• 대한전기학회논문지
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• 제41권5호
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• pp.562-572
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• 1992

In this paper, we propose software algorithms which provide acceleration/deceleration characteristics essential to high dynamic performance at the transient states where industrial robots or CNC machine tools start and stop. Software acceleration/deceleration methods are derived from the mathematical analyses of typical hardware systems controlling acceleration/deceleration. These methods make servo motors, which drive axes of motion, start and stop smoothly without vibration in the repeated tools. The path error, which is one of the most significant factors in the performance evaluation of industrial robots or CNC machine tools, is analyzed for linear, exponential, and parabolic acceleration/deceleration algorithms in case of circular interpolation. The analyses show that path error consists of the distance between the required path and generated one through acceleration/deceleration, and that between the generated one through acceleration/deceleration algorithm and the actual one of the end effector of the industrial robot or tool of the CNC equipment.

• 한국방송∙미디어공학회:학술대회논문집
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• 한국방송공학회 2009년도 IWAIT
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• pp.719-722
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• 2009

The purpose of this paper is to develop a robot that moves independently, communicates with a human, and explicitly extracts information from the human mind that is rarely expressed verbally. In a spoken dialog system for information collection, it is desirable to continue communicating with the user as long as possible, but not if the user does not wish to communicate. Therefore, the system should be able to terminate the communication before the user starts to object to using it. In this paper, to enable the construction of a decision model for a system to decide when to stop communicating with a human, we acquired speech and motion data from individuals who were asked many questions by another person. We then analyze their speech and body motion when they do not mind answering the questions, and also when they wish the questioning to cease. From the results, we can identify differences in speech power, length of pauses, speech rate, and body motion.

• 한국방송∙미디어공학회:학술대회논문집
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• 한국방송공학회 2010년도 하계학술대회
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• pp.426-427
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• 2010

최근 휴대기기들의 CMOS 영상 센서의 사용으로 Rolling shutter에 의한 왜곡현상이 발생하고 있다. 이러한 왜곡현상을 보정하기 위한 기존의 방법은 동영상에서의 움직임 정보만을 주로 이용하고 있다. 따라서 본 논문은 움직임 정보를 이용한 보정의 성능을 더욱 좋게 하기위하여 정지영상에서 Rolling Shutter 왜곡현상에 대한 추가적인 움직임 정보를 찾아내고 보정하는 알고리즘을 제안하고 있다.

• 한국안전학회지
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• 제18권2호
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• pp.132-138
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• 2003

고속철도교량에서 장대레일의 사용은 연결부 근처에서 레일과 교량상판사이의 비선형 거동으로 인하여 부가적인 응력을 유발한다. 고속철도 교량의 지진응답해석에서, 구조물응답은 지반운동특성에 매우 영향을 많이 받으므로, 지반운동의 위치에 따른 변화가 구조물의 응답에 영향을 미치게 되고, 그 결과는 레일에 응력을 유발하게 된다. 또한 고속철도에서 사용지진 수준의 지진발생 시에 열차의 긴 제동거리가 필요하므로 열차의 안전한 정지를 확보하는 것이 요구된다. 이러한 관점에서 장대레일에 의해 부가적으로 발생하는 응력, 지반운동의 공간변화에 대한 구조물 응답의 영향, 그리고 안전하게 정지하기 위해 필요한 열차의 제동거리 등의 사항이 레일의 응력해석에 고려될 필요가 있다. 본 논문에서는 지진하중을 받는 고속철도교량의 장대레일 응력해석을 위하여 제동하중, 지반운동의 공간적 변화, 그리고 레일의 재료 비선형을 고려한 시간영역에서의 비선형 동적해석방법을 개발하고 적용하였다. 제시된 방법을 한국고속철도의 특정부지에 적용하여 지반운동의 공간변화에 따른 응답의 타당성을 보였다.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 1992년도 한국자동제어학술회의논문집(국제학술편); KOEX, Seoul; 19-21 Oct. 1992
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• pp.306-311
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• 1992

We propose software algorithms which provide the characteristics of acceleration/deceleration essential to high dynamic performance at the transient state where industrial robots or CNC machine tools start and stop. The path error, which is one of the most significant factors in performance evaluation of industrial robots and CNC machine tools, is analyzed for linear, exponential, and parabolic acceleration/deceleration algorithms in case of circular interpolation. The analysis shows that the path error depends on the acceleration/deceleration routine and the servo control system. In experiments, the entire control algorithm including the proposed acceleration/deceleration algorithms is executed on the motion control system with a floating point digital signal processor(DSP) TMS320C30 as a CPU. The experimental results demonstrate that the proposed algorithms are very effective in controlling axes of motion of industrial robots or CNC machine tools with the desired characteristics.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2002년도 하계종합학술대회 논문집(4)
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• pp.295-298
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• 2002

