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조동수(Dongsoo Cho),신윤덕(Yunde Shen),기창두(Changdoo Kee) 한국자동차공학회 2005 한국자동차공학회 지부 학술대회 논문집 Vol.- No.-
A miniature humanoid robot was designed using a 3D CAD design software (CATIA V5), moreover its movement interference, gait stability and gait plan were analysed using a CATIA/DMU the Kinematics tool and a polysome dynamics specialized simulation software (ADAMS). The results show that the method can efficiently guide the design and development of humanoid robot.
적응형 PPF 제어기를 이용한 열린 박스 구조물의 능동진동제어
정환수(HwanSoo Chung),신윤덕(YunDe Shen),기창두(ChangDoo Kee) 한국자동차공학회 2004 한국자동차공학회 지부 학술대회 논문집 Vol.- No.-
The vibration of a structure quite often produces noise and sometimes makes the structure unstable. Especially, the vibration of lower frequency makes more serious effects to the structure. Therefore, it is necessary to reduce the vibration of a flexible structure. To do this end, I used the piezoelectric ceramics as the actuator, and the piezoelectric films as the sensor. By constituting the Adaptive Digital PPF controller which is one of the algorithms of adaptive control, the vibration of the first and second frequency of a open box and a Plate were reduced comparatively. PPF controller is used with being digitalized by DSP and implemented on the PC. The reliability of the proposed controller which can learn in the real time process is confirmed by experiment of applying to the structure.<br/> <br/>
[I.T.S.부문] 신경망 기법을 이용한 도로 영상의 사용 적합성 판별
백주현(Juhyun Baek),이준웅(Joonwoong Lee),기창두(Changdoo Kee) 한국자동차공학회 2001 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2001 No.11_1
This paper presents an MLP(Multi Layered Perception)-based image understanding algorithm to determine whether or not the image is corrupted by factors of noise in terms of the detection of lane marks. Such images in which lane marks are invisible even by human eye do not guarantee to provide a reliable lane-related information. For the MLP, the noisiness of image is set to three categories like "clear", "vague" and "non-clear", and the input vector to the MLP is obtained from an EDF(Edge Distribution Function). After training by back propagation rule, the MLP classifies an input image into one of three classes. The proposed algorithm is implemented to prove the performance with real images of road scene.
Micro-Structure Measurement and Imaging Based on Digital Holography
Kyeongsuk Kim,Hyunchul Jung,Hoseob Chang,Changdoo Kee,Naseem Akhter 한국비파괴검사학회 2010 한국비파괴검사학회지 Vol.30 No.3
Advancements in the imaging and computing technology have opened the path to digital holography for non-destructive investigations of technical samples, material property measurement, vibration analysis, flow visualization and stress analysis in aerospace industry which has widened the application of digital holography in the above fields. In this paper, we demonstrate the non-destructive investigation and micro-structure measurement application of digital holography to the small particles and a biological sample. This paper gives a brief description of the digital holograms recorded with this system and illustratively demonstrated.
김남성(Namseong Kim),박광호(Kwangho Park),기창두(Changdoo Kee) 대한기계학회 2001 대한기계학회 춘추학술대회 Vol.2001 No.9
This paper is presented 2-layer algorithm for tracking human faces in real time. The framework provides the structure which offers a means for automatic tracking initialization and reinitialization when environmental conditions momentarily deteriorate and cause the system to lose track of its target. When upper layer fails to track its object, lower layer helps it for tracking one continuously. In other words, lower layer allows the system to return approximate information on feature location or configuration.
Effect of viscosity-inducing factors on oxygen transfer in production culture of bacterial cellulose
SeongJun Kim,Hongxian Li,오일권,ChangDoo Kee,MyongJun Kim 한국화학공학회 2012 Korean Journal of Chemical Engineering Vol.29 No.6
Bacterial cellulose (BC) production culture requires high oxygen transfer rate (representatively kLa) at a low shear force. Considering that oxygen exhaustion is observed at the latter half of the exponential growth phase where BC production actually begins, it is highly probable that the drastic reduction of kLa (oxygen volumetric transfer coefficient)is caused by the drastic increase of the soluble and insoluble viscous materials. Therefore, we examined the apparent viscosity-inducing materials generated during BC culture and investigated their effects on kLa. Using the saccharified liquid from food waste as the culture medium, we discussed the relationship between the concentration of the generated solid matters, especially BC and the viscosity, the relationship between the BC concentration and kLa,and the correlation between the viscosity and kLa. The relationship between the solid matter (BC), which is the insoluble viscosity-inducing material, and kLa showed that the BC concentration and kLa were in exponentially reciprocal proportion with the linear regression equation. In case of using agar as the soluble viscosity-inducing material, the correlation between the viscosity and kLa showed that the viscosity depending on the agar concentration was in exponentially reciprocal proportion with kLa in both tap water and the saccharified liquid medium. The results indicated that the effect of the BC concentration on kLa was not great in the saccharified liquid medium. As the agar concentration increased in tap water and the saccharified liquid medium, the viscosity was increased and kLa was decreased gradually, showing a linear relation between the logarithm of the viscosity as agar and kLa. In conclusion, the effect of the soluble viscosity on kLa was greater than that of solid matter (BC). Also, it was suggested that the soluble viscosity-inducing matters like agar were rather more effective than kLa in BC production.
MATLAB/SIMULINK를 이용한 핀치 롤 유압실린더의 위치제어에 관한 연구
허준호(Junho Heo),김시습(Siseup Kim),김경수(Kyungsu Kim),기창두(Changdoo Kee) 한국자동차공학회 2009 한국자동차공학회 지부 학술대회 논문집 Vol.2009 No.10
The purpose of this paper is to design a PID controller for effective position control of hydraulic cylinder using MATLAB/SIMULINK. The hydraulic system consist of a hydraulic pressure source, a hydraulic servo valve, a double-acting hydraulic cylinder, a force sensor, a translational motion sensor, a load system, control logic. The simulation models were verified by comparing the error between input data and output data.