How to implement magento cron on yii

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* Geterate tasks schedule
* Cleanup tasks schedule
*
*/

//SystemConfig::getValue('success_history_lifetime') = 200;
//SystemConfig::getValue('failure_history_lifetime') = 200;
//SystemConfig::getValueIndex('history_cleanup_every')= 10;
//SystemConfig::getValue('missed_if_not_run_within') = 10;
//SystemConfig::getValue('generate_schedules_every') = 15;
//SystemConfig::getValue('schedule_ahead_for') = 50;

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