• 전기전자학회논문지
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• 제20권3호
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• pp.291-294
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• 2016

본 논문은 새로운 광학적 일회용 패턴암호 상호 인증 방법을 제안한다. 이 방법은 2-단계 위상천이 디지털 홀로그래피 기법을 사용하여 이중 인증을 제공하고, 광학적 일회용 패턴암호를 상호 양방향으로 시도-응답 악수 기법을 구현하여 양방향 인증을 수행한다. 클라이언트와 서버는 상호 인증시 일회용 패턴암호를 무작위 수로 선택하여 오직 한번만 사용하고 이를 암호화하여 전송하기 때문에, 되풀이 공격이나 중간자 공격과 같은 암호공격으로부터 암호시스템을 보호하고 보안수준을 한층 더 높일 수 있다.

• Structural Monitoring and Maintenance
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• 제6권1호
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• pp.67-84
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• 2019

Digital Image Correlation technique (DIC) is a non-contact optical method for rapid structural health monitoring of critical infrastructure. An innovative approach to DIC is presented using QR (Quick Response) code based random speckle pattern. Reinforced Cement Concrete (RCC) beams of size $1800mm{\times}150mm{\times}200mm$ are tested in flexure. DIC is used to extract Moment (M) - Curvature (${\kappa}$) relationships using random speckle patterns and QR code based random speckle patterns. The QR code based random speckle pattern is evaluated for 2D DIC measurements and the QR code speckle pattern performs satisfactorily in comparison with random speckle pattern when considered in the context of serving a dual purpose. Characteristics of QR code based random speckle pattern are quantified and its applicability to DIC is explored. The ultimate moment-curvature values computed from the QR code based random speckled pattern are found to be in good agreement with conventional measurements. QR code encrypts the structural information which enables integration with building information modelling (BIM).

• 디자인학연구
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• 제15권2호
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• pp.19-26
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• 2002

Comtemporary popular culture fosters information exchanges through the development of digital products. Digital products may lead, or may be led, by outline popular culture. However, popular culture is possible off-line as well. There are certainly diverse classes of people who use digital products; however, the major users are those who mainly use the networks. These users have ample access to information and thereby lead popular culture and also are led by it. Surely, it is not only the popular culture that digital products take into consideration. In modern times, personal computers and the Internet are changing into privately owned digital products. Amid the collective tendency of popular culture, the owned products emphasize the fact that it is ′mine only.′It would be goad if ′interesting′materials, something that teenagers like, are added to digital products. Surely, there is a limit to ′interesting′ materials, but the materials of "S or energy," which has a certain sense of humor as well as giving out fresh energy, can be considered in digital product esign. It can be considered a modern pattern, or at least the addition of a new value, and not the old-time pattern of the "Ten Long-Living Animals." More popular and diverse colors are needed in the mix of digital products used by adults who are middle-aged or elderly. If altered colors are applied to the digital products as much as popular culture changes, it can assist the elderly with their weakened physical abilities.

• 디지털융복합연구
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• 제17권4호
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• pp.285-290
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• 2019

본 연구는 아날로그 연필, 펜 등과 같은 필기구를 사용하여 패턴을 그리는 젠탱글 아트(zentangle art) 제작 과정 중, 디지털 아트의 효과적인 융복합을 통해서 보다 창의적인 젠텡글 아트 작품을 제작하기 위한 방법론과 활용 가능성에 대한 연구이다. 특히 디지털 아트의 저작도구를 활용한 제작 방식과 한국 전통문양의 형태별 분류인 식물문(食物紋)의 상징성(symbol)을 응용하여 전통문양과 젠탱글 아트가 융합된 디자인을 연구하고 기호학의 관점에서 연구 및 분석했으며 그에 따른 새로운 방향성을 제시한다. 향후에는 제작자를 중심으로 젠탱글 아트 작품 제작 시 발생하는 특유의 몰입감과 심리적 현상을 연구할 예정이다. 추후, 지속적인 연구를 통해서 젠텡글 아티스트 및 연구자들에게 콘텐츠 제작의 새로운 확장성과 산업적 가치를 제시할 계획이다.

