• Proceedings of the Korea Information Processing Society Conference
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• 2006.05a
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• pp.889-892
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• 2006

생체정보를 이용한 사용자 인증시스템은 편리함과 동시에 강력한 보안을 제공할 수 있다. 그러나 사용자 인증을 위해 저장된 중요한 생체정보가 타인에게 도용된다면 심각한 문제를 일으킨다. 따라서 타인에게 유출되더라도 재사용이 불가능하도록 하기 위하여 사용자의 생체정보에 역변환이 불가능한 함수를 적용하여 저장하고 변환된 상태에서 인증 과정을 수행할 수 있는 방법이 필요하다. 본 논문에서는 최근 지문 템플릿(Fingerprint Template)을 보호하기 위해 암호학적 방법으로 연구되어지고 있는 퍼지볼트(Fuzzy Vault) 이론을 이용하여 안전하게 지문 템플릿을 보호하는 방법을 제안한다. 특히, 지문 템플릿에 퍼지볼트 이론을 단순 적용할 경우 기준점 부재로 인하여 야기되는 지문 정렬(alignment) 문제를 해결하기 위하여 기하학적 해싱(Geometric Hashing)방법을 사용하였다. 실험을 통하여 제안한 지문 퍼지볼트(Fuzzy Fingerprints Vault) 기법은 추가적인 정보없이 변환된 도메인에서 자동으로 지문 정렬을 수행하여 안전한 지문 템플릿 보호 및 인증이 가능하다는 것을 확인하였다.

• Water Engineering Research
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• v.3 no.4
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• pp.259-267
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• 2002

South Africa has developed a policy and law that calls and provides for the equitable and sustainable use of water resources. Sustainable resource use is dependent on effective resource protection. Rivers are the most important freshwater resources in the country, and there is a focus on developing and applying methods to quantify what rivers need in terms of flow and water quality. These quantified and descriptive objectives are then related to specified levels of ecological health in a classification system. This paper provides an overview of an integrated and systematic methodology, where, fer each river, and each river reach, the natural condition and the present ecological condition are described, and a level/class of ecosystem health is selected. The class will define long term management goals. This procedure requires each ecosystem component to be quantified, starting with the abiotic template. A modified flow regime is modelled for each ecosystem health class, and the resultant fluvial geomorphology and hydraulic habitats are described. Then the water chemistry is described, and the water quality changes that are likely to occur as a consequence of altered flows are predicted. Finally, the responses to the stress imposed on the biota (fish, invertebrates and vegetation) by modified flow and water quality are predicted. All of the predicted responses are translated into descriptive and/or quantitative management objectives. The paper concludes with the recognition of active method development, and the enormous challenge of applying the methods, implementing the law, and achieving river protection and sustainable resource-use.

• Bulletin of the Korean Chemical Society
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• v.27 no.8
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• pp.1149-1153
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• 2006

LPC analogues including natural and unnatural LPC, 3-L-2-PC, acetylated LPC and ethylene glycol derivative are prepared from D-mannitol using in convenient procedures by only changing the synthetic sequences, and their protective activities against cecal ligation and puncture (CLP)-induced severe sepsis are compared. The chirality at C2 position in LPC is found to be required as (S)-configuration for sepsis inhibition, comparing from the protection activity between LPC 6 and unnatural LPC 8. The hydroxyl functionality is also very important and required at C2 or C3 position as shown in the protection activities of ethylene glycol analogue 11 and 3-L-2-PC 9.

• Proceedings of the IEEK Conference
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• 2005.11a
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• pp.1011-1014
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• 2005

In this paper, we propose a method that extracts an invariant biometric key in order to apply this biometric key to the crypto-biometric system. This system is a new authentication architecture which can improve the security of current cryptographic system and solve the problem of stored template protection in conventional biometric system, also. To use biometric information as a cryptographic key in crypto-biometric system, same key should be generated from the same person. However, it is difficult to obtain such an invariant biometric key because biometric data is sensitive to surrounding environments. The proposed method solves this problem by clustering Iris Codes obtained by using independent component analysis (ICA).

• Journal of the Korean Society for Precision Engineering
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• v.21 no.4
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• pp.186-193
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• 2004

Porous anodic alumina has been used widely for corrosion protection of aluminum surfaces or as dielectric material in micro-electronics applications. It exhibits a homogeneous morphology of parallel pores which can easily be controlled between 10 and 400nm. It has been applied as a template for fabrication of the nanometer-scale composite. In this study, mechanical properties of the AAO structures are measured by the nano indentation method. Nano indentation technique is one of the most effective methods to measure the mechanical properties of nano-structures. Basically, hardness and elastic modulus can be obtained by the nano-indentation. Using the nano-indentation method, we investigated the mechanical properties of the AAO structure with different size of nano-holes. In results, we find the hole effect that changes the mechanical properties as size of nano hole.

