prediction of weed emergence timing would help minimize crop yield loss and reducing herbicide use by optimization of the timing of weed control. therefore, seedling emergence evaluation was conducted in different irrigation levels (40, 60, 80, 100 percent of crop water requirement and furrow irrigation) to develop a thermal time seedling emergence model for amaranthus retroflexus l. in sunflow...

We develop an approach for solving one-sided optimal stopping problems in discrete time for general underlying Markov processes on the real line. The main idea is to transform the problem into an auxiliary problem for the ladder height variables. In case that the original problem has a one-sided solution and the auxiliary problem has a monotone structure, the corresponding myopic stopping time ...

This paper analyzes issues which appear when supporting pruning operations in tabled LP. A version of the once/1 control predicate tailored for tabled predicates is presented, and an implementation is discussed and evaluated. The use of once/1 with answer-on-demand strategies makes it possible to avoid computing unneeded solutions for problems which can benefit from tabled LP but in which only ...

is satisfied, where σ is the noise level. Alternatively, the algorithm terminates when the maximum number of 400 ·n function evaluations is exceeded. For each problem, a series of 50 independent runs are conducted. We considered a test run successful if the stopping criterium (1) is satisfied before exceeding the maximal number of function evaluations. To compare the performance of methods from...

Black students account for over 72% of enrolments in higher education, but only a small percentage of them choose Early Childhood Education (ECE) as a field of study and complete the qualification. The purpose of this study was to examine, from the perspective of black ECE students, why so few of them enrol in this particular programme at a historically white university. Through a qualitative, ...