• 한국작물학회지
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• 제51권7호
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• pp.645-651
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• 2006

경북지역에서 브랜드 쌀로써 시판되는 쌀 21종류의 품질 특성과 미질과의 관계를 분석한 결과 단백질 함량이 낮을수록 식미치는 높았고, 수분함량이 낮은 품종의 쌀로 취반 하는 경우 밥의 덩어리진 정도에 대한 기호도가 높았다. 그리고 취반 밥의 색상에 대한 기호도는 완전립의 비율이 높을수록 좋았다. 단백질의 함량이 높은 쌀로 취반하는 경우 구수한 냄새에 대한 기호도가 높았으며, 수분함량이 높은 쌀로 취반하는 경우 씹힘성에 대한 기호도는 좋았다. 그리고 아밀로오스 함량이 낮은 품종의 쌀로 취반하는 경우 씹힘성에 대한 기호도는 좋았다.

• The Journal of Advanced Prosthodontics
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• 제6권1호
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• pp.8-13
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• 2014

PURPOSE. The purpose of this study was to evaluate whether surface treatments affect the translucency of laminate veneers with different shades and thicknesses. MATERIALS AND METHODS. A total of 224 disc-shaped ceramic veneers were prepared from A1, A3, HT (High Translucent) and HO (High Opaque) shades of IPS e.max Press (Ivoclar Vivadent) with 0.5 mm and 1.0 mm thicknesses. The ceramics were divided into four groups for surface treatments. Group C: no surface treatments; Group HF: etched with hydrofluoric acid; Group SB: sandblasted with 50-${\mu}m$ $Al_2O_3$; and Group L; irradiated with an Er;YAG laser. A translucent shade of resin cement (Rely X Veneer, 3M ESPE) was chosen for cementation. The color values of the veneers were measured with a colorimeter and translucency parameter (TP) values were calculated. A three-way ANOVA with interactions for TP values was performed and Bonferroni tests were used when appropriate (${\alpha}=0.05$). RESULTS. There were significant interactions between the surface treatments, ceramic shades and thicknesses (P=.001). For the 0.5-mm-thick specimens there were significant differences after the SB and L treatments. There was no significant difference between the HF and C treatments for any shades or thicknesses (P>.05). For the 1-mm-thick ceramics, there was only a significant difference between the L and C treatments for the HT shade ceramics (P=.01). There were also significant differences between the SB and C treatments except not for the HO shades (P=.768). CONCLUSION. The SB and L treatments caused laminate veneers to become more opaque; however, HF treatment did not affect the TP values. When the laminate veneers were thinner, both the shade of the ceramic and the SB and laser treatments had a greater effect on the TP values.

• 대한치과보존학회:학술대회논문집
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• 대한치과보존학회 2003년도 제120회 추계학술대회 제 5차 한ㆍ일 치과보존학회 공동학술대회
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• pp.623-623
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• 2003

I. Objectives The aim of this was to evaluate the use possibility of light curing flowable composite resins as a luting agent for translucent fiber posts. II. Materials and Methods 20 single-rooted maxillary central incisors were selected and crown was sectioned below the cemento-enamel junction to obtain a 13 mm ling root. Root canals were filed, cleaned, and shaped to ＃40 with K-file. Prepared canals were filled with gutta percha and AH26 root canal sealer by lateral condensation method. Teeth were than divided into 4 groups of 5 specimens each. In group 1 and 2, the canal space of each root was enlarged with ＃3 DT Light post preparation drill (Bisco, USA) to a depth of 9mm from the cervical.(omitted)

• 한국어류학회지
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• 제33권2호
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• pp.64-73
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• 2021

본 연구는 2015년 1월부터 12월까지 한국 주변해역에서 대형선망어업으로 어획된 고등어의 성장과 연령구조를 분석하였다. 연령분석을 위해 총 459개의 이석이 사용되었고, 가랑이체장의 범위는 19.6~46.0 cm였다. 연령은 투명대의 수, 채집일, 이석 가장자리 형태, 1월 1일의 명목생일에 대한 정보를 이용하여 판독하였다. 윤문은 고등어의 산란시기인 5월에 형성되었다. 연령은 0세부터 6세까지 추정되었고, von Bertalanffy 성장식은 성별 간 유의한 차이가 나타나지 않았다. 암컷과 수컷을 모두 합한 성장식은 FL_t=39.3×{1-exp[-0.90×(t+0.033)]}으로 도출되었다. 2015년 대형선망 어획물의 연령구조를 살펴본 결과, 2세군의 어획비율이 30.9%로 가장 높았고, 0~2세군은 전체 어획물의 88.5%로 대부분을 차지하였다.

