• 대한치과의사협회지
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• 제58권3호
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• pp.169-179
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• 2020

The purpose of this study was to investigate the principal reasons for primary teeth extractions and the tooth type extracted in children. 1159 patients were selected in this study. Dental records and radiographs were reviewed and age, gender, medical history, type of tooth extracted and the reasons for extraction were collected. The data were statistically analyzed using Chi-square test. Total 2078 primary teeth were extracted. Central incisors(34.1%) were most frequently extracted. Extractions due to physiological mobility(77.5%) were the most frequent followed by caries(13.8%), orthodontic(3.9%), trauma(1.7%). Reason for the extraction was different according to age (p = 0.000), but there was no difference according to gender (p = 0.109). While extractions due to physiological mobility predominated overall, reason for extraction was different according to the tooth type. There was no previous treatment in 54.6% of primary teeth extracted due to caries. Excluded physiological mobility, caries are the most common reason for extraction of primary teeth. The importance of preventive care should be emphasized in order to preserve primary teeth and improve children's oral health.

• 대한안전경영과학회지
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• 제20권3호
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• pp.21-26
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• 2018

This paper describes result of a study on safety against a fire of charging cable for mobile phone for vehicle. Combustion on the USB cable in the car was happened while driving. Gas coming from the burning USB cable could be a reason which can make a secondary car accident since the driver also can be embarrassed while driving. In order to prevent a secondary car accident connected on the road, to research a reason why USB cable can emit gas and be burned in charging. We did simulation test with abnormal fault condition for the electronic component on the board in the USB cable. So we get the result from abnormal fault condition simulation test, for instance, shorted test for output terminal of 8 pin switch, shorted test for chip resistor after thermal aging in the condition $25^{\circ}C$, 93 % RH during 48 hours. To analysis the result of all test, Combustion on the USB cable was not the 8 pin but other electrical component such as a chip resistor. Therefore we guess that the reason for USB cable combustion in charging in a car was not 8 pin and a LED but another defective component.

• 한국의상디자인학회지
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• 제19권1호
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• pp.15-25
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• 2017

The purpose of this study was to investigate the effect of sports shoes benefit pursuit on purchase reason, purchase evaluative criteria, and purchase information resource of high school girls. The data were collected between June 2016 from 287 high school girls in their's, living in Seoul, Daejeon, Gwangju, Daegu, Busan, and Changwon. The data have been analyzed by using SPSS program. The methods of factor analysis, reliability, and regression have been adopted for the data analysis. The results of this study were as followings: The factors of sports shoes benefit pursuits consisted of four dimensions of fashion-pursuit, brand-pursuit, convenience-pursuit, and economy-pursuit. The factors of purchase reasons consisted of three dimensions of syntony, recreation, and economic utility. The factors of purchase evaluative criteria consisted of three dimensions of management, aesthetic appreciation, and symbolism. The factors of purchase information resource consisted of two dimensions of media and human. Sports shoes benefit pursuits had an influence on purchase reasons, purchase evaluative criteria, and purchase information resources. In particular, the fashion-pursuit of Sports shoes benefit pursuits had a great influence on purchase reasons. The brand-pursuit of Sports shoes benefit pursuits had a great influence on purchase evaluative criteria and purchase information resources. It is highly expected that this study is used as the useful sources of sports Shoes industry.

• 디자인학연구
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• 제12권2호
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• pp.53-62
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• 1999

본고의 목적은 심볼디자인을 하는데 있어서 첫째, 디자이너들이 심볼의 굿디자인을 동양의 음양오행사상에 바탕을 시각적 분석을 통하여 새로운 적응방법을 모색하는 것이며, 둘째 심볼의 구조형태 분석과 감성인식 방법을 다른 각도에서 파악하여, 새로운 장조기법의 하나로서 심볼디자인의 사고영역을 넓히는데 그 목적을 둔다.

