• Journal of the Korean Society of Marine Environment & Safety
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• v.19 no.5
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• pp.552-560
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• 2013

In this paper, an optimization algorithm for the block assembly accuracy control assessment is proposed with consideration for the current block assembly process and accuracy control procedure used in the shipbuilding site. The objective function of the proposed algorithm consists of root mean square error of the distances between design and measured data of the other control points with respect to a specific point of the whole control points. The control points are divided into two groups: points on the control line and the other points. The grouped data are used as criteria for determining the combination of 6 degrees of freedom in the registration process when constituting constraints and calculating objective function. The optimization algorithm is developed by using combination of the sampling method and the point to point relation based modified ICP algorithm which has an allowable error check procedure that makes sure that error between design and measured point is under allowable error. According to the results from the application of the proposed algorithm with the design and measured data of two blocks data which are verified and validated by an expert in the shipbuilding site, it implies that the choice of whole control points as target points for the accuracy calculation shows better results than that of the control points on the control line as target points for the accuracy of the calculation and the best optimized result can be acquired from the accuracy calculation with a fixed point on the control line as the reference point of the registration.

• Proceedings of the Korea Information Processing Society Conference
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• 2013.11a
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• pp.992-994
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• 2013

철강공정 가상공장 시스템은 조립공정과는 달리 연속공정의 특징을 가지며 공정과 자원의 배치가 아닌 공정을 구성하는 설비의 특성에 따라 제품이 결정되는 방식이다. 여러가지 설비의 모델들이 시뮬레이션 하며 서로 영향을 미치는데 이는 다중계층의 복잡한 모델 구조를 가지게 된다. 본 연구에서는 이의 해결을 위해 Descrete Event System 의 수학적 명세 방법론을 적용하여 복잡하고 계층구조적인 설비의 모델링을 쉽게 해결하기 위한 방법을 제시한다.

• The Magazine of the IEIE
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• v.9 no.4
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• pp.20-26
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• 1982

로보트에는 여러 가지 종류가 있다. 산업용 로보트를 한정하더라도 시퀸스형 로보트서부터 고급형 로보트라 불리는 플레이백형 로보트, 그리고 기계의 조립등을 맡아서 하는 지능 로보트에 이르기 까지 여러 종류의 로보트가 실용화 되어 있다. 따라서 이들의 제어방식도 다 다르다. 산업용 로보트 현황을 살피고 그 제어기술의 현황과 장래의 제어기술의 방향을 전망하여 보기로 한다.

• Journal of the korean Society of Automotive Engineers
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• v.19 no.1
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• pp.22-33
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• 1997

본 란에서는 우선 로봇을 이용한 공정자동화 관점에서 자동차 제조라인과 관련된 공정자동화를 가급적 구체적으로 거론코자 하였고 그 대상으로 가공, 조립 그리고 측정분야를 택하여 현황 및 필자의 관련 기술내용을 간략히 소개하였다. 여기서 소개된 기술은 공정이 다를 수 있어도 범용성을 가지며 계속 발전할 걸로 예상된다.

• The KIPS Transactions:PartD
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• v.14D no.2
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• pp.181-190
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• 2007

In component based development, component modeling for understanding and analyzing is the important part and is used to improve reusability. Generally, components are need to be divided into two types according to their usages, where the developer and assembler are usually different. To make a good component model, a complete component and interface specification for those components are needed. And the component model needs to adept two different views of developer and assembler. In this paper, we suggest two different views of component model that is related to views from developer and assembler, and we expand UML. Also we validate the efficiency of the suggested model by developing and applying a tool for building, managing and automatic transformation.

• Journal of Korean Society of Steel Construction
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• v.27 no.4
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• pp.411-422
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• 2015

The design and buckling behavior of earth retaining system supported by high strength steel pipe and PHC pile under compression is presented in this study. Buckling analysis of various strut system was investigated according to the strut total length(30m, 60m, 90m), three types of built-up columns and connection condition. Buckling loads calculated by F.E analysis was compared with the theoretical solution corresponding to diagonal buckling mode, local and global buckling mode of main strut. The design of the built-up column struts are performed based on design guide for high strength steel pipes and P-M diagram for built-up column with two PHC pile section.

