• 분석과학
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• 제32권3호
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• pp.105-112
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• 2019

Fingerprints may be contaminated with ethanol solutions. In order to solve the case, the law enforcement agency may need to visualize the fingerprint from these samples, but the development method has not been studied. The paper with latent fingerprint was contaminated with ethanol solution and then the blurring of ridge detail was observed. As a result, when the copy paper was contaminated with ethanol solutions of less than 75 % (v/v), the amino acid components of latent fingerprint residue blurred but lipid components of latent fingerprint residue didn't blurred. On the other hand, when the paper was contaminated with ethanol solution of more than 80 % (v/v), the amino acid components of latent fingerprint didn't blurred but the lipid components of latent fingerprint blurred. Therefore, it is found that the paper contaminated with ethanol solutions of less than 75 % (v/v) should be treated by oil red O (ORO) enhancing lipid components, and the paper contaminated with ethanol solutions of 80 % (v/v) or more should be treated by 1,2-indandione/zinc (1,2-IND/Zn) enhancing amino acid components. The blurring of ridge detail was not observed when the fingerprints were deposited with fingers contaminated with ethanol solution. This fingerprints were treated with 1,2-IND/Zn or ORO to compare the latent fingerprint development ability, and using 1,2-IND/Zn was able to visualize the latent fingerprint more clearly than using ORO.

• Parasites, Hosts and Diseases
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• 제33권4호
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• pp.331-340
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• 1995

형태적으로 Aconthamoeba polyphaga로 동정긴 일곱 분리주의 동위효소 profile과 Mitochondria (Mt) DNAangerprint를 비교 분석하였다. 8가지 제한효소(B91 II. Sca I, Cla I, EcoR I, Xba I, Kpa I, Sal I. 및 Sst I)에 의한 Mt DNA fhlgerprint는 주간의 심한 다양성을 나타내었다. B가지 동위효소 (acid phosphatase, lactate dehydrogenase 및 glucose-6-phosphate dehydrogenase)는 주간의 심한 다양성을 나타내었으나 다른 3가지 동위효소(glucose phosphate isomerase, leucine aminopeptidase 및 malatedehydrogenase)는 비슷한 양상으로 나타났다 Ap 주의 동위효소 양상과 Mt DNA fmgerprint는 Jones 주와 동일하였다. Mt DNA fingerprinting은 대식가시아메바 주의 동정과 분리에 매우 유용함을 알았다. Aconthamoeba polvphasa의 우리말 학명을 대식가시아메바로 제안한다.

• 미생물학회지
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• 제47권3호
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• pp.263-267
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• 2011

유전체 지문 분석법은 세균 균주간의 친연성을 판정하는데 유용하다. 그러나 친연성이 낮은 두 균주의 지문 사이에서 우연히 발생하는 DNA 단편 크기의 일치성은 유전형질의 일치성의 해석에 오차를 유발한다. 본 연구는 임의의 두 유전체 지문에서 우연히 DNA 단편의 크기가 일치할 확률을 정량하여, 유전체 지문에 근거한 친연성 해석의 유의성을 고찰하였다. 유전형질 일치성 없이 단편 크기가 일치할 확률은 관찰되는 단편의 수, 관찰 가능한 전체 단편의 수와 크기가 일치하는 단편의 수로부터 계산될 수 있는 함수로 분석되었다. 유의성에 가장 큰 영향을 미치는 독립 매개변수는 전체 단편의 수였으며, 우연한 공통 단편의 수를 10개 미만으로 유지하기 위해서는 약 200개 이상의 단편이 지문에서 관찰될 수 있어야 하는 것으로 계산되었다.

• 분석과학
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• 제33권4호
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• pp.197-207
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• 2020

The current comparison methods with scoring systems that are used to compare visualized latent fingerprints (LF) have disadvantages. Evaluators using these methods are prone to make errors and fail to discriminate LFs correctly to notice the differences among those LFs. Therefore, a comparative and quantitative evaluation method that is capable of obtaining more objective and quantitative results is needed. Densitometric image analysis (DIA) is used in other fields as a reliable semi-quantitative comparison method. To apply DIA to LFs, the potential variables that can occur during the DIA process were tested. The visualized ridges of LFs can be compared using the concentration of dots against the background to make it possible to analyze the ridges with DIA. The variables that can be present during the DIA process include the thickness of the analysis line, the number of ridges to be taken, the number of divided zones within each of the fingerprints, and the angles of the analysis line against the ridge lines that were selected. From the analysis of the inked fingerprints and circular lines that are similar to fingerprints, the angle of the analysis lines with the ridge line was the most significant variable. The preliminary test result was applied to the comparison of LFs that were developed with the powder method and then compared with the AFIS analysis. A similar trend was found, and a more detailed and semi-quantitative comparison of the visualized LFs was possible. In the future, it is necessary to check the evaluative ability of the DIA method by analyzing the visualized LFs with other various development methods. However, DIA is currently an option that can be used as an objective comparative evaluation method during fingerprint studies with supplementary role.

