• Proceedings of the Korea Information Processing Society Conference
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• 2012.11a
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• pp.583-585
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• 2012

본 논문은 웹카메라를 이용하여 얼굴이 바라보고 있는 방향을 인식하는 시스템을 제안한다. 얼굴 검출 방법으로 Haar-like Face Detect를 이용하여 얼굴을 검출하고 전체 이미지에서 검출된 얼굴 영역만을 관심영역으로 설정하여 Haar-like Eye Detect를 이용하여 눈 영역을 검출하였다. 검출된 눈 위치에 대한 평균값으로 얼굴이 왼쪽 방향을 보고 있는지 오른쪽 방향을 보고 있는지를 판단하였다. 제안된 방법의 실험 결과, 얼굴 및 눈 영역을 비교적 정확하게 검출하였으며 계산된 눈 위치를 이용하여 얼굴 방향 인식에 대해서 우수한 성능을 보였다.

• Journal of KIISE
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• v.45 no.3
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• pp.211-223
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• 2018

In this paper, we propose a robot-centered direction relation representation and the relevant reasoning methods for indoor service robots. Many conventional works on qualitative spatial reasoning, when deciding the relative direction relation of the target object, are based on the use of position information only. These reasoning methods may infer an incorrect direction relation of the target object relative to the robot, since they do not take into consideration the heading direction of the robot itself as the base object. In this paper, we present a robot-centered direction relation representation and the reasoning methods. When deciding the relative directional relationship of target objects based on the robot in an indoor environment, the proposed methods make use of the orientation information as well as the position information of the robot. The robot-centered reasoning methods are implemented by extending the existing cone-based, matrix-based, and hybrid methods which utilized only the position information of two objects. In various experiments with both the physical Turtlebot and the simulated one, the proposed representation and reasoning methods displayed their high performance and applicability.

• The Journal of Korea Institute of Information, Electronics, and Communication Technology
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• v.9 no.2
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• pp.190-195
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• 2016

In this paper, we are comparative analysis both class method and proposal method in order to estimation of incident signal direction on uniform array antenna system. Proposal method of this paper decrease error probability for a signal direction of arrival estimation using maximum posterior probability estimator. If it decrease to signal estimation direction error probability, signal direction of arrival can correctly estimate. Through simulation, we were comparative analysis proposed method and class method. Also, we were comparative analysis about signal estimation error probability with increasing array antenna element. We show the superior performance of the proposed method relative to the class method to decrease of signal estimation error probability about 12%.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2007.06a
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• pp.717-720
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• 2007

This paper presents a novel scheme that quickly searches for the optimal direction of multiple directional antennas, and locks on to it for high-speed millimeter wavelength transmissions, when communications to another antenna directional are disconnected. The proposed method utilizes a modified genetic algorithm, which selects a superior initial group through preprocessing in order to solve the local solution in genetic algorithm. TDD (Time Division Duplex) is utilized as the transfer method and data controller for the antenna. Once the initial communication is completed for the specific number of individuals, no longer antenna's data will be transmitted nil each station processes GA in order to produce the next generation. After reproduction, individuals of the next generation become the data, and communication between each station is made again. In order to verify the effectiveness of the proposed system, simulation results of 1:1, 1:2, 1:5 directional antennas and experiment results of 1:1 directionalantennas confirmed the efficiency of the proposed method. The 16bit split is 8bit, but it has similar performance as 16bit gene.

• The Journal of Korea Institute of Information, Electronics, and Communication Technology
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• v.9 no.3
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• pp.291-297
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• 2016

In this paper, we are comparative analysis of exit algorithm and proposal algorithm for desired target direction of arrival estimation in correlation signal system. Proposed algorithm in this paper is to decrease target direction of arrival an estimation error probability using bayesian, maximum posterior, and MUSIC algorithm in order to decrease direction of arrival error probability as optimize and use linear constrained minimum variance to update weight value. Through simulation, we were comparative analysis proposed algorithm and exit MUSIC algorithm. In case SNR is 10dB and antenna element arrays are 9 and 12, We show the superior performance of the proposed method relative to the class method to decrease of signal estimation error probability about 11% and 13%, respectively.

• Proceedings of the Korean Information Science Society Conference
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• 2003.04a
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• pp.455-457
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• 2003

Pervasive 컴퓨팅은 다양한 분야에서 다양한 방향으로 연구가 진행 중에 있다. 제안된 모델 중에 CMU에서 제안한 위탁형 컴퓨팅 모델은 앞으로의 연구에 대한 한 방향을 제시하고 있다. 이 모델은 사용자가 요청하는 작업을 휴대하는 컴퓨터에서 처리하는 것이 아니라 주위에 뛰어난 성능을 가진 컴퓨터에게 작업을 위탁하는 방법이다. 이 방법은 기존 단말에서 작업을 처리하는 것에 비해 뛰어난 성능을 보이지만 위탁 컴퓨터에 의한 공격에 취약한 단점을 가지고 있다. 본 논문에서는 이러한 단점을 보완하기 위해서 Virtual Private Computing이라고 하는 개념을 제안 한다.

