• 대한전자공학회논문지SP
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• 제45권6호
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• pp.78-87
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• 2008

디지털 영상이 멀티미디어의 핵심 매체로 자리를 잡게 되면서 영상의 열화요인을 제거하여 원래의 품질에 가깝게 개선하는 영상 복원기술의 활용분야가 더욱 늘어나고 있다. 그러나 영상복원을 수행할 때 영상의 열화(degradation)가 선형공간불변이라고 가정하기 때문에 주파수영역에서 영상복원을 수행하면 그 결과 에지와 같이 밝기값의 변화가 큰 영역 주변에서 물결현상(ringing)이 나타나는 단점이 있다. 본 논문은 물결현상 제거를 위해 새로운 적응적 후처리 필터링 방법을 제안한다. 제안하는 알고리즘은 웨이블릿 변환을 사용하여 영상을 해석하고 에지 맵을 추출하고 영역을 나누어 에지영역과 물결현상을 검출한 후 이를 쌍방향필터(bilateral filter)를 이용해 제거한다. 실험결과를 통해서 제안하는 방법이 효과적으로 물결현상을 제거하는 동시에 중요한 에지를 보존할 수 있음을 확인할 수 있다.

• 한국임상보건과학회지
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• 제4권4호
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• pp.689-698
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• 2016

Purpose. This study was performed to evaluate the effects of a introduction of nursing and bioethics subject on nurse image and nursing professionalism of freshmen nursing students. Methods. Participants were 104 freshmen nursing students. The period of data collection was from March 3 to June 17, 2016. The research was done in a one group pretet-posttest for a quasi-experimental study. The data ware analyzed by frequencies and paired t-test using the SPSS 21.0 program. Results. The results are as followed : There were statistically significant differences among pre and post in the nurse image(t=-6.15, p<.001) and nursing professionalism(t=53.92, p<.001). Conclusions. We strongly recommend using introduction of nursing and bioethics subject to nurse image and nursing professionalism of freshmen nursing students. And, in future study, it is necessary to develop the curriculum and teaching strategies for improving nurse image and nursing professionalism.

• 대한의용생체공학회:의공학회지
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• 제6권2호
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• pp.29-32
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• 1985

We have developed a real time digital subtraction a giographic system(RTDSA) and specified it's performance characteristics. Our RTDSA has large-capacity frame memories and a post-processing computer which enables various advanced digital image processing techniques.

• 대한원격탐사학회지
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• 제38권6_1호
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• pp.1025-1034
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• 2022

본 논문에서는 건물의 포인트 클라우드를 추출할 때 발생하는 홀 영역의 보간을 통한 후처리 방안을 제안한다. 스테레오 영상 데이터에서 영상 매칭을 수행할 경우 차폐 및 건물 벽면 등의 영향으로 홀이 발생한다. 이런 영역은 추후 포인트 클라우드를 기반으로 하는 부가 산출물의 생성에 장애 요인이 될 수 있으므로, 이에 대한 효과적인 처리 기법의 적용이 필요하다. 먼저 영상 매칭을 적용하여 생성된 시차맵을 기반으로 초기 포인트 클라우드를 추출한다. 포인트 클라우드를 격자화 시키면 차폐영역 및 건물 벽면의 영향으로 발생하는 홀 영역을 확인할 수 있다. 홀 영역에 삼각망을 생성하고 삼각망 내부 값을 영역의 최소값으로 처리하는 과정을 반복하는 것으로 건물 주변의 지표면과 건물 간에 어색함 없는 보간의 수행이 가능하다. 격자화 된 데이터에서 보간 된 영역에 해당하는 위치정보를 포인트로 추가하여 새로운 포인트 클라우드를 생성한다. 보간과정 중 불필요한 점의 추가를 최소화하기 위해 초기 포인트 클라우드 영역에서 벗어나는 영역으로 보간 된 데이터는 처리하지 않았으며, 보간 된 포인트 클라우드에 적용되는 RGB 밝기값은 매칭에 사용된 스테레오 영상 중 촬영중심과 해당 픽셀이 가장 근접한 영상으로 설정하여 처리하였다. 실험 결과 제안 기법을 통해 대상영역의 포인트 클라우드 생성 후 발생하는 음영 영역이 효과적으로 처리되는 것을 확인할 수 있었다.

• Imaging Science in Dentistry
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• 제47권1호
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• pp.17-24
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• 2017

Purpose: The purpose of this study was to assess the accuracy, sensitivity, and specificity of the diagnosis of incipient furcation involvement with periapical radiography (PR) and 2 cone-beam computed tomography (CBCT) imaging protocols, and to test metal artifact interference. Materials and Methods: Mandibular second molars in 10 macerated pig mandibles were divided into those that showed no furcation involvement and those with lesions in the furcation area. Exams using PR and 2 different CBCT imaging protocols were performed with and without a metallic post. Each image was analyzed twice by 2 observers who rated the absence or presence of furcation involvement according to a 5-point scale. Receiver operating characteristic (ROC) curves were used to evaluate the accuracy, sensitivity, and specificity of the observations. Results: The accuracy of the CBCT imaging protocols ranged from 67.5% to 82.5% in the images obtained with a metallic post and from 72.5% to 80% in those without a metallic post. The accuracy of PR ranged from 37.5% to 55% in the images with a metallic post and from 42.5% to 62.5% in those without a metallic post. The area under the ROC curve values for the CBCT imaging protocols ranged from 0.813 to 0.802, and for PR ranged from 0.503 to 0.448. Conclusion: Both CBCT imaging protocols showed higher accuracy, sensitivity, and specificity than PR in the detection of incipient furcation involvement. Based on these results, CBCT may be considered a reliable tool for detecting incipient furcation involvement following a clinical periodontal exam, even in the presence of a metallic post.

