Limited human attention resources produce cognitive load and so critical human error. In particular, the case of large-scale systems due to human error from the limited attention resources had often very large accidental damage. Recent disaster of Fukushima Daiichi nuclear power plant is a typical example. Display design method to reduce the cognitive load has been studied in the area of Ecological Interface Design (EID). EID method proposed Work Domain Analysis (WDA) for understanding work domain constraints. Using WDA method, it analyzed Steam Generator and Pressurizer Water Level control process design of digitalized Main Control Room.

This paper deals with a first-come, first-served qucueing model to analyze the behavior of heterogeneous finite source system with a single server. Each sources and the processor are assumed to operate in independently Markovian environments, respectively

This paper deals with the evaluation problem of complex systems by introducing a fuzzy approach. The authors are functionally supposing a hierarchical structure model of a complex system and give light on the following problems. First for the purpose of clarifying the characteristics of measures the property and differences between two method such as linear and fuzzy viewpoint are discussed through two level-down evaluation process. Second the integrated evaluation process which keeps reversibility between hierarchical levels is discussed and obtained some necessary conditions for reversibility of fuzzy evaluation. From these results it is expected that the fuzzy approach overcomes partly the limitation of reductionism at the hierarchical evaluation of complex systems.