• Journal of Broadcast Engineering
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• v.21 no.1
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• pp.51-59
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• 2016

This paper presents a method of DCT-based illuminant compensation to enhance the accuracy of face recognition under an illuminant change. The basis of the proposed method is that the illuminant is generally located in low-frequency components in the DCT domain. Therefore, the effect of the illuminant can be compensated by controlling the low-frequency components. Moreover, a directional high-order local pattern descriptor is used to detect robust features in the case of face motion. Experiments confirm the performance of the proposed algorithm got up to 95% when tested using a real database.

• Journal of the Korean Society for Railway
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• v.15 no.4
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• pp.357-363
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• 2012

This paper presents a new operation method for the single phase PWM(Pulse Width Modulation) converter train. Recently, the trains adopting the PWM converter have become the majority in the electric locomotives since there are distinct advantages over the predecessors, which can be operated at near unity power factor. However, a slight modification of the control scheme makes this kind of vehicles run in the region of leading power factor. Although this feature seems to be of no significant use by itself, the leading phase operation can improve the voltage profile and the line loss of the feeding systems is decreased by compensating the reactive power loss along the line when it considered together with the feeding systems. This method is even more economical and efficient comparing with the installation of SVC that is mainly used for this purpose since the train can become a movable compensator. With the conditions and some essential formula for the leading phase operation, a new power factor control algorithm has been proposed to implement this scheme. The results of simulation through SIMULINK model show that the proposed method is suitable enough for practical use.

• Journal of Korea Game Society
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• v.11 no.6
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• pp.149-158
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• 2011

This study investigated the types and characteristics of arcade games that have marked the beginning of the game industry. Arcade game equipment have been largely evolved from 'mechanical arcade game equipment' to 'electro-mechanical arcade game equipment', and to 'video arcade game equipment' In these evolution processes, arcade games have had unique characteristics distinct from other game platforms. These characteristics included the properties of 'space' and 'time', 'original form of gameplay', 'simple interface' and 'performance feasibility.' The recent stagnation of arcade games was due to the fact that the characteristics of arcade games started to lose their unique characteristics since these were also spread to other platform of games.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.21 no.1
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• pp.1-16
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• 1996

In this paper, by combining the motion compensated transform coding with the sub-band decomposition technique, we present a motion compensated sub-band coding technique(MCSBC) for image sequence coding. Several problems related to the MCSBC, such as a scheme for motion compensation in each sub-band and the efficient VWL coding of the DCT coefficients in each sub-band are discussed. For an efficient coding, the motion estimation and compensation is performed only on the LL sub-band, but the discrete cosine transform(DCT) is employed to encode all sub-bands in our approach. Then, the transform coefficients in each sub-band are scanned in a different manner depending on the energy distributions in the DCT domain, and coded by using separate 2-D Huffman code tables, which are optimized to the probability distributions in the DCT domain, and coded by using separate 2-D Huffman code tables, which are optimized to the probability distribution of each sub-band. The performance of the proposed MCSBC technique is intensively examined by computer simulations on the HDTV image sequences. The simulation results reveal that the proposed MCSBC technique outperforms other coding techniques, especially the well-known motion compensated transform coding technique by about 1.5dB, in terms of the average peak signal to noise ratio.

• The Journal of The Korea Institute of Intelligent Transport Systems
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• v.5 no.2 s.10
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• pp.19-28
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• 2006

In the IEEE 802.15.4a system, they require simple, economical and low power consumption transmitter and receiver to transmit low rate data and to identify distance and location. To meet these requirements, LR-WPAN system use transmitter and receiver with simple modulation and demodulation scheme. In this paper, use PPM+BPSK modulation and windowing scheme to overcome multipath fading effect. Then we apply this channel estimation scheme to LR-WPAN system and compare performance depends on transmitter scheme. Proposed method using preamble to find channel characteristic out and we compensate distorted data with that information. Therefore we can detect signal easily at the demodulation part. Simulation result shows that performance evaluation is greater at the NLOS channel than LOS channel no matter what the receiver scheme.

