• Proceedings of the IEEK Conference
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• 2001.09a
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• pp.967-970
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• 2001

본 논문에서는 적응 필터의 계수 갱신에서 가변 블록을 사용하는 방법을 제안하였다. 데이터 블록의 길이는 MSE 학습곡선의 시정수에 비례하도록 하였다. 이 방법에서는 적응 필터가 정상상태로 접근함에 따라 스텝사이즈를 조정하여 필터계수 갱신의 횟수를 줄일 수 있다. 제안한 방법의 유용성을 입증하기 위한 컴퓨터모의 실험을 통해 기존의 최적 스텝사이즈 수열을 이용한 알고리듬과 가변 스텝사이즈 알고리듬과 성능을 비교하였다. 그리고 MSE 의 초기값을 최소화하는 최적 초기 스텝사이즈를 유도하였다. 유도된 최적 스텝사이즈를 가변 스텝사이즈 알고리듬에 적용, 그 성능을 평가 하였다.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2015.07a
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• pp.460-463
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• 2015

본 논문에서는 인간의 시각 인지 특성 중 하나인 돌출영역(saliency region) 응시 특성을 고려한 LCD 디스플레이의 백라이트 제어 방법을 제안한다. 제안된 방법은 입력 영상의 화소 분포를 분석하고 주된 응시 영역 검출 결과를 가중치 함수로 이용하여 영역별로 분할된 영상의 블록에 대응하는 백라이트를 증폭 혹은 감소시킨다. 소비전력의 증가 없는 백라이트 블록별 증폭 기법 구현을 위하여 백라이트 증폭 총량은 백라이트 감소 총량으로 제한하고 블록 별로 증폭 양 결정을 위하여 MPEG2 TM-5 Rate Control 모델을 도입하여 적응적 백라이트 레벨 결정 방식을 적용하였다. 백라이트 증폭 시뮬레이션 결과를 바탕으로 제안된 방법이 소비전력 증가 없이 인간 시각이 주로 응시하는 돌출 영역의 화질을 개선함을 보였다.

• Proceedings of the Korean Society of Computer Information Conference
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• 2023.07a
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• pp.671-672
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• 2023

블록체인 기술을 통한 정확하고 투명한 데이터관리의 장점을 학습 시스템에 적용하는 사례가 증가하고 있으며 이에 따라 학습자 만족도와 참여율을 높이기 위한 학습데이터의 효율적 관리가 필요하다. 원격학습에서 학습 연계성과 만족도는 학습자의 학습참여율과 학습에서의 만족도에 변할 수 있음을 감안하여 당 변수에서 기인하는 하이퍼파라미터를 조정하여 학습자의 학습패턴과 학습연속성을 높이기 위한 노력을 하였다. 본 논문에서 제안하는 알고리즘을 적용하여 학습자 만족도를 조사한 결과, 적용 전 대비 10% 이상 학습 만족도 및 학습연계 의향률이 높아짐을 확인할 수 있다.

• Journal of the Korea Society of Computer and Information
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• v.25 no.5
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• pp.217-227
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• 2020

In this paper, I propose that what factors affect logistics companies' adoption of blockchain technology and to analyze the effects of blockchain technology on logistics performance. The variables influencing the adoption of blockchain technology were presented based on the TOE frame. Expected profit, organizational readiness, technology compatibility, and competitive pressure were suggested as factors to adopt blockchain technology. Also, as a blockchain technology, smart contracts and information transparency were presented. Logistics performance suggested agility and alignment. A survey was conducted with Korean logistics companies. Looking at the results of analyzing the collected data, it was found that expected profit and technology compatibility have a positive effect on this blockchain technology (smart contract, information transparency). Organizational readiness was found to have a positive effect on information transparency. Blockchain technology was found to have a positive effect on logistics performance.

