Editorial for Vol.28, No.4

In the fourth, and final, issue of CIT. Journal of Computing and Information Technology (Vol. 28, No. 4; December 2020), we bring four papers from the regular section, which address subjects in graph theory, computer vision, time series, and machine learning.

Editorial for Vol.28, No.3

This third issue (September 2020) of CIT. Journal of Computing and Information Technology comprises four papers from the regular section, tackling topics from the areas of software testing and debugging, machine learning, natural language processing and business management processing.

Editorial For Vol.28, No.2

The second issue of CIT's Vol. 28 (Vol. 28, No. 2, June 2020) brings five papers from the regular section, which focus on topics from the areas of computer networks and network security, software, and robotics.

Semiorthogonal Decompositions on Total Spaces of Tautological Bundles

Let $U$ be the tautological subbundle on the Grassmannian $\operatorname{Gr}(k, n)$. There is a natural morphism $\textrm{Tot}(U) \to{\mathbb{A}}^n$. Using it, we give a semiorthogonal decomposition for the bounded derived category $D^b_{\!\textrm{coh}}(\textrm{Tot}(U))$ into several exceptional objects and several copies of $D^b_{\!\textrm{coh}}({\mathbb{A}}^n)$. We also prove a global version of this result: given a vector bundle $E$ with a regular section $s$, consider a subvariety of the relative Grassmannian $\operatorname{Gr}(k, E)$ of those subspaces that contain the value of $s$. The derived category of this subvariety admits a similar decomposition into copies of the base and the zero locus of $s$. This may be viewed as a generalization of the blow-up formula of Orlov, which is the case $k = 1$.

STRESS AND DEFORMATION STUDY ON CASTELLATED STEEL BEAM WITH TAPERED SHAPE AND HEXAGONAL OPENINGS

Castellated steel beam is a beam with a regular section cut into half with a particular pattern and regrouped with welding to increase its height compared to the original. This structure element has been developed in building constructions since many years ago. However, its uniform section along the span will make the modification no longer effective in cantilever structure, unless it has additional adaptation. Therefore, in this study, it is proposed to use a castellated steel beam with a tapered shape to be applied as cantilever structures. A steel beam with IWF section 150x75x5x7 is the primary sample type in this research. Some variations were made such as openings angle for 450 and 500, openings space for 50 mm, 70 mm, and 90 mm, openings diameter for 50 mm, 75 mm, and 100 mm, and span length for 2 m, 2.5 m, 3 m, and 3.5 m. Two open-source software namely FreeCAD and LisaFEA were used to draw solid 3-dimensional samples and to conduct the numerical analysis to determine stress and deformation respectively. From the result, it is known that the smallest stresses and deformations can be achieved by a different angle of openings, openings space, and diameter for each span length.

Slope and formality characteristics and its effect on the density of natural vegetation in the Pradust mountain range using GIS and RS: الخصائص الانحدارية الشكلية وأثرها على كثافة الغطاء النباتي الطبيعي الزراعي في سلسلة جبال برادوست باستخدام GIS وRS

The research aims to study the characteristics of the formal regressions on the natural vegetation in agricultural intensity Pradost Mountains, located in the province of Arbil in northern Iraq as part of Iraq's Kurdistan region series, with a series area (288.36 km2). Through research have been identified as the physical characteristics (geological, climatic, topographic, natural plant, cultivated land) as well as to identify the spatial distribution of each of these characteristics. Through research have been identified regression formal qualities that form of rectal type of first Alvesm forms slopes and regular Section II of the forms slopes reached area (122.99 km2) Any percentage (42.65%) of the total area of the chain and the form of the convex of the first section forms slopes reached area (89.44 km 2) any percentage (31.02%) of the total area of the chain.A search has been classified vegetation, depending on the value of plant coverage coefficient (NDVI) to three type as preoccupied density of the medium type more than half of the chain space with an area of (206.86 km2) Any percentage (71.74%) of the total overall space for the series, showed results the density of the extreme type increasing proportion within the regular regression from what is in irregular gradient, which demonstrates that the regular gradient advantage of being equal to the currencies of weathering and erosion reverse irregular gradient which has not seen stability yet because of the different angles of slope, making it difficult invested before the occupants in the field of agriculture and the use of agricultural machinery.