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선박의 초기설계 제품정보관리를 위한 PLM 시스템 원형 개발
이찬우,이장현,이경호,이재범,김대석,서흥원,Lee, Chan-Woo,Lee, Jang-Hyun,Lee, Kyung-Ho,Lee, Jae-Beom,Kim, Dae-Seok,Seo, Heung-Won 한국전산구조공학회 2008 한국전산구조공학회논문집 Vol.21 No.6
최근의 제조 산업에서 제품개발 정보는 제품 수명주기 관리(PLM: Product Lifecycle Management) 시스템을 통하여 관리하고, 조달과 생산 계획에 관련된 통제는 전사적 자원관리(ERP: Enterprise Resource Planning), 생산 관리 시스템이 담당하고 있다. 특히, 효율적인 제품 개발과 시스템 구축 여부는 설계 및 생산, 원가 관리 전체에 걸쳐 영향을 미친다. 따라서 도면, 모델, 자재 정보 등 제품정보관리를 위한 PLM시스템의 역할이 매우 중요하게 여겨지고 있다. 이러한 PLM체계는 요구 사항 분석, 시스템 설계 그리고 기존 Data Migration 등 정보 시스템 개발 절차를 따라서 수행된다. PLM시스템은 전사적인 시스템 개발 과정에서 Prototype개발을 진행하여 구축 절차와 체계 설계를 검증하는 것이 효과적이다. 이 과정에서 PLM 아키텍처 및 제품 구조(Product Structure) 구성, PLM의 기능 개발을 수행한 후에 전체 시스템 설계 개발을 재 수행하는 것이 효과적이다. 본 연구에서는 조선 PLM구축에 필요한 절차와 체계 설계 방법을 제시하고, 이를 초기 기본 설계 단계에 적용하여 PLM구축 방법론을 제시하고자 한다. 초기 설계를 대상으로 요구사항을 도출하고, PLM의 아키텍처를 설계하였으며, 설계한 시스템을 Prototype형태로 제시하였다. Shipbuilding is a kind of ETO(Engineering To Order) industry which designs and produces a product in accordance to various requirement of customers, rules and regulations. Recently, the number of ordered ships has been increased by up to two or three times in each domestic shipyards. Most shipyards have been adopted 3D ship CAD, ERP(Enterprise Resource Planning) and APS(Advanced Planning System) to get an efficient product development and manufacturing system. However, not only the effective operation of 3D ship CAD, ERP and APS but also the production efficiency can be achieved only if product information management which can manages the product data is implemented in an integrated environment. Present study has suggested a systematic approach to implement a PLM system to manage the product data in early design shipbuilding. Also, a prototype of PLM is implemented to manage the product data in a basic ship-design. In the prototype system, a product structure and architecture of PLM is considered.
Poly(L-lactide)(PLLA)/Polyoxyethylene(POE) 블록공중합체의 약불방출담체에 관한응용
이찬우,임대우,전근,Lee, Chan-Woo,Ihm, Dae-Woo,Jun, Kun 한국섬유공학회 2000 한국섬유공학회지 Vol.37 No.9
An A-B-A block copoly(ester-ether) comprising poly(L-lactic acid)(PLLA, A) and poly (oxyethylene)(POE, B) was prepared by copolymerization. The release rate of the model drugs form PLLA/POE particles was studied by varying the hydrophilicity of the model drugs as well as that of the copolymers. It was observed that the rate of controlled release from the copolymer microspheres is not dependent on the degradation of the polymer, but on the wall permeability which is defined as the product of diffusion coefficient and the solubility coefficient. The release rate was fast as long as the hydrophilicity of the copolymer was high, regardless of the composition of the copolymer. It was also found that the release rate was faster as the monomer composition of the oxyethylene unit becomes higher.
FEM해석 기반 스퍼기어 펌프의 실험적 검증에 대한 연구
이찬우,김상유,이서한,김재열,임진혁,Lee, Chan-Woo,Kim, Sang-Yu,Lee, Seo-Han,Kim, Jae-Yeol,Lim, Jin-Hyuk 한국기계가공학회 2022 한국기계가공학회지 Vol.21 No.6
This work investigated the performance improvement of a medium-pressure fixed-displacement-type SPUR gear pump, which is mainly used in the machine tool industry. The 3D CFX analysis and IS technique were applied using ANSYS (commercial FEM code) and compared with experimental results to ensure the reliability of the analysis. In addition, the performance improvement of the pump was obtained using the theoretical volumetric displacement equation, and the gear tooth width was changed. The pressure flow performance curves were compared, and the results were analyzed according to the width of the gear teeth. This is a factor that can cause irregular flow, vibration, and noise inside the gear pump owing to friction between the housing and gear pump.
