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1

Multi-queue service for task scheduling based on data availability

Rybiński Kamil, Śmiałek Michał

Annals of Computer Science and Information Systems

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2023

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Vol. 35

699--709

EN

Large-scale computation (LSC) systems are often performed in distributed environments where message passing is the key to orchestrating computations. In this paper we present a new message queue concept developed within the context of an LSC system (BalticLSC). The concept consists in proposing a multi-queue, where queues are grouped into families. A queue family can be used to distribute messages of the same kind to multiple computation modules distributed between various nodes. Such message families can be synchronised to implement a mechanism for initiating computation jobs based on multiple data inputs. Moreover, the proposed multi-queue has built-in mechanisms for controlling message sequences in applications where complex data set splitting is necessary. The presented multi-queue concept was implemented and applied with success in a working LSC system.

2

The influence of selected factors on the strength of angle joints of frame elements

Rybiński Kamil, Borysiuk Piotr

Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology

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2022

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No. 118

5--14

EN

The influence of selected factors on the strength of angle joints of frame elements. The research determined the impact of 5 types of adhesives (PVAc, EVA, PO, PO met., PUR) and the time elapsed since the moment of gluing (4, 8, 12, 24 and 72h) on the strength of the mitre joints of frame elements made of MDF. The elements of the frames were additionally connected with metal staples. As a reference option, joining elements without an adhesive, using only staples, was employed. The strength of the connections was determined as the maximum module when testing connections in two configurations: compression and tensile strength. For each variant, 10 repetitions were performed. It was demonstrated that regardless of the test system or the time elapsed since gluing, the highest values of the modules were recorded in the case of the EVA adhesive. In turn, the use of PO and PUR adhesives requires a long bonding time, while PO met. and PVAc adhesives are characterized by low suitability for gluing mitre joints made of MDF sheets (values of modules comparable to the values of modules having only stapled connections).

PL

Wpływ wybranych czynników na wytrzymałość połączeń kątowych elementów ramek. W ramach badań określono wpływ 5 rodzajów klejów (PVAc, EVA, PO, PO met., PUR) oraz czasu, który upłynął od momentu klejenia (4, 8, 12, 24 i 72h) na wytrzymałość połączeń uciosowych elementów ramek wykonanych z płyty MDF. Elementy ramek łączone były dodatkowo zszywkami metalowymi. Jako wariant odniesienia zastosowano połączenie elementów bez kleju tylko przy użyciu zszywki. Wytrzymałość połączeń określono jako moduł maksymalny podczas badania połaczeń w dwóch układach: na ściskanie i rozciąganie. Dla każdego wariantu wykonano po 10 powtórzeń. Wykazano, że nieżaleznie od zastosowanego układu badania czy też czasu, który upłynął od momentu klejenia najwyższe wartości modułów odnotowano w przypadku kleju EVA. Z kolei wykorzystanie klejów PO i PUR wymaga zastosowania długiego czasu wiązania, zaś kleje PO met. i PVAc charakteryzują się niską przydatnością do klejenia połączeń uciosowych z płyt MDF (wartości modułów porównywalne do wartości modułów połączeń tylko na zszywki).

3

Beyond Low-Code Development: Marrying Requirements Models and Knowledge Representations

Rybiński Kamil, Smialek Michal

Annals of Computer Science and Information Systems

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2022

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Vol. 30

919--928

EN

Typical Low-Code Development platforms enable model-driven generation of web applications from high-level visual notations. They normally express the UI and the application logic, which allows generating the frontend and basic CRUD operations. However, more complex domain logic (data processing) operations still necessitate the use of traditional programming. This paper proposes a new visual language, called RSL-DL, to represent domain knowledge with complex domain rules aligned with requirements models. The language synthesises and extends approaches found in knowledge representation (ontologies) and software modelling language engineering. Its purpose is to enable a fully automatic generation of domain logic code by reasoning over and reusing domain knowledge. The language's abstract syntax is defined using a meta-model expressed in MOF. Its semantics is expressed with several translational rules that map RSL-DL models onto typical programming language constructs. The rules are explained informally in natural language and formalised using a graphical transformation notation. It is also supported by introducing an inference engine that enables processing queries to domain models and selecting appropriate invocations to generated code. The presented language was implemented by building a dedicated model editor and transformation engine. It was also initially validated through usability studies. Based on these results, we conclude that declarative knowledge representations can be successfully used to produce imperative back-end code with non-trivial logic.