THE EFFECT OF COOLING METHOD ON SURFACE ROUGHNESS IN DEEP HOLE DRILLING OF ALUMINIUM ALLOYS

This paper presents the results of an experimental study investigating the effect of usage of different cooling methods in drilling of aluminum alloys with different surface roughness properties of these materials. Two alloys were tested: EN AW2024 and AlSi10Mg with a high silicon content. A comparison was made between surface roughness parameters obtained as a result of the usage of different cooling and lubrication methods such as emulsion cooling, MQL and compressed air cooling. In the experiment, holes with the depth range from 5xD to 15xD were machined using different hole machining strategies

Meta-Programming and Policy-Based Design as a Technique of Architecting Modular and Efficient DSP Algorithm Implementations

Meta-programming paradigm and policy-based design are less known programming techniques in Digital Signal Processing (DSP) community, used to coding in pure C or assembly language. Major software components, like C++ STL, have proven usefulness of such paradigms in providing top performance of highly optimised native code, along with abstraction and modularity necessary in complex software projects. This paper describes composition of DSP code using these techniques, bringing as an example implementation of Feedback Delay Network (FDN) artificial reverberation algorithm. The proposed approach was proven to be practical, especially in case of prototyping computationally intense algorithms. To provide further performance insight, we discuss the techniques in context of other optimisation methods, like Single Instruction Multiple Data (SIMD) instruction sets usage and exploitation of superscalar architecture capabilities

BSBI – a Simple Protocol for Remote Verification of Identity, Journal of Telecommunications and Information Technology, 2012, nr 3

The paper presents the design and the rationale behind a simple verification protocol for autonomous verification modules, and the architecture enabling use of such modules. The architecture assumes strict separation of all personal metadata and the actual verification data. The paper also describes a prototype implementation of the protocol and its extension enabling the state of the module to be monitored from the main system. The proposed design solves the problem of using advanced verification methods, especially biometric ones, in systems where direct implementation is not possible due to hardware incompatibilities, insufficient resources or other limitations

AUTOMATIC PORTAL GENERATION FOR 3D AUDIO - FROM TRIANGLE SOUP TO A PORTAL SYSTEM

The purpose of this paper is to investigate an algorithm for generating an automatic portal system. This has been accomplished based on a given set of triangles. The proposed solution was designed to enhance the performance of a sound beam-tracing engine. This solution can also be used for other areas where portal systems are applicable. The provided technical solution emphasizes the beam tracing engine's requirements. Our approach is based on the work of Haumont et al. (with additional improvements), resulting in improved scene segmentation and lower computational complexity. We examined voxelization techniques and their properties, and have adjusted these to fit the requirements of a beam-tracing engine. As a result of our investigation, a new method for finding portal placement has been developed by adjusting the orientation of the found portals to fit the neighboring scene walls. In addition, we replaced Haumont et al.'s prevoxelization step, which is used for erasing geometrical details (for example, thin walls). This was done by smoothing the distance field that, in effect, eliminated incorrectly positioned portals. The results of our work remove the requirement for walls that separate rooms to have a particular thickness. We also describe a method for building a structure that accelerates real-time queries for determining the area where a given point is located. All of the presented techniques allow for the use of larger sized voxels, which increases performance and reduces memory requirements (not only during the preprocessing phase but also during real-time usage). The proposed solutions were tested using scenarios with scenes of varying complexity

Rola pniowego systemu homeostazy w udarze mózgu

W pracy przedstawiono rolę, jaką w ostrej fazie udaru mózgu spełnia pniowy system homeostazy. Spadek dopływu energii do struktur mózgowia, który jest niewątpliwie istotą udaru, bez względu na jego etiologię i punkt wyjścia (przyczyna pierwotna mózgowa lub przyczyny pozamózgowe), prowadzi do załamania się równowagi pniowej, objawiając się niedomogą pniową (ITC). Jej główną cechą są zaburzenia przytomności. Zrozumienie mechanizmów prowadzących do załamania się homeostazy pnia mózgu powinno spowodować podejmowanie lepszych decyzji diagnostyczno-terapeutycznych w przebiegu udaru