• 정보처리학회논문지:소프트웨어 및 데이터공학
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• 제4권12호
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• pp.561-570
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• 2015

IT 기술이 급격히 발전함에 따라서 디지털 멀티미디어 장치 및 소프트웨어를 이용한 콘텐츠가 범람하고 있다. 그러나 불법적 목적을 가지고 있는 사용자가 활용함에 따라 이를 이용한 범죄가 증가되고 있고 멀티미디어 포렌식을 통한 콘텐츠의 보호 및 불법 사용 차단의 필요성이 대두되고 있다. 본 논문에서는 센서 패턴 잡음을 이용하여 디지털 영상 획득 장치 판별을 위한 포렌식 기술에 대하여 제안한다. 먼저 광자 탐지기의 빛에 대한 민감도가 불완전해 생기는 센서 패턴 잡음을 검출하기 위한 기술에 대하여 제시한다. 그다음에 참조 영상들에 대하여 센서 패턴 잡음을 추정하고, 검사 영상에 대하여 센서 패턴 잡음을 추정한 후 두 잡음 사이의 유사성 계산을 통하여 디지털 영상을 획득한 장치에 대하여 판별하는 방법을 설명한다. 제안한 기술의 성능 분석을 위하여 DSLR 카메라, Compact 카메라, 스마트폰, 캠코더 등을 포함한 총 10대 장치에 대하여 개발한 알고리즘에 대한 정량적 성능의 분석을 수행하였고, 그 결과 99.6%의 판별 정확도를 달성하였다.

• 한국HCI학회:학술대회논문집
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• 한국HCI학회 2008년도 학술대회 2부
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• pp.624-628
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• 2008

본 연구의 목적은 디지털 환경 하에서의 소비 행동에 대해 소비자들이 가지고 있는 마음의 패턴 혹은 주관적 코드, 즉 주관성(subjectivity)을 발견하는 것이다. 정보통신 분야를 포함한 디지털 제품과 서비스의 사용은 기술의 수용을 넘어, 소비자들의 일상적인 삶을 구성하는 주요 활동으로 자리매김하고 있음에도 불구하고, 소비자들에 대한 논의는 일반적으로 이들의 특징적인 활용이나 소비매체를 활용하는 개별적인 현상이나 사례로만 이야기 되고 있다. 본 연구에서는 디지털 환경에서의 소비 형태의 유형과 각 유형에서 작용하는 중요한 가치들과 심리적, 행동적 특성들에 대해 탐색해보았다. 연구대상은 실제 언론과 여러 문헌들에서 주요 디지털 소비 활동으로 언급하고 있는 특성들과 함께 소위 디지털 신인류들이 디지털 제품과 서비스 영역과 사이버 공간에서 보이는 다양한 활동과 현상을, 그리고 그들의 다양한 사회적 관계와 일과 놀이, 일반적인 소비 특성들을 근거로 한 디지털 소비 행동 문항이었으며, 연구참여자는 정보통신 분야의 디지털 전문가들과 일반소비자들, 총 33명이었다. 총 76개의 디지털 소비 행동 문항을 대상으로 디지털 소비자 유형을 구분해본 결과, 총 6개의 디지털 소비자 유형이 추출되었다. 각 집단은 'Digital Modernist', 'Digital Boomer', 'Digital Chic', 'Digital Ludens', Digital Conservative', 'Digital Renaissance'로 명명되었다. 각 유형은 디지털 소비 행동과 연계되어, 디지털 제품과 서비스에 부여하는 가치와 라이프스타일로 구체화되었다. 본 연구는 디지털 시대의 소비 행동의 유행과 그 속에 내포된 가치와 니즈를 전체적으로 조망해볼 수 있는 틀을 제공했다는데 의미가 있다.

