• Proceedings of the KIEE Conference
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• 2006.07d
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• pp.1947-1948
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• 2006

본 논문에서는 컴퓨터로 정밀 계측기기들을 자동 제어하고 데이터를 측정하기 위하여 기존의 상용 프로그램을 사용하지 않고 Excel VBA(Visual Basic for Applications)를 이용하는 방법에 대하여 연구하였다. 이는 반복측정 및 통계적 수치계산 등에서 많은 장점을 지니고 있어 수많은 국가교정기관 및 일반 산업체에서 유용하게 사용될 수 있으리라 사료된다.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 1997.10a
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• pp.371-374
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• 1997

This study presents a new type of real-t~me CNC interpolator that is capable of generating cutter paths for ball-end milling of NURBS surfaces. The proposed surface interpolator comprises real-time algorithms for cutter-contact (CC) path scheduling and CC path interpolation. Especially, in this study, a new interpolator module to regulate cutting forces is developed. This proposed algorithm utilizes variable-feedrate commands according to the curvature of machined surfaces. The proposed interpolator is evaluated and compared with the conventional method based on constant feedrates through computer simulation.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 1996.11a
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• pp.555-559
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• 1996

Based on the general drill grinding mechanism, termed the helical grinding system, the conceptual design of 5 axes CNC drill grinding machine is proposed. Unique determination of the grinding parameters for precise production of the desired flank geometry is discussed by utilizing a mathematical model. Also, different combinations of grinding parameters are mentioned in order to produce various drill geometries (conical, cylindrical, and planar drill) on the single proposed CNC machine. A manual helical grinding machine has been fabricated and consequently helical drills have been ground in order to check the feasibility of the proposed grinding mechanism and its functionality.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.5 no.1
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• pp.29-33
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• 2004

In this paper, I'm tying to define the connection of the Device Characteristics and the Error Terms, and yield maximum estimated value of the mismatching errors by modeling the individual devices with signal-flow graph, and by seeking the transfer function of the system with the mismatching error in the combination of the devices using the Signal-flow Graph Gain Formula.

• Proceedings of the Korea Society for Simulation Conference
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• 2000.04a
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• pp.154-160
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• 2000

기형부위의 구조적 복합성으로 인하여 부상이나 질병을 진단하거나 치료계획을 수립하는데 있어 많은 어려움이 있다. 본 논문에서는 기형부위의 정량적 분석을 위한 시뮬레이션 시스템을 설계하고 구현하였다. 본 시뮬레이션 시스템은 기형부위간 관계를 정의하고 정량적으로 분석하기 위하여 2차원 진단영상들을 공간적으로 구성하여 가시화하고 단일 객체 및 다중 객체의 이동, 회전, 확대/축소, 컬러링 등과 같은 조작기능을 제공하며, 기형부위의 길이, 체적, 각도 등의 측정치를 제공한다. 본 시뮬레이션 시스템은 사용자가 작업부하량을 줄이기 위하여 클라이언트-서버 구조로 이루어졌으며, 시스템간 사용되는 메시지 처리를 위한 메시지 제어기, 기형부위별 가시화와 조작을 위한 기형가시화 및 조작기, 기형 부위의 수치적 분석을 위한 정량적 분석기, 그리고 각종 환자 정보를 위한 영상 데이터베이스 관리기로 구성된다. 본 시뮬레이션 시스템은 기형부위의 효과적인 가시화와 조작 뿐 아니라 정량적 분석치를 제공함으로써 보다 정확한 기형분석에 많은 도움을 줄 수 있으며, 범용의 데스크탑 컴퓨터상에서 편리한 사용자 인터페이스를 통하여 서버에 접속하여 시뮬레이션 시스템을 사용함으로써 보다 많은 사용자들이 동시에 사용할 수 있는 이점이 있다.

• Proceedings of the Korean Institute of Building Construction Conference
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• 2013.05a
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• pp.256-257
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• 2013

Roof and exterior wall of general formal buildings are designed and constructed through design focused exterior wall system and drainage and waterproof roof system. However, there are no classification of exterior wall and roof in freeform buildings and they are integrated as a surface of freeform buildings. Therefore it is necessary to develop the dry roof construction method using double skin roof system satisfying the design and function of the envelope. In this study, we have an effort to develop construction method of double-skin roof system using metal panel and PV.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.4 no.3
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• pp.27-42
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• 1984

The complexity and expensiveness of water resources projects have made optimum operation and design by computer-based techniques of increasing interest in recent years. Water resources problems in real world need many decisions under numerous constraints. In addition there are nonlinearities in the state and return function. This mathematical and technical troublesome must be overcome so that the optimum operation polices are determined. Then traditional dynamic optimization method encountered two major-cruxes: variable discretization and appearance of constraints. Even several recent methods which based on the Differential Dynamic Programming(DDP) have some difficulties in handling of constraints. This paper has presented New DDP which is applicable to multi-reservoir control. It is intended that the method suggested here is superior to abailable alternatives. This belief is supported by analysis and experiments(New DDT does not suffer course of dimensionality and requires no discretization and is able to handle easily all constraints nonlinearity).

• Journal of the Korea Institute of Building Construction
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• v.13 no.5
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• pp.434-440
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• 2013

Generally, the envelope of a freeform building is composed of a structure made with rectangular or C-shaped steel pipe, and steel or aluminum panel finishes on the structure. However, these construction methods increase material loss and cost and time. There are also numerous cases of misunderstanding of design and difficulties in construction, which frequently cause construction errors. Such construction errors decrease construction productivity, resulting in poor construction quality and the need for rework, as well as cost and time overruns. To solve the problem, this study proposes a 3D coordinate control technology for freeform structure implemented through a CNC(Computerized Numerical Control) Twisted tube method, and by extension, develops a BIM-based envelope construction method for freeform building.

• Journal of the Korean Institute of Intelligent Systems
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• v.12 no.2
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• pp.144-150
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• 2002

In this paper a design of neuro-fuzzy-based predictive controller for nonlinear systems with time-delay is proposed. The proposed control system contains two neuro-fuzzy systems called ANFIS(Adaptive Neuro-Fuzzy Inference System). One is run as a series-parallel mode and the other is run as a parallel mode. An ANFIS running in series-parallel mode emulates the response of the nonlinear system with time-delay. Another ANFIS running in parallel mode generates the predicted output of the nonlinear system to compensate for the time-delays. Therefore, the proposed control system can be thought of as an extension of Smith-predictor scheme to the nonlinear systems with time-delay. A detailed design Procedure is presented and finally computer simulations are executed for the effectiveness of the proposed control scheme.

• Journal of Korean Society of Coastal and Ocean Engineers
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• v.5 no.4
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• pp.329-337
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• 1993

It has been acknowledged as an important problem to maintain identity or compatibility among experimental laboratory data obtained separately in different wave flumes. The data quality mainly depends on how long the target waves can be realized in a flume without distortions. In the present paper a control circuit is devised in the form of multiple feed-back operations to attain a complete equality of the intended waves and the realized waves. The analysis of the circuit gives an algorithm which can be easily adapted to a small computer controlling wave making hardwares. As a main feature of the algorithm, a numerical filter with wave absorbing capability is presented. The filter is discretely realized so that the discrete input matches to the output directly, hence applicable even to nondeterministic input Through several example analyses, the algorithm proved its accuracy, being effective to both regular and irregular reflected waves.