• Journal of Korea Society of Industrial Information Systems
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• v.22 no.5
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• pp.39-49
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• 2017

A Space Launch Vehicle (SLV) for Launching Satellites Consists of Multi-stage Rockets for the Purpose of Efficient Flight and Accomplishes the Launch Mission through Flight Events such as Stage Separation, Engine Start and Stop. In this Process, the SLV is Supposed to Undergo the Processes of the Powered Flight Section in which the Engine Generates Thrust and the Ballistic Flight Section in which there is no Thrust Repeatedly. Because it is Difficult to Express these Flight Characteristics of the SLV as a Single Dynamics Model, much Research on Tracking Algorithms using Multiple Models has been Undertaken. In case of using the Multiple Model Tracking Algorithm, it is Expected to Improve the Tracking Performance of the SLV. However, it is Difficult to Select Proper Dynamics Models to be used and the Calculation Amount Increases due to the use of Multiple Models. In this Paper, we Propose a Method to Track the SLV with Diverse Flight Characteristics Efficiently by only Two Kalman Filters using Constant Acceleration Model and Adaptive Singer Model.

• Proceedings of the Costume Culture Conference
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• 2003.04a
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• pp.92-93
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• 2003

인간의 사고와 감정은 여러 가지 상징을 통해서 표현되어진다. 여러 가지의 상징물 중에서 인간과 가장 밀접한 물질 문화인 복식은 모든 시대, 모든 문화권에서 존재해 왔다는 보편성 과 가시성으로 인하여 개인의 내면적 특성인 기분과 감정을 고찰하기에 적합한 상징물로 인정받고 있다. 그러므로 복식은 성, 연령, 직업, 국적, 사회적 계급, 종교, 정치적ㆍ경제적 상태, 집단 소속, 권위, 가치관 등을 나타내는 무언의 의사 전달체라고 할 수 있다. (중략)

• Proceedings of the Korea Institute of Convergence Signal Processing
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• 2000.08a
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• pp.201-204
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• 2000

본 논문에서는 기존의 칼라 항상성(color constancy) 알고리즘을 기반으로 한 새로운 영상 복원 방법을 제안한다. 이 방법은 인간의 시각 특성을 선형 모델로 표현한 칼라 항상성 모델을 이용한다. 칼라 항상성 모델에서 가장 중요한 과정은 영상의 광원을 추정하는 것이다. 이론 위하여 영상에서 명도 값이 가장 큰 화소의 값을 이용하며, 이 값을 각 수광체(photoreceptor)의 응답으로 대체한다. 추정된 광원을 이용하여 만들어진 영상을 일정한 비율로 스케일링하여 영상을 복원한다. 실험을 통하여 제안한 항법으로 영상 복원이 잘 됨을 알 수 있었다.

• Proceedings of the Korea Contents Association Conference
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• 2009.05a
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• pp.1010-1014
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• 2009

Acceleration of the globalization process as they are internationally accepted, standardized. A lot of somebody started to feel tired of the standards symbols, and like to pursuit the original and natural, and hope that the new interest in the emergence of visual symbols. Dongba (東巴文字) text are Naxi(納西族) Dongba pictograph (象形文字) of a concrete nature in china, Characterized by simplicity, abstraction, associative, interesting, decorative, symbolic etc. These features can quickly identify and satisfy to the people's demand for special aesthetic.

• Proceedings of the Korean Society of Computer Information Conference
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• 2021.07a
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• pp.643-644
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• 2021

최근 가상 디지털미디어에 대한 관심이 집중되고 있는 시대적 상황에서 물의 다양한 속성에 관한 시공간적 표현은 동시대 매체 미술에서 중요한 의미를 지닌다. 본 연구는 물의 표면을 경계(boundary)로 그 경계면의 상하 공간, 경계면과의 거리감, 물그림자, 물의 투영성 등을 통한 시공간 표현에 관한 것이다. 대상 작품으로는 빌 비올라의 을 중심으로, 레안드로 에를리치의 설치 작품, 데이비드 호크니의 회화를 사례로 제시한다. 다양한 미술 매체를 통해 변형된 시공간성은 물 표면이라는 매개체와의 관계적 특성 안에서 이미지의 환상성을 부각한다.

