So , by the end of 1980s , relatively few scholars accepted the theory of factor proportions and comparative advantage as an adequate explanation of the observed patterns of trade 這些新現象引發了人們對傳統貿易理論的反思。 20世紀70年代末以來,國際經濟學家開始提出一些新的理論來解釋日趨復雜的國際貿易。
Because observing patterns to be recognized from multiple sensors can well and truly reflect the features of them , eliminate the uncertainty of the information . pattern recognition methods based on information fusion have already been one of the development trends of pattern recognition field 從多傳感器視角觀察待識別模式能夠完整準確的反映模式特征,消除觀察信息的不確定性,因此,基于信息融合的模式識別方法已成為模式識別的發展趨勢之一。
We also examine the performance of this simple test under a variety of biologically realistic conditions , develope a monte carlo procedure to test the homogeneity of the observed patterns , and compare it to kumar and gadagkar ' s test by computer simulation as well as empirical data analysis 我們在各種不同的生物學條件下檢查了這個檢測的效能,發展了一個montecarlo方法來檢測觀察到模型的同質性,并通過計算機模擬和真實數據的分析,比較我們的卡方檢測與kumarandgadwtar的id檢測之間的效能差異。