On the Impact of Geometry on Ad Hoc Communication in Wireless Networks

In this work we address the question how important is the knowledge of geometric location and network density to the efficiency of (distributed) wireless communication in ad hoc networks. We study fundamental communication task of broadcast and develop well-scalable, randomized algorithms that do not rely on GPS information, and which efficiency formulas do not depend on how dense the geometric network is. We consider two settings: with and without spontaneous wake-up of nodes. In the former setting, in which all nodes start the protocol at the same time, our algorithm accomplishes broadcast in $O(D\log n + \log^2 n)$ rounds under the SINR model, with high probability (whp), where $D$ is the diameter of the communication graph and $n$ is the number of stations. In the latter setting, in which only the source node containing the original message is active in the beginning, we develop a slightly slower algorithm working in $O(D\log^2 n)$ rounds whp. Both algorithms are based on a novel distributed coloring method, which is of independent interest and potential applicability to other communication tasks under the SINR wireless model

The use of time consecrated to the realization of individual activities as a parameter to allocate resources cost to activities in Activity Based Costing

In the paper the possibilities of using the time spent on realization of individual activities as a parameter for allocating the costs of resources to activities in Activity Based Costing are presented. The authors describe the construction of a resources cost driver based on this time. They suggest using it to allocate the cost of those resources which are difficult to allocate to activities, especially in the situation when it is too complex or too expensive to use other cost drivers. An example of the proposed cost driver application during the implementation of Activity Based Costing in a trade company is presented. In the paper special attention is paid to the dependence between the cost of information construction, maintenance and acquisition in an Activity Based Costing model and the precision of the cost allocation results.costs, activity based costing cost driver

Implementation of Activity Based Costing method in commercial company – case study

The study refers to the issue of Activity Based Costing implementation. The article presents experiences gained during an implementation that was performed between 2002–2003 in the Polish division of an international holding in the electro-technical branch. The authors present in a detailed manner the problems they came across during the execution of the project and the adopted methods of solving them. The procedure is described from the moment of making decision to implement ABC, through the identification of resources, the processes and activities identification, to the evaluation of the cost of the individual activities and defined cost objects. In particular, the problem of gathering information is treated (methods of carrying out interviews and problems linked to the interviews, interpretation of accounting data, which do not always identify in a clear way essential cost types, the problem of finding precise cost drivers, which at the same time can be applied in practice).activity based costing, product costing

Influence of high temperature on stiffness of R/C beams, Experimental stiffness comparison of tensioned or compressed zone of the cross-section

The paper presents results of experimental research whose main topic was determination of stiffness reduction in bent reinforced concrete beams in two cases: when only tensioned or only compressed zone was exposed to high temperature. Twenty four reinforced concrete beams with rectangular cross-section were prepared for the experiment. Eight groups of beams were prepared in total: 2 reinforcement ratio - 0.44 and 1.13% x 2 levels of load - 50 or 70% of destructive force ensuring the constant value of bending moment in the centre part of heated beams x 2 diagrams. Three beams were used in each group. Significant cross-section stiffness reduction was observed in beams where the tensile zone was heated. This was due to considerable elongation of the bars where the steel load elongation summed up with the free thermal strain. In beams where the compressed zone was heated the stiffness reduction was observed only after the time where the tensile zone heated cross-sections were already destroyed

Individual Professional Practice in the Company

V této bakalářské práci popisuji průběh při absolvování individuální odborné praxe ve firmě Tieto Czech s.r.o., ve které jsem pracoval na pozici Junior Java Developer. Na úvod shrnu zadání projektu a použité technologie. V hlavní části práce popisuji postup při „fullstack“ vývoji aplikace pro správu poznámek, který sloužil primárně pro naučení se technologií, ve kterých firma pracuje. V závěru zmíním na čem právě ve firmě pracuju a shrnu získané zkušenosti v průběhu praxe.In this Bachelor thesis, I describe the course of individual professional practise in the company Tieto Czech s.r.o., in which I worked in the position of Junior Java Developer. I will summarize the project assignment and the technology I used. In the main part of the thesis, I describe process of “fullstack” development of notes management application, which has served primarily for learning the technology in which the company is working. In the end, I mention what I am working on right now and summarize the experience gained during the practice.460 - Katedra informatikyvýborn

