• Journal of The Korean Association For Science Education
• /
• v.32 no.1
• /
• pp.129-145
• /
• 2012

This study investigated factors of creativity and interaction between factors that are revealed when gifted students designed scientific experiments. For this, we firstly developed items which required the written process of designing experiments to explore creativity factors. Then, we used these items as a part for letters of self-introduction to students who applied for 2011 correspondence education of general physics for the Korea Physics Olympiad. 513th letters of self-introduction which were analyzed to investigate factors of creativity in view of creativity definition after researchers' consultation, which specifically means a combination of divergent and convergent thinking. The results were as follows; (1) in the step of hypothesis building, we could not only find Originality and the Flexibility & Fluency, which were factors of divergent thinking, but also Coherency and Elaborateness, which were factors of convergent thinking. (2) in the step of the hypothesis testing, we could explore Originality, Flexibility & Fluency in divergent thinking and Coherency, Reliability, Clarity, Elaborateness in convergent thinking. (3) we also figured out three creativity types of gifted students from the viewpoint that creativity is a consequence of interaction between divergent thinking and convergent thinking; a) Type A showed divergent and convergent factors of creativity in the step of hypothesis building. However, type A did not include divergent factors of creativity on the process of the hypothesis testing. b) Type B had divergent and convergent factors of creativity on the process of the hypothesis testing, but it had not convergent factors of creativity on the step of hypothesis building. c) Finally, in Type C, only divergent factors of creativity appeared on the process of the hypothesis testing, but convergent factors of creativity could be found on the step of hypothesis building and hypothesis testing.

• Proceedings of the Korea Information Processing Society Conference
• /
• 2006.05a
• /
• pp.665-668
• /
• 2006

이동 물체 검출 및 추적은 과중한 연산량에 의해 초당 처리할 수 있는 프레임의 수가 적게 되거나 정합 과정이 단순하여 추적을 실패하는 문제점들이 있다. 본 논문에서는 동영상내에서 이동 물체를 검출하고 추적하는 새로운 접근 방법을 제안한다. 입력된 영상으로부터 배경과 물체를 분리하기 위해 background subtraction을 이용하였고, 분리된 물체들은 이진 연결 요소 분석을 통하여 세그먼트 된다. 그리고 물체의 추적을 위하여 Kalman filter를 사용하였다. 본 논문의 실험에서는 야외에서 촬영한 비디오 시퀀스를 이용하였으며, 물체 검출 및 추적이 조명 변화, 그림자에도 잘 적응함을 증명하였다.

• Journal of the Korea Institute of Military Science and Technology
• /
• v.4 no.2
• /
• pp.60-69
• /
• 2001

전달정렬은 MINS와 SINS의 비정렬 요소를 칼만필터로 추정하는 기법으로서 본 논문에서는 속도 및 자세정합 칼만필터 설계 결과를 제시하였다. 그리고 설계된 칼만필터는 항법컴퓨터에 실현되어 성능평가가 실행되었는데 성능평가 방법은 실제 함정에서 시험의 어려운 점을 고려하여 실험실에 설치된 3축 각운동 시뮬레이터를 이용하는 방법을 제시하였다. 이러한 성능평가 결과는 전달정렬 설계과정에서 예측되었던 성능 및 특성과 일치하였다.

• Proceedings of the Korea Contents Association Conference
• /
• 2017.05a
• /
• pp.3-4
• /
• 2017

일련의 캐릭터를 표현할 경우 대상의 외형은 물론 질감표현 역시 중요한 요소이다. 3D 프린터의 보편화로 외형 표현은 비교적 쉽게 이루어질 수 있으나 질감표현은 여러 한계로 인해 표현이 어렵다. 본 연구는 2D 이미지 기반의 UV 맵 및 관련 입체화 기능을 활용해 3D 프린팅에 적용 가능한 재질표현 과정을 기술한다. 사실적 재질 표현을 위해 3D 모델의 UV 맵과 그 위에 여러 물성의 재질을 부착 후 정합하여 그 결과의 효과도 논의하고자 한다.

• ICROS
• /
• v.21 no.4
• /
• pp.27-33
• /
• 2015

단일 센서 기반의 표적 탐지 문제에서 센서의 한계 요소에 의해 탐지 성능이 제한된다. 따라서, 최근 단일 센서 기반의 표적 탐지 성능을 향상시키기 위한 방안으로 각 센서의 강점을 효과적으로 융합하는 다중 센서 정보 융합 기반의 표적 탐지 기법에 대한 연구가 활발히 진행되고 있다. 센서 정보 융합을 위해서는 각 센서별 영상 획득, 각 영상의 기하학적 정합, 센서 정보 융합 기반의 표적 탐지 기술이 필요하며, 본 논문에서는 이에 대한 기술 및 개발 동향을 소개한다.

