This paper describes the evaluation methods for posture analysis of materials handling in transportation and distribution with vehicle routing. Working postures are expressed with transition matrix and diagram. Signal flow graph and linear equations are also used to express the working posture. To evaluate the working posture, we proposed the fuzzy information theory. The measurements of working posture are evaluated with entropy from information theory. It is very easy to evaluate the materials handling posture. Fuzzy clustering techniques are used to classify the working postures in materials handling. Hierarchic classifications can be represented by the dendrogram which illustrates the fusions or divisions for working posture. Here is shown the relationship between fuzzy posture information theory and fuzzy cluster analysis.
Hybrid scheduling for the production system including both of parts machining and assembly operations is studied. Several products of different kind are ordered to make and parts for the products are manufactured in the flow-shop consisting of multiple machines. Each product is produced by hierarchical assembly operations from the parts, that is, some parts are assembled into the first sub-assembly and some other parts and the first sub-assembly are assembled into the second sub-assembly, and so forth. In this paper, the problem to obtain a schedule having minimum weighted sum of completion time of each product is introduced. A technique to gain better lower bound and a calculation procedure using branch and bound method are developed to get an optimum or near-optimum schedule. Meaning and validity of the model are clarified by a numerical example and effectiveness of the proposed calculation procedure is shown by several computational experiments.
This paper treats the effect and limit of practical use of information in multi-echelon inventory system with periodical replenishment. That is, we consider a case when the replenishing volume in every inventory stage is determined using the demand information without delay (a parallel type), and comparing it with conventional case (a series type), to get the following results. When the demand distribution is stationary, the average inventory volume of the parallel type is equivalent to that of the series type, and when the demand distribution changes, the parallel type is superior to the series type in adaptation. We make it clear and formalize the reason. We also propose an adaptive inventory system reflecting the change of demand distribution, and verify the effectiveness. Finally, we point out the importance of simplification of the structure by showing the decreasing rate of the inventory when inventory stage gets fewer from 3 to 2.
Kanban system is known as one of the most effective production control systems for multi-stage manufacturing processes. There has been much research into the method of applying such a system. However, these studies use the throughput and work-in-process (WIP) level to measure the system performance, and do not take account of storage space. We propose a nested kanban controlled production system with multi-kanban loop. This is capable of balancing the WIP and inventory space under the same productivity. This system is a generic kanban system which includes previous kanban system and the CONWIP system. Finally, the effects of balancing the maximum WIP level and total storage space is showed using simulation.
We propose a determination method to cut and disassemble a product into parts or units in consideration of the connection among inside parts and units. Firstly a surface expansion diagram is made to show the structure of all parts and units from the assembly drawing of 3-D CAD. This diagram shows the fixed position, condition between a surface and parts, and information of the material, size, dangerous substance and so on of the parts to classify for recycling. Secondly a surface connection diagram is made to show the connection between the surfaces and the parts that join two surfaces together. This diagram is used for judging a subset of surfaces that are joined by inside parts that are impossible to cut through the surface. Thirdly the criteria for cutting order are determined from the surface expansion diagram and the surface connection diagram in consideration of the sort of material and the joint parts.
A hierarchical structure was proposed in multi-objective evaluation (ex. AHP). But, in the real world, there are many cases where it is difficult to make a hierarchical structure, because the decision-maker cannot understand the problem clearly. In theses cases, it is necessary to support making hierarchical structure in order to let the decision-maker recognize objects of the problem's evaluation and relationships between objects. This paper proposes the method of making hierarchical structure of objects using structural modeling.
The vending machine promotes automation of sale, saving of sale staff, extension of sale time, expansion of sale base. But, in the troubleoutbreak quick correspondence of repayment handling doesn't completed. The people keep away using vending machine from a fall of reliability. It is expected that the people will change of behavior. By this studies presence of various trouble experience we investigate influence for decision making in using vending machine. We lead evaluation standard data for improvement of reliability into the machinery development of future. We did questionnaire investigation about presence of trouble. As a result, we report the tendency that was found every attribute.