• Polymer(Korea)
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• v.28 no.1
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• pp.3-9
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• 2004

Silane modified perfluoropolyethers (SPFPE) was synthesized as a self-assembled mono-layers (SAMs) thin film for micro-electro mechanical system (MEMS). SPFPE was compared to the Perfluoropolyethers (PFPE) as well as octadecyltrichlorosilane (OTS) and perfluorooctyltrichlorosilane (FOTS) with respect to the development of hydrophobicity in the SAMs surface. SPFPE shows less hydrophobicity than those of OTS and FOTS. Thermal annealing of SPFPE SAMs resulted in the enhancement of hydrophobicity as much as those of OTS and FOTS. The SAMs formed from SPFPE were found to be similar as OTS and FOTS SAMs with smooth R$\sub$a/ values of 0.3 nm. However, the flexible chain mobility of SPFPE resulted in 50% reduction as much as the fiction force in OTS.

• Transactions of the Korean Society of Mechanical Engineers A
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• v.31 no.9
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• pp.910-914
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• 2007

We present a simple and an inexpensive method for the fabrication of a nano-fluidic filter and a nano-pore micromixer using self-assembly of nano-spheres and surface tension. Colloid-plug was formed by surface tension of liquid in a microchannel to fabricate nanofluidic filter. When colloid is evaporated, nano-spheres in a colloid are orderly stacked by a capillary force. Orderly stacked nano-spheres form 3-D nano-mesh which can be used as a mesh structure of a fluidic filter. We used silica nano-sphere whose diameter is $567{\pm}85nm$, and silicon micro-channel of $50{\mu}m$-diameter. Fabricated nano-fluidic filter in a micro-channel has median pore diameter of 158nm which was in agreement with expected diameter of the nano-pore of $128{\pm}19nm$. A nano-pore micromixer consists of $200\;{\mu}m-wide,\;100\;{\mu}m-deep$ micro-channel and self-assembled nano-spheres. In the nano-pore micromixer, two different fluids had no sooner met together than two fluids begin to mix at wide region. From the experimental study, we completely apply self-assembly of nano-spheres to nano-fluidic devices.

• Journal of the Korea Society for Simulation
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• v.19 no.1
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• pp.1-11
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• 2010

K company produces semiconductor package products under the make-to-order policy to supply for domestic and foreign semiconductor manufacturing companies. Its production process is a machine-paced assembly line type, which consists of die sawing, assembly, and test. This paper suggests three plans to increase process throughput based on the process analysis of K company and evaluates them via a simulation model using a real data collected. The three plans are line balancing by adding machines to the bottleneck process, product group scheduling, and reallocation of the operators in non-bottleneck processes. The evaluation result shows the highest daily throughput increase of 17.3% with an effect of 2.8% reduction of due date violation when the three plans are applied together. Payback period for the mixed application of the three plans is obtained as 1.37 years.

• Proceedings of the Korea Association of Information Systems Conference
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• 2000.05a
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• pp.223-228
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• 2000

웹사이트는 정보 미디어와 애플리케이션 플랫폼을 가지고 널리 사용되어지고 있다. 작은 기업들이 큰 기업들과 경쟁하기 위해서 웹사이트 구축과 웹에 기반한 애플리케이션 개발이 절실히 요구되어지고 있다. 하지만, 대부분의 웹사이트 구축과 웹 애플리케이션의 생성은 체계적인 프로세스 없이 개발자들의 지식과 경험에 의존하여 임시직으로 개발되어 왔다. 따라서, 이러한 웹사이트 구축과 웹 애플리케이션 생성에 체계적인 프로세스를 가지는 소프트웨어 공학이 적용되어 개발, 유지되어져야 한다. 본 논문에서는 최근에 ActiveX, Java, ASP, CORBA등 다양한 형태의 코드와 플러그-인으로 개발되는 웹사이트와 웹 응용 애플리케이션에서 컴포넌트의 형태로 요소들을 구성, 접근하여 사용하고, 다른 웹사이트 구축이나 다른 웹 애플리케이션에서 이미 사용한 구성 성분을 재사용 함으로써 새로운 웹사이트 구축과 웹 애플리케이션 개발이 가능한 성분조립모델(the Component Assembly Model)을 웹사이트 개발 프로세스로써 활용하고자 한다.