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Yangho Park(박양호),Hyoung Seok Kang(강형석),Jun Kim(김준),SangSu Choi(최상수),Ju Yeon Lee(이주연) (사)한국CDE학회 2020 한국CDE학회 논문집 Vol.25 No.3
This paper introduces a digital-twin testbed in a cyber-physical, manufacturing-systems environment. The physical environment is based on a customized manufacturing line that includes a 3D printer, a machine tool, an inspection machine, a robot handler, and a buffer. The cyber environment of this testbed includes a 3D visualization of the line and several data-analytics models. The digital twin testbed is implemented by connecting the physical environment with the cyber environment via two types of the interfaces. The resulting integrated testbed can be a useful instrument when manufacturing engineers implement cyber physical systems for the first time their smart factories.
급성메탄올중독사고, 왜 발생했으며, 그 대책은 무엇인가?
박정선 ( Jungsun Park ),김양호 ( Yangho Kim ),김수근 ( Soo Geun Kim ),박종식 ( Jong-shik Park ),한보영 ( Boyoung Han ),정은교 ( Eun Kyo Chung ) 한국산업보건학회 (구 한국산업위생학회) 2016 한국산업보건학회지 Vol.26 No.4
Objectives: Acute methanol poisonings known to be typical occupational diseases occurring in developing countries broke out in sub-contract manufacturers in the early 2016. The present paper attempted to identify underlying causes which hide under apparent findings, and suggest alternative policies to prevent recurrence of similar intoxication Methods: We evaluated occupational health and safety characteristics of workers in micro-enterprises similar to workplaces with methanol poisoning by in depth-interview of employers, workers, and labor inspectors, and literature review. Results: The common findings of workplaces with methanol poisoning were addressed; First, the victims were illegal agency workers. Second, the workplaces were sub-contract micro-manufacturers with less than 5 employees. Investigators found that local ventilations did not work, while most of workers did not wear any proper personal respiratory protective equipment in the workplace. In addition, periodic environmental monitoring and medical check-ups were not done. However, these apparent findings do not appear to be root causes of methanol poisoning. Our in depth-analysis clarified a root cause; micro-enterprises with less than 5 employees are exempted with essential regulations of OSH Act, and employers do not know about OSH Act. Conclusions: We suggest occupational health policies to prevent recurrence of similar intoxication; First, government should introduce programs so that all employers should know about employers` responsibilities in OSH Act from the start of business. Second, even manufacturers with less than 5 employees should not be exempted with essential regulations of OSH Act. Finally, employers should take responsibilities for health and safety of all the workers including agency workers working in workplaces.
자동차 차체공장의 공간/물류 통합 분석 시뮬레이션에 관한 연구
Li Quan Ri,박양호(Yangho Park),노상도(Sang Do Noh),전유빈(Yu Bin Jeon) (사)한국CDE학회 2012 한국 CAD/CAM 학회 학술발표회 논문집 Vol.2012 No.2
The core competency of a manufacturing company is the ability of “Front-Loading”, the ability of minimizing the cost incurred after producing products and the ability of minimizing the change of production process under change of products through putting as many jobs in prior to the mass production as possible. One way for achieving such paradigm is designing the layout of factory and conducting the material flow analysis on the basis of the layout for optimization of material flow through selecting the optimized alternative. However, in real industries, workers are planning the design of layout and material flow under their empirical knowledge. Problems in such planning are that the plan is lack of reliability and that it is hard to be accepted by the other department when they have disagreements of opinion since the plan is hard to be said that it is objective. In this research, the modeling-and-simulation-based material flow analysis is conducted and derived the optimized alternative through what-if alternative analysis for capturing objectivity and for overcoming problems mentioned ahead, and proposed an integrated area/material-flow analysis system for achieving the manufacturing front-loading.
