Analysis of efficiency of Lean Manufacturing and Six Sigma in a production enterprise

The aim of the paper is to identify, on the basis of selected examples, the effectiveness of Lean Manufacturing (LM) and Six Sigma (SS) techniques in a large-production enterprise characterized by low-volume production, a wide product range, stabilized manufacturing technology and a so-called "brownfield" site. Many scholars have attempted to answer which approach, LM or SS, is more effective in a production enterprise. The authors of the paper aim to answer this question on the basis of a detailed analysis of efficiency of implementation of both techniques. The amount of savings generated from undertaken projects and increase of profitability of the analysed production system have served as performance measurements

Assessment of ductile iron casting process with the use of the DRSA method

The paper introduces a concept of assessment of a ductile iron casting process with use of the rule-based approach, known as DRSA (dominance-based rough set approach). The research was conducted in a large Polish foundry. The collected data concern the chemical composition and mechanical properties of the used ductile cast iron. In the paper, a methodology of creating a rule-based moulding model for the tensile strength was proposed. The quality, sensitivity and accuracy of the model extracted from the data were examined. The studies proved its usefulness in the industrial practice and for aiding of the decision making process

Application of dominance-based rough set approach (DRSA) for quality prediction in a casting process

The main subject of the paper is a problem of capability assessment of a production process for manufacturing products fulfilling certain requirements. The paper presents theoretical assumptions of the DRSA method for classification of a process state based on so-called process state measures (e.g. process parameters, diagnostic signals, events). In the paper, results of application of the proposed methodology for assessment of capability of the nodular cast iron casting process are presented

New management systems as an instrument of implementation sustainable development concept at organizational level / Naujos valdymo sistemos kaip instrumentai įgyvendinant darnios plėtros koncepciją organizaciniu lygmeniu

Diversity of contemporary management concepts, short life duration of some of them, fashion of implementing popular solutions, indiscriminate adoption of management systems in companies simultaneously with a long period of waiting for positive effects of implemented changes and decreasing involvement of employees lead to the situation in which many companies still face unresolved dilemma of choosing the right strategy of acting that ensures sustainable development of a unit. Therefore, new solutions should be treated as one of the elements of organization improvement, not as an objective as such, and as the way of solving the existing problems. One of the ways of realizing sustainable development principles at the level of an organizational unit is implementation of normalized systems elaborated by International Organization for Standardization (ISO). The article presents a proposal of the way of implementing sustainable development concept at organizational level using three systems: quality, environmental, occupational health and safety management. Santrauka Šiuolaikinių valdymo koncepcijų įvairovė ir jų trumpalaikiškumas (kai kurių), polinkis įgyvendinti populiarius sprendimus, beatodairiškas valdymo sistemų diegimas ilgai laukiant teigiamų pokyčių, taip pat darbuotoju dalyvavimo, priimant sprendimus, mažinimas sukuria situaciją, kai daugelis bendrovių vis dar susiduria su neišspręsta dilema - pasirinkti tinkama strategiją darniam organizacijos vystymuisi užtikrinti. Todėl nauji sprendimai turėtų būti traktuojami kaip organizacijos tobulinimo elementai, o ne kaip panacėja esamoms problemoms išspręsti. Vienas darnaus vystymosi principų įgyvendinimo būdų ‐ diegti standartizuotas sistemas, parengtas Tarptautines standartizacijos organizacijos (ISO) įmonėse. Straipsnyje siūloma darnaus vystymosi koncepcija organizacijos lygmeniu įgyvendinti naudojant tris valdymo sistemas: kokybės, aplinkos apsaugos, darbuotojų saugos ir sveikatos valdymo. First published online: 09 Jun 2011 Reikšminiai žodžiai: darnus vystymasis, aplinkos valdymas, kokybės valdymas, saugos valdyma