scholarly journals Smart Contract-Based Pool Hopping Attack Prevention for Blockchain Networks

Symmetry ◽  
2019 ◽  
Vol 11 (7) ◽  
pp. 941 ◽  
Author(s):  
Sushil Kumar Singh ◽  
Mikail Mohammed Salim ◽  
Minjeong Cho ◽  
Jeonghun Cha ◽  
Yi Pan ◽  
...  
Keyword(s):  
Comparative Analysis ◽  
Computational Power ◽  
Critical Factors ◽  
Smart Contract ◽  
Prevention Model ◽  
History Of ◽  
Detection Strategies

Pool hopping attack is the result of miners leaving the pool when it offers fewer financial rewards and joining back when the rewards of mining yield higher rewards in blockchain networks. This act of leaving and rejoining the pool only during the good times results in the miner receiving more rewards than the computational power they contribute. Miners exiting the pool deprive it of its collective hash power, which leaves the pool unable to mine the block successfully. This results in its competitors mining the block before they can finish mining. Existing research shows pool hopping resistant measures and detection strategies; however, they do not offer any robust preventive solution to discourage miners from leaving the mining pool. To prevent pool hopping attacks, a smart contract-based pool hopping attack prevention model is proposed. The main objective of our research is maintaining the symmetrical relationship between the miners by requiring them all to continually contribute their computational power to successfully mine a block. We implement a ledger containing records of all miners, in the form of a miner certificate, which tracks the history of the miner’s earlier behavior. The certificate enables a pool manager to better initiate terms of the smart contract, which safeguards the interests of existing mining pool members. The model prevents frequent mine hoppers from pool hopping as they submit coins in the form of an escrow and risk losing them if they abandon the pool before completing mining of the block. The key critical factors that every pool hopping attack prevention solution must address and a study of comparative analysis with existing solutions are presented in the paper.

Apocrypha from the History of the Jewish Military Union and its Authors

2008 ◽  
pp. 147-176
Author(s):  
Dariusz Libionka
Keyword(s):  
Comparative Analysis ◽  
Critical Analysis ◽  
Communist Regime ◽  
Research Approach ◽  
Warsaw Ghetto ◽  
History Of

This article is an attempt at a critical analysis of the history of the Jewish Fighting Union (JFU) and a presentation of their authors based on documents kept in the archives of the Institute of National Remembrance in Warsaw. The author believes that an uncritical approach and such a treatment of these materials, which were generated under the communist regime and used for political purposes resulted in a perverted and lasting picture of the history of this fighting organisation of Zionists-revisionists both in Poland and Israel. The author has focused on a deconsturction of the most important and best known “testimonies regarding the Warsaw Ghetto Uprising”, the development and JFU participation in this struggle, given by Henryk Iwaƒski, WΠadysΠaw Zajdler, Tadeusz Bednarczyk and Janusz Ketling–Szemley.A comparative analysis of these materials, supplemented by important details of their war-time and postwar biographies, leaves no doubt as to the fact that they should not be analysed in terms of their historical credibility and leads one to conclude that a profound revision of research approach to JFU history is necessary.

THE TIMURID PERIOD FROM THE HISTORY OF THE FINE ARTS

2019 ◽  
Vol 19 (2) ◽  
pp. 28-33
Author(s):  
Ulug'bek Kuryazov ◽  
Keyword(s):  
Comparative Analysis ◽  
Fine Arts ◽  
The World ◽  
History Of

The article examines the works of scholars in the study of the history of fine arts, in particular miniatures of the Amir Temur era and temurids. Special attention is paid to the history of the creativity of Mirak Nakkosh and the outstanding miniaturist Kamoliddin Behzod. A comparative analysis of several miniature works is given. As well as analyzed some miniatures stored in the collections of museums and libraries of the world

Russian Museum of Emperor Alexander III as a place of memory

2020 ◽  
Vol 2020 (11-1) ◽  
pp. 132-147
Author(s):  
Dmitry Rakovsky
Keyword(s):  
Comparative Analysis ◽  
Historical Consciousness ◽  
Russian Society ◽  
Museum Collection ◽  
Works Of Art ◽  
History Of ◽  
The Creation ◽  
Historical Representations

The main purpose of this article is to study the role of the Russian Museum in the formation of the historical consciousness of Russian society. In this context, the author examines the history of the creation of the Russian Museum of Emperor Alexander III and its pre-revolutionary collections that became the basis of this famous museum collection (in particular, the composition of the museum’s expositions for 1898 and 1915). Within the framework of the methodology proposed by the author, the works of art presented in the museum’s halls were selected and distributed according to the historical eras that they reflect, and a comparative analysis of changes in the composition of the expositions was also carried out. This approach made it possible to identify the most frequently encountered historical heroes, to consider the representation of their images in the museum’s expositions, and also to provide a systemic reconstruction of historical representations broadcast in its halls.