Implementation of a Synchronized Oscillator Circuit for Fast Sensing and Labeling of Image Objects

We present an application-specific integrated circuit (ASIC) CMOS chip that implements a synchronized oscillator cellular neural network with a matrix size of 32 × 32 for object sensing and labeling in binary images. Networks of synchronized oscillators are a recently developed tool for image segmentation and analysis. Its parallel network operation is based on a “temporary correlation” theory that attempts to describe scene recognition as if performed by the human brain. The synchronized oscillations of neuron groups attract a person’s attention if he or she is focused on a coherent stimulus (image object). For more than one perceived stimulus, these synchronized patterns switch in time between different neuron groups, thus forming temporal maps that code several features of the analyzed scene. In this paper, a new oscillator circuit based on a mathematical model is proposed, and the network architecture and chip functional blocks are presented and discussed. The proposed chip is implemented in AMIS 0.35 μm C035M-D 5M/1P technology. An application of the proposed network chip for the segmentation of insulin-producing pancreatic islets in magnetic resonance liver images is presented

Multidrug resistant coagulase-negative Staphylococcus spp. isolated from cases of chronic rhinosinusitis in humans. Study from Poland

For many years, coagulase-negative staphylococci (CoNS) have been considered non-pathogenic bacteria. However, recently, CoNS are becoming more common bacteriological factors isolated from cases of chronic rhinosinusitis in humans. Moreover, most of them represent the multidrug-resistant or/and methicillin-resistant profile, which significantly increases the therapeutic difficulties. The aim of the study was to characterize profile of resistant coagulase-negative staphylococci isolated from cases of chronic rhinosinusitis in patients treated in a Medical Center in Warsaw in 2015-2016. The study material was derived from patients with diagnosed chronic rhinosinusitis treated at the MML Medical Center in Warsaw. The material was obtained intraoperatively from maxillary, frontal, and ethmoid sinuses. In total, 1,044 strains were isolated from the studied material. Coagulase-negative staphylococci were predominant, with the largest share of Staphylococcus epidermidis. Isolated CONS were mainly resistant to macrolide, lincosamide, and tetracycline. Among the S. epidermidis strains, we also showed 35.6% of MDR and 34.7% of methicillin-resistant strains. The same values for other non-epidermidis species were 31.5% and 18.5%, respectively and the percentage of strains with MAR >0.2 was greater in S. epidermidis (32.6%) than S. non-epidermidis (23.9%). Although the percentage of strains resistant to tigecycline, glycopeptides, rifampicin and oxazolidinones was very small (2.3%, 1.9%, 1.4% and 0.7% respectively), single strains were reported in both groups. The study has shown a high proportion of MDR and methicillin-resistant CoNS strains, which indicates a large share of drug-resistant microorganisms in the process of persistence of chronic rhinosinusitis; therefore, isolation of this group of microorganisms from clinical cases using aseptic techniques should not be neglected

Genetic polymorphisms in DNA base excision repair gene XRCC1 and the risk of squamous cell carcinoma of the head and neck

<p>Abstract</p> <p>Background</p> <p>The genes of base excision repair (BER) pathway have been extensively studied in the association with various human cancers. We performed a case-control study to test the association between two common single nucleotide polymorphisms (SNPs) of <it>XRCC1 </it>gene with human head and neck squamous cell carcinoma (HNSCC).</p> <p>Methods</p> <p>The genotype analysis of Arg194Trp and Arg399Gln gene polymorphisms for 92 HNSCC patients and 124 controls of cancer free subjects, in Polish population were performed using the PCR-based restriction fragment length polymorphism (PCR-RFLP) with endonuclease <it>Msp</it>I.</p> <p>Results</p> <p>No altered risk has been found individually for these SNPs, however haplotypes analysis showed high association with head and neck cancer. The highest frequency, according to wild-type of Arg194Arg and Arg399Arg genotypes, was identified for Arg194Trp-Arg399Arg haplotype (OR, 2.96; 95% CI, 1.01–8.80).</p> <p>Conclusion</p> <p>Finally, we identified the combined Arg194Trp-Arg399Arg genotype of base excision repair gene <it>XRCC1 </it>that was associated with HNSCC and may have an impact on identification of a high-risk cancer population.</p