• 인터넷정보학회논문지
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• 제21권5호
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• pp.67-73
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• 2020

In this paper, we present a CNN-based gesture recognition approach which reduces the memory burden of input data. Most of the neural network-based gesture recognition methods have used a sequence of frame images as input data, which cause a memory burden problem. We use a motion history image in order to define a meaningful gesture. The motion history image is a grayscale image into which the temporal motion information is collapsed by synthesizing silhouette images of a user during the period of one meaningful gesture. In this paper, we first summarize the previous traditional approaches and neural network-based approaches for gesture recognition. Then we explain the data preprocessing procedure for making the motion history image and the neural network architecture with three convolution layers for recognizing the meaningful gestures. In the experiments, we trained five types of gestures, namely those for charging power, shooting left, shooting right, kicking left, and kicking right. The accuracy of gesture recognition was measured by adjusting the number of filters in each layer in the proposed network. We use a grayscale image with 240 × 320 resolution which defines one meaningful gesture and achieved a gesture recognition accuracy of 98.24%.

• 디지털융복합연구
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• 제14권4호
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• pp.251-258
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• 2016

빅 데이터 처리는 데이터의 크기나 복잡도가 커서 기존의 전통적인 데이터 처리 기법으로는 다루기 힘든 데이터의 처리를 의미한다. 싱글보드 컴퓨터를 포함하는 스마트 기기의 보급은 데이터를 처리하는 방법에 많은 영향을 미치고 있으며 이 들을 활용하여 데이터를 처리하는 기법에 대한 연구가 진행되고 있다. 본 연구에서는 빅 데이터 처리에 필요한 분산처리 시스템을 데스크톱 기기 환경이 아니라 라즈베리파이를 활용하여 하둡 분산처리 환경을 구축하는 방안을 제시한다. 또한 제안하는 시스템의 다양한 테스트를 통한 성능 분석과 스케일링의 용이성을 통해 구축한 학습 환경 구성의 효율성을 보인다.

• Biotechnology and Bioprocess Engineering:BBE
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• 제11권1호
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• pp.61-66
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• 2006

The simple Langmuir isotherm is frequently employed to describe the equilibrium behavior of protein adsorption on a wide variety of adsorbents. The two adjustable parameters of the Langmuir isotherm - the saturation capacity, or $q_m$, and the dissociation constant, $K_d$ - are usually estimated by fitting the isotherm equation to the equilibrium data acquired from batch equilibration experiments. In this study, we have evaluated the possibility of estimating $q_m$ and $K_d$ for the adsorption of bovine serum albumin to a cation exchanger using batch kinetic data. A rate model predicated on the kinetic form of the Langmuir isotherm, with three adjustable parameters ($q_m,\;K_d$, and a rate constant), was fitted to a single kinetic profile. The value of $q_m$ determined as the result of this approach was quantitatively consistent with the $q_m$ value derived from the traditional batch equilibrium data. However, the $K_d$ value could not be retrieved from the kinetic profile, as the model fit proved insensitive to this parameter. Sensitivity analysis provided significant insight into the identifiability of the three model parameters.

• Nuclear Engineering and Technology
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• 제27권1호
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• pp.1-7
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• 1995

다공성 매질을 통한 방사성 핵종의 콜로이드에 의한 이동을 실험과 새로운 모델을 도입하여 살펴보았다. 본 실험에서는 기존의 컬럼 슬라이스 방법을 개선하기 위하여 비파괴 스캐닝 시스템을 개발하였다. 이 장치를 이용하여 기존의 방법보다 훨씬 많은 핵종이동에 관한 자료를 측정하였다. 중성자조사를 시킨 진흙 입자와 여기에 방사성 핵종을 흡착시켜 콜로이드 입자를 만들었다. 실험결과 콜로이드 입자의 크기 분포에도 불구하고 콜로이드 여과계수는 2개의 그룹으로 명백히 구분되었다. 이를 모사하기 위하여 2개의 파라미터를 이용한 새로운 모델식이 개발되었고, 모델식은 실험결과를 잘 모사하였다. 흡착된 핵종중 $^{137}$Cs은 주로 콜로이드 형태로 이동하였으나 $^{Sr}$ 은 그렇지 않았다.

• 한국컴퓨터정보학회논문지
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• 제8권2호
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• pp.24-30
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• 2003

본 논문에서는 JPEG 영상의 오차(PSNR)의 개선을 위해 반올림 양자화와 내림 양자화의 장점을 조합하여 가변 임계값을 갖는 양자화 방법(VTQM: Variable Threshold quantization Method)을 제안하고, 실험에 의해 VTQM의 비트율 대비 PSNR을 표준 JPEG방법의 경우와 비교하였다. VTQM에서는 양자화 방법에 따라 영상의 압축률에 영향을 미치는 영역에서는 압축한 결과값의 길이가 줄어들 수 있도록 임계값을 조정하여 양자화하고, 그 외의 경우에는 원시 영상의 값을 유지하는 방향(반올림)으로 양자화 한다. 그 결과 최대한 화질을 유지하면서 비트율을 감소시킬 수 있다. 몇 개의 샘플 영상에 대한 실험 결과, VTQM은 기존의 반올림과 내림 양자화 방법보다 같은 비트율에서 PSNR이 각각 0.2∼0.3dB, 0.4∼0.5dB 향상되는 것을 보여주었다.

