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Wireless Sensor Networks with randomized parameters
Mikołaj Karpi?ski,Paweł Raif,Stanisław Rajba,Teresa Rajba,Vasyl Martsenyuk 제어로봇시스템학회 2016 제어로봇시스템학회 국제학술대회 논문집 Vol.2016 No.10
In this paper we present a model of single-hop type wireless sensor network with random access and oneway transmission. In the paper, we analyze the WSN single-hop network using one single radio frequency, such that all nodes are divided into several groups depending on the average time between the transmissions. We replaced deterministic number of nodes in groups by random variables. We apply the Poisson Arrivals See Time Averages (PASTA) to modeling the WSN. We present the formula for the collision probability in the new model. The purpose of this approach is to match better the network model with random access to real world applications. In the paper we present an application of Wireless Sensor Network with random access and one-way transmission to monitoring hospital patients, such that all nodes are divided into several groups depending on the average time between the transmission due to the different state of health of patients.
WARF: Component Based Platform for Wireless Mesh Networks
Sławomir Kukli?ski,Paweł Radziszewski,Jacek Wytr?bowicz 한국산학기술학회 2011 SmartCR Vol.1 No.2
In this paper, we propose a Wireless and Autonomic Routing Framework (WARF), designed for the deployment of a new generation of routing protocols in wireless mesh networks. The framework supports cross-layer operations, multiple radio interfaces, real-time resource monitoring, dynamic resource allocation and multipath adaptive forwarding. WARF nodes are decomposed into four components, contributing to the overall framework behavior: Resource Maintenance, Route Maintenance, Data Forwarding, and Policy Control. The framework is ready for a simultaneous deployment of different routing protocols or their components. It is based on common features found in existing routing protocols. The protocols can be implemented depending on the network topology properties (static, dynamic), usage mode (unicast, broadcast), or other properties (mobility, QoS etc.). Due to the real-time requirements and preference for distributed operations, IPv6 with some extensions is used as a transport mechanism for control data dissemination. In this paper, an example of a WARF implementation on Linux OpenWRT is described, and a message sequence chart of a generic protocol for radio channel management, which uses WARF control messages, is presented.
Determination of representative volume element in concrete under tensile deformation
L/ . Skarz· yn´ski,J. Tejchman 사단법인 한국계산역학회 2012 Computers and Concrete, An International Journal Vol.9 No.1
The 2D representative volume element (RVE) for softening quasi-brittle materials like concrete is determined. Two alternative methods are presented to determine a size of RVE in concrete subjected to uniaxial tension by taking into account strain localization. Concrete is described as a heterogeneous threephase material composed of aggregate, cement matrix and bond. The plane strain FE calculations of strain localization at meso-scale are carried out with an isotropic damage model with non-local softening.
Словообразовательные гнезда, мотивированные глаголами (предварительный анализ)
Mirosław Skarżyński 한국슬라브어학회 2006 슬라브어연구 Vol.11 No.-
Derivational nests motivated by verbs (preliminary research) Mirosław Skarżyński Among methods used for a description of derivational system, Slavonic studies use one called „nests method”. It concentrates on groups of words (called „derivational nests”) connected by derivational relation. The method enables lexicographical description of derivation, and was already used in deri-vational dictionaries – Russian (Tichonov 1986), Ukrainian (Karpilovska 2002), Slovak (Sokolova et al. 2005) and Polish (Vogelgesang 2001; Jadacka et al. 2001; Skarżyński et al. 2004; Skarżyński 2004). The article presents results of preliminary research on derivational nests built around Polish verbs. The author, using a quantitative method, worked out general characteristic of deverbative derivation, defined a set of derivational models and their productivity, showed central and peripheral zones of deverbative derivation in contemporary Polish language.
OGLE-2005-BLG-071Lb, THE MOST MASSIVE M DWARF PLANETARY COMPANION?
Dong, Subo,Gould, Andrew,Udalski, Andrzej,Anderson, Jay,Christie, G. W.,Gaudi, B. S.,Jaroszyń,ski, M.,Kubiak, M.,Szymań,ski, M. K.,Pietrzyń,ski, G.,Soszyń,ski, I.,Szewczyk, O.,Ulac IOP Publishing 2009 The Astrophysical journal Vol.695 No.2
Hwang, K.‐,H.,Han, C.,Udalski, A.,Sumi, T.,Gould, A.,Jaroszyń,ski, M.,Kubiak, M.,Szymań,ski, M. K.,Pietrzyń,ski, G.,Soszyń,ski, I.,Szewczyk, O.,Ulaczyk, K.,Wyrzykowski, Blackwell Publishing Ltd 2011 MONTHLY NOTICES- ROYAL ASTRONOMICAL SOCIETY Vol.413 No.2
<P><B>ABSTRACT</B></P><P>We report the result of the analysis of the light curve of a caustic‐crossing binary‐lens microlensing event OGLE‐2009‐BLG‐023/MOA‐2009‐BLG‐028. Even though the event was observed solely by survey experiments, we could uniquely determine the mass of the lens and distance to it by simultaneously measuring the Einstein radius and lens parallax. From this, we find that the lens system is composed of M‐type dwarfs with masses (0.50 ± 0.07) and (0.15 ± 0.02) M<SUB>⊙</SUB> located in the Galactic disc with a distance of ∼1.8 kpc toward the Galactic bulge direction. The event demonstrates that physical lens parameters of binary‐lens events can be routinely determined from future high‐cadence lensing surveys and thus microlensing can provide a new way to study Galactic binaries.</P>
FRICTIONAL CHARACTERISTICS OF STEEL SHEETS USED IN AUTOMOTIVE INDUSTRY
T. TRZEPIECI SKI,A. BAZAN,H. G. LEMU 한국자동차공학회 2015 International journal of automotive technology Vol.16 No.5
In this paper the results of experimental tests aimed to determine the friction coefficient in sheet metal forming operations for various sheet metal materials and at different operative conditions are presented. The research has considered the frictional characterization of three kinds of drawing quality steels that are commonly used in automotive industry. These are a drawing quality steel (DQ), a deep drawing quality steel (DDQ), and extra deep drawing quality steel (EDDQ). For measurement of the sheet surface topography, a 3D stylus instrument Alicona InfiniteFocus was used. To determine the friction coefficient three tribological tests, i.e. a strip drawing test, a draw bead test and a pin-on-disc tribometer, have been conducted. The experimental results have ascertained several relationships showing the effect of sheet metal surface roughness, lubricant conditions and sheet orientation on the value of friction coefficient in sheet metal forming processes. The results further showed that the surface topography and sample orientation in the rolling direction of the sheet are significant factors that influence the friction coefficient. It was found that the tested steel sheets, selected from automotive industry applications, exhibit anisotropic resistance to the friction corresponding to the measured orientation in relation to the rolling direction of the sheet.