• Proceedings of the Korea Society for Industrial Systems Conference
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• 1998.10a
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• pp.777-784
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• 1998

본 논문은 시간 혹은 주변의 상황에 따라 가변적으로 변화하는 교통량을 스스로 파악하여 효과적으로 제어할 수 있는 에이젼트를 설게하고 가상 실험을 하여 기존의 고정식 신호등과 비교 평가하였다. 대부분의 교통 신호등은 교통량의 변화에 능동적으로 대응하지 못하고 미리 설정해 놓은 시간에 따라 각 방향의 신호를 주고 있기 때문에 교통량의 변화에 적절히 대응하지 못하고 있다. 또한 급작스런 교통상황의 변화에 대응 할 수 없다. 이러한 문제점을 해결하기 위해 DTCA(Distributed Traffic Control Agent)가 설계되었다. DTCA는 교차로의 교통정보를 수집하여 신호등을 제어한는 정보로 활용하고, 인접 교통제어 에이젼트와 교신한면서 최적의 신호시간과 신호주기를 결정한다. DCTA는 시간대별, 요일별 교통과 통계를 수집, 분석한 데이터를 기초로 하고 현재 교통량을 동적으로 수집 그리고 주변의 상호제어 에이젼트와 정보를 교환하여 비정상적인 교통흐름을 대처할 수있다.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2019.11a
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• pp.184-187
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• 2019

본 논문에서는 영상에서 발생하는 주기적 잡음을 제거하기 위해 다양한 필터들을 이용하여 성능 비교 실험을 수행한다. 영상의 주파수 도메인에서 지역적으로 잡음이 발생하면 영상의 공간 도메인에서 주기적인 잡음이 발생한다. 우선, 영상을 주파수 도메인에서 잡음을 야기시키는 영역을 분석하여 해당 영역에 지역적으로 노치 필터를 적용한다. 이를 통해 영상의 원신호를 유지하면서 영상에서 발생했던 주기적 잡음을 제거함으로써 영상의 화질이 개선됨을 실험을 통해 검증했다. 또한 객관적 지표 비교를 통해 3 가지의 지역적인 노치 필터들의 성능을 비교하고 최적의 필터를 제시한다.

• Journal of the Korean Institute of Telematics and Electronics
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• v.14 no.2
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• pp.1-9
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• 1977

The waveform, power spectrum and optimal receiver structure for fast FSK are analysed. It is shown and verified experimentally that for the observation interval of two bit periods, the bit error rate is as good as that of PSK. At the same time, it is shown to have the advantage of narrower band width than PSK. In experiment, the FFSK signal is generated by using a binary transversal filter and a low pass filter.

• Journal of the Korean Society of Radiology
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• v.5 no.4
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• pp.179-187
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• 2011

This study statistically analyzed the difference of the stability of maintaining a respiratory period shown according to position and use of a device to search the tendency and usefulness of a device. The supine position showed better maintaining respiratory cycles than the prone position. The 85% of subjects who showed bad maintenance pattern of a respiratory cycle were significantly different pattern with using belly board. It could be said that there was a significant correlation between the maintenance of a respiratory cycle and relative index of respirational stability(p=0.044, kappa=0.607). The movement due to respiration was one of important considerations in the radiation therapy on chest, abdomen, and even pelvis. This study could contribute to the high quality radiation therapy by statistic analysis of respiratory signals and its application.

• Journal of the Korea Computer Industry Society
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• v.5 no.9
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• pp.1005-1016
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• 2004

The conventional traffic light loses the function of optimal traffic signal cycle. And so, 30-45% of conventional traffic signal cycle is not matched to the present traffic signal cycle. In this paper proposes electro sensitive traffic light using fuzzy rules which will reduce the average vehicle waiting time and improve average vehicle speed. This paper is researching the storing method of 40 different kinds of sensor input conditions. Such as, car speed, delay· in starting time and the volume of cars in the real traffic situation. It will estimate the optimal green time in the 10 different intersections using Intelligent fuzzy method. Computer simulation results prove that reducing the average vehicle waiting time and offset better than fixed signal method which doesn't consider vehicle length.

