• Journal of Korean Society of Steel Construction
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• v.28 no.2
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• pp.65-74
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• 2016

A finite element dynamic simulation is performed to gain an insight about the stiffened blast wall structures subjected to blast loading. The simulation was verified using qualitative and quantitative comparisons for different materials. Based on in-depth examination of blast simulation recordings, dynamic behaviors occurred in the blast wall against the explosion are determined. Subsequent simulation results present that the blast wall made of the high performance steel performs much better in the shock absorption. In this paper, the existing finite element shock analysis using the LS-DYNA program is further extended to study the dynamic response of the stiffened blast wall made of the high-performance steel considering high strain-rate effects. The numerical results for various parameters were verified by comparing different material models with dynamic effects occurred in the stiffened blast wall from the explosive simulation.

• Journal of the Computational Structural Engineering Institute of Korea
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• v.22 no.3
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• pp.243-250
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• 2009

In order to reduce the time needed for design, enterprises recently need the customizing technology that can modify the functions of existing CAD systems according to the their purposes. So most of the companies developing commercial CAD system are providing API to make possible the preparation of macro or external programs, which allow automatic performance of a series of repeated tasks. The objective of the present paper is to achieve more convenient carrying out of a particular modeling, by developing 3D CAD template of the standardized engineering rule of the particular model in order to establish a knowledge-based product development system. The formula, data and design knowledge which are required for the designing of the components of refrigerator were made into a program by means of Unigraphics' UG/Open API. And examples of such a development were presented. By using them in connection with commercial CAD system, design verification and modification were efficiently applied to the product design business.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.8 no.1
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• pp.192-199
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• 2004

As the construction site becomes larger, more complex and more special, the information of construction is expanded in quantity and specialized in quality. Therefore the computing system is necessary to effectively manage the construction schedule management. At present, main office at construction site bring in the computing system to perform the schedule management, so the data input and access for schedule management is performed by engineer on foot between construction site and main office. Therefore in this paper, we arrange wireless communication system between construction site and main of office and develop application program for data input and access of schedule management immediately using PDA at construction site. Through the our system we can improve the schedule management at construction site, and we can look forward to reduction of manpower, equipments, time, and money in whole construction.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2020.07a
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• pp.607-610
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• 2020

21세기 핵심 키워드 중 하나로 두뇌 산업이 떠오르고 있다. 미국, 일본 등 선진 국가에서는 이미 뇌 연구에 활발한 투자가 진행되고 있다. 이에 따라 본 논문에서는 출생과 성장기 뇌 발달에 문제가 발생하는 발달 장애 아동을 위한 음악 치료 프로그램을 개발하고자 한다. 효과적인 발달 장애 치료를 위해, 조기 발견 후 인지 학습 치료가 필요하다. 그 중 인지 기능과 자가 관리 기능을 기르는 것이 중요한데, 리듬 타이밍 훈련이 발달 장애 아동의 기억 능력 개선에 도움이 된다는 여러 입증된 연구 결과가 있다. 그러나 아직까지 발달 장애 아동을 위한 적절한 치료 방법이 없기에 본 논문에서는 인지 학습 치료가 필요한 아동에게 도움을 주기 위해 동요의 정확한 리듬, 음정을 학습하는 프로그램을 제안한다. 아동의 지속적인 흥미를 끌 수 있는 게임과 인지능력 훈련을 결합하였기에, 보다 좋은 학습 효과를 유도할 수 있을 것이다.

• Proceedings of the KIEE Conference
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• 2005.07c
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• pp.2253-2255
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• 2005

운전 중인 회전기기에서 고정자 권선의 절연 상태는 부분방전시험을 통해 검사, 평가할 수 있고 이를 통하여 사고예방을 위한 진단을 할 수 있다. 기존 센서인 SSC(Stator Slot Coupler)는 비접촉식으로 권선의 웨지 아래에 설치하므로 설치하기가 불편하고 Global VPI 방식으로 제작된 소형 회전기에는 사용할 수 없는 단점이 있다. 본 논문에서는 소형 회전기에 사용 가능한 저, 고주파용 부분방전 센서를 제안하였다. 웨지 위에 설치 가능한 SSC 형태의 마이크로스트립 센서 및 2선 평행 전송선로 센서는 고주파에 적합하고 저렴하며 소형 회전 기에 설치 가능하다. 센서의 성능을 검증하기 위해 3차원 해석 프로그램을 사용하여 좋은 전자파 검출 성능을 도출할 수 있었다. 또한 저주파용으로 제안된 U 타입 센서는 유도전류를 검출하는 센서로서 슬롯 외부에 설치되어야 하고 시간차분 수치해석을 이용해서 저주파에서 효과적으로 방전 펄스를 검출함을 확인할 수 있었다.

