• 한국초등과학교육학회지:초등과학교육
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• 제31권1호
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• pp.40-56
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• 2012

The purpose of this study was to understand the teaching effects after conducting ASI module in the open inquiry activities of the elementary science class. in order to understand the effects of ASI(Authentic Scientific Inquiry) module application using science research notes in open inquiry activities to students' science research ability. The results of this study were as follow. First, the after test results were covariance-analyzed to be the effects to science process skills were statistically significant in 0.5 significance level. Second, in the covariance analysis of the after test of the study group and the comparative group, the effects to scientific creative problem solving skills were statistically significant in 0.5 significance level. Third, the covariance analysis of the after test in the effects of ASI module application using science notebooks to students' scientific attitude revealed that the two groups' average difference was statistically significant in 0.5 significance level. In conclusion, application of the ASI module using science notebooks had a positive effect on improvements of students' science process skills, science creative problem solving ability and scientific attitude. Therefore, the ASI module using science notebooks is hopefully to be provided as an effective instructive strategy in the open inquiry activities courses in school in the future.

• 정보처리학회논문지A
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• 제14A권4호
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• pp.197-202
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• 2007

본 논문에서는 OpenGL-ES 기반의 모바일 3D 블루투스 게임 엔진을 설계 및 구현하였다. 기존 모바일 3D 네트워크 게임에서는 Wap(Wireless Application Protocol)과 VM 방식(Network)을 이용한 무선인터넷 게임이 주류를 이루고 있다. 그러나, 이들 모바일 네트워크 게임의 단점으로 지적되는 무선 네트워크 접속에 따른 지나친 통신 요금의 부담으로 인해 VM 형태를 기반으로 하는 다운로드형 게임 즉, 단독형 게임이 인기를 끌고 있다. 본 논문에서는 이러한 모바일 네트워크 게임의 단점을 해결하기 위해 모바일 3D 표준(C언어 기반)인 OpenGL-ES로 근거리에 있는 사람들이 무선 인터넷에 접속하지 않고, 모바일 3D 네트워크 게임을 즐길수 있는 모바일 3D 블루투스 게임 엔진을 제작하며, 다수의 블루투스 단말기 상에서 패킷 데이터를 전송할 때, 블루투스 처리 속도를 향상시키는 스케줄링(Scheduling) 방법을 제시한다.

• 한국초등수학교육학회지
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• 제7권1호
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• pp.23-44
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• 2003

수학적 맥락 정보를 이용한 문제가 주어졌을 때, 학생들의 문제 해결 활동을 관찰하고 인지적 측면과 정서적 측면에서 분석하였다. 수학적 맥락 문제들은 Freudenthal의 수학 교육 이론과 RME에 따라 구성하였다. 그 결과, 개방된 형태의 맥락 문제가 보다 다양한 풀이를 산출해냄을 알 수 있었다. 따라서 교사는 스스로 형식적 수학을 재발명하고, 학생들로 하여금 그에 걸맞은 인지적 활동이 이루어지도록 나름대로의 교수 학습 방법을 개발하여야 한다.

• East Asian mathematical journal
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• 제32권4호
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• pp.545-563
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• 2016

The aim of this study was to observe processes and implication to a given program for the 20 gifted children grade 5 by making the number from 1 to 100 with natural numbers 4,4,9 and 9. Revelation of creativity, mathematical tendency of students and meaningful responses were observed by the qualitative records of this game activity and the analysis of result. The major result of a study is as follows: The mathematical creativities of students were revealed and developed by this activity. And the mathematical attitude were changed and developed, so student could actively participate. And students could experience collaborative and social composition learning by presentations and discussion, competition with a permissive atmosphere and open-game rule. It was meaningful that mathematical ideas (negative number, square root, factorial, [x]: the largest integer not greater than x, absolute value, percent, exponent, logarithm etc.) were suggested and motivated by students themselves.

• 제어로봇시스템학회논문지
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• 제11권12호
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• pp.1002-1010
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• 2005

We study on the implementation of reconfigurable position control system which is based on Open Control Platform(OCP) for Unmanned Expedition Vehicles(UEV) in ubiquitous environment. The control system uses hierarchical control structure and OCP structure which contains three layers such as core OCP, reconfigurable control API(Application Programmer Interface), generic hybrid control API. The goal of our research is to implement an UEV control system using advanced software technology. As a specific control problem, we study a transition management problem between PID control and neural network control depending on fault or parameter change of the plant, i.e., UEV. The concept of the OCP-based software-enabled control can provide synergy effect by the integration of software component, middleware, network communication, and control, and thus can be applied to various systems in ubiquitous environment.

