Applied Mechanics and Materials Vol. 309

Abstract: Nowadays the wireless communication networks are the bigger part in the communication area. It is very important to choose the best place for the wireless nodes. To support the placement of these devices I wanted to create a signal strength measurement system that I implemented on ZigBee platform with GPS positioning.

Abstract: In the light of the strategy Europe 2020, which is focused on smart, sustainable and inclusive growth [ and the document: Renewed EU Strategy for Corporate Social Responsibility (CSR) for the period 2011 to 2014, together with the opinion of the Section for Employment, Social Affairs and Citizenship [ a targeted focus on CSR becomes the objective necessity for the companies. Through the CSR companies can achieved the long-term confidence of employees and customers, thereby the environment that allows innovation and growth can create. According to the idea of: Think globally, act locally is necessary to act socially and responsibly already at grassroots level of management hierarchy, whereby during the fulfilment the social aspect of corporate social responsibility is necessary to respect the status of employees, their physical and mental possibilities.

Abstract: The importance of forming and implementation the socially responsible society is highlighted by report on the creation of conditions for CSR in Slovakia. Recommendations arising from the report defines the starting points, from which for the article is chosen motivate companies to attend the United Nations Global Compact and other networks that support CSR, as well as the need for the integration of CSR and sustainable development issues in educational process [1, 2, 3, . Companies that support the initiative, as well as direct implementation of the CSR must take action leading to its successful implementation in all areas of business processes, including the logistics and material flow. In the analysis of material flows should be respected the limiting factor of physical load in handling and transport activities that affect the setting of time norm that is required for realization of work activity. The time analysis of material flow allows the identification of time consumption for individual work actions, which are needed during realization of work operation. For time analysis of material flow realization we can use the Method Time Measurement. More specifically, we can use the Method Time Measurement Logistic, which is the subject of this article. Selection of the method is a logical step, which resulted from the needed of responsibility in area of exact decision-making and objective assessment of the efficiency of material flows for minimizing the impact of risk factors. The article provides the information about characteristic of mentioned method, it describe the possible areas of using the method and presents the illustrative example of practical application of method for time analysis of material flow, whereby the main emphasis is on the social aspect of corporate social responsibility through ergonomics and the effectiveness using of time during the work operations realization within the framework of material flow

Abstract: Currently, transportation is an integral part of any national economy, it accounts for the flow of raw materials and finished products from the original suppliers to the end users. Transport system is also very close linked to the society. It is not only an important branch of any national economy, but it is a system without which the modern economy cannot imagine any further activity. However, in addition to the benefits offered by the transport (the possibility of transport of goods and people, the mobility of societies and time saving), transport is also responsible for many adverse effects, for example its negative impact on the environment. But, today, an increasing number of societies and local authorities are aware that the pursuit of sustainable transport will bring tangible results, not only for the environment but also for the economy and society. This article presents the city of Czestochowa and activities of local authorities in order to balance the transport system in the city. The used methodology calculates the basic indicators of sustainable transport for the city of Czestochowa, then the investment in the transport system will described, together with their expected impact on the level of sustainability.

Abstract: So far the objective of the concept of TPM has been to increase the effectiveness of production by means of involvement of operative workers at different levels in the assigned tasks. As a result, an enterprise which was focused on profits coming from its basic activity minimized production loss by implementing some preventive measures with regard to technical and technological equipment. Nowadays, the application of the concept of TPM in the area of primary processes may be insufficient to realize the assigned production targets. In the paper there are characterized the support processes which, along with the use of the principles of TPM, constitute a coherent idea while aiming at minimizing loss and not only the production loss.

Abstract: A four-stage methodological framework useful to analyze the performance of a product development process, with a focus on the information flow inefficiencies is presented. The formal and informal communication exchange between interacting tasks is captured through the Dependency Structure Matrix (DSM) representation, while the properties of the information flow structure are explored calculating metrics of Social Network Analysis (SNA). Information exchange inefficiency of process tasks is calculated performing Data Envelopment Analysis (DEA).

Abstract: This article deals with knowledge discovery in databases (abbr. KDD) and methodology of this process. The authors give an identification of production parameters and their influence on a production process. Knowledge discovery in the production databases is minimally used for the process of planning and control. There are many problems that occur in the production process. It is important to indentify the impact of manufacturing parameters on the system for managers. New discovered knowledge from production systems will help make the right decision to fulfill the objectives. Using the KDD in the control of production systems, it can be achieved better understanding of system control and can help predict a future behavior of system. The authors formulated general knowledge for improve parameters of analyzed production process. The objectives, steps and some results of the project are presented in this article

Abstract: Nowadays, production scheduling is a greatly debated field of operation research due its potential benefits for improving manufacturing performance. Production scheduling, however, despite the increasing use of APS (Advanced Planning and scheduling Systems) and MES (Manufacturing Enterprise Systems) is still underestimated and one frequently encounters more or less intuitive scheduling using excel spread sheets at workshop level, mainly in SME (Small and Medium Enterprises). Some of the main reasons for this are the complexity of related algorithms and the timespan of the optimization manufacturing operation sequence. The complexity of the algorithms usually leads to a number of operators which are difficult to set up for a usual workshop foreman or manufacturing planner. That is why dispatching rules are widely used in comparison with advanced heuristics, such as Evolution Algorithms (EA). Therefore, operation research should not focus only on getting the best values of the objective function by problem based operators, but also on industrial practice requirements such as operator simplicity and a low timespan of the optimization. This article briefly introduces key principles of the scheduling system developed for the Job Shop Scheduling Problem (JSSP) type of manufacturing. An implemented EA with random key representation, clone and incest control and chromosome repair algorithm is briefly explained. Further, the test results of the evolution operator (e.g. crossover and selection) are presented with respect to the value of the objective function and timespan of the optimization. The research goal is to develop a principle of automatic optimization using EA, where the single parameter to set is required optimization timespan.

Abstract: A fast and efficient way of handling and storing components, raw materials, semi-finished and finished products play a significant role in the development of transport, storage and distribution design within the supply chain. One of the most important issues in storage and transport processes is the formation of unit loads. Our main goal is to give a mathematical description of a model involving the major factors of the unit load formation. The optimization process is exhibited applying the determined objective functions and constraints related to the basic tasks.

Abstract: This paper deals with research in computer simulation of manufacturing processes. The paper summarizes the procedures associated with developing the model, experimenting with and evaluating the model results. The key area is of experimentation with the simulation model and evaluation using indicators or multi-criteria functions. With regards to the experiment the crucial variables are the simulation model. The key ideas are to set the number of variables, depending on what a given simulation will be. For example, when introducing new technology into production, modify the type of warehouse, saving workers, thus economizing. The simulation models for the operational management uses simplified models, if possible, a minimum number of variables to obtain the result in shortest possible time. These models are more user friendly and the course will be conducted mostly in the background. An example of a criteria function is the number of parts produced or production time. Multi-criteria function has given us the opportunity to make better quality decisions. It is based on the composition of several parameters, including their weight to one end point. The type of evaluation functions, whether it is an indicator or criteria function is selected and based on customer requirements. In most cases it is recommended to use the multi-dimensional function. It gives us a more comprehensive view of the results from the model and facilitates decision-making. The result of this paper is a display of setting parameters for the experimentation on a sample model. Furthermore, the comparisons of results with a multi-criteria objective function and one-criterion indicator.