• The Inventors News
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• no.17
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• pp.3-4
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• 2003

기능성 보도 블록, 특허 출원 증가 - 한$\cdot$중$\cdot$일, 3국간 특허협력 본격 추진 - SK텔레콤 스피드 010 상표등록 추진 - LG전자, 미국서 세탁기 특허침해 피소 - 올해 가장 쿨한 발명품 - `반도체배치설계 공모전` 시상식 개최 - 한국 기술경쟁력 세계6위 - 특허청 분쟁조정위원회 유명무실 - 북한 특허등록 대행변리사 등장

• Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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• v.23 no.1
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• pp.59-67
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• 2005

This paper proposes method for determining exterior orientation parameters (EOPs) from the RPC mathematical camera model of the satellite image. SPOT satellite stereo pair is pre-tested using the proposed method. As results that, geopositioning errors are similar with those of the original EOPs. Differences between EOPs determined from the RPC and original EOPs were small. IKONOS Geo-level stereo pair is tested by the proposed method. Results of this method are compared with those of the RPC block adjustment method which have been verified in reported studies. Consequently, the proposed method showed accuracy similar to the RPC block adjustment method. The digital elevation models (DEMs) of sample area acquired by the two method almost did not have a difference.

• Journal of Satellite, Information and Communications
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• v.12 no.1
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• pp.13-17
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• 2017

This paper presents an approach to enable a typical GPS receiver to be much less susceptible to intentional disruption such as jamming and change in link environment. In order for the GPS receiver to cope with jamming and to get adaptivity, a $4{\times}4$ beamforming antenna is designed using metamaterials. The design results show the antenna gain much higher than 5 dBi and the movable beam.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.20 no.9
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• pp.1-6
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• 2019

One method for image recognition is template matching. In conventional template matching, the block matching algorithm (BMA) is performed while changing the two-dimensional translational displacement of the template within a given matching image. The template size and shape do not change during the BMA. Since only two-dimensional translational displacement is considered, the success rate decreases if the size and direction of the object do not match in the template and the matching image. In this paper, a variable is added to adjust the two-dimensional direction and size of the template, and the optimal value of the variable is automatically calculated in the block corresponding to each two-dimensional translational displacement. Using the calculated optimal value, the template is automatically transformed into an optimal template for each block. The matching error value of each block is then calculated based on the automatically deformed template. Therefore, a more stable result can be obtained for the difference in direction and size. For ease of use, this study focuses on designing the algorithm in a closed form that does not require additional information beyond the template image, such as distance information.

• Journal of Korean Society for Geospatial Information Science
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• v.10 no.3 s.21
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• pp.29-40
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• 2002

In photogrammetry, the accuracy is analyzed by using the coordinate of the targeted position determined by the geometric principle, thus, the reliability depends on the accuracy of the coordinate of the targeted position. Thereby, geographic surveying is essential to perform such tasks, and it requires approximately $30{\sim}50%$ of total cost and times to produce a finalized map. The main purpose of this study is to determine the configuration of the disposition of minimum datum points and their configuration, which were determined by surveying values available through using the structure of block model based on the aerotriangulation. ortho projection image was produce and digital topographic map was achieved by the optima model(CASE7). We also performed comparative analysis about the result of local datum point and the accuracy of overlapping based on the surveying results. Consequently, it is possible to analyze the unknown position accurately with the optimal model., CASE 7, which is the minimum datum points configuration required to block adjustment. Furthermore, this optimal model, which provides the minimum datum points, results costs and time saving effects compared to the previous methodology.

• Journal of the Korean Vacuum Society
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• v.16 no.1
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• pp.46-51
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• 2007

The HFMX((High Flux Macromolecular X-ray crystallography) beamline at Pohang Accelerator Laboratory uses beams from a multi-pole wiggler. Two horizontal and vertical slits relevant to high heat-load are installed at its front-end. In order to treat high heat-load with reducing beam scattering, the horizontal slit has two Glidcop blocks with a grazing incidence angle of $10^{\circ}$ of a grazing-incidence knife-edge configuration. The blocks adjust the slit gap by being translated along guides by two actuating bars, respectively. Water flowing through holes, drilled along the actuating bars, cools the heat-load of both blocks. The vortical slit has the same structure as the horizontal slit except its installation direction with respect to the vacuum chamber and its grazing incidence angle. By virtue of a pair of blocks translating on guides, no alignment between both blocks is required and the installed slits show stable operating performance. The cooling performance of the two slits has been also shown to be acceptable. In this paper, the detailed explanation for the design of the two slits is presented and their operating performance is discussed.