This paper presents a fast block-matching algorithm to improve the conventional Three-Step Search (TSS) based method. The proposed Comparison Fast Block Matching Algorithm (CFBMA) begins with DAB for adaptive search range to choose searching method, and searches a part of search window that has high possibility of motion vector like other partial search algorithms. The CFBMA also considers the opposite direction to reduce local minimum, which is ignored in almost conventional based partial search algorithms. CFBMA uses the summation half-stop technique to reduce the computational load. Experimental results show that the proposed algorithm achieves the high computational complexity compression effect and very close or better image quality compared with TSS, SES, NTSS based partial search algorithms.

• 한국통신학회논문지
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• 제22권4호
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• pp.706-713
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• 1997

In this paper, we propose a band stop filter(BSF) for reducing drag-like effect of the low pass filter(LPF), a block by block adaptive filtering method, and a motion adaptive filtering method, which show better results in terms of PSNR or human visual perception compared to the conventional method using LPF. The BSF improves the draglike effects of the low pass filter by passing temporal high frequency components of video sequences which correspond to objects with large motion. The proposed adaptive methods also improve the conventional adaptive filtering by modifying the conventional algorithm and applying the algorithms for small blocks. The simulation results show that the proposed filtering methods show better results in terms of PSNR and subjective tests in most cases. Also in case of block by block adaptive filtering, it is verified that the application of the algorithm for smaller block gives better results.

• 한국정보기술학회 영문논문지
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• 제8권2호
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• pp.139-145
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• 2018

Improvement of the speed of the gantry among equipment that mounts a chip using SMT can improve productivity. In order to improve the performance of the gantry, there are studies such as a method of increasing the speed of adsorption, the speed of the gantry by reducing the weight, and a method of facilitating the use of the gantry. But all of these are ways of improving equipment. In this paper, we propose a method to improve the speed of gantry mounting microchip. The method is to shorten the driving time of the gantry. To do this, calculate the driving time using the existing method. And we calculate the travel time using the method presented in this paper. As a result, the time calculated by the proposed method is reduced by 14%.

• 한국정보통신학회:학술대회논문집
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• 한국정보통신학회 2015년도 춘계학술대회
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• pp.866-869
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• 2015

본 논문은 자전거, 전동휠체어 등의 안전사고를 예방하기 위해 저가형 CW도플러 센서를 사용한 전방물체감지장치를 제안한다. 이를 위해 CW도플러 센서의 출력 신호를 분석하여 물체의 움직임을 감지하는 알고리즘 및 신호처리보드를 개발한다. 센서에서 출력되는 신호는 아날로그이며 I와 Q 나뉜다. 물체가 센서을 기준으로 접근, 정지, 이탈 할 경우 각각 I와 Q의 위상이 다르게 나타나는 특징을 이용하여 위상에 대한 정보를 판별, 물체의 움직임을 감지할 수 있는 알고리즘을 개발한다. 검증을 위해 MCU 하드웨어 및 알고리즘을 적용한 펌웨어 개발 후 실험을 통해 물체의 움직임에 따라 움직임 정보가 정상적으로 출력되는 것을 확인한다. 실험 결과, 물체의 움직임에 따라 감지정보가 출력되는 것을 확인하였으며, 알고리즘 및 신호처리보드의 동작을 검증하였다.

• 한국정밀공학회지
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• 제29권4호
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• pp.441-448
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• 2012

This paper describes the optimal home positioning algorithm of Eclipse-II, a new conceptual parallel mechanism for motion simulator. Eclipse-II is capable of translation and 360 degrees continuous rotation in all directions. In unexpected situations such as emergency stop, riders have to be resituated as soon as possible through a shortest translational and rotational path because the return paths are not unique in view of inverse kinematic solution. Eclipse-II is man riding. Therefore, the home positioning is directly related to the safety of riders. To ensure a least elapsed time, ZYX Euler angle inverse kinematics is applied to find an optimal home orientation. In addition, the subsequent decrease of maximum acceleration and jerk values is achieved by combining the optimal return path function with cubic spline, which consequently reduces delivery force and vibration to riders.