• Title, Summary, Keyword: Material Mixing Method

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A Study on Linear Spectral Mixing Model for Hyperspectral Imagery with Geometric Method (기하학적 기법을 이용한 하이퍼스펙트럴 영상의 Linear Spectral Mixing모델에 관한 연구)

  • 장은석;김대성;김용일
    • Proceedings of the Korean Association of Geographic Inforamtion Studies Conference
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    • pp.23-29
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    • 2003
  • Detection in remotely sensed images can be conducted spatially, spectrally or both [2]. If the images have high spatial resolution, materials can be detected by using spatial and spectral information, unless we can't see the object embedded in a pixel. In this paper, we intend to solve the limit of spatial resolution by using the hyperspectral image which has high spectral resolution. Therefore, the Linear Spectral Mixing(LSM) Model which is sub-pixel detection algorithm is used to solve this problem. To find class Endmembers, we applied Geometric Model with MNF(Minimum Noise Fraction) transformation. From the result of sub-pixel detection algorithm, we can see the detection of water is satisfied and the object shape cannot be extracted but the possibility of material existence can be identified.

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Deposition Properties of Dredged Materials of Kun-Jang Industrial Complex (군산지역 준설토의 퇴적특성)

  • 한영철;송정락
    • Proceedings of the Korean Geotechical Society Conference
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    • pp.61-64
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    • 1992
  • Recently, by the lack of fill material, the dredg and fill(hydraulic fill) method is commonly used in reclamation projects. Hydraulic fill method dredges the soil and send it with water through the transportation pipe to the site. The intial state of the hydraulic fill material is accordingly the mixture of water and soil skeleton which settles with time forming a new soil layer. The properties of new soil layer is governed the size of the soil skeleton, the flow velocity of mixing water, salt concentration, the distance from the discharge pipe outlet, and other dredging conditions when settling process occur. In this study, the effects of gradation of derdged soil on the deposition properties (with emphasis on the optimum spacing of the discharge pipes) was investigated by field test. It was found that the soft fine graind soil was forme at 350m from the discharge pipe outlet when the dredged material was classified as CL, while the soft fine grained soil was not formed even at the distance farther than 400m from the diacharge pipe outlet when the dredged material was classified as SM.

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Application of In-Situ Mixing Hydration Accelerator on Polymer Modified Concrete for Bonded Concrete Overlay (접착식 콘크리트 덧씌우기를 위한 초속경화 첨가재 현장 혼합 폴리머 개질 콘크리트의 적용성 연구)

  • Kim, Young Kyu;Hong, Seong Jae;Lee, Seung Woo
    • International Journal of Highway Engineering
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    • v.17 no.3
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    • pp.85-95
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    • 2015
  • PURPOSES : Recently, bonded concrete overlay has been used as an alternative solution in concrete pavement rehabilitation since its material properties are similar to those of the existing concrete pavements. Deteriorated concrete pavements need rapid rehabilitation in order to prevent traffic jams on Korean expressways. Moreover, speedy and effective repair methods are required. Therefore, the use of bonded concrete overlay with ultra-rapid hardening cement has increased in an effort to reopen promptly the expressways in Korea. However, mobile mixer is required for ultra-rapid hardening cement concrete mixing in the construction site. The use of mobile mixer causes various disadvantages aforementioned such as limitation of the construction supply, open-air storage of mixing materials, increase in construction cost, and etc. In this study, therefore, hydration accelerator in-situ mixing on polymer modified concrete produced in concrete plant is attempted in order to avoid the disadvantages of existing bonded concrete overlay method using ultra-rapid hardening cement. METHODS : Bonded concrete overlay materials using ultra-rapid hardening cement should be meet all the requirements including structural characteristics, compatibility, durability for field application. Therefore, This study aimed to evaluate the application of hydration accelerator in-situ mixing on polymer modified concrete by evaluating structural characteristics, compatibility, durability and economic efficiency for bonded concrete overlay. RESULTS : Test results of structural characteristics showed that the compressive, flexural strength and bond strength were exceed 21MPa, 3.15MPa and 1.4MPa, respectively, which are the target strengths of four hours age for the purpose of prompt traffic reopening. In addition, tests of compatibility, such as drying shrinkage, coefficient of thermal expansion and modulus of elasticity, and durability (chloride ions penetration resistance, freezing-thawing resistance, scaling resistance, abrasion resistance and crack resistance), showed that the hydration accelerator in-situ mixing on polymer modified concrete were satisfied the required criteria. CONCLUSIONS : It was known that the hydration accelerator in-situ mixing on polymer modified concrete overlay method was applicable for bonded concrete overlay and was a good alternative method to substitute the existing bonded concrete overlay method since structural characteristics, compatibility, durability were satisfied the criteria and its economic efficiency was excellent compare to the existing bonded concrete overlay methods.

