• The Journal of the Korea Contents Association
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• v.10 no.10
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• pp.456-463
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• 2010

This study measured the relative efficiency and productivity change of the Korean professional sport teams using DEA model and Malmquist Index for 2006-2009. The main results of this study can be summarized as follows. First, in case of efficiency of CCR for 2006-2009, the number of efficient professional sport teams(CCR value is one) are two(Daejeon Citizen, Incheon United), three(Daejeon Citizen, Incheon United, FC Seoul), two(Daejeon Citizen, Incheon United), three(Kyungnam FC, Incheon United, FC Seoul) respectively. Second, Malmquist Index representing productivity change for 2006-2009 are 1.035, 0.9658, 1.5331 for Kyungnam FC, 1.2514, 0.8948, 0.9056 for Daegu FC, 1.1768, 0.8620, 0.9722 for Daejeon Citizen, 0.9368, 1.2609, 0.7714 for Incheon United, 1.0000, 1.0000, 1.0000 for FC Seoul, respectively. This result will be used by inefficient professional sport teams to improve inefficiency.

• Journal of Convergence Society for SMB
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• v.6 no.3
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• pp.29-35
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• 2016

This paper presents the design of a user authentication system (DCIAS) using the device constant information. Defined design a new password using the access device constant information to be used for user authentication during system access on the network, and design a new concept the user authentication system so that it can cope with the threat required from passive replay attacks to re-use the password obtained in other applications offer. In addition, by storing a password defined by the design of the encrypted random locations in the server and designed to neutralize the illegal access to the system through the network. Therefore proposed using the present system, even if access to the system through any of the network can not know whether any where the password is stored, and if all right even stored information is not easy to crack's encrypted to neutralize any replay attacks on the network to that has strong security features.

• Language and Information
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• v.4 no.1
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• pp.1.2-8
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• 2000

76) $\ldots$[YP $neg_i\;\ldots\;t_i-[f\ldots*(\gamma)\ldots$] (1)=문부정 이동; (2)‘비선택적 결속’(unselective binding) 77) a. 초점운용자(초점 의존적 불변화사)의 통사적 성격을 동일하나, 형태론적 성격은 다를 수 있다. i. 문부정 - 문부정에 의해 결속되는, 하나 이상의 초점 혹은 의문 초점이나, 하나의 양화사를 포함하는 초점범주 ii. even(초점 의존적 불변화사) - even에 의해 결속되는, 하나 이상의 초점을 포함하는 초점범주 iii. 대조 영운용자 - 초점인 대조표지와 합쳐진 초점범주 b. 초점운용자의 의미는 운용자의 어휘적, 범주적 성격에 의거한다.

• Journal for History of Mathematics
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• v.20 no.4
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• pp.85-92
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• 2007

In this paper We study Some history and development of Geometry from the early 19th century to the late 20th century.

• Proceedings of the Korea Multimedia Society Conference
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• 2000.11a
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• pp.214-217
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• 2000

본 논문은 CCD카메라 얼굴 영상에서 얼굴의 특징을 추출하여 사이버 캐럭터 그래픽에 적용시키는 것을 목적으로 하고 있다. CCD카메라로는 촬영된 얼굴 영상에 기초적 영상 전처리를 실시한 후 불변모멘트의 일종인 센트럴모멘트를 사용하여 눈, 코, 입을 추출하였다. 제안된 방법으로 20명의 얼굴 사진을 대상으로 하여 추출 실험을 한 결과, 일반적인 실내 사무실 조명환경 하에서는 정확히 추출되는 것을 확인할 수 있었다.

• Proceedings of the Korean Society of Computer Information Conference
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• 2021.01a
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• pp.189-192
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• 2021

이 시스템은 블록체인의 분산 처리 방식을 활용하여 중앙 집중식 데이터베이스에서 사용자가 관리자의 보안 인프라에 의존할 수밖에 없는 점을 보완하고, 네트워크 독립성과 데이터의 불변성, 투명성을 보장한다. 본 논문에서는 기존의 중앙 집중식 데이터베이스의 단점을 보완하는 블록체인의 분산 데이터 저장 방식을 활용하여 블록체인의 해시 기법과 작업 증명, 탈중앙화, 합의 알고리즘을 구현한 암호화 시스템을 제안한다.

• Journal of the Korean Institute of Telematics and Electronics B
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• v.31B no.11
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• pp.116-123
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• 1994

A novel opto-digital pattern recognition method which has shift, rotation, and scale invariant properties is proposed for recognizing two dimensional images having straight lines. The algorithm is composed of three stages. In the first stage the line features of the image are extracted. The second stage imposes the shift, rotation, and scale invariant properties on the extracted features through normalizing procedure. The required normalizing equations are analytically explained. In the last stage, the artificial feedforward neural network is trained with the extracted features. In order to evaluated the proposed algorithm, nine different edge enhnaced binary images composed of straight lines are tested. Thus the proposed algorithm can recognize the patterns event though they are shifted, rotated, and scaled.

• Journal of the Korea Society of Computer and Information
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• v.15 no.10
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• pp.71-78
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• 2010

Even though various types of image segmentation methods have been extensively introduced, robustly segmenting images to environmental conditions such as illumination changes, shading, highlight, etc, has been known to be a very difficult task. To resolve the problem in some degree, we propose in this paper an environment-adaptive image segmentation approach using color invariants. The suggested method first introduces several color invariants like W, C, U, N, and H, and automatically measures environmental conditions in which images are captured. It then chooses the most adequate color invariant to environmental factors, and effectively extracts edges using the selected invariant. Experimental results show that the proposed method can robustly perform edge-based segmentation rather than existing methods. We expect that our method will be useful in many real applications which require edge-based image segmentation.

• Economic and Environmental Geology
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• v.52 no.1
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• pp.81-90
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• 2019

In this study, the effects of fracture tensor component and first invariant on block hydraulic behaviors are evaluated in the 2-D DFN(discrete fracture network) systems. A series of regression analysis is performed between connected fracture tensor components and block hydraulic conductivities estimated at every $30^{\circ}$ hydraulic gradient directions for a total of 36 DFN systems having various joint density and size distribution. The directional block hydraulic conductivity seems to have strong relation with the fracture tensor component estimated in direction perpendicular to it. It is found that an equivalent continuum approach could be acceptable for the 2-D DFN systems under condition that the first invariant of fracture tensor is more than 2.0~2.5. The first invariant of fracture tensor seems highly correlated with average block hydraulic conductivity and can be used to evaluate hydraulic characteristics of the 2-D DFN systems. Also, a possibility of upscaling using the first invariant of fracture tensor for the DFN system is addressed through this study.

• The Journal of the Acoustical Society of Korea
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• v.25 no.6
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• pp.305-311
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• 2006

In this paper the performance of a array invariant method is evaluated for source-range estimation in horizontally stratified shallow water ocean waveguide. The method has advantage of little computationally effort over existing source-localization methods. such as matched field processing or the waveguide invariant and array gain is fully exploited. And. no knowledge of the environment is required except that the received field should not be dominated by purely interference This simple and instantaneous method is applied to simulated acoustic propagation filed for testing range estimation performance. The result of range estimation according to the SNR for the underwater impulsive source with broadband spectrum is demonstrated. The spatial smoothing method is applied to suppress the effect of mutipath propagation by high frequency signal. The result of performance test for range estimation shows that the error rate is within 20% at the SNR above 10dB.