• Electronics and Telecommunications Trends
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• v.18 no.5 s.83
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• pp.37-51
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• 2003

21세기를 맞이하면서 정보통신 기술의 발전과 인터넷 이용 확산 등으로 사용자 인증이 중요한 문제로 대두되고 있다. 패스워드 또는 PIN을 이용한 사용자 인증 방법이 현재까지 널리 쓰이고 있으나 타인에게 노출되거나 잊어버리는 등의 문제점이 있다. 이러한 문제를 해결하기 위하여 개인의 고유한 생체정보를 이용한 주요 정보 보호 및 사용자 인증 등의 연구가 활발히 진행되고 있다. 그러나, 이러한 생체인식 기술을 대규모 응용에 적용하기 위해서는 생체정보의 안전한 저장/전송/처리 등 생체정보 보호에 대한 연구가 필수적이다. 본 고에서는 이러한 생체정보 보호와 관련된 연구 동향을 소개한다.

• Smart Media Journal
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• v.9 no.2
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• pp.39-50
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• 2020

Derivation cryptographic keys from human biometrics opens a new promising research area when it can be used efficiently for not only verification or recognition tasks, but also symmetric-key based applications. Among existing biometric traits, face is considered as the most popular biometrics since facial features are informative and discriminative. In this paper, we present a comprehensive survey of Face-based key generation (FKGS). First, we summarize the trend of FKGS researches and sum up the methods which play important roles in the proposed key generation systems. Then we present the evaluation and the general performance analysis; from that, we give a discussion about the advantages and disadvantages of surveyed studies to clarify the fundamental requirements and the main challenges when implementing FKGS in practice. Finally, an outlook on future prospects is given.

• Review of KIISC
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• v.18 no.4
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• pp.5-12
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• 2008

ISO/IEC JTC1 SC27은 IT 정보보호 및 보안에 관한 국제표준 제정 활동을 하는 국제기구이다. SC27은 다섯 개의 WG으로 구성되어 있는데, 이들 중 WG3와 WG5에서 총 3건의 바이오인식 관련 정보보호 표준화 작업을 수행하고 있다. 19792 바이오인식 보안 평가(Security Evaluation of Biometrics), 24761 바이오인식 인증 컨텍스트(Authentication Context for Biometrics), 24745 바이오 템플릿 보호(Biometric Template Protection)의 세 건이 바로 그것이다. 바이오인식 관련 전문가들의 활동이 적은 SC27에서 바이오인식 기술에 관한 국제표준화가 함께 진행될 수 있었다는 점은 놀라운 일이며, SC37 바이오인식 관련 국제표준 전문가들의 많은 관심을 통해 SC27에서의 바이오인식 관련 국제표준화 활동이 조속한 결실을 맺을 수 있도록 함께 노력해 나가야 할 시점에 있다 하겠다. 본 고에서는 바이오인식 기술의 관점에서의 SC27 국제표준화 활동 내용을 소개하고 현재까지의 진행상황과 앞으로의 일정 및 추진 방향 등을 분석, 정리하여, 관련 전문가들로 하여금 SC27에서의 바이오인식 관련 표준화 활동에 보다 많은 관심을 가질 수 있도록 하는 계기를 마련하고자 한다.

• Proceedings of the KSME Conference
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• 2004.04a
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• pp.144-149
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• 2004

Porous anodic alumina has been used widely for corrosion protection of aluminum surfaces or as dielectric material in micro-electronics applications. It exhibits a homogeneous morphology of parallel pores which can easily be controlled between 10 and 400nm. It has been applied as a template for fabrication of the nanometerscale composite. In this study, mechanical properties of the AAO structures are measured by the nano indentation method. Nano indentation technique is one of the most effective method to measure the mechanical properties of nano-structures. Basically, hardness and elastic modulus can be obtained by the nano-indentation. Using the nano-indentation method, we investigated the mechanical properties of the AAO structure with different size of nano-holes. In results, we find the hole effect that changes the mechanical properties as size of nano hole.

• Proceedings of the Korea Contents Association Conference
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• 2006.11a
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• pp.242-245
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• 2006

This paper addresses an image fingerprinting scheme for the print-to-capture model performed by a photo printer and digital camera. When capturing an image by a digital camera, various kinds of distortions such as noise, geometrical distortions, and lens distortions are applied slightly and simultaneously. In this paper, we consider several steps to extract fingerprints from the distorted image in print-and capture scenario. To embed ID into an image as a fingerprint, multi-bits embedding is applied. We embed 64 bits ID information as a fingerprint into spatial domain of color images. In order to restore a captured image from distortions a noise reduction filter is performed and a rectilinear tiling pattern is used as a template. To make the template a multi-bits fingerprint is embedded repeatedly like a tiling pattern into the spatial domain of the image. We show that the extracting is successful from the image captured by a digital camera through the experiment.