• Structural Monitoring and Maintenance
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• 제10권1호
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• pp.63-86
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• 2023

Structural health monitoring and damage detection are essential for assessing, maintaining, and rehabilitating structures. Most of the existing damage detection approaches compare the current state structural response with the undamaged vibrational structural response, which is unsuitable for old and existing structures where undamaged vibrational responses are absent. One of the approaches for existing structures, numerical model updating/inverse modelling, available in the literature, is limited to numerical studies with high-end software. In this study, an attempt is made to study the effectiveness of the model updating technique, simplify modelling complexity, and economize its usability. The optimization-based detection problem is addressed by using programmable open-sourced code, OpenSees^® and a derivative-free optimization code, NOMAD^®. Modal analysis is used for damage identification of beam-like structures with several damage scenarios. The performance of the proposed methodology is validated both numerically and experimentally. The proposed method performs satisfactorily in identifying both locations and intensity of damage in structures.

• 통합자연과학논문집
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• 제16권3호
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• pp.97-102
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• 2023

The gasdermins are a family of recently identified pore-forming effector proteins that cause membrane permeabilization and pyroptosis, a lytic pro-inflammatory type of cell death. A role in the regulation of cell proliferation and/or differentiation is suggested by the differentiation status-specific expression of gasdermin proteins in epithelial tissues. One of the GSDM protein is Gasdermin A (GSDMA), which decreased in stomach and esophageal cancers, suggesting a tumor suppressor role. GSDMA receptor antagonists have been researched as potential treatments for inflammatory diseases and baldness. GSDMA's significance in a wide range of disorders makes it an important therapeutic target. As a result, homology modelling of the GSDMA receptor was undertaken in the current study using the crystal structures of Mus musculus (GSDMA3), Human gasdermin D (GSDMD), and Murine gasdermin D (murine GSDMD). The best model was chosen based on the validation results after 20 models were developed utilising single template-based approaches. The generated structures can be used for further binding site and docking studies in the future.

• Advances in environmental research
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• 제3권1호
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• pp.45-69
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• 2014

The groundwater has been a major source of water supply throughout the ages. Around 50% of the rural as well as urban population in the developing countries like India depends on groundwater for drinking. The groundwater is also an important source in the agriculture and industrial sector. In many parts of the world, groundwater resources are under increasing threat from growing demands, wasteful use and contamination. A good planning and management practices are needed to face this challenge. A key to the management of groundwater is the ability to model the movement of fluids and contaminants in the subsurface environment. It is obvious that the contaminant source activities cannot be completely eliminated and perhaps our water bodies will continue to serve as receptors of vast quantities of waste. In such a scenario, the goal of water quality protection efforts must necessarily be the control and management of these sources to ensure that released pollutants will be sufficiently attenuated within the region of interest and the quality of water at points of withdrawal is not impaired. In order to understand the behaviour of contaminant transport through different types of media, several researchers are carrying out experimental investigations through laboratory and field studies. Many of them are working on the analytical and numerical studies to simulate the movement of contaminants in soil and groundwater of the contaminant transport. With the advent of high power computers especially, a numerical modelling has gained popularity and is indeed of particular relevance in this regard. This paper provides the state of the art of contaminant transport and reviews the allied research works carried out through experimental investigation or using the analytical solution and numerical method. The review involves the investigation in respect of both, saturated and unsaturated, porous media.

• 지질학회지
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• 제54권6호
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• pp.631-640
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• 2018

퇴적층의 두께와 형성 기간을 분석하는 것은 퇴적분지의 발달사를 이해하기 위한 분지 해석과 모델링 연구에서 중요하다. 분지 발달 과정에서 퇴적층은 깊이가 증가함에 따라 다짐 작용에 의해 두께가 감소하고, 이 두께 변화는 깊이에 따른 공극률 변화 경향(다짐 작용 경향)을 통해 계산이 가능하다. 이 연구에서는 대표적인 퇴적암상인 사암, 셰일, 탄산염암의 깊이에 따른 공극률 변화 자료를 기반으로, 암상에 따른 다짐 작용 경향의 범위를 지수 함수를 이용하여 정량화하였다. 그리고 다짐 작용이 퇴적층의 공극률과 두께 변화에 미치는 영향을 수치해석적 방법을 이용해 평가하였다. 사암은 초기 공극률의 범위가 좁고 깊이 증가에 따른 공극률 감소 경향이 비교적 일정하여, 다짐 작용에 의한 층두께의 변화 범위가 작다. 셰일은 약 2,000 m 깊이까지 공극률이 빠르게 감소한 후, 급격히 낮아진 감소율을 보이며 이는 퇴적층의 두께 변화에도 반영된다. 탄산염암은 초기 공극률의 범위가 넓고, 깊이 증가에 따른 공극률 감소 양상의 차이가 커서, 결과적으로 다짐 작용에 의해 감소한 퇴적층 두께 차이의 범위도 크게 나타난다. 이 수치 해석적 다짐 작용 연구의 정량적 분석 결과에서 나타난 각 암상들의 다짐 작용에 따른 공극률과 층두께 감소의 특징들은 퇴적분지의 생성과 발달 과정을 이해하기 위해 필요한 퇴적층 두께 복원과 침강사 그리고 지열 작용 분석에 영향을 끼치며, 이는 다짐 작용 경향이 분지 모델링 연구에서 중요한 요소이며 적절한 적용이 필요함을 보여준다.

