매복 반곡된 상악 중절치의 외과적 처치에 관한 증례보고

백병주,윤현두,김미경 大韓小兒齒科學會 1991 大韓小兒齒科學會誌 Vol.18 No.2

The treatment of unerupted tooth are surgical exposure,orthodontic repositioning ,transplantation and extraction. In treating unerupted tooth,it must be considered to position and dilaceration of unerupted tooth,patient age,requirement of patient. Case mentioned here is autotransplantation of unerupted tooth and dilacerated central incisor. For the successful treatment,it is required space of trancsplanted tooth and good oral hygiene before surgery.We escape trauma of periodontal ligament and cementum during surgery.We observe occlusion,inflammation,development of roots after transplantation.

와동내에 조사된 열의 전도양상에 관한 연구

윤현두,허선,김재곤,이두철,백병주 大韓小兒齒科學會 1998 大韓小兒齒科學會誌 Vol.25 No.3

The purpose if this study was to evaluate temperature change occurred in enamel, dentin and pulp due to the heat from cavity prepration with laser. We made three models had different cavity depth : cavity depth of model Awas 3.52mm, model B was 2.32mm, model C was 1.16mm. We irradiated cavity base with thermal capacity of 30J,100J,300J/㎤s during few seconds and studied the change of temperature in tooth during 10 seconds, and estimated change of thermal capacity by different irradiated site and exposure time. AT 300j/㎤s irradiation for 2 seconds, the temperature of irradiated surface was elevated fast according to irradiated thermal energy during I second, In proportion to continuous exposure time, temperature elevated slowly The surface temperature was 1370℃. After discontinue of thermal irradiation, the heat of irradiated surface was diffused in dentin and pulp and the greatest temperature was made, The greatest temperature was disappeared within 10 seconds The greatest temperature of the inner part of model brought about very severe change by different depth. Temperature in pulp was raised by the greater irradiated energy density and exposure time.

불소 및 레이저가 우치법랑질의 인공우식병소에 미치는 영향

백병주,윤현두,김재곤,주훈 大韓小兒齒科學會 1997 大韓小兒齒科學會誌 Vol.24 No.3

The purpose of this study was to examine the morphological characteristics and combined effects of fluoride application and laser irradiation on artificial caries-like lesion formation in bovine enamel. Enamel specimens were divided into five experiment group and placed in no-treatment(group C), APF application alone(group F), laser irradiation alone(group L), APF application before laser irradiation (group FL), and APF application after laser irradiation (group LF) on artificial caries-like lesion. Sound enamel was used as a control group. The ultrastructural changes and physical effects of the fluorided and lased enamel has been investigated by using SEM, enamel solubility and microhardness test as well as distributions of calcium, phosphorus and fluoride in internal enamel by using EPMA. The following results were obtained. 1. In the all experiment groups, the amounts of dissolved calcium of enamel surfaces signigicantly decreased according to increasing exposure time of acid solution than control group(P<0.001), Group L showed higher than that group FL and LF in 30 and 60 min(P<0.05). 2. The microhardness values of enamel surface in the control group was highest than that in the other experiment groups. Group F, L, FL and LF were significantly increased than group C(P<0.001). 3. The enamel surface treated with APF produced deposites of numerous small globules and lased enamel showed a cracker-like appearance with microcrack and small pore. Numerous deposits were infiltrated in the fissrued portion of enamel treated with APF after laser irradiation. 4. In the case of APF application alone, the elevation of the fluoride profile can be seen within 5㎛ of the outermost layer and a similar profile observed in the specimen treated with APF before laser irradiation. However, the specimen treated with APF after laser Irradiation showed a large elevation within 10㎛ of the outermost layer of the enamel. 5. The higher Ca/P ratios were observed in 10㎛ depth of lased and fluorided enamel when compared to the sound and carious enamel. The fluoride content decreased rapidly with distance from enamel surface, in the group F, fluoride concentration was significantly higher than that in the group C, L, FL, LF and control group according to increasing enamel depth(P<0.05).

불소농도가 인공우식 범랑질의 재석회화에 미치는 영향

윤현두,백병주,김재곤 大韓小兒齒科學會 1996 大韓小兒齒科學會誌 Vol.23 No.1

The purpose of this study was to evaluate the remineralized effect of fluoride on artificial carious enamel after topical fluoride application and to certificate the most appropriate fluoride concentration. Artificial demineralized bovine enamel blocks were randomly assigned to four groups, and placed in fluoride, 100, 5,000 and 12,000ppm acidulated phosphate fluoride solution. Sound enamel blocks without artificial carious lesion were used as control group. In this study, the morphological characteristics of treated enamel surface and effect of fluoride concentration on remineralization of artificial carious enamel has been investigated by using scanning electron microscopy, chemical analysis and electron probe microanalysis compared with the effect of various fluoride concentration. The Following results were obtained. 1. The enamel surface treated with 100ppm APF was observed more demineralized surface with lots of holes and loosely bounded a few globules. 5,000ppm APF treatment produced a deposits of numerous spherical globules 0.5∼1㎛ in diameter and distinctive rectangular and cuboidal shaped deposits were formed by 12,000ppm APF treament. 2. Amount of KOH-soluble fluoride on enamel surfaces was increated according to treated fluoride concentration level. In the Ⅳ and Ⅴ group were showed significantly higher than that in the Ⅲ group(p<0.05). 3. After treatment with 5,000 and 12,000ppm APF, a remarkable elevation of the fluoride profile was observed within 30㎛ of the outermost layer and was accompanied simultaneously by a high elevation of the calcium profile. However, specimens treated with 100ppm APF showed only a small elevation of fluoride within whole depth than that in the sound and demineralized enamel specimens. 4. In the Ⅳ and Ⅴ group, Ca/P weight percent ratio were showed higher than that in the Ⅰ, Ⅱ, Ⅲ group in 5 and 15㎛ depth, and fluoride content were showed statistically different than that in the Ⅰ, Ⅱ, Ⅲ group in all depth(p<0.05).

