• 한국정보통신학회논문지
• /
• 제7권4호
• /
• pp.630-637
• /
• 2003

본 논문에서는 디지털 데이터의 저작권 보호와 무단 복제 방지를 위해 기존의 M-sequence 대신 카오스 시퀀스를 이용한 새로운 워터마킹 방법에 대하여 제안한다. 강인성과 보안성은 워터마킹 처리에 있어 중요한 요소이다. 디지털 영상을 웨이브렛 변환한 후 각 부대역의 계수값들을 인간의 시각 체계를 고려한 다중 임계값으로 분류하고 카오스 시퀀스와 삽입할 워터마크 영상 그리고 랜덤 발생기로 생성된 다중 워터마크 가중치를 이용하여 워터마크 영상을 삽입하였다. 워터마크 검출은 웨이브렛 변환된 각 부대역간의 차신호를 이용하여 검출하였으며 여러가지 가능한 공격에 대해 성능 실험을 하였다. 카오스 시퀀스는 생성하기가 매우 쉬우며, 초기 값에 따라 전혀 다른 시퀀스를 생성하므로 M-sequence에 비해 보안성(security)면에서 더욱 안전하다는 장점을 갖고 있다.

• 자연과학논문집
• /
• 제5권2호
• /
• pp.33-38
• /
• 1992

텍스처럴 리전의 러프니스와 사람의 시각 시스템의 특성에 기초하여 세크멘테이션을 수행하는, 멀티미디어 텔레컨퍼런스를 위한 새로운 텍스처 세그멘테이션-베이스 영상 코우딩 기술을 제안한다. 세그멘테이션은, 텍스처의 영역이, 지각된 콘스탄트 인텐시티와 스무드 텍스처 및 러프 텍스처의 세가지 텍스처 클래스로 분류되도록 프랙탈 디멘전을 쓰레쉬호울딩하여 이루어진다. 각 세그먼트 바운더리와 각 텍스처 클래스를 위한 효과적인 코우딩 기술을 개발하여 높은 압축률과 좋은 영상 품질을 갖는 영상 코우딩 시스템을 달성하고, 이 기술의 코우딩 효율을 잘 확립된 기술 (디스크릿 코사인 트랜스폼(DCT) 영상 코우딩)의 코우딩 효율과 비교한다.

• 디지털콘텐츠학회 논문지
• /
• 제16권2호
• /
• pp.257-262
• /
• 2015

최근 무선 네트워크의 확산, 모바일 기기의 성능 향상, 서비스에 대한 수요 증가와 함께 모바일 지리 정보서비스에 대한 관심이 높아지고 있다. 기존의 유선 환경기반의 지리 정보 시스템 솔루션으로 무선 환경에서 서비스를 하기 에는 제한된 통신 속도, 처리 속도, 화면 사이즈 등의 한계점이 존재한다. 본 논문에서는 이와 같은 문제를 해결하기 위하여 클라이언트 측의 캐시 알고리즘을 제안하고자 한다. 제안된 알고리즘은 단위 시간과 공간 근접성의 개념을 이용하여 기존의 연구를 개선한다. 그리고 효율성의 향상 정도를 측정하기 위해 성능 평가를 실시하고 결과를 분석한다. 성능 평가 결과, 공간 데이터의 질의 시에 기존의 알고리즘에 비하여 적중률에 있어서 보다 좋은 성능을 나타내었다.

• 대한기계학회논문집A
• /
• 제29권10호
• /
• pp.1353-1360
• /
• 2005

Injection-molded products serve a wide range of applications in our modem lives and their significance is ever increasing. However, difficulty of communication among related companies under the present system results in increase of lead time and decrease of production efficiency. The objective of this paper is the development of a web-based draft verification system in mold design processes. Although several commercial CAD systems offer draft verification functions, those systems are very expensive and inadequate to perform collaborative works. For collaborative work under the distributed environment, the proposed system uses native file transforming of CAD data into optimal format by using the ACIS kernel and InterOp. Functions of draft verification modules are constructed over the ActiveX control using the visual C++ and OpenGL. Therefore, collaborators related to the development of a new product are able to verify the draft and undercut over the Internet without commercial CAD systems. The system helps to reduce production cost, errors and lead-time to the market. Performance of the system is confirmed through various case studies.

• 제어로봇시스템학회논문지
• /
• 제19권12호
• /
• pp.1067-1071
• /
• 2013

A 3D visual sensing method using a laser structured beam is presented for robotic tracking applications in a simple and reliable manner. A cylindrical shaped laser structured beam is proposed to measure the pose and position of the target surface. When the proposed laser beam intersects on the surface along the target trajectory, an elliptic pattern is generated. Its ellipse parameters can be induced mathematically by the geometrical relationship of the sensor coordinate and target coordinate. The depth and orientation of the target surface are directly determined by the ellipse parameters. In particular, two discontinuous points on the ellipse pattern, induced by seam trajectory, indicate mathematically the 3D direction for robotic tracking. To investigate the performance of this method, experiments with a 6 axis robot system are conducted on two different types of seam trajectories. The results show that this method is very suitable for robot seam tracking applications due to its excellence in accuracy and efficiency.