• Proceedings of the Korean Institute of Intelligent Systems Conference
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• 2007.04a
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• pp.421-428
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• 2007

This paper discusses a fitness of the control on intersection network using fuzzy analytic hierachy process. The validity of control of traffic signal on intersection is phase, cycle of intersection. But the aigent of traffic intersection network is relative of intersection article. Therefor the aigent of traffic network intersection is before intersection passing vechile number, delayed vechile number. Fuzzy analytic hierachy process clears the grade of validity of the fixed cycle time controller and adaptive fixed cycle time and fuzzy traffic controller and proposes a new control type a traffic signal by this fuzzy analytic hierachy process.

• Journal of Korean Society of Transportation
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• v.10 no.2
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• pp.43-54
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• 1992

전통적인 신호제어모형은 다음의 두가지 결점을 내포하고 있다. 신호현시의 방법을 적정화하는 점이다. Rouphail(1990)은 전통적으로 행해온 신호주기와 녹색시간분할의 적정화에서 더 나아가 현시방법(signal timing)과 좌회전의 문제를 동시적으로 적정화 시킬 수 있는 모형을 제시한 바 있다. 그러나 Rouphail의 모형은 4개 현시에 국한되었고 현시방법(또는 현시의 선택)도 대단히 제약적이었다. 본연구는 이러한 Rouphail의 모형을 실제상황 에 보다 일반성있게 적용할 수 있도록 확장하는 연구이다. 여기서는 현시방법(또는 선택하는 현시으 형태와 수)을 확대시키고 또 연속변수와 이산변수를 동시에 적정화시키는 혼합정수선형계획법을 적용한 컴퓨터 모형을 구성하고 이를 사례 지역에 적용하엿다. 분석결과는 본 모형이 Rouphail 모형과 비교할 때 현시방법의 선택문제에 있어서 뿐만 아니라 좌회전(비보호, 보호 또는 혼합적)현시의 처리에 있어서 훨씬 더 효율적임을 확인하였다.

• Journal of Korean Society of Transportation
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• v.20 no.2
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• pp.135-148
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• 2002

In this paper, a queue length calculation algorithm using image detectors has been proposed. The algorithm produces the queue length using a pair of image detectors installed both on upstream and on downstream of a corridor. In addition, a new framework for controlling the traffic signal system based on queue length has been presented. More specifically, the scheme of determining the cycle time and green split using the queue lengths has been proposed. To validate the results, a simulation study was conducted with a network environment. Results showed that the proposed method gave better operational performance than a traditional method. However, additional validation effort is necessary in order to apply the real traffic conditions.

• Korean Journal of Optics and Photonics
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• v.33 no.1
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• pp.11-21
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• 2022

We have investigated the optimal design of an aperiodic optical phased array (OPA) for use in light detection and ranging applications. Three optimization algorithms - particle-swarm optimization (PSO), a genetic algorithm (GA), and a pattern-search algorithm (PSA) - were employed to obtain the optimal arrangement of optical antennas comprising an OPA. The optimization was performed to obtain the minimal side-lobe level (SLL) of an aperiodic OPA at each steering angle, using the three optimization algorithms. It was found that PSO and GA exhibited similar results for the SLL of the optimized OPA, while the SLL obtained by PSA showed somewhat different features from those obtained by PSO and GA. For an OPA optimized at a steering angle <45°, the SLL value averaged over all steering angles increased as the angle of optimization decreased. However, when the angle of optimization was larger than 45°, low average SLL values of <13 dB were obtained for all three optimization algorithms. This implies that an OPA with high signal quality can be obtained when the arrangement of the optical antennas is optimized at a large steering angle.

• Journal of the Institute of Electronics Engineers of Korea CI
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• v.40 no.4
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• pp.181-192
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• 2003

Increased vehicles on the restricted road, the conventional traffic light to losses the function of optimal cycle. The conventional traffic light dose not consider passenger car unit ,offset, and length of traffic intersection. As a result, 30~45% of conventional traffic cycle does not match the present traffic cycle. In this paper, we study the disard vantage of conventional traffic light and improve the vehicle average waiting time in the traffic intersection and vehicle average speed using fuzzy logic. Moreover, it will be able to forecast the optimal traffic information, road under construction and dangerous road using internet.