• 대한기계학회논문집A
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• 제35권12호
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• pp.1613-1618
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• 2011

기구 메커니즘의 작동해석과 관련하여 해석기하적 방법과 도식적 방법에 대한 연구가 있어왔다. 반면에 주어진 목적에 맞게끔 메커니즘을 구성하는 것에 대한 연구는 그리 많이 이루어지지 않았는데 일반 산업체 현장에서는 주로 과거에 활용된 메커니즘을 응용하는 방식으로 메커니즘 설계를 수행하여 왔다. 이런 방식은 설계초기 단계에서 가능한 모든 기구구성에 대해 숙고할 필요가 있는 메커니즘 설계자의 기구 선택범위를 제한하는 측면이 있다. 본 논문에서는 개념설계 단계에서 활용될 수 있는 기구 메커니즘 구성에 관한 새로운 방법론을 제시한다. 이를 활용하여 설계자는 창의적인 기구구성을 보다 효율적으로 수행할 수 있게 된다.

• The International Journal of Costume Culture
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• 제8권2호
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• pp.105-110
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• 2005

This paper documents a dress design process to demonstrate the theory that form follows intent. It includes a statement of the design context as a venue where the conceptual intent originated. The dragon icon became the subject, form, and content of the design project. The author's designerly endeavor is discussed with focus on reconfiguration of formal characteristics shown in the visual reference of the eastern dragon symbol into a dress design with the consideration of utilitarian, expressive, and symbolic issues. Throughout the process, the author was an active agent who created formal characteristics, manifested a thought into an object, and imbued a meaning to the dress, demonstrating the notion that form follows intent.

• Ocean Systems Engineering
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• 제10권1호
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• pp.111-129
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• 2020

A simplified algorithm is proposed for fast estimation of the material quantities required for the construction of rubble-mound breakwaters. The proposed algorithm is able to employ only the data available at feasibility study phase such as the maximum draught of the design ship selected to transport the cargos to the harbor despite, because at the feasibility phase, information for the planned harbor is likely to be very limited. A linear-constant waterdepth model together with a proposed section configuration for the breakwaters, which is customary for harbors, is considered to calculate the quantity of materials. The numerical simulation of the wave characteristics has been verified using the recorded wave data collected by a buoy installed near the Neka harbor in Caspian Sea waters. A case study has been also applied to four harbors to validate the proposed algorithm. The estimated weights using the proposed linear-constant and multi-linear waterdepth models were compared using the bathymetry maps and layouts of these harbors. A computer program, written in QBasic language, has been developed to simulate the wave characteristics and to estimate the material quantities needed to construct a rubble-mound breakwater. The obtained results show that taking into account the acceptable accuracies normally applied to the feasibility study and conceptual design phases, the proposed algorithm is sufficiently accurate and highly effective for the conceptual estimation of materials' quantities of breakwaters in the feasibility study phase of harbor projects.

• 해양환경안전학회지
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• 제8권1호
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• pp.53-59
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• 2002

A correctly designed bridge offers improved operational safety in terms of increased vigilance, flexibility of operation, precision of control and operator＇s situational awareness. According1y to design human centered bridge, the consideration shall be given to the man-machine interface, location and interrelation of workstation, configuration of console, windows. field of vision and bridge working environment. The state-of-the-art suits for one-man operation by integration of conning information and central information presentation. Further, it is desirable to enable two man ship operation for emergency operations, training purposes and redundancy. In this point of view, this thesis would like to design a conceptual bridge.

• 한국추진공학회지
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• 제21권6호
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• pp.8-14
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• 2017

로터크래프트의 동력전달장치용 기어박스는 엔진에서 생성된 동력을 승하강 및 전진 비행을 위한 팬 및 푸셔로 전달하며, 사용목적에 따라 메인기어박스, 보조기어박스로 구분된다. 로터크래프트 동력전달장치용 기어박스의 주 설계 목표는 주어진 요구사항(전달동력, 장착공간 등)을 모두 만족시키는 범위에서 가능한 경량화 설계를 하는 것이다. 특히 기어박스는 같은 기능을 하더라도 시스템 구성에 따라 전체 중량이 크게 달라질 수 있기 때문에 경량화를 위해서는 초기 개념 설계가 매우 중요하다. 본 연구에서는 엔진의 장착 위치에 따른 기어박스의 다양한 개념 설계를 수행하였다. 또한 각 개념 설계에 따른 기어, 베어링 등의 요소부품 설계를 수행하여 시스템 구성에 따른 예상 중량을 비교 검토하였다.

• Nuclear Engineering and Technology
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• 제34권6호
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• pp.610-618
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• 2002

A study of the conceptual data modeling to realize the decommissioning database on the HRR-1&2 was carried out. In this study, the current state of the abroad decommissioning database was investigated to make a reference of the database. A scope of the construction of decommissioning database has been set up based on user requirements. Then, a theory of the database construction was established and a scheme on the decommissioning information was classified . The facility information, work information, radioactive waste information, and radiological information dealing with the decommissioning database were extracted through interviews with an expert group and also decided upon the system configuration of the decommissioning database. A code which is composed of 17 bit was produced considering the construction, scheme and information. The results of the conceptual data modeling and the classification scheme will be used as basic data to create a prototype design of the decommissioning database.

