• Title, Summary, Keyword: pattern formation

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A Study on Pattern Formation of Ultra Definition Display Panel Applying Phosphoric Acid (인산을 적용한 Ultra Definition 디스플레이 패널의 패턴 형성에 관한 연구)

  • Kim, Min-Su;Cho, Ur Ryong
    • Journal of the Semiconductor & Display Technology
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    • v.13 no.3
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    • pp.13-19
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    • 2014
  • Phosphoric acid was used as etching agent instead of conventional peroxide - based chemicals for forming pattern of ultra definition display. Etchant was synthesized by mixing etching agent, oxidation agent, buffer solution, and additive into solvent, deionized water. Thicknesses of copper, main metal of ultra definition display, for etching, were 10,000 and $30,000{{\AA}}$. Etch stop of good low skew for proper pattern formation has been occurred at the content ratio of phosphoric acid 60 - 64%, nitric acid 4 - 5%, additive(potassium acetate) 1 - 3%. Buffer solution(acetic acid) decreased the metal contact angle $63.07^{\circ}$ to $42.49^{\circ}$ for benefiting pattern formation. Content variations on four components (phosphoric acid, nitric acid, acetic acid, potassium acetic acid) of the etchant with storage time were within 3 wt% after 24 hrs of etching work.

PATTERN FORMATION IN A GENERAL DEGN-HARRISON REACTION MODEL

  • Zhou, Jun
    • Bulletin of the Korean Mathematical Society
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    • v.54 no.2
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    • pp.655-666
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    • 2017
  • In this paper, we study the pattern formation to a general Degn-Harrison reaction model. We show Turing instability happens by analyzing the stability of the unique positive equilibrium with respect to the PDE model and the corresponding ODE model, which indicate the existence of the non-constant steady state solutions. We also show the existence periodic solutions of the PDE model and the ODE model by using Hopf bifurcation theory. Numerical simulations are presented to verify and illustrate the theoretical results.

Very Fine Photoresist Pattern Formation using Double Exposure of Optical Wafer Stepper (Optical Stepper의 이중노광에 의한 미세한 포토레지스트 패턴의 형성)

  • 양전욱;김봉렬;박철순;박형무
    • Journal of the Korean Institute of Telematics and Electronics A
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    • v.31A no.7
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    • pp.69-75
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    • 1994
  • A very fine pattern formation process using double exposure is investigated, which can overcome the resolution limit of optical wafer stepper. The very fine pattern can be obtained by moving the edge profile of large pattern by means of moving the stepper stage. The simulation results show that the light transmittance decrease bellow 9%, and the contrast increase to 16.6% for the 0.3$\mu$m photoresist pattern exposeed by the double exposure using i-line wafer stepper. And the experimental results show that fine photoresist pattern as short as 0.2$\mu$m can be obtained without a loss of photoresist thickness. Also, it proves that the depth of focus for 0.3$\mu$m pattern is longer than $1.5\mu$m. And, the very fine negative photoresist pattern was formmed by using the double exposure technique and the image reversal process.

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An Analysis of the Pattern and Formation of Corset Look on the Domestic Market (국내 시판 코르셋 룩의 패턴 및 구성 실태분석)

  • Jung, Hyun-Jung;Rha, Soo-Im
    • Journal of Fashion Business
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    • v.14 no.5
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    • pp.66-77
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    • 2010
  • This study aimed at examining the pattern and detailed formation of corset look which has established itself as a sort of fashion look as people began to wear underwear as part of outer garment. The study tried to present basic materials helpful for developing and creating the design and pattern of corset look. First, the collected corset look of each brand was copied and then developed. According to the result, corset look's representative silhouette turned out to be hourglass silhouette that tightened up the waist with an emphasis on expressing the beauty of the body. However, unlike corsets of the past, corsets today are being created with focus on the design rather than using lots of incision lines. Second, The bust girth of corset look items turned out to have little function to compress and deform the body like the corset of the past that was far smaller than the body. In addition, the corset style that used the lines of corset alone as motive turned out to have the larger waist girth. Third, the dismantling of collected corset look showed that the materials and formation features of corset look have become simple and that the simplification of corset look has made the items of corset look everyday clothes which can be worn practically and universally.

