• Title/Summary/Keyword: case depth

Search Result 2,908, Processing Time 0.039 seconds

A study on the difference of Ceramic fracture strength according to the metal depth (금속의 두께가 도재의 파절강도에 미치는 영향)

  • Shin, Mu-Hak;Choi, Un-Jae;Kim, Yoong-Won
    • Journal of Technologic Dentistry
    • /
    • v.27 no.1
    • /
    • pp.89-95
    • /
    • 2005
  • In the manufacture of ceramo-metal crown, difference of fracture strength according to the metal depth has been known to be an important influence on enough intensity and internal stress to endure an occlusion-pressure as well as aesthetics of rehabilitating similar colour such as natural teeth. Depth of ceramic material could be determined by that of metal in three groups: first case of thin depth, second case of thick depth, and third case of constant depth. For the enhancement of the fracture strength between metal and ceramic materials and aesthetic satisfaction, a study on the bonding force, fracture strength, and aesthetics have been required more. In this study, therefore metal coping were made in three groups of A, B and C by using both ceramic powder of Norithe and metal of Columbium, which have been used primarily in the market. A group was made in $0.2mm\times10mm\times10mm$, B group was made in $0.4mm\times10mm\times10mm$, and, C group was made in $0.8mm\times10mm\times10mm$, respectively. The number of metal coping in each group was 10, and total sample numbers used in this study were 30 metal copings. After these metal coping tissue were in the process of build-up in 1.5mm constant depth of porcelain, firing, and glazing, the fracture strength about each metal coping tissue was investigated using oil press. It was found that the average values of durable occlusion pressure for separation of ceramic material in the porcelain fused to metal crown (PFM) in the each group showed the increasing order of A group (30 bar), B group (42 bar), and C group (44 bar), respectively. Proper depth of metal coping in the PFM was considered to be 0.4mm in the B group because this metal size showed higher durable property to the occlusion pressure and better coupling strength in the ceramo-metal crown.

  • PDF

Solving the Correspondence Problem by Multiple Stereo Image and Error Analysis of Computed Depth (다중 스테레오영상을 이용한 대응문제의 해결과 거리오차의 해석)

  • 이재웅;이진우;박광일
    • Transactions of the Korean Society of Mechanical Engineers
    • /
    • v.19 no.6
    • /
    • pp.1431-1438
    • /
    • 1995
  • In this paper, we present a multiple-view stereo matching method in case of moving in the direction of optical axis with stereo camera. Also we analyze the obtainable depth precision to show that multiple-view stereo increases the virtual baseline with single-view stereo. This method decides candidate points for correspondence in each image pair and then search for the correct combinations of correspondences among them using the geometrical consistency they must satisfy. Adantages of this method are capability in increasing the accuracy in matching by using the multiple stereo images and less computation due to local processing. This method computes 3-D depth by averaging the depth obtained in each multiple-view stereo. We show that the resulting depth has more precision than depth obtainable by each independent stereo when the position of image feature is uncertain due to image noise. This paper first defines a multipleview stereo agorithm in case of moving in the direction of optical axis with stereo camera and analyze the obtainable precision of computed depth. Then we represent the effect of removing the incorrect matching candidate and precision enhancement with experimental result.

A Study on Constructing Spatial Depth in San Carlo alle Quattro Fontane and Cappella di Santissima Sindone (산 카를로 알레 콰트로 폰타네와 산티시마 신도네에 적용된 공간적 깊이감 구축에 관한 연구)

  • Song, Ju-Young;Kim, Jong-Jin
    • Korean Institute of Interior Design Journal
    • /
    • v.17 no.6
    • /
    • pp.21-29
    • /
    • 2008
  • Baroque period was fundamentally different from the previous ages in terms of various aspects. Not only the social, economical, and cultural changes, but also ways of experiencing architectural space were essentially changed. Space in Baroque architecture was no more confined in the strict medieval order and proportions, but it became more flexible and dynamic by applying many interesting spatial concepts as well as design methods. That is why Baroque architecture somehow has been re-considered in the present time. Various contemporary architects and theorists attempt to apply ideas in the Baroque architecture to enhance and rich spatial experience. This thesis aims to study the methods of constructing spatial depth in some of Baroque architecture. First of all, theoretical research on the Baroque art in terms of depth expressions compared to the previous ages based on Heinrich $W{\ddot{o}}lfflin$ was mentioned. After explaining the general concepts and methods of spatial depth in Baroque architecture, two case buildings were selected to be further analyzed. They are San Carlo alle Quattro Fontane and Cappella di Santissima Sindone. They have unique ways of expressing the spatial depth in which people experience particular spatial feelings. Based on the case analysis, this study was concluded that the ideas as well as design methods for spatial depth can be applied in contemporary architectural designs in various ways.

