• 제목/요약/키워드: magnification

검색결과 689건 처리시간 0.029초

Evaluation of marginal discrepancy of pressable ceramic veneer fabricated using CAD/CAM system: Additive and subtractive manufacturing

  • Kang, Seen-Young;Lee, Ha-Na;Kim, Ji-Hwan;Kim, Woong-Chul
    • The Journal of Advanced Prosthodontics
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    • 제10권5호
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    • pp.347-353
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    • 2018
  • PURPOSE. The purpose of this study was to evaluate the marginal discrepancy of heat-pressed ceramic veneers manufactured using a CAD/CAM system. MATERIALS AND METHODS. The ceramic veneers for the abutment of a maxillary left central incisor were designed using a CAD/CAM software program. Ten veneers using a microstereolithography apparatus (AM group), ten veneers using a five-axis milling machine (SM group), and ten veneers using a traditional free-hand wax technique (TW group) were prepared according to the respective manufacturing method. The ceramic veneers were also fabricated using a heat-press technique, and a silicone replica was used to measure their marginal discrepancy. The marginal discrepancies were measured using a digital microscope (${\times}160$ magnification). The data were analyzed using a nonparametric Kruskal-Wallis H test. Finally, post-hoc comparisons were conducted using Bonferroni-corrected Mann-Whitney U tests (${\alpha}=.05$). RESULTS. The $mean{\pm}SD$ of the total marginal discrepancy was $99.68{\pm}28.01{\mu}m$ for the AM group, $76.60{\pm}28.76{\mu}m$ for the SM group, and $83.08{\pm}39.74{\mu}m$ for the TW group. There were significant differences in the total marginal discrepancies of the ceramic veneers (P<.05). CONCLUSION. The SM group showed a better fit than the AM and TW groups. However, all values were within the clinical tolerance. Therefore, CAD/CAM manufacturing methods can replace the traditional free-hand wax technique.

Immunohistochemical Evaluation of Glucose Transporter Type 1 in Epithelial Dysplasia and Oral Squamous Cell Carcinoma

  • Pereira, Karuza Maria Alves;Feitosa, Sthefane Gomes;Lima, Ana Thayssa Tomaz;Luna, Ealber Carvalho Macedo;Cavalcante, Roberta Barroso;Lima, Kenio Costa de;Chaves, Filipe Nobre;Costa, Fabio Wildson Gurgel
    • Asian Pacific Journal of Cancer Prevention
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    • 제17권1호
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    • pp.147-151
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    • 2016
  • Oral squamous cell carcinoma (OSCC) is the most common malignancy of the oral cavity and some of these have been documented in association or preceded by oral epithelial dysplasia (OED). Aggressive cancers with fast growth have demonstrated overexpression of some glucose transporters (GLUTs). Thus, the aim of this study was to analyze the immunohistochemical expression of the glucose transporter, GLUT-1, in OEDs and OSCCs, seeking to better elucidate the biological behavior of neoplasias. Fifteen cases were selected this research of both lesions. Five areas were analyzed from each case by counting the percentage of positive cells at 400x magnification. Immunoreactivity of GLUT-1 was observed in 100% of the samples ranging from 54.2% to 86.2% for the OSCC and 73.9% to 97.4% for the OED. Statistical test revealed that there was greater overexpression of GLUT-1 in OED than the OSCC (p=0.01). It is believed the high expression of GLUT-1 may reflect the involvement of GLUT-1 in early stages of oral carcinogenesis.

