• Journal of Advanced Marine Engineering and Technology
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• 제39권3호
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• pp.206-210
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• 2015

NOVEC 가스 소화 설비는 소화 약제 보관용기에 보관되어 있는 NOVEC 가스를 보호구역에 정해진 시간 안에 방출하는 것이 가장 중요하며, 이를 위해서는 적절한 배관장치의 배치와 크기를 결정하는 것이 중요한 사항이다. 본 연구에서는 배관망해석 기법을 활용하여 NOVEC 가스 소화 설비의 설계방법론을 개발하였다. 설계방법론에 기초하여 각종 설계계수들을 결정 하였다. 개발된 방법론에 의해 소화 약제 방출시간에 대하여 계산한 결과 총 6.498초로 계산되어 제한시간인 10초 이내로 만족하는 것을 알 수 있었으며, 그 때의 압력손실은 21.09bar 이었다.

• Nuclear Engineering and Technology
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• 제31권3호
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• pp.257-266
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• 1999

A simplified statistical methodology is developed in order to both reduce over-conservatism of deterministic methodologies employed for PWR fuel rod internal pressure (RIP) calculation and simplify the complicated calculation procedure of the widely used statistical methodology which employs the response surface method and Monte Carlo simulation. The simplified statistical methodology employs the system moment method with a deterministic approach in determining the maximum variance of RIP The maximum RIP variance is determined with the square sum of each maximum value of a mean RIP value times a RIP sensitivity factor for all input variables considered. This approach makes this simplified statistical methodology much more efficient in the routine reload core design analysis since it eliminates the numerous calculations required for the power history-dependent RIP variance determination. This simplified statistical methodology is shown to be more conservative in generating RIP distribution than the widely used statistical methodology. Comparison of the significances of each input variable to RIP indicates that fission gas release model is the most significant input variable.

• 한국전자통신학회논문지
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• 제16권2호
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• pp.261-270
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• 2021

본 연구에서는 계통 연계 3상 인버터를 위한 LCL 필터를 설계 방법론을 연구하였다. 먼저, 대표적인 필터 구조들에 대해서 3상 인버터의 계통 연계를 위한 필터로서의 적용 시 장단점을 분석하였다. 다음, 3상 인버터의 계통 연계를 위한 필터 설계 방법론들을 분석하여 그리드 연계 시 고조파 요구 조건을 만족할 수 있는 효과적인 필터 설계 방법론을 결정하였다. 그리고 설계 방법론의 유효성을 확인하기 위해서 EMTP-RV를 이용하여 3상 인버터, LCL 필터 그리고 필터의 성능을 평가하기 위한 성능 평가 시스템을 모델링 하였다. 끝으로, 하나의 3상 인버터에 대한 LCL 필터를 설계하였으며, EMTP-RV 시뮬레이션 작업을 통해 3상 인버터의 출력 전류 리플의 크기가 제한됨을 확인함으로서 설계 방법론의 유효성을 검증할 수 있었다.

• Asia pacific journal of information systems
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• 제9권3호
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• pp.47-73
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• 1999

Nowadays, the modeling of information systems have been enabled by various models and methodologies that are used for different purposes and perspectives upon the systems. The integrated modeling methodology that integrates these models and methodologies has become important concerns in system integration such as CIM and PDM. The primary objective of this paper is to propose a comprehensive integrated modeling methodology that integrates the OOIDEFO function model, OOIDEFO information model, node model, user interface model, and organization model for an effective analysis, design and implementation for system integration. This methodology covers the generic requirements of modeling methodology such as graphical notations, modeling processes, and abstraction mechanisms. Also, this methodology uses an 00 paradigm throughout the entire systems development life cycle. In order to prove the consistency and efficiency of the proposed methodology, the CIMS for ship production is modeled and prototyped.

• 전기학회논문지
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• 제58권1호
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• pp.199-202
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• 2009

Scan design is currently the most widely used structured Design For Testability approach. In scan design, all storage elements are replaced with scan cells, which are then configured as one or more shift registers(also called scan chains) during the shift operation. As a result, all inputs to the combinational logic, including those driven by scan cells, can be controlled and all outputs from the combinational logic, including those driving scan cells, can be observed. The scan inserted design, called scan design, is operated in three modes: normal mode, shift mode, and capture mode. Circuit operations with associated clock cycles conducted in these three modes are referred to as normal operation, shift operation, and capture operation, respectively. In spite of these, scan design methodology has defects. They are power dissipation problem and test time during test application. We propose a new methodology about scan shift clock operation and present low power scan design and short test time.

