Grouping related attributes

Grouping objects that are described by attributes, or clustering is a central notion in data mining. On the other hand, similarity or relationships between attributes themselves is equally important but relatively unexplored. Such groups of attributes are also known as directories, concept hierarchies or topics depending on the underlying data domain. The similarities between the two problems of grouping objects and attributes might suggest that traditional clustering techniques are applicable. This thesis argues that traditional clustering techniques fail to adequately capture the solution we seek. It also explores domain-independent techniques for grouping attributes. The notion of similarity between attributes and therefore clustering in categorical datasets has not received adequate attention. This issue has seen renewed interest in the knowledge discovery community, spurred on by the requirements of personalization of information and online search technology. The problem is broken down into (a) quantification of this notion of similarity and (b) the subsequent formation of groups, retaining attributes similar enough in the same group based on metrics that we will attempt to derive. Both aspects of the problem are carefully studied. The thesis also analyzes existing domainindependent approaches to building distance measures, proposing and analyzing iii several such measures for quantifying similarity, thereby providing a foundation for future work in grouping relevant attributes. The theoretical results are supported by experiments carried out on a variety of datasets from the text-mining, web-mining, social networks and transaction analysis domains. The results indicate that traditional clustering solutions are inadequate within this problem framework. They also suggest a direction for the development of distance measures for the quantification of the concept of similarity between categorical attributes

Design of a low-velocity impact framework for evaluating space-grade materials

Material deformation and failure under impact loading is a subject of active investigation in space science and often requires very specialized equipment for testing. In this work, we present the design, operational analysis and application of a low-velocity ($\sim 100$ m/s) projectile impact framework for evaluating the deformation and failure of space-grade materials. The system is designed to be modular and easily adaptable to various test geometries, while enabling accurate quantitative evaluation of plastic flow. Using coupled numerical methods and experimental techniques, we first establish an operating procedure for the system. Following this, its performance in two complementary impact configurations is demonstrated using numerical and experimental analysis. In the first, a Taylor impact test is performed for predicting the deformed shape of a cylindrical projectile impinging on a rigid substrate. In the second, deformation of a plate struck by a rigid projectile is evaluated. In both cases, physics-based models are used to interpret the resulting fields. We present a discussion of how the system may be used both for material property estimation (e.g., dynamic yield strength) as well as for failure evaluation (e.g., perforation and fracture) in the same projectile impact configuration

Hubungan Antara Empati dengan Perilaku Agresi Siswa RegulerSMKN 2 Malang Kepada Teman Sekelas Yang Berkebutuhan Khusus (ABK)

ABSTRAK Reubun, Sinta Oktavia Ayu Dawara. 2015. Hubungan Antara Empati dengan Perilaku Agresi Siswa RegulerSMKN 2 Malang Kepada Teman Sekelas Yang Berkebutuhan Khusus (ABK). Skripsi, Jurusan Psikologi, Fakultas Pendidikan Psikologi, Universitas Negri Malang; Pembimbing (I) Dr.Tutut Chusniyah, M.Si (II) Drs. H. Mohammad Bisri, M.Si.  Kata Kunci: empati, agresi siswa reguler terhadap ABK.  Tujuan dari penelitian ini adalah (1) untuk mengetahui gambaran empati siswa reguler SMKN 2 Malamg kepada teman sekelas yang berkebutuhan khusus (ABK), (2) untuk mengetahui gambaran agresi siswa reguler SMKN 2 Malamg kepada teman sekelas yang berkebutuhan khusus (ABK) (3) untuk mengetahui hubungan antara  empati dan perilaku agresi siswa reguler SMKN 2 Malamg kepada teman sekelas yang berkebutuhan khusus (ABK).Penelitian ini menggunakan rancangan deskriptif dan korelasional. Subyek peneliti berjumlah 63 siswa kelas X administrasi perhotelan (AP)  yang di peroleh dengan menggunakan tehnik cluster sampling berdasarkan kriteriayang telah ditentukan, yaitu kelas reguler yang didalamnya pernah terjadi perilaku agresi dari siswa reguler kepada teman sekelas berkebutuhan khusus (ABK). Pengambilan data penelitian menggunakan skala empati dan skala agresi. Data dianalisis secara deskriptif menggunakan skor Z, dan dianalisis korelasi menggunakan teknik analisis pearson correlation.Hasil penelitian ini menunjukkan bahwa sebagian besar  siswa kelas X administrasi perhotelan (AP) (1) memiliki tingkat empati yang tinggi (2) memiliki tingkat agresifitas yang tinggi (3) ada hubungan yang negatif antara empati dengan agresi dengan nilai r  = -0,262dan p = 0,03

