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Hyunsub Park,Junyoung Jung,Inhun Jang,Robert Riener 제어·로봇·시스템학회 2012 International Journal of Control, Automation, and Vol.10 No.5
This paper deals with a walking intent detection algorithm for paraplegic patients using a robotic exoskeleton walking assistant with crutches. User intent detection is one of the most important factors for a robotic exoskeleton to recognize a user’s intent regarding robot operation and in order to conduct proper operation. For a robotic exoskeleton walking assistant, walking intent detection means that the robot recognizes the best time to start walking behaviors and which behavior should be executed from the user’s intent. To enable this detection, an algorithm derived from a finite Moore Automaton for Robot Behavior (MARB) has been developed. Also, a walking stability criterion model is presented for use in the proposed algorithm as a trigger signal for walking. The proposed algorithm and the walking stability criterion modeling were verified using the robotic exoskeleton walking assistant, ROBIN.
송상훈 ( Sang-hun Song ),최원경 ( Wonkyung Choi ),박현섭 ( Hyunsub Park ),임병택 ( Byung Tack Lim ),박경란 ( Kyoung Ran Park ),김영현 ( Younghyun Kim ),박수진 ( Sujin Park ),손성길 ( Seong Kil Son ),이상민 ( Sang-min Lee ),강내규 대한화장품학회 2019 대한화장품학회지 Vol.45 No.2
인체 조직은 노화 현상을 겪으면 산화로 인한 손상이 진행되어 구조적인 변화가 일어나고 물성 저하를 겪는다. 피부가 겪는 노화 과정은 잘 알려져 있고 많은 평가가 수행되고 있지만 상대적으로 모발(머리카락)의 노화에 의한 평가는 잘 진행되어 있지 않아 모발의 노화를 케어하는 연구가 어려운 실정이다. 이에 본 연구는 모발의 노화 현상을 케어할 효능 기작을 적용할 수 있도록 노화된 모발 샘플을 제작하고 물성을 평가하여 안티에이징 효능을 확인하는 것을 목적으로 진행하였다. 먼저 내인성 노화가 진행된 모발의 지질량을 외인성 노화를 진행시킨 시료들과 비교한 결과, 펌 1회 처리 모발이 60대의 모발 지질량과 가장 유사함을 발견하였고, 이 모발을 통해서 원자 현미경으로 나노 스케일의 거칠기와 매크로 스케일의 인장강도를 평가하여 내인성 노화 모발과 유사한 물성 값을 가지고 있음을 확증하였다. 실제로 펌 처리를 통해 외인성으로 노화시킨 모발에 카르보디이미드와 펩타이드 결합을 적용하여 DSC로 구조적 변화와 거칠기 및 인장강도를 확인한 결과, 외인성 요인으로 노화된 모발을 에이징 이전의 상태의 물성 쪽으로 개선시키는 효과를 확인할 수 있었다. 뿐만 아니라 내인성 노화에 의해서 소실 된 내부 구성 성분을 프로폴리스를 이용하여 보강한 경우에도 외인성 노화가 유도된 모발의 물성이 에이징 이전 상태의 물성으로 회복되는 안티 에이징 효능이 발생함을 확인하였다. 본 연구에서 사용한 외인성 노화 유발 모발 시료 및 평가는 모발의 외인성 노화 연구에 유용하게 적용될 수 있음을 최초로 확인하였다. Human tissue undergoes aging by the oxidant damage via structural change and its physical properties. The skin aging process is well known and many evaluations have been conducted. However, studies on hair aging were relatively few and thus care for aging hair is difficult. This study aims to fabricate an aging hair and identify anti-aging effect with known ingredient in anti-aging. First of all, physical properties of aging hair of age 60s by physiologically intrinsic factors were compared to those of the hair made by various extrinsic factors such as several chemical reactions and iteration numbers of the treatments. The extrinsic aging hair of this study relates to the less amount of lipid and to the hair of perm treated once accordingly, wherein several physical properties, preferably comprise roughness and tensile strength, present a novel concept of the intrinsic aging hair. The penetration of peptide into the aging hair was leading the extrinsic hair towards more structurally directed a younger hair. In addition to the structural change, the penetration of the peptide enhanced texture and tensile strength of the aging hair. These patterns have been also found in addition of propolis. For the first time, these qualitative studies exhibit that indeed our extrinsic aging hair well describes the anti-aging efficacy as a receptor for a cross-linker and the ingredients of human hair.
