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공정간 시간 제약을 가지는 Wafer Lot의 대기 시간 예측
이기한(Gi Han Lee),천상욱(Sang uk Cheon),박상철(Sang Chul Park) (사)한국CDE학회 2020 한국CDE학회 논문집 Vol.25 No.4
This paper proposes a machine learning based method to predict the ‘queue-time’ of a target lot with time-constraints among processing steps. Since time-constraints among processing steps exist for quality assurance, it is very important to meet the time-constraints in Fab operations. To do so, we need to have an accurate prediction model for the ‘queue-time’ of a target lot. This paper identifies two categories of predictor variables; 1) work-in-process related variables, and 2) dispatching rule related variables. Since the quality of the prediction model depends on the quality of predictor variables, we need to carefully select predictor variables by considering their explanatory powers and multi-collinearities among them. In this paper, we employ the genetic algorithm for the section of best predictor variables. The prediction model is a fully-connected deep learning model, and the demonstration shows the performance of the model.
김은영 ( Eun-young Kim ),이기한 ( Gi-han Lee ),장중순 ( Jung-sun Jang ),박상철 ( Sang-cheol Park ) 대한설비관리학회 2018 대한설비관리학회지 Vol.23 No.3
This paper proposes a methodology for the effective maintenance planning of traffic signal controllers, which are important for the safety of vehicles and pedestrians. For the effective maintenance planning, it is necessary to estimate the lifespan of a traffic signal controller. Since a traffic signal controller operates outdoors, the lifespan depends on the environmental factors including temperature, humidity, and salinity. We devise a deep learning model to estimate the lifespan of a traffic signal controller by using environmental conditions. The proposed maintenance planning methodology computes the optimal maintenance period which provides the lowest maintenance cost.
CARLOS TC를 적용한 Trailer coupling의 Multi-axial durability test 방법
강수연(Sooyeon Kang),이기(Gi Lee),임재철(Jaechul Yim),한교진(Kyojin Han) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
The trailer coupling device of passenger car has to be passed safety and durability test requirements for customer’s satisfaction. To meet the requirements, trailer coupling device test with a car is essential. Many car manufacturers perform this car test which may cause expensive improvements, time-consuming and long development times. Naturally, developing an alternative method is required and Multi-axial durability test method of Trailer coupling device by applying CARLOS TC can be a smart solution for that.