• Title/Summary/Keyword: consensus

Search Result 2,304, Processing Time 0.032 seconds

Consensus-based Cooperative Control for multiple leaders and single follower with interaction nonlinearities (상호작용 비선형성이 있는 다중 리더와 단일 추종자를 위한 일치 기반의 협력 제어)

  • Tack, Han-Ho;Lim, Young-Hun
    • Journal of the Korea Institute of Information and Communication Engineering
    • /
    • v.25 no.11
    • /
    • pp.1663-1669
    • /
    • 2021
  • This paper considers the cooperative control problem for multiple leaders and a single follower with interactions. The leaders are controllable, and the follower has interactions with all leaders and is controlled by the interactions. Then, we study the cooperative control problem that achieves the consensus by controlling the leaders. The leaders and the follower are modeled by the single-integrator and the double-integrator, respectively, and it is assumed that the interactions have the nonlinearities. The leaders can estimate the interaction between the follower and exchange the estimated information with neighbors. Then, this paper proposes the consensus-based cooperative control algorithm using the information exchange of the estimated interactions and the virtual velocity variables to achieve the velocity consensus. We analyze the convergence of the agents to the common state based on the Lasalle's Invaraince Principle. Finally, we provide the numerical example to validate the theoretical results.

Evaluation and Comparative Analysis of Scalability and Fault Tolerance for Practical Byzantine Fault Tolerant based Blockchain (프랙티컬 비잔틴 장애 허용 기반 블록체인의 확장성과 내결함성 평가 및 비교분석)

  • Lee, Eun-Young;Kim, Nam-Ryeong;Han, Chae-Rim;Lee, Il-Gu
    • Journal of the Korea Institute of Information and Communication Engineering
    • /
    • v.26 no.2
    • /
    • pp.271-277
    • /
    • 2022
  • PBFT (Practical Byzantine Fault Tolerant) is a consensus algorithm that can achieve consensus by resolving unintentional and intentional faults in a distributed network environment and can guarantee high performance and absolute finality. However, as the size of the network increases, the network load also increases due to message broadcasting that repeatedly occurs during the consensus process. Due to the characteristics of the PBFT algorithm, it is suitable for small/private blockchain, but there is a limit to its application to large/public blockchain. Because PBFT affects the performance of blockchain networks, the industry should test whether PBFT is suitable for products and services, and academia needs a unified evaluation metric and technology for PBFT performance improvement research. In this paper, quantitative evaluation metrics and evaluation frameworks that can evaluate PBFT family consensus algorithms are studied. In addition, the throughput, latency, and fault tolerance of PBFT are evaluated using the proposed PBFT evaluation framework.

Harmony through Holistic Engagement: An Emic Model of Greater East Asian Regionalism

  • von Feigenblatt, Otto F.
    • Journal of Contemporary Eastern Asia
    • /
    • v.12 no.2
    • /
    • pp.61-87
    • /
    • 2013
  • This study applies grounded theory to develop an emic substantive theory of regional integration in Greater East Asia. The role of norms and policies is explored through discursive content analysis of a wide theoretical sample of official elite policy statements dealing with regionalism and related policy areas. A resulting model of regional integration titled "Harmony through Holistic Engagement" is then discussed in relation to the etic consensus on the phenomenon. The study concludes that the etic consensus on the nature of regional integration in Greater East Asia greatly differs from the results of an emic approach and thus reflects a normative consensus rather than a descriptive reality.

Consensus-Based Formation Tracking of Fuzzy Multi-Agent Systems (이산시간 퍼지 다개체 시스템의 상태일치 기반 대형 추종 제어기)

  • Moon, Ji Hyun;Jee, Sung Chul;Lee, Ho Jae
    • The Transactions of The Korean Institute of Electrical Engineers
    • /
    • v.63 no.8
    • /
    • pp.1080-1084
    • /
    • 2014
  • This paper addresses a design technique for formation tracking controllers of discrete-time Takagi-Sugeno fuzzy multi-agent systems based on consensus. The interconnection topology among the agents is expressed as a digraph. The design condition is represented in terms of linear matrix inequalities. Numerical example demonstrates the effectiveness of the proposed method.

Random Sample Consensus (RANSAC)-based Automatic (game of) Go Recording System (Random Sample Consensus(RANSAC) 기반 자동 바둑 기보 시스템)

  • Park, D.J.;Jun, Kyungkoo
    • Journal of Korea Multimedia Society
    • /
    • v.17 no.7
    • /
    • pp.829-837
    • /
    • 2014
  • This paper develops an automatic go recording system based on image processing. We use Random Sample Consensus to detect the circular shape of stone and propose a set of methods to improve the computational overhead of RANSAC. The proposed scheme is not affected by the changes of stone location, illumination, and camera distance, which is different from existing methods. We implemented the proposed scheme into a working system and confirmed that the recording is feasible and the problems have been improved.