Park, Jangyong,Kim, Minjoon,Kim, Hyunsub,Jung, Yunho,Kim, Jaeseok The Korea Institute of Information and Commucation 2016 Journal of communications and networks Vol.18 No.2
In this paper, we propose a low complexity multiple-input multiple-output (MIMO) detection algorithm with adaptive interference mitigation in downlink multiuser MIMO (DL MU-MIMO) systems with quantization error of the channel state information (CSI) feedback. In DL MU-MIMO systems using the imperfect precoding matrix caused by quantization error of the CSI feedback, the station receives the desired signal as well as the residual interference signal. Therefore, a complexMIMO detection algorithm with interference mitigation is required for mitigating the residual interference. To reduce the computational complexity, we propose a MIMO detection algorithm with adaptive interference mitigation. The proposed algorithm adaptively mitigates the residual interference by using the maximum likelihood detection (MLD) error criterion (MEC). We derive a theoretical MEC by using the MLD error condition and a practical MEC by approximating the theoretical MEC. In conclusion, the proposed algorithm adaptively performs interference mitigation when satisfying the practical MEC. Simulation results show that the proposed algorithm reduces the computational complexity and has the same performance, compared to the generalized sphere decoder, which always performs interference mitigation.
Near-ML MIMO Detection Algorithm With LR-Aided Fixed-Complexity Tree Searching
Hyunsub Kim,Jangyong Park,Hyukyeon Lee,Jaeseok Kim IEEE 2014 IEEE communications letters Vol.18 No.12
<P>In this paper, we propose a low-complexity multipleinput multiple-output (MIMO) detection algorithm with lattice-reduction-aided fixed-complexity tree searching which is motivated by the fixed-complexity sphere decoder (FSD). As the proposed scheme generates a fixed tree whose size is much smaller than that of the full expansion in the FSD, the computational complexity is reduced considerably. Nevertheless, the proposed scheme achieves a near-maximum-likelihood (ML) performance with a large number of transmit antennas and a high-order modulation. The experimental results demonstrate that the performance degradation of the proposed scheme is less than 0.5 dB at the bit error rate (BER) of 10<SUP>-5</SUP> for a 8 × 8 MIMO system with 256 QAM. Also, the proposed method reduces the complexity to about 1.23% of the corresponding FSD complexity.</P>
HILS를 이용한 HEV 버스용 HCU 검증에 대한 연구
박우성(Woosung Park),함형진(Hyeongjin Ham),진기창(Kichang Jin),김현섭(Hyunsub Kim),이형철(Hyeongcheol Lee) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
The HEV commercial bus system is being developed recently as a parallel hybrid system. The objectives of HEV commercial bus system such as the performance of vehicle, fuel economy, and reduction of emission are dependent on the supervisory control unit, HCU. Therefore, test of control algorithm of HCU is the most important part in developing HEV systems. The test of control algorithm should be conducted on a vehicle system, not a separate component. The test could be possible by a chassis dynamometer but it requires much time and costs. To get over this difficulty, the paper presents Hardware In The Loop Simulator (HILS) of the HEV commercial bus system for testing HCU by using dSPACE® HIL hardware. HILS is the quick and effective test method for real-time instead of actual test and enables more flexible design scenarios for configuration of hybrid system. It is because HILS includes electrical emulation of sensors and actuators, acting as the interface between the plant model and the actual HCU. Therefore, in the process of developing embedded system, HILS guarantees the safety and the less development time and cost. In the past decades, a lot of researches with HILS are conducted on the dynamics projects such as brake, engine control unit, and turbocharger in automotive systems. In these literatures, however, very few of these can be found regarding test on the hybrid system with HILS. Therefore, this paper proposes a new system test bench by HILS for the comprehensive test on the parallel HEV commercial bus system.
Development of 5 D.O.F Robot Hand for an Android robot
Dongwoon Che,HyunSub Park,Dong-Wook Lee,Jun-Young Jung,Ho-Gil Lee 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
In this paper, we propose 5 D.O.F robot hand for an android robot. A robot hand is the most complicated part in robot and it required many functions like grasping, detailed motion and so on. An android robot is one of humanoid robot but it required more similar appearance than one of humanoid robot thus, a hand of an android robot is required human like shape more than a hand of humanoid robot. The hand of android needs human like shape and complication, therefore it is difficult to develop a hand of an android robot. In this research, we develop a hand of an android robot which has 5 D.O.F fingers, human like shape and skin. Each finger has link structure driven by DC motor and worm gear. The finger is designed independent module structure so, hand is only combination of finger modules. This module structure gives small size, easy modification and convenience of maintenance. The skin is made of silicon complex material and it designed based on real human hand. The size of this hand based on standard size of Korean woman.
접근성이 용이한 멀티 라이브 스트리밍 커머스 시스템 구축 설계
이재경(JaeKyung Lee),정승환(SeungHwan Jeong),임현섭(Hyunsub Lim),임태훈(TaeHoon Lim),복찬용(Chanyong Bok),박상은(Sangeun Park),이상운(Sangun Lee) 한국방송·미디어공학회 2022 한국방송공학회 학술발표대회 논문집 Vol.2022 No.11
‘코로나19’의 여파로 인해 많은 분야에서 비대면 회의 및 상거래가 활성화되면서 기존 홈쇼핑에서의 방송 시스템 방식이 아닌 간단하게 구성할 수 있는 라이브 커머스의 중요성이 대두되었다. 시스템적으로 간편함을 갖춘 동시에 누구나 쉽게 접근을 할 수 있는 시스템을 구성하여 제안하고자 한다.