let $g$ be a non-abelian group. the non-commuting graph $gamma_g$ of $g$ is defined as the graph whose vertex set is the non-central elements of $g$ and two vertices are joined if and only if they do not commute.in this paper we study some properties of $gamma_g$ and introduce $n$-regular $ac$-groups. also we then obtain a formula for szeged index of $gamma_g$ in terms of $n$, $|z(g)|$ and $|g|...

‎let $d_{n,m}=big[frac{2n+1-sqrt{17+8(m-n)}}{2}big]$ and‎ ‎$e_{n,m}$ be the graph obtained from a path‎ ‎$p_{d_{n,m}+1}=v_0v_1 cdots v_{d_{n,m}}$ by joining each vertex of‎ ‎$k_{n-d_{n,m}-1}$ to $v_{d_{n,m}}$ and $v_{d_{n,m}-1}$‎, ‎and by‎ ‎joining $m-n+1-{n-d_{n,m}choose 2}$ vertices of $k_{n-d_{n,m}-1}$‎ ‎to $v_{d_{n,m}-2}$‎. ‎zhang‎, ‎liu and zhou [on the maximal eccentric‎ ‎connectivity ind...

Patients assess the efficiency of nursing care by fulfillment their desires. This thesis was to identify correlation between nurses' inpatient service quality and patient satisfaction. quantitative cross-sectional research sample made up all patients admitted Deli Serdang Hospital, which indicates that about 320 were hospitalized for [for an average of] 3 days.5 days. as many 77 human populatio...

In Mobile Ad Hoc Networks (MANETs), wireless mobile devices are designed to work in co-operative manner. These devices are connected via wireless link to communicate with each other. The node mobility, channel collision and abnormal channel conditions are the reasons for the occurrence of data transmission failure in MANET. Even though several routing schemes are available to handle these probl...

The difficulties in predicting disulfide connectivity from protein sequences lie in the nonlocal properties of the disulfide bridges that involve cysteine pairs at large sequence separation. Though some progress has been recently made in the prediction of disulfide connectivity, the current methods predict less than half of the disulfide patterns for the data set sharing less than 30% sequence ...

Large datasets with interactions between objects are common to numerous scientific fields (i.e. social science, internet, biology. . . ). The interactions naturally define a graph and a common way to explore or summarize such dataset is graph clustering. Most techniques for clustering graph vertices just use the topology of connections ignoring informations in the vertices features. In this pap...

In a standard f -connectivity network design problem, we are given an undirected graph G = (V,E), a cut-requirement function f : 2 → N, and non-negative costs c(e) for all e ∈ E. We are then asked to find a minimum-cost vector x ∈ N such that x(δ(S)) ≥ f(S) for all S ⊆ V . We focus on the class of such problems where f is a proper function. This encodes many well-studied NP-hard problems such a...

A disulfide bond, formed by two oxidized cysteines, plays an important role in the protein folding and structure stability, and it may regulate protein functions. The disulfide connectivity prediction problem is to reveal the correct information of disulfide connectivity in the target protein. It is difficult because the number of possible patterns grows rapidly with respect to the number of cy...

In recent years wireless Internet access and wireless communications between peers have become the focus of intensive research efforts in various areas of information and communication technologies. Mobility aspects, software development and support for mobile users are currently of major interest within this research area. The Mobile IP protocol is deployed for mobility management of hosts mov...