• Journal of Biosystems Engineering
• /
• 제26권5호
• /
• pp.481-486
• /
• 2001

To increase the production efficiency in dairy industry, proper artificial insemination is the most important operation. For the successful artificial insemination, accurate estrus detection is required. The Korean dairy farmers usually depended on visual observation for estrus detection of cows. Mounting behaviour is one of major inidications observed when cows are at an estrus. A mounting activity detection system for cows using radiotelemetry was developed. This system included a transmitter with a pressure switch, a receiver, a serial communication interface, a personal computer and a computer software. All components and a whole system were tested both in a laboratory and in a farm. The results of this study are as follows: 1. All components including transmitter, receiver and serial interface were operated according to the design specification. 2. A whole system tested with simulated mounting activity of 400 times showed 100% of success rate. 3. In the farm test for 4 days with three cows expecting estrus, one cows experiencing mounting activities showed correct response with this system. However two cows did not show mounting activities because of weak estrus and cold weather during the testing period.

• KSII Transactions on Internet and Information Systems (TIIS)
• /
• 제13권2호
• /
• pp.810-831
• /
• 2019

Recently, continuous dimensional emotion recognition from audiovisual clues has attracted increasing attention in both theory and in practice. The large amount of data involved in the recognition processing decreases the efficiency of most bimodal information fusion algorithms. A novel algorithm, namely the incomplete Cholesky decomposition based kernel cross factor analysis (ICDKCFA), is presented and employed for continuous dimensional audiovisual emotion recognition, in this paper. After the ICDKCFA feature transformation, two basic fusion strategies, namely feature-level fusion and decision-level fusion, are explored to combine the transformed visual and audio features for emotion recognition. Finally, extensive experiments are conducted to evaluate the ICDKCFA approach on the AVEC 2016 Multimodal Affect Recognition Sub-Challenge dataset. The experimental results show that the ICDKCFA method has a higher speed than the original kernel cross factor analysis with the comparable performance. Moreover, the ICDKCFA method achieves a better performance than other common information fusion methods, such as the Canonical correlation analysis, kernel canonical correlation analysis and cross-modal factor analysis based fusion methods.

• 한국정보통신학회논문지
• /
• 제22권5호
• /
• pp.764-771
• /
• 2018

연구는 인포그래픽 표현의 다양화와 전달 효율성을 시각적 조형성을 중심으로 파악하는 기초연구로, 조형적 특성에 중점을 두었다. 이를 위해 기하학적 유형과 유희적 유형으로 구분하여 각각의 조형적 속성들을 도출하여 유의미한 차이가 있음을 증명하였고 인포그래픽의 유형별 조형성과 내용전달의 상호 관계성을 분석하였다. 그 결과 기하학적 유형은 규칙성, 명확성, 시인성, 내용전달성이, 유희적 유형은 유희성, 시인성, 명확성, 내용전달성의 속성이 도출되었다. 또한 내용전달을 중심으로 나머지 속성의 관계를 분석한 결과, 기하학적 유형에서는 규칙성과 시인성이 내용전달 효과에 유의미한 긍정적인 영향력을 주고 있으며 유희적 유형에서는 유희성과 명확성이 내용전달에 유의미한 영향을 주는 것으로 나타났다. 따라서 인포그래픽의 조형성은 시각화 과정에서의 유의미한 차이에 의해 표현 유형을 구분하며 내용전달의 영향을 주는 세부 요인 또한 조형적 요소에 있음을 실증적으로 확인하였다.

• 한국실내디자인학회논문집
• /
• 제22권1호
• /
• pp.47-54
• /
• 2013

For the office work environmental design, the importance of the design management is increased to improve operation efficiency as well as the aesthetic environmental implementation of the function today. Lighting is a required element ineffective operation environment. It has become more important for the aesthetic, economic, and practical reasons, to consider the luminous environment and the lighting of visual tasks separately. When the brightness is insufficient, productivity deteriorates, and the layout of the lighting located by mistake causes the fatigue of eyes. Productivity rises to office in a large number of studies so as satisfaction is low in general in the dark office, and to be bright. Therefore the purpose of this research is to suggest the right direction of lighting design of office building area. 11newly renovated office buildings are selected for this luminous environment research. We could conclusions as following through this research. First, it was planned brighter than the recommended lighting level in the most space. It shows that the accurate lighting design criteria is needed in order to achieve proper lighting environment. Second, the application of the LED lighting fixtures is continuously increased in the recent office lighting environment. It is explained that it is applied for reasons of the electrical energy reduction and the maintenance efficiency with the long life time. Third, the consideration of the lighting plan for the difference of working types is not enough. with various communication configuration through an independent plan, and the effective lighting plan that appropriateness preparation design and energy saving area vailable must be applied. Fourth, the lighting environment of the lobby needs a specialized lighting plan as are presentative space of the building.

• 한국의류학회지
• /
• 제42권4호
• /
• pp.671-688
• /
• 2018

This study investigates the characteristics of VR stores that emerged as new fashion communication media. Two case studies on Hyundai and eBay VR Department stores were conducted along with a discussion of the function and meaning of the fashion VR store. The results showed that both stores provide novel shopping experiences; however, the two were differentiated in terms of production method and technology implementation level. Functional aspects such as providing shopping efficiency and purchasing service was insufficient in both stores. Instead, they were complementing by means of product rotation, recommendation system, voice guidance, or linkage with an online shopping mall. In experiential aspects, both stores provided a strong sense of immersion. Hyundai VR store enhanced immersion with a high resolution image of a real offline store; however, it lacked in the ability to provide multisensory stimulation such as kinetic sense or auditory stimulation. The eBay VR Department store intensified the immersion experience by providing auditory stimulation as well as visual stimulation that enhanced the speed and distance sense through the utilization of animation. However, the extent of experience was limited in terms of agency and transformation because of the low interactivity found in both store systems.