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낙하실험과 유한요소해석을 이용한 휴대폰용 Display 의 충격완화 Rubber 에 관한 연구
이배화(Bae-Hwa Lee),김경용(Kyeong -Yong Kim),강혜민(Hye-Min Kang),김명한(Myung-Han Kim),이용희(Yong-Hee Lee) 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.10
As the structure of a mobile phone becomes large and thin to catch up with a slim product trend, the reliability of a LCD module is on the rise as a big issue for a product design. To prevent cracking LCD, the impact resistance for mobile phones design is especially the primary consideration. As the method, shock absorbers such as rubber are inserted into the LCD structure. In this work, the shock absorb characteristics of rubber were examined by experimental and finite element method in the characterized condition as an environment for using a mobile phone. The ABAQUS/Explicit was used for finite element analysis as dynamic modulus. The impact absorbing ratio of the LCD rubber was studied order to compare the displacement curve of the test phone with the inserted rubber part.
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3D 프린터 빌드시트용 무용제 UV 경화형 아크릴 점착제의 제조
이배화 ( Bae Hwa Lee ),박동협 ( Dong Hyup Park ),김병직 ( Byung Jick Kim ) 한국접착및계면학회 2020 접착 및 계면 Vol.21 No.3
적층제조법 기반의 3D 프린팅 기술은 사용자가 원하는 상품을 출력하여 제공하지만 고온의 사용 환경 및 용융된 필라멘트 수지의 냉각 과정에서 변동적 수축현상이 발생하여 상품의 출력편차를 야기한다. 본 연구에서는 출력물의 들뜸과 뒤틀림을 방지하고 정밀한 형상의 고품질 출력물을 제작하기 위하여 3D 프린터 빌드시트용 아크릴 점착제를 연구하였다. 고온에서 점착특성이 유지되고 점착제로부터 출력물의 안착과 원활한 탈거를 위해 부착성과 강인성이 우수하고 높은 유리전이온도를 갖는 4-acryloylmorpholine (ACMO)를 첨가하여 무용제 타입의 점착제 조성물을 설계하였다. 단량체의 후첨가 방식을 사용하여 두 단계를 통해 아크릴 조성물을 합성하였고, 합성된 조성물로 코팅한 점착제 필름을 다각도에서 분석하였다. 그 결과 제조된 점착제는 높은 유리전이온도를 보이고 열처리 전/후에 따른 박리강도 차이가 보이지 않았으며, 유변학적 물성 분석을 통해 점착제의 우수한 접착력 뿐만 아니라 변형 없이 탈착이 가능한 물성을 갖음을 확인하였다. 본 연구에서 제조된 점착제를 3D 프린터의 빌드시트로 활용하였을 때 안착성 및 작업성이 양호하고 출력편차가 적은 출력물을 얻었다. 기존 판매중인 빌드시트와 비교하였을 때 본 연구에서 제조한 점착제 위에서는 출력물이 원활하게 탈거가 가능하기 때문에 FDM 방식 3D프린터의 사용자들에게 작업 편의성을 제공할 수 있을 것으로 기대된다. 3D printing technology enables proper objects to be made through an additive manufacturing method, but resulting in dimension deviation of the product due to contraction phenomenon as cooling melted filament resin injected from high-temperature use environment. In this research, we studied on acrylic adhesives for 3D printer build sheet in order to fabricate high-quality products with a precise shape and to well-mount without distortion. The solvent-free UV-curable acrylic adhesive formulation was designed by adding 4-acryloylmorpholine (ACMO) with high adhesion, toughness, glass transition temperature so that adhesion properties are stable at high temperature and products are easily mounted/detached from the adhesives. The designed formulation was polymerized through two-steps using post-addition of monomers. Using this, the acrylic adhesive was coated to make a film and then analyzed using various experimental techniques. As a result, the fabricated adhesive exhibited high glass transition temperature and there was little gap in peel strength before and after thermal treatment. Moreover, it was confirmed by rheological analysis that this adhesive can provide great bonding/debonding ability without distortion. We demonstrated the fabrication of a rectangular product using a 3D printing method using our acrylic adhesive as a build sheet. Mounting ability and workability were satisfactory and dimension deviation of the product was tiny. Because the product is easily detachable from the acrylic adhesive developed here than conventional build sheets, it is expected that this will provide work convenience to users who use the 3D printer.
