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A countermeasure is a measure or action taken to counter or offset another one. As a general concept it implies precision, and is any technological or tactical solution or system (often for a military application) designed to prevent an undesirable outcome in the process. The first known use of the term is in 1923.〔(Meriam-Webster Dictionary ) "Countermeasure" defined〕 Countermeasures can refer to the following disciplinary spectrum: * Defense * Medicine * Materials engineering * Electro-magnetic engineering * Policing * Information technology * Law * Diplomatic security * Pollution prevention Defense countermeasures are often subdivided into "active" and "passive" countermeasures. ==Active== In military applications, "active" countermeasures which alter the electromagnetic, acoustic or other signature(s) of a target thereby altering the tracking and sensing behavior of an incoming threat (e.g., guided missile) are designated soft-kill measures. Measures that physically counterattack an incoming threat thereby destroying/altering its payload/warhead in such a way that the intended effect on the target is majorly impeded are designated hard-kill measures. Both are further described in active protection systems. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「countermeasure」の詳細全文を読む スポンサード リンク
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