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  1. Article ; Online: Performance Comparison of NB-Fi, Sigfox, and LoRaWAN.

    Levchenko, Polina / Bankov, Dmitry / Khorov, Evgeny / Lyakhov, Andrey

    Sensors (Basel, Switzerland)

    2022  Volume 22, Issue 24

    Abstract: LPWANs are a promising solution for wireless sensor networks. To compete with such widespread technologies as LoRaWAN and Sigfox, recently a new LPWAN technology called NB-Fi has been developed. In a short time, many NB-Fi networks have been deployed in ... ...

    Abstract LPWANs are a promising solution for wireless sensor networks. To compete with such widespread technologies as LoRaWAN and Sigfox, recently a new LPWAN technology called NB-Fi has been developed. In a short time, many NB-Fi networks have been deployed in various countries. Although NB-Fi, Sigfox, and LoRaWAN have been designed for similar applications, they implement different approaches. However, no detailed comparisons of them are present in academic literature. This paper aims to fill this gap by analyzing and comparing NB-Fi, Sigfox, and LoRaWAN focusing on performance evaluation results rather than just nominal parameters declared by the developers. Specifically, the paper evaluates the packet loss rate, packet error rate, and average delay in these networks in different scenarios. The results are used to provide guidelines to decide which technology to use under which conditions. Specifically, Sigfox performs best in scenarios when devices transmit small pieces of data without repetitions and acknowledgments, and LoRaWAN is the most reliable for transmitting bigger pieces of data, while NB-Fi is best suited for acknowledged transmissions of small pieces of data.
    Language English
    Publishing date 2022-12-08
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2052857-7
    ISSN 1424-8220 ; 1424-8220
    ISSN (online) 1424-8220
    ISSN 1424-8220
    DOI 10.3390/s22249633
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Book ; Online: On the Limits and Best Practice for NB-Fi

    Bankov, Dmitry / Levchenko, Polina / Lyakhov, Andrey / Khorov, Evgeny

    A New LPWAN Technology

    2023  

    Abstract: NB-Fi is a new low-power wide-area network technology, which has become widely used for smart cities, smart grids, the Industrial Internet of Things, and telemetry applications. Although many countries use NB-Fi, almost no papers study NB-Fi, and its ... ...

    Abstract NB-Fi is a new low-power wide-area network technology, which has become widely used for smart cities, smart grids, the Industrial Internet of Things, and telemetry applications. Although many countries use NB-Fi, almost no papers study NB-Fi, and its peak performance is unknown. This article aims to fill this gap by analyzing this technology and studying the problem of rate assignment in NB-Fi networks. For that, this article develops a mathematical model used to find the packet loss ratio, packet error rate, and the average delay for various rate assignment approaches. The performance evaluation results are used to develop the guidelines for NB-Fi configuration to optimize the network performance.
    Keywords Computer Science - Networking and Internet Architecture
    Publishing date 2023-09-22
    Publishing country us
    Document type Book ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  3. Article ; Online: Patterns of Intimate Partner Violence Victimization and Survivors' Help-Seeking.

    Cho, Hyunkag / Shamrova, Dasha / Han, Jae-Bum / Levchenko, Polina

    Journal of interpersonal violence

    2017  Volume 35, Issue 21-22, Page(s) 4558–4582

    Abstract: Intimate partner violence (IPV) survivors often do not seek critically needed help. A good understanding of the relationship between the pattern of violence and help-seeking is critical to developing adequate services for the survivors, as well as for ... ...

