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In this paper, after we investigate the influence of the arriving time difference on LTE-Advanced uplink MU-MIMO in Distributed Antenna System (DAS) environment, we suggest RRH selection and transmission time adjustment method for obtaining the receiving performance gain. DAS which is one of CoMP technologies has known as the most efficient technology for improving spectral efficiency and cell-edge...
Future mobile networks are converging towards being heterogeneous, owing to the co-existence of multi-tier networks within the same geographical area, including macro, pico- and femto-cells. The deployment of such networks is generally based on user demand, which is irregular and random, implying that the deployment of base stations (BSs) is random as well. As a result, analyzing the communication...
The O2 lance manipulator is used in the electric arc furnace (EAF) process to supply oxygen in order to remove impurities in molten metal. However, since it is controlled by the human operator who can get only visual information about the EAF, the collision between the lance and the EAF can happen which must be avoided in the process. The bilateral teleoperation can be a solution for this problem,...
This paper described a method to estimate the transfer function of the system by applying DFT(Discrete Fourier Transform) to obtained time series data, and also presented a controller design method. Major parameters included in output signal were estimated using DFT. In addition, using the estimated parameters, we estimated the transfer function of the system and designed a controller. A system model...
This paper deals with robust steering control of 2-DOF(Degree Of Freedom) bicycle model. 2-DOF bicycle model is specialized model for the steering control of vehicle. Even if the real vehicles have many system uncertainties such as nonlinearity and disturbance, the 2-DOF bicycle model have been generally used to algorithm development for the steering control of vehicles since the dynamics of the 2-DOF...
In this paper, we outline the Grid 2.0 Research, a collaborative Smart Grid research program between Gachon Energy Research Institute (GERI) of Kyungwon University and Bell Labs of Alcatel-Lucent. Salient features of the Grid 2.0 Research are the active role of distributed fixed and mobile energy storage, distributed renewable energy sources, and active load-side participation. Our focus is not on...
In this paper, we show the characteristics of the threshold-based IR-UWB location positioning system by experiment. We found that this system provides distance-dependent accuracy because the arrival time of the pulse is detected by threshold using 1-bit ADC (Analog to Digital Convertor). We also propose a simple compensation method based on measurement to improve positioning accuracy. The proposed...
This paper describes an in-flight camera platform geometric calibration method for aerial multi-head camera systems. The platform calibration parameters express the geometric relationship between camera heads and are estimated by means of a temporal geometric constraint in consecutive frames. The constraint used here is the relative geometry between camera heads that remains constant over time. This...
A study on new type of electrostatic suspension of silicon wafer, featuring ldquousing piezo actuators to control the positions of movable electroderdquo, has been reported. A novel aspect of this system is movable electrodes are used instead of stationary electrodes utilized in previous suspension system. By using a rapid deformation of the piezoelectric (PZT) actuator, the movement of the movable...
In this paper, we introduced a linear motor-based transfer system with an active PID controller which can be replaced with an automated guided vehicle (AGV) for the port automation. This system, which is named LMCTS(liner motor-based container transfer system), is based on PMLSM (permanent magnetic linear synchronous motor) which basically consists of stator modules on the rail and shuttle car. Therefore...
The effects of interfacial debonding and fiber volume fraction on the mechanical and thermal properties of brittle matrix composite material were studied by using finite element method. Representative volume element of uni-symmetric debonding was used for the modeling of fibers and matrix constituting the Nicalon/Glass composite and numerical results were compared with those in case of doubly-symmetric...
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