were treated with radiation therapy or transarterial embolization showed low satisfaction. Conclusion: Cancer patients seemed to need more economical support, information of treatment or disease, and symptom management. Furthermore, there were various needs about the services, depending on family formation or economical support of patients. Therefore, it is certain that patients who were suffering from other cancers, except the 5 major cancers, needed more services. In conclusion, continuous and systemic policy to consider patient's characteristics and needs are needed in community as well as health care system.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.12 no.6
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• pp.919-930
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• 2001

This paper presents a wideband technique of impedance and axial-ratio bandwidth which uses the stacked planar array structure through optimum design of sub-polarization generating sections and parasitic patch. So, the effect of the dual-resonance characteristic can contribute to the bandwidth expansion of single fed planar array antenna using circular polarization which doesn\`t hire previous bandwidth expansion technique. The antenna can be used as a dual-band antenna by adjusting the resonance frequencies as well, and then the antenna is designed and fabricated in the frequency band of domestic satellite-TV service. This antenna has the performance of 9.7 % impedance bandwidth and 24 dBi of antenna gain. And it has also 2.8 % and 1.4 % of 3 dB Axial-ratio bandwidth at 11.4 GHz and 11.8 GHz respectively.

• Proceedings of the KIEE Conference
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• 2006.11a
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• pp.189-191
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• 2006

전력시장의 도입과 함께 그동안 전력사업자가 자체적으로 운용하였던 계통보조서비스를 이제는 각 발전사에게 할당하여 공급하는 체계가 됨에 따라 이에 대한 적절한 보상이 주요 이슈화 되고 있다. 헌재 주파수제어나 예비력확보 등은 보상되고 있지만 무효전력 조정에 대해서는 아직까지 아무런 보상책이 없어 무효전력의 공급을 기피할 가능성이 있다. 그동안 무효전력의 최적비용에 대해서는 최적조류계산이나 한계송전손실계수 산정 등에 의해 각 모선별로 산정하는 방법은 연구되고 있지만 각 발전기의 변동비 측면의 접관은 실재 적용 가능한 현실적인 방법임에도 이에 대한 연구가 적었다. 여기서는 무효전력의 변동비를 산정하기 위해 손실에 따른 부가적 에너지를 구하고, 무효전력 운용 유지보수 비용 및 수명 저하에 따른 비용요소를 고려한다. 이 연구방법의 특징으로는 발전기측의 자료를 사용하여 각 발전기의 무효전력 공급에 따른 변동비를 산정할 수 있어 무효전력 공급에 대한 각 발전기별 보상을 할 수 있는 방법이다.

• Journal of Labour Economics
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• v.37 no.1
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• pp.29-57
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• 2014

Using unemployment insurance and income-contingent loan (ICL) that conditions repayment by debtors upon their incomes this paper characterizes an efficient income support system for the unemployed, which maximizes their lifetime utilities by effectively enhancing inter-state and inter-temporal consumption-smoothing subject to incentive constraints on the part of the beneficiaries. This paper also emphasizes the generality of the argument for a mix of ICL and subsidy that may be applied potentially to many types of government welfare program.

• Proceedings of the Korean Association for Survey Research Conference
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• 2000.11a
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• pp.109-125
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• 2000

본 논문은 3개 기초자치단체 지역주민들을 중심으로 이들 지방정부의 투자우선지출 순위에 관한 지역주민의 의식을 분석해 보았다. 이러한 분석은 근본적으로 지방정부의 공공지출을 통한 투자사업 활동이 지역주민의 선호순위와 일치하는지를 검증해보기 위한 선행연구로서의 의미를 가지고 있다. 지역에 따른 행정기능별 우선지출 순위분석에서 볼 때 일반행정부문의 경우 세지역 모두 기획조정분야에 가장 큰 우선지출을 요구하고 있고 산업경제 부문의 경우 지역특산물생산과 지역공단육성에 큰 관심을 보이고 있으며 사회복지부문의 경우 쓰레기처리 및 폐기물관리 등에 우선적인 관심을 보여 생활환경의 정비에 큰 관심이 있는 것으로 분석되었다. 지역개발사업의 경우 도시계획 및 도시정비사업이 그리고 민방위부문의 경우 재난관리와 화재예방의 부문에 특히 우선지출의 관심을 보이고 있었다. 지방자치단체의 공공지출에 영향을 미치는 주요요인들은 주민참여도, 정부.기업관계, 정치적 연계, 기획과 예산구조, 공공투자 재원보조, 등으로 구성되어 있으나 각 요인별로 구성변인에 따른 지역주민간의 인식은 다르게 나타남을 알 수 있었다. 이상과 같은 지역주민들의 공공지출형태의 다양성과 여러 기대조건들을 충족시키고 그럼으로써 행정서비스에 대한 지역주민의 만족도를 극대화하기 위해서는 각 지방정부는 그들 지역내 특수한 사회 경제적 여건하에서 새로운 고객관리전략을 수립하여야 할 것이다.

• Journal of the Korea Society of Computer and Information
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• v.9 no.4 s.32
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• pp.71-76
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• 2004

In this paper, a web-based automatic transcription component is designed and implemented for mechanical conversion of revised Korean-to-Romanization notation rule. Specially. we proposes system architecture and algorithms that transcript Korean to Roman automatically after transliterate Korean to phonetic symbol applying phonological principles. The components operate under the web server's script mechanism. and the dictionary for exceptional usage is designed as an accessorial function supported either operating at web server internally or externally. The overall system architecture is presented by UML. specification and pseudo code. The proposed architecture can be implemented in encapsulated service by object oriented component and that can be easily adapted and modified on the internet environment and this system may have many advantages to improve efficiency, library reuse. extensibility at software development.

• The Journal of the Korea Contents Association
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• v.7 no.12
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• pp.273-282
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• 2007

The Domain Name System (DNS) is the core system for managing Internet address resources, providing the most fundamental naming service. Currently, the DNS is classified into a tree structure. In this structure, it is difficult to normally access to the lower DNS, when there is an error in the upper DNS. Such a risk still remains even when a supplementary DNS is operated. However, due to the merit of the DNS enabling fast searches, it is impracticable to abandon the current tree structure. To efficiently correspond to DNS errors, this study suggests a method where the merit of the current tree structure is kept, while a temporary operation of the local DNS is available when errors occur by adding a horizontal and independent DNS structure.