• Journal of the Korea Computer Graphics Society
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• v.22 no.2
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• pp.11-19
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• 2016

This paper proposes a method to directly retarget facial motion capture data to the facial rig. Facial rig is an essential tool in the production pipeline, which allows helping the artist to create facial animation. The direct mapping method from the motion capture data to the facial rig provides great convenience because artists are already familiar with the use of a facial rig and the direct mapping produces the mapping results that are ready for the artist's follow-up editing process. However, mapping the motion data into a facial rig is not a trivial task because a facial rig typically has a variety of structures, and therefore it is hard to devise a generalized mapping method for various facial rigs. In this paper, we propose a data-driven approach to the robust mapping from motion capture data to an arbitary facial rig. The results show that our method is intuitive and leads to increased productivity in the creation of facial animation. We also show that our method can retarget the expression successfully to non-human characters which have a very different shape of face from that of human.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.32 no.1D
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• pp.33-39
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• 2012

More and more pavements are suffering from damage these days due to the below-zero winter temperatures and frequent snowfalls. From this research, the freeze-thawing mechanisms of pavements will be observed, and the freeze-thawing resistance of porous asphalt concrete mixture is to be evaluated according to various assessment methods. The investigation was conducted through applying rigid and flexible pavements to freeze-thawing resistance experiments, which include various experiments such as deformation rate measurements, Lottman tests, repeated cyclic freeze-thawing experiments, stripping resistance tests and so on. Test results revealed that the porous asphalt concrete had less deformations according to temperatures compared to dense-graded asphalt concrete due to the 20% void gap. In addition, according to the freeze-thawing repetition experiments which are effected by moisture, the porous asphalt concrete mixture showed superior resistance to repeated cyclic freeze-thawing compared to other asphalt concrete mixtures due to the drainage and the voids within the specimen.

• Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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• v.19 no.4
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• pp.373-383
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• 2001

This study conducted pilot mapping project to know the possibility of mapping with medium resolution satellite imageries. For this purpose, mapping experiments were conducted with each stereo model imageries of SPOT, KOMPSAT, and IRS- lC. And positional accuracy, analysis of detectable and describable features, and comparison with existing digital map were checked, possible mapping scale and cost analysis were conducted with these results. Regarding SPOT imagery, digital photogrammetric workstation was used for stereoplotting. Regarding KOMPSAT and IRS-lC imageries, because there were data format support problems. head-up digitizing was performed with ortho imageries rectified with DEMs generated by image matching. The results of experiments show that such features as wide road, river, coast line, etc are possible to detect and depict but many other features are not for SPOT, KOMPSAT, and IRS-lC imageries. On the aspect of mapping, therefore, SPOT is available for 1/50,000 topographic map revision, KOMPSAT and IRS-lC for 1/25.000 topographic map revision.

• Proceedings of the Korea Database Society Conference
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• 2002.10a
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• pp.51-59
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• 2002

오늘날 비즈니스의 가장 중요한 요소 중의 하나는 타이밍이며, 이의 예측 정확성이나 대응력에 따라 비즈니스의 성패 정도가 달라질 수 있다. 이러한 의사결정력을 강화하기 위해서 많은 기업에서는 글로벌 선도시장의 흐름이나 선진기업의 성공전략에 대한 벤치마킹을 수행한다. 모바일 산업에 관한 한 한국은 글로벌 선도시장으로, 한국의 휴대폰 시장 변천을 분석하고 구매요인 및 요인간 관계를 규명하여 지표화할 수 있으면 여타 국가에서 시장주도 전략에 중요한 역할을 수행할 수 있을 것으로 예상된다. 따라서 테크놀로지 수용에 대한 기존 문헌연구를 바탕으로 끊임없이 변화하는 정보기술 제품이나 서비스의 수용 여부 및 시장 성장 예측에 대한 프레임워크를 개발 제시하는 것이 본 연구의 기본 목적이다. 개인차원의 기술 수용 모형인 Technology Acceptance Model(TAM) 및 여러 수정모형에서 규명된 다양한 변수들은 실증적인 연구의 결과로서 중요성은 갖으나, 여전히 연구 및 실무 관점에서는 특정 상황에 대한 통계 분석 결과의 제시라는 점에서 한계를 갖는다. 비교 대상국으로 선택한 중국은 그 국토만큼, 인구만큼, 문화만큼 다양하고 복합적인 시장이며, 동시에 누구나 공감하는 거대한 잠재시장이므로, 한국시장의 분석을 바탕으로 중국시장에 대한 향후 성장을 지표로 예측할 수 있다면 국내 기술 및 상품 수출의 기회를 보다 더 수익성있게 포착할 수 있을 것이라고 판단했기 때문이다. 그러나 여기서는 연구의 의의, 대표적인 일부 변수의 평가와 연구방법에 대한 제안에 국한하여 설명한다.

