• 대한전기학회:학술대회논문집
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• 대한전기학회 1988년도 전기.전자공학 학술대회 논문집
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• pp.636-639
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• 1988

This paper suggests the operation performing the noise elimination of binary image. The image is read by the scanner. And operand is selected according to the size of input image. Through the Dilation and Erosion, elementary vector operation with selected operand, the noise of input image is eliminated.

• 한국통신학회:학술대회논문집
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• 한국통신학회 1988년도 추계학술발표회 논문집
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• pp.271-273
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• 1988

• 한국안전학회지
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• 제26권4호
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• pp.20-26
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• 2011

This paper is to investigate noise source for reciprocating type air compressors. The reciprocating type air compressors are widely used in the small and medium sized enterprise and many employees are affected and irritated by their noise during working. The investigation and analysis of the noise source were made according to the ISO 1680/1 and MIL-STD 7410-1 and noise evaluation of each part of compressors was made. Noise emitted from the intake and exhaust valve and the air receiver tank were dominant compared with those from other parts of compressor. Noise from the motor and the revolution of crank mechanism was negligible relatively with the noise sources as mentioned above.

• 한국정보통신학회논문지
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• 제15권12호
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• pp.2697-2704
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• 2011

조직 공학에서는 하이드로 젤 내 3차원 세포 배양 과정에서 세포와 세포간의 공생관계를 관찰하게 되는데, 시간이 경과함에 따라 세포들의 증가나 상호작용, 분화, 사멸되는 과정들을 고배율 공초점 현미경을 이용하여 단층 촬영하고, 촬영된 이미지들로부터 세포의 공생 메커니즘이나 변화 과정을 관찰 및 분석하기 위한 연구가 진행되고 있다. 본 연구에서는 하이드로 젤 내 3차원 세포 배양 과정에서 단층 촬영된 세포 이미지로부터 클러스터 경계선 정보를 추출하기 위한 수준별 잡음 제거 방법과 클러스터 경계선 추출 방법을 제안하였다. 실험을 통해 제안된 방법은 하이드로젤로 인한 좁쌀 모양의 잡음에 뛰어난 잡음 제거 성능을 보여 줄 뿐만 아니라 복잡한 클러스터들에 대해서 도 정확한 클러스터 경계선을 추출함을 보여 주었다.

• International Journal of Advanced Culture Technology
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• 제4권3호
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• pp.48-55
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• 2016

Conventional techniques for solving the noise problem have problems to generate different results, depending on the image size and weight values of the used masks, and they require many operations by using a complex formula. In this paper, we propose an image enhancement algorithm to solve the noise problem in a simple, yet easy-to-use way. For this purpose, we determined the difference between the noise of the two adjacent pixels for the horizontal and vertical, and for the two diagonal directions that each of the noise problem occurred, and then we got the average value of these pixel values. Then, we solve the noise problem by using the optimal average value in accordance with occurrence of the noise in the horizontal and vertical, and two adjacent pixels in a diagonal direction. As a result, we got the result that the noise solution in a simple, yet easy-to-use method to obtain a resultant image.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2007년도 제38회 하계학술대회
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• pp.533-534
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• 2007

This paper investigates impulsive noise from a pole transformer in low voltage distribution system for power line communication. EMI noise from the pole transformer is indicated from the experiment. The noise has certain characteristics because it is caused by partial discharge. The noise level is above -35dBm without a filter. Therefore, the filter which is made of ferrite is used in order to eliminate the noise. the noise filters should be applied to both the phase line and the neutral line. Otherwise, It is likely to have little overall impact on elimination of noises. the performance of filter is verified with various experiments. In conclusion, the equivalent circuit of power line communication including noise source is described as a lumped circuit.

• 전자공학회논문지S
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• 제34S권7호
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• pp.89-101
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• 1997

A technical method of noise modeling and adaptive filtering reducing of speckle noise in ultrasonic medical images is presented. By adjusting the characteristics of the filer according to local statistics around each pixel of the image as moving windowing, it is possible to suppress noise sufficiently while preserve edge and other significant information required in diagnosis. Homogeneous factor(HF) from the noise models that enables the filter to recognize the local structures of the image is introduced, and an algorithm for determining the HF fitted to the diagnostic systems with various inner statistical properties is proposed. We show by the experimented that the performance of proposed method is superior to these of other filters and models in preserving small details and suppressing the noise at homogeneous region.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 1996년도 추계학술대회논문집; 한국과학기술회관, 8 Nov. 1996
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• pp.98-103
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• 1996

Elimination of squeal noise generated during brake application is an important task for the improvement of comforts in vehicles. In this paper, the structure of the wet brake and its operation are described first, and the cause of the noise is analyzed by identifying how the factors such as torque, speed, oil pressure, lubricant, and friction material affect the noise. To verify the mechanism of generation of the noise, several experiments of brake applications are executed, Based upon the review on the technical papers and the results from the experiments, several solutions to reduce the noise, available in real applications, are suggested, and the feasibilities of them are confirmed through the applications to the current system.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2007년도 하계종합학술대회 논문집
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• pp.209-210
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• 2007

Obtained disparity map from the stereo camera by using the several stereo matching algorithms carries lots of noise because of various causes. In our approach, mode filtering and noise elimination technique using the histogram and projection-based region merging methods are adopted for improving the quality of disparity map and image segmentation. The proposed algorithms are implemented in VHDL and the real-time experimentation shows the accurately divided objects.

• 한국소음진동공학회논문집
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• 제20권12호
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• pp.1147-1152
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• 2010

The wet brakes used in an industrial forklift often produce noise on braking. Elimination or reduction of this squeal noise is an important task for the improvement of comforts. In this paper, a test rig was developed which was possible for testing of brake noise and an experimental measurement on squeal noise was performed. The causes of the brake noise are identified by experimenting how the factors such as automatic transmission fluid, the groove of friction-plate pad and the material of friction-plate pad affect the squeal noise. In order to identify the squeal characteristics, the signal analyses for noise are performed by using frequency spectrums. Experimental results showed that the viscosity of automatic transmission fluid and the groove pattern of friction-plate pad largely affect the reduction of the wet brake squeal noise in an industrial forklift.