• Title, Summary, Keyword: Ceramic Art

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The Types and Uses of Tableware China in the Latter Period of Chosun Dynasty (조선후기 백자식기의 종류와 쓰임새)

  • Lee, Eun-Wook;Yun, Yong-I;Lee, Jong-Mee
    • Journal of the Korean Society of Food Culture
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    • v.19 no.5
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    • pp.477-483
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    • 2004
  • The aim of this thesis is to study how tableware china has developed, on the basis of social and cultural changes, during the latter period of Chosun Dynasty. First, general sociological background of Chosun Dynasty has been reviewed. To examine the kinds of tableware china and their use during this period, this thesis is based on Asakawa Dakumis 'A ceramic ware of Chosun Dynasty' one of the most thorough references available in the field. Various antiques and remains of different periods were compared to study the changes in tableware china types and uses In conclusion, the development in food culture brought the changes in tableware china. Tableware china and food has developed together complementarily throughout the latter period of Chosun Dynasty.

Dental biomaterials for chairside CAD/CAM: State of the art

  • Lambert, Hugo;Durand, Jean-Cedric;Jacquot, Bruno;Fages, Michel
    • The Journal of Advanced Prosthodontics
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    • v.9 no.6
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    • pp.486-495
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    • 2017
  • The wide use of chairside CAD/CAM restorations has increased the diversity of the restorative material. For the practitioner, the selection of the appropriate material is difficult amongst the variety offered by the market. Information on the characteristics of the products can be difficult to assess due to the lack of up-to-date classification and the lack of reliability of manufacturer's advertising. The purpose of this article is to structure the data on restorative materials provided by various sources in order for the practitioner to choose the product most suited to the clinical situation. The objective is to classify chairside CAD/CAM materials and to define their characteristics and indications.

Flexure and tension tests of newly developed ceramic woven fabric/ceramic matrix composites (새로 개발된 세라믹 직포 보강 세라믹 기지 복합체의 인장 및 곡강도 시험)

  • Dong-Woo Shin;Jin-Sung Lee;Chang-Sung Lim
    • Journal of the Korean Crystal Growth and Crystal Technology
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    • v.6 no.1
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    • pp.73-87
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    • 1996
  • The mechanical properties of 2D ceramic composites fabricated bythe newly developed powder infiltration and subsequent multiple impregnation process were characterised by both 3-point flexure and tensile tests. These tests were performed with strain gauge and acoustic emission instrument. The woven fabric composites used for the test have the basic combinations of $Al_{2}$$O_{3}$ fabric/$Al_{2}$$O_{3}$ and SiC fabric (Tyranno)/SiC. Uniaxially aligned SiC fibre(Textron SCS-6)/SiC composites were also tested for comparison, The ultimate flexural strength and first-matrix cracking stress of SiC fabric/SiC composite with 73% of theoretical density were about 300 MPa and 77 MPa respectively. However, the ultimate tensile strengths of composite were generally one third of flexural strengths, and first-matrix cracking stress in a tension test was also much lower than the value obtained from flexure test. The lower mechanical properties measured by tension test were analysed quantitatively bythe differences in stressed volume using Weibull statistics. This showed that the ultimate strength and the firs-tmatrix cracking stress of woven laminate composites were mainly determined bythe gauge length of fibres and the stressed volume of matrix respectively. Incorporation of SiC whiskers into the matrix increased first-matrix cracking stress by increasing the matrix failure strain of composites.

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Research of Education Program for Autistic Children the Clay (흙 놀이를 통한 유아자폐증치료과정 연구)

  • Kim, Sung-Min
    • The Journal of the Korea Contents Association
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    • v.9 no.3
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    • pp.91-98
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    • 2009
  • The structure of modern society are complex, fast, overflowing of individualism and losing of independence through the standardization of human relationship. The frequency increased that children watch television and play computer game alone through this structure. Also, the mental disorder like as autism tend to be increase for childhood because, parents overprotect, unmethodical bringing up children, emotional disturbance and effect of genetic. Therefore, research and case study of art therapy publish that illustrates a tendency of developing and growing. On the base of this situation art therapy realize more important than before and gain power. Therefore, this research consider that clay therapy effect for autistic just children and investigate function of catharsis through the case study. Also, make study that social rappot and function of catharsis develop for children who has autism. The suggest effect of synergy which come from clay therapy(education of ceramic) and development of education program.

