Automated Finite Element Mesh Generation for Integrated Structural Systems

윤종열 한국지진공학회 2023 한국지진공학회논문집 Vol.27 No.2

The structural analysis module is an essential part of any integrated structural system. Diverse integrated systems today require, from the analysis module, efficient real-time responses to real-time input such as earthquake signals, extreme weather-related forces, and man-made accidents. An integrated system may also be for the entire life span of a civil structure conceived during the initial conception, developed throughout various design stages, effectively used in construction, and utilized during usage and maintenance. All these integrated systems’ essential part is the structural analysis module, which must be automated and computationally efficient so that responses may be almost immediate. The finite element method is often used for structural analysis, and for automation, many effective finite element meshes must be automatically generated for a given analysis. A computationally efficient finite element mesh generation scheme based on the r-h method of mesh refinement using strain deviations from the values at the Gauss points as error estimates from the previous mesh is described. Shape factors are used to sort out overly distorted elements. A standard cantilever beam analyzed by four-node plane stress elements is used as an example to show the effectiveness of the automated algorithm for a time-domain dynamic analysis. Although recent developments in computer hardware and software have made many new applications in integrated structural systems possible, structural analysis still needs to be executed efficiently in real-time. The algorithm applies to diverse integrated systems, including nonlinear analyses and general dynamic problems in earthquake engineering.

원료 샘플링 플랜트 자동화 시스템 개발을 위한 시스템엔지니어링 접근방안 연구

궉호균,홍대근,서석환,Kwouk, Ho-Kyun,Hong, Dae-Geun,Suh, Suk-Hwan 한국시스템엔지니어링학회 2015 시스템엔지니어링학술지 Vol.11 No.1

In steel making plant, sampling system for raw material such as iron ore, limestone is necessary for quality control purpose. For the sake of efficiency and productivity, automation of the sampling system is highly desirable. From technical standpoint, the development of the automated system requires multi-disciplinary domain knowledge such as mechanical engineering, industrial engineering, information technology and computer engineering. Up to present time, the development has been mainly carried out by a single domain expert with project manager. The automated system developed in this way caused problems in the final system. This paper suggests a systems engineering approach to the development of automation for raw material sampling plant via a tailored process called Plant Systems Engineering (PSE) Process based on ISO/IEC 15288. Through the PSE process, we could derive right requirements and architecture of the Systems Of Interest (SOI), and we were convinced that the PSE Process can be applied to many other Plant Systems.

텍스트 의미 분석 시스템의 구현과 활용 -UCREL Semantic Analysis System을 중심으로-

박민준 ( Park Minjun ) 덕성여자대학교 인문과학연구소 2024 인문과학연구 Vol.38 No.0

비록 최근 딥러닝 기술의 발전이 대규모 언어 모델[LLM] 기반 자연어 이해[NLU]라는 돌파구를 마련해주었지만, 여전히 특정한 문맥과 맥락 속에서 언어모델은 과거와 비슷한 실수를 반복한다. 이를 보조하기 위한 수단으로, 개념 체계 기반 의미 분석 시스템 [Concept-Based Abstracting system]은 자연어처리에 필요한 개념 정보를 제공함으로써 복잡다단한 자연어의 자동 의미 분석을 가능하게 한다. 본 연구는 개념 체계 기반 의미 분석 시스템의 하나인 랭캐스터 USAS[UCREL Semantic Annotation System]의 내부 구조와 작동 원리 및 활용 예시를 자세히 살펴본다. USAS는 본문에서 제시한 의미 중의성 해소[WSD], 텍스트 분류, 키워드 분석 등을 통해 자동화된 내용 분석[automatic content analysis]을 가능하게 하며, 이는 단순 반복 작업만을 수행하는 기계적인 시스템이 아니라 한층 발전된 범용적[versatile] 언어 인공지능으로 나아가는 계기를 마련해 준다. Although the recent advancement in deep learning technology has provided a breakthrough in LLM-based natural language understanding, language models still repeats mistakes similar to those of past models in certain contexts. As a means to guide them, the Concept-Based Abstracting system enables automatic semantic analysis of complex natural language by providing conceptual information necessary for natural language processing. This study examines in detail the internal structure, operational principle, and practical examples of Lancaster USAS (UCREL Semantic Annotation System), one of the concept-based semantic analysis systems. USAS enables automated content analysis through tasks such as disambiguation of meanings presented in the text (WSD), text classification, keyword analysis, etc. This goes beyond a mechanically repetitive system, serving as a significant step towards a more advanced and versatile language artificial intelligence.

