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- 저자 : 박경호 (검색결과 173 건)
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박경호 순천대학교 교육대학원 2019 국내석사
A dross removal robot, which is a facility to remove dross generated in galvanizing process, can reduce the workload of the workers in a tough working environment. However, the robot is often operated even though dross doesn't exist in the melting pot, since it is activated regularly by the pre-installed program. In the proposed method in this thesis, the existence of dross is determined by convolution neural network trained from the inception v3 model. The dross removal robot is activated when dross exists in the melting pot. Experimental results show that the existence of dross is successfully detected by the proposed technique It is expected that the unwanted operations of the dross removal robot will be considerably eliminated and the maintenance cost of the robot reduced by the proposed method
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최근 천연소재의 고갈로 인한 원자재 값 상승과 급속한 산업발전에 따라 국가 기간산업의 양적, 질적 확대로 인하여 국내 부지의 확보가 용이하지 않은 실정이다. 이에 효율적으로 토지를 이용하고자 그동안 건설부지로 고려치 않았던 느슨한 사질토나 연약한 실트질로 구성된 연약지반 개량 공법에 대한 관심이 상당히 높아지고 있다. 그리고 해외수주 등으로 중동지역에 많은 건설업체가 진출하고 있어 연약지반의 개량을 위한 새로운 공법 개발이나, 신소재의 개발이 필요하다. 본 연구에서는 새로운 메커니즘인 미생물을 연약지반에 교반하여 생장을 통해 탄산칼슘()을 생성함으로 흙 입자와 흙 입자 간의 공극을 채워줌으로서, 연약지반의 고결화(Cementation)를 일으키는 이른바 MCP(Microbial Calcite Precipitation)기술을 적용하여 연약지반의 강도를 살펴보았다. 본 연구에서 사용되어지는 미생물은 인체에 무해하며, 일반적으로 흙 속에 존재하는 미생물 균을 선정하여 연약지반의 강도를 개선하고, 친환경적인 재료를 사용하기 때문에 환경적인 측면에서도 긍정적인 효과를 나타낼 수 있도록 하는데 기여하고자 한다. Several studies have recently been conducted on the great potential of biological treatments for geotechnical applications, in particular for ground improvement. Microbial Calcite Precipitation(MCP) has been achieved using the microorganism Bacillus Pasteurii, an aerobic bacterium pervasive in natural soil deposits. The purpose of this thesis is to study the mechanism of cementation of soil induced by bacteria and strength improvement of soft ground. In order to understand the mechanism of cementation of soft soils treated with bacteria, six types of specimens(untreated, normal bacteria concentration treated, high bacteria concentration treated, supernatant high bacteria concentration treated, double high bacteria concentration treated, and 25% specimen high bacteria concentration treated) were made. Additionally, Scanning Electron Microscope(SEM) and X-ray Diffraction(XRD) analyses were performed for reaction mechanism analysis of materials, which allowed for the identification of crystal, shape, particle size, chemical formula and mineral components for each condition. In Scanning Electron Microscope(SEM), mineral has been found in the voids between the soil particles. Also, through X-ray Diffraction(XRD) analyses. This has been confirmed that microorganism may play an important role in the strength of soft ground.
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LCD switchable between reflective and transmissive mode is advanced structure having high aperture ratio compared with reflective LCD. However this structure needs double LC layers for grey level and mode switching respectively. By using double LC layer, reflective and transmissive mode LCD is generated many problems such as high thickness, heavy, and high cost. In particular, high thickness causes a parallax problem in operation of a reflective mode. To reduce the total thickness of the whole structure, we deposited both ITO and SiOx layers on polarizer, by which the glasses of top and bottom substrates are eliminated. When ITO is deposited on the polarizer in the room temperature, we found that polarizer was bended by cohesive force of ITO. To solve bending problem of polarizer in the process of ITO deposition, we deposited SiOx on the polarizer as the buffer layer. The SiOx layer having strong hardness can support cohesive force. The LC cell using polarizer substrate was manufactured. Then, the brightness, which is similar to one using glass substrate, was realized. As a result, we achieved mode-switchable reflective/transmissive LCD without parallax. In addition, thinner and lighter LCD was realized.
