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Janez Tratar,Franci Pusavec,Janez Kopac 대한기계학회 2014 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.28 No.11
Machining with robots represents a promising, highly flexible and cost effective alternative to standard machining and hand labour applicationswhen machining mid tolerance soft material end products. One of the most challenging issues is to know the vibration characteristicsin milling with the robots which greatly affect tool life. In general the technological bases of tool life expectancy while millingwith robot arms are not available or studied. That`s why the purpose of this paper is to investigate the influence of attained vibrationsanalysis during the milling process and correlated tool wear. Primarily the study is focused on tool wear according to the distance betweenthe milling position and the robot`s base. Results show that increasing distance between the robot's base and the milling positionsignificantly affects tool wear because of the attained vibrations in proportion to the increasing distance respectively. Tool wear has alsoproved to be greater in comparison to machining with CNC machine and applicable new information for woodworking industry.
Usan, Janez,Zizovic, Malisa The Youngnam Mathematical Society Korea 2002 East Asian mathematical journal Vol.18 No.2
In the paper the following propositions are proved. 1) If ($Q,{\cdot},e$) is a B-algebra, then there exists a group($Q,A,^{-1}$, 1) such that the following equalities hold e=1 and ${\cdot}=^{-1}A$, where $^{-1}A(x,y)=z{\Longleftrightarrow^{def}}A(z,y)=x$; and 2) If ($Q,A,^{-1}$, e) is a group, then ($Q,^{-1}A$, e) is a B-algebra.
Synthesis and Magnetic Properties of Hematite Particles in a “Nanomedusa” Morphology
Lee, Jin Bae,Kim, Hae Jin,Luž,nik, Janez,Jelen, Andreja,Pajić,, Damir,Wencka, Magdalena,Jaglič,ić,, Zvonko,Meden, Anton,Dolinš,ek, Janez Hindawi Limited 2014 Journal of nanomaterials Vol.2014 No.-
<P>We present the synthesis, characterization, and magnetic properties of hematite particles in a peculiar “nanomedusa” morphology. The particles were prepared from an iron-silica complex by a hydrothermal process in a solution consisting of ethyl acetate and ethanol. The particles’ morphology, structure, and chemical composition were investigated by transmission electron microscopy, powder X-ray diffraction, and scanning electron microscope equipped with an energy-dispersive X-ray spectrometer. The “hairy” particles consist of a spherical-like core of about 100 nm diameter and fibrous exterior composed of thin “legs” of 5 nm diameter grown along one preferential direction. The particles’ cores are crystalline and undergo a magnetic phase transition to a weakly ferromagnetic state at a temperature of 930 K that matches reasonably the Néel temperature of bulk hematite. However, unlike bulk hematite that undergoes Morin transition to an antiferromagnetic state around room temperature and small hematite nanoparticles that are superparamagnetic, the “nanomedusa” particles remain weakly ferromagnetic down to the lowest investigated temperature of 2 K. Each particle thus represents a nanodimensional “hairy” ferromagnet in a very broad temperature interval, extending much above the room temperature. Such high-temperature ferromagnetic nanoparticles are not frequently found among the nanomaterials.</P>
Lovro Sinkovič,Janez Hribar,Lea Demšar,Rajko Vidrih,Marijan Nečemer,Peter Kump,Dragan Žnidarčič 한국원예학회 2017 Horticulture, Environment, and Biotechnology Vol.58 No.3
The aim of this study was to measure the bioactive compounds and elemental composition in the leaves ofdifferent chicory (Cichoruim intybus L.) cultivars after hydroponic forcing. Five chicory cultivars were studied: threered coloured cultivars: ‘Treviso’, ‘Verona’, and ‘Anivip’; one red-spotted cultivar ‘Castelfranco’; and one green cultivar‘Monivip’. Developing chicory roots were forced in three different nutrient solutions enriched in nitrogen (+N), enrichedin potassium (+N/K), or enriched in phosphorus (+N/P/K) to obtain new vegetative apical buds called chicons, or‘Belgian endive’. Each of the nutrient solutions was used at three concentrations: 1%, 2%, and 3%. Fifty leaf samples(5 cultivars × 10 nutrient solutions) were used for analyses. Total phenolic content, antioxidant potential, and total flavonoidcontent were determined using spectrophotometric methods at the appropriate wavelengths, and multi-elemental analysis(P, S, Cl, K, Ca, Fe, Zn, Mn, Rb, Br, and Sr) was conducted using energy dispersive X-ray fluorescence spectroscopy. The highest total phenolic and total flavonoid contents of the chicons were observed with the nutrient solution enrichedin K, followed by the solution enriched in N, and P. The highest antioxidant potential was observed with the nutrientsolution enriched in N. Multi-element analysis detected the major macroelements (> 1 g・kg-1dry weight) as K, P, Ca,Cl, and S. The nutrient solutions enriched in K and P generally showed the highest contents of these two macroelementsin the chicons. Linear discriminant analysis for 19 parameters derived from 43 samples of five cultivars ofchicons showed good discrimination between cultivars and nutrient solutions used for hydroponic forcing.