• 한국군사과학기술학회지
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• 제2권1호
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• pp.38-60
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• 1999

The main objective of this study is systemization of the technique of ROC quantification and optimization of baseline design by applying CE principle to the acquisition process of a weapon system. QFD and TOA techniques can be employed to a good working example of the conceptual design of a future main battle tank. In this paper, Product Planning Phase, the first phase of four QFD phases, is deployed in terms of eight steps including customer requirements and final product control characteristics. TOA is carried out considering only combat weight. In order to perform combat weight analysis and performance TOA, Preliminary Configuration Synthesis Methodology is used. Preliminary Configuration Synthesis Methodology employs the method of least squares and described linear equations of weight interrelation equation for each component of tank. As a result of QFD based upon the ROC, it was cleared that armor piercing power, main armament, type of ammunition, cruising range, combat weight, armor protection, power loading, threat detection and cost are primary factors influencing design and that combat weight is the most dominant one. The results of TOA based on the combat weight constraint show that 5100 lb reduction was required to satisfy the ROC. The baseline design of a future main battle tank is illustrated with assumption that all phases of QFD are employed to development and production process of subsystems, components, and parts of main battle tank. TOA is applied in iterative process between initial baseline design and ROC. The detailed design of each component is illustrated for a future main battle tank.

• 한국초전도ㆍ저온공학회논문지
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• 제21권1호
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• pp.25-30
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• 2019

This paper presents a conceptual design approach of air-cored synchronous machine with high temperature superconductor (HTS) field winding. With a given configuration of a target machine, boundary conditions are set in the cylindrical coordinate system and analytic field calculation is performed by solving a governing equation. To set proper boundary conditions, current distributions of the field winding and the armature winding are expressed by the Fourier expansion. Based on analytic magnetic field calculation results, key machine parameters are calculated: 1) inductance, 2) critical current of field winding, 3) weight, 4) HTS conductor consumption, and 5) efficiency. To investigate all potential design options, 6 sweeping parameters are determined to characterize the geometry of the machine and the parameter calculation process is performed for each design options. Among design options satisfying constraints including >80 % critical current margin and >95 % efficiency, in this paper, a first-cut design was selected in terms of overall machine weight and HTS conductor consumption to obtain a lightweight and economical design. The goal is to design a 5-MW machine by referring to the same capacity machine that was previously constructed by another group. Our design output is compared with finite element method (FEM) simulation to validate our design approach.

• 유체기계공업학회:학술대회논문집
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• 유체기계공업학회 2001년도 유체기계 연구개발 발표회 논문집
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• pp.11-16
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• 2001

It is not easy to apply a small-sized centrifugal fan to the duct used for the thermal management of home electronic appliances due to complex design parameters of its blades and scroll. The main objective of this study was to develop the systematic process to design an optimal centrifugal fan based on the 3-dimensional configuration of blades obtained from the conceptual design program self-developed with the given design constraints such as the flow rate, the total pressure loss, the size of fan, and the number of rotation. The design process to find an optimal centrifugal fan for refrigerator was technologically linked in many ways. The complex grid generation system of the fan model included scroll was adopted for the numerical simulation. The FVM CFD code, FLUENT, was used to investigate the three dimensional flow pattern at the coordinate system of rotating frame and to check the optimal performance of the fan. By using this design process, a selected centrifugal fan was designed, numerically simulated, manufactured and experimentally tested in the wind tunnel. The performance curve of fan manufactured by NC process was compared with numerically obtained characteristic curve. The developed design method was proved into being excellent because these two curves were well matched.

• 한국항공우주학회지
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• 제46권6호
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• pp.452-463
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• 2018

Tip-jet gyroplane은 제자리 비행 시 tip-jet의 반발력을 이용하여 로터의 회전력을 얻고, 전진 비행 시 오토자이로 형태로 비행하는 복합형 회전익기의 한 종류이다. Tip-jet gyroplane의 적절한 성능해석과 개념 설계 단계의 사이징을 수행하기 위해서는 tip-jet 모드, gyroplane 모드, transient 모드를 모두 고려할 수 있는 설계 및 해석 기법이 필요하다. 본 연구에서는 이 세 가지 비행 모드 성능해석과 기체 사이징을 수행할 수 있는 코드를 개발하였다. 해석 기법은 tip-jet gyroplane 비행 모드를 이루고 있는 해석 코드 별로 각각 실험값과 비교 검증되었다. 개발된 코드를 이용하여 300km 혹은 400km의 임무 운용반경에서 150knots의 고속 비행을 수행하는 2가지 임무형상에 대해 초기사이징을 수행하였고, 초기 사이징 결과로 설계된 3,000lb 급 tip-jet gyroplane의 형상 및 성능을 분석하였다.