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mmWAVE Radar기반 공간 인식을 이용한 클러터신호 제거에 관한 연구
김원열,조형래,서동환 한국ITS학회 2019 한국ITS학회 학술대회 Vol.2019 No.04
최근 무선 통신의 발전으로 정확한 위치인식이 요구되는 다양한 응용 어플리케이션이 개발되고 있으며, 사람들은 실내 활동 시간의 증가 및 산업적 발전으로 인하여 위치기반 서비스에 의존성이 증가하게 되었다. 하지만 무선통신기 반 위치인식은 실내환경의 공간의 크기에 따라 벽이나 기둥과 같은 장애물에 의해 신호 감쇠가 발생하여 정확하게 추 정할 수 없다. 따라서 이 문제를 해결하기 위해 mmWave Radar기반 공간 인식을 이용한 클러터신호 제거 알고리즘을 제안한다. 제안한 알고리즘은 전처리시 공간에 대한 정보를 입력하는 방식이 아닌 자동으로 추출할 수 있도록 지도학 습기반의 ANN을 활용하며, 연산량을 감소시키고 정확도를 향상하기 위해 PCA를 이용하여 특징을 추출한다. 또한, 타 당성을 검증하기 위해 실내 공간 인식 성능 차이를 분석하였다.
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Welding and weaving speed estimation using acceleration sensor based on SVM
김원열,김종찬,서동환 한국마린엔지니어링학회 2017 한국마린엔지니어링학회지 Vol.41 No.10
The amount of heat applied to the welding part by the movement of the welding torch has a predetermined standard per unit area, according to the base material and the welding method. When the heat input is large, the cooling rate is slowed and the ductility is increased; however, as the hardness is decreased, the welding part is easily deformed by the residual stress. Further, if the amount of heat input is small, the weld zone tends to separate due to the lack of welding. Therefore, for a constant amount of heat to be applied to the weld, it is essential to measure the real-time moving speed, direction, and angle of the torch during welding. In this paper, we propose welding and weaving speed estimation system using an acceleration sensor based on the support vector machine (SVM). To measure the welding and weaving speeds, we analyze the obtained signal from the acceleration sensor in the frequency domain, based on the fast Fourier transform (FFT), and derive the feature vector. Based on this, we apply the SVM to improve the accuracy of low speed measurement by classifying the characteristics of the measurement signal according to the speed change. To verify the validity, we analyze the accuracy and error of the proposed algorithm according to the change in welding and weaving speed. The simulation result shows that the proposed method achieves an average positioning accuracy of 93.36% and a maximum positioning error of 0.3834 m.
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민중의 관점에서 바라본 문화대혁명 평등 지향의 민중 혁명을 중심으로
김원열 ( Kim Won Yeol ) 한국철학사상연구회 2003 시대와 철학 Vol.14 No.2
This thesis is written for the purpose to argue the Great Cultural Revolution is Minjung(labor, peasant)`s Revolution of Point to Equality. Until today studies on the Great Cultural Revolution have been based on a methode by the intellectuals‘ viewpoint for the most part. In contrast with it, I use an way of Minjung`s viewpoint. My arguements are this: The first, major contradictions between Minjung and Excutives stirred up the Great Cultural Revolution. The second, the Red Guards were avantcouriers in the Great Cultural Revolution, they were closely connected with Minjung`s Revolution. The third, the Great Cultural Revolution was not the Court a coup d`e´tat but Minjung`s Revolution. Especially Minjung make rapid progress from `an sich’ to `fu¨r sich‘ in the development of episteme. The fourth, the Great Cultural Revolution was the Continuous Revolution of Point to Equality. Therefore I conclude the Great Cultural Revolution is Minjung`s Revolution for class profits.
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김원백,이철경,이재천,서창열,Kim, Won-Baek,Lee, Cheol-Gyeong,Lee, Jae-Cheon,Seo, Chang-Yeol 한국재료학회 1998 한국재료학회지 Vol.8 No.10
Ni-W alloys containing 10 to 50wt% W were prepared by electrodeposition. Tungsten content in the alloy increased with current density. X-ray diffraction analysis revealed that the alloy was crystalline phase when deposited at current densities lower than 50mA/${cm}^2$. Their crystal structure transformed to amorphous at higher current densities. In terms of tungsten content, the crystal -+ amorphous transition occurred at 40-46wt% which was identified by the 3 fold increase in the width of a diffraction peak. The lattice parameter of crystalline phase increased with W upto 40wt% which is higher than the solubility limit of W (about 30wt%) in Ni. Therefore, the alloys are considered to be Ni solid solution supersaturated with W. The amorphous Ni-W alloys were recrystallized by annealing them at temperatures over $400^{\circ}C$. This was evidenced by the appearance a strong [ 11 11 annealing texture. The supersaturated W was precipitated during the annealing at over $800^{\circ}C$. The current-density dependence of W content and crystallinity was utilized to produce alternating layers of crystalline (30wt% W) and amorphous (50wt%) phases which may exhibit unique mechanical and corrosion properties. 10-50wt% 범위의 W을 함유하는 Ni-W 합금을 전기도금에 의해 제조하였다. 합금 중의 W 량은 전류밀도가 증가함에 따라 증가하였다. 전류밀도가 50mA/${cm}^2$이하인 경우 Ni-W합금은 미세한 결정립을 갖는 Ni의 고용체이었으며, 전류밀도가 50mA/${cm}^2$이상인 경우 비정질상으로 변화하였다. 이들의 결정질$\longrightarrow$비정질 천이는 W량이 40-46wt%인 구간에서 일어났으며 반각폭이 3배이상으로 증가하였다. 결정질 합금의 격자상수는 평형상태도 상의 W의 고용한계(약 30wt%)를 초과하는 40wt%까지 연속적으로 증가하는 것으로 나타나 Ni이 W을 과고용하고 있는 상태인 것으로 밝혀졌다. 비정질 Ni-W 합금은 $400^{\circ}C$이상의 온도에서 열처리하면 강한 [111]방향성을 가지며 재결정하였으며, $800^{\circ}C$이상의 온도에서는 과고용된 W이 석출하였다. 합금조성 및 결정구조의 전류밀도 의존성을 이용하여 Ni-30%W과 Ni-50%W 합금층이 반복되는 결정질/비정질의 다층도금을 제조하였다.
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김원열 ( Won Yeol Kim ) 한국철학사상연구회 2009 시대와 철학 Vol.20 No.3
This thesis is written for the purpose to contemplate genealogically on studies of the traditional confucian philosophy in Korea. In 1945, there were inheritances of japanese confucian studies, that is Hwangdo(皇道) Confucianism. After 8·15 Liberation, there were various studies on the traditional confucian philosophy in Korea. By the way scholars had an ideology under the Division-System in Korea. For example, scholars had an extreme Anti-Communism in South Korea, and scholars had a maximum Anti-Capitalism in North Korea. And northern scholars criticized the traditional confucian philosophy with the materialism and dialectic. After they did the studies, they made Juche Thought(主體思想) in succession. Comparatively southern scholars followed it with the idealism and metaphysics. But after Democracy Movement in 1987, young scholars criticized it with dialectic in South Korea. Therefore there are various studies in South Korea. However scholars had a problem about studies of the traditional confucian philosophy in South and North Korea, that was a biased viewpoint. I think that they must try to overcome the problem. For the upright study on the traditional confucian philosophy, scholars must have three rules. The first, we must understand social-economic bases of it. The second, we must criticize the problem of it. The third, we must scientifically change the method of it in the course of reinterpretation. If we study the traditional confucianism with three rules, we will come to a scientific conclusion about it.
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