이찬우,김문겸,황학주,Lee, Chan Woo,Kim, Moon Kyum,Hwang, Hak Joo 대한토목학회 1993 대한토목학회논문집 Vol.13 No.5
본 연구에서는 강성기초의 동적응답을 얻기 위해서 비완화 경계조건(non-relaxed boundary condition)을 적용한 3차원 경계요소를 사용하였다. 경계요소는 장래의 비선형문제의 확장을 위해서 시간영역에서 형식화되었으며 기본해는 무한영역의 Stokes 해를 사용하였다. 본 연구는 검증되었으며 지반기초 및 임의 형상의 지하구조물외 동적응답을 얻는데 이용할 수 있다. In this work the dynamic response of 3-D arbitrarily shaped rigid massless foundation is numerically obtained using boundary element under non-relaxed boundary condition. The problem is formulated in time domain by the boundary element method. The fundamental solutions used in this work are the Stokes solutions of the three dimensional elastodynamics. This method has advantages over frequency domain techniques in that it provides in a natural and direct way the time history of the response and forms the basis for elct:ension to nonlinear problems. This work is verified and can be used for practical purpose.
이찬우 ( Lee Chan Woo ),윤현광 ( Yoon Hyun Kwang ),윤다애 ( Youn Da Ae ),김지현 ( Kim Ji Hyeon ),윤현도 ( Yun Hyun Do ) 한국구조물진단유지관리공학회 2018 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.22 No.2
This study was evaluated the penetration performance according to SPM type. The types of SPM are liquid and cream type. And the amounts of SPM were applied 0.13, 0.25, 0.36, and 0.51 kg/㎡. The specimen size wasφ100×30mm as KS F 4930. Test results indicated that the penetration depth of SPM were improved with increasing the amounts of application of liquid and cream SPM. In the case of applied cream SPM of 0.13, 0.25 and 0.36 kg/㎡ the standard deviation of penetration depth was less the liquid type SPM was applied.
2-(1,3,3-Trimethyl-6-azabicyclo[3,2,1]-oct-6-yl)-4,5-dihydro-1,3-oxazoline(TAO)의 개환이성화중합과 특성평가
이찬우(Chan Woo Lee),정진도(Jin Do Chung) 한국고분자학회 2012 폴리머 Vol.36 No.3
할로겐화알킬(PhCH2Br, PhCH2Cl, MeI)과 설폰산에스테르(MeOTf)를 개시제로 사용하여 100 oC, 24시간 의 반응조건으로 2-(1,3,3-trimethyl-6-azabicyclo[3,2,1]-oct-6-yl)-4,5-dihydro-1,3-oxazoline(TAO)의 중합을 실시, 개 시제에 의한 폴리머구조의 영향을 관찰한 결과, 양쪽 개시제 모두 거의 동일한 연쇄이동에서 나타나는 경향과 비슷한 결과를 얻었다. 그러나 개시제에 의한 폴리머의 구조는 설폰산에스테르계 개시제에서는 거의 100% pendant type 폴리머가 생성되는 반면, 할로겐화알킬계 개시제를 사용한 TAO중합은 pendant type 단위와 main chain type의 단위가 소량 생성됨이 확인되어 이것은 구핵성이 높은 할로겐 음이온에 의한 이중이성화중합이 부분적으로 진행되었음을 확인하였으며, 개시제로 Merrifield수지를 사용한 TAO와의 공중합에서는 다량의 단일 중합체가 부생되는 그래프트 공중합체가 생성되었다. 2-(1,3,3-Trimethyl-6-azabicyclo [3,2,1]-oct-6-yl)-4,5-dihydro-1,3-oxazoline (TAO) was polymerized at several conditions to clarify the influence of initiators, alkyl halide (PhCH2Br, PhCH2Cl, MeI) and sulfonate (MeOTf). The reactions were conducted at 100 oC for 24 h. The resultant polymer forms several kinds of structures with different combination of initiators. The sole MeOTf initiator caused chain transfer reaction to form the one-order structure for which the resultant polymer exclusively formed pendant structure, while alkyl halide and MeOTf formed two kinds of structures, pendant and main chain, which is caused by partly-proceeded double isomerization polymerization by highly reactive nucleophilic counter anion of halogen. Merrifield polymer was also utilized as an intiator and copolymerized with TAO, which produced a graft structure.