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얼굴 특징점 자동 추출 오류에 강인한 3차원 얼굴 복원 방법
이연주(Youn Joo Lee),이성주(Sung Joo Lee),박강령(Kang Ryoung Park),김재희(Jaihie Kim) 大韓電子工學會 2011 電子工學會論文誌-SP (Signal processing) Vol.48 No.1
최근에 널리 사용되고 있는 단일 영상 기반의 3차원 얼굴 복원 방법인 변형 가능한 3차원 얼굴 형상 모델(3D morphable shape model)은 입력 영상으로부터 2차원 얼굴 특징점들을 정확하게 추출할 경우, 입력 얼굴과 유사한 3차원 얼굴 형상을 생성할 수 있다. 그러나 실시간 3차원 얼굴 복원 시스템과 같이 사용자의 협조가 불가능한 경우에는 자동으로 얼굴 특징점들을 추출해야 하기 때문에, 특징점 추출 오류가 발생하여 정확한 3차원 얼굴 형상을 생성하기 어려운 문제가 있다. 이러한 문제를 해결하기 위해서, 본 논문에서는 특징점 추출 시 오추출 특징점과 정추출 특징점을 자동으로 분류하고, 정추출 특징점들만을 이용하여 3차원 얼굴을 복원하는 방법을 제안하였다. 실험결과에서는 특징점 자동 추출 오류를 고려하지 않은 기존 방법과 비교한 결과, 제안방법의 3차원 얼굴 복원 성능이 크게 향상되었음을 확인하였다. A widely used single image-based 3D face reconstruction method, 3D morphable shape model, reconstructs an accurate 3D facial shape when 2D facial feature points are correctly extracted from an input face image. However, in the case that a user's cooperation is not available such as a real-time 3D face reconstruction system, this method can be vulnerable to the errors of automatic facial feature point extraction. In order to solve this problem, we automatically classify extracted facial feature points into two groups, erroneous and correct ones, and then reconstruct a 3D facial shape by using only the correctly extracted facial feature points. The experimental results showed that the 3D reconstruction performance of the proposed method was remarkably improved compared to that of the previous method which does not consider the errors of automatic facial feature point extraction.
참조가격제: 주요 국가의 사례 및 정책적 함의 -독일, 호주, 캐나다, 뉴질랜드, 노르웨이를 중심으로
이연주 ( Youn Joo Lee ),박지현 ( Ji Hyun Park ),신현호 ( Hyun Ho Shin ),고수경 ( Su Kyoung Ko ) 한국사회보장학회 2013 사회보장연구 Vol.29 No.4
우리나라에서는 지난 몇 년간 건강보험 재정안정화를 위해 다양한 정책적 변화를 시도하였으며, 이러한 약제비 규제 정책은 앞으로도 지속적으로 유지될 것으로 보인다. 참조가격제는 이미 여러 국가에서 운영되고 있는 제도 중 하나로 종종 국내 도입에 대한 논의가 이루어지는 제도 중 하나이다. 이러한 배경 하에서 본 연구는 주요국 참조가격제의 구체적인 내용을 고찰하고 이를 통해 정책적 함의를 찾고자 하였다. 각국 정부는 급격히 증가하는 약제비를 관리하기 위해 참조가격제를 도입하였고, 많은 국가에서 단기적으로 재정절감 효과를 보이기도 하였다. 하지만 재정절감에 대한 장기적인 효과에 대해서는 다른 견해가 존재하였다. 일부에서는 원하는 정책적 목적을 달성하지 못하고 참조가격제를 폐지하거나, 단순히 보험자가 부담했던 약제비의 일부가 환자에게 전가되는 현상이 나타나기도 하였다. 참조가격제의 도입이 우리나라 시장에서 어떤 방식으로 작동할 수 있을지에 대해 더많은 논의가 필요하다. 참조가격제를 포함한 새로운 약가 제도의 도입 논의에 앞서 모든 이해당사자들간에 충분한 의견 수렴과 사회적 합의를 이루어 향후 정책 결정에 고려하여야 한다. Many cost-containment measures have been introduced in Korea to stabilize increasing pharmaceutical expenditure. Recent changes, such as a government-mandate price cut for generics and off-patent products in Korea, can be viewed as a stepping stone for a new policy such as reference pricing. The purpose of this study is to understand reference pricing in other countries and draw implication for Korea. A literature review was conducted on MEDLINE and EMBASE using ‘reference pricing’ and ‘reference price’ as keywords. We reviewed studies according to the established criteria. A hand search was conducted to include broader categories of studies and reports related to reference pricing. Reference pricing was adopted in many countries in order to control rapidly growing pharmaceutical expenditure. The system evolved differently over many years among markets depending on the healthcare system and pricing policies. In terms of market response, reference pricing had a huge impact on both the prescription behavior and price level in many countries. However, overall savings seemed to be moderate so the payers eventually came up with more comprehensive cost-containment policies either in addition to reference pricing or following the abolishment of it. Considerable portion of cost savings came from increased patient co-payments in some countries. It is unclear to tell whether the reference pricing system will be able to yield much savings to the government if it is introduced in Korea. More researches on the system`s implication to the stakeholders should be conducted to further study the effects of the system.