• The Journal of the Acoustical Society of Korea
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• v.17 no.7
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• pp.42-49
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• 1998

본 논문에서는 전화망 환경에서 음성 인식 성능을 개선하기 위한 특징 벡터 추출 단계에서의 처리 방법들을 연구하였다. 먼저, 고립 단어 인식 시스템에서 채널 왜곡 보상 방 법들을 단어 모델과 문맥 독립 음소 모델에 대하여 인식 실험을 하였다. 켑스트럼 평균 차 감법, RASTA 처리, 켑스트럼-시간 행렬을 실험하였으며, 인식 모델에 따른 각 알고리즘의 성능을 비교하였다. 둘째로, 문맥 독립 음소 모델을 이용한 인식 시스템의 성능 향상을 위하 여 정적 특징 벡터에 대하여 주성분 분석 방법(principal component analysis)과 선형 판별 분석(linear discriminant analysis)과 같은 선형 변환 방법을 적용하여 분별력이 높은 벡터 공간으로 변환함으로써 인식 성능을 향상시켰다. 또한 선형 변환 방법을 켑스트럼 평균 차 감법과 결합하여 더욱 뛰어난 성능을 보여주었다.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2011.10a
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• pp.927-929
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• 2011

Since DVC (Distributed Video Coding) and FRUC (Frame Rate Up Conversion) techniques need to have an efficient motion compensated frame interpolation algorithms. Conventional works of these applications have mainly focused on the performance improvement of overall system. But, in some applications, it is necessary to evaluate how well the MCI (Motion Compensated Interpolation) frame matches the original frame. For this aim, this paper deals with the modeling methods for evaluating the block-based matching cost. First, several matching criteria, which have already been dealt with the motion compensated frame interpolation, are introduced and then combined to make estimate models for the size of MSE (Mean Square Error) noise of the MCI frame to original one. Through computer simulations, it is shown that the block-based cost evaluation models are tested and can be effectively used for estimating the MSE noise.

• 한국벤처창업학회:학술대회논문집
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• 2023.04a
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• pp.45-50
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• 2023

본 논문은 스타트업과 벤처기업의 임직원이 상장후 적법한 절차에 따라 스톡옵션 행사를 하였지만, 주식시장의 주가에 악영향을 미치며 일반투자자 피해가 발생하여 도덕적 해이 논란이 촉발되었고 이 문제에 대해 정부 규제당국이 직접적인 추가규제를 예정하고 있는 상황에서 주식매수선택권제도(Stock Option, 이하 스톡옵션)의 보완 수단인 양도제한조건부주식(Restricted Stock Unit, 이하 RSU)제도를 도입함으로써 시장중심적으로 이 문제를 풀어내는 선진 스타트업 벤처금융 방안을 제시하는 것이 목적이다. 이를 위해, 본 논문은 첫째, RSU의 개념에 대해 제한조건부주식(Restricted Stock, 이하 RS)와 비교논의를 통해 제시하며. RSU의 스톡옵션에 대한 보완적 특징 설명에서는 기존 스톡옵션제도와 RSU를 비교 설명하였다. 둘째, RSU의 단점과 한계점을 설명하고 그 한계점을 극복하며 국내 스타트업과 벤처기업들이 이를 효과적으로 도입 할 수 있는 방안을 제시하였다. 셋째, RSU의 도입 현황을 제시하며 향후 RSU 도입 위한 정책방안들을 제안하였다. 본 논문은 이를 통해 RSU가 기본 스톡옵션제도의 규제강화를 통한 시장 위축적인 해결보다는, 새로운 대안을 주식연계형 보상방안 대안을 제시함으로써 보다 시장친화적인 제도를 마련함으로써 국내 스타트업과 벤처기업의 인력수급 해소와 사업활성화에 큰 의미를 벤처생태계 스스로가 풀어내는데에 기여할 것으로 기대한다.

• Journal of Digital Convergence
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• v.16 no.3
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• pp.261-273
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• 2018

The purpose of this study is to find out how the online brand community characteristics affect customer behavior according to self-construal level and gender difference. The characteristics of online community are divided into interaction, objectivity, information provision, and activity reward. First, interactivity and activity compensation among the characteristics of online community have a positive effect on brand community commitment. On the other hand, the effect of purpose and information provision is insufficient. Second, the greater the commitment to the brand community, the higher the WOM effect is. Finally, this study shows that customers with dependent self-construal tendencies have more brand community support than customers with independent self-construal tendencies, and females show more brand community support than males. This study suggests an efficient marketing approach to companies through a brand community commitment by understanding the intrinsic motivation of consumers' self-construal level.

• The Journal of the Korea Contents Association
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• v.22 no.7
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• pp.202-215
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• 2022

The purpose of this study is to identify gamification techniques and characteristics of digital marketing based on the main information communication, learning, and play of the current consumer group, and to present effective gamification digital marketing plans for the MZ generation. The summary of the research process is as follows. First, the characteristics and definitions of MZ generation and gamification were described and the concept was clarified. Second, domestic and foreign gamification cases were compared and analyzed. Studies show that we should be wary of gamification digital marketing, which fails to reflect the characteristics of the fun-seeking MZ generation by failing to organically connect the mechanisms and structures of gamification, focusing only on visible elements, such as Point, Badge, and Leaderboard. In addition, customers who lose the fun of obtaining rewards and leave because they feel that the rewards (points, badges, leaderboards) they provide are worthless should be prevented.