• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2008.02a
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• pp.147-150
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• 2008

현재의 비디오 카메라는 인간의 눈으로 볼 수 있는 것과 동일한 화질의 비디오 영상을 얻을 수 없다. 인간의 눈은 움직이는 물체에 중점을 두고 초점을 맞추는 시각적 특성을 가진다. 하지만 현재의 비디오 카메라 시스템은 영상에 대한 인간의 눈의 시각적 특성에 대한 고려 없이 조리개와 렌즈의 조절 작업이 이루어진다. 본 논문은 이러한 비디오 카메라 시스템의 개선을 위해 인간의 눈의 시각적 특성에 기반을 둔 실시간 피사체 적응 비디오 카메라 시스템을 제안한다. 제안하는 알고리즘은 영상내에서 움직임을 가진 물체를 찾아낸 뒤, 이것에 가중치를 두고 조리개와 초점제어 작업의 순서로 이루어진다. 움직이는 물체는 영상 코덱의 움직임 정보를 파악하여 찾아내었다. 제안된 알고리즘은 프로그램언어로 구현되었으며, 초점거리와 조리개제어가 가능한 카메라와 PC를 사용하여 영상을 분석, 검증하였다.

• Korean Journal of Optics and Photonics
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• v.15 no.6
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• pp.583-590
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• 2004

The autofocus is one of the important processes in the automated vision inspection or measurements using optical microscopes, because it influences the measuring accuracy. In this paper, we used the confocal microscope configuration based on not a pinhole but a single-mode optical fiber. A single mode fiber has the functions of source and detector by applying the reciprocal scheme. As a result, we acquired a simple system configuration and easy alignment of the optical axis. Also, we embodied a fast autofocus system by acquiring the focus error signal through a source modulation technique. The source modulation technique can effectively reduce physical disturbances compared with objective lens modulation, and it is easily applicable to general optical microscopes. The focus error signal was measured with respect to the modulation amplitude, reflectance of the specimen and inclination angle of the measuring surface. The performance of the proposed autofocus system was verified through autofocusing flat mirror surface. In addition, we confirmed that source modulation rarely degrades the depth resolution by the comparison between the FWHMs of axial response curves.

• Knowledge Management Research
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• v.23 no.2
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• pp.193-210
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• 2022

The rapid development of mobile technology and the improvement of network speed are providing convenience to various services, and mobile shopping malls are no exception. Although efforts are being made to promote sales by combining various technologies such as customized recommendations using big data and specialized personalization services based on artificial intelligence, most mobile shopping malls have the same detailed page information structure including detailed product information. In this context, in this study, it was determined that the content layout of the product detail page and the mobile product detail page layout tailored to the consumer's preference should be presented according to the consumer's preference. Based on Higgins' Regulatory Focus Theory, a study of consumer propensity revealed that the content layout arrangement on a product detail page, when presented in an F-shape, informs the consumer that it is organized. If presented in a Z-shape, vivid information was recognized, and it was examined whether the product attitude and purchase intention were affected. As a result, when the content layout composition was presented as a layout arrangement in the form of a sense of unity and organization, prevention-focused consumers were positively affected by product attitudes and purchase intentions, and promotion-oriented consumers felt freedom. When presented in an arrangement, it was confirmed that the product attitude and purchase intention were affected.

• The Journal of Information Technology
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• v.7 no.2
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• pp.7-17
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• 2004

An academic performance can advance the expectations that lead to academic success. The purpose of this study was to research the relationship of the variables; past performance, the ability to use information technology, outcome expectations, grade goal of studies, and study performance in an information technology course. Participants completed a background questionnaire, the Information Technology Proficiency Exam, the scale of the ability using computer, and the Technology Outcome scale. Based on path model results, the findings suggest that students' academic performance is related to past performance. Consistent with theory, the findings suggest that the studies performance is influenced by ability using information technology via the establishment of the grade goal of studies. In the present study, the past performance variable failed to predict an academic studies performance when impacted by outcome expectations.

• Journal of the Korea society of information convergence
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• v.6 no.2
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• pp.51-55
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• 2013

The accomodation is made to see near objects. This accomodation have different characteristics from individual to individual. Difference also occurs accommodation of the theory and real. This is accomodative-lag. Depth of focus directly affects the accomodative-lag. Depth of focus is affected by the refractive power and the size of the pupil. Depth of focus becomes deeper as the size of the pupil is small, the refractive power is increased. The accomodative-lag occur more as depth of focus is deep. In this paper, a study was made of the relationship of the accomodative-lag and refractive power. A Monocular Estimation Method(MEM) use for measuring the accomodative-lag. Results were measured by MEM, it tended to increase the refractive power so as to increase the accodative-lag. The accomodative-lag amount was measured at 0.51D. Men were measured at 0.52D, women were measured at 0.49D. The accomodative-lag by gender tended also increases the amount of refractive power increases.

