• Title/Summary/Keyword: material handling

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Performance Analysis of the Flexible Manufacturing System According to the Strategy of Material Handling System Using Moment Generating Function Based Approach (모멘트 생성 함수 기법을 이용한 물류 운반 시스템 이용에 따른 유연 생산 시스템의 성능 해석)

  • 양희구;김종원
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 1995.10a
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    • pp.1186-1190
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    • 1995
  • This paper is focused on the formulation of explicit closed-form functions describing the performance measures of the general flexible manufacturing system (FMS)according to the strategy of material handling system(MHS). the performance measures such as the production rate, the production lead-time and the utilization rate of the general FMS are expressed, respectively, as the explicit closed-form functions of the part processing time, the service rate of the material handling system (MHS) and the number of machine tools in the FMS. For this, the gensral FMS is presented as a generalized stochastic Petri net model, then, the moment generating function (MGF) based approach is applied to obtain the steady-state probabity formulation. Based on the steady-state formulation, the explicit closed-form functions for performance measures of the probability FMS can be obtained. Finally, the analytical results are compared with the Petri net simulation results to verify the validity of the suggested method. The paper is of significance in the sense that it provides a comprehensive formula for performance measures of the FMS even to the industry engineers and academic reademic resuarchers who have no background on Markov chain analysis method or Petrinet modeling

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The Status of Material Handling Industry and the Scheme of Development (운반하역기계 산업의 현황과 발전 방안)

  • 신용하;조영준;손병진
    • Journal of Korean Society of Industrial and Systems Engineering
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    • v.15 no.26
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    • pp.1-11
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    • 1992
  • Material Handling equipments such as hoists, cranes, storage and retrieval machines, gantry robots and conveyors are carrying out more important tasks in material flow automation field. This paper is concerned with the characteristic and the position of this industry, and presents the status of the business world scale, supply and demmand. import and export transition, and directing posts of the profits. Also it gives productivity security and activity.

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Psychophysical Study of Combined Manual Material Handling Tasks (결합된 수동물질취급 작업에서의 인체심리학적 연구)

  • 윤훈용
    • Journal of Korean Society of Industrial and Systems Engineering
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    • v.22 no.50
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    • pp.65-73
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    • 1999
  • Most psychophysical studies in manual material handling (MMH) have paid more attention to two-handed MMH activities than to one-handed MMH activities. Also, studies are involved only with single MMH activities - lifting, lowering, carrying, holding, pushing or pulling. Very few studies are reported on the determination of workers' capacities for combinations of one-handed MMH activities (lifting a box, then carrying the box, and lowering the box). The objective of this study was to find the psychophysical and physiological responses of human subjects from a simulated industrial task involving one-handed and two-handed combined tasks. The capacities that were determined as the maximum acceptable weight workloads for 1 hr work period for one-handed and two-handed combined tasks - lifting a box from floor to knuckle height, carrying the box for 4.3 m, and lowering the box from knuckle to floor height - were determined psychophysically under three frequencies: six handlings per minute, one handling per minute and one handling per five minutes. In addition to maximum acceptable weight, heart rate and RPE values on wholebody, back, and arm were also measured as responses.

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A Material Handling Performance Evaluation Model for Cellular Manufacturing System of Based on Multi-Attributes Analysis Method (다 속성분석방법을 이용한 제조물류시스템의 성능산정모델)

  • 황홍석
    • Proceedings of the Korean Operations and Management Science Society Conference
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    • 2000.10a
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    • pp.167-170
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    • 2000
  • This paper is concerned with development of a performance evaluation model for material handling system in cellular manufacturing system based on multi-attributes analysis method. We used the AHP(analytic hierarchy process) and fuzzy set ranking methodologies to overcome the special decision problems; those of multi -objective, multi-criterion, and multi-attributes. We proposed a 3-step approaches and we developed a systemic and practical computer program to solve the problems in the proposed methods. Computational experiments are then performed to cellular manufacturing system and show the effectiveness of the proposed model.

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Development of a material handling automation simulation using a virtual AGV (가상 AGV를 이용한 물류자동화 시뮬레이션 개발)

  • Ro, Young-Shick;Kang, Hee-Jun;Suh, Young-Soo
    • Proceedings of the KIEE Conference
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    • 2006.10c
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    • pp.563-566
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    • 2006
  • In this paper, we studied about AGVs modeling and material handling automation simulation using a virtual AGV. The proposed virtual AGV model that operates independently each other is based on a real AGV. Continuous straight-line and workstation model using vector drawing method that could easily, rapidly work system modeling are suggested. Centralized traffic control, which could collision avoidance in intersection and should not stop AGV as possible, and algorithm for detour routing which performs when another AGV is working in pre-routed path are proposed. The traffic control and the algorithm have been proved efficiently by simulation.

