• Proceedings of the Korea Water Resources Association Conference
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• 2021.06a
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• pp.477-477
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• 2021

지구온난화로 인한 집중호우 및 태풍의 발생 횟수와 강도가 증가함에 따라 홍수피해가 증가하고 있으며, 특히 도로침수는 피해 측면에서 '복구-보상' 중심의 사후처리 체계에서 벗어나 '예방-대응-관리'를 통한 사전 재난대응 체계로 정책 전환이 요구되고 있다. 이에, 도로침수관련 재난정책의 기반기술이 될 수 있는 '도로침수 실시간 예측·감시 및 운영 기술'을 경상남도 진주시를 대상으로 침수피해 관련 지역현안을 해결하고자 하며, 강우예측자료를 활용한 침수해석, CCTV영상을 이용한 AI기반 실시간 침수감시, 공간 빅데이터 기반 침수정보제공, e-SOP 등 다양한 기술이 융합된 실증 연구로 이루어진다. 본 연구결과물이 실용화되어 도로침수통합관리시스템으로 운영된다면 지역 수재해 대응력 향상에 기여할 것으로 판단된다.

• Proceedings of the Korea Contents Association Conference
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• 2006.11a
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• pp.75-79
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• 2006

In a VoIP(Voice over IP) system which support the realtime speech service, speech quality is deteriorated by the delay, the jitter, the loss, and the reversed packet order. In this thesis, APBC for receiver site is proposed, which compensate the jitter by the adaptive playout algorithm and conceal the packet loss, and align the packet order. Also, a VoIP application system is implemented, and the performance of APBC is verified on the implemented system by measuring the processing speed and the speech quality. From the result, processing speed is 257$\mu$sec, which is fast enough to deal with packet being received in realtime. Also, the speech quality by MOS(Mean Opinion Score) is improved as 18 percent compared with algorithm of fixed playout delay.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.23 no.10
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• pp.1212-1215
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• 2012

This study describes the accuracy improvement of the estimated angle using phase averaging in phase-comparison monopulse algorithm. In addition, to compensate the time-delay due to the phase averaging, we propose the time-delay compensation algorithm which uses the derivative of the estimated angle. These derivative is calculated by the curve fitting method. Using the real radar interferometer, we have verified that the phase averaging and time-delay compensation algorithms are effective in real-time signal processing application.

• Proceedings of the Korea Information Processing Society Conference
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• 2014.11a
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• pp.24-25
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• 2014

최근 천재지변 및 여름철 전력난과 같은 예상치 못한 정전이 증가함에 따라 소규모 사업장 및 가정에서 무정전 전원공급장치에 대한 관심이 증대되고 있다. 기존의 무정전 전원공급장치는 정전 보상시간에 비례하여 높은 가격과 유지비용이 요구되며 사용자 편의성이 부족한 단점이 있었다. 본 논문에서는 무정전 전원공급장치 용량을 1/10 로 줄이고 부족한 정전보상시간을 늘리기 위하여 소형동기 발전기를 결합한 무정전 발전공급장치에 관한 설계 안을 제시한다. 제시한 발전공급장치는 Real-Time Operating System (RTOS) 기반의 제어기를 사용하여, 정전 발생시 순차적으로 무정전 전원공급장치와 소형 동기발전기를 동작시켜 전원을 공급한다. 또한 센서 네트워킹, 실시간 모니터링, 원격제어 등 다양한 실시간 서비스를 사용자에게 제공한다.

• 한국HCI학회:학술대회논문집
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• 2006.02b
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• pp.676-683
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• 2006

MMORPG (Massively Multiplayer Online Game) 상에서 플레이어들 간의 다양한 상호 작용은 플레이어들의 재미를 증가시키는 중요한 요소로 인식되고 있다. 그러나 MMORPG 상에서 게임 플레이어들 간의 상호 작용을 높여 재미를 증가시킬 수 있는 디자인 전략에 관한 실증적인 연구는 아직까지 진행된 바 없다. 따라서 본 연구에서는 상호 의존 이론 (Interdependency Theory)을 중심으로 과업의 상호 의존성과 보상의 상호 의존성이 플레이어들의 게임에 대한 재미와 몰입, 행동적 의도, 성과에 미치는 영향에 초점을 맞추어 실험을 실시하였다. 본 연구의 결과 플레이어들의 인지적 재미와 성과는 플레이어들 간 과업의 상호 의존성과 보상의 상호 의존성에 따라 다르게 나타나고 있음을 확인하였다. 이와 같은 실증적 연구 결과를 통하여 본 연구는 MMORPG 플레이어들 간의 상호 의존성에 대한 학술적이고 실용적 의의를 제공하고자 한다.