Historical Representations and Recent Changes

2018 ◽  
Author(s):  
Jürgen Schaflechner
Keyword(s):  
Comparative Analysis ◽  
South Asia ◽  
Oral Histories ◽  
Detailed History ◽  
Modern Times ◽  
History Of ◽  
Historical Representations ◽  
The Rich ◽  
Many Sources ◽  
Over Time

Chapter 3 introduces the tradition of ritual journeys and sacred geographies in South Asia, then hones in on a detailed history of the grueling and elaborate pilgrimage attached to the shrine of Hinglaj. Before the construction of the Makran Coastal Highway the journey to the Goddess’s remote abode in the desert of Balochistan frequently presented a lethally dangerous undertaking for her devotees, the hardships of which have been described by many sources in Bengali, Gujarati, Hindi, Sindhi, and Urdu. This chapter draws heavily from original sources, including travelogues and novels, which are supplanted with local oral histories in order to weave a historical tapestry that displays the rich array of practices and beliefs surrounding the pilgrimage and how they have changed over time. The comparative analysis demonstrates how certain motifs, such as austerity (Skt. tapasyā), remain important themes within the whole Hinglaj genre even in modern times while others have been lost in the contemporary era.

scholarly journals Rationale and design of a type 2 diabetes prevention intervention for at-risk mothers and children at a Federally Qualified Healthcare Center: EPIC El Rio Families Study Protocol

2021 ◽  
Vol 21 (1) ◽  
Author(s):  
David G. Marrero ◽  
Robert M. Blew ◽  
Kelly N. B. Palmer ◽  
Kyla James ◽  
Denise J. Roe ◽  
...  
Keyword(s):  
Type 2 Diabetes ◽  
At Risk ◽  
Cardiovascular Health ◽  
Excess Body Weight ◽  
Lifestyle Behaviors ◽  
Increased Risk ◽  
Group Randomized Trial ◽  
Prevention Model ◽  
History Of

Abstract Background Exposure to gestational diabetes mellitus (GDM) is associated with increased risk for type 2 diabetes (T2DM) in mothers, and poor cardiovascular health among offspring. Identifying effective methods to mitigate T2DM risk has the potential to improve health outcomes for mothers with a history of GDM and their children. The goal of the EPIC El Rio Families Study is to implement and evaluate the effects of a 13-week behavioral lifestyle intervention on T2DM risk factors in at-risk mothers and their 8- to 12-year-old children. We describe herein the rationale for our specific approach, the adaption of the DPP-based curriculum for delivery to patients of a Federally Qualified Health Center (FQHC), and the study design and methodology. Methods The effects of the intervention on reduction in excess body weight (primary outcome), hemoglobin A1c, blood pressure, and changes in lifestyle behaviors associated with weight trajectory and T2DM risk in mother-child dyads will be evaluated during a 13-week, group randomized trial wherein 60 mothers and their children will be recruited to the intervention or wait-listed control conditions at one of two FQHC locations. Intervention participants (n = 30) will begin the group program immediately, whereas the wait-listed controls (n = 30) will receive a booklet describing self-guided strategies for behavior change. Associated program delivery costs, acceptability of the program to participants and FQHC staff, and potential for long-term sustainability will also be evaluated. Discussion Successful completion in our aims will produce a scalable program with high potential for replication and dissemination, and estimated intervention effects to inform T2DM prevention efforts on families who use the FQHC system. The results from this study will be critical in developing a T2DM prevention model that can be implemented and scaled across FQHCs serving populations disproportionately burdened by T2DM. Trial registration ClinicalTrials.gov NCT03781102; Date of registration: 19 December 2018.

The socio-economic and demographic characteristics of port cities: a typology for comparative analysis?

