• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.26 no.11
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• pp.951-959
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• 2015

Ground radiation antenna in mobile devices is becoming an issue for satisfying both miniaturization and high performance. Ground radiation antenna controls the characteristic mode of the ground plane and couples this mode with the ground radiation antenna, thereby having good radiation performance. In this paper, the characteristic mode theory and applications of ground radiation antenna will be introduced. The operating mechanism of single band, wideband and dual-band ground radiation antennas are studied.

• Proceedings of the Korean Society of Computer Information Conference
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• 2018.07a
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• pp.104-105
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• 2018

현재 국내 e스포츠 시장 규모와 사용자들이 지속적으로 증가되고 있는 시점에서 배틀그라운드라는 게임이 e스포츠 시장에 진입하였다. 배틀그라운드가 현재 e스포츠에 끼치고 있는 영향이 크지만, 좋은 반응을 유도하지 못하고 있다. 본 논문에서는 좋지 않은 평을 받고 있는 배틀그라운드의 e스포츠화와 과거의 스타크래프트, LOL(리그오브레전드)과는 달리 배틀그라운드가 흥행하지 못하는 이유와, e스포츠에 적합한지를 연구하고, 차선책을 제안한다.

• The Proceeding of the Korean Institute of Electromagnetic Engineering and Science
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• v.16 no.4 s.56
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• pp.38-47
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• 2005

최근 개인 무선통신 기술의 발달과 모바일화로 인해 안테나의 소형화가 요구되어 왔다. 소형화 과정에서 안테나가 가지고 있는 본질적인 특성(이득, 대역폭, 다이버시티 등)은 유지되기를 희망하고 있다. 이를 위해 소형 안테나의 그라운드 면이 또 다른 안테나 방사체임을 이용하여 안테나의 고유 특성의 열화를 조절할 수 있겠다. 본문에서는 소형 안테나의 그라운드 크기가 안테나의 특성에 미치는 영향을 분석하고, 최적의 그라운드 조건을 제시한다.

• Geophysics and Geophysical Exploration
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• v.26 no.2
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• pp.37-51
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• 2023

The ground roll is the most common coherent noise in land seismic data and has an amplitude much larger than the reflection event we usually want to obtain. Therefore, ground roll suppression is a crucial step in seismic data processing. Several techniques, such as f-k filtering and curvelet transform, have been developed to suppress the ground roll. However, the existing methods still require improvements in suppression performance and efficiency. Various studies on the suppression of ground roll in seismic data have recently been conducted using deep learning methods developed for image processing. In this paper, we introduce three models (DnCNN (De-noiseCNN), pix2pix, and CycleGAN), based on convolutional neural network (CNN) or conditional generative adversarial network (cGAN), for ground roll suppression and explain them in detail through numerical examples. Common shot gathers from the same field were divided into training and test datasets to compare the algorithms. We trained the models using the training data and evaluated their performances using the test data. When training these models with field data, ground roll removed data are required; therefore, the ground roll is suppressed by f-k filtering and used as the ground-truth data. To evaluate the performance of the deep learning models and compare the training results, we utilized quantitative indicators such as the correlation coefficient and structural similarity index measure (SSIM) based on the similarity to the ground-truth data. The DnCNN model exhibited the best performance, and we confirmed that other models could also be applied to suppress the ground roll.

• The KIPS Transactions:PartB
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• v.14B no.1 s.111
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• pp.1-4
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• 2007

In this paper, we propose an efficient scheme for automatically detecting highlight scenes in soccer videos. Highlights are defined as shooting scenes and goal scenes. Through the analysis of soccer videos, we notice that most of highlight scenes are shown around the goal post area. It is also noticed that the TV camera zooms in a setter player or spectators after the highlight stones. Detection of highlight scenes for soccer videos consists of three steps. The first step is the extraction of the playing field using a statistical threshold. The second step is the detection of goal posts. In the final step, we detect a zooming of a soccer player or spectators by using connected component labeling of non-playing field. In order to evaluate the performance of our method, the precision and the recall are computed. Experimental results have shown the effectiveness of the proposed method, with 95.2% precision and 85.4% recall.