A Study on the Case Hardning Depth of Tool Steel by YAG LASER (YAG 레이저에 의한 공구강의 표면경화 깊이에 관한 연구)

  • 옥철호
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
    • /
    • 1998.03a
    • /
    • pp.53-58
    • /
    • 1998
  • Case hardening of tool steel(SK5) was investigated after YAG laser irradiation. In the case of beam passes, martensite formed in the melt zone and in former pearlite regions of the austenization zone exhibited very high Vickers Hardness values. The molten depth and radius, micro structure, hardness were investigated as a function of defocusing distance, pulse width, and power density.

  • PDF

Predicting on Service Life of Concrete by Steel Corrosion (철근부식에 의한 육지 콘크리트의 수명예측)

  • 정우용;손영무;윤영수;이진용
    • Proceedings of the Korea Concrete Institute Conference
    • /
    • 2000.04a
    • /
    • pp.682-687
    • /
    • 2000
  • In this research the remaining service life of the concrete due to the steel corrosion was predicted by three cases; causing carbonation, using sea sand, using deicing salts. In case of deterioration by carbonation, effective carbonation depth, effective coverage depth and relative humidity are considered for predicting method. In case of using sea sand, predicting method is made of rust growth equation from polarization resistance method. In case of using deicing salts, predicting method is made of transformation of Fick's law. Three methods are very useful in predicting service life of concrete.

  • PDF

An Evaluation on a calculation the increased cost of construction according to the Depth change of Concrete Slabs in Apartment Building by executing the law of floor impact sound (공동주택 슬래브 두께변화에 따른 공사비 증가 산정 평가 - 바닥충격음 법제화 시행에 따른 표준바닥구조를 중심으로 -)

  • Lee, Won-Yeul;Jeong, Sang-Min;Shin, Duck
    • Journal of the Korea Institute of Building Construction
    • /
    • v.5 no.2 s.16
    • /
    • pp.161-166
    • /
    • 2005
  • This study is to evaluate on the increased cost of construction according to the depth change of concrete slabs in apartment building. When we increased the depth of concrete slab from 150mm to 180, 210mm, the qualitative and cost of construction were calculated by the high-rise type, the unit-size type. As a result of this study, in 32 Pyong type, increment of construction cost rate appeared by $5.1\%$ in case of increase from slab 150mm to 180mm, and $10.0\%$ in case of increase from slab 150mm to 210mm. In 45 Pyong type, Increment of construction cost rate appeared by $5.7\%$ in case of increase from slab 150mm to 180mm, and $10.2\%$ in case of increase from slab 150mm to 210mm. In 55 Pyong type, Increment of construction cost rate appeared by $2.4\%$ in case of increase from slab 150mm to 180mm, and $8.9\%$ in case of increase from slab 150mm to 210mm.

A Study on the Optimum Range of Space Depth for Hospital Architecture Planning Focused on System (체계중심병원건축계획을 위한 공간깊이의 적정범위에 관한 연구)

  • Kim, Eun Seok;Yang, Nae Won
    • Journal of The Korea Institute of Healthcare Architecture
    • /
    • v.22 no.4
    • /
    • pp.47-55
    • /
    • 2016
  • Purpose: Growth and change are the most important things in planning of hospital architecture. It is especially necessary for countless changes taken place since the hospital opens to be adapted to the planning of hospital architecture phase. The space depth in the hospital serves a very crucial role in accepting these changes. The purpose of this study is to provide basic data necessary to space depth planning to prepare for change through analyzing space depth's change in hospital architecture chronologically. Methods:: The method of this study is analyzing space depth's change in cases of 19 hospitals in total, from the 1980's, which is the quantitative growth period, until recently. Especially this study is analyzing Max & Min space depth focusing change of medical environment. Based on this, this study suggests an form of space depth and optimum range of space depth response to growth and change of hospital architecture. Results: The conclusions of this study are as follows. Considering these conclusion, double linear system is most appropriate for space depth for hospital architecture planning focused on system. Optimal range of space depth is at least 21.6m or more in case of clinic room and from 27 meter to 37meter in case of examination & treatment room. Implications: Space of Depth is a key element determining system for hospital architecture planning focused on system. The results of this paper can be data for planning system of hospital architecture which copes with the change.

