• 대한한의진단학회지
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• 제18권3호
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• pp.137-148
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• 2014

Objectives This study was conducted to derive consensus about physical attributes in pressure pulse waveform and pulse conditions by Delphi study. Methods Delphi research was conducted for 2 rounds via e-mail. 8 Professors who lecture on a diagnostics of K. M. from the society of Korean medicine diagnostics were participated in this survey. They were asked for answering about series of definition for a physical attribute in pressure pulse waveform and combination for physical attributes of pulse conditions. Results 4 survey items were decided to have high validity and 9 survey items were decided to come to consensus about a physical attribute in pressure pulse waveform. 6 pulse condition were decided to come to consensus. Conclusion Using Delphi method, physical attributes in pressure pulse waveform and combinations of physical attribute in pulse condition come to consensus.

• 한국융합학회논문지
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• 제9권9호
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• pp.83-88
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• 2018

블록체인은 중앙 집중화된 시스템이 아닌 분산화 된 시스템을 구현하는 데에 사용되는 기술로써, 익명성, 투명성 등을 특징으로 한다. 그러나 아직 블록체인을 상용화하기에는 고질적인 공격들이 존재한다. 본 논문에서는 이러한 블록체인을 구현하기 위해서 존재하는 대표적인 합의 알고리즘으로써 Bitcoin, Algorand, 그리고 IOTA를 소개하고, 각각의 합의 알고리즘들이 어떠한 방법으로 블록체인의 고질적인 공격들인 이중 지불 공격이나 시빌 공격을 해결하는지, 혹은 해결하지 못하고 있다면 어떤 방법으로 해결할 수 있는지를 소개한다. 뿐만 아니라 기존의 고질적인 공격이 가능한 새로운 시나리오를 제안한다.

• 한국과학교육학회지
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• 제39권5호
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• pp.681-694
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• 2019

This study intends to delineate the characteristics of various perspectives on the nature of science (NOS) through the textbook analysis. Thus, centering on a science textbook called Science Laboratory Experiments, this study analyzes the elements of the NOS from three different perspectives: the consensus view, features of science (FOS), and family resemblance approach (FRA). While the consensus view highlights the similar elements of the NOS across the topics, the FOS is concerned about empirical ways for doing science. The FRA rather focuses on socio-cultural aspects of science activities. While the consensus view is useful to reify the features of the NOS, the FRA helps to understand science from various viewpoints. Regarding the philosophical account for three perspectives, all of them are ambiguous to some extent. The consensus view holds contradictory dispositions e.g., relativism vs. (post-)positivism, and critical realism and instrumentalism. The FOS supports empirical tradition but cannot effectively cope with the anomalous situation. The FRA is useful to show up the ways of science in both microscopic (personal) and macroscopic (social) viewpoints. However, the broader concept about science may mislead understanding of the NOS. Consequently, this study provides some implication for improving the framework of the NOS and teaching the NOS in the classroom.

• 의학교육논단
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• 제15권3호
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• pp.151-158
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• 2013

Patient safety is achieved through systematic improvement based on the knowledge and willingness of medical professionals. A systematic longitudinal curriculum for patient safety is essential to prepare medical students and professionals. The purpose of this article is to introduce our experience with a 'workshop for developing a patient safety curriculum' and to compare the results with previous studies. The workshop comprising 15 medical professors and patient safety experts met for 2 days. The Consensus Workshop method was applied, collecting opinions from all of the members and reaching consensus through the following stages: context, brainstorm, cluster, name, and resolve. The patient safety curriculum was developed by this method, covering patient safety topics and issues, and teaching and assessment methods. A total of 7 topics were extracted, 'activities for patient safety, concepts of patient safety, leadership and teamwork, error disclosure, self-management, patient education, policies.' Issues, teaching methods, and assessment methods were developed for each topic. The patient safety curriculum developed from the workshop was similar to previous curricula developed by other institutions and medical schools. The Consensus Workshop method proved to be an effective approach to developing a patient safety curriculum.