• 고전문학과교육
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• 제16호
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• pp.237-272
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• 2008

In this thesis I aim at investigating at the distinctive characteristic of homesickness in written by Hong sun-hag and the mean of the distinctive characteristic. The result as follow. The aspect of homesickness in the Yeonhaengnok : The first, the traveler express the reason that cause the homesickness. The reason that cause the homesickness is various. The second, the traveler express the emotional conflict between worry about the family and ambition of travel in Yeonhaengsanmun. The third, the traveler express the reason that cause the homesickness and yearn for his home. The traveler express the individual experience connected with the family in Yeonhaengsanmun, the universal experience connected with the family in Yeonhaenghansi. The distinctive characteristic of homesickness in the and the mean of the distinctive characteristic : The first, the aspect of homesickness in the is all aspect of homesickness. The author of synthesizes homesickness. The second, the scenery rouse the traveler' homesickness and the traveler expresses homesickness by the empathy to the scenery. The mean of expressing by the scenery is that the expression succeed the 17th century Yeonhaenggasa. The third, the traveler concretely expresses his inner world. The mean of concretely expressing the inner world is that the expression is related to the realism of expressing the inner world.

• 한국응급구조학회지
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• 제22권3호
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• pp.177-187
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• 2018

Purpose: The purpose of the study was to investigate the causes of non-transport in 119 ambulance services and to describe the difference in response time according to the reason for non-transport. Methods: This study analyzed 42,415 non-transport cases out of 123,158 cases using prehospital care reports in a metropolitan city. The Kruskal-Wallis test and the Wilcoxon-Mann-Whitney test were used to 6,857 cases for which time was recorded. Results: Non-transportation in 20${\bigcirc}{\bigcirc}$ comprised 33.1% of all ambulance services. The reason for non-transport were other reasons (25.5%), cancellation (23.8%), and moving to other vehicles (21.7%). There were differences in ambulance service times according to the reasons for non-transport. The activation interval was the longest (2.68 minutes) in the absence of the patient, and the response interval was the shortest (4.96 minutes) among the cancelled case. The total interval was the shortest time (21.97 minutes) in the cancellation cases and the longest time among the death cases (32.23 minutes). Conclusion: It is important to suggest the direction of development of emergency services by identifying the reasons for non-transport by ambulance services and describing the response time according to the reason for non-transport.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2021년도 봄 학술논문 발표대회
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• pp.123-124
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• 2021

Recently, the danger of fine dust has emerged worldwide. In general, fine dust refers to particulate matter less than 10㎛ and ultrafine dust less than 2.5㎛, and according to the announcement by HEI (Health Impact Research Institute) in 2015, the concentration of ultrafine dust in Korea is the second highest among OECD member countries. It was investigated. In this study, an experiment was conducted to analyze how the diatomaceous earth substitution rate affects the strength characteristics of the permeable block. As the replacement rate of diatomaceous earth increased, the strength decreased. The reason why the strength decreases with the use of diatomaceous earth is that the strength of the hardened body decreases as the structure of the hardened body becomes less dense as the amount of diatomaceous earth increases, and the reason that the strength decreases as the replacement rate of diatomaceous earth increases is the reason for the absorption performance of diatomaceous earth. Therefore, it is judged that a void was generated inside the hardened body while water was absorbed and then evaporated or discharged in the matrix, and accordingly, the strength decreased.

• East Asian mathematical journal
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• 제39권4호
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• pp.455-478
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• 2023

Expectations and interests in blended learning are increasing as universities respond to the educational flow of transition to e-lernring. This study tried to explore and understand the meaning of and the properties of blended instruction. In addition, through the literature review, this study was to find out how bleanded learning affected in teaching and learning situation. Particularly, it was to find out students' preference to the type of blended instruction. Those types are the mixed of or the unique of class instruction(off line), on line, and recorded instruction. To investigate learners' preference to the type of the instruction and also the reason of the preference, in this study, the 27 undergraduate students of the fourth grade in the major of mathematics education in the C university located in G area. By the result, most students preferred the mixed type of instruction involving off line and recorded instruction. The reason is that they could attend to the class while participating in the group activity positively and understand the content through the communication in depth and the instructor's feedback. Because of this reason, they did not prefer to the only one type insturction such as the recorded type.