공공분야 전자상거래 추진에서 나타난 정보기술 관점의 사례분석 연구

이재두,김정태,김병초 한국경영과학회 2002 한국경영과학회 학술대회논문집 Vol.- No.1(1)

본 연구에서는 국가 및 공공부문에서 전자상거래를 추진할 때 정보기술과 관련되어 발생하는 공통되는 문제를 도출하여, 향후 전자상거래를 추진할 때 시사점 및 교훈을 제시하고, 전자상거래를 추진하려고 하는 조직의 시행착오 최소화 및 이와 관련된 위험요소를 식별하기 위한 아이디어를 찾고자 한다. 이를 위해 공공에서 추진한 전자상거래와 관련된 정보화사업의 사례와 정보기술관점의 점검활동인 정보시스템감리의 결과를 기술적 관점에서 분석한다. 그리고 공공부문에서의 전자상거래관련 정보화사업을 추진을 할 때 기술적인 관점에서 유의해야 할 시사점을 도출하고, 향후 국가 정보화 사업의 효율성 및 효과성을 제고를 할 수 있는 방법을 제시 하고자 한다.

월악산을 중심으로 한 교육수준별 휴양자원의 이용자 실태

정대성, 민두식, 김병로 忠北大學校 1986 論文集 Vol.32 No.-

-본문참고-

불소적용시 법랑질과 상아질에서 불화칼슘형성의 차이에 관한 실험적 연구

김재곤,권선자,윤현두,안수현,백병주 大韓小兒齒科學會 1998 大韓小兒齒科學會誌 Vol.25 No.1

The purpose of this study was to compare the amount of calcium fluoride deposited on the enamel and dentin surface and to obtain information on the morphological change and crystallographic details of mineral deposition after 12,000ppm APF application in vitro. The bovine enamel and dentin blocks were randomly assigned to eight groups according to artificial caries lesion formation and difference of fluoride application time. The fluoride concentration and morphological characteristics on the treated enamel and dentin surface were investigated by using fluoride quantitative analysis and SEM. The powdered enamel and dentin of the intact bovine incisors were prepared for the X-ray diffraction analysis. The following results were obtained. 1. The amounts of KOH-soluble fluoride on the carious enamel and dentin surface after 24h APF application were higher than after only 5min APF application(P<0.05), but in the case of the sound enamel and dentin surface were similar after 5min and 24h application (P>0.05). The fluoride content was highly increased in the carious dentin as compared with sound dentin after APF application(P<0.05). 2. The caruous enamel surface after APF application, the demineralized enamel surface were recovered a more dense enamel surface and precipitation of crystal was observed a distintive surface layer of spherical globules of about 1 m diameter. In the case of the fluorided carious dentin surface, precipitation of calcium fluoride-like material was deposited both inside the dentinal tubules as well as in the intertubular regions. 3. The crystallographic structure of powdered enamel and dentin after 24h APF application had large crystallities of apatite and CaF2 diffraction peaks in the enamel as compared with dentin. The diffraction data collected from the 27.50-29.50(2) angular range of the powdered enamel, the (105) apatite, (225) apatite and (111) CaF2 peaks of the enamel crystallities were detected after 24h APF application.

Current Status of the Synchrotron Small - Angle X - ray Scattering Station BL4C1 at the Pohang Accelerator Laboratory

Byeong Du Lee,Tae Joo Shin,Moon Hor Ree,Jorg Bolze,Je Han Kim,Jung Yun Huang,Seung Yu Rah,Hwa Shik Youn 한국고분자학회 2002 Macromolecular Research Vol.10 No.1

Design of Remote Control Drone for Agricultural using Flight Controller to Reduce Pesticide Damage

Byeong-Du Yim(임병두),Min-Woo Cheon(천민우) 한국디지털콘텐츠학회 2021 한국디지털콘텐츠학회논문지 Vol.22 No.8

유한요소법과 프라이자흐모델이 결합된 해석기법을 이용한 슬롯 수별 손실과 효율 평가에 따른 동기형 릴럭턴스 전동기의 새로운 고정자 설계

이병두(Byeong-Du Lee),이중호(Jung-Ho Lee),윤태원(Tae-Won Yun) 대한전기학회 2010 대한전기학회 학술대회 논문집 Vol.2010 No.7

This paper deals with the stator design solution of a synchronous reluctance motor (SynRM) with various slot number by loss & torque evaluations related to the slot open, teeth width using coupled Preisach modeling & FEM. The coupled Finite Elements Analysis (FEA) & Preisach model have been used to evaluate the nonlinear solution. Comparisons are given with characteristics of SynRM according to stator winding, slot number, slot open, teeth width variation, respectively.