Health and its conditionality as a factor for increasing the level of safety in society

We are constantly aging, and the majority of diseases result from an improper diet and lack of physical movement. Health and a fit body figure is a shared dream among everyone, no matter the continent or country one is living in. For the technological advance, change in the natural and social environment, humanity has to pay a great price. More often things lead to a disordered nervous system, weakened immune system and an impairment in the functionality of the morph functional structure. Diseases of the XXI century are the most common consequences of this state; including diseases of the circulatory system, diabetes (select types), tumors, osteoporosis, obesity, asthma and other diseases of the respiratory system, back pain, neurosis, psychosomatic disorders, brain trauma, allergies and many more diseases. The purpose of the research was to determine pro-healthy behaviors of students studying in fields related to safety, selected two universities from Košice (Slovakia) and from Kraków (Poland) as a factor of increasing the level of security of the society. The research group consisted of 66 students of the Academy of Public and Individual Security in Krakow APEIRON and 70 students from the University of Security Management in Košice. An own structure survey questionnaire was used, containing 9 questions about nutrition and hydration of the body, as well as physical activity and sleep. Based on the analysis of the obtained results, the following conclusions were made: the frequency and duration of physical activity undertaken among the researched students from both universities is at a similar and high level, physical activity is a priority for respondents in maintaining health and safety, both individual and in the population, nutrition, hydration and sleep in the daily life of respondents play a dominant role in health

Changes in the morphological, rheological, and biochemical blood indicators in triathletes

The aim of this study was to assess how the influence of intense physical effort changes the morphological, rheological, and biochemical blood indicators in triathletes. The study group comprised 10 triathletes aged 30-45 years, members of the Active Side of Life Association (Kraków, Poland). Venous blood was collected from the study participants twice, before and after the DiablakBeskid Extreme Triathlon 2016 (the Carpathians, Poland), and once from the control group for analysis of the selected blood indicators. Statistically significant changes were observed in the study group before and after the triathlon in morphological blood indicators, in the elongation index at the shear stress of 0.30 and 0.58 Pa, in levels of electrolytes, creatinine (mmol/l), serum protein parameters, and high-sensitivity troponin (ng/l). No such differences were reported for the remaining parameters. In turn, when comparing the study group before the triathlon with the control group, statistically significant differences were recorded in MCHC (g/dl), in the elongation index at the shear stress of 0.30 and 0.58 Pa, and Cl– (mmol/l) levels. No such differences were reported for the remaining parameters. Blood haematological and biochemical indicators in individuals that participate in triathlons characterize the actual range and direction of effort-related changes well and allow for the diagnosis of transient adaptive effects. Rheological parameters, involving the evaluation of erythrocyte deformability and aggregation, are useful for monitoring the particularly undesirable, short- and long-term effects of practicing extreme sports such as triathlons

3D PET image reconstruction based on Maximum Likelihood Estimation Method (MLEM) algorithm

Positron emission tomographs (PET) do not measure an image directly. Instead, they measure at the boundary of the field-of-view (FOV) of PET tomograph a sinogram that consists of measurements of the sums of all the counts along the lines connecting two detectors. As there is a multitude of detectors build-in typical PET tomograph structure, there are many possible detector pairs that pertain to the measurement. The problem is how to turn this measurement into an image (this is called imaging). Decisive improvement in PET image quality was reached with the introduction of iterative reconstruction techniques. This stage was reached already twenty years ago (with the advent of new powerful computing processors). However, three dimensional (3D) imaging remains still a challenge. The purpose of the image reconstruction algorithm is to process this imperfect count data for a large number (many millions) of lines-of-responce (LOR) and millions of detected photons to produce an image showing the distribution of the labeled molecules in space.Comment: 10 pages, 7 figure