Wyniki wyszukiwania - BazTech

1

Thespis: Causally-consistent OLTP

Camilleri Carl, Vella Joseph G., Nezval Vitezslav

Annals of Computer Science and Information Systems

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2021

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Vol. 25

261--269

EN

Data Consistency defines the validity of a data set according to some set of rules, and different levels of data consistency have been proposed. Causal consistency is the strongest type of consistency possible when data is stored in multiple locations, and fault tolerance is desired. Thespis is a middleware that leverages the Actor model to implement causal consistency over a DBMS, whilst abstracting complexities for application developers behind a REST interface. ThespisTRX is an extension that provides read-only transaction capabilities, whilst ThespisDIIP is another extension that handles distributed integrity invariant preservation. Here, we analyse standard transactional workloads on the relational data model, which is richer than the key-value data model supported by the Thespis interface. We show the applicability of the Thespis approach for this data model by designing new operations for the Thespis interface, which ensure correct execution of such workloads in a convergent, causally consistent distributed environment.

2

IoT sensing networks for gait velocity measurement

Chou Jyun-Jhe, Shih Chi-Sheng, Wang Wei-Dean, Huang Kuo-Chin

International Journal of Applied Mathematics and Computer Science

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2019

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Vol. 29, no. 2

245--259

EN

Gait velocity has been considered the sixth vital sign. It can be used not only to estimate the survival rate of the elderly, but also to predict the tendency of falling. Unfortunately, gait velocity is usually measured on a specially designed walk path, which has to be done at clinics or health institutes. Wearable tracking services using an accelerometer or an inertial measurement unit can measure the velocity for a certain time interval, but not all the time, due to the lack of a sustainable energy source. To tackle the shortcomings of wearable sensors, this work develops a framework to measure gait velocity using distributed tracking services deployed indoors. Two major challenges are tackled in this paper. The first is to minimize the sensing errors caused by thermal noise and overlapping sensing regions. The second is to minimize the data volume to be stored or transmitted. Given numerous errors caused by remote sensing, the framework takes into account the temporal and spatial relationship among tracking services to calibrate the services systematically. Consequently, gait velocity can be measured without wearable sensors and with higher accuracy. The developed method is built on top of WuKong, which is an intelligent IoT middleware, to enable location and temporal-aware data collection. In this work, we present an iterative method to reduce the data volume collected by thermal sensors. The evaluation results show that the file size is up to 25% of that of the JPEG format when the RMSE is limited to 0.5º.

3

A design and experiment of automation management system for platform as a service

Tashkandi Alalaa

Annals of Computer Science and Information Systems

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2019

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Vol. 18

711--715

EN

Security [11] and quality [4] of cloud computing services represent significant factors that affect the adoption by consumers. Platform as a Service (PaaS) is one of cloud computing service models [14]. Management of database systems, middleware and application runtime environments is automated in PaaS [2]. PaaS automation management issues and requirements were collected in three rounds from information technology experts using Delphi technique. In this paper, PaaS automation quality and security management system is proposed and evaluated. Evaluation of the management system was based on experiment in a private cloud for an organization undergoing a transformation toward PaaS computing.

4

Data Exchange Platform Dedicated to Distributed Control Systems

Strzelczyk P., Tomczewski K.

Pomiary Automatyka Robotyka

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2017

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R. 21, nr 3

53--62

EN

The paper presents the concept of generic exchange data platform dedicated to distributed control systems. The platform can be used to control industrial facilities, to synchronize the work of industrial and mobile robots. The solution can also be applied to active prostheses. The article presents an example of information exchange subsystem structure as well as data flow between platform applications.

PL

Artykuł przedstawia koncepcje generycznej platformy wymiany danych dedykowanej dla rozproszonych systemów sterowania. Platforma może zostać wykorzystana do sterowania obiektami przemysłowymi a także do synchronizacji pracy przemysłowych oraz mobilnych robotów. Rozwiązanie może być również zastosowane w aktywnych protezach. Artykuł prezentuje strukturę podsystemu wymiany danych oraz opisuje przepływ informacji pomiędzy aplikacjami bazującymi na oprogramowaniu platformy.