• 한국세라믹학회지
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• 제36권2호
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• pp.107-115
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• 1999

용융탄산염 연료전지(Molten Carbonate Fuel Cell)용 알루미나 화이버 강화 ${\gamma}$-LiAlO2 매트릭스의 적층방법에 따른 미세구조 변화 및 강도 증진 효과에 대하여 연구하였다. 테이프 캐스팅법으로 제조한 green sheet 2장을 45$^{\circ}C$에서 1kg/$ extrm{cm}^2$의 압력으로 1분간 hot pressing 하여 제조한 적층 매트릭스와 double casting 시 1단계 캐스팅한 green sheet를 3.5 시간 정도 건조한 뒤 2 단계 캐스팅 하여 제조한 적층 매트릭스의 기공율은 모두 50% 이상이었다. 알루미나 화이버 강화 적층 매트릭스의 강도는 비적층 매트릭스(115gf/$ extrm{mm}^2$)에 비해 70% 이상 증진되었으며 적층에 의해 화이버 배향성에 따른 강도의 편향성을 제거할 수 있었다. Triple casting에 의한 적층 메트릭스의 강도는 double casting 시에 비해 약간 증진되었으나 캐스팅 방향에 따른 강도의 편향성이 존재할 뿐만 아니라 기공율도 50% 이하였다. Double casting에 의한 적층 매트릭스의 강도 (195 gf/$\textrm{mm}^2$)는 hot pressing 하여 제조한 매트릭스 (212gf/$\textrm{mm}^2$)에 비해 약간 낮지만 MCFC 매트릭스 제조공정 면에서 double casting 법이 효율적인 적층공정으로 평가되었다.

• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2003년도 International Meeting on Information Display
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• pp.351-355
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• 2003

In this paper, a new barrier rib forming method of embossed barrier rib (EBR) formation process for the PDP rear panel was introduced. The process is mainly composed of green sheet fabrication, lamination of the green sheet on the rear glass panel having data electrodes, and roll embossing followed by firing. The EBR process has two advantages over the conventional barrier rib forming methods. One is the process requires less equipment investment than the conventional methods by about 20% of the current rear panel fabrication equipment investment owing to the simplified fabrication process. The other advantage is its reduced rear panel manufacturing cost by eliminating the time consuming and complicated processes and waste of materials in the conventional methods. In this study, general procedure of EBR fabrication process is described and the characteristics of prototype PDP using EBR panel are discussed.

• 한국진공학회:학술대회논문집
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• 한국진공학회 2014년도 제46회 동계 정기학술대회 초록집
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• pp.487.2-487.2
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• 2014

일반적으로 PV모듈은 태양전지의 내구성을 보완하기 위해 유리, EVA, Back-sheet, Frame등을 사용하여 보호하게 된다. 이렇게 하나의 PV모듈로 만들어져 약 20년간 옥외에 노출 되면서 다양한 하중에 노출된다. PV모듈의 변형이 발생하면서 PV모듈 내부에 위치하는 태양전지도 다양한 원인에 의해 외부에서 힘을 받음으로써 변형이 일어나고 심지어 태양전지의 파손이 발생 되는 경우도 있다. 따라서 PV모듈 내에 존재하는 태양전지가 외부하중에 의한 내구성을 확보하기 위해서는 유리, EVA, Frame과 같은 PV모듈 구성소재가 하중에 대한 변형량을 분석함으로써 태양전지 파손을 방지할 수 있는 구조 및 재료 연구에 활용 될 수 있을 것으로 판단된다. 이를 분석하기 위해 강화유리를 중심으로 EVA, 태양전지, Back-sheet의 적층화 과정에서 외부하중에 대한 변형량 비교와 강화유리, EVA 두께 변화에 따른 변형량, 라미네이션(Lamination)된 모듈과 프레임 사이의 접착력이 변형량에 어떤 영향을 미치는 확인하였다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2008년도 제39회 하계학술대회
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• pp.1100-1101
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• 2008

After lamination process, Isc is increased by sheet reflection. This paper presents the electrical output characteristics by back sheet reflection. The experiments was conducted by using single crystalline and multi crystalline PV module. The reflection area of single crystalline PV module is larger than multi one due to the difference of solar cell manufacturing. The experiments show that the increased performance ratio of single crystalline PV module output power is 1.55% rather than that of multi crystalline PV module output power is 1.13%. In addition, it is expected that the output power of single one rather than multi-one is increased by the lower temperature when the PV module is installed outside. The results can be reconsidered by the test material and test process. Back sheet used for humidity prevention makes PV module output power increasing.