스마트 제조를 위한 클라우드 플랫폼 기반 사용자 친화적인 디지털 트윈 구축 방법
최상수(SangSu Choi),우정엽(Jungyub Woo),박양호(Yangho Park),송인호(Inho Song) 대한기계학회 2021 大韓機械學會論文集A Vol.45 No.2
스마트 제조 시대의 도래로 선진국과 글로벌 제조 기업들을 중심으로 스마트 공장을 활발히 구축하고 있다. 디지털 트윈은 진보된 형태의 스마트 공장 구축을 가능하게 하는 미래 핵심 기술이다. 디지털 트윈 기반 스마트 공장은 (1) 실제 공장과 동일한 디지털 공장을 모델링하고, (2) 물리적 공장과 디지털 공장을 연결하며, (3) 시뮬레이션, 인공지능과 같은 분석 기술들로 예측하고, (4) VR/AR을 통해 직접 체험하며 빠른 의사결정을 통해 물리적 공장을 제어하는 절차로 구축된다. 디지털 트윈은 전문가 의존도가 매우 높은 기술이며, 구축에 많은 시간과 비용이 소요된다. 본 논문에서는 전문가뿐만 아니라 초보자들도 쉽고 빠르게 디지털 트윈을 구축이 가능한 클라우드 기반 디지털 트윈 플랫폼을 소개한다. 다양한 제조기업들의 구축 사례들에 대해 설명하고, 그 효과를 분석했다. With the advent of the smart manufacturing era, advanced countries and global manufacturing enterprises are actively building smart factories. Digital twin (DT) is the future key technology that enables the building of advanced smart factories. DT-based smart factories are built by following procedures that consist of (1) modeling a digital factory that is identical to the physical factory, (2) connecting the physical factory and digital factory, (3) predicting using analysis techniques, such as simulation and artificial intelligence, and (4) controlling the physical factory through quick decision-making based on direct experience using virtual or augmented reality. DT is a technique in which experts are heavily relied upon, and it takes much time and costs to develop DT. In this paper, we introduce a cloud-based DT platform that enables novices and experts to build DT quickly and easily. Cases applicable to various manufacturing companies were described, and the effects were analyzed.
제조라인 통합 설계 및 분석(I) - 디지털 가상생산 기술 적용을 위한 모델링 & 시뮬레이션 자동화 시스템
최상수(SangSu Choi),현정호(Jeongho Hyeon),장용(Yong Jang),이범기(Bumgee Lee),박양호(Yangho Park),강형석(HyoungSeok Kang),전찬모(Chanmo Jun),정진우(Jinwoo Jung),노상도(Sang Do Noh) (사)한국CDE학회 2014 한국CDE학회 논문집 Vol.19 No.2
In manufacturing companies, different types of production have been developed based on diverse production strategies and differentiated technologies. The production systems have become smart, factories are filled with unmanned manufacturing lines, and sustainable manufacturing technologies are under development. Nowadays, the digital manufacturing technology is being adopted and used in manufacturing industries. When this technology is applied, a lot of efforts, time and cost are required and training professionals in-house is limited. In this paper, we introduce e-FEED system (electronic based Front End Engineering and Design) that is the integrated design and analysis system for optimized manufacturing line development on virtual environment. This system provides the functions that can be designed easily using library and template based on standardized modules and analyzed automatically the logistic and capacity simulation by one-click and verified the result using visual reports. Also, we can review the factory layout using automatically created 3D virtual factory and increase the knowledge reuse by e-FEED system.
웹 2.0 기반의 공정 모델링과 생산 시뮬레이션 연계에 관한 연구
진유의(Yooeui Jin),조문빈(Wen-Bin Zhao),이언(En Lee),정선화(Sunhwa Jung),임수민(Soomin Lim),박양호(Yangho Park),강형석(Hyungseok Kang),이주연(Jooyun Lee),정연경(Yunkyong Jung),노상도(Sang Do Noh),조현제(HyunJei Jo),조용주(YongJu Cho) (사)한국CDE학회 2011 한국 CAD/CAM 학회 학술발표회 논문집 Vol.2011 No.1
According to society has been using information technology and product life cycle has been extremely shorter, the way to satisfy variety demands from customer has become most important issues in manufacturing companies. In order to satisfy various customer demands, it is essential that time to market for new product is reduced by the reduction of product development time and cost, and the increase of product quality. Simulation is one of the core task in manufacturing engineering and it can be a solution to reduce the product development duration within complex environment. But, to implement simulation, there is a difficulty in making simulation model. Besides, in most simulation softwares, process model is so dependent on its simulation model that reuse of simulation model is not easy. Therefore, in this study, we defined an information scheme of process and simulation model. And we developed web based process modeling and manufacturing simulation system.