Mechanical properties by resin injection method of orthdontic acrylic resin (교정용 레진장치의 레진주입방법에 따른 기계적 특성)

  • Jo, Jeong-Ki
    • Journal of Digital Convergence
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    • v.18 no.4
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    • pp.341-346
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    • 2020
  • Polymethyl methacrylate (PMMA), a self-curing resin mainly used in removable orthodontic appliances, is an acrylic resin mainly used in the field of modern dentistry. As an advantage, it has been used for a long time as a material for orthodontic devices in dentistry due to its color and volume, tissue affinity, and stability. The production of PMMA can be divided into self-polymerization method and thermal polymerization method according to activation method. Self-curing resins have long been used as orthodontic devices. The resin injection method is largely divided into a sprinkle-on method and a mixing method. In this study, we intend to test the mechanical properties according to the resin injection method of the orthodontic device, such as strength, modulus of elasticity, and surface roughness. There was no significant difference in strength as a result of three-point bending strength test on rectangular specimens (1.4 × 3.0 × 19.0 mm) of orthodontic PMMA. There was also no significant difference in hardness. There was no significant difference in surface roughness. It was confirmed that the orthodontic PMMA had no significant difference in mechanical properties according to the resin injection method of the orthodontic device.

A Study on Mixing Expression Methods of Finish Materials for Visual Differentiation in Housing Space (주거공간의 시각적 차별화를 위한 마감재 혼합적 표현방법 연구)

  • Seo, Ji-Eun
    • Korean Institute of Interior Design Journal
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    • v.20 no.2
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    • pp.147-155
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    • 2011
  • The purpose of this study is to grope for plan methods through analyzing preferences on expression methods of materials for visual differentiation in hosing space. The results are as follows : First, we could know that finish material is the important element to make differential design in housing space. It is a effective method to use the color and material of finish materials. Second, we could find they preferred woods in materials and Y color, N9.5, bright and light in colors through grasping preference about types in material elements. The preferred texture is soft and the preferred patterns are solid and geometry. Third, it is a good method to mix materials which give us different season feeling, and to mix colors which are different tones to lead the differential design by materials in housing space. In case texture and patterns, what we mix similar things is the effective method. Fourth, preference of the expression method is manifested differently depending on the selected elements. so when we plan the housing, we have to consider that. lastly, I think this study will be a basic data on a study to differentiate the design of the residential space.

Professional Engineer Yard - The construction example of deep cement mixing method for the soil improvement of soft ground in sports center structure foundation work around the mouth of Nakdong River (기술사 마당 - 낙동강(洛東江)주변의 체육센터시설물기초 연약지반(軟弱地盤)처리를 위한 DCMM 시공사례)

  • Cho, Kyoo-Yung;Kim, Jin-Eok;Jeong, Byeong-Chan
    • Journal of the Korean Professional Engineers Association
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    • v.44 no.6
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    • pp.45-50
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    • 2011
  • As the Deep Cement Mixing Method is composed of drilled natural soft soil structure and injected cement slurry to be mix together in it, the nature of excavated ground is influenced directly to the application of constructability. Also the nature of in situ soil is the main material, the mix design and construction work plan should be established before the investigation of soil which is performed through the whole site confirm the soil parameter before construction. The nature of investigated soil and water level as should be performed accurately.