이연주(Youn Joo Lee),박강령(Kang Ryoung Park),김재희(Jaihie Kim) 대한전자공학회 2007 대한전자공학회 학술대회 Vol.2007 No.7
In this paper, we propose a fuzzy vault system using iris data. The fuzzy vault, proposed by Juels and Sudan, has been used to protect cryptographic key with biometric information. In order to combine the fuzzy vault scheme with iris data, we used iris features extracted by ICA method and clustering technique. From our experimental results, we proved that the propose fuzzy vault system is robust to sensed environmental change.
퍼지볼트(Fuzzy Vault)에 적용하기 위한 Random Projection 기반의 홍채 특징 추출에 관한 연구
이연주(Youn Joo Lee),박강령(Kang Ryoung Park),김재희(Jaihie Kim) 대한전자공학회 2007 대한전자공학회 학술대회 Vol.2007 No.11
Fuzzy vault is a cryptographic method that encrypt and decrypt a secret data with a key, which may contain some errors. So this method is suitable for combining with biometric data. In order to use biometric information as a key of fuzzy vault, there are three requirements. In this paper, we present the three requirements and propose iris feature extraction method based on random projection in order to apply for fuzzy vault.
실시간 에지 컴퓨팅을 위한 RGB와 LWIR 영상 융합 기반 강물 영상 분할
황준영(Jun Young Hwang),박지원(Ji Won Park),이연주(Youn Joo Lee),정호기(Ho Gi Jung),서재규(Jae Kyu Suhr) 대한전자공학회 2023 대한전자공학회 학술대회 Vol.2023 No.11
Recent research has focused heavily on semantic segmentation using only RGB images. However, in adverse weather conditions, such as nights with low light or heavy rain obscuring most objects, the performance of artificial intelligence models can significantly deteriorate. For example, when a model trained solely on RGB images attempts to detect a river under circumstances involving nighttime and rain, it is highly likely to yield poor results. Therefore, this paper proposes a solution by training models robust to such situations through sensor fusion of long-wave infrared (LWIR) images and RGB images.
어린이집 학부모로서의 어머니 역할인식 및 아버지 자녀양육 참여인식과 역할수행
이연주,정영숙 충북대학교 교육 ·생활연구소 생활과학연구센터 2002 생활과학연구논총 Vol.5 No.-
The purpose of this study was to explore the effect of maternal role and father's care participation perceived by mother on maternal enactment in day care center. Subjects of this study were 284 mothers of three to seven-year-old children. The method of this study was questionnaire which was composed of socio demographics, role perception and enactment. Maternal role perception and enactment were measured by self-development, academic guidance, support, arbitration and make-decisions. The results of this study were as follows. 1. Mother perceived highly the importance of role, but their actual enactment were moderate. 2. There were significant differences in maternal role perception of involvement according to the mother's native place and the level of family income. There were significant difference in maternal role enactment according to the level of family income and the style of day care center. 3. The maternal role enactment was different significantly in maternal perception on father's care participation. That is, the maternal role enactment has appeared to be high when maternal perception on father's care participation is high. 4. There was relationship between maternal role perception and enactment. That is, the maternal role enactment appears to be high when maternal role perception is high.