• Restorative Dentistry and Endodontics
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• 제44권4호
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• pp.38.1-38.8
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• 2019

Navigation of the main root canal and dealing with a dens invaginatus (DI) is a challenging task in clinical practice. Recently, the guided endodontics technique has become an alternative method for accessing root canals, surgical cavities, and calcified root canals without causing iatrogenic damage to tissue. In this case report, the use of the guided endodontics technique for two maxillary lateral incisors with multiple DIs is described. A 16-year-old female patient was referred with the chief complaint of pain and discoloured upper front teeth. Based on clinical and radiographic findings, a diagnosis of pulp necrosis and chronic periapical abscess associated with double DI (Oehler's type II) was established for the upper left lateral maxillary incisor (tooth #22). Root canal treatment and the sealing of double DI with mineral trioxide aggregate was planned for tooth #22. For tooth #12 (Oehler's type II), preventive sealing of the DI was planned. Minimally invasive access to the double DI and the main root canal of tooth #22, and to the DI of tooth #12, was achieved using the guided endodontics technique. This technique can be a valuable tool because it reduces chair-time and, more importantly, the risk of iatrogenic damage to the tooth structure.

• 디지털융복합연구
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• 제10권6호
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• pp.159-169
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• 2012

본 연구는 컨설팅서비스 참여주체인 CEO, 프로젝트매니저, 전문컨설턴트, 부서별 부서장들의 역할과 컨설팅성과간의 관계에 있어 사후관리(Post Management)의 조절효과를 분석하였다. 분석결과, 컨설팅서비스 각 주체와 컨설팅 성과와의 관계에 있어 목표달성을 위한 지속적인 점검 및 관리활동은 궁극적인 컨설팅성과에 유의미한 영향을 미쳐, 사후관리의 조절효과를 확인할 수 있었다. 본 연구에서는 비즈니스 참여주체별 지속적인 사후관리의 조절효과로 실증 분석함으로서 단기과업으로 인식되었던 컨설팅서비스를 지속가능경영의 실천을 위해 수반되어야 할 지식경영서비스의 중요한 일부분으로서의 역할을 확인하였다는데 그 의의가 있다.

• International Journal of Advanced Culture Technology
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• 제8권1호
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• pp.165-172
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• 2020

Industrial Revolution means the improvement of productivity through technological innovation and has been a driving force of the whole change of economic system and social structure as the characteristic of technology as the tool of this productivity has changed. Since the first industrial revolution of the 18th century, productivity efficiency has been advanced through three industrial revolutions so far, and this fourth industrial revolution is expected to bring about another revolution of production. In this study, the demand for the introduction of artificial intelligence(AI) technology has been increasing in various business fields due to the rapid development of ICT technology, and the classification of HS(harmonized commodity description and coding system) items has been decided using artificial intelligence technology, which is the core of the fourth industrial revolution. And it is enough to construct HS classification system based on AI technology using inference and deep learning. Performing the HS item classification is not an easy task. Implementation of item classification system using artificial intelligence technology to analyze information of HS item classification which is performed manually by the current person more accurately and without any mistake, And the customs administrations, customs offices, and customs agencies, it is expected to be highly utilized in the innovation of trade practice and the customs administration innovation FTA origin agent.

• 한국안전학회지
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• 제23권3호
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• pp.71-78
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• 2008

This study aims to identity the age group where driving performance significantly decreases based on the data collected from the Korea Transportation Safety Authority's driver aptitude tests in 2006. The test includes following six driving simulator-based tests: estimation of moving objects' speed, estimation of stopping distance, three tests for drivers' multi-task ability, and kinetic depth perception. These six test results were utilized for the identification of the age threshold applying the CART technique, suggesting driving ability significantly be decreased over 50s. This finding was confirmed by two analyses using the accident history data containing the information of accident and non-accident drivers and the degree of accident severity. The results of this study imply that accident prevention efforts should be enhanced over a wider range of age group than the current practice where the age of 65 is generally applied for the threshold dividing senior and non-senior driver groups.

• 한국수학사학회지
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• 제30권4호
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• pp.247-258
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• 2017

The goal of this essay is to examine metaphors for mathematics and to discuss philosophical problems related to them. Two metaphors for mathematics are well known. One is a tree and the other is a building. The former was proposed by Pasch, and the latter by Hilbert. The difference between these metaphors comes from different philosophies. Pasch's philosophy is a combination of empiricism and deductivism, and Hilbert's is formalism whose final task is to prove the consistency of mathematics. In this essay, I try to combine two metaphors from the standpoint that 'mathematics is a part of the ecosystem of science', because each of them is not good enough to reflect the holistic mathematics. In order to understand mathematics holistically, I suggest the criteria of the desirable philosophy of mathematics. The criteria consists of three categories: philosophy, history, and practice. According to the criteria, I argue that it is necessary to pay attention to Pasch's philosophy of mathematics as having more explanatory power than Hilbert's, though formalism is the dominant paradigm of modern mathematics. The reason why Pasch's philosophy is more explanatory is that it contains empirical nature. Modern philosophy of mathematics also tends to emphasize the empirical nature, and the synthesis of forms with contents agrees with the ecological analogy for mathematics.

