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Requirements engineering as the foundation for the success of substantial shipbuilding projects

Ficon K.

Scientific Journal of the Military University of Land Forces

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2018

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Vol. 50, No. 3(189)

127--143

EN

The paper presents the general principles of requirements engineering with particular attention for the requirements specification presented on the example of an ambitious national program for the fleet expansion of the Polish Navy. The introduction outlines the origins of requirements engineering and its strong relationships with software engineering. It appears that most large IT projects usually struggle to meet the precisely formulated criteria of requirements engineering, which results in the tremendous waste of project resources. Next the concept of requirements and good practices in the preparation of requirements specifications is formulated. Later the example of the 15-year history of the Polish Gawron-class corvette, Project 621, is used to illustrate how systematic violations of the cardinal principles of requirements engineering and disregard for regulations can lead to major losses and consequently to suspending the whole project. An emergency solution was planned to conduct the thorough modification of the project so as to complete this very costly investment (about PLN 1 billion) and construct a much weaker patrol vessel – Ślązak, Project 621/M. The main research thesis can be limited to the statement that amateur and improvised requirements specification in the case of a large shipbuilding project, which was mainly based on socio-political needs, leads directly to the collapse of the project and significant material losses accompanied by the painful embarrassment of state bodies on an international scale.

2

Calculation of the deadlines for nesting with the possibility of combining orders

Jardzioch A., Jaskowski J.

Management Systems in Production Engineering

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2015

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nr 1 (17)

22--27

EN

This paper describes the problems associated with determining deadlines for handling production orders during the orders combination process in order to optimize nesting. The analyzed problems relate to an automated nesting system in which production orders come in via the Internet and are processed automatically, and with minimum operator intervention. The article describes the issues of cutting optimization in the manufacturing system based on a water cutter. The optimization process is closely associated with the generation of production schedules for current orders base. Particular attention is focused on the analysis of problems arising from the omission of the human role in the processing of orders, scheduling and decision-making processes.

PL

Artykuł opisuje problemy związane z określeniem terminów zakończenia obróbki zleceń produkcyjnych podczas możliwości łączenia zleceń w celu optymalizacji rozkroju arkusza. Analizowane problemy dotyczą zautomatyzowanego systemu wycinania blach w którym zlecenia produkcyjne napływają drogą internetową i są przetwarzane w sposób automatyczny a ingerencja operatora jest ograniczona do minimum. W artykule opisano zagadnienia optymalizacji rozkrojów w systemie wytwarzania opartym o wycinarkę wodną. Proces optymalizacji jest ściśle powiązany z generowaniem harmonogramów produkcyjnych dla posiadanej bazy zleceń. Szczególną uwagę skupiono na analizie problemów wynikających z pominięcia roli człowieka w procesie przetwarzania zamówień, tworzenia harmonogramów oraz procesach decyzyjnych.

3

Invariant states for fluid models of EDF networks : nonlinear lifting map

Kruk Ł.

Probability and Mathematical Statistics

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2010

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Vol. 30, Fasc. 2

289--315

EN

We study fluid models of an open, subcritical multiclass queueing network with the earliest-deadline-first (EDF) service discipline and we provide a characterization of the corresponding invariant manifold. We show that the invariant states exhibit nonlinear state space collapse. Consequences of these findings for diffusion limits for EDF queueing networks are also discussed.

4

Stability of two families of real-time queueing networks

Kruk Ł.

Probability and Mathematical Statistics

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2008

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Vol. 28, Fasc. 2

179--202

EN

We study open multiclass queueing networks with renewal arrival streams and general service time distributions. Upon arrival to the network, customers from each class are assigned a random deadline drawn from a distribution associated with this class.We show that preemptive subcritical EDF networks with fixed customer routes are stable. We also prove that a broad class of (not necessarily subcritical) networks with reneging and Markovian routing, including EDF, FIFO, LIFO, SRPT, fixed priorities and processor sharing, is stable.

5

Problemy z terminologią : odchyłka regulacji, błąd regulacji czy też uchyb regulacji?

Jarema A.

Elektronika : konstrukcje, technologie, zastosowania

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2002

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Vol. 43, nr 2

29-29