Principles of safety.

An injury arises from the transfer of potential or kinetic energy caused by the collision of a human with a hazardous object. Safety problems come from uncertainty involved in work space. As safety goes with information indicating safety of the work space, sampling and transmission of information on safety is indispensable as a means of proving safety. This paper presents 'principles of safety', describing (1) creation of safety, (2) continuity of safety, and (3) publication of safety. In order to achieve a safety (system) on the basis of the principles, this paper also explains that safety reporting means have characteristics of asymmetricalerror output signal generation and that the safety information to be reported must depend on the structure of the equipment involved. The asymmetricalerror rate is defined as a means of safety evaluation, and safety reporting means with asymmetricalerror characteristics are modeled as structures of a electric fuse and safety confirmation behavior.