漁船システム論 : 漁船システム挙動の決定機構

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The paper introduces an mathematic analysis in respect of the most economic and effective operations of fishing boats which have been usually managed by capabilities of fishing masters or captains based on their years of experiences. The following formula may be used for the production income, considering it as an objective function: [numerical formula] where D=Number of total days for each fishing trip i=Identification number of fishing ground t_i=Total days of fishing operations in "i" fishing ground k_i=Number of days required for navigation from a base port or preceded fishing ground to "i" fishing ground q_<oi>=Estimated catch at a beginning stage in "i" ground P_i=Estimated price of fish c_1=Expense incurred for fishing operations per day c_2=Expense incurred for navigation per day λ_i=Catch decreasing coefficient in "i" ground Then, restricting conditions are given as follows: [numerical formula] where l_i=Number of days which covers the longest period of continuous fishing operations in "i" fishing ground m_i=Number of days which covers the shortest period of continuous fishing operations in "i" fishing ground H=Total capacity of fish holds f=Stowage factor Thus, when a value of average catch per day "q_i" is estimated instead of the estimated catch at the beginning stage in the "i" fishing ground, "q_<oi>", the restricting conditions and the objective function can be simplified as follows: [numerical formula] By applying this formula to practical fishing operations, a model calculation of the production income by operational routes and fishing days is conducted and its results are shown in Table 1.
社団法人日本航海学会の論文
1974-07-31

漁船システム論 : 漁船システム挙動の決定機構

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