• The Journal of Advanced Prosthodontics
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• 제14권5호
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• pp.285-293
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• 2022

PURPOSE. This study evaluated the relationship among translucency, crystalline phase, grain size, and fracture toughness of zirconia. MATERIALS AND METHODS. Four commercial zirconia - Prettau^®Anterior^® (PA), Prettau^® (P), InCorisZI (ZI), and InCorisTZI (TZI)- were selected for this study. The bar specimens were prepared to determine fracture toughness by using chevron notched beam method with four-point bending test. The grain size was evaluated by a mean linear intercept method using a scanning electron microscope. X-ray diffraction and Rietveld refinement were performed to evaluate the amount of tetragonal and cubic phases of zirconia. Contrast ratio (CR) was measured to investigate the level of translucency. RESULTS. PA had the lowest fracture toughness among other groups (P < .05). In addition, the mean fracture toughness of P was significantly less than that of ZI, but there was no difference compared with TZI. Regarding grain size measurement, PA had the largest average grain size among the groups. P obtained larger grain size than ZI and TZI (P < .05). However, there was no significant difference between ZI and TZI. Moreover, PA had the lowest CR value compared with the other groups (P < .05). This means PA was the most translucent material in this study. Rietveld refinement found that PA presented the greatest percentage of cubic phase, followed by TZI, ZI, and P, respectively. CONCLUSION. The different approaches are used by manufacturers to fabricate various types of translucent zirconia with different levels of translucency and mechanical properties, which should be concerned for material selection for successful clinical outcome.

• Restorative Dentistry and Endodontics
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• 제35권5호
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• pp.353-358
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• 2010

연구목적: 본 연구는 직접수복용 레진 (Filtek Z350, Supreme XT)과 기공용 레진 (Sinfony)으로 제작한 레진 인레이를 투과하는 광중합기의 광강도를 측정하고 레진 인레이를 구성하는 색조에 따라 투과되는 광강도를 측정하였다. 연구 재료 및 방법: A3 색조의 레진 인레이를 Z350 A3 한 가지 색조로 제작한 것과 Supreme XT A3B와 A3E 두 가지 색조로 제작한 것을 이용하였으며 Sinfony는 제조사의 지시에 따라 A3, E3, T1 세 가지 색조로 제작하였고 두께는 1.5 mm로 통일하였다. 할로겐 광중합기 (Optilux 360)와 LED 광중합기 (Elipar S10)를 이용하여 레진 인레이를 투과하는 광강도를 휴대용 광강도 측정기 (Cure Rite)로 측정하였다. 각 레진의 색조가 광강도의 투과에 미치는 영향을 분석하기 위해 0.5mm 두께로 레진 시편을 제작하여 광강도를 측정하였다. 결과: Z350 A3로 제작한 레진 인레이를 투과한 광강도가 가장 낮았으며, 다음으로 Supreme XT A3B와 A3E로 제작한 레진 인레이, 그리고 Sinfony A3, E3, T1으로 제작한 레진 인레이 순으로 광강도가 유의하게 증가하였다 (p < 0.05). 0.5mm의 레진 시편을 투과한 광강도를 측정한 결과 dentin shade인 Sinfony A3, Z350 A3, Supreme XT A3B가 가장 낮았으며, enamel shade인 Supreme XT A3E, Sinfony E3, 그리고 translucent shade인 Sinfony T1 순으로 유의하게 증가하였다 (p < 0.05). 결론: 레진 인레이를 제작할 경우 단색의 직접 수복용 레진을 사용하기 보다는 기공용 레진의 dentin shade, enamel shade, translucent shade를 모두 사용하는 것이 레진 인레이 하방으로 더 많은 중합광을 투과시킬 수 있는 것으로 사료된다.