• Journal of Internet of Things and Convergence
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• v.10 no.2
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• pp.51-60
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• 2024

Aiming at the problem of low contrast and difficult to recognize video images in low-light environment, we propose an adaptive contrast compensation enhancement algorithm based on human visual perception. First of all, the video image characteristic factors in low-light environment are extracted: AL (average luminance), ABWF (average bandwidth factor), and the mathematical model of human visual CRC(contrast resolution compensation) is established according to the difference of the original image's grayscale/chromaticity level, and the proportion of the three primary colors of the true color is compensated by the integral, respectively. Then, when the degree of compensation is lower than the bright vision precisely distinguishable difference, the compensation threshold is set to linearly compensate the bright vision to the full bandwidth. Finally, the automatic optimization model of the compensation ratio coefficient is established by combining the subjective image quality evaluation and the image characteristic factor. The experimental test results show that the video image adaptive enhancement algorithm has good enhancement effect, good real-time performance, can effectively mine the dark vision information, and can be widely used in different scenes.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.20 no.4
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• pp.143-148
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• 2020

In the case of a system that detects and controls the phase of an alternating voltage, the analog control method compensates the phase offset part by filtering for the detected phase and applies it to the control. However, in the digital control method, precise control cannot be achieved due to an error between the operating frequency of the microprocessor or the microcontroller and the input phase time when controlled using such phase detection. In general, when the method used is a certain time, the accumulated error is compensated and adjusted at random. To solve this problem, a method of detecting a zero point in real time and compensating for the operating frequency of the microprocessor is needed. Therefore, the research to be performed in this paper to reduce these errors and apply them to precise digital control is as follows. 1) Research on how to implement Zero Crossing Detection algorithm through simulation modeling to compensate the zero point to match the operating frequency through detection. 2) A study on the method of detecting zero points in real time through the Zero Crossing Detection design using a microcontroller and compensating for the operating frequency of the microprocessor. 3) A study on the estimation of the rotor position of BLDC motors using the Zero Crossing Detection circuit.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.15 no.3
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• pp.1685-1690
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• 2014

This paper proposes a novel method to compensate for the measurement errors in detecting phase currents for vector-controlled inverter in real-time. The output torque equations for 3-phase induction motor are derived in terms of offset error and transducing gain error in current measurement circuits, and the equations shows that motor output torque has many ripples due to current measurement errors. Especially, if the proposed method is applied to vector-controlled inverter, the torque ripple by transducing gain error can be reduced in real-time at running state of motor. To verify the proposed method, it was applied to vector-controlled inverter for 3-phase induction motor of 200[W] and computer simulation and experimentation were carried out.

• Journal of the Korean Society for Nondestructive Testing
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• v.25 no.5
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• pp.356-361
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• 2005

A temperature-compensating double fiber Bragg grating(FBG) sensor having two different FBGs in one fiber line was proposed for real time measurement of mechanical normal strain in structures. Measurement of mechanical strains of the aluminum beam surface by the double FBG sensor was performed under various thermal conditions, and the results were compared with those of electrical resistance strain gage. The FBG sensor fabricated in this study was able to measure accurately the mechanical strains without containing any thermal strain component.

• Journal of Biomedical Engineering Research
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• v.19 no.1
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• pp.9-18
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• 1998

In this paper, we present the degradation of focusing induced by velocity inhomogeneity in human tissue. For simulation, the fatty layer which is the major factor of degradation for its lower velocity, is modeled as a uniform velocity perturbation layer. And we simulate the degradation of resolution resulting from change of beam path due to refraction and the time delay due to velocity difference. We show that focusing error can be compensated for considering the velocity inhomogeneity only. The proposed compensation method can be operated in real time in the presently used digital focusing systems.