    Abstract Intimate partner violence (IPV) survivors often do not seek critically needed help. A good understanding of the relationship between the pattern of violence and help-seeking is critical to developing adequate services for the survivors, as well as for reaching out to those who do not seek help. This study used the National Intimate Partner and Sexual Violence Survey to examine how IPV survivor's help-seeking varies, depending on the characteristics of the survivors and the pattern of victimization. Logistic regression analyses were conducted, with the survivors' help-seeking and use of formal or informal help as the dependent variables. The study results show that women are the primary victims of IPV, that the pattern of victimization is associated with both whether survivors seek help or not, and which help sources they utilize, if any. IPV consequences are also associated with survivors' help-seeking, as are demographic factors such as age, gender, race, and immigration status.
    MeSH term(s) Adult ; Crime Victims/psychology ; Female ; Help-Seeking Behavior ; Humans ; Intimate Partner Violence/psychology ; Male ; Sexual Partners/psychology ; Surveys and Questionnaires ; Survivors/psychology
    Language English
    Publishing date 2017-06-23
    Publishing country United States
    Document type Journal Article
    ZDB-ID 2028900-5
    ISSN 1552-6518 ; 0886-2605
    ISSN (online) 1552-6518
    ISSN 0886-2605
    DOI 10.1177/0886260517715027
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article: [Our experience with the application of the speleotherapeutic treatment based at the state healthcare facility "Republican Speleotherapeutic Hospital"].

    Levchenko, P A / Dubovik, N N / Delendik, R I

    Voprosy kurortologii, fizioterapii, i lechebnoi fizicheskoi kultury

    2014  , Issue 6, Page(s) 26–29

    Abstract: The non-medicamental therapeutic modalities find an increasingly wider application for the rehabilitation and maintenance of the health status in man. Speleotherapy is one of such methods. The Republican Speleotherapeutic Hospital of Belarus exploits the ...

    Abstract The non-medicamental therapeutic modalities find an increasingly wider application for the rehabilitation and maintenance of the health status in man. Speleotherapy is one of such methods. The Republican Speleotherapeutic Hospital of Belarus exploits the underground speleocomplex in which over 42,000 petients with respiratory diseases and allergic pathologies were given the required treatment. The clinical effectiveness of speleotherapy is estimated at 97.3%. Remission persists for 7.0±0.4 months on the average within one year after a course of speleotherapy. Repeated courses are followed by even longer periods of remission (up to 2.5-3 years). It is concluded that speleotherapy is the highly efficient method for the rehabilitation of the patients presenting with respiratory diseases and allergic pathologies.
    MeSH term(s) Adolescent ; Adult ; Asthma/rehabilitation ; Bronchitis, Chronic/rehabilitation ; Child ; Female ; Hospitals, Special/methods ; Hospitals, Special/organization & administration ; Hospitals, Special/trends ; Humans ; Male ; Microclimate ; Pulmonary Disease, Chronic Obstructive/rehabilitation ; Republic of Belarus ; Rhinitis, Allergic, Seasonal/rehabilitation ; Speleotherapy/methods ; Speleotherapy/standards ; Speleotherapy/trends ; Young Adult
    Language Russian
    Publishing date 2014-11
    Publishing country Russia (Federation)
    Document type English Abstract ; Journal Article
    ZDB-ID 600726-0
    ISSN 2309-1355 ; 0042-8787
    ISSN (online) 2309-1355
    ISSN 0042-8787
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    In stock of ZB MED Cologne/Königswinter

    Zs.B 974: Show issues Location:
    Je nach Verfügbarkeit (siehe Angabe bei Bestand)
    bis Jg. 2021: Bestellungen von Artikeln über das Online-Bestellformular
    ab Jg. 2022: Lesesaal (EG)

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  5. Article: Vziatye sotsialisticheskie obiazatel'stva--vypolnim.

    Levchenko, P P

    Voenno-meditsinskii zhurnal

    1986  , Issue 4, Page(s) 9–11

    Title translation We shall discharge the socialist obligations taken.
    MeSH term(s) Communism ; Hospitals, Military/manpower ; Hospitals, Public/manpower ; Humans ; Medical Staff, Hospital ; Quality of Health Care/trends ; Ukraine
    Language Russian
    Publishing date 1986-04
    Publishing country Russia (Federation)
    Document type Journal Article
    ZDB-ID 392041-0
    ISSN 0026-9050 ; 0300-9114
    ISSN 0026-9050 ; 0300-9114
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    In stock of ZB MED Cologne/Königswinter

