Nobuyoshi Fukuchi

Harmonized Transportation System to Support the Recycle-based Society

The quantity of solid waste that is finally disposed of through production, consumption and import occupies 1/4 of the whole in material balance domestically in Japan and is approximately 500 megatons per year. In recent years, because of lack of a final disposal site, outbreak of pollution with intermediate treatment of waste disposal and social problems such as illegality abandonment, to secure a waste disposal facility has become an important problem. On account of these circumstances, the solid waste is carried from the area of disposal shortage to the other area of disposal margin of intermediate treatment facilities and final disposal sites by the wide area transportation that used a highway network.To construct the recycle based society that aimed at utilizing effectively waste as resources among different industries has become an urgent need in order to reduce the quantity of whole solid waste. For the realization of the recycle-based society, it is indispensable to build a new physical distribution system between waste discharge sources such as a consuming place and an industrial area, and waste disposal areas such as a recycling factory and a final disposal site to be dotted with individually over a wide area.From these backgrounds, a concept of physical distribution system that makes use of advantages of ship transportation in order to support the recycle-based society is proposed. And as a practical example of applying the proposal concept, the industrial waste transportation by shipping is evaluated through the calculation of CO2 emissions by conducting mathematical programming model.

Threshold Curves of Quantitative Dynamic Stability of Thin Shells subjected to Follower Forces

The numerical applications of a proposed general governing equation to deal with the dynamic stability analyses of thin shell continuua defined in the monoclinically convected coordinate axes and subjected to follower forces are demonstrated. Detailed analyses of the small motions of a shell about its equilibrium positions establish the existance of an ‘instability region’ and an overall ‘threshold point of dynamic stability’ for the shell, in spite of the presence of a different static critical load.

Governing Equations for the Dynamic Stability of Thin Shells subjected to Follower Forces and some Numerical Results

A formulation of the general governing equations is proposed to deal with the finite deformations and dynamic stability analyses of thin shells defined in the monoclinically convected coordinate axes and subjected to follower forces. A numerical investigation of the problem of instability analyzes the natural frequencies at the deflected equilibrium positions of several partial shells of different curvatures, and obtains their stability characteristics.

Methodology of Making a Choice from the Plan Proposals Based on Substitutive and Complementary Evaluation

To make a choice from the plan proposals such as a sketch, a concept or personal likes are to be evaluated sometimes as a multi-sided problem which depends on the requirements and constraints placed on the decision-maker.When it is difficult to make a choice from the plan proposals by an estimation based on the principal items under evaluation, a substitutive and a complementary evaluation can be used. The former method of evaluation makes a judgement on the substitutive items or their good points under evaluation and the later method of evaluation chooses the plan that has the least number of weak points.A method for this multi-sided evaluation is proposed through the technique of management engineering applying the fuzzy measure to a preference criterion developed in this paper. As a practical example for the application of the proposed method, the problem of making a rational reduction of human hands at a mooring system is evaluated and a choice is made for the next generation mooring systems.

A Practical Method for Analyzing the Indeterminable Problems in the Design of Ship Equipments

The various factors and conditions for the design of ship equipments contain several indeterminable elements, which could often introduce a certain amount of fuzziness in the designed values. In the previous part of this paper, a method of solution to such problems was attempted by evolving a Cartesian Product Model using the Fuzzy theory. This part investigates the prediction methods for the amount of fuzziness that could be introduced by the indeterminancy of the governing factors in a strongly parameter dependent phenomenon, based upon a combination of mathematical modelling and fuzzy relationships, using a fuzzy determination model.As a practical example, the phenomenon of the incidence of ship fires and the conditions for its outburst and spread are investigated by dividing it into the flashover of the burning cell and its spread into the adjacent cells. The flashover threshold curve for the outburst of fire in a cell is determined first, and the fuzziness involved in the chances of a flashover is predicted in the threshold curve, using the fuzzy relationships. The conditions under which the fire would spread into the adjacent cells, and the range of thicknesses for the noninflammable intercell wall materials necessary to prevent that danger, are determined then by introducing the indeterminable values into the fuzzy determination model.