파라메트릭 사영필터를 이용한 2차원 트러스 구조물의 손상 추정

문효준,서일교 대한건축학회 2004 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.24 No.1(구조계)

In this paper, a study of damage assessment for 2- Dimensional Truss Structures using the parametric projection filter theory is presented. Many researchers are interested in inverse problem and one of solution procedures for inverse problems that are very effective is the approach using the filtering algorithm in conjunction with numerical solution methods. In filtering algorithm, the Kalman filtering algorithm is well known and have been applied to many kind of inverse problems. In this paper, the Parametric projection filtering in conjunction with structural analysis is applied to the identification of damages in 2-D truss structures. The natural frequency and modes of damaged truss model are adopted as the measurement data. The effectiveness of proposed method is verified through the numerical examples.

비선형 파라메트릭 사영필터를 이용한 2차원 트러스 구조물의 손상추정에 적용된 손상지표의 유효성과 수렴성에 관한 연구

문효준,오창희,서일교 제주대학교 공과대학 첨단기술연구소 2005 尖端技術硏究所論文集 Vol.16 No.2

A study on the effectiveness and convergency of damage measures for structural damage detection using the nonlinear parametric projection filter algorithm is presented in this paper. Damage measures are associated with the change in mode shape and displacement due to structural damage. So, five damage measures are presented in this paper. They are static displacement, curvature of static displacement, natural frequency, mode shape and curvature of mode shape. The static data are obtained by loading static load to the structure. And modal and dynamic data of a vibrating structure can be gained without dismantling the structure, these data are very useful in various aspects. But the results of detection are affected by the kind of damage measures to be used. The effectiveness and convergency of these damage measures on the structural damage detection using the nonlinear parametric projection filtering algorithm are demonstrated with the numerical examples.

일반화된 역행렬을 사용한 실시간 시스템 인식에 대한 연구

문효준,은희창,서일교 제주대학교 공과대학 첨단기술연구소 2003 尖端技術硏究所論文集 Vol.14 No.2

This study provided an analytical method for real-time system identification by utilizing fundamental linear algebra and minimizing a quadratic form of the differences in physical properties calculated from the initially given properties and the next expected properties. The validity of the proposed method depends on the selected weighting matrix. Although it was observed that the propostd methd gives reasonable values by the proper selection of the weighting matrix, the deficiency of this method like the proper selection of weighting matrix with time needs to he improved.

파라메트릭 사영필터 이론을 이용한 3차원 트러스 구조물의 손상추정

문효준,서일교 제주대학교 공과대학 첨단기술연구소 2004 尖端技術硏究所論文集 Vol.15 No.2

Space truss structures are composed of many members, so it is difficult to find damaged members from the whole system. Therefore, damage detection takes use of 2-step damage identification method. First, kinetic energy change ratio is used to find damage region including damaged members, and then extended parametric projection filter algorithm is used to detect damaged members in damage region. The results of 2-step damage identification method that apply to examples are next. First, in the case of finding damage region using kinetic energy change ratio, the ratios of nodes including damage members are large, so we can consider as this measure is effective. Next, in the case of finding damaged members at nodes of damage regions using extended parametric projection filter algorithm, the stiffness ratios of damaged members converge exactly.

파라메트릭 사영필터를 이용한 트러스 구조물의 손상 검출

문효준,서일교 제주대학교 공과대학 첨단기술연구소 2004 尖端技術硏究所論文集 Vol.15 No.1

In this paper, a study of damage detection for 2-Dimensional Truss Structures using the parametric projection filter theory is presented. Many researchers are interested in inverse problem and one of solution procedures for inverse problems that are very effective is the approach using the filtering algorithm in conjunction with numerical solution methods. In filtering algorithm, the Kalman filtering algorithm is well known and have been applied to many kind of inverse problems. In this paper, the Parametric projection filtering in conjunction with structural analysis is applied to the identification of damages in 2-D truss structures. The natural frequency and modes of damaged truss model are adopted as the measurement data. The effectiveness of proposed method is verified through the numerical examples.

댐퍼의 위치가 부속실 및 방화문에서의 열 유동 특성에 미치는 영향에 관한 수치해석 연구

문효준,고권현,유홍선 한국화재소방학회 2013 한국화재소방학회논문지 Vol.27 No.1

The pressurized smoke control system is important for fire safety in building because it is directly concerned with egress time of people. Even though the damper plays an essential role in the pressurized smoke control system, the phenomena of backflow smoke occurs for a certain the damper position. The research for a position of damper effects on distribution of air flow at the fire door is not performed. In this study, numerical simulation using FDS 5.5 was carried out to analyze the effect of the position of damper on flow distribution at the fire door. To simulate real situation, effects of opening and closing of fire door was considered. As a result, when HRR was between 200 kW and 400 kW, in the case which the damper was on the opposite wall of the fire door, the back flow to the vestibules was large compared to the two other cases of damper position. But when HRR was above 400 kW, Effect on damper position was not occurred. 급기가압 제연시스템은 재실자의 피난활동 및 피난시간에 직접적인 영향을 미치므로 건축물의 화재안전에 있어 핵심적인 설비이다. 하지만 댐퍼의 위치에 따라 방화문에서 부속실로 연기가 유입되는 현상이 발생할 수 있으며 이에 대한연구는 미비한 실정이다. 본 연구에서는 댐퍼위치에 따른 부속실과 방화문에서의 열 유동특성 및 연기가 부속실로 유입되는 현상을 FDS 5.5를 이용하여 수치해석으로 분석하였다. 또한 실제 현상을 구현하기 위해 재실자의 피난을 가정하여방화문이 개방되고 폐쇄되는 효과를 설정하였으며 열 방출률을 변화시키면서 수치해석을 수행하였다. 수치해석 결과, 열방출률이 200 kW에서 400 kW 일 때는 댐퍼의 위치가 방화문의 정면일 때 다른 댐퍼의 위치보다 연기가 부속실로 유입되는 현상을 나타났다. 하지만 열 방출률이 400 kW 이상일 경우에는 댐퍼의 위치에 대한 영향이 크지 않았다.