Urban History ◽  
1998 ◽  
Vol 25 (2) ◽  
pp. 147-172 ◽  
Author(s):  
Robert Lee
Keyword(s):  
Comparative Analysis ◽  
Urban Development ◽  
Case Studies ◽  
Comparative Research ◽  
Common Factors ◽  
Demographic Characteristics ◽  
Port Cities ◽  
Dominant Ideology ◽  
Merchant Capital ◽  
History Of

ABSTRACTThis article addresses a range of conceptual issues relating to the history of European port cities in order to construct a framework for comparative research. Port cities played a key role in European urban development and their growth was often determined by common factors. Particular attention is paid to the demography of port cities, their specific labour markets and the dominant ideology of merchant capital. The article establishes a basis for analysing case studies of individual port cities and for exploring their location within the overall process of European urbanization.

Poison Centers, Poison Prevention, and the Pediatrician

PEDIATRICS ◽  
1994 ◽  
Vol 94 (2) ◽  
pp. 220-224 ◽  
Author(s):  
Frederick H. Lovejoy ◽  
William O. Robertson ◽  
Alan D. Woolf
Keyword(s):  
The United States ◽  
Poison Control ◽  
Poison Center ◽  
Department Of Health ◽  
Household Products ◽  
Prevention Model ◽  
Poison Centers ◽  
History Of ◽  
Poison Prevention ◽  
Remarkable Progress

The first poison centers were established in the United States in the early 1950s, stimulated by an American Academy of Pediatrics' survey of office-based pediatric practices which ascertained that its members had no place to turn for ingredient information on medications and household products.1 With the help of the Academy, pediatrician Dr. Edward Press, the Illinois Department of Health, and several community hospitals, the first poison center emerged. Over the subsequent 40 years, remarkable progress has occurred in the fields of clinical toxicology, poison control, and poison prevention. Yet despite these accomplishments, challenging clouds are appearing on the horizon which threaten these gains. This commentary, by the authors who have viewed and participated in a large part of the history of this progress, will focus on these major accomplishments with an emphasis on (a) poison prevention utilizing the pre-event (primary prevention), (b) the event (secondary prevention), and (c) the postevent (tertiary prevention) model.2

Creative communication of artistic systems M. Tsvetaeva and B. Pasternak

2021 ◽  
Vol 6 (2) ◽  
pp. 74-82
Author(s):  
Anastasia Valerievna Sebeleva
Keyword(s):  
Comparative Analysis ◽  
Comparative Studies ◽  
Mutual Influence ◽  
Integrated Approach ◽  
Literary Studies ◽  
Textual Information ◽  
Priority Direction ◽  
Literary Process ◽  
History Of ◽  
Mutual Communication

This article proceeds from the fact that the problem of interaction and mutual influence is quite acute in literary studies. In this regard, the relevance of the research is due, firstly, to the correspondence to the priority direction of modern literary studies associated with the comparative analysis of the text, and secondly, to the need to disclose the deep theoretical and artistic content of creative communication of such artistic personalities of the XX century as M. Tsvetaeva and B. Pasternak, whose legacy still contains many lacunae. The methodological basis of the research is an integrated approach, including comparative-historical, historical-literary, comparative-typological, system-analytical and biographical methods, as well as the method of comparative studies, which allows to study literary analogies and connections of different national literatures, their refraction in the texts of the authors studied. Hermeneutics contributed to the mental comprehension of the analyzed texts, the mental processing of textual information. An important episode in the history of world poetry was the correspondence-dialogue of iconic poets for their time: M. Tsvetaeva and B. Pasternak. Correspondence is valuable not only because it shows us the life of poets in relation to time. The creative aspect of correspondence is very important. The rapprochement manifested in it and at the same time the repulsion was deeply creative and left deep traces in the legacy of all its participants. Poets, albeit to varying degrees, concentrated and passionately, sought to define for themselves the essence of life and poetry. In the course of the research, the author of the article comes to the conclusion that, firstly, the literary process is characterized by a systematic nature in which authors and their works are in certain relationships to each other. Secondly, the thirteen-year correspondence of M. Tsvetaeva with B. Pasternak was very significant for literature. Thanks to mutual communication, creative interaction, the poets created unique, emotionally deep works.

Sign in / Sign up

Export Citation Format

Share Document