• 복식
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• 제54권5호
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• pp.155-166
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• 2004

OP-Art was not appreciated by painters and art critics. and according1y has been forgotten in art history. But recently Op-Art is revitalized in fashion and is in its palmy days. This study intends to re-assess the value of Op-Art, by reviewing its influence on fashion design in the post-modern society To this purpose, conceptual characteristics of Op-Art was analyzed. And then, on the bases of these characteristics, the figural characteristics and the meaning of Op-Art in fashion design of post-modern society was re-explained. Op-Art is characterized as an art of flatness of picture plane which uses repetition of simple forms and colors. It is also based on trick of visual perception. Finally. it creates an impression which is flickering or vibrating by means of optical illusion. These characteristics give birth to some features such as simplicity. anonymity and mobility in the Op-Art fashion. The meanings of Op-Art in fashion design in post-modern society are as follows. First, repetition of simple units employed in Op-Art produces feeling of simplicity. which makes the Op-Art fashion works perceived as polysemy. In other words, the feeling of simplicity can be interpreted In diverse perspectives within the social context of our society. The material civilization and technology civilization, which causes the alienation and standardization of man. can be the backgrounds of the Op-Art fashion. Second, Op-Art is an art based on perspectives of spectators. Anonymity in the Op-Art fashion enhances participation of spectators. which gives Op-Art a sense of affinity. Third, through the feeling of mobility created by optical illusion techniques. the Op-Art fashion expresses the opposition to the ideal body image made by power group. In post-modern society, Op-Art in fashion gives new meaning to art. Op-Art in fashion proposes new roles of artist and spectators, and new concepts of art related with roles of human beings. Through general sensibility of men, Op-art in fashion can express new recognition of the post-modern society.

• ETRI Journal
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• 제35권3호
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• pp.448-458
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• 2013

This paper presents a generalized post-processing technique for enhancing the pseudorandomness of digital chaotic oscillators through a nonlinear XOR-based operation with rotation and feedback. The technique allows full utilization of the chaotic output as pseudorandom number generators and improves throughput without a significant area penalty. Digital design of a third-order chaotic system with maximum function nonlinearity is presented with verified chaotic dynamics. The proposed post-processing technique eliminates statistical degradation in all output bits, thus maximizing throughput compared to other processing techniques. Furthermore, the technique is applied to several fully digital chaotic oscillators with performance surpassing previously reported systems in the literature. The enhancement in the randomness is further examined in a simple image encryption application resulting in a better security performance. The system is verified through experiment on a Xilinx Virtex 4 FPGA with throughput up to 15.44 Gbit/s and logic utilization less than 0.84% for 32-bit implementations.

• 한국IT서비스학회지
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• 제13권4호
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• pp.1-17
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• 2014

Domestic and international energy and eco-friendly companies take advantage of social media for image enhancement and product promotion. However, there were no in-depth empirical analysis to verify specific effectiveness of social media use in these sectors. The purpose of this study is to reveal the key factors that are considered to use social media effectively for energy and eco-friendly companies. For this purpose, we regarded the effectiveness of social media as Post Awareness and Word of Mouth. Characteristics of social media as a medium were measured separately, media richness and media genre, as independent variables of social media effectiveness. We investigated 413 posts in Facebook brand page of energy and eco-friendly companies and conducted a content analysis. As a result, post awareness of users was greater when post has richer media such as video. For media genre, word of mouth appeared to be greater when the posts provide information.

• 한국인쇄학회지
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• 제27권1호
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• pp.107-118
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• 2009

The printing industry is getting more digitalized and integration. It has enabled the interactive information and networking from Pre-Press, Press, to the Post-Press. These are efficient management and the improved process and productivity are getting more important. Such trends improved in the functionality and automation. This paper tries to find out how technology for CIP3/4-based process may be applied and resolved. Such subject includes the domestic and international cases regarding each manufacturer's CIP3/4 technology types. Another purpose is to emphasize on the needs to establish the environment. Under this environment, it is possible to integrate network in exchangeable form through JDF standard format after CIP3/4. Based on the data from this study, it is expected to collect further substantial data which is related to the domestic printing company's CIP4 operation. It will be also possible to perform subsequent studies on the proper variables of the market segment. CIP4 stands for "International Cooperation for Integration of Prepress, Press and Post-press, it is an association of around forty international companies, mostly manufacturers of prepress, press and post-press, as well as suppliers and users. In this paper, we studied on the acting application of CIP4 workflow.

• Child Health Nursing Research
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• 제22권3호
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• pp.172-181
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• 2016

Purpose: This study was conducted to examine the effect of education on infection control for multidrug resistant organism (MDRO). Methods: One group pre-post time series design was used. Infection control education for MDRO infection was provided to nurses working in the Neonatal Intensive Care Unit (NICU). Knowledge and recognition were evaluated before and after education. Hand hygiene compliance, MDRO isolation rate and central line-associated bloodstream infection (CLABSI) rate were used as outcome variables. Data from 45 nurses was used for analysis. Results: General knowledge about MDRO increased (p=.011). Responses to questions about image of MDRO and MDRO management tended to change in a positive direction (p=.046). Hand hygiene compliance was 100% at pre-test, 79.5% during education period and 98.4% at post-education period. MDRO isolation rate was 6.83 per 1,000 patient days at pre-test, 10.24 during education period and 6.68 at post-education period. CLABSI rate was 3.76 per 1,000 central line days at pre-test, 6.84 during education period and 4.71 at post-education period. Conclusion: Findings indicate that the education program is effective in improving knowledge about MDRO in NICU nurses. However, more reliable indicators should be used to determine long-term effects.