비선형 파라메트릭 사영필터에 의한 트러스 구조물의 손상 검출

문효준,서일교 한국공간구조학회 2004 한국공간구조학회지 Vol.4 No.2

본 논문에서는 비선형 파라메트릭 사영필터를 이용한 2차원 트러스 구조물의 손상 검출에 대한 연구를 제시한다. 역문제의 해석은 최근 많은 관심을 끌고 있으며, 역문제 해석법으로서 필터이론을 사용한 접근법이 많은 관심을 받고 있다. 특히 칼만 필터는 신호 통신, 시스템 제어 등의 많은 분야에서 적용되어 왔으며 그 유효성이 입증되었다. 본 논문에서는 비선형 파라메트릭 사영필터를 2차원 트러스 구조물의 손상추정에 적용하고 손상된 구조물의 고유 진동수과 고유 모드를 관측 데이터로 채택하여 손상부재의 위치와 손상정도를 추정한다. 마지막으로 수치해석 예를 통하여 제안된 해석법의 유효성을 밝힌다. In this paper, a study of damage detection for 2-Dimensional Truss Structures using the parametric projection filter theorr is presented. Many researchers are interested in inverse problem and one of solution procedures for inverse problems that are very effective is the approach using the filtering algorithm in conjunction with numerical solution methods. In filtering algorithm, the Kalman filtering algorithm is well known and have been applied to many kind of inverse problems. In this paper, the Parametric projection filtering in conjunction with structural analysis is applied to the identification of damages in 2-D truss structures. The natural frequency and modes of damaged truss model are adopted as the measurement data. The effectiveness of proposed method is verified through the numerical examples.

일반화된 역행렬을 사용한 실시간 시스템 인식에 대한 연구

문효준,은희창,서일교 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.2(구조계)

This study provided an analytical method for real-time system identification by utilizing fundamental linear algebra and minimizing a quadratic form of the differences in physical properties calculated from the initially given properties and the next expected properties. The validity of the proposed method depends on the selected weighting matrix. Although it was observed that the proposed method gives reasonable values by the proper selection of the weighting matrix, the deficiency of this method like the proper selection of weighting matrix with time needs to be improved.

시대를 앞서간 패션디자이너 Christopher Nemeth 디자인 특성 분석

문효준(Hyo Joon Moon),정경희(Kyung Hee Jung),배수정(Soo Jeong Bae) 전남대학교 생활과학연구소 2021 生活科學硏究 Vol.31 No.-

This study aims to provide a source of inspiration to current upcycling fashion design development and fashion designers by analyzing the design characteristics of British designer Christopher Nemeth, who was active in the 1980s and 1990s. Through Nemeth’ analysis of fashion design, which presents such avant-garde and deconstructive aesthetics, we would like to present the possibility of developing a new upcycling fashion design that can show creative perspective and personality. Analysis of the characteristics of each period of his career showed that in the early 1980s, he used old fabrics and clothing as canvas, and in the early 1980s to early 1990s, he completed his style with his representative stitch, recycling and rope patterns, and genders can wear. Currently, as his work is maintained by his post-family, not only clothing products including tops and bottoms, but also accessories such as bags, belts, hats, pouches, socks, and cushion covers are being produced. As a result of analyzing the design characteristics of his work, it was found that the composition lines and materials of the unique side were recycled, the details of his artistic sensibility as if looking at artworks, and the effects of clothing accessories used in details in various locations. Overall, it was confirmed that it could be a source of inspiration for many designers recently because it was avant-garde and the use of materials and details ahead of the times stood out. Christopher Nemeth’ work presented a new design that completely reverses the existing dressing paradigm, and showed the possibility of developing various designs that fashion designers can freely find ideas in the way materials are used and ideas are expressed. Therefore, Christopher Nemeth’ design characteristics can present positive possibilities for the development of upcycling designs that recycle used clothes and materials, and confirm the feasibility of upcycling designs. In addition, Christopher Nemeth’ works remain symbolic enough to be said to be a source of design, and are expected to exert a deep influence in the future.

워터미스트 시스템의 변압기실 화재 진압성능에 대한 실험적 연구

문효준(Hyojun Moon),박정렬(Jeong-Ryul Park),권문섭(Moon-Sub Kown),고권현(Gwon Hyun Ko),노경철(Kyoungchul Ro) 한국산학기술학회 2014 한국산학기술학회 학술대회 Vol.2014 No.2

워터미스트 화재진압기술은 400 μm 이하로 물 액적을 미립화 및 분사하여 질식, 냉각 및 복사열 차단효과의 메커니즘으로 화재를 진압하는 기술로써 일반화재, 유류 및 전기화재 등 다양한 화재를 진압할 수 있는 기술이다. 이러한 워터미스트 소화기술은 친환경적이고 수손의 피해가 없으며 수원의 양 측면에서 효율적인 기술이다. 본 연구에서는 워터미스트 시스템의 변압기 화재 소화성능을 분석하기 위해 유동특성실험 및 변압기 모형화재실험을 수행하였다. 실험결과, 워터미스트는 80 bar에서 적절한 분사유량 및 각도, 액적의 직경을 보였으며 이러한 압력조건에서 변압기 모형화재에 대해 우수한 소화성능을 확인하였다.