Mimicking the pattern formation of fruits and leaves using gel materials

  • Chen, Li;Zhang, Yang;Swaddiwudhipong, Somsak;Liu, Zishun
    • Structural Engineering and Mechanics
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    • v.50 no.5
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    • pp.575-588
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    • 2014
  • Gel materials have recently gained more attention due to its unique capability of large and reversible volumetric changes. This study explores the possibility of mimicking the pattern formation of certain natural fruits during their growing process and leaves during drying processes through the swelling and de-swelling of gel materials. This will hopefully provide certain technical explanations on the morphology of fruits and plants. We adopt the inhomogeneous field gel theory to predict the deformation configurations of gel structures to describe the morphology of natural fruits and plants. The growing processes of apple and capsicum are simulated by imposing appropriate boundary conditions and field loading via varying the chemical potential from their immature to mature stages. The drying processes of three types of leaves with different vein structures are also investigated. The simulations lead to promising results and demonstrate that pattern formation of fruits and plants may be described from mechanical perspective by the behavior of gel materials based on the inhomogeneous field theory.

Nash equilibrium-based geometric pattern formation control for nonholonomic mobile robots

  • Lee, Seung-Mok;Kim, Hanguen;Lee, Serin;Myung, Hyun
    • Advances in robotics research
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    • v.1 no.1
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    • pp.41-59
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    • 2014
  • This paper deals with the problem of steering a group of mobile robots along a reference path while maintaining a desired geometric formation. To solve this problem, the overall formation is decomposed into numerous geometric patterns composed of pairs of robots, and the state of the geometric patterns is defined. A control algorithm for the problem is proposed based on the Nash equilibrium strategies incorporating receding horizon control (RHC), also known as model predictive control (MPC). Each robot calculates a control input over a finite prediction horizon and transmits this control input to its neighbor. Considering the motion of the other robots in the prediction horizon, each robot calculates the optimal control strategy to achieve its goals: tracking a reference path and maintaining a desired formation. The performance of the proposed algorithm is validated using numerical simulations.

Developments of CAD System Package for Pattern Design Grading and Nesting (I) -Automatic Pattern Design - (의복 생산 공정 자동화를 위한 CAD System의 개발 (I) -자동 패턴 디자인-)

  • 박창규;정영진
    • Textile Science and Engineering
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    • v.28 no.3
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    • pp.51-58
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    • 1991
  • The objective of this research is to develop the CAD system package used by Personal computer for automatic Pattern designs, grading, and nesting, based on the mathematical and comp stational principles. The basic pattern designs of bodice, sleeve, skirt and slacks are obtained from the measurements of the physical data and manual input of the patterns. The former reduces the errors which are principally caused by user's skill and fence, but shows simple patterns. On the other hand the latter varies the pattern styles and modifications. The complete software package for drafting these patterns has been developed. Especially, two-dimentional curve formation is gained by numerical and computational theories for creating the smooth curves. Thus free curves of 2- D are easily gained without user's intervention. The techniques of dealing with the curve segments in 2- D are considered the characteristics of an individual body by the formation of the curves smoothly. This package of the computer programs is capable of drafting any Pattern designs and modifications required.

