Origin [edit]. The systematic use of belt color to denote the rank was first used by Kano Jigoro, the founder of judo, who first devised the colored belt system using obi (sash), and awarded the first black belts to denote a Dan rank in the 1880s. Previously, Japanese Koryu instructors tended to provide certificates.
Everything for a safe and comfortable trip. Air safety is the theory, investigation, analysis, and categorization of flight failures (aircraft incidents and accidents), and the prevention of such failures through regulation, education and training.
Airway resistance testing evaluates airway responsiveness, and includes provocation testing (e.g., bronchial challenge), evaluation of sites of airflow resistance or closures, and characterisation of the type of lung disease. Airway resistance is increased, either focally or globally, in asthma, COPD, and in smokers.