Advanced New Process Development of Two-Stage Swirl Calciner

  • Suh, Hyung-Suhk;Park, Choon-Keun;Ryu, Jae-Sang;Kwak, Hong-Bae
    • The Korean Journal of Ceramics
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    • v.5 no.3
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    • pp.296-302
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    • 1999
  • The state of the art of the 2-stage swirl calciner is to make 2-stage counter gas flow in a calciner with cooler hot air. Gas flow in the calciner increases retention time of raw mix particles. Simple structure of the 2-stage swirl calciner operated optimally the rotary cement kiln. In this study, in order to decide the entrance type of the cooler air of the optimal calciner model, an entrance cooler air velocity, the input points of raw mix were analyzed in many aspects with cold model experiment and computational fluidized dynamic simulation. It was found that the entrance type of cooler air fully splite 2-stage for the optimal condition of the cold model calciner. The operation conditions were that the input feeding, the cooler air velocity and the air velocity of throat were 0.33kg/$\textrm m$3$, 15m/s and 20m/s respectively. The performance of 150 t/d the pilot plant connected with the kiln rising duct was that volume capacity of the calciner is over 430 kg/$\textrm m$3$-h, decarbonation rate of raw mix apparently 90%, heat consumption 950 kcal/kg-cli and retention time of raw mix 2.4 sec. Its the best operating condition is cooler air velocity 18m/s, the gas velocity of throat 25m/s, feeding rate of raw mix 10t/h. The operating experience of the pilot plant confirmed the success of scale up for over 3000 t-cli/d.

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A Study on the Effect of Residual Stress between Body and Glaze of Pottery on the Mechanical Strength (도자기 소지와 유약의 잔류 응력이 기계적 강도에 미치는 영향에 관한 연구)

  • Lee, Jin-Ha;Na, Eun-Sang;Choe, Seong-Cheol
    • Korean Journal of Materials Research
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    • v.9 no.2
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    • pp.181-187
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    • 1999
  • In this study, the effect of residual stress on mechanical strength was investigated with 1 kind of whiteware body and 4 kinds of glazes which are produced in succeeding ceramic art place. Using dipping method, the body was coated for different times in order to manipulate the coating thickness and sintered in the different temperatures ($1200^{\circ}C$, $1250^{\circ}C$, $1300^{\circ}C$, $1350^{\circ}C$) for two thus hours. The sintered bodies were characterized by XRD, EPMA, FEM and UTM in order to study the forming of reaction layer between body and glazes, residual stresses and the effects of residual stresses on mechanical strength of pottery. At $1300{\circ}C$, we obtained maximum density and mechanical strength. By the finite element method, the residual stresses in surface of body were minimum in specific thickness of glazes and the mechanical strength of body in that thickness of glazes showed maximum when the firing temperature was settled.

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Bending, Vibration and Buckling Analysis of Functionally Graded Material Plates (점진기능재료(FGM) 판의 휨, 진동 및 좌굴 해석)

  • Lee, Won-Hong;Han, Sung-Cheon;Park, Weon-Tae
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.9 no.4
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    • pp.1043-1049
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    • 2008
  • In this paper, we investigate the static response. natural frequencies and buckling loads of functionally graded material (FGM) plates, using a Navier method. The eigenvalues of the FGM plates and shells are calculated by varying the volume fraction of the ceramic and metallic constituents using a sigmoid function, but their Poisson's ratios of the FGM plates and shells are assumed to be constant. The expressions of the membrane. bending and shear stiffness of FGM plates art more complicated combination of material properties than a homogeneous element. In order to validate the present solutions, the reference solutions of rectangular plates based on the classical theory are used. The various examples of composite and FGM structures are presented. The present results are in good agreement with the reference solutions.