• 대기
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• 제26권3호
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• pp.445-459
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• 2016

Air temperature deviation (ATD) is one of major indicators to represent spatial distribution of urban heat island (UHI), which is induced from the urbanization. The purpose of this study is to evaluate the accuracy of air temperature deviation about Climate Analysis Seoul (CAS) workbench, which had developed by National Institute Meteorological Science and TU Berlin. Comparison and correlation analysis for CAS ATD including meso-scale air temperature deviation, local-scale air temperature deviation, total air temperature deviation, surface heat flux deviation, cold air production deviation among meso-scale numerical modelling variable in 'Seoul Region', micro-scale numerical modelling in 'Detail Region', and CAS workbench variable using observation data in ground stations. Comparison between night time OBS ATD and CAS ATD show that have most close values. Most of observations ($dT_{max}$ and $dT_{min}$) have highly positive ($dT_{SHP}$, $dT_{CA}$, MD, TD, $f_{BS}$, $f_{US}$, $f_{WS}$, $h_B$) and negative ($f_{VS}$, $f_{TV}$, $h_V$, Z) correlations. However, CAS workbench needs further improvement of both observational framework and analytical framework to resolve the problems; (1) night time OBS ATD of has closer values in compare with at high rise mountain area and (2) correlations are very dependable to meteorological scale.

• 지구물리와물리탐사
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• 제14권1호
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• pp.88-97
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• 2011

최적화된 4진트리 격자화 기법을 이용한 중력변화율 탐사의 지형 효과 계산 방법을 제시하고자 한다. 제시하고자 하는 방법은 항공탐사의 자료처리를 위하여 지형 자료에 최적화된 빠르고 정확한 지형효과 계산법이다. 각 지점에서의 지형효과 계산에 이용되는 지표 고도 자료는 자동적으로 원하는 정밀도를 제공할 수 있는 최대 크기로 격자화 되어 최대 해상도 자료를 이용하는 방법에 비하여 빠른 계산이 가능하다. 이러한 최적화된 격자 크기는 각 지점에서의 거리와 지표의 고도 변화를 고려하여 구성된다 새로운 접근 방법을 검증하기 위하여 수치모델링과 현장자료에 적용하였다. 현장 자료에 적용한 결과 최적 4 진트리 기법은 최고 해상도 자료를 모두 이용한 방법과 비교하여 중력 변화율 자료에서 1EU(E$\"{o}$tv$\"{o}$s unit)의 정밀도를 유지하면서 계산양은 1/351로 줄일 수 있었다. 또한, 중력탐사 결과의 지형보정에 이용한 결과 모든 DEM자료를 이용한 계산에 비하여 310배나 빠른 계산이 가능하였다.

• Steel and Composite Structures
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• 제19권4호
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• pp.789-809
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• 2015

This paper presents experimental and numerical studies into the structural behavior of a high performance corbel type composite connection adopted in Raffles City of Hangzhou, China. Physical tests under both monotonic and quasi-static cyclic loads were conducted to investigate the load carrying capacities and deformation characteristics of this new type of composite connection. A variety of structural responses are examined in detail, including load-deformation characteristics, the development of sectional direct and shear strains, and the history of cumulative plastic deformation and energy. A three-dimensional finite element model built up with solid elements was also proposed for the verification against test results. The studies demonstrate the high rigidity, strength and rotation capacities of the corbel type composite connections, and give detailed structural understanding for engineering design and practice. Structural engineers are encouraged to adopt the proposed corbel type composite connections in mega high-rise buildings to achieve an economical and buildable and architectural friendly engineering solution.

• 한국전자거래학회:학술대회논문집
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• 한국전자거래학회 1997년도 한국전자거래학회 종합학술대회지
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• pp.269-286
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• 1997

This paper presents the results of analysis for the Flexible Computer Integrated construction(FCIC) system to adapt CALS on the construction industry- Acquisition and supply process of the system are represented by IDEF0 function models and FCIC information systems are briefly described in this paper. The model presented here used as a reference for the development of CALS system.

• 한국생물환경조절학회:학술대회논문집
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• 한국생물환경조절학회 1992년도 학술논문발표요지
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• pp.23-24
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• 1992

식물공장에서 식물생산시 어떤 종류의 인공광을 사용하는가는 중요하다. 지금까지 연구는 HID(High Intensity Discharge)램프가 생육에 좋다고 하였으나, 실제로 너무 비싼 가격때문에 실제는 유럽의 농가에서도 이용되지 않고 있다. 본 연구는 자연광, 형광등, 백열등, 특수램프를 이용한 보광을 통해 광조건에 따른 백경채, 탑채, 상추, 쑥갓, 잎들께의 생육을 보고자 하였다. (중략)

• 한국생물환경조절학회:학술대회논문집
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• 한국생물환경조절학회 1992년도 학술논문발표요지
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• pp.25-26
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• 1992

식물공장에서 식물생산에 중요한 요인의 하나가 최적 양액과 배지조건이다. 세계적으로 식물공장은 완전한 수경지배시설을 갖추고 있으나 우리나라는 아직 초기단계에 있어 여러가지 기초연구가 부족한 실정이다. 그러므로 우리의 현실에 알맞은 조건을 찾아내어 실용화하기 위한 연구과정의 하나로 수경재배시의 배지와 양액종류에 따른 엽채류의 생육을 살펴보고자 한다. (중략)