• 디지털산업정보학회논문지
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• 제9권2호
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• pp.111-119
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• 2013

Face recognition has recently become one of the most popular research areas in the fields of computer vision, machine learning, and pattern recognition because it spans numerous applications, such as access control, surveillance, security, credit-card verification, and criminal identification. In this paper, we propose a simple descriptor called an ECSP(Extended Center-Symmetric Pattern) for illumination-robust face recognition. The ECSP operator encodes the texture information of a local face region by emphasizing diagonal components of a previous CS-LBP(Center-Symmetric Local Binary Pattern). Here, the diagonal components are emphasized because facial textures along the diagonal direction contain much more information than those of other directions. The facial texture information of the ECSP operator is then used as the input image of an image covariance-based feature extraction algorithm such as 2D-PCA(Two-Dimensional Principal Component Analysis). Performance evaluation of the proposed approach was carried out using various binary pattern operators and recognition algorithms on the Yale B database. The experimental results demonstrated that the proposed approach achieved better recognition accuracy than other approaches, and we confirmed that the proposed approach is effective against illumination variation.

• 한국실내디자인학회논문집
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• 제17권3호
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• pp.156-164
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• 2008

Through staggering advancements of technology and network as we know them as digital revolution, we have established a foundation of space in which we can express reality by eliminating the boundaries between expression, space, and movement. There are many ongoing approaches that aim to overcome the physically-fixed property of space where the mathematical-geometric notion of Voronoi Diagram is one of them. Although the repetitive increment based on self-organization during the process in which space is generated by the Voronoi Diagram forms a pattern and focuses on the formation, its pattern is not restricted to a single method of expression but evolves over self-control. The result of having analyzed spaces generated by the Voronoi Diagram in this study can be summarized as follows. First, the Voronoi computation method with self-organization property creates multiple levels, increments, and evolves through feedbacks among changes with the slightest order and in the absence of control. Secondly, after forming a pattern through such feedbacks comes the differentiation phase due to the presence of different properties. Thirdly, a space that has gone through the generation process retransforms through active interaction between changes and it obtains ambiguous boundaries and a repetitive pattern. This leads to an evolution of space through repetitive increments based on self-organization. Such flexible space creation is supported by various digital technologies where we believe a converging application of these studies, sciences, engineering concepts, and space design is and effective and new method in terms of space creation.

• 한국IT서비스학회지
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• 제21권6호
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• pp.73-89
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• 2022

After COVID-19, the percentage of digital consumption has soared. Meanwhile, as the online platform market grows in size and digital commerce is activated, controversy over the "dark pattern" that induces consumers to do unintended things online continues. Dark patterns are deceptive design patterns that cause consumer rights and financial damage and can result in damaging fair market competition. As a result, the need to regulate dark patterns is raised not only by overseas regulators but also in Korea, and there are growing calls for strengthening consumer protection against dark patterns, with amendments to related laws being proposed by the National Assembly. On the other hand, there is no agreed definition of dark pattern from a normative point of view, and there is a concern that even legitimate advertising marketing activities of companies may be regulated, so a review of dark pattern regulatory measures is required. In this study, dark patterns were reviewed from a normative point of view and appropriate regulatory measures were analyzed. In particular, the problem of the dark pattern can be applied in a way that the market regulates and controls itself in consideration of the characteristics of the online platform. This study reviewed the possibility of self-regulation for dart patterns and proposed the role of each subject.

• Journal of Periodontal and Implant Science
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• 제36권1호
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• pp.61-68
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• 2006

The factors influencing long-term prognosis of teeth must be carefully considered. Among these, attachment level is strongly associated with tooth loss. The purpose of the present study was to estimate pattern of attachment loss based on attachment area in extracted teeth. 197 satisfied the criteria for assessment after staining. The protocol described by Waerhaug(l975) was performed. An indir ect method, based on digital image abstracted from digital camera and digital imaging software program, was used to calculate the root surface area and the attachment loss area. The data were analysed using SPSS. Except maxillary central incisior and mandibular canine, no statistical significant differences between each root surfaces were observed in anterior teeth. In posterior teeth, statistical significant differences in palatal surface of maxillary molar and mandibular molar compared with others were observed. Statistical significant difference in buccal surface compared with others was lowly observed in single and multi rooted. This study did not reveal progressive loss pattern of attachment area in each root surface but clarified root surface that has relative high loss rate of attachment area at extraction. Thus understanding this pattern of attachment loss is helpful for dentist to treat the periodontitis.