• 제어로봇시스템학회논문지
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• 제13권9호
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• pp.856-860
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• 2007

This paper presents a robust tracking controller design method for the track-following system of an optical recording device. A tracking loop gain adjustment algorithm is introduced to accurately estimate the tracking vibration quantity in spite of the uncertainties of the tracking actuator. A minimum tracking open-loop gain is calculated by the estimated tracking vibration quantity and a tolerable limit of tracking error. A robust tracking controller is designed by considering a robust $H_\infty$ control problem with the weighting function of a slightly larger gain than the minimum tracking open-loop gain. The proposed controller design method is applied to the track-following system of an optical recording device and is evaluated through the experimental result.

• 대한기계학회논문집B
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• 제37권6호
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• pp.539-544
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• 2013

본 연구는 공개 해석프로그램과 상용 최적화 프로그램을 연계하여 역열전도 문제를 해결하는 방법론을 제시하고 구현하였다. 이 해석 방법은 구동이 간단하며, 내부 코딩 없이도 구동이 가능하기 때문에 다른 연구자들도 쉽게 역열전도 문제를 재현할 수 있다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1999년도 하계학술대회 논문집 A
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• pp.130-132
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• 1999

The finite element method (FEM) is suitable for the analysis of a complicated region that includes nonlinear materials, whereas the boundary element method (BEM) is naturally effective for analyzing a very large region with linear characteristics. Therefore, considering the advantages in both methods, a novel algorithm for the alternate application of the FEM and BEM to magnetic field problems with the open boundary is presented. This approach avoids the disadvantages of the typical numerical methods with the open boundary problem such as a great number of unknown values for the FEM and non-symmetric matrix for the Hybrid FE-BE method. The solution of the overall problems is obtained by iterative calculations accompanied with the new acceleration method.

• International Journal of Internet, Broadcasting and Communication
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• 제15권3호
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• pp.203-210
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• 2023

In this paper, we develope a stock trading system that automatically buy and sell stocks in Kiwoom Securities' HTS system. The system is made by using Kiwoom Open API+ with the Python programming language. A trading strategy is based on an enhanced system query method called a Condition-Search. The Condition-Search script is edited in Kiwoom Hero 4 HTS and the script is stored in the Kiwoom server. The Condition-Search script has the advantage of being easy to change the trading strategy because it can be modified and changed as needed. In the HTS system, up to ten Condition-Search scripts are supported, so it is possible to apply various trading methods. But there are some restrictions on transactions and Condition-Search in Kiwoom Open API+. To avoid one problem that has transaction number and frequency are restricted, a method of adjusting the time interval between transactions is applied and the other problem that do not support a threading technique is solved by an IPC(Inter-Process Communication) with multiple login IDs.

• 한국초등과학교육학회지:초등과학교육
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• 제29권3호
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• pp.262-276
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• 2010

The purpose of this study was to investigate and analyze the elementary teachers' views and students' views about the difficulties in teaching and learning on open inquiry activities of elementary school science. Semi-structured interviews were conducted individually with three elementary teachers who have serviced more than three years, and with twenty four elementary students attending schools located in Cheongju City. And their anecdotes were collected and analyzed. The interview questions were developed through Seidman's steps to acquire the reliability in the interview data. From the interviews and anecdotes, we found that elementary teachers' views about the difficulties of teaching open inquiry activities: the difficulties of teaching in finding inquiry problem and planning inquiry, the difficulties of managing group activities, the difficulties of managing class hours for inquiry, the lack of the students' inquiry abilities, and problems on students' affective characteristics. And the students have the views about the difficulties in doing open inquiry activities: the difficulties of finding inquiry problem and planning inquiry, being unaccustomed to write reports, the troubles with investigating, problems on affective characteristics, the difficulties of joining in a group, and the lack of inquiry abilities. The teachers give suggestions for effective application of the open inquiry activities: first, the teachers must encourage students' emotion and will in doing open inquiry activities, second, there must be the steady inquiry teaching and learning in ordinary elementary science classes. Based on the results, this study suggested that elementary teachers should concern specially about students' being unaccustomed to write reports and the troubles in doing scientific investigation.