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CPG 를 이용한 ZMP 기반 이족 로봇의 무릎 핀 보행 궤적 생성
정승현(Seunghyun Chung),박종현(Jonghyeon Park) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
What this thesis suggests is the combination of CPG neural networks and trajectory for Stretched knee walking of the base body. Instability when a foot swings during SSP and when the center of mass moves to another point was decreased by calculating the real ZMP coordinate with the slope of the base body with respect to the pivot point. Recently, the research about biped robot with CPG has been being investigated. The biggest merit of the CPG is that it can get stable walking posture overcoming uncertain disturbance in certain range since each CPG unit draws limit cycle, the movement can be stabilized. The neural network among CPGs also connects the walking posture smoothly. So, this thesis applied CPG model only to each pitch direction of waist and knees. Inverted pendulum model and waist pendulum model are used for generating joint and pitch torque. As a result, the singularity problem of two links has been solved.
( Seunghyun Jung ),( Young Mee Ahn ),( Byoung Jun Lee ),( Keun Bum Chung ),( Hayoun Lee ),( Ha-kyeong Won ),( Jin Hwa Song ),( Yeonkyung Park ) 대한결핵 및 호흡기학회 2019 대한결핵 및 호흡기학회 추계학술대회 초록집 Vol.127 No.-
Purpose: Idiopathic pulmonary fibrosis (IPF) is a chronic, progressive, fibrosing interstitial lung disease of unknown cause with a high risk of rapid progression and mortality. Previous case-control studies have been reported that exposure of cigarette smoking, metal dust, wood dust, stone dust/sands and livestock industry were associated with IPF development which performed in United states, United Kingdom, Japan, Egypt, Southern Europe and South Korea but no meta-analysis present. Therefore, we conducted the systematic review and meta-analysis to evaluate the risk factor of IPF. Methods: We searched Medline, EM-BASE and Cochrane library from the earliest record to January 2019 for case-control studies of occupational or environmental exposure, job and IPF. Results: From 2,025 relevant records, 10 studies were included. Tobacco as an occupational exposure in 5 studies (RR 1.28, 95% CI 1.02-1.60) and history of ever smoking in 8 studies (RR 1.27, 95% CI 1.04-1.55) increased the risk of IPF. Any occupational or environmental exposures history of metal (RR 1.75, 95% CI 1.29-2.37), wood (RR 1.94, 95% CI 1.32-2.85), fabric/textile (RR 1.44, 95% CI 1.05-1.98), insecticide/pesticide (RR 2.30, 95% CI 1.32-4.02) and organics (RR 1.60, 95% CI 1.13-2.26) were associated increasing risk of IPF. Job history of carpentry/wood work (RR 1.56, 95% CI 1.01-2.41) and farming/agriculture (RR 1.65, 95% CI 1.25-2.18) increased the risk of IPF. Conclusions: Smoking history and any occupational exposures of tobacco increased the risk of IPF. For occupational or environmental exposure, metal, wood, fabric/textile, insecticide/pesticide and organics was associated with IPF. Job history of carpentry/wood work and farming/agriculture increased the risk of IPF.
BREW 무선 단말 플랫폼에서의 Mobile Game 구현
남승현(Seunghyun Nam),이돈혁(Donhyuk Lee),오진욱(Jinwook Oh),정현진(Hyunjin Chung),김대원(Daewon Kim) 한국멀티미디어학회 2006 한국멀티미디어학회 학술발표논문집 Vol.2006 No.2
본 논문에서는 모바일 플랫폼 및 게임시장의 현재 동향을 고찰 해보고, 모바일 플랫폼 중퀄컴사에서 제작한 BREW로 모바일 게임을 제작한 내용을 보고한다. 모바일 플랫폼을 BREW로 선택하고, C언어를 이용하여 제작한 ‘Mouse Hunter"는 핸드폰을 모든 연령층이 이용하고 있는 현 상황에서 신세대들에게는 요즈음 텔레비전에서 쉽게 접하는 “쥐잡기 게임”을, 기성세대들에게는 어렸을 적 오락실의 향수가 묻어있는 “두더지 게임’을 떠올리게 하여 소재와 게임방식의 거부감 없이 흥미를 유발 할 수 있도록 제작하였다.
박승현,정지연,유장진,이나루,유일재,송경석,이용학,한정희,김성진,박정선,정호근 한국산업위생학회 2001 한국산업보건학회지 Vol.11 No.3
The EDXRF(energy Dispersive X-ray Fluorescence Spec=trometer) technique was applied to the determination of heavy metals in welding fume. The EDXRF method designed in this study was a non-destructive analysis method. Samples were analyzed directly by EDXRF without any pre-treatment such as digestion and dilution. The samples used to evaluate such as digestion and dilution. the samples used to evaluate this method were laboratory samples exposed in a chamber connected with a welding fume generator. The samples were first analyzed using a non-destructive EDXRF method. The samples subsequently were analyzed using AAS method to verify accuracy of the EDXRF method. The purpose of this study was to evaluate the possibility of the non-destructive analysis of heavy metals in welding fume by EDXRF. The results of this study were as follow: 1. When the samples were collected under the open-face sampling condition, a surface distribution of welding fume particles on sample filters was uniform, which made non-destructive analysis possible. 2. The method was statistically evaluated according to the NIOSH(National Institute for Occupational Safety and Health) and HSE(Health and Safety Executive) Method. 3. The overall precision of the EDXRF method was calculated at 3.45% for Cr, 2.57% for Fe and 3.78% for Mn as relative standard deviation(RSD), respectively. The limits of detection were calculated at 0.46 ㎍/sample for Cr, 0.20 ㎍/sample for Fe and 1.14 ㎍/sample for Mn, respectively. 4. A comparison between the results of Cr, Fe, Mn analyzed by EDXRF and AAS was made in order to assess the accuracy of EDXRF method. The correlation coefficient between the results of EDXRF and AAS was 0.9985 for cr, 0,995 for Fe and 0.9982 for Mn, respectively. The overall uncertainty was determined to be ±12.31% , 8.64% and 11.91% for Cr, Fe and Mn, respectively. In conclusion, this study showed that Cr, Fe, Mn in welding fume were successfully analyzed by the EDXRF without any sample pre-treatment such as digestion and dilution and a good correlation between the results of EDXRF and AAS was obtained. It was thus possible to use the EDXRF technique as an analysis method of working environment samples. The EDXRF method was an efficient method in a non-destructive analysis of heavy metals in welding fume.
오일 파이프의 응력 및 변형거동특성에 관한 유한요소해석
조승현(Seunghyun Cho),김청균(Chung Kyun Kim) 한국트라이볼로지학회 2009 한국윤활학회지(윤활학회지) Vol.25 No.6
This paper presents the stress and displacement characteristics of oil pipe using the finite element analysis. Displacement in axial direction and von Mises stress of a pipe were analyzed with three design factors, which are the pipe thickness, the corrugation pitch and the corrugation height, under uniform oil pressure. The FE computed results are presented between a conventional round pipe and a rectangular pipe, which is manufactured in this study. The computed FE results show that maximum displacement in axial direction and von Mises stress of pipe are increased linearly as the oil pressure increases. Also, they are increased linearly as the corrugation pitch, corrugation height and pipe thickness increases. von Mises stress of a rectangular pipe at the edge increases sharply compared with that of a conventional round pipe. Therefore, the strength of rectangular pipe is superior to that of a conventional round pipe.