{'fraction_non_alphanumeric': 0.0165016501650165, 'fraction_numerical': 0.0033003300330033004, 'mean_word_length': 5.1938775510204085, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
Research on the p-Center Location Problem Based on Service-Oriented Logistics Strategy

This paper begins with an introduction of the concepts of logistics strategy and graph center. Then, for the service oriented logistics strategy, it abstracts the location problem of multi distribution centers in large scale distribution network as a p center problem of graph, and proves that both vertex p center problem and absolute p center problem have the vertex solution with 2 degree of approximation. Finally, based on the theorem, a polynomial 2 approximation algorithm for the location problem is presented.