• Journal of the Korean Society of Radiology
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• v.81 no.5
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• pp.1038-1052
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• 2020

Advancements of medical care with the use of new medical technologies have been promoting public health, but they can also place a financial burden on individuals and the country. Since the introduction of the health insurance system in 1977, the South Korean government has been attempting to control medical expenses. Radiological examinations have been a major target for cost reduction. Meanwhile, the radiological report fee has been combined with the technical fee for a long time; hence, its value has not been independently evaluated, and was also decreased proportionally with examination cost reduction. However, in the revised medical fee estimation system for MRI, the report fee has begun to be calculated separately from the technical fee, significantly contributing to the evaluation of the radiologists' work value. In conclusion, radiologists need to know and actively participate in the process of determining the insurance cost of radiological examinations and reports to get a proper value of their professionalism.

• Journal of the Korea institute for structural maintenance and inspection
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• v.26 no.6
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• pp.47-53
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• 2022

As the limit state design method is applied as a method of designing concrete structures, the ultimate state is considered in the analysis or design. In fact, when the reinforced concrete member bears tensile force, the force is transmitted from the rebar to the concrete, and the structure bears the tensile force to the ultimate state even after yield. Therefore, the accurate evaluation of behavior after yield, it is necessary to study the tension stiffening effect after yield of the flexural member. In this study, a 4-point bending test was conducted on the RC simple beam having a rectangular cross section of the double reinforcement, and the behavior of the member was analyzed in detail using the image analysis method. Using the analysis results, the estimation formula for the tension stiffening effect after yield was proposed, and the applicability of this was verified through the experimental results of existing study. The difference between the ultimate strain and the yield strain representing the ductile behavior of the member is similar to the experimental results. The prediction of the proposed formula is relatively accurate.

• Proceedings of the KSRS Conference
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• 2007.03a
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• pp.262-266
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• 2007

조간대의 생물상과 조류로는 조간대 내의 모래나 펄을 구성하는 입자의 크기와 조성에 의하여 많은 영향을 받는다. 이런 조류로의 특성을 파악하기 위하여 전통적으로 현장조사를 실시하였으나 이 방법은 짧은 조간대의 노출시간 동안 넓은 조간대 지역을 파악하기 힘든 단점이 있다. 이러한 단점을 극복하기 위하여 최근 국내외적으로 위성자료와 현장조사롤 통해 조간대내의 조류로 발달을 연구하는 노력이 활발히 진행 중 이다. 본 연구에서는 프랙탈 이론을 적용하여 발달양상이 다른 두 지역의 조류로의 발달정도를 정량적인 값으로 나타내었다. 본 연구에서는 강화도 남단 조간대에 대하여 IKONOS 영상에서 조류로를 추출한 뒤, 프랙탈 분석방법 중 2차원 분석에 많이 사용되는 box counting 방법을 적용하여 프랙탈 차원을 구하였다. 분석 결과, 강화도 남단 조간대 전체 지역에 대한 프랙탈 차원 값은 약 1.31 로 나타났다. 조류로의 지선이 단순하며 남북으로 수직방향으로 발달한 지역은 프랙탈 차원 값이 $1.0563{\sim}1.0672$로 나타났으며，조류로의 지선이 발달하고 매우 복잡한 형태를 보이는 곳은 프랙탈 차원 값이 $1.255{\sim}1.3016$로 나타나는 것을 알 수 있었다. 실제 해안선과 같은 곡선의 경우 프랙탈 차원 값이 $1.1{\sim}1.3$ 정도 나타나는데 본 연구에서 얻어진 프랙탈 차원 값을 보면 매우 흡사하게 나온 것을 알 수가 있다. 또한， 양상이 다른 두 지역의 프랙탈 차원 값이 약 0.2 정도 차이를 나타내는 것을 알 수가 있다. 이 결과는 영상에서의 조류로 발달의 복잡성에 대한 구분을 뒷받침 할 수 있을 것으로 생각한다.

• Smart Media Journal
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• v.12 no.1
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• pp.92-101
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• 2023

The importance of high-definition video has increased by increase in consumer demand for realistic content. Therefore, this study presented the UHD strategy of terrestrial broadcasters for global competitiveness. First, as a practical strategy, to secure domestic market, it should secure an ecosystem through cooperation among departments, create synergy, and prioritize the UHD field to gain global competitiveness with close cooperation with expertised countries in the field. Also, after securing the domestic market by developing UHDTV focusing on cost-effectiveness on socio-cultural situation of Korea, it should utilize the finance and technology for global market. government should support global competitiveness as a control tower, strengthening global content, composing a long-term roadmap, supporting related materials, and creating and exporting our own UHDTV model

• The Journal of the Korea institute of electronic communication sciences
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• v.19 no.1
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• pp.327-334
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• 2024

In this paper, we developed a system with a near-infrared LED light source with a wavelength of 950nm to acquire palm vein images and a white LED light source to acquire palm creases based on Raspberry Pi. In addition, we implemented a unique pattern-extractable image processing technology that can prevent counterfeiting and enhance security of mixed creases and palmprints through image pre-processing (Gray scaling, Histogram Equalization, Blurring, Thresholding, Thinning) for the acquired vein and palm images, and secured a source technology that can be used in a security-enhanced system.

