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Abundance of connected devices generate numerous data. Increased computing power of each device would enable themselves to train and generate device knowledge from collected data. In this paper, we propose a novel approach to transfer device knowledge between interoperable devices through structured data. This approach helps devices to use device knowledge from other device as input data. Reusing...
In this paper, we present a new beacon recognition method for wireless sensor devices to access beacon-enabled WSN with low-power consumption. At first, we explain necessity of the low-power beacon recognition in the beacon-enabled wireless sensor networks. By realigning network resources, we catch that beacons are in the same position in each BI (beacon interval). Then, we propose how to switch operation...
In this paper, we studies the asymptotic analysis of space-time block codes (STBC) over spatially correlated Nakagami fading channels for the multiple-input multiple-output (MIMO) systems. Using asymptotic analysis, this paper quantifies the diversity order and signal to noise ratio (SNR) gain of the outage probability and symbol error rate (SER) with the M-ary quadrature amplitude modulation (QAM)...
We present some preliminary results on state estimation of SmQT system, which consists of multiple UAVs. By using multiple set of IMU-camera and additional IMU, we estimate whole state of UAVs and tool. The estimator merge vision data and IMU measurements under mechanical constraint of SmQT system to increase tracking accuracy and robustness. Simulation is also performed to illustrate the results.
This paper covers the energy-saving features of a robotics system by redundant actuation. By installing more actuators than the degrees of freedom, the actuating torques can be distributed This distribution can reduce the overall energy loss, which reduces the overall energy consumption. An experiment was conducted with a 2-DOF general manipulator and redundant actuated manipulator; these were made...
In the development of emerging 3D IC packaging using TSV, wafer back side treatment is one of key processes. The TSV back side process called MEOL (Middle End Of Line) is a newly introduced process which is performed after front side treatment/bumping, or before chip stacking assembly. The MEOL process adapts some conventional fab processes such dry etch, PECVD, and CMP but there are some differences...
This paper proposes the hysteretic buck converter with thermister to minimize the output ripple votage. The conventional hysteretic buck converter shows fast response, but it suffers from the large ripple voltage due to the logic switching. The proposed hysteretic buck converter employs the switched-capacitor techniques with comparators to maintain the minimum ripple voltage. The simulation results...
This paper deals with the critical arithmetic analysis of the Attitude Determination System design of Nano-satellites considering the sensor combination model considering finely-selected MEMS based Gyroscopes, Magnetometers and Sun Sensors respectively. Though the competency for achieving higher accuracy for proper positioning of a Nano-satellite is being experimented across the globe effectively,...
We identify a class of stochastic control problems with highly random rewards and high discount factor which induce high levels of statistical error in the estimated action-value function. This produces significant levels of max-operator bias in Q-learning, which can induce the algorithm to diverge for millions of iterations. We present a bias-corrected Q-learning algorithm with asymptotically unbiased...
We have developed the λ/4 phase-shifted 1.3-µm dual mode laser as an optical beat source of continuous-wave (CW) terahertz (THz) generation. The mode beat frequency is continuously tuned from 230 to 1485 GHz via integrated micro-heaters. The CW THz system is also demonstrated with low-temperature-grown InGaAs photomixers.
We demonstrated a fiber-coupled THz time-domain spectroscopy (TDS) system. A THz output power of 132 nW of the THz emitter in the system was measured by a Golay-cell. Water vapor dips in the free space were clearly observed by the THz detector in the system.
The phase shifted dual-mode laser diode (DML) is demonstrated for the optical beat source of continuous wave THz system. Optical beat frequency can be continuously tuned from 0.22 THz to 1.15 THz. High side mode suppression ratio of 40 dB is obtained through whole tuning range.
Using OPNET simulation we evaluate performance of 802.22 system operating over TV white space when 802.11af system coexist with 802.22 system at a given geo-location considering co-channel interference. To do that, we consider coexistence scenario that 802.11af system is located near 802.22 base station (BS) or customer-premises equipment (CPE). We compare upstream and downstream performance of 802...
In this paper, we present a new scheme combining mode switching (SM/STBC), and transmit antenna subset selection (Tx-AnSS), i.e.,joint selection for a multiuser-MIMO (MU-MIMO) system with block diagonalization (BD) for error probability enhancement. Further, the proposed scheme also adaptively selects the number of streams by a simple selection criterion which is a square minimum Euclidean distance...
Nowadays, Earth observation satellites are widely used to acquire high quality, and the satellites should have more observation missions at the same time. In this case, it is useful to develop a systematic command generation method for satellite pointing to acquire wide area image efficiently. In this paper, three efficient methods are proposed to operate Earth observation satellite attitude pointing...
In this paper, we present a new MIMO-OFDM system model with a zero forcing (ZF) receiver for obtaining higher diversity order than a conventional scheme by selecting the transmit antennas. The difference of the proposed scheme compared to the conventional scheme is that the number of selected transmit antennas may change (i.e., multimode antenna selection scheme) for each subcarrier. When we apply...
In this paper, we propose a novel joint diversity with multi-stream selection for error-rate minimization in multi-user spatial multiplexing systems with BD-precoding. The proposed scheme adaptively selects the user set, the transmit antenna subset and the number of multi-streams maximizing selection criterion. For complexity reduction, we employ the SNR-based selection criterion. The joint diversity...
This paper presents performance analysis of STBC scheme with multi-user diversity (MUD) and transmit (TX) antenna subset selection (AnSS) where the user and the antenna subset are adaptively selected in MIMO systems. We derive an analytical expression for the average effective SNR and outage probability, showing that STBC scheme with MUD and Tx-AnSS provides full diversity. We also derive analytical...
Welding is very difficult and dangerous for manual welders. The double hull structures found in ships are very hazardous environments, and as such the shipbuilding industry demands a safer, autonomous system to perform the welding rather than deploy manual welders. This paper describes the design of a new mechanism, called the 'Rail Runner', which is able to autonomously travel within the double hull...
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