가시광선영역에서 shade guide에 따른 광투과도 특성 연구

최근배,박찬운,송창용,고석민,Choi, Keun-Bae,Park, Charn-Woon,Song, Chang-Yong,Ko, Sok-Min 대한치과보철학회 2000 대한치과보철학회지 Vol.38 No.2

The purpose of this study was the evaluation of spectral transmission of the commercial three shade guides and the relationship of hue, value, and chroma according to the transmission rate. The spectral transmittance of three shade guides - Vita Lumin Shade Guide, Vintage and Unibond Shade Guide, and Vitapan 3D-Master Shade Guide - were measured. For direct transmission measurements, each shade tabs were placed at the entrance port of the 1mm diameter intergrating sphere. The intensity of the light source passing through the shade tabs to the right angle was continuously recorded for wavelength from 400 to 700 nm. A transmission spectrum and digital data were obtained for each measurement and they were evaluated using Microcal Origin program. The obtained results of this study were as follows : 1. In Vita Lumin Shade Guide, sum of the transmission rate of the shade tabs at the wavelength 400-700nm was decreased in agreement with the arrangement order at each A, B, C, D group, except D4 shade tab. However, there were no relationships between the transmission rate of the shade tabs and the value-oriented. 2. In Vintage and Unibond Shade Guide, sum of the total transmission rate of the shade tabs was decreased in agreement with the arrangement order at each A, B, C, B group. When all shade tabs arranged in value-oriented, transmission rate was accord with the order, except D4 shade tab. 3. When shade tabs of the Vitapan 3D-Master Shade Guide have the same value and hue, sum of their total transmission rate decreased in accordance with the chroma-oriented. When the shade tabs have the same value and chroma, there were no differences from the order of the transmission rate to the various hue type. However, in the 'R' tabs of reddish hue type, the transmission rate increased at the long wavelength range area. In conclusion, we need the quantitative analyzing instruments in transmission determination. Vitapan 3D-Master Shade Guide covers the tooth color space taking into account the parameters of the systematic value, chroma, hue oriented, and the transmission rate relatively accorded with that sequence.

Strategic serial extractions and immediate implantation for interdental papilla preservation: A case report

최근배,이정진,안승근,서재민,Choi, Geun-Bae,Lee, Jung-Jin,Ahn, Seung-Geun,Seo, Jae-Min The Korean Academy of Prosthodonitics 2017 대한치과보철학회지 Vol.55 No.3

치간유두의 보존을 위해서는 치간골의 혈액공급이 매우 중요하다. 인접한 임플란트 사이의 치간유두를 재생하는 것은 치아와 임플란트 사이의 치간유두보다 어렵다. 그러므로 인접한 임플란트를 식립할 경우 임플란트 사이 조직을 보존하는 것이 필요하다. 이를 위해서 전략적 발치술, 즉시 임플란트 식립 및 임시 보철물 제작은 임플란트 주위 조직을 보존하는데 효과적인 방법으로 소개되었다. 본 증례는 손상된 양측 상악 중절치를 전략적 연속 발치술 및 임플란트 즉시 식립을 통해 회복한 환자로 24개월 뒤 임플란트 주위 조직 및 치간 유두가 안정적으로 보존되었기에 이를 보고하는 바이다. Maintaining the blood supply of the interdental alveolar bone is crucial for preserving the interdental papilla. Rebuilding the interimplant papilla between adjacent implants is more difficult than rebuilding the interdental papilla between the natural tooth and implant. Therefore, preserving the interimplant tissue is necessary when adjacent implants are closely placed. In this case report, three effective methods for maintaining the surrounding tissue, namely strategic serial extraction, immediate implantation, and provisionalization of adjacent maxillary central incisors, were performed. The marginal gingiva and interimplant papilla were well maintained for 24 months.

두 조작의 합성으로서의 유리수 곱의 이론적 배경 고찰

최근배,Choi, Keunbae 영남수학회 2017 East Asian mathematical journal Vol.33 No.2

A rational number as operator is eventually that it is considered a mapping. Depending on how selecting domain (the target of operation by rational number) and codomain (including the results of operations by rational number), it is possible to see the rational in two aspects. First, rational numbers can be deal with functions if we choose the target of operation by rational number as a number field containing rationals. On the other hand, if we choose the target of operation by rational number as integral domain $\mathbb{Z}$, then rational numbers can be regarded as partial functions on $\mathbb{Z}$. In this paper, we regard the rational numbers with a view of partial functions, we investigate the theoretical background of the relationship between the multiplication of rational numbers and the composition of rational numbers as operators.