• 스마트미디어저널
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• 제12권3호
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• pp.60-67
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• 2023

Hyperledger Indy는 탈중앙화 신원 증명 기술인 DID를 구현한 오픈소스다. Hyperledger Indy는 RBFT 합의 알고리즘을 사용하며 풀에 일정 수 이상의 문제 노드로 합의 부족이 발생하면 데이터 추가가 되질 않는다. 이는 노드를 추가하는 것으로 미연에 예방할 수 있으며 자동으로 동작시키기 위해 노드 모니터링 시스템을 구현하였다. 노드 모니터링 시스템은 풀의 상태를 지속해서 확인하며 특정수 이상의 문제 노드가 발생하면 자동으로 노드를 추가해 합의 문제가 발생하는 것을 방지한다. 이는 Hyperledger Indy의 가용성을 높여 줄 수 있으며 합의 알고리즘을 사용하는 다양한 블록체인 서비스에서 참고할 수 있는 연구이다.

• 제어로봇시스템학회논문지
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• 제18권7호
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• pp.617-621
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• 2012

This paper studies asymptotic consensus problem for linear multi-agent systems. We propose a distributed state feedback control algorithm for solving the problem under fixed and undirected network communication. In contrast with the conventional algorithms that use global information (e.g., graph connectivity), the proposed algorithm only uses local information from neighbors. The principle for achieving asymptotic consensus is that, for each agent, a distributed update law gradually increases the coupling gain of LQR-type feedback and thus, the overall stability of the multi-agent system is recovered by the gain margin of LQR.

• 전기전자학회논문지
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• 제22권1호
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• pp.121-126
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• 2018

본 논문은 관측기 기반의 제어기를 이용한 비선형 다개체 시스템의 일치문제를 다룬다. 이를 위하여 기존의 저이득 제어기에 고이득 접근방법을 결합한다. 리아푸노프 방법을 이용하여 제안한 관측기 기반의 일치 제어기가 삼각구조 비선형 시스템의 일치를 보장해줌을 보인다.

• 전자통신동향분석
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• 제33권1호
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• pp.45-56
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• 2018

A Blockchain is a type of distributed ledger system that consists of a large number of nodes. A block is a container in which transactions are included, and the transactions can be recorded in chronological order by chaining blocks. To work properly, it is essential that the nodes in the Blockchain system have the same image of the chained-blocks. Blockchain systems use various types of consensus algorithms to achieve the same states among the nodes, and the fundamental elements in these algorithms are proof of work and the main chain selection policy, particularly in permissionless Blockchain systems. However, consensus algorithms for permissioned Blockchain systems can be completely different from those of permissionless blockchain systems. In this paper, we overview the basic working mechanism of consensus algorithms, and briefly introduce a few that are currently being applied.

• 한국군사과학기술학회지
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• 제14권5호
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• pp.941-947
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• 2011

This paper deals with the consensus problem for multi-agent linear dynamic systems with directed communication topology. All the agents are identical high-order linear systems and their state information is exchanged through a communication network with directed graph. It is shown that a consensus is achieved if there exists a feasible solution to a set of linear matrix inequalities obtained for a simultaneous stabilization problem for multiple systems. Examples are presented to show the effectiveness of the proposed method.

• 지식경영연구
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• 제9권3호
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• pp.141-158
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• 2008

This study introduces the construct of group efficacy and combines the construct with the Adaptive Structuration Theory(AST) and user satisfaction framework. Job efficacy and IT efficacy identified as the dimensions of group efficacy are hypothesized to influence faithfulness of appropriation and consensus on appropriation. and then the user satisfaction of knowledge management systems(KMS). Data were collected through a survey of respondents who have the experience of using KMS, and analyzed by using structural equations modelling. The major findings of this study are as follows: First, job efficacy was found to have a positive influence on consensus on appropriation and user satisfaction. Second, IT efficacy was found to have a positive effect on faithfulness of appropriation and consensus on appropriation. Third, faithfulness of appropriation was found to have a positive influence on consensus on appropriation and user satisfaction. Implications of these findings are discussed for researchers and practitioners.