A Study of Queen Elizabeth I's Cinema Costumes Viewed from Her Portrait (초상화 복식을 중심으로 본 퀸 엘리자베스 1세의 영화 의상에 관한 연구)

  • Sung, Kwang Sook
    • Journal of the Korean Society of Costume
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    • 제62권8호
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    • pp.55-70
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    • 2012
  • In 16th century, during renaissance time, Britain's queen Elizabeth I, as a means to express her authority, had an exaggerated clothing styles and was the fashion leader of the time. Thus, through a media of Cinema, tried to find out the characteristics and different aspects of the history of clothing styles, of how they changed, ascertained, restored, and reappeared in the modern time. The research was based on the consideration of Elizabeth I's 33 portraits and her clothing styles; and the research is also from analysing the movies from 1937 to 2007, a total of 9 Cinema and 102 clothes. Movie costumes' most important mission is representing the cinema's timely and spatial background. Thus, it is inevitable that ascertaining and restoring Elizabeth I's portrait should be done. However, the movie costume has to show her dramatic lifestyle, dignity, absolute authority, and other visual images. In addition, the costume has to contribute in making artistic effect and thus the creativity of a designer to satisfy all these needs should be added. Based on the findings from the research, the characteristics of Elizabeth I's Cinema costume are first, ascertaining and restoring portraits, second, mixture of silhouette and detail depending on time period, third, partial change on clothing style design, fourth, emphasis of ruff collar, fifth, magnification colors, sixth, avoiding excessive swelling and decoration, and applying modern style on Protective costume. Thus, based on the research, creative design in Cinema clothing, plays an important part in the history of clothing design. I hope this research could work as a foundation reference for clothing design's history.

Meridional Circulations in a Sliced Cylinder (기울어진 회전 원판에 의한 원통형 용기내의 자오면 유동의 크기에 관한 연구)

  • KIM Jae Won;LIM Hong Sick
    • 한국전산유체공학회:학술대회논문집
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    • 한국전산유체공학회 1996년도 춘계 학술대회논문집
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    • pp.52-57
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    • 1996
  • Mixing is most important for developing an electric washer which transforms angular momentum from rotating solid wall to laundry clothes inside it. For magnification of this mixing effect, some inventions are introduced to washing machine system, i. e., washing plate, washing rod, and even for washing cap in a model of a Korean manufacture. However, the previous efforts show dissatisfaction up till now. In this paper, a triumph to enhance mixing effects to increase washing performance is presented and verified by numerical investigation. The present model to simulate a washing tub is the simple circular cylinder with two endwall disks which is completely filled with a viscous liquid. The present improvement is to change mounting position of a bottom disk of the model cylinder. Therefore, the aim of this work just proposes a new idea, which is numerically inspected, to a producer of washing machine, In detail, this invention is alternating the mounting position of a rotating bottom disk. Actually skewed pulsator is placed in steady of a flat disk, so the two endwall disks at top and bottom are not in parallel. The angle between an inclined bottom disk and the horizontal plane is fixed as 5 degree and physical domain to consider poses a sliced cylinder. Flow fields in both a right circular cylinder and the present improved model are fully depicted by numerical integration on a body fitted nonorthogonal regular uniform grid system. Numerical data to explain flow structure are plotted for understanding of the effects of the inclined disk. Also enhanced mixing effects by the inclined rotating disk are gauged by accurate numerical data used in this work.

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Adaptive Error Concealment Method Using Affine Transform in the Video Decoder (비디오 복호기에서의 어파인 변환을 이용한 적응적 에러은닉 기법)

  • Kim, Dong-Hyung;Kim, Seung-Jong
    • The Journal of Korean Institute of Communications and Information Sciences
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    • 제33권9C호
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    • pp.712-719
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    • 2008
  • Temporal error concealment indicates the algorithm that restores the lost video data using temporal correlation between previous frame and current frame with lost data. It can be categorized into the methods of block-based and pixel-based concealment. The proposed method in this paper is for pixel-based temporal error concealment using affine transform. It outperforms especially when the object or background in lost block has geometric transform which can be modeled using affine transform, that is, rotation, magnification, reduction, etc. Furthermore, in order to maintain good performance even though one or more motion vector represents the motion of different objects, we defines a cost function. According to cost from the cost function, the proposed method adopts affine error concealment adaptively. Simulation results show that the proposed method yields better performance up to 1.9 dB than the method embedded in reference software of H.264/AVC.