• Information and Communications Magazine
• /
• v.31 no.12
• /
• pp.89-96
• /
• 2014

본고에서는 사용자의 콘텐츠 이용 방법 및 선호 요소를 능동적으로 수용하고 반영하는 접근성 메타데이터 서술 및 그들의 정합을 실현하는 접근성 플랫폼 구성 개요와 모형을 제시하고 그것의 개발과 서비스에 적용될 표준화 가능 항목과 범위를 제안한다. 본 제안은 사용자 개인화 및 접근성이 제공되는 전자책, 사이버 가정학습, 디지털 교과서의 표준에 따른 제작에 기여할 것으로 생각한다.

• The Journal of the Acoustical Society of Korea
• /
• v.40 no.5
• /
• pp.408-416
• /
• 2021

In the ultrasonic dispersion, in order to avoid direct contact of the radiation surface of ultrasonic transducers with a liquid sample, the liquid sample is separated by a glass container and it receives ultrasonic energy through an acoustic medium. The transmission efficiency of the ultrasonic energy in the multi-layered ultrasonic system is an important factor. In this study, we suggested a method that can improve the ultrasonic energy transfer efficiency by using a propylene glycol solution as a liquid matching layer in the multi-layered acoustic system. In this method, a propylene glycol solution was filled between the Langevin-type ultrasonic transducer and the luminol solution and the sonoluminescence phenomena in the luminol solution, which is caused by nonlinear effect of high power ultrasound radiated from the transducer, was examined by using a Photo Multiplier Tube (PMT). The transmission efficiency depending on the concentration of propylene glycol solution was observed, and we can see that as the concentration of the propylene glycol solution increased, the matching effect increased while the acoustic attenuation increased. It was confirmed that there is an optimal concentration compromised these two conflicting conditions, and the optimum concentration of the propylene glycol solution was determined experimentally.

• The Journal of the Acoustical Society of Korea
• /
• v.21 no.7
• /
• pp.592-599
• /
• 2002

In this study, an ultrasonic transducer was designed with a commercial finite element analysis (FEA) code, PZFlex, and fabricated based on the design. The transducer has the dimension and shape suitable for abdomen diagnosis working at 5 ㎒ and consists of 128 piezoelectric elements disposed in a convex linear array form. The transducer is composed of two impedance matching layers, one backing layer, and kerfs placed between the piezoelectric elements. Validity of the design with the FEA was illustrated through experimental characterization of a sample transducer. Comparison with the design results by equivalent circuit analysis method was also made to check the superiority of the FEA design.

• The Journal of the Korea institute of electronic communication sciences
• /
• v.15 no.5
• /
• pp.913-922
• /
• 2020

In this paper, we propose a LoRa communication module using the LoRa RF module of Murata Electronics is designed to configure the IoT digital meter remote meter reading and a method of configuring a remote meter reading network by collecting multiple meter data in a DCU (Data Concentrate Unit) to configure a network with LoRaWAN. The developed system can be installed more easily and economically in the network configuration than the existing system by allowing the meter to be directly connected to the network or matched with a DCU to connect to the network according to the configuration of the consumer. The developed system was constructed using a digital water meter as an example, but it can also be applied to remote meter reading of the metered values of other meters such as electricity, water, gas, hot water and calorie meters. The main development contents are the design, configuration, and construction of digital meters, LoRa modules and DCUs, and how to connect the LoRaWAN network and transmit meter data to the server. By networking these devices, the system is configured, and the actual LoRaWAN communication is tested and the result is shown.

• Journal of the Korea Computer Industry Society
• /
• v.4 no.10
• /
• pp.731-740
• /
• 2003

Since motion estimation remove the redundant data to employ the temporal correlations between adjacent frames in a video sequence, it plays an important role in digital video coding. And in the block matching algorithm, search patterns of different shapes or sizes and the distribution of motion vectors have a large impact on both the searching speed and the image quality. In this paper, we propose a new fast block matching algorithm using the small-cross search pattern and the block-based gradient descent search pattern. Our algorithm first finds the motion vectors that are close to the center of search window using the small-cross search pattern, and then quickly finds the other motion vectors that are not close to the center of search window using the block-based gradient descent search pattern. Through experiments, compared with the block-based gradient descent search algorithm(BBGDS), the proposed search algorithm improves as high as 26-40% in terms of average number of search point per motion vector estimation.