Latent topic models have been successfully applied as an unsupervised topic discovery technique in large document collections. With the proliferation of hypertext document collection such as the Internet, there has also been great interest in extending these approaches to hypertext [6, 9]. These approaches typically model links in an analogous fashion to how they model words the document-link c...

Texture is an important property used in classifying the regions of interests in an image. Literally, it is defined as the uniformity of a substance or a surface. Technically, it gives us the information about the spatial arrangement of structures in an image. One of the earliest methods used for texture feature extraction is the Gray-Level Co-occurrence Matrix (GLCM) which contains second orde...

Two series of bimetallic Ni-Co catalysts and corresponding monometallic catalysts with ca. 20 wt% metal loading were evaluated in hydrodeoxygenation (HDO) of phenol as a model compound for bio-oil. The bimetallic catalysts outperformed the corresponding monometallic catalyst in terms of conversion and cyclohexane selectivity. This could be attributed to the formation of Ni-Co alloy, which cause...

To obtain high quality of results in gamma spectrometry, it is necessary to calibrate energy and efficiency of gamma detector as accurate as possible. To achieve this aim, utilizing the convenient gamma source can be very useful. Therefore, purpose of present study was to evaluate the determined efficiency by single point gamma sources and multi-nuclides gamma source in a high purity germanium ...

We evaluate the relic density of neutralinos in the minimal supergravity (mSUGRA) model. All 2 → 2 neutralino annihilation diagrams, as well as all initial states involving sleptons, charginos, neutralinos, and third generation squarks are included. Relativistic thermal averaging of the velocity times cross sections is performed. We find that co-annihilation effects are only important on the ed...

Urban built-up area information is required by various applications. However, urban built-up area extraction using moderate resolution satellite data, such as Landsat series data, is still a challenging task due to significant intra-urban heterogeneity and spectral confusion with other land cover types. In this paper, a new method that combines spectral information and multivariate texture is p...

This work aims to analyze the use of spatial information and the effectiveness of such information for tracking a person’s head in a video sequence. This thesis introduces new concepts that make use of color information along with a limited amount of spatial information on a global scale. Also, existing concepts like co-occurrence matrices are adapted to color images to provide a concept that u...

Experiments on the hydrogenation of CO on crystalline and amorphous ice at 15 K were carried out to investigate the structural effects of the ice surface. The effective rate of H atom addition to CO on the amorphous ice was found to be larger than that on the crystalline ice, while CO depletion on crystalline ice became larger after long exposure. We demonstrated that the CO-coverage on the ice...

The aim of the steganography methods is to communicate securely in a completely undetectable manner. LSB Matching and LSB Matching Revisited steganography methods are two general and esiest methods to achieve this aim. Being secured against first order steganalysis methods is the most important feature of these methods. On the other hand, these methods don't consider inter pixel dependency. The...

We show that the CO/CO intensity ratio in nearby galaxies varies systematically as a function of the star formation rate surface density (ΣSFR) and gas surface density. The same effect is observed in different transitions, and in the CO/CO ratio, while the CO/CO ratio appears to remain constant as a function of ΣSFR. We discuss the cause of these variations, considering both changes in the phys...