Effects of Light-Weight Soil Mixture and Depth on the Three Native Plants in Extensive Roof Garden (옥상조경용 경량 토양의 혼합비와 토심이 3가지 자생초화류의 생육에 미치는 영향)

  • 김명회;방광자;주진희;한승원
    • Journal of the Korean Institute of Landscape Architecture
    • /
    • v.31 no.1
    • /
    • pp.101-107
    • /
    • 2003
  • Focusing on native plants that have a high possibility of being introduced as extensive rooftop material, this study was conducted to realize extensive and easy-to-manage rooftop gardens and to raise the utilization of native plants by verifying their growing response to soil media and depth. Its result is as follows: 1) In the case of Chrysanthemum zawadskii, the top growth was better in sandy loam than in P$_1$V$_1$P$_2$, and P$_1$V$_1$P$_3$, but the mortality rate was high, making it unsuitable soil. Regarding soil depth the mortality rate was lower in 10cm than in 5cm, and it grew well in 10cm. When using it for rooftop gardens, it would be desirable to keep the minimum viable soil depth over loom. 2) In the case of Sedium middendorffianum the mortality rate was 0% regardless of soil media and depth making it very suitable material for rooftop garden. Although the flowering rate was somewhat lower in P$_1$V$_1$P$_2$, and P$_1$V$_1$P$_3$ than in sandy loam, the mortality rate was low and the root growth was good. Therefore, provided that fertilizing is managed well, it is a plant that can be highly utilized. 3) In the case of Allium senescens, the mortality rate was 0% regardless of soil or soil depth, making it a very suitable plant for extensive rooftop gardens. Although top growth was poorer in P$_1$V$_1$P$_2$, and P$_1$V$_1$P$_3$than in sandy loam the root growth was good. Therefore, provided that fertilizing is managed well, it is a plant that can be highly utilized. In conclusion the study revealed that suitable species for extensive rooftop gardens are Sedium middendorffianum and Allium senescens. However, Chrysanthemum zawadskii can be utilized greatly when fertilizing is managed regularly in artificial mixed soil over l0cm.

Effect of Ion-nitriding on Fatigue Strength (피로강도에 미치는 이온실화처리의 영향)

  • Kang, Moo-Jin;Lee, Chung-Oh
    • Transactions of the Korean Society of Mechanical Engineers
    • /
    • v.3 no.3
    • /
    • pp.98-103
    • /
    • 1979
  • The fatigue limit of an ion-nitrided steel was investigated experimentally and analytically. It is found that fatigue limit can singificantly be increased by ion-nitriding, and that the case depth is the most important parameter which determines the fatigue limit. The data indicate that fatigue limit increases with the case depth as well as the surface hardness of the nitrided steel. The fracrographs of the fracture surfaces taken by a scanning electron microscope show that the fisch-eye is located at the subsurface of failed specimens. Assuming that crack propagates from the subsurface inclusions, an analytical model is proposed to predict the fatigue limit. Taking into account the stress distrbution of a nitrided specimen, fatigue limit is predicted as a function of the case depth. The proposed semiemprical formula agrees satisfactorily with the experimental data obtained from rotating beam fatigue testing.

The Effect of Alloy Elements on the Damping Capacity and Plasma Ion Nitriding Characteristic of Fe-Cr-Mn-X Alloys. [II Plasma Ion Nitriding Characteristic] (Fe-Cr-Mn-X계 합금의 감쇠능 및 플라즈마 이온 질화특성에 미치는 합금원소의 영향 [II플라즈마 이온 질화특성])

  • Son, D.U.;Lee, H.H.;Seong, J.H.;Park, K.S.;Kim, C.K.;Kang, C.Y.
    • Journal of Power System Engineering
    • /
    • v.9 no.1
    • /
    • pp.76-81
    • /
    • 2005
  • The effect of micro-pulse plasma nitriding temperature and time on the case thickness, hardness and nitride formation in the surface of Fe-12Cr-22Mn-X alloy with 3% Co and 1% Ti alloys elements investigated. External compound layer and internal diffusion layer was constituted in plasma nitride case of Fe-12Cr-22Mn-X alloys and formed nitride phase such as ${\gamma}'-Fe4N\;and\;{\varepsilon}-Fe2-3N$. Case depth increased with increasing the plasma nitriding temperature and time. Surface hardness of nitrided Fe-12Cr-22Mn-X alloys obtained the above value of Hv 1,600 and case depth obtained the above value of $45{\mu}m$ in Fe-12Cr-22Mn-3Co alloy and $60{\mu}m$ in Fe-12Cr-22Mn-1Ti alloy. Wear-resistance increased with increasing plasma nitriding time and showing the higher value in Fe-12Cr-22Mn-1Ti alloy than Fe-12Cr-22Mn-3Co alloy.

  • PDF