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Evolutionary Algorithm for Process Plan Selection with Multiple Objectives
MOON, Chiung,LEE, Younghae,GEN, Mitsuo Korean Institute of Industrial Engineers 2004 Industrial Engineeering & Management Systems Vol.3 No.2
This paper presents a process plan selection model with multiple objectives. The process plans for all parts should be selected under multiple objective environment as follows: (1) minimizing the sum of machine processing and material handling time of all the parts considering realistic shop factors such as production volume, processing time, machine capacity, and capacity of transfer device. (2) balancing the load between machines. A multiple objective mathematical model is proposed and an evolutionary algorithm with the adaptive recombination strategy is developed to solve the model. To illustrate the efficiency of proposed approach, numerical examples are presented. The proposed approach is found to be effective in offering a set of satisfactory Pareto solutions within a satisfactory CPU time in a multiple objective environment.
표준 치아 크기 및 배열 정보를 이용한 다중 치아 임플란트식립계획 방안
박형욱,박상진,박형준 한국CDE학회 2015 한국CDE학회 논문집 Vol.20 No.4
It is important to devise methods for assisting dentists to consistently determine implant positions and directions and to accurately perform drilling tasks during dental implant surgery. In this paper, we propose a novel approach to tooth implant placement planning which deals with the determination of the positions and directions of multiple implant fixtures for a set of missing mandibular teeth and suggests the selection of the sizes and types of the implant fixtures. We combine Korean standard data in the sizes and positions of human teeth with the patient specific 3D models of mandibular jawbones, nerve curves, and neighboring teeth around the missing teeth in order to determine the positions and directions of the implant fixtures for the missing teeth. Using the geometric and spatial information of the jawbones, the teeth and the implant fixtures, we can construct the 3D models of surgical guide stents which are crucial to perform drilling tasks with ease and accuracy. Adopted in 3D simulation of dental implant placement, the approach can provide surgeon students with good educational contents. We also expect that, with further work, the approach can be used as a useful tool to plan for dental implant surgery.
Priority Scheduling for a Flexible Job Shop with a Reconfigurable Manufacturing Cell
Doh, Hyoung-Ho,Yu, Jae-Min,Kwon, Yong-Ju,Lee, Dong-Ho,Suh, Min-Suk Korean Institute of Industrial Engineers 2016 Industrial Engineeering & Management Systems Vol.15 No.1
This paper considers a scheduling problem in a flexible job shop with a reconfigurable manufacturing cell. The flexible job shop has both operation and routing flexibilities, which can be represented in the form of a multiple process plan, i.e. each part can be processed through alternative operations, each of which can be processed on alternative machines. The scheduling problem has three decision variables: (a) selecting operation/machine pairs for each part; (b) sequencing of parts to be fed into the reconfigurable manufacturing cell; and (c) sequencing of the parts assigned to each machine. Due to the reconfigurable manufacturing cell's ability of adjusting the capacity, functionality and flexibility to the desired levels, the priority scheduling approach is proposed in which the three decisions are made at the same time by combining operation/machine selection rules, input sequencing rules and part sequencing rules. To show the performances of various rule combinations, simulation experiments were done on various instances generated randomly using the experiences of the manufacturing experts, and the results are reported for the objectives of minimizing makespan, mean flow time and mean tardiness, respectively.
Priority Scheduling for a Flexible Job Shop with a Reconfigurable Manufacturing Cell
Hyoung-Ho Doh,Jae-Min Yu,Yong-Ju Kwon,Dong-Ho Lee,Min-Suk Suh 대한산업공학회 2016 Industrial Engineeering & Management Systems Vol.15 No.1
This paper considers a scheduling problem in a flexible job shop with a reconfigurable manufacturing cell. The flexible job shop has both operation and routing flexibilities, which can be represented in the form of a multiple process plan, i.e. each part can be processed through alternative operations, each of which can be processed on alternative machines. The scheduling problem has three decision variables: (a) selecting operation/machine pairs for each part; (b) sequencing of parts to be fed into the reconfigurable manufacturing cell; and (c) sequencing of the parts assigned to each machine. Due to the reconfigurable manufacturing cell’s ability of adjusting the capacity, functionality and flexibility to the desired levels, the priority scheduling approach is proposed in which the three decisions are made at the same time by combining operation/machine selection rules, input sequencing rules and part sequencing rules. To show the performances of various rule combinations, simulation experiments were done on various instances generated randomly using the experiences of the manufacturing experts, and the results are reported for the objectives of minimizing makespan, mean flow time and mean tardiness, respectively.
표준 치아 크기 및 배열 정보를 이용한 다중 치아 임플란트 식립계획 방안
박형욱(Hyung-Wook Park),박상진(Sang-Jin Park),박형준(Hyungjun Park) (사)한국CDE학회 2013 한국 CAD/CAM 학회 학술발표회 논문집 Vol.2013 No.1
최근 의료영상 기반 3D 데이터가 임플란트 시술계획 수립에 널리 활용하고 있으나 식립 위치와 방향 선정의 경우 시술자의 경험 및 주관적 판단에 의존되어 시술자 간 상당한 편차가 존재한다. 본 논문에서는 한국인 표준모델을 토대로 얻어진 하악 치아들의 크기 및 배열 정보를 환자에 따른 식립 부위 주변 치아 및 구강 정보와 접목하여 다중 임플란트 식립 위치 및 방향을 결정하고, 이를 바탕으로 임플란트 크기 및 유형을 선정하는 방안을 제안한다. 얻어진 식립정보를 이용하여 식립보조도구(surgical stents)의 3D 모델을 생성할 수 있으며, 치아 임플란트 시술용 교육 컨텐츠로 활용될 수 있고, 식립계획 수립을 위한 유용한 정보로 활용될 수 있다.
표준 치아 크기 및 배열 정보를 이용한 다중 치아 임플란트 식립계획 방안
박형욱(Hyung-Wook Park),박상진(Sang-Jin Park),박형준(Hyungjun Park) (사)한국CDE학회 2015 한국CDE학회 논문집 Vol.21 No.2
It is important to devise methods for assisting dentists to consistently determine implant positions and directions and to accurately perform drilling tasks during dental implant surgery. In this paper, we propose a novel approach to tooth implant placement planning which deals with the determination of the positions and directions of multiple implant fixtures for a set of missing mandibular teeth and suggests the selection of the sizes and types of the implant fixtures. We combine Korean standard data in the sizes and positions of human teeth with the patient specific 3D models of mandibular jawbones, nerve curves, and neighboring teeth around the missing teeth in order to determine the positions and directions of the implant fixtures for the missing teeth. Using the geometric and spatial information of the jawbones, the teeth and the implant fixtures, we can construct the 3D models of surgical guide stents which are crucial to perform drilling tasks with ease and accuracy. Adopted in 3D simulation of dental implant placement, the approach can provide surgeon students with good educational contents. We also expect that, with further work, the approach can be used as a useful tool to plan for dental implant surgery.