    Zs.B 1172: Show issues Location:
    Je nach Verfügbarkeit (siehe Angabe bei Bestand)
    bis Jg. 2021: Bestellungen von Artikeln über das Online-Bestellformular
    ab Jg. 2022: Lesesaal (EG)

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  6. Article: Veterinary-sanitary measures on large rabbit farms infected by Trichophyton disease

    Levchenko, P.I

    Biulleten' Vsesoiuznogo instituta eksperimental'noi veterinarii. 1984. (54)

    1984  

    Keywords veterinary medicine ; rabbits ; Trichophyton
    Language Russian
    Size p. 37-40.
    Document type Article
    Note In Russian. ; Title in original language could not be transcribed.
    ISSN 0366-4899
    Database NAL-Catalogue (AGRICOLA)

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  7. Article: Synthesis and structure of new 6-substituted 5-methyl-5,6-dihydrocyclohepta[b]indole-9,10-dicarboxylic anhydrides

    Levchenko, P. V / Shepelenko, E. N / Kuz'mina, L. G / Makarova, N. I / Metelitsa, A. V / Rybalkin, V. P / Bren', V. A / Minkin, V. I

    Russian journal of organic chemistry. 2009 Sept., v. 45, no. 9

    2009  

    Abstract: Reactions of (2-chloro-1-methyl-1H-indol-3-yl)-2-oxoacetyl chloride with alk-3-enoic acids gave the corresponding 6-substituted 5-methyl-5,6-dihydrocyclohepta[b]indole-9,10-dicarboxylic anhydrides which showed fluorescent properties. ...

    Abstract Reactions of (2-chloro-1-methyl-1H-indol-3-yl)-2-oxoacetyl chloride with alk-3-enoic acids gave the corresponding 6-substituted 5-methyl-5,6-dihydrocyclohepta[b]indole-9,10-dicarboxylic anhydrides which showed fluorescent properties.
    Language English
    Dates of publication 2009-09
    Size p. 1382-1385.
    Publisher SP MAIK Nauka/Interperiodica
    Publishing place Dordrecht
    Document type Article
    ZDB-ID 2065669-5
    ISSN 1608-3393 ; 1070-4280
    ISSN (online) 1608-3393
    ISSN 1070-4280
    DOI 10.1134/S1070428009090115
    Database NAL-Catalogue (AGRICOLA)

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  8. Article: Resistance of rabbit trichophytosis pathogens to the action of some chemical substances

    Levchenko, P.I

    Biulleten' Vsesoiuznogo instituta eksperimental'noi veterinarii. 1981. (42)

    1981  

    Title variant Resistance of rabbit trichophytosis pathogens to the action of some chemical substances [Trichophyton mentagrophytes]
    Keywords Trichophyton mentagrophytes
    Language Russian
    Size p. 39-41.
    Document type Article
    Note In Russian. ; Title in original language could not be transcribed.
    ISSN 0366-4899
    Database NAL-Catalogue (AGRICOLA)

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  9. Article: Survival of the rabbit trichophytosis pathogen in industrial farm conditions

    Levchenko, P.I

    Biulleten' Vsesoiuznogo instituta eksperimental'noi veterinarii. 1978. (32)

    1978  

    Keywords mycoses ; animal health ; animal diseases
    Language Russian
    Size p. 34-35.
    Document type Article
    Note In Russian; Summary in English. ; Title in original language could not be transcribed.
    ISSN 0366-4899
    Database NAL-Catalogue (AGRICOLA)

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  10. Article: Sources and factors in the transmission of infection in a closed housing system in rabbits with trichophytosis

    Levchenko, P.I

    Biulleten' Vsesoiuznogo instituta eksperimental'noi veterinarii. 1978. (32)

    1978  

    Keywords mycoses ; animal health ; animal diseases
    Language Russian
    Size p. 31-33., ill.
    Document type Article
    Note In Russian; Summary in English. ; Title in original language could not be transcribed.
    ISSN 0366-4899
    Database NAL-Catalogue (AGRICOLA)

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