• Cartoon and Animation Studies
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• s.28
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• pp.55-78
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• 2012

Underground comics is a trend of comics started by reflecting hippie culture in the 1960's. It reflects hippie culture proclaiming return to nature and denying war with no humanity and social systems of material civilization expresses anti-culture in a radical and humorous way. Robert Crumb adds the features of hippie culture to comics aggressively with issuing comic book, series. Especially received great response from hippie. It became the chance for underground comics to improve further. includes works like 'Whiteman' expressing the hidden desire of conservative middle class or 'Keep on truckin' describing youths in hippie culture as characters lording it over somebody, strutting confidently across various landscape. The Comic was published and distributed independently and character-driven comic that reflected the variety of hippie culture. The Comic represented the characteristics of the underground comics very well. Winding lines and points, a strong contrast, were used for excellent graphical effect. These comics escaped from heroic comics of the era and played great roles in opening an era of underground comics which express satires of social culture more freely.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.30 no.5
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• pp.333-338
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• 2019

In this study, we introduce a dual-band ground radiation antenna using an endless metal-rim mode control method that operates in the WLAN band. In the proposed antenna, the metal-rim modes are excited as one- and two-wavelength-mode radiators by a dual-band ground radiation antenna, which occupies a small space on the ground plane. The metal rim surrounds the ground plane with a gap of only 2 mm. In addition, two capacitors are inserted between the ground plane and the endless metal rim to control the one- and two-wavelength modes of the endless metal rim. Based on simulation and measurement results, we noted that the proposed antenna has an impressively high radiation performance.

• Geophysics and Geophysical Exploration
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• v.22 no.4
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• pp.177-185
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• 2019

Ground roll is a surface wave which is usually observed in the land seismic data. It is one of the typical coherent noise. During the reflection data processing, ground roll is removed because it is considered as noise. This removal process often causes the loss of reflection signals if the ground roll overlaps reflection signals. In this study, we look over Karhunen-Loeve Transform (KLT) and analyze its effects to suppress the ground roll appropriately while reducing the reflection loss. Numerical tests in homogeneous elastic media show that the ground roll has been properly rejected. However, the field data application reveals that there is no significant suppression of ground roll when compared to band-pass filtering. This can be considered that it is hard to calculate horizontally aligned gathers in the field data because the ground roll contains a wide range of frequency bands. On the contrary, the result of singular value decomposition (SVD) filtering shows that the ground roll has been significantly reduced. It is thought that the SVD filtering performs better in the ground roll suppression than KLT because it is easy to calculate the horizontally aligned gathers in the SVD filtering.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2017.10a
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• pp.443-446
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• 2017

1인칭 슈팅 게임(FPS) 장르는 오래 전부터 우리 게이머들의 사랑을 받아 왔다. 특히 2016년에는 오버워치가 그리고 2017년에는 아직 정식 출시도 하지 않은 배틀그라운드가 게임 시장에서 돌풍을 일으켜 현재 PC방 점유율에서 2, 3위를 기록하고 있다. 같은 FPS 라도 실은 우리 게이머에게 가장 익숙한 밀리터리 형 FPS에 비해 오버워치와 배틀그라운드는 서로 다른 형식을 갖고 있으며 이에 따라 전투의 방식과 게임의 목표, 무기 및 스킬의 활용도에서 여러 가지 차별성을 보이고 있다. 이에 본 논문은 전통적 밀리터리 형 게임으로 10년 역사를 가진 아바(A.V.A.) 온라인 게임을 선정하고 이것과 오버워치, 배틀그라운드 3자 간 전투 방식과 무기, 스킬 등의 차이를 비교 분석하여 성공적인 FPS 게임 흥행의 이유를 밝혀 보고자 하였다.

• Proceedings of the IEEK Conference
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• 2003.07b
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• pp.1145-1148
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• 2003

SSN을 줄이기 위해 벌크단의 그라운드와 소스단의 그라운드를 분리한다. 이 방법을 사용하면 소스과 벌크의 전압 차이가 발생하는데 소스에 발생되는 전압은 기생인덕턴스로 인해 노이즈 전압이되고 벌크의 전압은 그라운드에 바로 연결되기 때문에 0V가 된다. 이 방법을 사용하면 소스단에 기생인덕턴스가 벌크단에 미치지 못하게 되어 노이즈를 줄일 수 있다.. 본 논문에서 나타난 결과는 공통그라운드를 사용한 구동 드라이버 보다 SSN을 10% 간단히 줄일수 있다.