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Mutual cognition consists of two functions: \u2019RS Cognition\u2019 and \u2019DS Cognition\u2019. This paper examines RS Cognition, which consists of many software functions for perceiving various situations like events or humans\u2019 activities in RS. The authors develop two perceptual functions, sitting posture recognition and human\u2019s location estimation for a person, as RS perception tasks. 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