생산자동화 시스템을 위한 산업용 로봇의 운전특성 시뮬레이션에 관한 연구

김진광 한국산업융합학회 2017 한국산업융합학회 논문집 Vol.20 No.5

This paper deals with 3D simulation of industrial robot for automated manufacturing system. In order to evaluate the operational characteristics of the industrial robot system in the worst case motion scenario, flexible - rigid multibody analysis was performed. Then, the rigid body dynamics analysis was performed and the results were compared with the flexible - rigid multibody analysis. Modal analysis was also performed to confirm the dynamic characteristics of the robot system. In the case of the flexible-rigid multibody simulation, only the structural members of interest were modeled as elastic bodies to confirm the stress state. The remaining structural members were modeled as rigid bodies to reduce computer resources.

고성과작업시스템과 조직성과 - 자동화 정도가 미치는 조절 효과의 시사점 -

김민철,권순식 한국산업경영학회 2020 경영연구 Vol.35 No.4

We studied empirically the impacts of High Performance Work System on the organizational performances composing of turnover rate and labor productivity as well as the moderating effects of the automation level on the relation between HPWS and performance(turnover rate, labor productivity). We analyzed the balanced workplace panel data from 2007(2nd year) to 2015(6th year) surveyed by Korea Labor Institute, The results are as follows. HPWS made a positive impact on productivity and negative impact on turnover rate as we expected, The moderating effect of automation on the relation between HPWS and productivity was found to be negative, but the moderating effect of automation between HPWS and turnover rate was not significant. Based on the results, the automation level of workplace somewhat neutralized the positive impact of HPWS on labor productivity. This moderating effect of automation means the possibility that HPWS and automation might be a substitute over the role in the workplace than complement each other. We discussed that the role of substitute might be dependent on the level of artificial intelligence technology consisting of automation. We argued that the higher AI level of automation, the substitute role of automation would be higher over the human skill supported by HPWS. Finally, we suggested the theoretical and practical implications with the limitation of this study. 현재의 경영환경은 기술의 발전으로 산업 내의 경쟁 심화와 더불어 산업 간의 경계가 모호해지고 있다. 이러한 경영환경의 시대에 기업의 경쟁우위를 확보하고, 조직의 성과를 올리기 위한 효과적인 전략과 인적자원관리의 방향에 관하여 관심이 고조되고 있다. 본 연구는 인간 숙련과 역량을 중시하는 고성과작업시스템과 이와 다소 이질적인 자동화 기술이 어떻게 상호작용하는지에 대한 주제를 분석하였다. 향후, 산업기술 발전으로 자동화 정도 수준이 인지능력을 확보한 양적 또는 질적 증가가 예상됨으로 ‘자동화 정도가 고성과작업시스템과 더불어 조직성과에 어떠한 영향을 미치는지’에 대한 주제는 앞으로 기업의 인적자원관리 정책 방향을 예측하고 결정하는 것에 크게 기여할 수 있다. 한국노동연구원 사업체 패널 자료 2차(2007년)에서 6차(2015년)까지의 패널 자료를 활용하여 고성과작업시스템이 조직성과에 미치는 영향, 고성과작업시스템과 자동화 정도의 상호작용이 조직성과에 미치는 영향에 대하여 실증적으로 분석하였다. 본 연구에서는 조직성과로써 노동생산성과 자발적 이직률 등 두 가지를 포함하였다. 분석의 결과 고성과작업시스템은 노동생산성에 정(+)적 영향을 주고 자발적 이직률에는 부(-)적 영향을 주었다. 아울러 자동화 정도와 고성과작업시스템의 상호작용변수는 노동생산성에 대해 부(-)적 영향을 주는 것으로 나타났다. 즉 자동화 정도는 고성과작업시스템이 노동생산성에 미치는 영향을 완화하는 결과를 보여주고 있다. 반면 자발적 이직률에 대한 상호작용 효과는 유의하지 않았다. 이러한 결과는 최근 급격한 기술적 환경변화에서 기업이 대응하기 위해 필요한 인적자원관리와 기술이 어떻게 조화를 이루고 균형을 이뤄야 하는지에 대한 다양한 논의를 촉발할 것이다.