• Earthquakes and Structures
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• 제14권4호
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• pp.361-377
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• 2018

In this paper, an alternative reliability-based methodology is developed and implemented on the safety evaluation of structures subjected to seismic loading. To effectively elaborate the approach, structures are represented by finite elements and seismic loading is applied in time domain. The accuracy of the proposed reliability-based methodology is verified using Monte Carlo Simulation. It is confirmed that the presented approach provides adequate accuracy in calculating structural reliability. The efficiency and robustness in problems related to performance-based seismic design are verified. A structure designed by experts satisfying all post-Northridge seismic design requirements is studied. Rigidities related to beam-to-column connections are incorporated. The structure is excited by three suites of ground motions representing three performance levels: immediate occupancy, life safety, and collapse prevention. Using this methodology, it is demonstrated that only hundreds of deterministic finite element analyses are required for extracting reliability information. Several advantages are documented with respect to Monte Carlo Simulation. To showcase an applicability extension of the proposed reliability-based methodology, structural risk is calculated using simulated ground motions generated via the broadband platform developed by the Southern California Earthquake Center. It is validated the accuracy of the broadband platform in terms of structural reliability. Based on the results documented in this paper, a very solid, sound, and precise reliability-based methodology is proved to be acceptable for safety evaluation of structures excited by seismic loading.

• 복식
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• 제59권7호
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• pp.154-171
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• 2009

The purpose of this study is to analyze minimalism in the environment-friendly aspect and to suggest methodology of environment-friendly fashion design. The results of this study are as follows. First, it is possible to create newly fashion-designed goods by re-arranging used goods. This method is environment-friendly, in that it recycles resources and simplifies production process. It can also meet the sense of beauty of consumers by reviving the intrinsic beauty of the used goods. Second, When we produce brand new fashion-designed goods with used goods as raw materials, the new ones reflect specific characters of the used goods which originate from their own times and regions. In this way, this method can be a fashion design which accommodate multi-cultural trends. Third, it is possible to produce goods designed by inspiration from a human body. This fashion-design method includes several ways, such as usage of human body silhouette, composition of colors using natural dyeing, and usage of natural materials. Recognizing a human being as a creature interacting with the nature can broaden range of imagination in design methodology.

• Earthquakes and Structures
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• 제22권1호
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• pp.95-107
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• 2022

This paper introduces a novel, rigorous, and efficient probabilistic methodology for the performance-based optimal design (PBOD) of semi-active tuned mass damper (SATMD) for seismically excited nonlinear structures. The proposed methodology is consistent with the modern performance-based earthquake engineering framework and aims to design reliable control systems. To this end, an optimization problem has been defined which considers the parameters of control systems as design variables and minimization of the probability of exceeding a targeted structural performance level during the lifetime as an objective function with a constraint on the failure probability of stroke length damage state associated with mass damper mechanism. The effectiveness of the proposed methodology is illustrated through a numerical example of performance analysis of an eight-story nonlinear shear building frame with hysteretic bilinear behavior. The SATMD with variable stiffness and damping have been designed separately with different mass ratios. Their performance has been compared with that of uncontrolled structure and the structure controlled with passive TMD in terms of probabilistic demand curves, response hazard curves, fragility curves, and exceedance probability of performance levels during the lifetime. Numerical results show the effectiveness, simplicity, and reliability of the proposed PBOD method in designing SATMD with variable stiffness and damping for the nonlinear frames where they have reduced the exceedance probability of the structure up to 49% and 44%, respectively.

• 산업융합연구
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• 제20권6호
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• pp.1-6
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• 2022

본 논문은 외부 설치 금속조형물의 디자인 방법론에 대한 연구로부터 시작되었다. 디자인의 범위와 의미가 커지면서 외부 설치 조형물에도 디자인의 개념이 사용되고, 조형물에 주변환경에 어울리면서 설치환경의 이야기를 담고 있는 조형물 디자인이 요구되고 있는 실정이다. 이러한 개념은 전문가들 사이에서만 환경조형물이라고 정의되고 있다. 환경조형물의 개념은 아직은 대중적이지 않고 학문적 연구 또한 미흡한 상태이다. 이에 연구자는 외부 설치 조형물을 환경조형물로 정의하기 위해 굿디자인의 개념과 조건과 환경조형물의 개념과 역할을 이론적 배경으로 알아보고 굿디자인의 개념과 조건, 환경조형물의 개념과 역할에 대해 분류하였다. 이론적 배경을 바탕으로 굿디자인의 조건과 환경조형물의 역할을 활용하여 연구자의 디자인 전개 요소를 통해 금속환경조형물로 완성하고 연구작품을 제시하였다. 결과적으로 금속환경조형물의 디자인 방법론을 제시하게 되었고 다양한 환경조형물 디자인 연구가 지속되어 융합적 환경조형물의 다양한 패러다임이 연구되기를 바란다.

• 대한기계학회논문집A
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• 제31권1호
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• pp.43-49
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• 2007

A new electric coil design methodology using the notion of topology optimization is developed. The specific design problem in consideration is to find optimal coil configuration that maximizes the Lorentz force under given magnetic field. Topology optimization is usually formulated using the finite element method, but the novel feature of this method is that no such partial differential equation solver is employed during the whole optimization process. The proposed methodology allows the determination of not only coil shape but also the number of coil turns which is not possible to determine by any existing topology optimization concept and to perform single coil strand identification algorithm. The specific applications are made in the design of two-dimensional fine-pattern focusing coils of an optical pickup actuator. In this method, the concept of equivalent magnetizing current is utilized to calculate the Lorentz force, and the optimal coil configuration is obtained without any initial layout. The method is capable of generating the location and shape of turns of coil. To confirm the effectiveness of the proposed method in optical pickup applications, design problems involving multipolar permanent magnets are considered.