• Journal of Korea Multimedia Society
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• v.16 no.11
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• pp.1272-1280
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• 2013

In this paper, we propose an audio surveillance system which can detect and localize dangerous sounds in real-time. The location information about dangerous sounds can render a PTZ camera to be directed so as to catch a snapshot image about the dangerous sound source area and send it to clients instantly. The proposed audio surveillance system firstly detects foreground sounds based on adaptive Gaussian mixture background sound model, and classifies it into one of pre-trained classes of foreground dangerous sounds. For detected dangerous sounds, a sound source localization algorithm based on Dual delay-line algorithm is applied to localize the sound sources. Finally, the proposed system renders a PTZ camera to be oriented towards the dangerous sound source region, and take a snapshot against over the sound source region. Experiment results show that the proposed system can detect foreground dangerous sounds stably and classifies the detected foreground dangerous sounds into correct classes with a precision of 79% while the sound source localization can estimate orientation of the sound source with acceptably small error.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.33 no.5A
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• pp.526-535
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• 2008

Recently, several MAC protocols using the directional antennas have been proposed for wireless mobile ad hoc networks. In the theory, it can improve spatial reuse and communication throughput in the Mobile Ad-hoc networks. But, or However even though direction transmissions using the Directional MAC protocol(D-MAC) are expected to provide significant improvements, they causes other problems such as deafness problem and fairness problem. In this paper, we analyze the D-MAC protocol in Mobile Ad-hoc network for Vehicle to vehicle(V2V) communication. Through the results of the analysis, We the fundamental problem of D-MAC protocol and finally we suggest new D-MAC protocol for V2V networks.

• Journal of the Korean Geotechnical Society
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• v.26 no.11
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• pp.17-28
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• 2010

Vertical drains are commonly used to accelerate the consolidation process of soft soils, such as dredged materials, because they additionally provide a radial drainage path in a deep soil deposit. In practice, vertical drains are commonly installed in the process of self-weight consolidation of a dredged soil deposit. The absence of an appropriate analysis tool for this situation makes it substantially difficult to estimate self-weight consolidation behavior considering both vertical and radial drainage. In this paper, a new method has been proposed to take into account both vertical and radial drainage conditions during nonlinear finite strain self-weight consolidation of dredged soil deposits. For 1-D nonlinear finite strain consolidation in the vertical direction, the Morris (2002) theory and the PSDDF analysis are adopted, respectively. On the other hand, to consider the radial drainage, Barron's vertical drain theory (1948) is used. The overall average degree of self-weight consolidation of the dredged soil is estimated using the Carillo formula (1942), in which both vertical and radial drainage are assembled together. A series of large-scale self-weight consolidation experiments being equipped with a vertical drain have been carried out to verify the analysis method proposed in this paper. The results of the new analysis method were generally in agreement with those of the experiments.

• Proceedings of the KIEE Conference
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• 2011.07a
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• pp.1416-1417
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• 2011

킹크효과를 억제할 수 있는 새로운 f-모양 트리플게이트 구조를 가지는 다결정실리콘 박막트랜지스터는 추가적인 공정과정 없이 제안 및 제작되었다. 이러한 다결정실리콘 박막트랜지스터의 채널에는 순차적인 횡방향 고체화(Sequential Lateral Solidification, SLS)나 CW 레이져 횡방향 결정화(CW laser Lateral Crystallization, CLC) 등과 같은 방법으로 제작된 횡방향으로 성장시킨 그레인이 있다. 이 소자의 전체적인 전류흐름은 횡방향으로 성장시킨 그레인 경계에 강력하게 영향을 받는다. f-모양 트리플게이트에는 횡방향으로 성장시킨 그레인과 평행한 방향으로 위치한 채널, 그리고 수직인 방향으로 위치한 채널이 있다. 이 소자는 f-모양 게이트 구조에서의 비대칭 이동도를 이용하여 다결정실리콘 박막트랜지스터의 킹크효과를 효과적으로 억제시킬 수 있다는 사실을 실험과 시뮬레이션을 통해 검증되었다. 우리의 실험 결과는 이 논문에서 제안된 f-모양 트리플게이트 박막트랜지스터가 기존의 박막트랜지스터와 비교할 때 더 효과적으로 킹크 효과를 감소시킬 수 있다는 것을 보여주었다. 또한 고온 캐리어 스트레스 조건에서의 신뢰성도 개선할 수 있음이 확인되었다.