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This paper validates the concept of receiving LTE MIMO signal to obtain spatial multiplexing gain with single radio beam switching antenna system that consists of a single active antenna with multiple parasitic elements around it. Performance measurements were conducted by using a testbed equipped with single radio. Test results with LTE signal have not been reported so far. Measured SNR of the recovered...
Single radio system can relieve the volume expansion that most MIMO schemes result in. The former studies presenting test results have focused on either single radio transmission or single radio reception, respectively. This paper presents test results validating the concept of single radio approach for realizing compact MIMO transceivers. Spatial multiplexing 2×2 MIMO transmission and...
High performance 20nm-node PCRAM cell switching was successfully realized with the remarkable Ion/Ioff characteristics employing low aspect ratio poly PN diode on metal. Nice Ion/Ioff ratio was obtained by modifying stack of diode adopted in-situ boron-doped poly SiGe and thermal optimization with spike RTA. Basically, boron has high solubility and activation rate in SiGe matrix. In-situ boron-doped...
This paper considers a design problem for time synchronized coverage control of cooperative mobile robots. The derived algorithm provides a coverage control which not only considers the mobility characteristic of each mobile robot for task allocation but generates robot velocity profile for synchronized coverage completion within the constrained time. Since the environment for robot coverage work...
Renewable energy sources which are gaining popularity over conventional resources mostly produce intermittent power as they fall under the influence of natural phenomena as daily cycle or weather conditions. However, worldwide remarkable growth of electricity generation from renewable resources in the recent years has resulted in the decentralized production posing network load stability problems,...
As a study seeking for technical improvement measures by analyzing problems in the aspect of human security among physical security area, it focused on the problems of the existing human security, vitalization of electronic security and improvement measures applying IT. In order to research the efficient human management measures and satisfaction with consumers' demands by combining IT with work performance...
Although multi-core processors have emerged as a dominant low-power architectural solution in high performance processor design, it is still challenging to take a full advantage of the high power efficiency of multi-core processors. One such challenge occurs when an operating system tries to assign a multi-threaded application to a target multi-core processor in an energy efficient fashion. With an...
Cardiovascular disease is a condition of interest to clinicians around the world and is one of the chief causes of death. In Korea, cardiovascular disease is the second largest cause of death following cancer, and is classified as one of the four major diseases, making an early diagnosis of cardiovascular disease essential for proper and timely treatment. Although the risk of cardiovascular disease...
The mobility enhanced pMOS transistors have been successfully implemented into sub-50nm DRAM for the first time. The uni-axial strained channels were embodied by filling the recessed source / drain with epitaxial SiGe film. Mobility boosting and reduced external resistance enabled pMOS transistors to increase saturation current by 20%, and retarded boron diffusion reduced DIBL by 17mV/V compared to...
This paper presents a new work space modeling and search algorithm for complete coverage of robotic environment. The proposed algorithm named spatial cell diffusion (SCD) encodes the target area as groups of Gray codes for grid cells with size of instantaneous robot coverage and extends its sweep area by diffusing occupied cells outwards through continuous spiral movement. Based on the direct and...
This paper presents a distributed robust adaptive controller for multiple mobile robots engaged in cooperative tracking and capturing of moving target object. The proposed controller guarantees asymptotic convergence of distributed multi-robot locations to the desired distance enclosing the moving target object. In the distributed controller, linear and angular velocity inputs are generated by using...
We propose an alternative approach for time interpolation of (Time to Digital Convertor)TDC in which a saw-tooth wave is generated instead of using sinusoidal wave in [10]. The proposed method avoids floating number operation for runtime as well as lowers the temperature variation caused by analog passive components. Since the differential portion of two projected signals is amplified, the wider range...
This paper introduces a new technique for image intensity bit-depth scaling for display devices. Conventional bit-depth scaling methods such as spatial 2D filtering and dithering algorithms suffer from false contours or dithered pattern artifacts, which significantly deteriorate image quality in display devices. In this paper, we propose spatio-temporal 3D adaptive noise shaping filter that does not...
In the recent aging society, studies on health care services have been actively conducted to provide quality services to medical consumers in wire and wireless environments. However, there are some problems in these health care services due to the lack of personalized service and the uniformed way in services. For solving these issues, studies on customized services in medical markets have been processed...
The characteristics of a power quality disturbance generator for microgrid is described. The generator is used to test the performance of a microgrid including STS. The proposed generator has good features of high reliability, low cost, simple structure, high efficiency, and reduced voltage drop. The main switching device is SCR thyristor, and all the thyristors have natural commutation characteristic,...
Due to its restricted usage and accuracy in measuring extremely short interval of time, TDC (time to digital converter) embedded measurement devices are relatively expansive. Even if new applications are being developed in daily life as well as in industry, the cost condition of TDC based measurement systems needs to be improved. To reduce the deployment cost on a commercial scale, analogue interpolation...
A 3-phase voltage disturbance generator applicable for the operation of nonlinear load is proposed. To test the performance of the custom power devices such as DVR, SSTS, dynamic UPS, etc., a voltage disturbance generator is necessary. The proposed generator has good features of high reliability, low cost, simple structure, high efficiency, and reduced voltage drop in normal operation. The main switching...
This paper presents a robust distributed architecture for adaptive and intelligent systems, called EAS (environment adaptive learning scheme), with self-learning capability to use under dynamic and uneven environments. Our proposed system adopts the concepts of situation-awareness with the evolutionary computations where the working environments are modeled and identified as environmental situations...
This paper suggests the control technique that end-effector of manipulator can chase an object using an image gained from a stereo camera installed in a mobile robot platform and the camera positioned at the end of redundant manipulator in a wide working space. By using the stereo camera for searching the object in the wide working space, it is controlled to enable the end-effector of manipulator...
In this paper, an InGaP/GaAs HBT Broadband MMIC Mixer with high output power is designed within a total chip area of 1.3 x 1.0 mm2. The down-conversion mixer shows return loss of -10 dB and a conversion gain of +2.6 dB in the broadband frequency range of 400 MHz to 8 GHz. It also shows a third-order input intercept point (IIP3) of+ 16.78 dBm, a third- order output intercept point (OIP3) of +19.38...
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