• 대한수학교육학회지:수학교육학연구
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• 제25권4호
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• pp.549-569
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• 2015

관찰의 도제경험으로 형성한 교수 학습신념의 반성은 예비교사기간의 중요한 과제이다. 이 연구는 교사가 정답과 오답의 여부를 판단해주어야만 한다는 예비교사들의 교실대화에 대한 통상적인 교수관을 표면화하고 도전했으며, 결과적으로 교수 학습신념의 반성과 변화를 유도했던 수업관찰강의의 구체적인 과정과 결과를 분석하였다. 이 사례연구는 예비교사교육에서 새로운 교수관행을 육성하기 위하여, 교사교육자가 예비교사의 구체적인 교수신념을 표면화하고 이를 수업관찰과 텍스트 등을 이용하여 동요시키고 논박하는 것이 효과적인 전략이 될 수 있음을 보여주고 있다.

• 대한가정학회지
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• 제47권9호
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• pp.55-69
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• 2009

The purpose of this research was to analyze scolding experiences of three parents with children of same gender. For this research, a narrative inquiry was used as the research method. The research results showed that scolding toward children and scolding from parents resembled each other while the experiences of the three parents regarding scolding were revealed as the following four larger themes and three smaller themes: mimicking the scolding of their parents (taking on the parental role toward the projected, internal self of the past, acceptance of familiarity, providing a safety fence to the children), transforming the scolding of their parents, projecting the unsolved task of parenting to children, beginning to transform and evolve scolding, and cautious practice within daily living. In the discussion, methods for transforming and evolving scolding based on experiences of the three parents regarding scolding were studied, while research on parents scolding children with differing genders and how positive experience such as praising, encouragement, and support, from parents reemerged within children are suggested.

• 한국CDE학회논문집
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• 제13권1호
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• pp.8-17
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• 2008

Putting a high value on individual preferences is a modern trend that more and more companies are considering for their product design and development and the apartment design is not an exception. Most apartments today are built using similar design with no room for customization. People in general want their tastes to be reflected in the design of their apartment. However, delivering what customers like to the construction company may not be an easy task in practice. For this reason, an intuitive and effective medium between the company and customers for effective communication is needed to ameliorate such a difficulty and in response to this necessity, we developed a test platform for the virtual model house which provides a user with the customization of the apartment using haptic interactions. In our virtual environment, a user can explore an apartment and change the interior based on their taste and feel through intuitive haptic interactions.

• Steel and Composite Structures
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• 제8권3호
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• pp.217-230
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• 2008

The increasing use of performance-based approaches in structural fire engineering design of multi-storey composite buildings has prompted the development of various tools to help quantify the influence of tensile membrane action in composite slabs at elevated temperatures. One simplified method which has emerged is the Bailey-BRE membrane action method. This method predicts slab capacities in fire by analysing rectangular slab panels supported on edges which resist vertical deflection. The task of providing the necessary vertical support, in practice, requires protecting a panel's perimeter beams to achieve temperatures of no more than $620^{\circ}C$ at the required fire resistance time. Hence, the integrity of this support becomes critical as the slab and the attached beams deflect, and large deflections of the perimeter beams may lead to a catastrophic failure of the structure. This paper presents a finite element investigation into the effects of vertical support along slab panel boundaries on the slab behaviour in fire. It examines the development of the membrane mechanism for various degrees of edge-beam protection, and makes comparisons with predictions of the membrane action design method and various acceptance criteria.

• 한국도서관정보학회지
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• 제44권2호
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• pp.27-50
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• 2013

본 연구의 목적은 학교도서관의 스마트러닝 수업 모형을 정보활용교육 측면에서 개발하는 것이다. 수업 모형은 ADDIE 모형과 ASSURE 모형을 기반으로 학교도서관의 특성에 맞게 도서관의 시설, 자료, 인적자원, 정보문제 해결과정, 협동수업 및 블렌디드 학습, 스마트 디바이스의 이용 등이 고려되었다. 수업 모형은 "학습목표 설정${\rightarrow}$학습자 분석${\rightarrow}$학습환경 분석${\rightarrow}$학습과제 분석${\rightarrow}$교수 전략${\rightarrow}$매체 선정 및 개발${\rightarrow}$수업적용${\rightarrow}$평가"의 순서로 개발하였다. 또한 학교도서관 스마트러닝의 실제적인 상황에 대한 이해를 돕기 위해서 수업 예시를 제시하였다.