• 한국정밀공학회지
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• 제19권2호
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• pp.87-94
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• 2002

Most of Rapid Prototyping (RP) process adopt a solid Computer Aided Design (CAD) model, slicing into thin layers of uniform, but not necessarily constant, thickness in the building direction. Each cross-sectional layer is successive1y deposited and at the same time, bonded onto the previous layers; the stacked layers form a physical part of the model. The objective of this study is to develop a method for calculating the rotation angle ($$\theta$_x, $\theta$_y$) of hotwire of the cutting system in the three-dimensional space for the Variable Lamination Manufacturing process using expandable polystyrene foam sheet (VLM-S). In order to examine the applicability of the developed method to VLM-S, various three-dimensional shapes. such as a screw, an extruded cross, and free surface bodies such as miniatures of the monkey(a figure of Sonokong), were made using the data obtained form the method.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2010년도 하계학술대회 논문집
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• pp.329-329
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• 2010

적층 액츄에이터는 우수한 압전특성 및 그 재료가 가진 고유한 특성 때문에 최근 이동통신 단말기용 햅틱 소자 및 PC 와 그 주변기기로 수요가 폭발적으로 증대되고 있으며, 향후에도 CATV 네트워크와 무선통신기기를 비롯한 디지털 통신분야로 응용분야가 확대되리라 예상된다. 적층 액츄에이터에서 발생되는 에너지는 세라믹 그린시트 두께와 전극 면적에 비례하여 변위 및 응력이 증가하게 되므로 고적층형에 대한 필요성이 증대되고 있다. 이러한 고적층 액츄에이터의 경우 소성과정에 서 warpage 및 de-lamination 같은 결함이 발생하기 쉬우므로 그린시트의 균일성 및 전극과의 matching성 확보가 중요한 요소이다. 본 연구에서는 슬러리의 분산성과 시트 내 유기물 함량 최적화 실험을 진행하여 적층 액츄에이터용 그린시트를 최적화 한 후 공정 적용성 및 저온소성 전극인 Ag-Pd 전극과의 매칭성을 확보하고자 하였다. 이러한 후막공정 기술 개선을 통해 적층 액츄에이터를 제조하여 압전 특성을 측정하였다.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2008년도 하계학술대회 논문집 Vol.9
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• pp.13-14
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• 2008

In this paper, we analyze the electrical characteristics of PV depending on distance among solar cells before and after lamination process. From the result, the PV module's maximum power increases about 3.37% when solar cells's distance is 10mm. And the maximum power increases up to 8.42% when solar cells's maximum distance is 50mm. It is assumed that PV module's surface temperature decreases because of increasing distance between solar cells that would give high power generation. Also, short distance between solar cell and frame result in contamination on glass. When considering reduced maximum power caused by contaminant, from that, we can fabricated PV module of lower cost with high performance.

• 한국CDE학회논문집
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• 제7권3호
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• pp.148-156
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• 2002

Most Rapid Prototyping (RP) processes adopt a solid Computer Aided Design (CAD) model, which will be sliced into thin layers of constant thickness in the building direction. Each cross-sectional layer is successively deposited and, simultaneously, bonded onto the previous layer; and eventually the stacked layers from a physical part of the model. A new RP process, the transfer-type Variable Lamination Manufacturing process using expandable polystyrene foam sheet (VLM-ST), has been developed to reduce building time and to improve the surface finish of parts with the thick layers and a sloping surface. This paper describes the generation of Unit Shape Layer (USL), the cutting path data of the linen. hotwire cutter for the VLM-ST process. USL is a three-dimensional layer with a thickness of more than 1 mm and a side slope, and it is the basic unit of cutting and building in the VLM-ST process. USL includes data such as layer thickness, positional coordinates, side angles of each layer, hotwire cutting speed, the heat input to the hotwire, and reference shape. The procedure of generating USL is as follows: (1)Generation of the mid-slice from the CAD model, (2)Conversion of the mid-slice into a simply connected domain, (3)Generation to the reference shape for the mid-slice, (4)Calculation of the rotation angle of the hotwire of the cutting system.

• 한국정밀공학회지
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• 제17권12호
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• pp.185-194
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• 2000

Rapid Prototyping(RP) techniques have their unique characteristics according to the working principles: stair-stepped surface of parts due to layer-by-layer stacking, low build speed caused by line-by-line solidification to build one layer, and additional post processing to improve surface roughness, so it is required very high cost to introduce and to maintain of RP apparatus. The objective of this study is to develop a new RP process, Variable Lamination Manufacturing using linear hotwire cutting technique and expandable polystyrene foam sheet as part material(VLM-S), and to investigate characteristics of part material, cutting characteristics by using linear hotwire cutting system and bonding. Experiments were carried out to investigate mechanical properties of part material such as anisotropy and directional tensile strength. In order to obtain optimal dimensional accuracy, surface roughness, and reduced cutting time, addition experiments were performed to find the relationship between cutting speed and cutting offset of hotwire, and heat generation of hotwire per unit length. So, adhesion strength tests according to ASTM test procedure showed that delamination did not occur at bonded area. Based on the data, a clover-shape was fabricated using unit shape part(USP) it is generated hotwire cutting. The results of present study have been reflected on the enhancement of the VLM-S process and apparatus.

• 한국정밀공학회지
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• 제18권8호
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• pp.54-63
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• 2001

Rapid Prototyping(RP) techniques have their unique characteristics according to the working principles: stair-stepped surface of a part due to layer-by-layer stacking, low build speed caused by point-by-point or line-by-line solidification to build one layer, and additional posts processing to improve surface roughness, so high cost is required to introduce and to maintain the RP apparatus. The objective of this study is to develop a new RP process, Variable Lamination Manufacturing by using expandable polystyrene foam sheet as part material(VLM-S), and to design an apparatus for implementation of the process. So, the process parameters and design criterions of the apparatus were defined and the techniques were proposed to satisfy the design criterion. Based on the results, a knob-shape, pyramid shape. and a solid block were fabricated on the apparatus in which unit shape part(USP) was generated for building each layer.