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Dubois and Prade introduced the mean value of a fuzzy number as a closed interval bounded by the expectations calculated from its upper and lower distribution functions. In this paper introducing the notations of lower possibilistic and upper possibilistic mean values we definine the interval-valued possibilistic mean and investigate its relationship to the(More)
Since the early 1970s, decision support systems (DSS) technology and applications have evolved significantly. Many technological and organizational developments have exerted an impact on this evolution. DSS once utilized more limited database, modeling, and user interface functionality, but technological innovations have enabled far more powerful DSS(More)
The idea of organizing a special issue about the next decade of DSS was borrowed from Keen's paper (1987) in which certain predictions were made. Now, almost 15 years later, we are witnessing an unparalleled digital revolution brought by the Internet, intra-nets, superb multimedia and powerful and relatively inexpensive computing and storage facilities.(More)
In this paper we shall consider additions of interactive fuzzy numbers, where the interactivity relation between fuzzy numbers is defined by their joint possibility distribution. We will prove that Nguyen's theorem remains valid in this environment and present the explicit formulas for the γ-level sets of the extended sum of two completely correlated fuzzy(More)
OBJECTIVE The authors sought to determine whether a series of needle acupuncture treatments produced long-term relief of chronic low back pain. DESIGN A blinded placebo-controlled study with an independent observer. The patients were randomized to receive manual acupuncture, electroacupuncture, or active placebo (mock transcutaneous electrical nerve(More)
To have a real option means to have the possibility for a certain period to either choose for or against making an invetsment decision, without binding oneself up front. The real option rule is that one should invest today only if the net present value is high enough to compensate for giving up the value of the option to wait. Because the option to invest(More)