Restoration of Excavated Earthenware in Seo Chun Oh Suk-li Site, Korea (서천 오석리유적 출토 토기복원)

  • Chung, Kwang-yong;Kang, Tae-chun;Lim, Se-jin
    • 보존과학연구
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    • pp.105-119
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    • 2007
  • Restoration of earthenware is largely composed of selection of clay, making(forming), and firing. This study lays emphasis on the making method and open-air firing. For making methods, This study used coiling method partly with priority given to ring method. The most significant feature of this restoration work is the making method of tap-forming, in which 외박자(out tap instrument) and 내박자(inter tap instrument) would be tapped and formed. For firing, This study used open-air firing method in the most primitive way. This method needs no special device and equipment and makes the work more simple and easy. The previous study was on the making method by archeological and preservation-scientific research but this study emphasized the restoration work in an actual earthenware maker's position. Through the result of this study, This study wish this would be an opportunity to present another model of various restoration methods for other researchers those who wanted to participate in the restoration and openair firing.

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Modified Adaptive Gaussian Filter for Removal of Salt and Pepper Noise

  • Li, Zuoyong;Tang, Kezong;Cheng, Yong;Chen, Xiaobo;Zhou, Chongbo
    • KSII Transactions on Internet and Information Systems (TIIS)
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    • v.9 no.8
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    • pp.2928-2947
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    • 2015
  • Adaptive Gaussian filter (AGF) is a recently developed switching filter to remove salt and pepper noise. AGF first directly identifies pixels of gray levels 0 and 255 as noise pixels, and then only restored noise pixels using a Gaussian filter with adaptive variance based on the estimated noise density. AGF usually achieves better denoising effect in comparison with other filters. However, AGF still fails to obtain good denoising effect on images with noise-free pixels of gray levels 0 and 255, due to its severe false alarm in its noise detection stage. To alleviate this issue, a modified version of AGF is proposed in this paper. Specifically, the proposed filter first performs noise detection via an image block based noise density estimation and sequential noise density guided rectification on the noise detection result of AGF. Then, a modified Gaussian filter with adaptive variance and window size is used to restore the detected noise pixels. The proposed filter has been extensively evaluated on two representative grayscale images and the Berkeley image dataset BSDS300 with 300 images. Experimental results showed that the proposed filter achieved better denoising effect over the state-of-the-art filters, especially on images with noise-free pixels of gray levels 0 and 255.

Review on the Recent Advances in Composite Based Highoutput Piezo-Triboelectric Energy Harvesters (압전-마찰전기 복합 소재 기반의 고출력 에너지 하베스팅 기술 개발 리뷰)

  • Rasheed, Aamir;Park, Hyunje;Sohn, Min Kyun;Lee, Tae Hyeong;Kang, Dae Joon
    • Ceramist
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    • v.23 no.1
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    • pp.54-88
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    • 2020
  • Global effort has resulted in tremendous progress with energy harvesters that extract mechanical energy from ambient sources, convert it to electrical energy, and use it for systems such as wrist watches, mobile electronic devices, wireless sensor nodes, health monitoring, and biosensors. However, harvesting a single energy source only still pauses a great challenge in driving sustainable and maintenance-free monitoring and sensing devices. Over the last few years, research on high-performance mechanical energy harvesters at the micro and nanoscale has been directed toward the development of hybrid devices that either aim to harvest mechanical energy in addition to other types of energies simultaneously or to exploit multiple mechanisms to more effectively harvest mechanical energy. Herein, we appraise the rational designs for multiple energy harvesting, specifically state-of-the-art hybrid mechanical energy harvesters that employ multiple piezoelectric and triboelectric mechanisms to efficiently harvest mechanical energy. We identify the critical material parameters and device design criteria that lead to high-performance hybrid mechanical energy harvesters. Finally, we address the future perspectives and remaining challenges in the field.