• Journal of Korea Game Society
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• v.14 no.5
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• pp.43-52
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• 2014

The direction of the Korea Game Forum is to check on the nature of games and to create a positive ecosystem of the game industry. And it would also be to promote the public understanding of the cultural and artistic values of games so as to promote the good effects image, and to induce supporting policies of the government, which will strengthen the global competitiveness of the game industry. Thereby the Forum would contribute to the establishment of the government policies on game industry, and lead the positive game manufacturing climate, which will induce the spreading of good game movement in the industry.

• The Journal of the Korean dental association
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• v.55 no.3
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• pp.230-239
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• 2017

Root coverage can be an efficacious treatment not only in aspect of dental symptoms like root caries and hypersensitivity, but also in aspect of esthetic problem. There are several predictable methods for gaining a connective tissue attachment to an exposed root surface. Among them, this case report will deal with three cases using enamel matrix derivative and connective tissue graft to recover esthetic and physiological periodontal environment and its form. This case report deals with three patients with gingival recession which has occurred by different causes. They were treated with de-epithelialized graft accompanied by application of enamel matrix derivative. 6-12 months later, all three patients showed considerable root coverage and clinically stable condition of healing. In conclusion, within the limitation of this study, de-epithelialized connective tissue graft accompanied by application of enamel matrix derivative shows stable and clinical acceptable results in aspect of root coverage.

• Speech Sciences
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• v.14 no.3
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• pp.139-146
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• 2007

This study attempted to obtain differences as a function of Korean and Chinese in vowels. The $NasalView^{(R}}$ (Tiger Electronics Inc., Seattle, USA) was used to obtain nasalance values. Ninety eight subjects participated in this study (48 females from Korea and 48 females from China). The stimuli used in this experiment included vowel /i, a, u/. The stimuli were presented in a random order. The entire session was recorded and the average nasalance score was measured via the $NasalView^{(R)}$. The procedure took approximately 10 minutes. The results of this study showed that the difference between Korean and Chinese was significant in vowel /i, a, u/. The average nasalance scores were /i, a, u/ from highest to lowest in order in vowels. The average nasalance was higher in China than Korean in vowels.

• Proceedings of the IEEK Conference
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• 2003.11c
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• pp.15-19
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• 2003

In this paper, the bit error rate (BER) performance of the fast frequency hopping/M-ary frequency shift keying system using the clipper receiver is analyzed by using the characteristic function (CF) technique in the presence of n=1 band multitone jamming and additive white Gaussian noise environment. The CFs of the clipper receiver outputs are derived as a infinite series representation using Gamma function and Marcum's Q -function. The analytical results are validated with various simulation results. Performance comparisons with linear combining receiver are shown that the BER performance of the clipper receiver is much better than that of the linear combining receiver In addition, as the clipping level approaches to infinity, it is shown that the clipper receiver simply performs a linear combining without clipping and there exists an optimum value of diversity level (the number of hops per symbol) that maximizes the worst case BER performance of the clipper receiver.

• Journal of the Korean housing association
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• v.25 no.4
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• pp.73-82
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• 2014

This study is to grasp the vulnerable families selected by the laws and qualification criteria on housing reformation and repair project of the Ministry of Land, Transportation and Maritime Affairs, the procedures of housing improvement projects, and the roles of superintendents, focusing on rural living and housing environment improvement. After the regional characters, housing style and structure of the recipients (the selected vulnerable families), and construction companies were closely examined by items and year, the results and problems of housing reformation and repair were diagnosed, compared and analyzed. On the basis of the results, the overall guidelines and directions of housing environment improvement for vulnerable families were suggested. Hopefully, these suggestions will be helpful for the kind of project in the future.

• Proceedings of the KIPE Conference
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• 2019.11a
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• pp.31-33
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• 2019

본 논문에서는 고주파 변압기 대신 무선 전력 전송 시스템을 적용해 양방향 전력 전송을 가능케 해주는 loosely coupled dual-active-bridge 컨버터에서, 코일 간 전송 효율을 높이기 위한 코일 형상 설계에 관한 연구를 진행하였다. 유한 요소법을 통해 여러 형태의 페라이트 코어에 대해 해석했다. 페라이트 코어 형태가 I-자 일 때 가장 높은 quality factor의 코일을 얻을 수 있었다. 또한, I-core의 ferrite plate의 크기에 따라 무선 전력 전송의 효율을 결정하는 코일의 coupling coefficient와 코일의 quality factor가 변하고 trade-off 관계가 있음을 확인하였다. 3cm의 air-gap에 대해 최대 효율을 가지는 코일 형상을 설계하여 시뮬레이션을 통해 97.8%의 코일간 전송효율을 얻었다.

• Proceedings of the KIPE Conference
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• 2019.11a
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• pp.114-115
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• 2019

이 논문은 무선 전력 전송을 이용하는 마우스의 급전 패드와 리시버 설계 방법을 제안한다. 마우스의 급전 패드는 코일의 턴간 간격을 불균등하게 조절하여 균일한 자기장을 급전 패드 상에서 얻게 하며, 집전코일은 급전코일과 비교해 크기가 작기 때문에 낮은 결합계수와 품질계수를 가져 원하는 전압을 얻기 어려운데 이를 위해 PCB 코일을 멀티레이어로 제작하고 PCB 패턴의 폭을 조절하여 높은 인덕턴스를 갖게 설계한 후 유한요소해석을 통해 설계한 시스템을 시험했다.

• The KIPS Transactions:PartB
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• v.16B no.2
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• pp.117-122
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• 2009

We developed a multi-lingual namecard recognizer for building up a global client management systems. At first, we created the Unicode-based character image database for character recognition and learning of multi languages, and applied many color image processing techniques to get more correct data for namecard images which were acquired by various input devices. And by applying multi-layer perceptron neural network, individual character recognition applied for language types, and post-processing utilizing keyword databases made for individual languages, we increased a recognition rate for multi-lingual namecards.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2015.11a
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• pp.41-42
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• 2015

본 논문에서는 다수 1 차 사용자가 다수 존재하고 2 차 사용자들이 다중 홉 통신을 하는 스펙트럼 공유 방식 무선 인지 네트워크를 분석한다. 다수의 1 차 사용자로부터의 간섭신호를 고려하여 각 2 차 사용자에서의 수신 신호대간섭잡음비를 분석하고 이를 바탕으로 2 차 사용자 네트워크의 불능확률을 구한다. 모의실험을 통해 1 차 사용자의 수가 감소함에 따라 불능확률이 감소한다는 것을 확인하였다.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2015.11a
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• pp.13-15
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• 2015

본 논문에서는 하나의 중계기가 하나의 송신기로부터 신호를 받아 증폭한 후에 수신기로 재전송하는 방식으로 송신기와 수신기 사이의 통신을 돕는 네트워크를 고려하였다. 중계기가 독자적인 에너지원이 없는 경우 일정한 양을 에너지를 확보하여 중계에 사용하기 위해서 송신기로부터의 신호를 에너지로 하베스팅하는 모델을 생각하였다. 또한, 나아가 현재의 다양한 무선통신 네트워크에서 사용중인 적응변조를 적용하여 항상 일정이상의 비트오율을 만족할 수 있는 더욱 현실적인 모델이 되도록 하였다. 이러한 모델에서 정해진 만큼의 시간을 하베스팅에 사용했을 경우 처리율을 구하였으며, 나아가 그 시간을 최적화하여 유도한 처리율을 최대화하는 문제를 만들었다.