The main purpose of this article is to offer some characterizations of $delta$-double derivations on rings and algebras. To reach this goal, we prove the following theorem:Let $n > 1$ be an integer and let $mathcal{R}$ be an $n!$-torsion free ring with the identity element $1$. Suppose that there exist two additive mappings $d,delta:Rto R$ such that $$d(x^n) =Sigma^n_{j=1} x^{n-j}d(x)x^{j-1}+Si...

Let ρ(s) be a fixed infinitely differentiable function defined on R+ = [0,∞) having the properties: (i) ρ(s) ≥ 0, (ii) ρ(s) = 0 for s ≥ 1, and (iii) Rm δn(x)dx = 1 where δn(x) = cmnmρ(n2r2) and cm is the constant satisfying (iii). We overcome difficulties arising from computing ∇lδn and express this regular sequence by two mutual recursions and use a Java swing program to evaluate corresponding...

We investigate further improvement of boosting in the case that the target concept belongs to the class of r-of-k threshold Boolean functions, which answer “+1” if at least r of k relevant variables are positive, and answer “−1” otherwise. Given m examples of a r-of-k function and literals as base hypotheses, popular boosting algorithms (e.g., AdaBoost) construct a consistent final hypothesis b...

Résumé—Fraigniaud et al. [1] et indépendamment Thorup et al. [2] ont montré que tout arbre à n nœuds possède un schéma de routage de plus courts chemins utilisant des adresses, des entêtes et des tables de routage de O(log n) bits. Il est toujours ouvert de savoir si ce résultat optimal peut être étendu ne seraitce qu’aux réseaux de largeur arborescente deux dont la meilleure borne connue, due ...

Multiple social and financial factors dictate that therapies of all kinds be oriented toward producing measurable changes in clients. Crisis intervention is one therapy approach that often produces measurable changes in clients. However, this approach may not be useful for individuals unable to identify a precipitating event, or who want change beyond returning to a previous level of functionin...

An (r, k)-parking function of length n may be defined as a sequence (a1, . . . , an) of positive integers whose increasing rearrangement b1 ≤ · · · ≤ bn satisfies bi ≤ k+ (i− 1)r. The case r = k = 1 corresponds to ordinary parking functions. We develop numerous properties of (r, k)-parking functions. In particular, if F (r,k) n denotes the Frobenius characteristic of the action of the symmetric...

Çal??mada yurt d???na kendi istek ve iradeleriyle en az bir y?ll???na gidip Türkiye’ye dönen herhangi üniversitede çal??malar?n? sürdüren Türk akademisyenlerin beyin göçüne bak??? ya?am memnuniyeti perspektifinden incelenmi?tir. Bu ba?lamda anket tekni?i kullan?lm?? elde edilen veriler frekans da??l?m regresyon analizi yöntemiyle s?nanm??t?r. Çal??madan sonuçlara göre, memnuniyetinin akademisye...