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Shade guide의 형태가 색상 결정에 미치는 영향
박걸,김동준,이시은,황윤찬,오원만,황인남 大韓齒科保存學會 2005 Restorative Dentistry & Endodontics Vol.30 No.3
This study was conducted in order to assess whether the form of the shade guide affects in deciding the color of the teeth using the shade guide. Eight shade light cured composite resins (Esthet-X, Dentsply, Milford, USA) were used in this study. Shade guides including the model of maxillary central incisors, teeth-form shade guide, doughnut form shade guide, and shade guide with perforated gray shield were prepared with eight shade composite resins and provided the codes randomly. After arranging the models of teeth, 19 dentists working at the clinic of the Dentistry of Chonnam University Hospital and 65 students of college of dentistry, Chonnnam University selected the shade guides corresponding to the color of each tooth on the gray board under the D_(65) standard illuminant. Bl shade showed highest accuracy of about 95% among all shade guides of 3 forms applied to the test and regardless of observer, tooth form shade guide showed the highest accuracy (p < 0.05) , and the doughnut form showed the lowest accuracy (p < 0.05). At the time of deciding on the color of the teeth using the shade guides as a result of above, the forms of the shade guides can affect the accuracy, and it suggests that the development of the diversified forms of shade guides, which may obtain more accurate results, is required. 본 연구에서는 shade guide를 이용하여 치아의 색상을 결정하는데 있어 shade guide의 형태가 미치는 영향을 평가 하기 위해 시행하였다 8가지 서로 다른 색상 code (Al, A2, Bl, B2, B3, C2, C3, D3)를 사용하는 광중합 복합레진 (Esthet-X, Dentsply, USA)을 이용하여 각 색상마다 상악 중절치 모형, 치아형 shade guide, 도넛형 shade guide, 및 회색 shield를 포함하는 shade guide를 제작하고 무작위로 기호를 부여하였다. 제작된 치아 모형을 배열하고 전남 대학교병원 치과 진료처에 근무하는 19명의 수련의와 전남대학교 치과대학 2, 3학년 학생 65명을 대상으로 회색 배경 판과 D_(65) 표준광 하에서 각 치아의 색상과 일치하는 shade guide를 선택하게 하였다. 연구 결과 Bl 색상은 실험에 적용한 3가지 형태의 모든 shade guide에서 약 95%의 가장 높은 정확도를 보였으며 , 색상간 색차가 가장 적은 B2와 C2는 3가지 형태의 모든 shade guide에서 서로 비슷한 정도의 교차 선택율을 보였다. 또한 관찰자에 상관없이 치아 형태의 shade guide는 가장 높은 정확도를 보인 반면 (p < 0.05), 도넛 형태의 shade guide는 가장 낮은 정확도를 보였다 (p <0.05)
안동호 상류 운곡천의 이화학적 수질특성과 식물플랑크톤 군집 특성
이중복,이희무,이건주,박정원,박재충,김동걸,권기석 7개 국립대학교 환경연구 논문집 공동발행 위원회 2002 환경연구논문집 Vol.2 No.1
This investigation is about the characteristics of phytoplankton community and physciochemical water quality of specific 6-point the Woon-kog stream system in upsteam of the Andong Lake. DO value was showed over 8.1㎎/L at each site and COD_Mn, BOD, T-N, T-P tend to increase as they stream down and that the existence and dominance of phytoplankton was low and it was difficult to conclude the definite correlation of water quality and phytoplankton community. Finally, it seemed to be desirable that alternatives for pollutional reduction should be made and performed on the basis of the continuous monitoring of the inflow to preserve the Andong Lake.
제지폐수처리용 생물고분자응집제를 생산하는 Bacillus sp. K-111의 배양특성조사
권기석,손용호,최선택,정석관,송숙희,김동걸 7개 국립대학교 환경연구 논문집 공동발행 위원회 2002 환경연구논문집 Vol.2 No.1
Flocculant-producing microorganisms were screened from obtained strains in the laboratory using a pulp-wastewater treatment as the flocculating agent. K-111 strain that had high flocculating activity among them was selected and identified as Bacillus sp. K-111 16s rDNA sequencing. The favorable medium for the production of flocculant was glucose 1.5%, NH_4NO_3 0.2%, tryptone 0.01%, K_2HPO_4 0.08%, KH_2PO_4 0.06%, CaCO_3 0.03%, MgSO_4·7H_2O 0.005%, MnSO_4 0.005% in 1 liter of D.W. at initial pH 7.0. The optimum culture temperature and pH were 30℃ and pH 7.0, respectively. the flocculating activity was observed most highly after 36 to 48 hr of cultivation at the optimum conditions. the flocculating activity of produced biopolymer on optimum conditions was about 2.5-fold higher than that of screening medium.
