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김성근,고유봉 제주대학교 해양연구소 1997 해양자원연구소연구보고 Vol.21 No.-
A concept system is an abalone-bleeding farm in underwater. The design of system was performed based on the basic dimension obtained from maintenance. environment. etc and then the basic dimension was determined to length = 10m. breath = 10m and draft = 1m. In this paper, an exciting force of environment of the system was made an estimate by a general equation and a simplified experimental equation. The estimation of fluid dynamic forces of underwater cage system were used the three dimensional source distribution method. The experiment model(1/4model) was conceptually designed as biological characteristics. experiences. etc. The experiment in real sea was conducted for the 1/4 model. The object of experiment was to hold the underwater system by a typhoon in summer and a north-west wind in winter around Cheju Island. Korea. On the basis of this, it was used to the mooring method combined with the tension leg platform type and the conventional Type.
An Experimental Study on the Thermal Performance of Cement Mortar with Granulated PCM
Jeong, You-Gun,Park, Ki-Bong,Lee, Han-Seung The Korean Institute of Building Construction 2012 한국건축시공학회지 Vol.12 No.5
In this study the thermal performance of G-PCM replaced for find aggregate in mortar specimens was evaluated using TG-DTA. As a result, it was found that when solid changed into liquid, it absorbed heat, and when liquid changed into solid, it radiated heat. In addition, the fluidity and the compressive strength of mortar with G-PCM can be applied to the floor mortar and a wall finish material. Also the higher the replacement ratio, the larger the latent heat capacity. It was found that the mortar with G-PCM slowed the increase and decrease of temperature. Thus, the duration of pleasant indoor temperature is extended by the floor and wall mortar with G-PCM. In conclusion, G-PCM is expected to reduce the heating energy consumption.
Lee, Gun-You,Oh, Myung-Suck,Kim, Sang-Bong Korean Society for Precision Engineering 2003 International Journal of the Korean Society of Pre Vol.4 No.6
This paper presents development of a high speed rotating arc sensor system using a microprocessor based controller with tracking function for a complicate curved fillet welding line, The welding tip connected to the torch body is eccentrically positioned from the centerline of the torch, The area during one rotating cycle is divided into 4 regions of front, rear, right and left in welding direction of the torch tip to determine the horizontal deviation between the welding seam and the torch position. The average value at each region is calculated using the regional current values and a low pass filter incorporated with the moving average method is implemented. The effectiveness of the developed system is proven through the experimental results for several kinds of complicate curved fillet welding lines.
격자형 용접선 추적을 위한 용접 이동로봇의 모델링 및 제어
이근유(Gun You Lee),서진호(Jin Ho Suh),오명석(Myung Suk Oh),김상봉(Sang Bong Kim) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.4
This paper presents the motion control of a mobile robot with are sensor for lattice type welding. Its dynamic equation and motion control method for welding speed and seam tracking are described. The motion control is realized in the view of keeping constant welding speed and precise target line even though the robot is driven along a straight line or corner. The mobile robot is modeled based on Lagrange equation under nonholonomic constraints and the model is represented in state space form. The motion control of the mobile robot is separated into three driving motions of straight locomotion, turning locomotion and torch slider controls. for the torch slider control, the proportional integral derivative (PID) control method is used. For the straight locomotion, a concept of decoupling method between input and output is adopted and for the turning locomotion, the turning speed is controlled according to the angular velocity value at each point of the corner with range of 90 constrained to the welding speed. The proposed control methods are proved through simulation results and the results have proved that the mobile robot has enough obility to apply the lattice type welding line.