this study was initiated to characterize urban and peri-urban sheep production systems and their economic importance in and around the towns of debre berhan and dessie, ethiopia. the study was undertaken using group discussions, structured questionnaire and personal observations. in both locations the majority of sheep producers were male household heads and predominantly traders in urban and f...

Most educational or training games, also referred to as serious games, have been developed without an underlying design theory. In order to make a contribution to the development of such a theory, we present the underlying design philosophy of Levee Patroller, a 3D first-person game used to train levee patrollers in the Netherlands. This approach stipulates that the design of a serious game is ...

In many real-world applications concerning multi-objective optimization, the true objective functions are not observable. Instead, only noisy observations are available. In recent years, the interest in the effect of such noise in evolutionary multi-objective optimization (EMO) has increased and many specialized algorithms have been proposed. However, evolutionary algorithms are not suitable if...

Three rejection tests for multi-objective optimization problems based on first order optimality conditions are proposed. These tests can certify that a box does not contain any local minimizer, and thus it can be excluded from the search process. They generalize previously proposed rejection tests in several regards: Their scope include inequality and equality constrained smooth or nonsmooth mu...

The Hamburg/ESO survey (HES; [4]) is an objective-prism survey for bright quasars based on IIIa-J plates taken with the ESO Schmidt telescope and its 4◦ prism. It covers the total southern extragalactic sky (δ <+2◦. 5; |b| & 30◦). All 380 Schmidt plates (effective area ∼ 7 000 square degrees) have been taken, and have been digitized and reduced in Hamburg. The spectral range of the HES plates i...