• 융합정보논문지
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• 제10권6호
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• pp.19-27
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• 2020

본 연구에서는 나날이 발전하는 카메라의 해상도 기술과 SNS의 이미지 공유를 통해서 고해상도로 찍은 이미지를 손쉽게 구할 수 있고, 이미지를 통해서 사람의 손가락 지문을 손쉽게 채취하여 이를 악용할 수 있다는 가능성을 고려해 이를 방지하는 기술을 제시한다. 이 기술을 개발하기 위해서는 Python 언어를 이용한 Opencv와 opencv안의 Blur 처리를 해주는 라이브러리 등을 사용한다. 우선 이미지에서 손을 찾아주기 위해서 딥러닝 기반의 학습된 Hand Key point Detection 알고리즘을 사용한다. 이 알고리즘을 이용해 손가락 마디를 찾아 이 마디의 좌표를 이용해 이미지에서의 손가락 지문 부위만을 따로 blur 처리를 해줌으로써 원본 이미지에서의 손상을 최소화하면서 손가락 지문을 보호할 수 있다. 향후 정확한 손가락 추적 알고리즘의 개발로 스마트폰 카메라 app의 내부 옵션으로 사용하여 고해상도의 이미지에서의 지문을 보호할 수 있을 것이다.

• Nano
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• 제13권11호
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• pp.1850128.1-1850128.10
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• 2018

Glutathione (GSH), the protective agent and reducing agent, has been widely used to prepare gold nanoclusters (GSH-Au NCs) with stable fluorescence properties and negative charge of the surface. Meanwhile, polyethyleneimine (PEI) was used as the modification agent to synthesize magnetic ferroferric oxide nanoparticles ($Fe_3O_4$) with fantastic dispersibility and positive charge of the surface. Based on the electrostatic adsorption force, magnetic nano-$Fe_3O_4@GSH-Au$ NCs core-shell microspheres composed of magnetic $Fe_3O_4$ nanoparticles modified by PEI as the core and GSH-Au NCs as the shell were assembled. The prepared $Fe_3O_4@GSH-Au$ NCs microspheres harbored a uniform size (88.6 nm), high magnetization (29.2 emu/g) and excellent fluorescence. Due to the coordination bond action between Au atom and sulfhydryl (-SH), amino ($-NH_2$), carboxyl (-COOH) in sweat, $Fe_3O_4@GSH-Au$ NCs could combine with latent fingerprints. In addition, $Fe_3O_4@GSH-Au$ NCs with good fluorescence and magnetism could detect fingerprints on various objects. Significantly, the powders were not easy to suspend in the air, which avoided the damage to the health of forensic experts and the fingerprints by only powder contacting. Above all, $Fe_3O_4@GSH-Au$ NCs was successfully applied to the latent fingerprint visualization, which has great potential in forensic science.

• 한국산업융합학회 논문집
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• 제9권4호
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• pp.263-268
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• 2006

This paper presents a real-time verification system by extracting a features of multimodal biometrics using hybrid method, which is combined the moment balance and the independent component analysis(ICA). The moment balance is applied to reduce the computation loads by extracting the validity signal due to exclude the needless backgrounds of multimodal biometrics. ICA is also applied to increase the verification performance by removing the overlapping signals due to extract the statistically independent basis of signals. Multimodal biometrics are used both the faces and the fingerprints which are acquired by Web camera and acquisition device, respectively. The proposed system has been applied to the fusion problems of 48 faces and 48 fingerprints(24 persons * 2 scenes) of 320*240 pixels, respectively. The experimental results show that the proposed system has a superior verification performances(speed, rate).

• 제어로봇시스템학회논문지
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• 제18권11호
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• pp.1005-1010
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• 2012

We propose a novel approach to classify fingerprints using the extracted adaptive core block for improving classification performance of incomplete fingerprints in this paper. We compute representative directions from fingerprint images by the block unit and learn horizontal and vertical Markov models by deciding the center position of a fingerprint image based on the expert knowledge. The center block of a test image is the block has the highest probability after comparing the Markov model with $11{\times}11$ blocks. The proposed approach can effectively classify incomplete fingerprints using the optimal center block.

• 반도체디스플레이기술학회지
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• 제13권4호
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• pp.77-81
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• 2014

There have been developed in authentication systems for information using biometric information approaches such as fingerprint, face, and iris. In general, a door-lock system is operated by touching keypads, which remains fingerprints on the keypads. Such door-lock systems do not protect personal information from others due to the exposure of fingerprints to keypads. In this paper, we propose the new door-lock system that does not leave fingerprints on the keypads. Without touching keypad the system works because the system accepts authentication information by using illuminance sensor and LED. The experiment shows that the implemented door-lock system works well under any circumstance.

• Journal of Information Processing Systems
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• 제6권4호
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• pp.511-520
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• 2010

This paper proposes two new methods to detect the fingerprints of different persons based on one-dimensional and two-dimensional discrete wavelet transformations (DWTs). Recent literature shows that fingerprint detection based on DWT requires less memory space compared to pattern recognition and moment-based image recognition techniques. In this study four statistical parameters - cross correlation co-efficient, skewness, kurtosis and convolution of the approximate coefficient of one-dimensional DWTs are used to evaluate the two methods involving fingerprints of the same person and those of different persons. Within the contexts of all statistical parameters in detection of fingerprints, our second method shows better results than that of the first method.