• The Plant Pathology Journal
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• 제31권3호
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• pp.299-304
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• 2015

Interaction of the the rust fungus Puccinia miscanthi with the biofuel plant Miscanthus sinensis during the teliospore phase was investigated by light and electron microscopy. P. miscanthi telia were oval-shaped and present on both the adaxial and abaxial leaf surfaces. Teliospores were brown, one-septate (two-celled), and had pedicels attached to one end. Transmission electron microscopy revealed numerous electron-translucent lipid globules in the cytoplasm of teliospores. Extensive cell wall dissolution around hyphae was not observed in the host tissues beneath the telia. Hyphae were found between mesophyll cells in the leaf tissues as well as in host cells. Intracellular hyphae, possibly haustoria, possessed electron-dense fungal cell walls encased by an electron-transparent fibrillar extrahaustorial sheath that had an electron-dense extrahaustorial membrane. The infected host cells appeared to maintain their membrane-bound structures such as nuclei and chloroplasts. These results suggest that the rust fungus maintains its biotrophic phase with most mesophyll cells of M. sinensis. Such a nutritional mode would permit the rust fungus to obtain food reserves for transient growth in the course of host alteration.

• 한국식품과학회지
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• 제51권6호
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• pp.604-609
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• 2019

To control pathogenic E. coli in biofilm, bacteriophages were isolated from environmental samples. Seventeen isolates had depolymerase activities by translucent zones at the rims of plaques. To determine biofilm-forming ability, an abiotic plastic surface of polystyrene was used; E. coli O103 showed the highest biofilm formation at 30℃ after 24 h. Moreover, biofilm by E. coli O103 on the biotic surface of lettuce was observed by a scanning electron microscope. The bacteriophage cocktail of ΦNOECP40 and ΦNOECP44 showing depolymerase activities was prepared to eliminate the E. coli inbiofilm. By organic acids, reduction of E. coli in biofilm was insignificant and almost undetectable. However, the abundance of E. coli in biofilm was reduced by 3 log CFU/mL from 7.3 log CFU/mL after 60 min with the bacteriophage cocktail. Therefore, we suggest that bacteriophages with depolymerase could be utilized to effectively control pathogenic E. coli in biofilm.

• Bulletin of the Korean Chemical Society
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• 제23권11호
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• pp.1531-1540
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• 2002

With the invention of the inlaying technique for celadon in the latter half of the 12th century, the Koryo potters reached a new height of artistic and scientific achievement in ceramics chemical technology. Inlaid celadon shards, collected in 1991 during the surface investigation of Kangjin kilns found on the southwestern shore of South Korea, were imbedded in epoxy resin and polished for cross-section examination. Backscattered electron images were taken with an electron microprobe equipped with an energy dispersive spectrometer. The spectrometer was also used to determine the composition of micro-areas. Porcelain stone, weathered rock of quartz, mica, and feldspar composition were found to be the raw material for the body and important components in the glaze and white inlay. The close similarity between glaze and black inlay in the microstructure suggests that the glaze material was modified by adding clay with high iron content, such as biotite, for use as black inlay. The deep soft translucent quality of celadon glaze is brought about by its microstructure of bubbles, remnant and devitrified minerals, and the schlieren effect.

• 한국세라믹학회지
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• 제13권2호
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• pp.17-23
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• 1976

The study is an attempt to prepare the raw graze can replace the lead glaze that has been used for a long time as Korean Kimchi-jars. 1) The batch of the glaze that show the similar properties and appearance of lead-glaze were 40% of Yongin or Anseong Yakto, 40% of Ash and 20% of Anhydrous-Colemanite. It's Seger Formula was {0.86 CaO 0.02 MgO 0.12 KNaO} {0.26 Al2O3 0.0007 Fe2O3} 0.92 SiO2 0.3 B2O3 2) The firing temperature of selected glaze was 950-1050℃. 3) As the content of anhydrous-Colemanite was increased, the thermal expansion coefficient was decreased. 4) The color of leadless raw glaze was translucent light yellow. It was possible to obtain the same color as lead glaze by Fe2O3 and MnO2.