I introduce an axiomatic representation, called ecoset, to consider interactions between species in ecological systems. For interspecific competition, the exclusion conjecture (Gause) is put in a symbolic way and used as a basic operational tool to consider more complex cases like two species with two superposed resources (niche differentiation) and apparent competitors. Competition between tor...

We introduce a symbolic representation like set theory to consider ecologic interactions between species (ECOSET). The ecologic exclusion principle (Gause) is put in a symbolic way and used as operational tool to consider more complex cases like interaction with sterile species (SIT technique), two species with two superposed sources (niche differentiation) and N+P species competing by N resour...

despite the development of appropriate academic and experiential background knowledge management and its manifestation as a competitive advantage, many organizations have failed in its effective utilization. among the reasons for this failure are some deficiencies in terms of methodology in inappropriate recognition and translation of km dimensions and lack of systematic approach in establishme...

We consider a trade model combining 2x2x2 Heckscher-Ohlin structure, monopolistic competition, transport costs, and multinational corporations. demonstrate how the mix of national firms that operate in equilibrium depends on technology division world endowment between countries. Multinationals are more likely to exist similar countries both relative absolute endowments. Where multinationals the...

the increase in water demand and its services due to population growth and the raising of the standards of living, health, and hygiene along with the limitation of water resources, droughts, and climate change has attracted water specialists and planners to explore the use of unconventional water resources, such as sewage and saline waters. moreover, industrial and rural wastewater disposal and...

Abstract T his paper explains bilateral trade patterns between South Korea and thirteen OPEC member countries over the period 1980-2014 using a gravity model. The estimation results show that the gravity equation fits the data reasonably well. We confirmed the existence of long term relationships between the bilateral trade flows and the main components of gravity model - ...