By analyzing the existing prefix-tree data structure, an improved pattern tree was introduced for processing new transactions. It firstly stored transactions in a lexicographic order tree and then restructured the tre...By analyzing the existing prefix-tree data structure, an improved pattern tree was introduced for processing new transactions. It firstly stored transactions in a lexicographic order tree and then restructured the tree by sorting each path in a frequency-descending order. While updating the improved pattern tree, there was no need to rescan the entire new database or reconstruct a new tree for incremental updating. A test was performed on synthetic dataset T1014D100K with 100 000 transactions and 870 items. Experimental results show that the smaller the minimum sup- port threshold, the faster the improved pattern tree achieves over CanTree for all datasets. As the minimum support threshold increased from 2% to 3.5%, the runtime decreased from 452.71 s to 186.26 s. Meanwhile, the runtime re- quired by CanTree decreased from 1 367.03 s to 432.19 s. When the database was updated, the execution time of im- proved pattern tree consisted of construction of original improved pattern trees and reconstruction of initial tree. The experiment results showed that the runtime was saved by about 15% compared with that of CanTree. As the number of transactions increased, the runtime of improved pattern tree was about 25% shorter than that of FP-tree. The improved pattern tree also required less memory than CanTree.展开更多
Inclination of capital groups--which realize widening impact field of media-to media sector due to relationships based on interests, and relationships/dilemmata between the governing parties and the capital owners hav...Inclination of capital groups--which realize widening impact field of media-to media sector due to relationships based on interests, and relationships/dilemmata between the governing parties and the capital owners have paved the way for a unilateral media structure not hearing the voice of others/local people. It is seen that the main stream media becomes more and more under direction of capital groups. Because of the effects created by the Second World War II, also war and media relation has gain different dimensions. Together with this differentiation, a new notion was born in the field of journalism during occupation period of the lraq by the USA--Embedded Journalism This notion, called as ＂embedded journalism＂ in English can be translated as ＂yapismislik--attachment＂, ＂gomulmusluk---embeddedness＂, and ＂yamanmis-patched＂ in Turkish. In this connection, developments which have also been realized in the media economics in line with globalization process as seen all other aspects of life, changing of ownership structure in the media, and increase of concentrations, monopolization will be scrutinized in our study in addition how the fact of embedded journalism has affected the most important mission of journalism, objectivity within the framework of relations between journalism and government.展开更多
基金Supported by National Natural Science Foundation of China (No.50975193)Specialized Research Fund for Doctoral Program of Higher Education of China (No.20060056016)
文摘By analyzing the existing prefix-tree data structure, an improved pattern tree was introduced for processing new transactions. It firstly stored transactions in a lexicographic order tree and then restructured the tree by sorting each path in a frequency-descending order. While updating the improved pattern tree, there was no need to rescan the entire new database or reconstruct a new tree for incremental updating. A test was performed on synthetic dataset T1014D100K with 100 000 transactions and 870 items. Experimental results show that the smaller the minimum sup- port threshold, the faster the improved pattern tree achieves over CanTree for all datasets. As the minimum support threshold increased from 2% to 3.5%, the runtime decreased from 452.71 s to 186.26 s. Meanwhile, the runtime re- quired by CanTree decreased from 1 367.03 s to 432.19 s. When the database was updated, the execution time of im- proved pattern tree consisted of construction of original improved pattern trees and reconstruction of initial tree. The experiment results showed that the runtime was saved by about 15% compared with that of CanTree. As the number of transactions increased, the runtime of improved pattern tree was about 25% shorter than that of FP-tree. The improved pattern tree also required less memory than CanTree.
文摘Inclination of capital groups--which realize widening impact field of media-to media sector due to relationships based on interests, and relationships/dilemmata between the governing parties and the capital owners have paved the way for a unilateral media structure not hearing the voice of others/local people. It is seen that the main stream media becomes more and more under direction of capital groups. Because of the effects created by the Second World War II, also war and media relation has gain different dimensions. Together with this differentiation, a new notion was born in the field of journalism during occupation period of the lraq by the USA--Embedded Journalism This notion, called as ＂embedded journalism＂ in English can be translated as ＂yapismislik--attachment＂, ＂gomulmusluk---embeddedness＂, and ＂yamanmis-patched＂ in Turkish. In this connection, developments which have also been realized in the media economics in line with globalization process as seen all other aspects of life, changing of ownership structure in the media, and increase of concentrations, monopolization will be scrutinized in our study in addition how the fact of embedded journalism has affected the most important mission of journalism, objectivity within the framework of relations between journalism and government.