다각형의 등주문제: Geometer’s Sketchpad로 수학적 추론과 정당화하기

최근배 ( Choi Keunbae ) 한국수학교육학회 2018 수학교육논문집 Vol.32 No.3

이 논문에서는, 영재학생들을 위한 학습 자료의 관점에서, 선행연구(최근배, 2009, 2011; 이재운, 최근배, 2015)에서 미비한 점이 있는 짝수 각형의 등주문제를 해결하는 과정을 Geometer’s Sketchpad로 추론하고 정당화하는 아이디어를 논의하고 있으며, 주된 아이디어는 두 가지의 변형([그림 III-1]과 [그림 III-3])을 사용하는데 나타나는 수학화의 과정이다. 여기에 사용된 아이디어는 제주대학교 영재교육원 수학반 심화과정 프로그램 (등주문제 또는 디도여왕의 문제, 2004년부터 현재까지) 운영 중에 도출된 것이다. In this paper, we deal with the isoprimetric problem of polygons from the point of view of learning materials for elementary gifted students. The isoperimetric problem of the polygon of odd degree can be solved by E-transformation(see Figure III-1) and M-transformation(see Figure III-3). But in the case of even degree’s polygon, it is quite difficult to solve the problem because of the connected components of diagonals (here we consider the diagonals forming triangle with two adjacent sides of polygon). The primary purpose of this paper is to give an idea to solve the isoperimetric problem of polygons of even degree using the properties of ellipse. This idea is derived from the programs of the Institute of Science Education for Gifted Students in the Jeju National University.

항만운영자로서 BPA와 PSA의 비교연구 : 항만공사의 자율성을 중심으로

최근배(Keun-Bae Choi) 한국해양비즈니스학회 2020 해양비즈니스 Vol.- No.47

This study made a comparative study about the level of the autonomy between Busan Port Authority(BPA) and Port of Singapore Authority(PSA) as a global terminal operator. Singapore government privatized a PSA in 1997. And after that, PSA has grown global terminal operator in Singapore port and major port in the world. These achievements was derived from allowing the autonomy to PSA, even though Singapore government has 100% stake in PSA, Korea is a country having highly foreign trade dependency. And almost exportimport cargoes are transporting through port. So port industries are key industries supporting national economy. It is widely known fact that the status and role of Busan port in Korean port industries is connected with the development of the nation’s whole port industries. This is a imperativeness that the development of BPA should be connected with the development of the Busan port deeply. In order to achieve this goals, BPA must have wider autonomy than what it has What we have to learn from PSA case is that (1) PSA has experienced various situations for a long time and known the timing and contents of the suitable policies through the various experience, (2) Singapore government have waited for a long time PSA haviing experience and insight about port logistics trend and future stream.

초등수학 도형영역에 제시된 정의에 관한 교사의 인식과 오류

최근배 ( Keun Bae Choi ),우숙경 ( Suk Kyoung Oh ) 한국수학교육학회 2008 수학교육 Vol.47 No.2

LACTIC ACID DEHYDROGENASE ISOENZYME IN THE PERIODIC AMPUTATED RAT INCISOR PULP

Choi Kuen-Bae(崔根培) 대한치과의사협회 1972 대한치과의사협회지 Vol.10 No.1

초등 영재 교수,학습을 위한 평면에서의 등주문제 내용구성 연구 -기하적인 방법을 중심으로-

최근배 ( Keun Bae Choi ) 한국수학교육학회 2011 수학교육 Vol.50 No.4

In this article, we study on the teaching design, focused on the geometric methods, of 2-D isoperimetric problem for the elementary mathematically gifted students. For our teaching design, we discussed the ideals of Zenodorus`s polygon proof, Steiner`s four-hinge proof, Steiner`s mean boundary proof, Steiner`s snowball-packing proof, Edler`s finite existence proof and Lawlor`s dissection proof, and then the ideals achieved were modified with the theoretical backgrounds-the theory of Freudenthal`s mathematisation, the method of analysis-synthesis. We expect that this article would contribute to the elementary mathematically gifted students to acquire and to improve spatial sense.

로테르담 규칙과 한국 상법 상 선화증권의 물권적 효력에 관한 비교연구

최근배(Keun-bae Choi) 한국해양비즈니스학회 2014 해양비즈니스 Vol.- No.29

The purpose of this study is to compare Korean commercial law with Rotterdam Rules regarding real right's validity of bills of lading. The real right's validity of bills of lading have accepted by international trade circle for a long time and this character of bills of lading contributes to activate international trade transactions. From a general point of view, the contents regarding the real right's validity of bills of lading in Korean commercial law is not widely different from the Rotterdam Rules. Bills of lading in commercial law and transport document in Rotterdam rules is almost same in fundamental aspect practically. But the provisions about electronic bills of lading and negotiable electronic record in two regulation have somewhat difference. Especially there is a great difference between electronic bills of lading issuer and negotiable electronic record issuer. Electronic bills of lading in commercial law is issued by register agncy that nominated by Minister of Ministry of Justice. But electronic transport record in Rotterdam Rule is issued by carrier. This point is debatable to some degree. Except this point, Rotterdam rules has more plentiful provisions about the real right's validity of bills of lading than Korean commercial law. So Rotterdam Rules can cope with more various situation about using bills of lading. Accordingly we can get more implications from Rotterdam Rules when we considered to revise the commercial law.

시리즈 E : 초등 영재 교육에서의 구성주의 교수,학습 모형 적용 연구 -알고리즘 문제를 중심으로-

최근배 ( Keun Bae Choi ),김홍선 ( Hong Seon Kim ) 한국수학교육학회 2007 수학교육논문집 Vol.21 No.2