• 한국콘텐츠학회논문지
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• 제16권11호
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• pp.409-419
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• 2016

본 연구는 커피전문점 방문 동기에 따른 커피전문점의 선택속성에 있어서 차이가 있는지를 살펴보고, 커피 전문점에서 구매하는 커피의 종류에 차이가 발생하는 지를 살펴보고자 한다. 서울 경기지역 대학에 재학중인 대학생 중 커피전문점을 이용한 209명을 모집단으로 분석을 위해서 spss통계 패키지 프로그램을 이용하였다. 커피전문점을 방문하는 동기는 편리성, 사회적 만남, 심리적 요인, 경제적 요인, 정신적 요인 및 습관적 방문 등 크게 6가지로 도출하였다. 6가지 커피전문점 방문동기에 따라 응답자를 집단화하면 경제적 동기나 습관적 동기로 커피 전문점을 방문하는 집단은 다른 집단에 비해 '커피의 다양성'을 더 중요하게 고려하였고, 편리적 동기 및 습관적 동기로 방문하는 집단은 다른 집단에 비해 '종업원의 친절도'를 더 중요하게 생각했으며, 사회적 동기로 방문하는 집단은 '저렴한 커피 값'을 월등히 중요하게 생각하는 것으로 나타났다. 커피전문점 방문동기나 선택속성이 최종 선택한 커피의 종류에 유의적인 영향을 미치지 못하는 것은 특정 종류의 커피(아메리카노, 라떼)를 압도적으로 많이 선택하는 결과이기 때문이며, 이는 커피의 다양성 측면에서 전문점들이 소비자인 대학생들의 선택의 폭을 넓히는 데 충분한 노력이나 차별성을 보여주고 있지 못하는 것에도 원인이 있다 할 것이다.

• 구강회복응용과학지
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• 제35권3호
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• pp.143-152
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• 2019

목적: 이번 연구의 목적은 치과대학병원 보존과로 근관치료적으로 의뢰된 환자들과 치아들의 특성을 진료기록을 통해 살펴보고 영향을 미치는 요인을 분석하는 것이다. 연구 재료 및 방법: 2017년 1월부터 2018년 12월까지 한 치과대학병원 보존과에 내원한 환자들을 대상으로 환자의 진료기록을 통해 근관치료적으로 의뢰되었던 환자를 취합하였다. 총 1171명의 환자 기록을 분석하였다. 의뢰된 치아의 상태가 근관치료 전인지 근관치료 중인지 또는 근관 충전된 이후인지를 초진 당시의 방사선 사진과 진료기록 내용을 토대로 구분하여 3가지 군으로 정리해서 분석하였다. 결과: 의뢰된 치아들의 69.9%가 상, 하악 제1, 2대구치였다. 이전 기관에서 의뢰된 후 치과대학병원에 내원할 때까지 소요된 일수는 평균 9.03일이었고 의뢰서가 있는 경우가 65.6%였다. 주된 의뢰 이유로는 지속되는 임상 증상(통증, 종창, 누공)이 37.9%로 가장 많았으며 진단의 어려움 16.7%, 근관막힘 13.8%, 높은 해부학적 난이도 11.4% 순이었다. 세부적으로 근관치료 전에 의뢰된 경우에는 진단의 어려움이 많았고 근관치료 중에 의뢰된 경우에는 지속적인 임상 증상과 근관 막힘이 많았다. 근관 충전 후에 의뢰된 경우는 지속되는 임상 증상이 대부분이었다. 결론: 대구치인 경우 지속적인 임상 증상과 근관 막힘이 주된 이유인 비율이 높았고 전치의 경우 치근단 수술과 외상 치료의 비율이 높았다.