A Study on the Conceptual Discussion of Healthy Families (건강가정 개념에 대한 논의)

  • Song Hye-Rim;Sung Mi-Ai;Chin Mee-Jung;Lee Seung-Mi
    • Journal of Families and Better Life
    • /
    • v.23 no.6 s.78
    • /
    • pp.179-190
    • /
    • 2005
  • This study discusses the conceptual meanings of 'healthy families' by examining four popular misunderstandings regarding the concept. These misunderstandings are based partly on the lack of consensus on the use of the concepts of 'health' and 'families' and partly on the intentional misreading of the 'Healthy Fanulies Act' To correspond to the Concerns related to the Act, we need to clarify various meanings of the concept of family and to confirm the theoretical pounds of 'healthy families' based on the multidisciplinary consensus. To build consensus, it might be necessary to review some of the articles of the Act that have been misinterpreted.

Consensus Control for Switched Multi-agent Systems with Interval Time-varying Delays (구간 시변 지연을 고려한 전환 멀티-에이전트 시스템에 대한 일치 제어)

  • Park, M.J.;Kwon, O.M.;Lee, S.M.;Park, Ju-H.;Cha, E.J.
    • Journal of Institute of Control, Robotics and Systems
    • /
    • v.18 no.5
    • /
    • pp.401-406
    • /
    • 2012
  • This paper considers multi-agent systems with interval time-varying delays and switching interconnection topology. By construction of a suitable Lyapunov-Krasovskii's functional, new delay-dependent consensus control conditions for the systems are established in terms of LMIs (Linear Matrix Inequalities) which can be easily solved by various effective optimization algorithms. One numerical example is given to illustrate the effectiveness of the proposed methods.

An Analysis of Small-group Children′s Consensus Patterns in Open-ended Problem Solving (개방형 문제 해결 과정에서 나타난 소집단 구성원의 합의 패턴 분석)

  • 박우자;전평국
    • Education of Primary School Mathematics
    • /
    • v.7 no.2
    • /
    • pp.117-129
    • /
    • 2003
  • The purpose of this study is to analyze the interaction patterns and the commonly accepted norms of reaching a consensus among small-group children when solving open-ended problems. In conclusion, open-ended problems have various strategies or different acceptable answers, so they give children learning opportunities to compare the answers and to participate in communication. And more valuable interaction patterns come from 'measuring','classifying' problems and open-ended problems with implicit solution. Therefore, teachers might as well consider the relation between problems and interaction patterns when they pose open-ended problems in a small-group study setting. They are expected to empower children to have sociomathematical norms of reaching a consensus un der indirect and supportive guidance.

  • PDF

The Consensus on Impression Formation

  • Kim, In-Sook;Seok, Hye-Jung
    • The International Journal of Costume Culture
    • /
    • v.9 no.2
    • /
    • pp.104-112
    • /
    • 2006
  • The studies on impression formation usually have focused on the effect of certain appearance features which elevates perceptual evaluation. This study tried to find out whether there is a consensus on impression formation between the perceived person and the perceiver and if the gender is any significant variable to cast any difference on the impression evaluation. Seven photos of voluntary students in ppt file were projected to 143 students attending a university psychology class and were subjected to a impression evaluation questionnaire consisting of 28 adjective scales. The analysis of result revealed: 1) There was a significant difference between the impression evaluation scores of the perceivers and the perceived; the self evaluation of the perceived person was higher than the perceivers' evaluation. 2) There was also a significant evaluation score difference between the genders of the perceivers; the female perceivers rated the stimuli higher than the male perceivers. There was no interaction effect between the genders of the perceivers and the perceived.

  • PDF

Order Reduction Paradigm for Consensus of Neutrally Stable Multi-Agent Systems (중립적으로 안정한 다개체 시스템의 일치에 대한 제어기 차수 감소 패러다임)

  • Kim, Hong-Keun;Kim, Seong-Jun;Shim, Hyung-Bo;Back, Ju-Hoon
    • Journal of Institute of Control, Robotics and Systems
    • /
    • v.16 no.3
    • /
    • pp.222-226
    • /
    • 2010
  • In this paper we study the consensus problem of SISO (Single-Input Single-Output) linear multi-agent systems under a fixed weighted undirected network communication. The dynamics of each agent can be of any order, while it is constrained to be neutrally stable. Based on a simple root locus argument, we show that the problem at hand is always solvable if the gain and zeros of the dynamic compensator, of which dimension is the same as the number of plant poles on the imaginary axis, are chosen suitably, finally the result is successfully verified by an example.