브라질 식품시장 현황

권선자 한국식품산업협회 1997 좋은식품 Vol.142 No.-

사랑과 꿈을 키우는 방과 후 학교 운영 사례

권선자 국립특수교육원 2007 지역사회 기반 특수학교(급)의 방과 후 활동 운영 방안 Vol.2007 No.

불소함유여부에 따른 치면열구전색제의 전단결합강도에 관한 실험적 연구

백병주,김재곤,허선,권선자 大韓小兒齒科學會 1996 大韓小兒齒科學會誌 Vol.23 No.2

This study was to evaluate shear bond strength fluoride-relesing sealant and nonfluoride-relesing sealant to enamel surface of bovine tooth. 80 extracted bovine teeth were randomly assigned to four groups,and four kind of sealants including Teethmate-A(Kuraray Co.),Teethmate-F(Kuraray Co.),Helioseal(Vivadent Co.),Helioseal-F(Vivadent Co.) were bonded to exposed enamel surfaces using silicon plate. Shear bond strength was determined in an instron universal testing machine at a crosshead speed of 1mm/min.Then,the fracture surfaces of test specimens were investigated with scanning electron microscope. The obtained results were as follows; 1.The shear bond strength decreased in the following oder:Teethmate-A(18.31MPa),Teethmate-F(11.90MPa),Helioseal(11.74MPa),Helioseal-F(10.64MPa). 2.The shear bond strength of Teethmate-A showed significantly higher than that of Teethmate-F(P<0.05),but Helioseal and Helioseal-F didn't showed statistically different(P<0.05). 3.According to the SEM,Teethmate-A group showed cohesive failure,and Teethmate-A group & Helioseal group showed mixed pattern of cohesive failure and Helioseal-F group showed adhesive failure.

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.

Nd:YAG 레이저 照射에 따른 琺瑯質의 變化에 關한 實驗的 硏究

배태성,권선자,김철중,백병주 大韓小兒齒科學會 1992 大韓小兒齒科學會誌 Vol.19 No.2

The purpose of this study was to investigate the changes of polished and caries enamel of third molar when they were irradiated by the CW Nd : YAG laser with optical fiber delivery system and the pulsed Nd:YAG laser. The author investigated the hardness of lased enamel surfaces with the energy density of 40 J/㎠ and the shear bond strength between etched enamel and composite resin, and examined the polished and caries enamel surfaces irradiated by CW Nd : YAG laser with the energy density of 20-120 J/㎠ by using scanning electron microscope. The obtained results were summerized as follows : 1. The Knoop hardness decreased significantly after irradiating the Nd : YAG laser with the energy density of 40 J/㎠(P<0.01). 2. The shear bond strength of enamel showed a significant difference before and after irradiating the Nd : YAG laser with the energy density of 40 J/㎠(P>0.05). 3. SEM photographs showed the irregular microcracks and the structural change of lased enamel surface. 4. SEM photographs showed the aspect of decrease in decalcification of enamel prism after irradiated with the energy density of 40 J/㎠. 5. SEM photographs showed the aspect of removal in caries enamel when they were irradiated with the energy density of 70 J/㎠.

Comparison of IRIS Iq200, UF-1000i, and Cobas u701 Module Automated Urine Sediment Analyzers

최현지,양다해,권선자,강푸름,박하성,김태윤,황현용 대한진단검사의학회 2020 Laboratory Medicine Online Vol.10 No.4

Background: We sought to compare the performance of three commercially available automated urine sediment analyzers that represent the current urine sediment analysis technology. Methods: A total of 232 patient samples were analyzed using manual microscopy and three automated analyzers: IRIS Iq200 (Beckman Coulter, USA), UF-1000i (Sysmex, Japan), and Cobas u701 (Roche, Switzerland). We analyzed precision, linearity, carry-over, concordance rate, and agreement between the three analyzers and manual microscopy. Results: The repeatability and within-laboratory precision showed results similar to those of previous studies. All analyzers showed excellent linearity. The carry-over rates were within 1%. The correlation coefficient (r) between the three analyzers and manual microscopy was good. Regarding red blood cell (RBC), the UF-1000i showed a better concordance rate (90.52%) with manual microscopy than the other two analyzers and the agreement was substantial for UF-1000i (κ=0.63) and IRIS Iq200 (κ=0.61). Regarding white blood cell (WBC), Cobas u701 showed the best concordance rate (96.55%) and the agreement was moderate for IRIS Iq200 (κ=0.57) and Cobas u701 (κ=0.56), and fair for UF-1000i (κ=0.47). Regarding epithelial cell (EPI), IRIS Iq200 showed the highest concordance rate (99.2%) and the agreement was moderate for IRIS Iq200 (κ=0.59) and Cobas u701 (κ=0.54), and fair for UF-1000i (κ=0.40). Conclusions: IRIS Iq200 offered the best agreement with manual microscopy for WBC and EPI count, while UF-1000i showed a better agreement for RBC count. The agreement is insufficient for fully replacing the manual microscopy.

매복 견치 및 저위교합 제 1대구치의 자가 이식에 의한 치험례

이승익,김재곤,권선자,백병주 大韓小兒齒科學會 1995 大韓小兒齒科學會誌 Vol.22 No.2

In orthodontic treatment of certain cases of tooth loss, aplasia, or ectopia, autotransplantation is sometimes valid treatment alternative often provides and improved result, compared to conventional orthodontic treatment, an apprporiate donor tooth is available and the anatomic circumstances permit it. Clinically, successful transplants must show a radiolucent space between the roots and surroundings bone. There must be no evidence of ankylosis, no permanent root resorption, and no inflammation. Histologically, the criterion of success is a normal and functional periodontal ligament between the root surfaces of transplants and the bone, or gingival connective tissues. The successful autotransplantation of a impacted maxillary canine and infraoccluded mandibular 1st molar is reported. In case Ⅰ, impacted canine with incompletely developed root apex was maintained pulp vitality due to appropriate root development and short extraoral time, atraumatic surgical procedure. In case Ⅱ, infraoccluded molar was started endodontic treatment after 3 weeks. Because of closed apex, possibility of revasculization is rare. Both case Ⅰ, Ⅱ did not ankylosis and the periodontal and periapical tissues appears to be normal after 3 months. In autotransplantation cases it is important to transplant the tooth as quickly and as atraumatically as possible to dimish the chance of ankylosis and root resorption. In all cases of transplantation, patient selection minimal operating time, and good oral hygine will increase the chance for a successful prognosis.

초등학생의 고무줄놀이 안무활동 지도를 위한 영상 교재 구축

이관형,김명철,권선자 서울敎育大學校 初等敎育硏究所 2002 한국초등교육 Vol.13 No.2

The purpose of this study is to build elastic string play activities systematically and to provide learning-steps as follows : basic-motions, developed-motions, applied- motions and choreographic-motions. And as teaching materials, we make VCD including learning-step simulation by command and music, and CD including music. 1. We make basic-motions as we analyze a form and constituent of elastic string play. Basic-motions are as follows : Stabbing, Spinning, Hopping, Kicking, Winding, Stamping 2. As we infer from changing the direction and the movement of basic-motions, we construct developed-motions. 3. As we connect two different basic-motions and pairs them, we develop applied-motions. 4. We make our students practice above motions according to above sequence by command and afterward practice by music. 5. After students learn above motions, we let our students connect above motions with such motions as clapping, changing spot, aerobic motion and folk dance motion. 6. We make our students create and practice choreographic-motions smoothly by group studying, practicing by command, doing trial and error and completing by music.