A problem arising in the control of flutter in compression systems via mistuning is formulated as maximizing a quadratic function with a circulant matrix over a set of vectors whose every component can take one of three values (the three level problem) or one of two values (the two level problem).

The paper aims at investigating current status of relational capital (RC) management as a part of intellectual capital management among enterprises of emerging economies given the increasing importance of this intangible asset and very limited research in this context. With a sample of 189 enterprises through various sectors in Vietnam, statistical method was employed to shed light on how they have been managing their intellectual capital (IC) and, more importantly, five different RC factors, including customer relationships, supplier relationships, public relationships, investor relationships and partner relationships. The findings witnessed that relational capital is the strength of firms, with customer relationship and supplier relationship being top performing factors. Based on the results, several recommendations are proposed to improve the RC management capability in transitional countries. RC management should be linked to strategic management, in which RC strategy must emanate from and towards achieving the strategic goals of firms. However, RC strategy and its development plan need to be built based on a comprehensive analysis of business strategy, competitive strategy, and intellectual capital analysis. There is also a need to raise awareness and understanding among managers about RC. Enterprises need to apply many measures to improve RC management capacity of managers.

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Previous findings by Köprülü (2014) indicated that at least 75% of communication taking place in the classroom was non-verbal behavior; besides, nonverbal messages were supposed to reflect what an individual was actually thinking and feeling more accurately. Based on this specific function, the present study explores the relation between students' nonverbal classroom behaviour and academic interest and achievement. Two hundred eighty-eight students from Vietnam National University and other universities participated in this study. Questionnaire survey and observation were the primary methods used. The results showed a low positive correlation between students’ frequency of nonverbal behavior in the classroom and their learning interests. However, students’ learning interest explained 18% of the variation of their gestures relating to a sitting posture, in which two variables named positive emotion and assignment completion contributed significantly to the regression model. This finding suggested that the lecturers could rely on students’ behaviors, such as sitting with their back straight, looking at the lecturer, and nodding, to determine students’ academic interests during class.