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윤수용,곽관웅,이순걸,김창완 제어·로봇·시스템학회 2019 International Journal of Control, Automation, and Vol.17 No.6
Safety and stability of the unicycle robots are critical for their operation, and hence they must be tested for such aspects. However, the objectivity and repeatability of the tests cannot be guaranteed with human operators, and some tests under certain conditions cannot even be run at all due to the safety of the operator. To solve this problem, we propose an ATD (anthropomorphic test device) capable of reproducing the human rider’s behavior on the unicycle robot. An ATD is designed to have two prismatic joints to implement the change of center of gravity of the human operator in forward/backward and lateral direction. The reference profiles for two prismatic joints of the ATD that guarantee the same dynamic effect with the human rider’s behavior are designed using a cascade control loop in consideration of dynamic interaction between the reference trajectories and the unicycle robot dynamics. A sliding mode controller was designed and implemented to control the prismatic joints such that ATD mimics the human rider’s motion intent accurately and thereby the unicycle robot could be driven by the ATD as human operator drives. Feasibility of the proposed ATD was verified through computer simulations.
안면 표정 분석을 위한 Facial EMG 기반 주파수 특징을 이용한 합성곱 신경망
윤수용,원종호,민동진,김덕환 한국차세대컴퓨팅학회 2023 한국차세대컴퓨팅학회 학술대회 Vol.2023 No.06
fEMG는 안면 근육의 미세한 움직임을 감지하는 생체 신호이며 얼굴의 표정이나 감정을 측정하는 도구로서 연구되고 있다. fEMG 신호는 민감하여 잡음에 취약하며 이를 제거하기 위해 전처리가 필요하다. 본 논문에서는 fEMG 신호의 전처리와 합성곱 신경망 모델을 통한 안면 표정 분석을 진행한다. 원시 fEMG 신호를 20~450Hz 주파수 대역으로 대역 통과 필터링하고 60Hz에서 노치 필터링한 뒤, 이를 이용하여 안면 표정을 분석하는 합성곱 신경망 기반 모델을 제안한다. 제안한 2D 합성곱 신경망 모델은 기존에 제안된 머신러닝 기법인 LDA에 비해 8.27%p 더 높은 정확도를 보였으며, 비지도 LDA보다는 7.28%p 더 향상되었다. 실험 결과는 fEMG 신호를 사용한 2D 합성곱 신경망 기법이 안면 표정 분석에 효과적임을 보여준다.
뷰티살롱의 서비스질이 고객 만족에 미치는 영향에 관한 연구
윤수용(Yun Su Yong) 한국인체예술학회 2000 한국인체미용예술학회지 Vol.1 No.2
The extant study on customer satisfaction in the beauty salon has not been conducted yet. This study may be the first empirical study of customer satisfaction in the beauty salon. This paper explores empirically the effects of service quality on customer satisfaction in the service encounter of beauty salon, in addition to customers" service expectation. Also we try to answer the question, ""What is the major reason for the customer to show the service satisfaction toward specific beauty salon?"" By introducing service expectation and encounter service quality as new determinants of customer satisfaction, we have introduced a conceptual model with parsimony and higher explanatory adequacy. The results show that encounter technical service quality and functional service quality have direct effect on customer satisfaction as important factors. Technical service quality has been proved to be the most influential one when we regard the effect of the variables upon customer satisfaction. However, it should be emphasized that it is necessary to conduct encounter functional service quality, as well as technical service quality, to increase customer satisfaction.
윤수용(Yun, Soo-Yong),박지훈(Park, Ji-Hun) 대한건축학회 2014 大韓建築學會論文集 : 構造系 Vol.30 No.9
Monotonic and cyclic shear tests for bonded anchors and expansion anchors in concrete were conducted in order to investigate the influence of the concrete strength, crack width and loading protocol. Crack is induced artificially through the whole depth of concrete member in which anchors are installed and monitored during tests for cracked concrete. Based on the test result, characteristic strengths corresponding to a 5% probability of nonexceedance with a confidence of 90% and minimum strengths are obtained and compared with reference strengths including characteristic strengths in the technical approval of each anchor and design strength based on domestic design codes. In addition, anchor displacements at the reference strengths are interpolated from load-displacement curves, and appropriate reference strengths is proposed for anchor design that can limit the anchor displacement.
MANET 환경에서 노드의 연결성을 고려한 그리드 기반 라우팅 기법
윤수용(Soo-Yong Yoon),김재구(Jae-Gu Kim),임종태(Jongtae Lim),이석희(Seok-Hee Lee),복경수(Kyoungsoo Bok),유재수(Jaesoo Yoo) 한국콘텐츠학회 2014 한국콘텐츠학회논문지 Vol.14 No.11
본 논문에서는 모바일 애드혹 네트워크에서 라우팅 비용 감소를 위해 위치 정보를 이용한 효율적인 그리드 기반 라우팅 기법을 제안한다. 제안하는 기법은 헤더를 두지 않기 때문에 헤더 관리 비용이 감소하며 모든 노드가 메시지를 전송할 수 있다. 중간 노드들은 노드와 그리드간의 위치 관계에 기초하여 메시지를 중계하는 다음 홉을 결정한다. 각 그리드 영역의 좌표와 이웃 노드의 정보를 활용하여 노드의 방향성을 고려한 라우팅 경로 탐색을 한다. 또한, 노드들 사이의 연결성을 고려하여 라우팅 경로를 유지한다. 제안된 라우팅 기법의 우수성을 보이기 위해 성능평가를 통해 기존의 그리드 기반 라우팅 기법과 메시지 오버헤드, 전달 성공률을 비교한다. In this paper, we propose an efficient grid based routing scheme using the location information in order to reduce the routing cost in mobile ad-hoc networks. In our proposed scheme, all nodes can be a candidate to forward messages to the specified destination node and reduce the management cost of head nodes because they do not exist. The intermediate nodes determine the next hop relaying messages on the basis of location relations between a node and a grid zone. The proposed scheme explores the routing path considering the direction of a node using the coordinate of a grid zone and neighbor node information. It also maintains the routing path considering connectivities among the nodes. In order to show the superiority of the proposed routing scheme, we compare it with the existing grid based routing scheme in terms of the overhead of message, the success rate of transmission.