β-Glucogallin isolated from Fusidium coccineum and its enhancement of skin barrier effects
Kim Hyoung-Geun,Kim Ki Sun,Kim Minji,Shin Sang-Hwan,Lee Yeong-Geun,Bang Myun-Ho,Lee Dong-Geol,Baek Nam-In 한국응용생명화학회 2020 Applied Biological Chemistry (Appl Biol Chem) Vol.63 No.6
Soil has been used for treatment of wound and skin diseases and for cosmetic purposes. Fusidium coccineum (FC) SA-1FC (Ascomycota) is a fungus found in nature, and its by-products are present in humid soils with plant humus. This study investigates the medium of fermented FC as a covering for all skin problems, including dryness, inflammation, and wounds. A preliminary study revealed that an alcohol extract of FC had a skin-enhancing effect, and thin-layer chromatography revealed a major component in a non-polar fraction. Here we identify a major compound isolated from a non-polar fraction as β-glucogallin. The mRNA levels of filaggrin and HAS3 are upregulated by FC and β-glucogallin treatment in keratinocytes and immortalized human keratinocytes cells. In addition, FC and β-glucogallin exert anti-inflammatory effects by suppressing expression of interleukin-4/poly(I:C)-induced chemokines and inflammatory cytokines. In fibroblasts, Hs68 cells, FC and β-glucogallin stimulate cell migration. These results suggest that FC and β-glucogallin can enhance skin barrier function.
Dong-Geol Lee,Donghoon Baek,Hansoul Kim,JoonHwan Kim,Dong-Soo Kwon 한국정밀공학회 2023 International Journal of Precision Engineering and Vol.24 No.1
The tendon-sheath mechanism can be applied to a flexible endoscopic surgery robot because of its flexibility and power transmission. However, the hysteresis, which is the inherent problem with this mechanism, affects the precision of the control of the surgical robot. Despite several studies that are aimed at tackling hysteresis, only a few literatures consider a practical circumstance such as initial unknown hysteresis, proper surgical procedure, and camera illumination. In this study, we propose a novel framework to reduce the hysteresis of a flexible surgical robot using the learning-based hysteresis classification and a feed-forward compensation based on practical scenarios. We empirically discretize and divide the hysteresis class based on its size and show the correlation between hysteresis and time-series wire tension experimentally to study its potential for use in real surgical robots. The results indicate that the hysteresis can be classified by utilizing the time-series wire tension data. Moreover, the proposed compensator could enhance the performance of a real-size flexible endoscopic surgery robot based on actual surgical environment.
Lactic Acid Recovery with Methane Production from Food Waste
Dong-Hoon Kim,Jeong-Geol Na,Mo-Kwon Lee,Mi-Sun Kim,Jae-Hyung Kim,Yong-Keun Chang,Wan-Taek Lim 한국폐기물자원순환학회 2013 한국폐기물자원순환학회 학술대회 Vol.2013 No.2
For the practical feasibility of lactic acid (LA) fermentation process, a continuous operation using mixed culture and the use of cheap and non-food raw materials are essential. In this study, a continuous LA fermentation of food waste was attempted using indigenous mixed culture. During the operation, temperature was gradually increased from 35℃ to 55℃, with showing the highest performance at 50℃. At 35-45℃, other organic acids such as acetic acid and butyric acid were also observed. At 50℃ and HRT 1.0 d, both LA production yield and its productivity were maximized to 1.8 mol LA/mol hexoseadded and 1.4 g LA/L/hr, respectively. A pyrosequencing result showed that Lactobacillus amylolyticus was the predominant species performing LA fermentation of food waste. The combined process of nanofiltration and water-splitting electrodialysis could recover highly purified LA from the fermentation broth by removing 95% of mineral ions and 77% of ammonium and glucose.
Biomimetic Micropatterning of Silica by Surface-Initiated Polymerization and Microcontact Printing
Kim, Dong ,Jin,Lee, Kyung-Bok,Lee, Tae ,Geol,Shon, Hyun ,Kyong,Kim, Wan-Joong,Paik, Hyun-jong,Choi, Insung ,S. WILEY-VCH Verlag 2005 Small Vol.1 No.10
<P>Micropatterns of silica on a gold substrate were generated by a biomimetic approach, namely, the biosilicification of silicic acids. The procedure consists of three simple steps: pattern generation of a polymerization initiator, (BrC(CH<SUB>3</SUB>)<SUB>2</SUB>COO(CH<SUB>2</SUB>)<SUB>11</SUB>S)<SUB>2</SUB>, by microcontact printing; surface-initiated, atom-transfer radical polymerization of 2-(dimethylamino)ethyl methacrylate (DMAEMA) from the patterned area; and polycondensation of silicic acids. The tertiary amine-containing polymer, pDMAEMA, aided in the spatially controlled polycondensation of silicic acids on surfaces in the presence of phosphate ions, and micropatterns of silica on a gold substrate were successfully generated in combination with the technique of microcontact printing. The procedure could be extended to the controlled fabrication of silica patterns with any size, shape, or thickness.</P> <B>Graphic Abstract</B> <P>A synthetic counterpart to silaffins in diatoms, pDMAEMA, was grown from a gold surface by pattern generation of a polymerization initiator and surface-initiated, atom-transfer radical polymerization. The patterns of pDMAEMA were utilized to generate patterns of silica on the surface by a biomimetic approach (see optical images). <img src='wiley_img/16136810-2005-1-10-SMLL200400157-content.gif' alt='wiley_img/16136810-2005-1-10-SMLL200400157-content'> </P>