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7 results on '"Ciorbă, Dumitru"'

1. INFORMATICS SECURITY ASSESSMENT IN THE REPUBLIC OF MOLDOVA

Author

BOLUN, Ion, CIORBĂ, Dumitru, ZGUREANU, Aureliu, BULAI, Rodica, CĂLIN, Rostislav, and BODOGA, Cristina

Subjects
enterprises/organizations/institutions, indicators, informatics security evaluation, informatics space, survey, Engineering (General). Civil engineering (General), TA1-2040, Electronic computers. Computer science, QA75.5-76.95
Abstract

The topicality of systemic research on informatics (IT) security in the Republic of Moldova is argued. Based on international practices, a set of 24 indicators (aspects) is defined for the incipient assessment of the state of informatics security in enterprises/organizations/institutions (EOIs). Through an online survey, the respective information is collected, EOIs being differentiated into 5 categories according to the number of employees, within each of which are distinguished ICT-EOIs and non-ICT-EOIs. The weighted average value of the percentage of EOIs (%EOI), of the percentage of ICT- EOIs (%ICT-EOIs) and of the percentage of non-ICT-EOIs (%non-ICT-EOIs) on 23 aspects of informatics security are: overall for EOIs - 71.7%, for ICT-EOIs - 73.3%, and for non-ICT-EOIs - 66.1%. The state of IT security of ICT-EOIs is better than that of non-ICT-EOIs. The biggest difference %ICT-EOIs – %non-ICT-EOIs is with reporting the IT security vulnerabilities of the implemented software, with performing the IT security audit of new IT applications/systems before implementation and with the implementing of an internal IT security policy. The dependence of the average value (on 23 aspects) of %EOIs on the number of employees is increasing. Moreover, the percentage of EOIs with 100% IT security performance for EOIs with over 500 employees is about twice as high (91.7%) as that for EOIs with up to 10 employees inclusive (43.8%).

Published
2020
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2. SARS-CoV-2 Wastewater Genomic Surveillance: Approaches, Challenges, and Opportunities

Author

Munteanu, Viorel, Saldana, Michael, Ciorba, Dumitru, Bostan, Viorel, Su, Justin Maine, Kasianchuk, Nadiia, Sharma, Nitesh Kumar, Knyazev, Sergey, Gordeev, Victor, Aßmann, Eva, Lobiuc, Andrei, Covasa, Mihai, Crandall, Keith A., Ouyang, Wenhao O., Wu, Nicholas C., Mason, Christopher, Tierney, Braden T, Lucaci, Alexander G, Zelikovsky, Alex, Mohebbi, Fatemeh, Skums, Pavel, Gibas, Cynthia, Schlueter, Jessica, Rzymski, Piotr, Solo-Gabriele, Helena, Hölzer, Martin, Smith, Adam, and Mangul, Serghei

Subjects
Quantitative Biology - Genomics
Abstract

During the SARS-CoV-2 pandemic, wastewater-based genomic surveillance (WWGS) emerged as an efficient viral surveillance tool that takes into account asymptomatic cases and can identify known and novel mutations and offers the opportunity to assign known virus lineages based on the detected mutations profiles. WWGS can also hint towards novel or cryptic lineages, but it is difficult to clearly identify and define novel lineages from wastewater (WW) alone. While WWGS has significant advantages in monitoring SARS-CoV-2 viral spread, technical challenges remain, including poor sequencing coverage and quality due to viral RNA degradation. As a result, the viral RNAs in wastewater have low concentrations and are often fragmented, making sequencing difficult. WWGS analysis requires advanced computational tools that are yet to be developed and benchmarked. The existing bioinformatics tools used to analyze wastewater sequencing data are often based on previously developed methods for quantifying the expression of transcripts or viral diversity. Those methods were not developed for wastewater sequencing data specifically, and are not optimized to address unique challenges associated with wastewater. While specialized tools for analysis of wastewater sequencing data have also been developed recently, it remains to be seen how they will perform given the ongoing evolution of SARS-CoV-2 and the decline in testing and patient-based genomic surveillance. Here, we discuss opportunities and challenges associated with WWGS, including sample preparation, sequencing technology, and bioinformatics methods., Comment: V Munteanu and M Saldana contributed equally to this work. M H\"olzer, A Smith and S Mangul jointly supervised this work. For correspondence: serghei.mangul@gmail.com

Published
2023

3. Min(Max-PSD) and Max(Min-PSD) as lifetime distributions in Network’s Reliability

Author

Leahu Alexei, Andrievschi-Bagrin Veronica, Ciorbă Dumitru, and Fiodorov Ion

Subjects
lifetime distributions, psd distributions, survival function / reliability, serial-parallel and parallel-serial networks, primary 60e05, secondary 60n05, 90b25, Mathematics, QA1-939
Abstract

In our paper we describe the corresponding dynamic mathematical models to perform a comparative analysis of the reliability of two types of networks: serial-parallel and parallel-serial when the number of subnetworks is constant and the numbers of units in each sub-network are Power Series Distributed (PSD) random variables (r.v.), but also when the lifetimes are independent, identically distributed r.v. We shows that the lifetime distributions of such kind of networks leads us to two new families of distributions called Min(Max-PSD) and Max(Min-PSD) distributions. The formulas for calculating the reliability of the related networks it was deduced too. Su cient conditions have been formulated for the serial-parallel network to always be more reliable than the parallel-serial network. Some graphically illustrated examples have been provided.

Published
2022
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6. Methodology and algorithm of information security risk management for local infrastructure

Author

Ciorbă Dumitru, Bulai Rodica, Rostislav Călin, and Poştaru Andrei

Subjects
Risk analysis (engineering), Computer science, General Medicine, Information security risk management
Abstract

The complexity of information security does not resume to mere technicality, transferring significant liability to proper management. Risk analysis in information security is a powerful tool that comes in handy for managers in making decisions about the implementation of efficient information management systems, in order to achieve the organization's mission. As a part of risk management, risk analysis is the systematic implementation of methods, techniques and management practices to assess the context, identify, analyze, evaluate, treat, monitor and communicate the risks for the information security and systems through which they are processed, stored or transmitted. The ISO/IEC 27005:2011 – Information security risk management, does not specify any particular method for managing the risks associated with information security, but a general approach. It is up to the organization to devise control objectives that would reflect specific approaches to risk management and the degree of assurance required. There are several models, methodologies and tools amongst which those like CRAMM (United Kingdom, Insight Consulting), Risicare/Mehari (France, Clusif), GSTool (Germany, ITGrundschutz). The theoretical model of the mentioned methodologies is hard to put in practice without experience required from the members of the risk analysis team. Using the appropriate risk assessment solution, an organization can devise its own security requirements.

Published
2018

7. Architecting software concurrency.

Author

Ciorbă, Dumitru and Beşliu, Victor

Subjects
*COMPUTER software development, *SOFTWARE architecture, *SYSTEMS design, *COMPUTER multitasking, *COMPUTER science
Abstract

Nowadays, the majority of software systems are inherently concurrent. Anyway, internal and external concurrent activities increase the complexity of systems' behavior. Adequate architecting can significantly decrease implementation errors. This work is motivated by the desire to understand how concurrency can constrain or influence software architecting. As a result, in the paper a methodological architecting framework applied for systems with "concurrency-intensive architecture" is described. This special term is defined to emphasize architectures, in which concurrent interactions are crucial. Also in the paper potential models for each phase of architecting framework are indicated. [ABSTRACT FROM AUTHOR]

Published
2011

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