• Journal of the Korea Society for Simulation
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• v.17 no.4
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• pp.167-174
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• 2008

The introduction of confocal microscopy makes it possible to observe the structural change of live neuronal cell. Neuro-degenerative disease, such as Alzheimer;s and Parkinson’s diseases are especially related to the morphological change of dendrite spine. That’s the reason for the study of segmentation and extraction from confocal microscope image. The difficulty comes from uneven intensity distribution and blurred boundary. Therefore, the image processing technique which can overcome these problems and extract the structural information should be suggested. In this paper, we propose robust structural information extracting technique with confocal microscopy images of dendrite in brain neurons. First, we apply the nonlinear diffusion filtering that enhance the boundary recognition. Second, we segment region of interest using iterative threshold selection. Third, we perform skeletonization based on Fast Marching Method that extracts centerline and boundary for analysing segmented structure. The result of the proposed method has been less sensitive to noise and has not been affected by rough boundary condition. Using this method shows more accurate and objective results.

• Proceedings of the Korean Information Science Society Conference
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• 2003.10a
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• pp.154-156
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• 2003

인터넷의 급속한 성장과 더불어 많은 정보와 데이터들을 인터넷을 통하여 얻을 수 있게 되었으며 많은 단체들이 문서들을 웹을 통하여 이용 가능하게 만들고 있다. 이에 따라 다양한 정보와 데이터를 효과적으로 분류하고 검색하는 문서 분류 (Document Classification)에 대한 알고리즘이 다양한 분야에서 널리 연구되어 왔으며 본 논문에서 초점을 두고 있는 전자 도서관 (Digital Library) 분야에서도 활발히 연구되어지고 있다. 하지만 기존의 전자 도서관의 문서 분류 알고리즘들은 문서들의 각 단락의 비중을 고려하지 않은 채 단어들의 발생 빈도에 초점을 두어 많은 잡음 단어 (Noise Term)를 포함하고 그로 인하여 분류 성능이 떨어졌다. 본 논문에서는 문서 단락의 중요도에 따라 다른 .가중치를 부여하여 단어 지지도 (Term Support)가 높은 단어들을 추출하고 그 단어들로 연관 규칙 (Association Rules)을 이용하여 분류 규칙을 생성하는 방법을 제안한다. 제안된 방법의 성능평가를 위해 문서 분류에 널리 쓰이는 나이브 베이지안 분류자 (Na$\square$ve Bayesian Classifier) 및 기존의 단순 연관 규칙 분류자 (Associative Classifier)와 비교 평가하였다. 그 결과, 각 가중치가 부여된 연관 규칙 분류 방법이 나이브 베이지안 분류 방법과 단순 연관 규칙 분류 방법보다 높은 성능을 보였다.

• Korea Information Processing Society Review
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• v.11 no.4
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• pp.56-62
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• 2004

현재 각광받고 있는 텔레매틱스 서비스는 궁극적으로 움직이고 있는 자동차 내 공간을 대상으로 다양한 정보제공서비스를 구현하는 데 초점이 맞추어져 있다. 따라서 무엇보다도 핵심적인 정보는 실시간 교통정보로서 이를 통해 현재의 위치와 앞으로의 모바일 상태를 파악할 수 있게 된다. 이는 실제 텔레매틱스 서비스 수요자를 대상으로 한 수요조사에서도 가장 높은 만족도와 선호도를 나타내고 있다. (중략)

• The KIPS Transactions:PartB
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• v.14B no.6
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• pp.407-412
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• 2007

The performance of ultrasonic testing systems for industrial or medical purpose largely depends on the performance of ultrasonic transducers. Generally, the information about an ultrasonic transducer performance characteristics are expressed by the ultrasonic R/F signal back from a reflector and its frequency characteristics in the data sheet provided by manufacturers. In case of focused ultrasonic transducers, the two pieces of information can, however, hardly assure that the focused ultrasonic transducer would produce well-focused C-scan images. Therefore, we propose the measured size of focal spot and the reconstructed shape of effective focal zone in the focused sound field as novel measures for the performance evaluation of the focused ultrasonic transducers. The process of getting the both measures of the transducers is conducted by the implemented software including sound field scanning and virtual 3D reconstruction functions which requires the echo of a point reflector. The proposed method could, otherwise impossible in the existing method, effectively and simply distinguish superior ones among many transducers made in the same specification and be also used to detect the performance degradation due to the aging of the transducers. Eventually, the quality of performance of the ultrasonic testing systems for industrial or medical purpose is secured.

• 정보화사회
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• s.92
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• pp.21-24
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• 1995

새로운 문화가 등장하는 현 시점에서 간과해서는 안될 사항은 설사 새로운 환경이나 문화가 도래하더라도 기존의 질서는 절대 무시되어서는 안된다는 점이다. 윤리적인 문제나 정보시대의 새로운 법 질서에 대한 논의는 다음으로 미루고 기술적인 문제에 초점을 맞추어 보도록 하자.