The Manufacturing Mechanism of Nano-some and Method of Capsulation of Kojic Acid and Kojic Dipalmitate with Hydrogenated Lecithin and Co-emulsifiers (Hydrogenated Lecithin 과 Co-emulsifier를 사용한 Nano-some의 제조 메커니즘과 Kojic Acid 및 Kojic Dipalmitate의 캡슐화 방법)

  • Kim, In-Young;Jae, Koo-Hwan;Lee, Joo-Dong
    • Journal of the Korean Applied Science and Technology
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    • 제17권4호
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    • pp.248-256
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    • 2000
  • We investigated the property of formation of mono-vesicle(designated nano-some) with using of the combined co-emulsifiers and phospholipid. Nano-some was prepared with hydrogenated lecithin(HL) and diethanolamine cetyl phosphate(DEA-CP) by swelling reaction. Kojic acid and kojic dipalmitate could be made stabilization by nano-some system using microfluidizer(MF). Nano-some has a good affinity to skin by means of this system. The composition was compounded by 2% of hydrogenated lecithin (phosphatidyl choline contained with 75%, 0.5% of DEA-CP and 0.5% of diglyceryl dioleate (DGDO). To make nano-some, several conditions of MF have to be considered as follows. The optimum pH was 6.0. The pressure was 10,000psi and passage temperature was at $306^{\circ}C$. The nano-some base was passed to homogenize continually 3 times through MF. The Particle size distributions of the vesicles were with in $57{\sim}75.7nm$(mean 66nm) by measuring the Zetasizer-3000. Zeta potential of vesicles with 3 times passage through MF was -24.8mV. Formations for nano-some vesicle certificated photograph by scanning electric magnification (SEM). Stability of nano-some was very good for 6months. The turbidity was very good transparency compared nano-some with liposome. It was formed the mono vesicle in the opposite direction to be formed the multi-lamellar vesicle of liposome.

RC Flat Plate Subject to Combined In-Plane Compressive and Out-of-Plane Floor Loads (면내 압축력 및 면외 바닥하중을 받는 플랫 플레이트 슬래브)

  • Park, Hong-Gun
    • Magazine of the Korea Concrete Institute
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    • 제11권1호
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    • pp.231-242
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    • 1999
  • This paper presents a numerical study on the flat plates in deep basements, subjected to out-of-plane floor load and in-plane compressive load due to soil and hydraulic lateral pressure. For nonlinear finite element analysis, a computer program addressing material and geometric nonlinearities is developed. The validity of the numerical model is established by comparison with existing experiments performed on plates simply supported on four edges. The flat plates to be studied are designed according to the Direct Design Method in Korean Building Code for Structural Concrete. Through numerical study on the effects of different load combinations and loading sequence, the load condition that governs the strength of the flat plates is determined. For the plates under the governing load condition, parametric studies are performed to investigate variations of the strength with reinforcement ratio, aspect ratio, concrete strength, and slenderness ratio. Based on the numerical results, the floor load magnification factor is proposed.

A STUDY OF THE MICROLEAKAGE AT THE POST AND CORE AND TOOTH INTERFACE (포스트 코아와 치근 계면에서의 미세누출에 관한 연구)