• The Journal of Engineering Geology
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• v.14 no.2
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• pp.147-168
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• 2004

Purpose of this study is to quantitatively characterize the fracture roughness which was measured with a confocal laser scanning microscope. The roughness discrete data measured by confocal laser microscope were analyzed by spectral analysis and fast Fourier transform (FFT).The roughness data by used noise reduction filter were applied for fractal analysis to describe roughness features quantitatively. Artificial fractures created by Brazilian test on granites were used to measure fracture roughness under the confocal laser scanning microscope. Measurements were performed along three scan lines on each fracture surface. 36 scan lines were determined on 12 specimens in total. Features of roughness showed that coarse and medium grained granites tend to more rough features than those of fine grained granites. Continuous analog data of roughness is possible to described as discrete data of measure roughness with a fixed interval under the confocal laser microscope. Results of FFT with the measured data showed the highest values on the second harmonics. Distribution of average amplitude of second harmonics was observed 0.9853 in coarse grained granite, 1.0792 in medium grained granite and 0.6794 in fine grained granite. This indicates that the larger roughness has the higher energy of harmonics as the result of fractal analysis in low frequency zone.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.30 no.3
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• pp.243-251
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• 2019

Recently, several studies were conducted on the micro-Doppler(MD) phenomenon to identify a warhead from decoys. Both, the warhead and decoy, can be modeled as various shapes and maneuver with their own micro-motion. Their MD phenomenon can be demonstrated by amplitude modulation and phase modulation. Most studies have utilized approximate solutions to express the amplitude modulation regardless of various warhead and decoy shapes. However, the exact solution of the amplitude modulation is required for more effective warhead identification. In this study, we proposed a new modeling method of receiving radar signals from warheads and decoys based on physical optics. The proposed solution was evaluated using an electromagnetic prediction technique and computer-aided design models.

• Annual Conference on Human and Language Technology
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• 2020.10a
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• pp.317-320
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• 2020

연설문은 구어체와 문어체 두 가지 특성을 모두 갖고 있는 복합적인 데이터 형태이다. 발화자의 문장 표현, 배열, 그리고 결합에 따라 그 구조가 다르기 때문에, 화자 별 갖는 문체적 특성 또한 모두 다르다. 국정을 다루는 정치인들의 연설문은 국정 현황을 포함한 다양한 주요 문제점을 다룬다. 그러면 발화자의 문서 내 문체적 특성을 고려할 경우, 해당 문서가 어느 정치인의 연설문인지 파악 할 수 있는가? 본 연구에서는 대한민국 정책 브리핑 사이트로부터 한국어 기반 사전 학습된 언어 모델을 활용하여 연설문에 대한 미세조정을 진행함으로써 발화자 예측 분류 모델을 생성하고, 그 가능성을 입증하고자 한다. 본 연구는 5-cross validation으로 모델 성능을 평가하였고 KoBERT, KoGPT2 모델에서 각각 90.22%, 84.41% 정확도를 보였다.

• The Journal of Korean Association of Computer Education
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• v.9 no.5
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• pp.31-39
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• 2006

The change into the knowledge based information society requires a transformation of educational paradigm. Accordingly, intelligent learning and distance education are attracting a fair amount of attention. To apply the instructional learning method in this field, we need to consider a individualization of learning, as it were, abstraction of fact and path through learning, which is based on learner's traits, this focus entails a argument for individualized reasoning strategy. Therefore, in this paper, we design a learner's cognitive union, which is based on X-Neuronet(eXtended Neuronet), represent learner's hierarchical knowledge is able to self-learn, and grows adaptive union by proprietor. Additionally, we propose a individualized reasoning strategy, which relies upon learner's cognitive union, and verify the validity.

• Journal of the Microelectronics and Packaging Society
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• v.7 no.1
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• pp.1-5
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• 2000

Co-fired resistors for high frequency MCM-C (Multi Chip Module-Cofired) were fabricated and measured their RF properties from DC to 6 GHz. LTCC (Low Temperature Co-fired Ceramics) substrates with 8 layers were used as the substrates. Resisters and electrodes were printed on the 7th layer and connected to the top layer by via holes. Deviation from DC resistance of the resistors was resulted from the resister pastes, resistor size, and via length. From the experimental results, the suitable equivalent circuit model was adopted with resistor, transmission line, capacitor, and inductor. The characteristic impedance $Z_{o}$ of the transmission line from the equivalent circuit can explain the RF behavior of the buried resistor according to the structural variation.