• 융합신호처리학회논문지
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• 제5권4호
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• pp.271-280
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• 2004

본 논문에서는 반복적 영상복원과정에서 자주 등장하는 경계관련 오류와 물체관련 오류를 효과적으로 제거하기 위한 새로운 반복적 영상복원방법을 제안하고자 한다. 제안한 방법은 반복과정내부에 웨이블렛 축소법을 이용한 변형된 CGM(Conjugate Gradient Method)을 이용하였다. 제안한 방법은 CGM과 같은 빠른 복원과 함께 웨이블렛 축소법에 의한 적응적인 잡음제거와 오류제거를 동시에 제공한다. 효과적인 잡음제거와 오류제거를 동시에 얻기 위해 웨이블렛 축소는 위치에 따라 변하는 웨이블렛 축소규칙을 사용하였다. 기존의 반복적 영상복원 알고리즘인 LR(Lucy-Richardson), CGM과의 비교실험을 통해 제한한 방법이 LR에 비교해서는 전체적으로 향상된 복원과 물체관련오류가 거의 없다는 측면, 그리고 CGM과의 비교에서는 물체 및 경계 관련오류가 거의 없다는 측면에서 기존의 방법에 비해 우수하다는 것을 확인하였다.

• 한국생물정보학회:학술대회논문집
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• 한국생물정보시스템생물학회 2006년도 Principles and Practice of Microarray for Biomedical Researchers
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• pp.78-78
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• 2006

Gene expression analysis can be performed by one-color (intensity-based) or two-color (ratio-based) microarray platforms depending on the specific applications and needs of the researcher. The traditional two-color approach is well founded from a historical and scientific standpoint, and the one-color approach, when paired with high quality microarrays and a robust workflow, offers additional flexibility in experimental design. Two of the major requirements of any microarray platform are system reproducibility, which provides the means for high confidence experiments and accurate comparison across multiple samples; and high sensitivity, for the detection of significant gene expression changes, including small fold changes across multiple gene sets. Each of these requirements is fulfilled by the Agilent One-color Gene Expression Platform as illustrated by the data included in this study. As a result, researchers have the ability to take advantage of the enhanced performance and sensitivity of Agilent's 60-mer oligonucleotide microarrays, and experience the first commercial microarray platform compatible with both one- and two-color detection.

• 대한조선학회논문집
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• 제41권4호
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• pp.68-76
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• 2004

Inherent strain method for analyzing deformation of line-heating is substituting experiments of high cost, because of its high accuracy and quickness. Nowadays, the progressing forms of line-heating are not straight moving motions used to traditional studies, but weaving motions which can diversely input heat source. In shipyard, reasons of weaving motions are induction of a special characteristic by water cooling, maximum temperature limitation for keeping plates from melting, and rhythm for workman's maintaining velocity. On this study, a method which can obtain optimal weaving heating condition was presented, some examples were introduced, and the results corresponded to works of shipyard. Lastly, what the specifications of plates on efficiency are is presented, through the quality standard of shipyard and FEM heat transfer simulation. The ultimate purpose of line heating is the automation, so in case of plates which need weaving heating, the optimal heating condition suggested by this study can be used well in designing coil specifications of induction heaters which are heat input sources of new generation.

• ETRI Journal
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• 제34권2호
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• pp.199-209
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• 2012

In transport networks, a multi-ring architecture is very useful to facilitate network planning and to design and provide more resilient services for customers. Unlike traditional synchronous optical network multi-rings, the service resiliency of Ethernet-based multi-rings is significantly impacted by the ring hierarchy because a link or node failure in a certain level ring triggers filtering database flush actions in all higher level rings as well as in the ring with the failure, and consequently a large amount of duplicated data frames may be flooded. In this paper, we investigate how the ring hierarchy impacts the service resiliency of multi-ring networks. Based on extensive experiments on various single- and multiple-link failures, we suggest two effective inter-ring connection rules to minimize the transient traffic and to ensure more resilient multi-ring networks. In addition, we consider a flush optimization technique called e-ADV, and show that the combination of e-ADV and multi-ring structures satisfying our inter-ring connection rules results in a more attractive survivability performance.

• 제어로봇시스템학회논문지
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• 제17권10호
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• pp.1044-1050
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• 2011

The quality of brazing joints is one of the most important factors that have an effect on the performance of the brazing joint-based heat exchangers with the growing use in industry recently. Therefore, it is necessary to inspect the brazing joints in order to guarantee the performance of the heat exchangers. This paper presents a non-destructive method to inspect the brazing joints of the heat exchangers using X-ray. Firstly, X-ray cross-sectional images of the brazing joints are obtained by using CT (Computerized Tomography) technology. Cross-sectional image from CT is more useful to detect the inner defects than the traditional transmitted X-ray image. Secondly, the acquired images are processed by an algorithm proposed for the defect detection of brazing joint. Finally, two types of brazing joint are examined in a series of experiments to detect the defects in brazing joints. The experimental results show that the proposed algorithm is effective for defect detection of the brazing joints in heat exchangers.