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Eco-printing Using Chitosan and Natural Colorants(2) (키토산과 천연색소를 이용한 Eco-Printing(제2보))

  • Kim, Chae-Yeon;Shin, Youn-Sook
    • Textile Coloration and Finishing
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    • v.23 no.3
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    • pp.169-178
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    • 2011
  • The purpose of this study is to develop eco-printing method using natural dyes combined with chitosan treatment to impart various pattern effect on cotton fabric. It was examined whether tone-on-tone pattern effects could be produced by screen printing with chitosan paste and subsequently dip-dyed in natural dye bath. For polychromic colorants, fabrics were pre-mordanted and then screen printed with chitosan, while only chitosan printing treatment was applied for monochromic colorants. Color, dye uptake, washing, light and rubbing fastnesses of printed fabrics were measured in relation to the presence of chitosan printing. Pre-mordanting and chitosan printing treatment were applied to such polychromic colorants as madder, sappanwood, onion and cochineal. Also, printing pattern formation on fabrics was evaluated by differences in dye uptake and color. The results suggested that madder, onion and cochineal were effective on pattern formation. Regarding sappanwood, since dye uptake was increased only by pre-mordanting without chitosan printing treatment, there was little color difference and thus patterns were not clearly distinguished. Chitosan printing treatment tended to increase washing, light and rubbing fastnesses of dyed fabrics with polychromic colorants. Chitosan printing treatment was applied to monochromic colorants such as chlorophyll, gardenia and indigo and the effect of printing formation was examined according to the difference in dye uptake. Among monochromic dyes tried, chlorophyll was effective and chitosan printing improved washing and light fastnesses.

Modulating Effect of Lupeol on the Expression Pattern of Apoptotic Markers in 7, 12-Dimethylbenz(a)anthracene Induced Oral Carcinogenesis

  • Manoharan, S.;Palanimuthu, D.;Baskaran, N.;Silvan, S.
    • Asian Pacific Journal of Cancer Prevention
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    • v.13 no.11
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    • pp.5753-5757
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    • 2012
  • Apoptosis, also known as cell suicide or programmed cell death, removes unwanted and genetically damaged cells from the body. Evasion of apoptosis is one of the major characteristic features of rapidly proliferating tumor cells. Chemopreventive agents inhibit or suppress tumor formation through apoptotic induction in target tissues. The aim of the present study was to investigate the pro-apoptotic potential of lupeol during 7,12-dimethylbenz(a) anthracene (DMBA) induced hamster buccal pouch carcinogenesis. Topical application of 0.5% DMBA three times a week for 14 weeks in the buccal pouches of golden Syrian hamsters resulted in oral squamous cell carcinoma. The expression pattern of apoptotic markers was analyzed using immunohistochemistry (p53, Bcl-2, Bax) and ELISA reader (caspase 3 and 9). In the present study, 100% tumor formation with defects in apoptotic markerexpression pattern was noticed in hamsters treated with DMBA alone. Oral administration of lupeol at a dose of 50mg/kg bw completely prevented the formation oral tumors as well as decreased the expression p53 and Bcl-2, while increasing the expression of Bax and the activities of caspase 3 and 9. The present study thus indicated that lupeol might inhibit DMBA-induced oral tumor formation through its pro-apoptotic potential in golden Syrian hamsters.

Plastein formation from sunflower seed protein (해바라기씨 단백질에서 plastein의 합성)

  • Rho, Jae-Mun;Kim, Ze-Uook
    • Applied Biological Chemistry
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    • v.34 no.1
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    • pp.1-7
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    • 1991
  • Optimum conditions for hydrolysis of sunflower seed by pepsin and for plastein formation by pepsin were determined. The optimum conditions for hydrolysis of sunflower seed were pH 1.5, $45^{\circ}C$, enzyme concentration 2%, substrate concentration 2%, and hydrolysis time 24hr. The optimum conditions for sunflower seed-plastein formation were 50% substrate, pH 4.5, $50^{\circ}C$, 0.25% pepsin and 18hrs reaction time. To verify plastein fromation from concentrated prptic hydrolysate of sunflower seed, thin layer chromatography was performed. The TLC pattern of concentrated peptic hydrolysate of sunflower seed was different from that of its plastein. The TLC pattern of concentrated peptic bydrolysate of sunflower seed and at of its plastein indicated that plastein was different material from the hydrolysate.

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