It is an objective quantitative expression of the amount of information contained in a message when it is received. Hartley (Ralph Vinton Lyon Hartley 1888-1970) defined the amount of information as the logarithm of the number of uncertainties. In other words, when there are K types of characters, he defined the amount of information of one character as log K. Therefore, the amount of information of a message of length n is n log K. Shannon (Claude Elwood Shannon 1916-2001) introduced the probability of occurrence of characters and defined the amount of information of one character as entropy. [Reference] Source: Dictionary of Library and Information Science, 4th Edition Dictionary of Library and Information Science, 5th Edition About Information | |
一つの通報を受け取ったときに,その通報の中に含まれる情報の量を客観的な数量で表現したもの.ハートレー(Ralph Vinton Lyon Hartley 1888-1970)は,情報量を不確実さの数の対数として定義した.すなわち,文字の種類がKであるとき,1文字の情報量をlog Kと定義した.したがって,長さnの通報の情報量は,nlogKとなる.シャノン(Claude Elwood Shannon 1916-2001)は,文字の生起確率を導入して1文字の情報量をエントロピーで定義した.[参照項目] 出典 図書館情報学用語辞典 第4版図書館情報学用語辞典 第5版について 情報 | |
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