• Smart Media Journal
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• v.8 no.3
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• pp.62-69
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• 2019

Electrocardiogram (ECG) signals cannot be counterfeited and can easily acquire signals from both wrists. In this paper, we propose a method of generating a coupling image using direction information of ECG signals as well as its usage in a personal recognition method. The proposed coupling image is generated by using forward ECG signal and rotated inverse ECG signal based on R-peak, and the generated coupling image shows a unique pattern and brightness. In addition, R-peak data is increased through the ECG signal calculation of the same beat, and it is thus possible to improve the recognition performance of the individual. The generated coupling image extracts characteristics of pattern and brightness by using the proposed convolutional neural network and reduces data size by using multiple pooling layers to improve network speed. The experiment uses public ECG data of 47 people and conducts comparative experiments using five networks with top 5 performance data among the public and the proposed networks. Experimental results show that the recognition performance of the proposed network is the highest with 99.28%, confirming potential of the personal recognition.

• Proceedings of the Korea Information Processing Society Conference
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• 2019.10a
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• pp.868-871
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• 2019

본연구는 커플들의 이미지 빅 데이터를 분석하여 각각 얼굴과 패션에 따라 유사한 유형 끼리 클러스터링 하여 새로운 사람 이미지가 주어졌을 때 해당 사람이 어느 유형에 속하는지 찾아내고 해당 유형의 사람들은 어떤 유형의 이성과 잘 맞는지 찾아 추천해주는 플랫폼이다. 빅 데이터를 수집하기 위하여 SNS상에서 커플들의 이미지를 크롤링하여 저장한다. 수집된 커플들의 이미지를 AI 머신 러닝으로 나이, 성별을 분석하여 미리 설정한 나이대의 이성 커플들의 이미지 만을 추려내서 각각 남, 여의 이미지를 분리하여 저장한다. 해당 이미지들로 비슷한 얼굴, 패션 유형의 사람들을 같은 클러스터로 모으고 CNN 으로 학습 시켜서 새로운 이미지가 들어올 경우 효율적으로 해당 이미지가 어느 클러스터에 속하는지 찾아낼 수 있도록 한다. 특정 이미지가 속하는 클러스터를 찾아내면 해당 클러스터에 속하는 사람들의 연인들이 어느 클러스터에 가장 많이 포함되어 있는지 찾아서 해당 클러스터 유형의 이성을 추천해준다. 웹과 어플리케이션으로 이루어진 플랫폼 서비스이며, 커플 매칭 기능 뿐만 아니라 매칭된 회원 간 연락 기능, 실제 커플의 이미지로 두 사람의 매칭도 확인 등의 부가적 기능 또한 인공 지능 서비스로 제공된다.

• Journal of IKEEE
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• v.14 no.1
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• pp.8-16
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• 2010

This paper presents a design of the successive approximation ADC(SA-ADC) applicable to a midium-low speed analog-front end(AFE) for the maximum 15MS/s CCD image processing. SA-ADC is effective in applications ranging widely between low and mid data rates due to the large power scaling effect on the operating frequency variations in some other way of pipelined ADCs. The proposed design exhibits some distinctive features. The "differential capacitor-coupling scheme" segregates the input sampling behavior from the sub-DAC incorporating the differential input and the sub-DAC output, which prominently reduces the loading throughout the signal path. Determining the MSB(sign bit) from the held input data in advance of the data conversion period, a kind of the signed successive approximation, leads to the reduction of the sub-DAC hardware overhead by 1 bit and the conversion period by 1 cycle. Characterizing the proposed design in a 3.3 V $0.35-{\mu}m$ CMOS process by Spectre simulations verified its validity of the application to CCD analog front-ends.

• Korean Journal of Optics and Photonics
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• v.13 no.5
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• pp.442-448
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• 2002

In the earth telescope for space observation, the adaptive optical (AO) system that immediately compensates atmospheric turbulence is helpful to get high-resolution images. An adaptive optics for earth telescopes is very attractive, since the Earth telescopes can be made at lower costs and have larger optical apertures than space telescopes. Generally. in order to remove the wavefront error produced by atmospheric turbulence, a deformable mirror, whose surface shape changes in a controllable way in response to a drive signal, is used. The characteristics and patterns of actuators are very important for the effective control of a deformable mirror. The mirror surface shape deformed by one actuator is defined as an influence function and the deformable mirror can be effectively modeled and designed using this influence function. In this paper. by simplifying the actual influence function obtained by FEM analyses into the Gaussian function and introducing the coupling coefficient between actuators, the influence function is constructed. The proper coupling coefficient of the target system can be obtained by performance analyses of a deformable mirror for various coupling coefficients. Using the constructed influence function, the deformable mirror with equally spaced triangular and square actuator patterns is analyzed for various spacings and an effective actuator pattern is proposed.