Synthesis, Characterization, and Antimicrobial and Antispermatogenic Activity of Bismuth(III) and Arsenic(III) Derivatives of Biologically Potent Nitrogen and Sulfur Donor Ligands

A series of Bi(III) and As(III) complexes with two N∩S donor ligands, 1-(4-chloro-2-oxo-2H-chromen-3-yl)-methylene)-thiosemicarbazide (L1H) and N′-[1-(2-oxo-2H-chrome-3yl-ethylidene]-hydrazinecarbodithionic acid benzyl ester (L2H) have been synthesized by the reaction of BiCl3 and Ph3As with ligands in 1 : 1 and 1 : 2 molar ratios. All the synthesized compounds were characterized by elemental analyses, melting point determinations, and a combination of electronic, IR, 1H NMR, 13C NMR spectroscopic techniques, and X-ray diffraction for structure elucidation. In order to evaluate the effect of metal ions upon chelation, both the ligands and their complexes have been screened for their antimicrobial activity against the various pathogenic bacterial and fungal strains. The metal complexes have shown to be more antimicrobial against the microbial species as compared to free ligands. Both the ligands and their corresponding metal complexes have been tested for their antifertility activity in male albino rats. The marked reduction in sperm motility and density resulted in infertility. Significant alterations were found in biochemical parameters of reproductive organs in treated animals as compared to control group. It is concluded that all these effects may finally impair the fertility of male rats

The use of grinded andesite-sand and foaming-agent to improve the porosity of foam-concrete

There has been an increase in the demand for the use of green concrete in construction. Foam concrete is a lightweight concrete type that has the characteristics of being lightweight, low-strength, highly porous with a high absorption rate and with good insulation properties. The use of sand smoothed andesite in the manufacture of foam concrete is expected to improve the properties of porous concrete and make it more suitable for use. In this study, 120 mortar cubes with the size of 5 cm was used for the density testing, compressive strength testing and porosity testing of foam concrete. Foam concrete is made by mixing cement, sand andesite of 1:2.75 and w/c 0.7 and a foaming agent, which are respectively 1%,2%, 3%, and 4%. Porosity measurements with the soaking method and the concrete compressive strength test were performed, respectively at the age of 7, 14, 21, and 28 days. The results showed that the increase in use of a foaming agent will cause a reduction in the density and the compressive strength of the concrete. While the porosity of foam concrete which is measured at the "volume of permeable void" will increase with the decreasing density and compressive strength of concrete

Porosity governs failure in bioconsolidated space bricks

Understanding the mechanical response and failure of consolidated extra-terrestrial soils requires analyses of the interactions between propagating cracks the material's inherent pore structure. In this work, we investigate the fracture behaviour of lunar soil simulant consolidated using microbially induced calcite precipitation (MICP). We develop a numerical framework, based on a lattice network with local beam elements, to simulate the nucleation, propagation, branching and merging of multiple cracks within the sample. Our simulations capture the effects of local pores on crack paths as well as provides a means to predict the behaviour of samples with varying global porosity and/or uncertainties in local material stiffness. We identify multiple statistical lattice parameters that encode signatures of single or multiple crack growth events. Our results reveal the complexities involved in the fracture process with porous brittle solids and may easily be adapted to understand failure mechanisms and micro/macro crack evolution in other consolidated structures.Comment: 24 pages, 7 figures, 1 tabl

The use of grinded andesite-sand and foaming-agent to improve the porosity of foam-concrete

There has been an increase in the demand for the use of green concrete in construction. Foam concrete is a lightweight concrete type that has the characteristics of being lightweight, low-strength, highly porous with a high absorption rate and with good insulation properties. The use of sand smoothed andesite in the manufacture of foam concrete is expected to improve the properties of porous concrete and make it more suitable for use. In this study, 120 mortar cubes with the size of 5 cm was used for the density testing, compressive strength testing and porosity testing of foam concrete. Foam concrete is made by mixing cement, sand andesite of 1:2.75 and w/c 0.7 and a foaming agent, which are respectively 1%,2%, 3%, and 4%. Porosity measurements with the soaking method and the concrete compressive strength test were performed, respectively at the age of 7, 14, 21, and 28 days. The results showed that the increase in use of a foaming agent will cause a reduction in the density and the compressive strength of the concrete. While the porosity of foam concrete which is measured at the "volume of permeable void" will increase with the decreasing density and compressive strength of concrete