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1

On rapid development of reactive wireless sensor systems

Gburzyński Paweł, Kopciuszewska Elżbieta

System Safety : Human - Technical Facility - Environment

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2019

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Vol. 1, nr 1

574--582

EN

We present a software platform for designing and testing wireless networks of sensors and actuators (WSNs). The platform consists of three components: an operating system for small-footprint microcontrollers (dubbed PicOS), a software development kit (SDK) amounting to a C-based, event-oriented (reactive) programming language, and a virtual execution platform (VUE2 ) capable of emulating complete deployment environments for WSNs and thus facilitating their rapid development.1 Its most recent incarnation introduced in the present paper is a component of the WSN lab being currently set up at Vistula in collaboration with Olsonet Communications Corporation. 2 We highlight the platform’s most interesting features within the context of a production WSN installed at independent-living facilities.

2

Active - Passive: On Preconceptions of Testing

Brzeziński K. M.

Journal of Telecommunications and Information Technology

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2011

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nr 3

63-73

EN

In telecommunications and software engineering, testing is normally understood to be essentially active: a tester is said to stimulate, control, and enforce. Passive testing does not fit this paradigm and thus remains the niche research subject, which bears on the scope and depth of the obtained results. It is argued that such limited understanding of testing is one of its many community-bound preconceptions. It may be acceptable in the current engineering approach to testing, but can and should be challenged in order to converge on the core concepts of the proposed science of testing ("testology"). This methodological work aims at establishing that there are no fundamental reasons for admitting the dominant role of the active element in testing. To show this, external (also extratechnical) areas are consulted for insight, direct observations, and metaphors. The troublesome distinction between (passive) testing and monitoring, as well as unclear relations between testing and measurements, are also addressed.

3

Konstrukcja reaktywnych rozproszonych systemów obsługi zdarzeń bazujących na magistrali CAN na przykładzie nadrzędnego systemu kontrolno-diagnostycznego

Werewka J.

Szybkobieżne Pojazdy Gąsienicowe

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2008

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nr 1 (23)

31--42

PL

W opracowaniu przedstawiono propozycję rozwiązania dla systemów reaktywnych potraktowanych jako systemy zdarzeń. Systemy reaktywne stanowią szeroką klasę systemów, które związane są z pewnym środowiskiem w ten sposób, że muszą cały czas reagować na zmiany w nim zachodzące. Ponieważ zwykle systemy zdarzeń rozlokowane są na pewnym obszarze, to przedstawione rozwiązania będą związane z tworzeniem architektur systemów rozproszonych. W opracowaniu przedstawiono metodę konstrukcji nadrzędnego systemu kontrolno-diagnostycznego. Przedyskutowano zagadnienia związane ze spełnieniem ograniczeń czasu rzeczywistego. Opisano możliwości wykorzystania różnych mechanizmów komunikacyjnych sieci CAN przydatnych przy budowie systemów czasu rzeczywistego. Przedstawiono przykładową implementację takiego systemu kontrolno-diagnostycznego (NSKD) bazującego na magistrali CAN przeznaczonego dla nadzoru poprawności działania systemu sterującego akceleratorem.

EN

In the paper a solution proposal of reactive systems treated as the systems of events was introduced. Reactive systems are a wide class of the systems connected with certain environment to react all the time on changes in the environment. Because the systems of events are spread usually over certain area, so the introduced solutions concerns creating architectures for distributed computer systems. In the paper a method of the construction of Supervisory Control and Diagnostic systems (NSKD) basing on CAN bus was introduced. The fulfilment of the limitations of the real time constraints was discussed. The possibilities of utilization of various CAN bus communication mechanisms useful in construction of real time distributed systems were described. An implementation example was introduced of a Supervisory Control and Diagnostic system (NSKD) basing on CAN bus, designed for the supervision of the correctness of the working of the system steering the accelerator.

4

On a practical approach to low-cost ad hoc wireless networking

Gburzyński P., Olesiński W.

Journal of Telecommunications and Information Technology

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2008

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nr 1

29-42

EN

Although simple wireless communication involving nodes built of microcontrollers and radio devices from the low end of the price spectrum is quite popular these days, one seldom hears about serious wireless networks built from such devices. Most of the commercially available nodes for ad hoc networking (somewhat inappropriately called "motes") are in fact quite serious computers with megabytes of RAM and rather extravagant resource demands. We show how one can build practical ad hoc networks using the smallest and cheapest devices vailable today. In our networks, such devices are capable of sustaining swarm-intelligent sophisticated routing while offering enough processing power to cater to complex applications involving distributed sensing and monitoring.

5

On the chemical potential/electronegativity equalization in density functional theory

Nalewajski R.F.

Polish Journal of Chemistry

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1998

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Vol. 72, nr 7S

1763-1778

EN

General variational principles of the Kohn-Sham (KS) density functional theory are interpreted as the corresponding chemical potential/electronegativity equalization equations. The unconstrained (ground-state) and constrained (excited) electron configuratons are examined for both the system global description and for the case of its partitioning into mutually closed subsystems, e.g., reactants. The chemical potential discontinuity for the integer numbers of electrons at zero temperature is stressed, and the KS orbital description of he charge transfer (CT) between reactants is discussed. Using the appropriate ensemble formulation of the KS theory thein situ chemical potential/electronegativity difference, the driving 'force' behind the inter-reactant CT, is linked to the relevant KS frontier eigenvalues of polarized reactants.