• KSII Transactions on Internet and Information Systems (TIIS)
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• 제12권12호
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• pp.6177-6200
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• 2018

In order to achieve the goal of protecting medical images, some existing watermark techniques for medical image protection mainly focus on improving the invisibility and robustness properties of the method, in order to prevent unnecessary medical disputes. This paper proposes a novel copyright method for medical image protection based on visual secret sharing (VSS) and cellular automata transform (CAT). This method uses the protected medical image feature as well as VSS and a watermark to produce the ownership share image (OSI). The OSI is used for medical image verification and must be registered to a certified authority. In the watermark extraction process, the suspected medical image is used to generate a master share image (MSI). The watermark can be extracted by combining the MSI and the OSI. Different from other traditional methods, the proposed method does not need to modify the medical image in order to protect the copyright of the image. Moreover, the registered OSI used to verify the ownership and its appearance display meaningful information, facilitating image management. Finally, the results of the final experiment can prove the effectiveness of our method.

• 디지털콘텐츠학회 논문지
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• 제13권4호
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• pp.531-538
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• 2012

시각암호는 복잡한 암호학적 연산 없이 분산된 영상을 중첩함으로써, 인간의 시각에 의해 비밀영상을 직접 복원할 수 있는 방법이다. 최근까지 시각암호 분야는 크게 복호화 된 영상의 해상도를 향상시키기 위한 비밀 분산법, 분산된 영상의 크기가 변하지 않는 비밀 분산법 그리고 크기조절에 강인한 비밀 분산법 등에 관하여 연구되고 있다. 시각암호 그 자체는 단순히 분산된 영상만 이용하기 때문에 공격받기 쉽다. 따라서 비밀영상을 안전하게 공유할 수 있는 시각암호 구조가 필요하기 때문에 본 논문에서는 실제 사용될 수 있는 기본적인 시각암호 구조에서 커버영상을 이용해 개선된 시각암호 구조를 제안한다. 제안된 방법은 커버영상의 변조를 줄임으로써 steganalysis를 어렵게 하여 확률적으로 높은 안전성을 제공한다. 또한 잡음을 생성하지 않고, 비밀영상을 온전히 복원할 수도 있음을 보였다.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제14권7호
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• pp.2862-2878
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• 2020

Data Security is the most challenging area in Internet communication, where most of the secret sharing schemes are proposed for binary images. But still it lacks in providing security for data communication, especially in image transmission. Traditional visual cryptography scheme generate meaningless diwies and the reconstruction phase leads to quality degradation over the secret image. In this work, an intelligent two dimensional secret share construction scheme is proposed. A secret image is expanded into n diwies with the choice of scheme selection. By Stacking all the qualified diwies to revert the secret image without content loss and less than s^* - 1 shares could not reveal any information about the secret image. The experimental results emphasize that the proposed secret share scheme is highly secured for image transmission.

• 한국정보통신학회:학술대회논문집
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• 한국해양정보통신학회 2004년도 춘계종합학술대회
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• pp.760-763
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• 2004

지문 데이터를 광시각암호에 적합하게 Secret Sharing하고 Share 데이터의 일부를 공개된 네트워크로 전송하고 지문의 소유자가 나머지 Share를 소유하고 있다가 필요 시 지문과 함게 Share를 제시하여 본인임을 인식시키는 광시각암호 기반의 생체정보보호 방범을 제안한다.

• ETRI Journal
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• 제37권5호
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• pp.979-989
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• 2015

Recently, Hou and others introduced a (2, n) block-based progressive visual cryptographic scheme (BPVCS) in which image blocks can be gradually recovered step by step. In Hou and others' (2, n)-BPVCS, a secret image is subdivided into n non-overlapping image blocks. When t ($2{\leq}t{\leq} n$) participants stack their shadow images, all the image blocks associated with these t participants will be recovered. However, Hou and others' scheme is only a simple 2-out-of-n case. In this paper, we discuss a general (k, n)-BPVCS for any k and n. Our main contribution is to give two constructions (Construction 1 and Construction 2) of this general (k, n)-BPVCS. Also, we theoretically prove that both constructions satisfy a threshold property and progressive recovery of the proposed (k, n)-BPVCS. For k = 2, Construction 1 is reduced to Hou and others' (2, n)-BPVCS.

• Educational Technology International
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• 제8권1호
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• pp.1-16
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• 2007

The general aim of this article is to explicate what can be researched in our field based on the new understanding on the ability of human visual intelligence. To follow this aim, three key discussions were followed. The first is to explain why the human visual intelligence research is so important in our field and how it was neglected. The basic orientations of the research questions used in its framing and in answering are reviewed. After reviewing traditional research orientations, as the second discussion, alternative, more useful perspective for thinking about human visual intelligence is suggested. And the possibility of contribution for the future research in general is discussed. In doing so, human visual intelligence was defined in rather practically oriented ways rather than theoretically oriented ones. More practical perspectives were suggested. The third discussion is to show how to use the alternative perspectives of human visual intelligence in the areas of educational technology research. It was hoped that the article lays out conceptual groundwork for generation of educational technology research frameworks which can be used for the research conduct, reproduction and sharing by adopting practically oriented views on human visual intelligence as a new territory of educational technology research.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제9권3호
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• pp.1231-1245
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• 2015