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Development of Design and Analysis System for Material Handling Cranes (운반하역 크레인의 설계해석 자동화 시스템 개발)

  • 임동준;박정연;이충동
    • Proceedings of the Computational Structural Engineering Institute Conference
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    • 1999.10a
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    • pp.153-159
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    • 1999
  • A material handling crane is composed of many complex structural components which require sufficient strength, stiffness and stability throughout its service life and need to be light in weight, and satisfy the required functions under the entire range of operating conditions. In this study, the analysis system for material handling cranes is presented. This program integrate various structural analyses modules with the GU(Graphic User Interface) concept. Utilizing basic variables as input data, the analysis system performs quasi-static, eigenvalue, buckling, fatigue and stability analysis. Using this program, the designer can generate optimal design data for the cranes without my actual measurements. This system will also be extended to other mechanical structures with kinematic motion like crane.

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Validation of the Control Logic for Automated Material Handling System Using an Object-Oriented Design and Simulation Method (객체지향 설계 및 시뮬레이션을 이용한 자동 물류 핸들링 시스템의 제어 로직 검증)

  • Han Kwan-Hee
    • Journal of Institute of Control, Robotics and Systems
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    • v.12 no.8
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    • pp.834-841
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    • 2006
  • Recently, many enterprises are installing AMSs(Automated Manufacturing Systems) for their competitive advantages. As the level of automation increases, proper design and validation of control logic is a imperative task for the successful operation of AMSs. However, current discrete event simulation methods mainly focus on the performance evaluation. As a result, they lack the modeling capabilities for the detail logic of automated manufacturing system controller. Proposed in this paper is a method of validation of the controller logic for automated material handling system using an object-oriented design and simulation. Using this method, FA engineers can validate the controller logic easily in earlier stage of system design, so they can reduce the time for correcting the logic errors and enhance the productivity of control program development Generated simulation model can also be used as a communication tool among FA engineers who have different experiences and disciplines.

Storage Capacity Estimation for Automated Storage/Retrieval Systems Considering Material Handling Delay (자재취급 지연을 고려한 자동창고의 저장능력 추정)

  • 조면식
    • Journal of the Korea Society for Simulation
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    • v.10 no.3
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    • pp.71-82
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    • 2001
  • Considering material handling delay which occurs between storage and processing stations, we propose an algorithm to estimate the required storage capacity, i.e., number of aisles and number of openings in vertical and horizontal directions in each aisle, of an automated storage/retrieval(AS/R) system. Due to the random nature of storage and retrieval requests, proportion of single and dual commands is not known in advance. Two design criteria, maximum permissible overflow probability and maximum allowable storage/retrieval(S/R) machine utilization, are used to compute the storage capacity. Most of studies assume that storage capacity of AS/R systems is given, although it is a very important decision variable in the design phase. Therefore, the proposed model can be effectively used in the design phase of new AS/R systems.

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The Selection of a Material Handling Systems using Multi-Attribute Decision Making (물류관리 시스템 선정을 위한 다기준 의사결정)

  • 정상윤;하승철;황문영
    • Journal of Korean Society of Industrial and Systems Engineering
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    • v.18 no.33
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    • pp.45-53
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    • 1995
  • The Purpose of this paper is to describe and demonstrate a quantitative procedure for evaluating alternative material handling systems that are being considered for possible purchase. The procedure considers both quantitative factors(i.e. costs) and qualitative factors(i.e. equipment productivity) that should be considered in the evaluation process. Since these factors are not always quantifiable it is necessary that the procedure be able to quantify all factors in commensurable units. This is accomplished via a modification of the Brown and Gibson model for facility site location and selection. The model was demonstrated via a case example that encompassed the derivation of performance measures for three material handling systems.

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Evaluation Models for the Container Handling Times of the Automated Transfer Crane in Container Terminals (컨테이너 터미널에서 자동화된 트랜스퍼 크레인의 컨테이너 취급시간을 위한 평가모형)

  • Kim, Ki-Young
    • IE interfaces
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    • v.19 no.3
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    • pp.214-224
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    • 2006
  • The container handling times of automated transfer cranes(ATCs) significantly affect the productivity of container terminals. In this paper, evaluation models for the container handling times of ATCs are suggested for import container blocks with different transfer point configurations. Firstly, evaluation models for various motion times of stacking and retrieving operations of ATC are suggested for two basic alternatives of import container blocks. In addition, in considering the space allocation, evaluation methods for the container handling times of ATC are suggested. Finally, the container handling times for each case are compared with each other in order to analyze how the block shape and the transfer point locations affect the container handling times of ATC.