University Press, 2000. Řehůřek R., Sojka P. (2010) Software Framework for Topic Modelling with Large Corpora, Proceedings of the LREC 2010 Workshop on New Challenges for NLP Frameworks, 2010. Reuters Corpus, [Online]. http://about.reuters.com/researchandstandards/corpus/, Released in November 2000. Schoelkopf B., Smola A. (2002) Learning with Kernels, Support Vector Machines, MIT Press, London, 2002. Vintan L., Morariu D., Cretulescu R., Vintan M.. (2017) An Extension of the VSM Documents Representation, International Journal of Computers, Communications & Control, ISSN
In the paper the possibilities of process re-organizing in relation to simple principles for limiting waste in the production cycle have been presented. Based on value stream mapping and monitoring of performance indicators, the possibilities of changes identification of in the assembly line process have been presented. Furthermore, based on the availability, performance and quality values, it has been proved that relatively small changes can have a very positive effect on the assembly process. Based on the OEE coefficient, it has been found that the proposed changes improved the process's efficiency by more than 20%.
In the paper, the method of the production process improvement with the use of lean production tools has been presented. The Value Stream Mapping (VSM) for the cardboard packaging production process has been presented. On the basis of the current state map (CSM), areas for improvement have been designated – 5 organizational changes of the process were marked out. To minimize the three basic losses excessive storage, unnecessary movement and delays, the changes were introduced in the method of inter-operative transport, supervision of the storage condition (input and output of the process), control at the processing operation and the use of a production loop. As a result of the changes, it is possible to shorten the process time, shorten the total time of operations adding value and reduce the number of non-compliant products.
Lean Management is currently one of the best-known and is the most widely used management concepts in production enterprises. Lean creates such a culture of work in an organization that makes all participants in the organization interested in raising the level of quality, reducing costs and delivery time. However, there is no information about the influence of lean tools on the level of safety in production organizations. The paper presents the influence of five lean tools on the safety level by the example of metal manufacturing organization. The number of potentially dangerous situations and the number of accidents were taken as the measure of safety level. The obtained results indicates that the most important for the safety level is 5S, TPM while Kaizen, Poka-Yoka and VSM are smaller. The paper aims to broaden the knowledge about the dependence of the use of lean tools on the level of occupational safety.
In this work, Ni substituted magnesium spinel ferrites having general formula Mg1−xNixFe2O4 (where x = 0.0, 0.1, 0.15, 0.2, 0.25 and 0.3) were synthesized by standard solid state reaction method. All the samples were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), vibrating sample magnetometer (VSM), DC resistivity measurements. X-ray diffraction analysis confirmed the single spinel phase. The lattice constant decreased with increasing Ni content due to the difference in the ionic radii of Mg2+ and Ni2+ ions. The FT-IR spectra reveled two prominent frequency bands in the wave number range of 400 cm−1 to 600 cm−1, which confirmed the cubic spinel structure of obtained compound and completion of chemical reaction. Magnetic studies revealed that the saturation magnetization increased with the substitution of Ni. The increase in magnetization was explained on the basis of distribution of magnetic and non-magnetic cations among A and B sites of the spinel lattice. A significant influence of cation distribution on DC electrical resistivity and activation energy was observed.
QPI 2019, volume 1, issue 1, pp. 537-544
IMPROVEMENT OF MANUAL ASSEMBLY LINE BASED
ON VALUE STREAM MAPPING (VSM) AND EFECTIVENESS
Date of submission of the article to the Editor: 25/04/2019
Date of acceptance of the article by the Editor: 21/05/2019
Dorota Klimecka-Tatar1 – orcid id: 0000-0002-7458-1675
Vishvajit Shinde2 – orcid id: 0000-0002-2085-4957
1Czestochowa University of Technology, Poland
2University of Pune, India
In the paper the possibilities of process re
The basic objective of the paper is to show that seniors (even in the age 70+) need not be treated just as a burden or as an object of social care and health care (which is, of course, important as well), but that they can be an important production factor in the traditional meaning of the concept in economic theory and can form a valuable component of an intellectual capital in a knowledge-based society. Objective reason of the growing interest in these issues is the aging of population during the last decades (especially in developed countries) and a greater availability of highly skilled seniors, that although meet the requirements to go retired, prefer to work longer and seek in the work (similarly as during their previous active years) a way of selfactualization and a source of vital energy. Keeping employed these seniors can be also economically effective for organizations.
Thermal treatment, undertaken at just below the crystallization temperature, has led to nanocrystallization and has had a significant impact on the shape of the hyperfine field induction distributions of Fe62Co10Y8B20 alloy and on its soft magnetic properties. In the amorphous ferromagnetic alloys, it is possible to indirectly determine the effect of the structure stresses, resulting from the presence of structural defects, on the soft magnetic properties of these materials. It has been found that a change in the parameters associated with the presence of structural defects affects the shape of the hyperfine field distributions of 57Fe.
Superparamagnetic iron oxide nanoparticles (SPIONs) have been synthesized using co-precipitation method. Their microstructure and dielectric properties were studied. The sugar solutions like glucose, fructose and sucrose were used as stabilizers to control the size of the SPIONs. The crystal structure and grain size of the particles were determined by X-ray diffraction. The magnetic studies of the samples were carried out using the vibrating sample magnetometer and their surface morphology was studied by HRTEM, FE-SEM and zeta potential. The dielectric properties of glucose-SPIONs (GF), fructose-SPIONs (FF) and sucrose-SPIONs (SF) were investigated in the frequency range of 10 Hz to 5 MHz at selected temperatures. The FF showed a high dielectric constant of 62 at 1 MHz and the dielectric properties of SPIONs were found to have been significantly improved, especially in the low frequency regime according to the Maxwell-Wagner interfacial polarization. The AC conductivity measurements revealed that the electrical conduction depends on both frequency and temperature. Impedance analysis was carried out using Cole-Cole plot and the conduction mechanism of the studied compounds was explained. R and C values were further calculated using RC-circuit.
One of the five primary objectives of the European Union within the framework of Europe 2020 is to increase the proportion of the tertiary educated population. The research task titled “The motivation of the student in the 21st century” is intended to address the factors that have both an impact on the decision of students to pursue higher studies and affect the choice of a specific field of study and a preferred form of study. The stimulus to the exploration was sparked by the mentioned EU initiative, interesting statistical data, the growing number of students studying in the external form compared to the daily option, and an increase of students from abroad. Therefore, it is necessary to identify the causes of these trends. Motivation of students is not researched in a systematic way in Slovakia, even though it is an important factor in a student’s decisionmaking process to study. Information was obtained by a questionnaire distributed to 105 students, evaluated using SPSS software and application of descriptive statistics.