• 한국산학기술학회논문지
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• 제22권1호
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• pp.633-640
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• 2021

본 연구는 동영상 학습에서 텍스트와 이미지 제시방식이 학습자의 학습몰입, 학습만족, 학업성취에 미치는 차이를 분석하였다. 이때 텍스트 제시방식은 2~3단어로 구성된 짧은 문장형태와 키워드형태로 구분하였고, 이미지 제시방식은 상세정보와 관계정보를 모두 표현하는 이미지와 관계정보만을 표현하는 이미지로 구분하였다. 실험연구를 위해 중국 형태대학교 1학년 167명을 텍스트와 이미지 제시방식에 따른 4가지 유형의 동영상 집단에 무선배정한 후 학습하게 하였다. 분석하기 위해 SPSS 25.0을 사용하여 다변량분산분석(MANOVA)을 실시하였다. 연구결과, 짧은 문장형태로 텍스트가 제시된 동영상을 학습한 집단이 키워드 형태의 텍스트가 제시된 동영상을 학습한 집단보다 학습몰입, 학습만족, 학업성취가 통계적으로 유의하게 높았다. 둘째, 상세정보와 관계정보를 모두 표현하는 이미지가 제시된 동영상을 학습한 집단이 관계정보만 표현하는 이미지가 제시된 동영상을 학습한 집단보다 학습몰입, 학습만족, 학업성취가 통계적으로 유의하게 높았다. 짧은 문장형태의 텍스트와 관계정보만 표현한 이미지가 제시된 동영상을 학습한 집단의 종속변인 평균이 가장 높았다. 반면에, 키워드 형태의 텍스트와 관계정보만 표현한 이미지가 제시된 동영상을 학습한 집단의 종속변인 평균이 가장 낮았다. 이러한 결과는 교수자 내레이션이 포함된 동영상을 설계할 때 이미지와 텍스트의 제시할 때 시사점을 준다.

• KIEAE Journal
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• 제3권2호
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• pp.33-36
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• 2003

The influence of the visual information on the sound perception would be considerable. Furthermore, if the sound perception ranges in noisiness or annoyance beyond the loudness, it will depend much more on the shape of the visual information. This paper aims to estimate the influence of the several kinds of visual information on the perception of road traffic noise by means of the psycho-acoustic test method. The findings of present study on the influence of visual information on subjective noise perception are summarized as follows: Presenting visual images of mild and comfortable scenery reduced the noise perception reaction at the less noisy environments not exceeding 65 dB(A). At highly noisy environments exceeding 65 dB(A), however, the noise perception can be reduced by strong image of waterfall. Even eliminating the road traffic image may be helpful. Visual image of waterfall reduced the noise perception at all levels. It is inferred that the road traffic noise perception can be effectively ameliorated by presenting strong and real landscape images at any noisy environment.

• Journal of Sport and Applied Science
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• 제4권2호
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• pp.45-51
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• 2020

Purpose: The purpose of this study is to investigate how sports fans' loyalty is built via CSR activities of professional sports teams. Furthermore, the study sought to suggest the model presenting the process of developing loyalty of sport fans by teams' CSR performance. Research design, data, and methodology: For this purpose, a survey was conducted on 450 professional sports fans through the convenience sampling method. A total of 357 of the data were used for the final analysis. Based on the collected data, frequency analysis, reliability analysis, confirmatory factor analysis, and structural equation model analysis were conducted. Results: The results showed that CSR activities contribute to building a positive image of team. Regarding fan identification, team image has also a positive effect on enhancing identification. The finding has supported the notion that attitudinal loyalty is enhanced by fan identification and further attitudinal loyalty significantly influences behavioural loyalty of fans. Conclusions: The results of this study explored the function of CSR of the teams on attitudinal and behavioural outcomes, loyalty. Moreover, the study suggested the constructual model presenting its role on enhancing fans' attitudes and behaviour affecting participation and consumption. Academic and practical implications were discussed for sport marketers and practitioners.