• Journal of the Korean BIBLIA Society for library and Information Science
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• v.29 no.1
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• pp.325-344
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• 2018

Since the year 2000, the need for an improvement of archival descriptions has been an increasing issue, due to the growing usage and amount of archival materials. Unlike the development of descriptions for paper records, however, the technological development and research for moving image descriptions has been limited due to its diversity and specificity. This research investigated the current status and the specificity of the moving image descriptions and also examined major international archival description cases. In-depth interviews with archival professionals were also conducted. Based on the findings, this study suggested the need for redefinition of and continuous research on the fundamental values of moving image information, moving image description and management based on digilog view points, the development of user-centric description and search aides, the creation of moving image values using a relevant information management system, and the improvement of moving image description elements throughout the life-cycle of the material.

• Journal of the Korean Society of Radiology
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• v.17 no.1
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• pp.157-165
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• 2023

Ultrasound imaging uses sound waves of frequencies to cause physical actions such as reflection, absorption, refraction, and transmission at the edge between different tissues. Improvement is needed because there is a lot of noise due to the characteristics of the data generated from the ultrasound equipment, and it is difficult to grasp the shape of the tissue to be actually observed because the edge is vague. The edge enhancement method is used as a method to solve the case where the edge surface looks clumped due to a decrease in image quality. In this paper, as a method to strengthen the interface, the quality improvement was confirmed by strengthening the interface, which is the high-frequency part, in each image using an unsharpening mask and high boost. The mask filtering used for each image was evaluated by measuring PSNR and SNR. Abdominal, head, heart, liver, kidney, breast, and fetal images were obtained from Philips epiq5g and affiniti70g and Alpinion E-cube 15 ultrasound equipment. The program used to implement the algorithm was implemented with MATLAB R2022a of MathWorks. The unsharpening and high-boost mask array size was set to 3*3, and the laplacian filter, a spatial filter used to create outline-enhanced images, was applied equally to both masks. ImageJ program was used for quantitative evaluation of image quality. As a result of applying the mask filter to various ultrasound images, the subjective image quality showed that the overall contour lines of the image were clearly visible when unsharpening and high-boost mask were applied to the original image. When comparing the quantitative image quality, the image quality of the image to which the unsharpening mask and the high boost mask were applied was evaluated higher than that of the original image. In the portal vein, head, gallbladder, and kidney images, the SNR, PSNR, RMSE and MAE of the image to which the high-boost mask was applied were measured to be high. Conversely, for images of the heart, breast, and fetus, SNR, PSNR, RMSE and MAE values were measured as images with the unsharpening mask applied. It is thought that using the optimal mask according to the image will help to improve the image quality, and the contour information was provided to improve the image quality.

• Journal of Service Research and Studies
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• v.8 no.4
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• pp.31-51
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• 2018

The objective of this study is to suggest the measures for providing the personalized recommendation service, by analyzing the effects of personalized recommendation service of OTT service on the relationship strength and customer loyalty, and also to verify the differences in meanings of personalized recommendation service in accordance with the type of contents. In the results of this study, the personalized recommendation service has significant effects on the customer loyalty with the mediation of relationship strength, and in accordance with the type of contents mainly used by customers, there are differences in the effects of personalized recommendation service on the customers. Personalized recommendation service could be used as a tool for strengthening the relationship by inducing the commitment, which could improve the customer loyalty. When the contents have more active communications with customers, personalized recommendation service could largely contribute to the improvement of loyalty.

• Journal of the Institute of Electronics Engineers of Korea CI
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• v.41 no.6
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• pp.101-109
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• 2004

This paper proposes an adaptive watermarking algerian technique concerning the visual characteristics of human. To embed watermark to an image, features such as contrast, brightness, and texture are used. The propose method adaptively select blocks and determine the position and intensity of watermark to be applied, concerning the visual characteristics of a human. The experiment involves cropping, image enhancement, low pass filtering, and JPEG compression, which are compared on detectability of watermark against image manipulation and attack

• Proceedings of the Korean Association of Geographic Inforamtion Studies Conference
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• 2003.04a
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• pp.135-138
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• 2003

레이더 interferometry 기법을 이용하여 1995년 12월 11일과 12일에 획득된 ERS-1(orbit: 23180, frame 2853), ERS-2(orbit: 03507, frame: 2853) tandem 자료로부터 서해안(강화도-아산만) 지역의 조간대 DEM을 추출하였다. 사용된 SAR 자료는 영상획득 당시의 낮은 조위(ERS-1: 0.89 cm, ERS-2: -0.02 cm), 짧은 시간 간격(1일), 그리고 비교적 긴 기선 간격(270 m 수직 baseline)을 갖기 때문에 조간대 DEM 추출에 매우 적합하였다. 비록 추출된 DEM의 정확도 평가는 수행되지 않았지만 기존에 광학영상으로부터 추출된 남양만 지역의 waterline과 시각적으로 단순 비교될 수 있었다. 보다 정밀한 정확도 평가는 본 연구에서 사용한 자료와 같은 날 획득된 곰소만 지역의 자료(frame: 2886)를 사용하여 waterline 방법으로 추출된 DEM 및 현장 측량자료를 이용하여 수행될 것이다. Temporal 그리고 baseline decorrelation 등을 무시하고 SAR 영상의 위상측정 오차만을 이용하여 계산된 고도 정밀도는 SNR 20 dB에서 약 0.57 m이다.