• Journal of Digital Convergence
• /
• v.18 no.4
• /
• pp.419-424
• /
• 2020

The purpose of this study is to find out whether changed interactions due to reformatting has a significant effect on the play attribute of children's play from an instrumental point of view. Based on the study of Roser Caillois theory of play (Agon, Mimicry, Area, Ilinx) and previous studies, a questionnaire was written and experimental design was carried out through brick stack which are most preferred in the whole development of children. Brick stack were selected from physical and electronic spaces and the survey was conducted with children's experiences by dividing into experimental group and comparative group. Correlation and T-test results, the brick stack by reformating showed significant difference in the play attributes (Agon, Mimicry, Area, Ilinx) of Rose Caillois and we found that the effectiveness of play is doubled in the electronic space. Play properties evenly distributed in electronic space brick stacking suggest that pleasure and fun can double.

• Journal of The Korean Association For Science Education
• /
• v.34 no.7
• /
• pp.657-666
• /
• 2014

To identify the gifted, it is essential to perform overall evaluation on cognitive and affective aspects considering all the characteristics of the science gifted. Nowadays, not only cognitive factors but also affective factors are being emphasized. Among the affective factors of the gifted, the task commitment is an important factor to describe the gifted and their outstanding achievements. From this research, by measuring the characteristics of task commitment shown in the science gifted, this can offer good implications regarding the selection of the gifted and the education. We developed the rubric of the gifted students by analyzing the students' experience of showing task commitment. By applying the rubric, we measured the levels by areas of the characteristics of task commitment shown in the experiences which the science gifted had by deeply exploring the cause or the principle. To better understand the characteristics of the science gifted students' task commitment, each and every students' characteristics were specifically described. The students' task commitment can be measured objectively and effectively by using the measuring tool in the form of rubric based on the characteristics of the task commitment. Specifically describing the students' characteristics on the basis of their performance criteria is the grounds for the level judgment and enhances the understanding of the characteristics of students' task commitment.

• Journal of The Korean Association For Science Education
• /
• v.37 no.4
• /
• pp.611-624
• /
• 2017

The purposes of this study are to explore Iceberg(IB) model as a systems thinking analysis tool for high school students, suggest a systems thinking analysis method using rubrics and verify its validity and reliability. For this study, the theoretical basis was examined through literature analysis about IB model and rubrics of evaluating the systems thinking. And 6 high school students participated in IB model activity and were interviewed about polar climate change. In addition, quantitative tests using systems thinking scale were also conducted to support the results of the IB model activity analysis. Data obtained from IB model activity was analyzed by using the rubrics of evaluating system thinking developed by Hung (2008). The analysis results were reviewed by two professors to confirm the validity and reliability. In order to confirm the validity, correlation analysis were performed between the rubrics and the quantitative test results. Finding are as follows: Six students used the IB model to express their systems thinking in detail and the results of the systems thinking analysis of students using rubrics showed a distribution of 17~35 points. Furthermore, the results of correlation analysis between rubrics and systems thinking scale was highly correlated (Pearson product-moment is .856) on significance level from .05. Using the IB model introduced in this study, students express their systems thinking effectively and the results of the systems thinking analysis using IB model is considered to analyze validity and reliability. Based on the results of this study, implication suggests how to study the systems thinking in science education.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
• /
• v.19 no.8
• /
• pp.940-945
• /
• 2008

In this paper, we have designed the Brick Transmit/Receive Module for K-band which can be applied to active phase array radar system. The proposed structure of T/R Module for K band is brick type for MCM(Multi Chip Module) form and the satisfaction of tile type T/R Module can apply to structure of cavity and main characteristic. The fabricated brick type T/R Module confirmed the main characteristic for electrical goal performance in test and this structure can be applied to active phase array radar.

• Proceedings of the Korea Information Processing Society Conference
• /
• 2019.05a
• /
• pp.62-64
• /
• 2019

4차 산업 혁명에 들어서며 블록체인 기술이 크게 주목받고 있다. 블록체인의 간단한 정의는 분산 환경에서 모든 노드들이 수정할 수 없는 원장을 관리 하는 것이다. 블록체인은 크게 public 블록체인과 private 블록체인으로 구분할 수 있다. 이중 private 블록체인에 대한 연구가 활발히 이뤄지고 있고, 실제 많은 기업이나 연구소에서 실제 환경이나 시스템에 적용 시키려는 노력을 하고 있다. 많은 블록체인 플랫폼 중 하이퍼레저는 가장 활발히 개발이 진행되고 있는 오픈 소스 프로젝트 중 하나이다. 하이퍼레저는 Linux Foundation에서 주관하는 프로젝트로 그 중 가장 널리 알려져 있는 플랫폼으로 패브릭이 있다. 패브릭은 private 블록체인 기술로 비즈니스 상황에서 조직간 블록체인 환경을 구성하는 것에 초점이 맞춰져 있는 플랫폼이다. 패브릭은 클라이언트가 트랜잭션을 제출한 후 원장에 저장될 때까지의 과정을 독립적으로 실행되는 3 단계로 구분해 놓고 있다. 3단계는 실행, 순서화, 검증 단계로 이루어져 있다. 본 논문에서는 실행과 순서화 단계에 대해 처리시간 분석을 진행한다. 분석한 데이터를 기반으로 어떤 단계의 영향이 가장 큰지 살펴보고 차후 연구에 이용할 것이다. 차후 연구는 실행과 순서화 단계에 대한 처리시간을 줄일 수 있는 연구를 진행할 것이다.

