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이호용(HoYung Lee),장율(Yul Jang),류상환(Sang-hwan Ryu),조홍식(HongShik Cho),서명원(MyungWon Suh) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
K-AGT Bogie is a rail car with rubber wheels while common rail Bogie has a iron wheel, and side guide type. so K-AGT has more contact between side guide rail and guide wheel than common rail. It is generated by vibration and friction through the contact. In this study, we make the improvement guide of two types (Spring and Rubber Type) and test. Test was performed with 3 Types of Original, Spring and rubber type and at a speed of 5 steps (30㎞, 50㎞, 60㎞, 70㎞, 80㎞). Sensor was attached to the guide, front part and rear part. In the result, RMS. value was reduced about 12% and natural frequency of car body about 20㎐ did.
다중 사용자 방향전환보행을 위한 강화학습 기반 리셋 컨트롤러
이호정(HoJeong Lee),전상빈(Sang-Bin Jeon),조용훈(Yong-Hun Cho),이인권(In-Kwon Lee) 한국HCI학회 2023 한국HCI학회 학술대회 Vol.2023 No.2
방향전환보행 (Redirected Walking: RDW) 기술의 리셋 (reset) 컨트롤러는 사용자의 보행 방향을 명시적으로 강제 전환시키는 기술이다. 리셋은 물리공간의 경계 혹은 다른 사용자와의 충돌을 막고 가상공간을 계속 보행할 수 있게 해준다. 그러나 너무 잦은 리셋은 사용자의 몰입감과 현존감을 저하시킨다. 따라서 이러한 현상을 줄이고자 리셋에 의해 전환된 보행 방향은 미리 정해진 규칙에 따르거나, 주어진 환경에 최적화된 방향이 선택될 수 있다. 리셋 컨트롤러에 대한 기존의 최적화 연구는 오직 단일 사용자에 대해 이루어졌다. 본 연구는 다양한 장애물이 있는 환경에서 최적의 리셋방향을 결정하는 다중 사용자 리셋 컨트롤러(Multi-user Reset Controller: MRC)를 제안한다. MRC는 주어진 환경에서 사용자 수 및 장애물 수가 변동되더라도 개별 에이전트 (agent) 가 최적의 리셋 방향을 선택하도록 다중 에이전트 강화학습(Multi-Agent Reinforcement Learning: MARL)으로 학습된다. 시뮬레이션 실험을 통해 우리의 방법은 기존 리셋 컨트롤러와 비교하여 주어진 환경에서 향상된 성능을 보였다.
한국형 고무차륜경량전철시스템(K-AGT) 신뢰성평가 연구
이호용(Ho-Yong Lee),이안호(An-Ho Lee),조홍식(Hong-Shik Cho),홍재성(Jai-Sung Hong),한석윤(Seok-Youn Han) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.11
Korea Railroad Research Institute(KRRI) developed the Driverless Rubber Tired Korea-AGT (Model: K-AGT) from 1999 to 2004. We have finished the safety and performance tests of K-AGT, but the reliability test result was not effective level. In the paper, analyzed whether can improve in this research through authoritativeness growth analysis to get satisfied result. Data obtained from this testing can be used to evaluate the growth of reliability. The most widely used traditional growth tracking model5 is included as IEC International standard. In this paper, we demonstrated reliability analysis using growth model of driverless rubber tired K-AGT system to prove reliability of development system. Therefore, we introduce the well-known NHPP model and analyze a reliability growth using ReliaSoft's RGA software.
SiNx / 고분자 이중층 게이트 유전체를 가진 Zinc 산화물 박막 트랜지스터의 저온 공정에 관한 연구
이호원(Ho Won Lee),양진우(Jin Woo Yang),형건우(Gun Woo Hyung),박재훈(Jae Hoon Park),구자룡(Ja Ryong Koo),조이식(Eou Sik Cho),권상직(Sang Jik Kwon),김우영(Woo Young Kim),김영관(Young Kwan Kim) 한국유화학회 2009 한국응용과학기술학회지 Vol.27 No.2
Oxide semiconductors Thin-film transistors are an exemplified one owing to its excellent ambient stability and optical transparency. In particular zinc oxide (ZnO) has been reported because It has stability in air, a high electron mobility, transparency and low light sensitivity, compared to any other materials. For this reasons, ZnO TFTs have been studied actively. Furthermore, we expected that would be satisfy the demands of flexible display in new generation. In order to do that, ZnO TFTs must be fabricated that flexible substrate can sustain operating temperature. So, In this paper we have studied low-temperature process of zinc oxide(ZnO) thin-film transistors(TFTs) based on silicon nitride (SiNx) / cross-linked poly-vinylphenol (C-PVP) as gate dielectric. TFTs based on oxide fabricated by Low-temperature process were similar to electrical characteristics in comparison to conventional TFTs. These results were in comparison to device with SiNx / low-temperature C-PVP or SiNx / conventional C-PVP. The ZnO TFTs fabricated by low-temperature process exhibited a field-effec mobility of 0.205 cm2/Vs, a thresholdvoltage of 13.56 V and an on/off ratio of 5.73 x 106. As a result, We applied experimental for flexible PET substrate and showed that can be used to ZnO TFTs for flexible application.
이호용(Lee Ho-Yong),류상환(Ryu Sang-Hwan),조홍식(Cho Hong-Shik),조봉관(Cho Bong-Kwan),장률(Jang Yul) 한국철도학회 2008 한국철도학회 학술발표대회논문집 Vol.- No.-
The K-AGT test line is managed similarly to revenue operation and operated automatically 120km per day, total 90,000km from August 2004 to December 2007. To enhance reliability of developed system, maintenance information system based on RCM is applied. The maintenance program applied in test line is based on RCM which prevent a fault before it happens and a fault made in test line is analysed by reliability growth test. Vehicle system, power supply system, signalling system, track and infrastructure are built in test line and it is reviewed enhancing system performance and changing designs to commercialize through reliability growth analysis method.