• 대한전자공학회논문지SP
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• 제41권6호
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• pp.195-208
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• 2004

히스토그램은 여러 가지 응용적인 측면에서 매우 유용한 방법이며, 단순한 계산법과 편리성이 강조되면서, 오늘날 디지털 이미지 프로세싱에서는 기본적인 방법이 되었다. 하지만 히스토그램을 사용하는 방법의 근본적인 한계점은 영상에서 픽셀의 공간적인 위치 정보를 없애 버린다는 것이다. 본 논문은 공간적인 위치정보를 포함한 히스토그램(공간 히스토그램)을 제시하여 영상을 재해석한다. 또한 그 결과를 이용하여 레벨 순서별 Recursive 메디안 필터를 구현 하였다. 제안한 Recursive 메디안 필터는 기존의 Recursive 메디안 필터와 비교 했을 때, 에지 보존 측면에서 상당 부분 개선된 결과를 보였다.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제18권6호
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• pp.1619-1637
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• 2024

In today's highly digitized landscape, securing digital communication is paramount due to threats like hacking, unauthorized data access, and network policy violations. The response to these challenges has been the development of cryptography applications, though many existing techniques face issues of complexity, efficiency, and limitations. Notably, sophisticated intruders can easily discern encrypted data during transmission, casting doubt on overall security. In contrast to encryption, steganography offers the unique advantage of concealing data without easy detection, although it, too, grapples with challenges. The primary hurdles in image steganography revolve around the quality and payload capacity of the cover image, which are persistently compromised. This article introduces a pioneering approach that integrates image steganography and encryption, presenting the BitPatternStego method. This novel technique addresses prevalent issues in image steganography, such as stego-image quality and payload, by concealing secret data within image pixels with identical bit patterns as their characters. Consequently, concerns regarding the quality and payload capacity of steganographic images become obsolete. Moreover, the BitPatternStego method boasts the capability to generate millions of keys for the same secret message, offering a robust and versatile solution to the evolving landscape of digital security challenges.

• Journal of applied mathematics & informatics
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• 제18권1_2호
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• pp.621-637
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• 2005

A hybrid method solving regularized structured linear total least norm (RSTLN) problems, which have highly ill-conditioned coefficient matrix with special structures, is suggested and analyzed. This scheme combining RSTLN algorithm and separation by parts guarantees the convergence of parameters and has an advantages in reducing the residual norm and relative error of solutions. Computational tests for problems arisen in signal processing and image formation process confirm that the presenting method is effective for more accurate solutions to (R)STLN problem than the (R)STLN algorithm.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제13권2호
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• pp.1020-1042
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• 2019

Reversible data hiding in encrypted images (RDHEI) provides some real-time cloud applications; i.e. the cloud, acting as a data-hider, automatically embeds timestamp in the encrypted image uploaded by a content owner. Many existing methods of RDHEI only satisfy user privacy in which the data-hider does not know the original image, but leaks owner privacy in which the receiver can obtains the original image by decryption and extraction. In the literature, the method of Zhang et al. is the one providing weak content-owner privacy in which the content-owner and data-hider have to share a data-hiding key. In this paper, we take care of the stronger notion, called strong content-owner privacy, and achieve it by presenting a new reversible data hiding in encrypted images. In the proposed method, image decryption and message extraction are separately controlled by different types of keys, and thus such functionalities are decoupled to solve the privacy problem. At the technique level, the original image is segmented along a Hilbert filling curve. To keep image privacy, segments are transformed into an encrypted image by using random permutation. The encrypted image does not reveal significant information about the original one. Data embedment can be realized by using pixel histogram-style hiding, since this property, can be preserved before or after encryption. The proposed method is a modular method to compile some specific reversible data hiding to those in encrypted image with content owner privacy. Finally, our experimental results show that the image quality is 50.85dB when the averaged payload is 0.12bpp.