ON DOMINATION NUMBERS OF GRAPH BUNDLES
Zmazek, Blaz,Zerovnik, Janez 한국전산응용수학회 2006 Journal of applied mathematics & informatics Vol.22 No.1
Let ${\gamma}$(G) be the domination number of a graph G. It is shown that for any $k {\ge} 0$ there exists a Cartesian graph bundle $B{\Box}_{\varphi}F$ such that ${\gamma}(B{\Box}_{\varphi}F) ={\gamma}(B){\gamma}(F)-2k$. The domination numbers of Cartesian bundles of two cycles are determined exactly when the fibre graph is a triangle or a square. A statement similar to Vizing's conjecture on strong graph bundles is shown not to be true by proving the inequality ${\gamma}(B{\bigotimes}_{\varphi}F){\le}{\gamma}(B){\gamma}(F)$ for strong graph bundles. Examples of graphs Band F with ${\gamma}(B{\bigotimes}_{\varphi}F) < {\gamma}(B){\gamma}(F)$ are given.
3D cutting tool-wear monitoring in the process
Luka Čerče,Franci Pušavec,Janez Kopač 대한기계학회 2015 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.29 No.9
The tool-wear of cutting tools has a very strong impact on the product quality as well as efficiency of the machining processes. Therefore,it in-the process characterization is crucial. This paper presents an innovative and reliable direct measuring procedure for measuringspatial cutting tool-wear with usage of laser profile sensor. The technique provides possibility for determination of 3D wear profiles, asadvantage to currently used 2D techniques. The influence of the orientation of measurement head on the accuracy and the amount ofcaptured reliable data was examined and the optimal setup of the measuring system was defined. Further, a special clamping system wasdesigned to mount the measurement device on the machine tool turret. To test the measurement system, tool-life experiment was performed. Additionally, a new tool-life criterion was developed, including spatial characteristics of the tool-wear. The results showed thatnovel tool-wear and tool-life diagnostic represent objective and robust estimator of the machining process. Additionally, such automationof tool-wear diagnostics on machine tool provides higher productivity and quality of the machining process.
Bidirectional Artificial Neural Networks for Mobile-Phone Fraud Detection
Andrej Krenker,Mojca Volk,Urban Sedlar,Janez Bešter,Andrej Kos 한국전자통신연구원 2009 ETRI Journal Vol.31 No.1
We propose a system for mobile-phone fraud detection based on a bidirectional artificial neural network (bi-ANN). The key advantage of such a system is the ability to detect fraud not only by offline processing of call detail records (CDR), but also in real time. The core of the system is a bi-ANN that predicts the behavior of individual mobile-phone users. We determined that the bi-ANN is capable of predicting complex time series (Call_Duration parameter) that are stored in the CDR.
방현우,Woosuk Yoo,최영하,유천열,홍정일,Janez Dolin sek,정명화 한국물리학회 2016 Current Applied Physics Vol.16 No.1
The tetragonal Mn3Ga films exhibited high perpendicular magnetic anisotropy, low saturation magnetization, and high spin polarization, which satisfy the criteria of spin-transfer-torque based devices. For practical device applications, it is necessary to improve the interface nature and optimize the deposition conditions. We fabricated thin films of tetragonal Mn3Ga directly on MgO(100) without any buffer layer by using DC/RF magnetron sputtering method. We investigated the crystallinity, microstructure, and magnetic properties with varying the deposition conditions; such as deposition temperature (350 e450 C), RF power (25e40 W), and Ar gas pressure (2e7 mTorr). X-ray diffraction data revealed that the growth direction is perpendicular to the film plane, i.e., the c axis. Scanning electron microscope images showed that the top surface is flat with a maximum thickness of 290 nm. The optimal deposition conditions are 400 C, 35 W, and 5 mTorr in our sputtering system. For the field perpendicular to the film plane, clear hysteresis loop was observed with the saturation magnetization MS ¼ 100 emu/cc at room temperature. By extrapolating the hard magnetization data for the field parallel to the film plane, the anisotropic energy was estimated about K1 ¼ 1 106 J/m3.