Knowing whether a proposition is true means knowing that it is true or knowing that it is false. In this paper, we study logics with a modal operator Kw for knowing whether but without a modal operator K for knowing that. This logic is not a normal modal logic, because we do not have Kw(φ → ψ) → (Kwφ → Kwψ). Knowing whether logic cannot define many common frame properties, and its expressive po...

The paper discusses the concept of energy, its transformation, and transmission. Any physical object, event, word, sound, thought or even money is seen as a bundle of energy. This is a fictional story suggesting direction of technological/scientific development in the future.

This double issue of Cybernetics and Human Knowing is dedicated to celebrating the life and work of Heinz von Foerster, cybernetician extraordinaire. He died on October 2nd, 2002. Mai von Foerster, his wife of over 60 years, died on June 22nd, 2003. They lived as a team and it is wrong to think of the work that appeared under the authorship of Heinz von Foerster without thinking of Mai's part i...

Due to the prominent role of recommender systems in our daily lives, it is increasingly important inform users why certain items are recommended and personalize these explanations user. In this study, we explored how a music system should be designed fit preference different personal characteristics. More specifically, investigated three characteristics that influence perception interfaces: nee...