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3차원 CAD 뷰어 기반 대화형 PDF 문서 자동 생성 시스템
제품 개발에서 3D CAD의 도입이 증가하고 있으며 이러한 3D 데이터의 부서간 공유를 위하여여 PDM 및 뷰어 등의 시스템을 활용이 증가하고 있다. 표준 문서 포맷인 PDF는 3D 데이터의 공유 및 정보 교환을 목적으로 문서 내에서 3D 콘텐츠를 포함할 수 있도록 확장되었다. 이러한 PDF의 3D 기능을 엔지니어링 응용 분야에 활용하게 되면 부서 간 또는 협력사간 커뮤니케이션이 보다 명확해 질 수 있다. 본 연구에서는 상용 3D 뷰어와 같은 응용 프로그램에서 3D 데이터가 포함된 정형화된 엔지니어링 문서의 작성을 자동화하기 위한 시스템을 개발하였다. 시스템은 U3D 변환 모듈과 PDF 변환 모듈 2개의 모듈로 구성이 되었다. U3D 변환 모듈은 상용뷰어 시스템과 연계하여 뷰어상의 3D모델의 형상정보, 조립정보, 분해정보를 추출하여 U3D로 변환하는 모듈이다. PDF 변환 모듈은 뷰어로 부터 변환된 U3D 파일과 설계와 관련된 주석 정보, 사용자가 PDF 문서 내에서 조립체의 조립 및 분해 등의 조작을 직접 할 수 있도록 하는 자바스크립트를 PDF에 적용토록 하는 모듈이다. U3D 변환 모듈과 PDF 변환 모듈을 통하여 3D 데이터를 사용자가 직접 조작 가능한 대화형 PDF 문서를 자동으로 생성할 수 있다. PDF is widely accepted as a standard document format and now it supports 3D contents as well. Within the engineering application areas, this new 3D feature may be used to support sharing of 3D documents and thus collaboration between engineering departments, suppliers and partners. In this paper, we describe a system that automatically generates formatted engineering documents including 3D data converted from 3D applications such as commercial 3D CAD viewer. The system consists of two major modules. One is U3D conversion module and the other is PDF conversion module. U3D conversion module extracts geometry, view data, assembly and disassembly information from 3D viewer and converts to U3D format, currently in IDTF text file format. PDF conversion module generates a PDF file and inserts U3D data, various annotation information, and scripts for custom generated operations such as assembly and disassembly in the PDF document.
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The optical configurations of transflective LCDs using horizontal switching LC mode are proposed. The configuration of the reflective part is designed first, and then the transmissive parts are designed. There are two categories for designing the transflective LCD, one is mutually dependent configuration and the other is mutually in dependent configuration. In the dependent configuration, totally four kind of optical configuration for the transflective LCDs are proposed. Two kinds of configurations for transflective LCD using the mirror image method, other two kinds using the phase compensation method, a kind using a wide-band quarter wave layer are proposed and explained their switching prosperities on the Poin Care sphere. In the independent configuration, totally two kind of optical configuration for the transflective LCDs are proposed. With a multi-domain and a patterned retarder which consists of a quarter wave layer and an optical dummy layer, an optical configuration for the transflective LCD is proposed. Other optical configuration which don’t have a multi-domain but a patterned retarder is proposed. This configuration adopts the wide-band theory in both the transmissive part the reflective part. To reduce the parallax problem which may be produced by the quater wave layer, the inner-retarder is formed on the glass substrate. The formation codition is optimzed for its various thickness. A patterned retarder is also formed in a LC cell. The ion-beam alignment method is used. The pattern is achieved by exposing the ion-beam on the specified region. The proposed cofigurations are realized in the transflective IPS LCDs. The electrodes of the IPS LCDs are optimized to achieve a single gamma curve.
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