• Proceedings of the Korea Information Processing Society Conference
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• 2010.11a
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• pp.917-920
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• 2010

Web 2.0 시대를 대표하는 핵심적인 컨텐츠는 단연 UCC이다. 사용자가 직접 만드는 컨텐츠를 의미하는 UCC는 유투브, 아프리카TV 등을 통하여 많은 수익을 거두며 관련 업계의 주목을 받고 있으나 복제와 수정, 전송이 쉬운 인터넷 환경에서 많은 저작권 문제를 내포하고 있다. 최근에는 웹을 중심으로 CCL을 통해 자신의 저작물에 대한 허용조건을 명시하여 다른 사용자에게 명시된 조건하에서 자유롭게 저작물을 이용할 수 있게 하는 방법이 널리 이용되고 있다. 그러나 CCL로 허용된 컨텐츠를 이용함에 있어서 CCL의 누락 및 위변조를 통해 저작물을 불법으로 이용하는 행위가 증가하고 있어 CCL 활성화의 장애물이 되고 있다. 또한 다양한 응용프로그램에 CCL을 적용하고 검증하기 위한 SW 플랫폼이 부재한 상태이다. 이에 본 논문에서는 효과적으로 컨텐츠에 CCL을 적용하고 CCL로 사용허가된 컨텐츠를 검증 할 수 있는 SW 플랫폼을 제안한다.

• Journal of Korea Multimedia Society
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• v.4 no.2
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• pp.97-107
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• 2001

In this paper, an illuminant estimation algorithm of a chromatic digital images proposed. The proposed illumination estimation method has two phases. First, the surface spectral reflectances are recovered. In this case, the surface spectral reflectances recovered are limited to the maximum highlight region (MHR) which is the most achromatic and highly bright region of an image after applying intermediate color constancy process using a modified gray world algorithm. Next, the surface reflectances of the maximum highlight region are estimated using the principal component analysis method along with a set of given Munsell samples. Second, the spectral distribution of reflected lights of MHR is selected from the spectral database. That is a color difference is compared between the reflected lights of the MHR and the spectral database that is the set of reflected lights built by the given Munsell samples and a set of illuminants. Then the closest colors from the spectral database are selected. Finally, the illuminant of an image can be calculated dividing the average spectral distributions of reflected lights of MHR by the average surface reflectances of the MHR. In order to evaluate the proposed algorithm, experiments with artificial and real captured color-biased scenes were performed and numerical comparison examined. The proposed method was effective in estimating the spectral of the given illuminant sunder various illuminants.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.49 no.3
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• pp.233-241
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• 2021

As increasing the feasibility of the eVTOL UAM(electric vertical take-off and landing urban air mobility), numerous corporations and laboratories are conducting researches. In the aircraft development process, estimating the cost of the aircraft is essential part in terms of budgeting and commercial viability analysis. However, it is difficult to predict the cost of an eVTOL UAM owing to various configurations and little open cost information. This paper presents a novel method to predict the vehicle cost of various eVTOL configurations by modifying previous studies of the aircraft cost estimation. A vehicle cost of Wisk Cora is calculated by the presented method as an example to illuminate the method. The method is indirectly validated by comparing the vehicle costs of six representative eVTOL aircraft with those from the UAM study reports.

• Korean Journal of Remote Sensing
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• v.30 no.2
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• pp.219-226
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• 2014

Fractional values resulted from the spectral mixture analysis could be used to classify not only urban area with various materials but also forest area in more detailed spatial scale. Especially South Korea is largely consist of mixed forest, so the spectral mixture analysis is suitable as a classification method. For the successful classification using spectral mixture analysis, extraction of optimal endmembers is prerequisite process. Though geometric endmember selection has been widely used, it is barely suitable for forest area. Therefore, in this study, we modified Iterative Error Analysis (IEA), one of the most famous algorithms of image endmember selection which extracts pure pixel directly from the image. The endmembers which represent deciduous and coniferous trees are automatically extracted. The experiments were implemented on two sites of Compact Airborne Spectrographic Imager (CASI) and classified forest area into two types. Accuracies of each classification results were 86% and 90%, which mean proposed algorithm effectively extracted proper endmembers. For the more accurate classification, another substances like forest gap should be considered.

• Journal of KIISE:Information Networking
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• v.35 no.2
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• pp.158-165
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• 2008

In this paper, we present a MMPR (Minimizing the Maximum Used Power Routing) Algorithm in a MANET (Mobile ad hoc network) by modifying the route selection algorithm in well-known routing MANET protocol. In the previous route selection algorithms, the metric for cost function is the minimal hop which does not consider the energy status. MMPR uses the metric with used energy The node that want to know the route for some destination begins calculating the route cost function with alpha which is the maximum used energy in the known route. If the new route that contains the node whose used energy is greater than previous known alpha is known to the node that want to send a packet in some moment, the probability of selecting the new route is lower. Experimental results with MMPR show higher performance in both the maximum used energy and the number of dead nodes than that of the CMMBCR (Conditional Max-Min Battery Routing).

• Journal of the Korea Academia-Industrial cooperation Society
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• v.12 no.10
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• pp.4561-4568
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• 2011

In this paper, carrier comparison PWM method for voltage control of Vienna rectifier is discussed. In general, in industrial and communications applications, the two-level rectifier is used. However, this two-level rectifier has the limit of high THD and low efficiency. So, the studies of three-level rectifier has been carried out so far, and the Vienna rectifier circuit is the representative. The space vector pulse width modulation(SVPWM) method is generally used for Vienna rectifier, in which voltage vectors and duration time are calculated from the voltage reference. However, this method require very sophisticated and complex calculations, so realizing this method by software is very difficult. To overcome this disadvantage, simple carrier comparison PWM method for Vienna rectifier is proposed which is modified from the carrier comparison method for 3 level inverter. Furthermore, to verify the usefulness of the Vienna rectifier carrier comparison PWM the simulation and experiment are carried out.