quality requirements
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2022 ◽  
Vol 55 (2) ◽  
pp. 137-158
Author(s):  
Agnieszka Klasa

Publikacja prezentuje analizę zagrożeń i ryzyka w systemie bezpieczeństwa logistycznego prowadzonego na podstawie międzynarodowych wymagań jakościowych. Określono problem badawczy oraz pytania badawcze. Wskazano także cel badań, hipotezy badawcze, przedmiot i obszar badań oraz określono próbę badawczą. Przedstawione zostały definicje zagrożenia i ryzyka oraz metodyka analizy i procesu zarządzania nimi w przedsiębiorstwie. W dalszej części artykułu zaprezentowano miejsce analizy zagrożeń i ryzyka w międzynarodowych standardach jakościowych. Przybliżono mechanizm analizy ryzyka jako narzędzia zapewnienia jakości w brytyjskich, amerykańskich i polskich procedurach obronnych. Na koniec przedstawiono przykład wdrażania wymagań systemu zarządzania jakością dla przemysłu lotniczego, kosmicznego i obronnego w polskim przedsiębiorstwie. Analiza zagrożeń i ryzyka z nimi związanego na przykładzie i w oparciu o standardy międzynarodowe ma na celu uzasadnienie postawionych hipotez dotyczących wpływu analizy ryzyka na procesy decyzyjne w przedsiębiorstwie. Metody badawcze zastosowane to analiza przyczynowo - skutkowa, synteza informacji z zastosowaniem kojarzenia numerycznego i logicznego celem zebrania uporządkowanego materiału dowodowego. Rezultatem badań jest potwierdzenie postawionych hipotez dla procesu zarządzania ryzykiem. Proces zarządzania ryzykiem jest procesem ciągłym i wpływa na osiąganie celów strategicznych przedsiębiorstwa. Kluczowym czynnikiem dla faktycznego wdrożenia analizy zagrożeń i ryzyka w przedsiębiorstwie jest przeszkolony personel stosownie do zajmowanych stanowisk. Dodatkowym czynnikiem jest sposób zrozumienie i wdrożenie procesu zarządzania ryzykiem w przedsiębiorstwie.


Polymers ◽  
2022 ◽  
Vol 14 (2) ◽  
pp. 284
Author(s):  
Maria Pilar Carbonell Blasco ◽  
María Ángeles Pérez Limiñana ◽  
Carlos Ruzafa Silvestre ◽  
Elena Orgilés Calpena ◽  
Francisca Arán Aís

The aim of this work is to develop sustainable reactive polyurethane hot melt adhesives (HMPUR) for footwear applications based on biobased polyols as renewable resources, where ma-croglycol mixtures of polyadipate of 1,4-butanediol, polypropylene and different biobased polyols were employed and further reacted with 4-4′-diphenylmethane diisocyanate. The different reactive polyurethane hot melt adhesives obtained were characterized with different experimental techniques, such as Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), softening temperature and melting viscosity. Finally, their adhesion properties were measured from T-peel tests on leather/HMPUR adhesives/SBR rubber joints in order to establish the viability of the used biobased polyols and the amount of these polyols that could be added to reactive polyurethane hot melt adhesives satisfactorily to meet the quality requirements of footwear joints. All biobased polyols and percentages added to the polyurethane adhesive formulations successfully met the quality requirements of footwear, being comparable to traditional adhesives currently used in footwear joints in terms of final strength. Therefore, these new sustainable polyurethane adhesives can be considered as suitable and sustainable alternatives to the adhesives commonly used in footwear joints.


2022 ◽  
pp. 726-745
Author(s):  
Priti Srinivas Sajja ◽  
Rajendra A. Akerkar

Every business has an underlying information system. Quality and creditability of a system depend mainly on provided requirements. Good quality requirements of a system increase the degree of quality of the system. Hence, requirements determinations is of prime importance. Inadequate and misunderstood requirements are major problems in requirements determination. Major stakeholders of the requirements are non-computer professional users, who may provide imprecise, vague, and ambiguous requirements. Further, the system development process may be partly automated and based on platform such as web or Semantic Web. In this case, a proper ontology to represent requirements is needed. The chapter proposes a fuzzy RDF/XML-based ontology to document various requirements. A generic architecture of requirements management system is also provided. To demonstrate the presented approach, a case of student monitoring and learning is presented with sample software requirements specifications and interfaces to collect requirements. The chapter concludes with advantages, applications, and future enhancements.


2022 ◽  
Vol 1211 (1) ◽  
pp. 012003
Author(s):  
V K Lyubov ◽  
A N Popov ◽  
E I Popova

Abstract A comprehensive study of the efficiency of the 1.5 MW Arimax Bio Energy hot water boiler operating on wood pellets with a high amount of fines has been carried out. Fuel characteristics and its compliance with the quality requirements of Russian and European standards have been investigated. The components of the heat balance and emission of harmful substances have been determined. Thermovision study of the boiler was carried out. The comprehensive study showed that the boiler provides sufficiently high technical and economic performance and minimal emissions of nitrogen oxides and carbon monoxide. However, the high amount of fines in the pellets significantly increases the emissions of particulate matter and especially black carbon into the environment.


Author(s):  
Eriberto Oliveira do Nascimento ◽  
Paulo Henrique Trombetta Zannin

The acoustic quality in a classroom directly impacts the educational relationship between the student and the teacher, reducing speech intelligibility. In addition, inadequate acoustic comfort burdens the vocal health of teachers. This study evaluated a classroom at the Federal University of Paraná, Campus Centro Politécnico, to verify its acoustic quality. The measurements of the acoustics descriptors: Reverberation Time (RT), Definition (D50), Central Time (Ts), Early Decay Time (EDT) were performed according to the ISO 3382-2 standard, concerning Noise Curves (NC) and Background Noise (BGN) these were evaluated by the  NBR 10152 and S12.2 standards. The Speech Transmission Index (STI) was measured according to IEC 60268-16 and evaluated according to ISO 9921. The useful-detrimental ratio (U50) and the other descriptors were simulated in the ODEON software version 11. Thus, the results showed that the evaluated room did not meet the minimum requirements in terms of acoustic quality, for the descriptors RT, STI, Ts, D50, RF, and NC. Simultaneously, the RT and STI were also outside the limits established by the German and Finnish standards. Therefore, it is concluded that the evaluated classroom did not reach the minimum acoustic quality requirements.


Algorithms ◽  
2021 ◽  
Vol 15 (1) ◽  
pp. 2
Author(s):  
Luka Grubišić ◽  
Domagoj Lacmanović ◽  
Josip Tambača

This paper presents an algorithm for the fully automatic mesh generation for the finite element analysis of ships and offshore structures. The quality requirements on the mesh generator are imposed by the acceptance criteria of the classification societies as well as the need to avoid shear locking when using low degree shell elements. The meshing algorithm will be generating quadrilateral dominated meshes (consisting of quads and triangles) and the mesh quality requirements mandate that quadrilaterals with internal angles close to 90° are to be preferred. The geometry is described by a dictionary containing points, rods, surfaces, and openings. The first part of the proposed method consists of an algorithm to automatically clean the geometry. The corrected geometry is then meshed by the frontal Delaunay mesh generator as implemented in the gmsh package. We present a heuristic method to precondition the cross field of the fronatal quadrilateral mesher. In addition, the influence of the order in which the plates are meshed will be explored as a preconditioning step.


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