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김근옥(Kun Ok Kim),김회춘(Hoi Choon Kim),이배화(Bae Hwa Lee),전진우(Jin Woo Jun),김병직(Byung Jik Kim) 한국위험물학회 2019 한국위험물학회지 Vol.7 No.1
This study suggests ways to identify and reduce the risk to the petrochemical industry in Yeosu. In particular, it has a higher density of facilities than other petrochemical industrial complexes. In addition, Jeonnam province has the highest number of "boundary" alarms issued by the Ministry of Employment and Labor"s Danger Warning System and is exposed to constant potential risk. However, the GIS Center does not have geographical information on outside pipelines of all tenants. Therefore, when new pipes are added or replaced, they are exposed to the risk of fire, explosion or leakage. To reduce the risk of Yeosu National Industrial Complex, divide the industrial complex into three sections and investigate the geographical information about the piping. In addition, the potential risk of Yeosu National Industrial Complex should be lowered by establishing a three-dimensional integrated piping management system based on the GIS center in connection with life pipelines outside the industrial complex in Yeosu.
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韓國傳統建築의 解析과 繼承을 爲한 創造的 『遺傳因子』에 關한 硏究
李培禾 울산대학교 1980 연구논문집 Vol.11 No.1
우리의 傳統建築에 있어서 샤아머니즘的 宗敎意識과 農經社會의 影響에 依하여 一定한 Pattern Language가 形成되었다. 文化人類學的으로 建築이 차지하고 있는 Pattern Language의 先驗的인 建築計劃의 原理는 첫째, 風水地理說에 依한 原理였으며 둘째, 生活慣習에 依한 態度와 社會位階的 空間構成·分割의 原理였다. 그러므로 傳統建築을 繼承하기 爲하여 그 原理의 構成困子 가운데 現代를 再創造할수 있는 GENOTYPE를 抽出해 내는 일이다. 즉 G₁; [김치] [깍두기] [된장찌개] 등의 語彙에 깃들어 있는 韓國의 土着的인 情趣와 같이 先人들의 抒情이 깃든 建築空間-[온돌] [내청마루] [�마루] [마당] [처마] [토방] [다락방] [벽장]의 原型的 Pattern Language를 Design Factors로서 現代建築에 表出시킨다. G₂: 外形的으로 追求된 風水地理의 建築的 原理를 形式論理로서 채택한다. G₃: 모듈·抽象的인 形態美學·平面構成의 妙·外部空間構成의 理 Religious feeling from shamanism and an agricultural economy society affected our traditional architecture to form a "Pattern Language" in ancient times. From the point of view of cutural anthropology, the Pattern Language has based on by the original properties, built up by arthitectural activities, and maintained by the transcendental principles of architectural design. These principles (1) have a kind of the symbolic theory through Pungsujirisul, (2) reflect the theory about the composition and arrangement of space determined by the hierarchy of social class consciousness and the rules of human settlements. In fact, these principles imply some eleiments {GENOTYPE] that are able to lead to the method for transmitting thus from generation to generation in Korea. G₁) Assumes the archetype of architectural spare in Korea i.e. Ondol·Daechung· Maru·Bygjang·Tobang·Toitmaru·Madang·chuma, as well as the feelings will be characterized in our minds of "Kimchi" "Kaccdugi" and so on. G₂) Assumes the architectural theory of pungsujirisul. G₃) Assumes Module, Form Gestaltung, Space Combination in Floor Plan and Exterior Space Design.
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