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Effect of Plasma Enhancement on the Al-doped ZnO Thin Film Synthesis by MOCVD (유기금속화학기상증착법에 의한 ZnO:Al 필름 합성에서 플라즈마 인가 효과)

  • Seomoon, Kyu
    • Journal of the Korean Solar Energy Society
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    • v.39 no.1
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    • pp.33-40
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    • 2019
  • Al-doped ZnO (AZO) thin films were synthesized on Si(100) wafers via plasma enhanced metal organic chemical vapor deposition (PE-MOCVD) method using diethyl zinc (DEZ) and N-methylpyrrolidine alane (MPA) as precursors. Effects of Al/Zn mixing ratio, plasma power on the surface morphology, crystal structure, and electrical property were investigated with SEM, XRD and 4-point probe measurement respectively. Growth rate of the film decreased slightly with increasing the Al/Zn mixing ratio, however electrical property was enhanced and resistivity of the film decreased greatly about 2 orders from $9.5{\times}10^{-1}$ to $8.0{\times}10^{-3}{\Omega}cm$ when the Al/Zn mixing ratio varied from 0 to 9 mol%. XRD analysis showed that the grain size increased with increasing the Al/Zn mixing ratio. Growth rate and electrical property were enhanced in a mild plasma condition. Resistivity of AZO film decreased down to $7.0{\times}10^{-4}{\Omega}cm$ at an indirect plasma of 100 W condition which was enough value to use for the transparent conducting oxide (TCO) material.

Effect of Graphite Mixing Method on Electrode Characteristics in Cathode Resynthesis of Lithium Battery (리튬전지(電池) 양극(陽極) 재합성시(再合成時) 흑연(黑鉛) 도전재(導電材) 혼합방법(混合方法)이 전극특성(電極特性)에 미치는 영향(影響))

  • Lee, Churl-Kyoung;Kim, Tae-Hyun
    • Journal of the Korean Institute of Resources Recycling
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    • v.19 no.1
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    • pp.27-32
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    • 2010
  • To improve electronic conductivity of cathodic active materials of lithium ion battery, carbonaceous materials is usually added. New mixing method of abrasive milling has been investigated in mixing of graphite and $LiCoO_2$ powders. It would be expected that uniform mixing of graphite reduces capacity fading of cathode of lithium battery. Abrasion milled $LiCoO_2$ composite showed the best electrochemical performance as a cathode material with 1 wt% of graphite content, 300 rpm of milling speed, and 10 min of milling time. The improvement of the electrochemical performances such as cycleability and charge/discharge capacity retention would be mainly attributed to increase of the electronic conductivity and/or prevention of the active materials by uniform dispersion and coating of graphite on $LiCoO_2$.

A Case Study on the Test Execution for DCM using Vietnam CFBC Fly Ash Solidification Material (베트남 순환유동층 발전(CFBC) 플라이애시 고화재를 사용한 심층혼합 처리공법(DCM) 시험시공 사례)

  • Kim, Keeseok;Lee, Dongwon;Lee, Jaewon;Kwon, Yongkyu;Yu, Jihyung;Hoang, Truong Xuan;Jung, Chanmuk;Min, Kyongnam
    • Journal of the Korean Institute of Resources Recycling
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    • v.27 no.5
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    • pp.38-48
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    • 2018
  • Deep cement mixing method (DCM) is used to improve the quality of various ground type and its technical development proceeding based on performance improvements of solidification materials and mixing techniques with ground soil. In this study, it was possible to improve silty clay ground soil had 1 to 3 MPa compressive strength using solidification material that composed mainly circulating fluidized bed combustion (CFBC) power plant fly ash and reduce standard deviation of strengths from over 1.0 MPa to 0.322 MPa using improved auger bits in field test to forming more uniform bulbs than in case of using existing auger bit.

A Study on the Ground Reinforcement and Impermeable Effect by McG (McG(맥) 주입공법에 의한 지반보강 및 차수효과에 관한 연구)

  • Chun, Byung-Sik;Jung, Jong-Ju;Chung, Chang-Hee;Do, Kyung-Yang;Do, Jong-Nam
    • Proceedings of the Korean Geotechical Society Conference
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    • pp.352-361
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    • 2006
  • The grouting method is widely used in construction to reduce permeability and reinforce the ground. If the cement and grout material are not mixed well in the injection tip equipment, an opposite flow and Interception state of the chemical grouting can occur. McG method installs a special grouting device to allow better mixing of the grouting material and prevent backward flow. The block of nozzle also diversify powder rate of cement. YSS that lowers $Na_2O$ and thereby increases durability is developed by gel-forming reaction material. In this study, the seepage state and unconfined compressive strength of the injection material using the special injection tip equipment is tested. The results of laboratory and field tests clearly demonstrate that the strength increases and permeability decreases using the McG method.

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