• Proceedings of the Korea Information Processing Society Conference
• /
• 2019.10a
• /
• pp.110-112
• /
• 2019

블록체인은 4차 산업혁명 핵심 키워드 중 하나이다. 하지만 현재 블록체인 기술을 접목시킨 사례는 굉장히 적다. 그것은 블록체인 시스템에서 트랜잭션을 처리하는 속도가 느린 것을 이유로 볼 수 있다. 기존에 빠른 속도로 많은 트랜잭션을 처리하던 시스템에 비해 느린 블록체인 기술을 접목시키는 것은 어려움이 있다. 때문에 블록체인 연구는 합의 알고리즘, 다양한 네트워크 구성 등을 이용하여 트랜잭션 처리 속도를 늘리는 연구들이 진행 중이다. 본 논문에서는 오픈소스 프로젝트인 하이퍼레저 패브릭의 트랜잭션 처리 속도를 향상시키기 위한 방법을 제안한다. 패브릭은 블록에 트랜잭션을 추가하기 위해 독립적으로 수행되는 3단계를 거쳐 수행된다. 그 중 1번째 단계인 보증 단계의 최적화를 진행한다. 패브릭에서 클라이언트로부터 피어가 반복적인 요청을 받을 때 매번 같은 네트워크에 속해 있는 노드인지 확인을 하게 되는데, 한번 보증을 완료한 노드는 일정 기간 동안 노드 확인을 거치지 않고 체인 코드를 수행하여 트랜잭션을 처리하도록 하는 방법을 제안한다.

• Proceedings of the Korean Society of Computer Information Conference
• /
• 2024.01a
• /
• pp.331-334
• /
• 2024

하이퍼레저 패브릭(Hyperledger Fabric)은 참여자의 신원을 확인하고, 정보교환(트랜잭션)의 유효성을 검증하는 허가형 블록체인 모델이다. 기존의 대표적인 블록체인 모델인 비트코인, 이더리움과 대비하여 효율적인 데이터 검증 방안이 가능한대, 체인코드와 채널, 그리고 피어를 중심으로 구성되어 있기 때문이다. 먼저 본 블록체인 모델은 '체인코드'라는 스마트 계약(컨트랙트)를 실행하며 허가된 사용자만 네트워크에 참여할 수 있다. 또한, '채널' 기능이 있어 서로 다른 조직 간의 데이터 공유와 검증에 대한 새로운 접근방식을 보여줄 수 있으며, 특정 네트워크 내에서 데이터를 분리할 수 있다. 이를 통해 특정 데이터에 대한 접근권한을 제어하는 기능을 제공하며 동시에 데이터의 신뢰성과 보안성을 높일 수 있다. 마지막으로 '피어'는 체인코드를 통해 들어온 트랜잭션을 검증하고, 유효한 데이터만 원장에 추가하는 기법으로 무결성을 유지하는 데 중요한 역할 담당하고 있다. 본 연구결과를 기반으로 하이퍼레저 패브릭을 효과적으로 활용하여 데이터 검증 프로세스가 산업계에 널리 적용될 수 있기를 기대한다.

• Composites Research
• /
• v.25 no.6
• /
• pp.198-204
• /
• 2012

The objective of this study is to improve the mechanical properties in abaca fabric/epoxy composites produced using a VARTM process. The mechanical properties were improved by increasing the surface roughness of the fabric through plasma polymerization and improving the interfacial adhesion between the epoxy and the fabric through changing its hydrophilic properties to the hydrophobic properties. Plasma polymerization at atmospheric pressure and room temperature was used, and the optimal polymerization time to improve the mechanical properties was investigated. NaOH treatment on the fabric was also carried out for the comparison. The composite fabricated using the fabric polymerized for 10 seconds shows the highest tensile strength compared to that of none-polymerized or NaOH treated. Plasma polymerization for more than 20 seconds exhibits decrease in the tensile strength. As a result, the plasma polymerization for more than 20 seconds may have caused some damages on the surface of the fabrics. Also, the hydrophilic abaca represents a tendency of presenting the hydrophobic properties in absorption and sedimentation tests.

• The Journal of Korean Institute for Practical Engineering Education
• /
• v.4 no.2
• /
• pp.13-23
• /
• 2012

The purpose of this study is to identify and develop a rubric for assessing the practice test in national technical qualification with validity and objectivity. There are three specific purposes for this study. First. we suggest some issues to consider when we develop a rubric. Second, we suggest the general procedure and main factors in developing a rubric. Third, we identify some problems and suggest some improvement measures for the rubric in national technical qualification examination. The procedure for developing a rubric is as follows; decisions of task, the relation with goal, classify of performance level, and validity. Also, there are five main factors as follows; contents, criteria, practicality, credibility, and objectivity.

• Transactions of the Korean Society of Mechanical Engineers B
• /
• v.38 no.3
• /
• pp.197-202
• /
• 2014

The efficiency of a catalytic converter depends on the flow distribution across a system's chemically active substrate. If irregularities or non-uniform flow patterns exist, the system's conversion efficiency decreases, whereas the manufacturing cost increases. Therefore, it is important to analyze the internal flow of a catalytic converter. In this study, flow pattern measurements along the minor axis were recorded at the mid and exit planes of a ceramic honeycomb catalytic converter at flow rates of 37.8 l/s and 94.4 l/s. Flow distributions of the measurement plans were compared with an automotive company's computed velocity profiles. Measurements along the minor axis showed uneven velocity profiles. The ${\upsilon}$-velocity components between the honeycomb bricks were small but somewhat erratic opposite the intake side of the converter, however, they became flatter in measurements recorded near the intake entrance. For almost all velocity values, the computer model suggested velocities greater than the measured values.