• 대한가정학회지
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• 제42권10호
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• pp.115-128
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• 2004

Social structure has diversified, and changed into the form of pluralism since entering the 21st century. Specially, entering in the 21st century modem fashion is expressed to the luxurious feminism which expresses sensual, strong, and decorative elegant based on the womanly beauty. The gorgeous image is a splendid and luxurious image. Also it is the fashion image which is expressed strongly by the decorative detail elements among the design components. Then, it appears often in modem fashion as the pursuit image of modem persons. Therefore, the purpose of this study was not only to analyze the meaning providence and the diagnostic elements about the gorgeous image that appears often in modem fashion, but also to help the various fashion image representations by arranging the presenting principle and the method of fashion image systematically setting in the trend toward modem fashion. The method of this study was a theoretical research of the literature materials concerned with fashion images by the clothes. Also, the questionnaires were completed by selected specialists as investigation subjects who were variously engaged in the fashion-related fields in order to research the gorgeous image. In the above results. the gorgeous image's diagnostic constituent was grasped laying stress on the characteristic of the clothes. Then, the whole concept named Luxury Imagination was chosen, and 4 suits of the gorgeous image were produced by these results In the diversified and personalized modem fashion with he above results the flowing of the gorgeous image is the part able to be expressed exactly in the view of the image pursued by the public.

• Pediatric Gastroenterology, Hepatology & Nutrition
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• 제27권3호
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• pp.168-175
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• 2024

Purpose: The presence of alcoholic stool in biliary atresia (BA) patients is the basis of a stool color card (SCC), a screening tool that has led to more patients receiving Kasai portoenterostomy earlier. This study aimed to evaluate the color image processing of stool images captured using smartphones. We propose that measuring digital color parameters is a more objective method for identifying BA stools and may improve the sensitivity of BA screening. Methods: A prospective study was conducted in five hospitals in Thailand between October 1, 2020, and December 31, 2021. Stools from infants presenting with jaundice, acholic stool, or dark-colored urine were photographed. Digital image color analysis was performed, and software was developed based on the color on the original SCC. Sensitivity and specificity for predicting BA stools were compared between the SCC and the software. Results: Of 33 infants eligible for data collection, 19 were diagnosed with BA. Saturation and blue were two potential digital color parameters used to differentiate BA stools. The receiver operating characteristic curve was used to determine the optimum cutoff point of both values, and when saturation ≤56 or blue ≥61 was set as a threshold for detecting BA stool, high accuracy was achieved at 81.8% and 78.8%, respectively. Conclusion: Digital image processing is a promising technology. With appropriate cutoff values of saturation in hue, saturation, value and blue in red, green, blue color models, BA stools can be identified, and equivocal-colored stools of non-BA patients can be differentiated with acceptable accuracy in infants presenting with jaundice.

• 한국멀티미디어학회논문지
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• 제5권2호
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• pp.167-175
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• 2002

모자이크 영상은 연관성 있는 비디오 프레임이나 정지 영상들을 합성하여 하나의 새로운 영상을 생성하는 것으로서 영상의 정렬, 통합 그리고 중복성에 대한 분석으로 수행된다. 본 논문에서는 효율적인 비디오 데이터 베이스 구축을 위하여 카메라와 객체 파라미터를 이용한 계층형 영상 모자이크 시스템을 제시한다. 모자이크 영상 생성의 빠른 계산 시간과 정적 및 동적 영상 모자이크 구축을 위하여 트리 기반 영상 모자이크 시스템을 구축한다. 카메라 파라미터를 측정하기 위하여 최소사각형 오류기법과 어파인 모델을 이용하였다. 객체의 추출을 위하여 차영상, 매크로 블록, 영역 분할과 4분할 탐색 기법들을 제시하여 사용하였다. 또한, 동적 객체 표현을 위하여 동적 궤도 표현 방법을 제시하였고, 완만한 모자이크 영상 생성을 위하여 블러링을 이용하였다.