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本論文はモデル選択とその発展系であるモデル平均（model...

In this paper, we first develop a model of an international oligopolistic Cournot industry in which firms trade core goods and their incompatible accessories. We then examine some issues concerned with dumping. We find that such firms set the core goods price below cost (below-cost dumping,...

本稿では, Partition からのreduction によって近似率を導出した事例を三つ, 紹介するとともに, それら事例をもとに, 若干の考察を加える.

頂点被覆は, NP 困難な組合せ最適化問題ゆえに, 多項式時間では解き得ないと考えられている. 他方, 頂点被覆にはいくつかの近似解法が提案されている. これら近似解法には, 大きく分けて二種類, 即ち,...

The classical binary knapsack problem has numerous generalisations in relation to not only a capacity constraint but also an objective function. In 2006, two knapsack problems have coincidentally been proposed, both of which have an extension of the objective function paying the penalty. This...