• Journal of KIISE:Computer Systems and Theory
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• v.28 no.5
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• pp.236-244
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• 2001

디스크배열 또는 RAID 시스템은 저렴한 비용으로 대용량 저장공간을 제공할 수 있으나, VOD 서비스와 같은 대규모 멀티미디어 서비스에 대해서는 아직 충분한 입출력 속도를 지원하지 못하고 있다. 보다 높은 대역폭을 지원하기 위해 다수의 디스크 컨트롤러를 채용한 다중 디스크배열에서 스트라이프를 전체 디스크에 효과적으로 분산시키기 위한 수직 스트라이핑 모델이 이용되고 있다. VOD 서비스 이용자가 고품질의 동영상을 감상하기 위해서는, 응용프로그램이 요청한 마감시간까지 저장장치에 기록되어 있는 데이터를 읽어와야 한다. 본 논문에서는 효과적이 VOD 서비스 지원을 위해, 다중 디스크배열에서 각 디스크 컨트롤러의 지역 요청큐로 분산된 입출력 요청들을 스케쥴링하여 마감시간 초과율(deadline miss rate)을 줄이기 위한 알고리즘을 제안한다. 이 알고리즘은 VOD 서버와 같이 데이터 읽기 작업이 많은 멀티미디어 서비스에 적합하도록 설계되었다. 시뮬레이션 결과, 제안된 알고리즘이 마감시간 초과율을 평균 41.5% 감소시킴을 알 수 있었다.

• Journal of the Korea Convergence Society
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• v.10 no.12
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• pp.369-376
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• 2019

The purpose of this study was to the effects of exercise intensities in physical activity of 8 weeks, on fitness, blood lipid for middle school students with intellectual disabilities. Participants of the research were allocated by low-intensity(n=8, 40~54%HRR), middle-intensity(n=8, 55~69%HRR), and high-intensity(n=9, 70~85%HRR) exercise groups wirelessly. For setting and maintenance of individual exercise intensity, wireless heart rate monitor(RS-400, POLAR, Finland) was used. Fitness, BDNF, and blood lipid were measured equally before participating in physical activity and 8 weeks after participation. As a result, fitness and agility of high-intensity exercise group were significantly increased than low-intensity exercise group. BDNF of high-intensity exercise group was also significantly increased than low-intensity exercise group. For blood lipid, only total cholesterol showed differences by exercise intensity group and exercise group more than middle intensity showed significant reduction. In conclusion, when giving same exercise to middle school students with intellectual disabilities, fitness and BDNF were increased the mostly in high-intensity exercise group and total cholesterol was effective from the exercise of more than middle intensity.

• Journal of the Earthquake Engineering Society of Korea
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• v.10 no.2 s.48
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• pp.73-81
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• 2006

The purpose of this study is to investigate the inelastic behavior of reinforced high-strength concrete bridge columns. A computer program, named RCAHEST (Reinforced Concrete Analysis in Higher Evaluation System Technology), for the analysis of reinforced concrete structures was used. Material nonlinearity is taken into account by comprising tensile, compressive and shear models of cracked concrete and a model ol reinforcing steel. The smeared rack approach is incorporated. The increase of concrete strength due to the lateral confining reinforcement has been also taken into account to model the confined high-strength concrete. The proposed numerical method for the inelastic behavior of reinforced high-strength concrete bridge columns is verified by comparison with reliable experimental results.

• The Journal of Korean Association of Computer Education
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• v.17 no.2
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• pp.77-86
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• 2014

By PISA 2007, TIMSS 2011, Korean high school students had high academic achievement to science and mathematics, while they had low attitude. Prospective college students are increasingly avoiding natural science and engineering. Moreover, the opportunities to learn to computer science in middle and high school are disappeared rapidly. The necessity of STEAM program based on Physical computing arise under these situation. Therefore, we developed STEAM program and studied the effects of the program in 2012. The result showed that students' scientific interests and attitude, scientific problem solving ability, scientific creative problem solving ability, personality test for children, and satisfaction of school life were enhanced. This study is follow-up study for the same students who improved every domain of the measurements. They were administerd pre-test at start of 2012, post-test at end of 2012, and delayed post-test at the end of 2013, on same test. The result of the study showed that only attitude to Scientific Inquiry was enhanced, but there was no significant result on the other domain of the test in comparison with start of 2012. But this result demonstrate the effect of STEAM education conversely.

• Child Health Nursing Research
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• v.20 no.3
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• pp.205-214
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• 2014

Purpose: The purpose of the study was to develop and evaluate the effect of a metabolic syndrome prevention program using mobile application for university students. Methods: A pretest-posttest design with content analysis as a triangulation method was used. The participants were 49 university students. Data were analyzed using descriptive statistics, $x^2$-test, t-test and Fisher's exact test with the SPSS WIN 18.0 program. Results: The application consisted of six main menus as follows: 'basic education', 'nutrition education', 'exercise education', 'meal diary', 'exercise checkup', and 'tips'. The experimental group had higher recognition about metabolic syndrome prevention than the control group (F=7.919, p=.007). Understanding of metabolic syndrome among participants was mostly related to chronic diseases such as obesity, hypertension and diabetes in relation to the importance of eating habits and exercising. Conclusion: The results indicate that metabolic syndrome prevention education using mobile application is necessary and would be useful for university students.