People have transferred their business model from traditional commerce to e-commerce in recent decades. Both shopping and payment can be completed through the Internet and bring convenience to consumers and business opportunities to industry. These trade techniques are mostly set up based on the Secure Sockets Layer (SSL). SSL provides the security for transaction information and is easy to set up, which makes it is widely accepted by individuals. Although attackers cannot obtain the real content even when the transferred information is intercepted, still there is risk for online trade. For example, it is impossible to prevent credit card information from being stolen by virtual merchant. Therefore, we propose a new mechanism to solve such security problem. We make use of the disposable dynamic security code (DSC) to replace traditional card security code. So even attackers get DSC for that round of transaction, they cannot use it for the next time. Besides, we apply visual secret sharing techniques to transfer the DSC, so that interceptors cannot retrieve the real DSC even for one round of trade. This way, we can improve security of credit card transaction and reliability of online business. The experiments results validate the applicability and efficiency of the proposed mechanism.

• 인터넷정보학회논문지
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• 제11권3호
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• pp.15-24
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• 2010

본 논문에서는 대용량 온라인 이미지 공유 사이트를 적용 도메인으로 하여 이미지 검색의 만족도를 높이고자 태그의 의미적 연관성과 이미지 자체의 내용 정보를 결합하는 이미지 분류 방법을 제안한다. 이미지 검색 및 분류 알고리즘이 플리커와 같은 대용량 이미지 공유 사이트에서 활용될 수 있으려면 실제 웹상의 태깅된 이미지를 대상으로 한 적용이 가능해야 한다. 제안된 알고리즘은 'bag of visual word'기반의 이미지 내용으로 웹 이미지를 분류하기 위한 것으로서, 의미적 연관태그를 이용해 일차 검색된 이미지들을 훈련 데이터로 사용하여 카테고리 모델을 훈련하고, PLSA를 적용하여 평가 이미지들을 분류하는 것이다. 제안된 방법으로 플리커의 웹 이미지들을 대상으로 실험한 결과, 태그 정보를 이용한 기존의 방법에 비해 우수한 검색 정확도 및 재현율을 확인할 수 있었다.

• 재활치료과학
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• 제12권2호
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• pp.55-68
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• 2023

목적 : 본 연구는 뇌성마비 아동에게 시지각 중재를 적용한 연구들에 대해 체계적으로 고찰하여, 시지각중재의 효과에 대해 분석하고자 한다. 연구방법 : 데이터 베이스는 PubMed, EMbase, Science Direct, ProQuest, Koreanstudies Information Service System (KISS), Research Information Sharing Service (RISS), 국회도서관을 사용하였다. 키워드는 뇌성마비, 시지각, cerebral palsy, CP, visual perception을 사용하였다. PRISMA Flowchart에 따라 2012년 1월 1일부터 2022년 3월 30일까지 게재된 연구 중에서 10편을 선정하였다. 선정된 연구들의 질적 수준, 연구 대상자의 인구학적 특성, 중재의 효과, 중재의 영역과 전략, 중재의 효과를 측정하기 위한 평가도구, 비뚤림 위험에 대해 분석하였다. 결과 : 선정된 모든 연구에서 시지각 중재가 시지각 기능 증진에 효과적임을 확인하였다. 또한 시지각중재는 시지각 기능뿐만 아니라 상지기능, 일상생활활동, 자세조절, 목표달성, 심리사회 영역에서도 긍정적인 결과를 나타냈다. 눈-손 협응 영역은 모든 연구에서 중재되었다. 결론 : 시지각 중재 시 시지각 기능을 영역별로 평가하고, 개인별 체계적으로 단계화된 맞춤 중재를 적용해야 한다.

• 한국실내디자인학회논문집
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• 제26권4호
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• pp.75-83
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• 2017

The cultural tendency based on sharing and cooperation, which has recently been a hot issue, accelerates throughout the world. This study began with a perception that a sharing culture is inherent in urban public spaces. This study aims to conduct a theoretical study of the sharing culture and to analyze the characteristics of the design composition of public spaces. This study selected squares in 16 European cities as cases for analysis. The results are summarized as follows:1)To analyze the design characteristics of public spaces in which a sharing culture is inherent, this study drew the shape and type of planes and sharing elements such as accessibility, symbolism and activity with the squares in the cases. 2)The shape of planes in the squares in the cases has been formed in close relations with the historic meaning and events of the area and the process of the construction of buildings surrounding the square. The squares in the cases were classified into seven plane types, and these squares have developmentally contributed to the formation of a sharing culture as a place for free participation and communication concerning social issues. 3)In the squares in the cases, the weight of road-centered access appears high, and in terms of the construction of human-friendly / environment-friendly infrastructure in the city or judging from the trend of the recent increase of pedestrian-centered plans for public space, it is judged that approaches with a high utilization rate of sidewalk or public transportation would be desirable. 4)Symbolic elements of the square become a device by which citizens can share the historic symbolism, along with artistic inspiration. In addition, by serving as an observatory from which people can take a view of the landscape of the city, it allows visual sharing of the entire city as well as the square. 5)A square is common pool resources in the community, and it is necessary to vitalize that in a direction of increasing the possibility of sharing, through the characteristics and methods of the composition of public design.