An Automated Aerodynamic Analysis System in Missile Based on Open-Source Software

유강국,하정현,이상철 한국항공우주학회 2023 International Journal of Aeronautical and Space Sc Vol.24 No.3

An automated aerodynamic analysis system that predicts aerodynamic characteristics of the missile configuration at the early design stage is developed using open-source software and presented. This system consists of three modules for geometry modeling, mesh generation, and flow analysis. The missile configuration defined by Missile DATCOM is created using OpenCASCADE software. The unstructured tetrahedral mesh is generated by NETGEN software with minimal input parameters. In particular, the density-based coupled solver, TSLAeroFoam, is used to predict aerodynamic coefficients accurately in the compressible flow regime. The presented system is verified for three representative missile configurations, and the results show good agreements in aerodynamic coefficients with the experiment.

Bi-directional fault analysis of evaporator inspection system

Kang, Dae-Ki,Kang, Jeong-Jin The Institute of Internet 2012 Journal of Advanced Smart Convergence Vol.1 No.1

In this paper, we have performed a safety analysis on an automotive evaporator inspection system. We performed the bi-directional analysis on the manufacturing line. Software Fault Tree Analysis (SFTA) as backward analysis and Software Failure Modes, Effects, & Criticality Analysis (SFMECA) as forward analysis are performed alternately to detect potential cause-to-effect relations. The analysis results indicate the possibility of searching and summarizing fault patterns for future reusability.

정전복구에 대한 배전계통 상정사고 해석법

박정은(Jeong-Eun Park),김형승(Hyung-Seung Kim),최면송(Myeon-Song Choi),이승재(Seung-Jae Lee),임성일(Seong-Il Lim),현승호(Seung-Ho Hyun) 대한전기학회 2016 전기학회논문지 Vol.65 No.8

This paper identifies the issues of contingency analysis for restoration in distribution systems. Contingency analysis has been applied to transmission systems but not to distribution systems. The distribution system is different from transmission system. So it is hard to apply for existing contingency analysis to distribution system. In this paper, a new contingency analysis method for distribution systems is proposed. The proposed method is based on service restoration capability. It aims to minimize outage left after service restoration in case of a fault in advance. The method estimates the vulnerability which is represented by zone restoration index proposed in. Applying the proposed method, operators could change the system so that it does not leave any outage left after restoration. Case study has been carried out on a five feeder system and its results show effectiveness of the method.

Development on unmanned automated system at hot Forging work

Sung-Ho Jung(정성호),Jun-Ho Lee(이준호) 한국기계가공학회 2013 한국기계가공학회지 Vol.12 No.5

The objective of this study is to replace labor intensive forging processes by an automated system. For achieving it, an exclusive mechanism that consists of a positioner, an arm, and a hanger is configured to handle hot forging objects. Also, a structural analysis is applied to the horizontal motion unit, which is the most highly loaded, in order to verify its validity. In addition, its possibility is also verified through identifying the performance of the proposed system before applying it to sites. As a result, the major characteristic items, such as positioning accuracy, material diameter, object traveling weight, product failure rate, and forging process rate, in this system are perfectly verified for applying it to manufacturing sites.

치과에서 디지털 x-선 영상의 이용

김은경 大韓口腔顎顔面 放射線學會 1999 Imaging Science in Dentistry Vol.29 No.2

In dentistry, RadioVisioGraphy was introduced as a first electronic dental x-ray imaging modality in 1989. Thereafter, many types of direct digital radiographic system have been produced in the last decade. They are based either on charge-coupled device(CCD) or on storage phosphor technology. In addition, new types of digital radiographic system using amorphous selenium, image intensifier etc. are under development. Advantages of digital radiographic system are elimination of chemical processing, reduction in radiation dose, image processing, computer storage, electronic transfer of images and so on. Image processing includes image enhancement, image reconstruction, digital subtraction, etc. Especially digital subtraction and reconstruction can be applied in many aspects of clinical practice and research. Electronic transfer of images enables filmless dental hospital and teleradiology/teledentistry system. Since the first image management and communications system(IMACS) for dentomaxillofacial radiology was reported in 1992. IMACS in dental hospital has been increasing. Meanwhile, researches about computer-assisted diagnosis, such as structural analysis of bone trabecular patterns of mandible, feature extraction, automated identification of normal landmarks on cephalometric radiograph and automated image analysis for caries or periodontitis, have been performed actively in the last decade. Further developments in digital radiographic imaging modalities, image transmission system, imaging processing and automated analysis software will change the traditional clinical dental practice in the 21st century.(J Korean Oral Maxillofac Radiol 1999;29:387-396)