  • Shin, Ji-Cheol;Lee, Sun-Hyung;Yang, Jae-Ho;Chung, Hun-Young
    • The Journal of Korean Academy of Prosthodontics
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    • 제36권2호
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    • pp.366-378
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    • 1998
  • Post and core is used to restore endodontically treated teeth, and it is a very important part which supplies retention and support to the prosthesis. But occasionally, caries occured due to the microleakage at the post and core and tooth interface, the failure of prosthesis has happened. In this study, the microleakage of cast gold post and core, amalgam core, and composite resin core was investigated and compared. The coronal part of the extracted upper anterior teeth were removed and endodontically treated with conventional method. The teeth were divided into three groups. In group 1, cast gold post and core was cemented with resin cement and in group 2, ready-made post was cemented with resin cement and amalgam core was built. In group 3, ready-made post was cemented with resin cement and composite resin core was built. All specimens were thermocycled between $5^{\circ}C\;and\;55^{\circ}C$ with dwell time of 15 seconds, and immersed in 0.5% aqueous solution of basic fuchsin dye for 24 hours. After embedded in the epoxy resin, the specimens were sectioned longitudinally and observed with stereomicroscope with the magnification of 25. From the findings of this study, the following conclusions were obtained. 1. There was microleakage at the core/tooth interface of all specimens. 2. The microleakage of gold post and core was significantly less than those of the other two groups. 3. There was no significant difference between the microleakage of amalgam core and that of composite resin core.

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The anatomical study of internal mammary perforators (내유방혈관 관통지에 대한 해부학적 연구)

  • Lim, Sung Yoon;Song, Hyun Suk;Pae, Nam Suk;Park, Myong Chul
    • Archives of Plastic Surgery
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    • 제36권1호
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    • pp.24-28
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    • 2009
  • Purpose: As a recipient vessel, internal mammary vessels have many advantages for microvascular reconstruction of the breast. But the approach is time consuming and results in large morbidities. However, the perforating branches of the internal mammary vessels can be used to minimize such demerits. The purpose of this cadaver study is to clarify the location and diameter of the perforating branches of internal mammary vessels and to prove they are safe and reliable recipient vessels. Methods: We studied 11 formalin - fixed cadavers and dissected their anterior chests bilaterally. The chests were exposed using midline presternal incisions. We dissected and found all perforators at subfascial planes under loupe magnification. The number, external diameter, and the distance from the midline were measured. Result: The mean external diameter of the arterial perforators was 1.32 mm and the mean external diameter of the venous perforators was 1.48 mm. The largest arterial and venous perforators were most frequently found in the second intercostal space. The mean distance from the midline to the perforator was evaluated; the artery averaged 1.95 cm and the vein averaged 2.08 cm. Conclusion: This study will be helpful when using the internal mammary perforating vessels as a recipient vessel during breast reconstruction.

Comparative Study of the Standard Plaque Assay with Solid-overlay and Immunofocus Assay for Varicella-zoster Virus Titration (수두바이러스의 정량에 있어서 Solid-overlay Standard Plaque Assay와 Immunofocus Assay의 효용성 비교 연구)

  • Lee, Hwa-Kyung;Jeong, Yong-Seok
    • The Journal of Korean Society of Virology
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    • 제30권1호
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    • pp.61-70
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    • 2000
  • Standard plaque assay using agarose-overlay has long been used for titration of many infectious virus particle. Plaque assay for the titration of varicella-zoster virus and its live vaccine requires three intermittent agarose overlay to visualize plaques. Overall procedure of the assay takes at least nine days from virus inoculation and microbe contamination including fungi is frequently accompanied during incubation period. We studied whether an immunofocus assay in conjunction with peroxidase-mediated immunohistochemical reaction may replace the standard plaque assay for the virus titration by comparing the two methods. A linear relationship was observed between number of foci and virus dilution. The number of foci in a given dilution of virus appeared a little higher than counted plaques formed in standard plaque assay. Independent titration results obtained from two assay methods for a given dilution of virus demonstrated a strong correlation ($r^2=0.99$). Foci of virus infected cells as revealed by the enzyme reaction could be counted either 4 days post-infection (p.i.) under low magnification (40X) microscopy, or 6 days p.i. by naked eye observation. Larger size of cell cuture plate, virus adsorption at $35^{\circ}C$, and 10% FBS in diluent appeared to be better conditions for the assay. Immunofocus assay will be an effective and dependable titration method for varicella-zoster virus and its live vaccine in place of the standard plaque assay in respect to accuracy, costs, and experimental convenience.

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