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In this paper a new and accurate performance analysis of the Bartlett method-based spectrum sensor is presented for the application of cognitive radios. To do this, first the attributes of the quadratic form representation of Bartlett power spectrum estimator are studied, and then a closed form for the cumulative distribution function (CDF) is derived and exploited to obtain the probabilities of false...
The paper formulates the problem of sequential Bayesian estimation of a compound state consisting of a multi-object dynamic state and a multi-sensor bias. The compound state is modelled by a doubly stochastic point process, where the multi-object bias is a parent, whereas the multi-object state is the offspring point process. The prediction and the update steps for the first-order moment of the posterior...
Understanding network link loss is particularly important for optimizing delay-sensitive applications. This paper addresses the problem of estimating temporal dependence characteristic of link loss by using network tomography. First, the k-th order Markov Chain (k > 1) is introduced to model the packet loss process. The model considers the dependence of k + 1 consecutive packets, and is capable...
This paper proposes a novel flash code which is based on the index-less indexed flash codes (ILIFC) but uses significantly small slices of flash cells. ILIFC has good write deficiency in the worst-case scenario, though, the code-rate and the average write deficiency are severely restricted because the size of an internal data block, which is called a slice, is rather large and not adjustable. In this...
This paper discusses multi-criteria optimization of the 4 links of an 8 DOF haptic master device for a minimally invasive surgery. In minimally invasive surgery, because of limited information from surgical scene, sensation of feedback force and manipulability of device are important factors during surgery. Therefore, optimization of the device is required for efficiency of surgical procedures. To...
Joint motion profiles from nine human test subjects were recorded while catching and lifting a sphere. Significant differences between the two tasks presented themselves consistently across all test subjects. In general, larger abductions and hyperextensions of the metacarpophalangeal joints were observed. The joint motions of the test subjects were simulated in Simulink with a skeletal structure...
In this paper we study three opportunistic schedulers for the problem of optimal multi-class flow-level scheduling in wireless downlink and uplink systems. For user channels we employ the Gilbert-Elliot model of good and bad channel condition with flow-level interpretation, and assume an automatic repeat query (ARQ) feedback, so that channel state information is available at the end of the slot only...
The joint motion profiles of 10 human test subjects were recorded as they ran their hands over a flat surface and a convex surface. From this data, three controllers for a dexterous robotic hand were developed to mimic this behavior. Specifically, this work examines the role of finger abduction force and position feedback to motors that control finger extension. Experimental results show the biomimetic...
Joint motion profiles from nine human test subjects were recorded while catching and lifting a cylinder. Significant differences between the two tasks presented themselves consistently across all test subjects. In general, initial rapid hyperextensions were observed while catching the cylinder versus simply picking it up. Slightly larger ranges of abduction were also seen for the catch, but, as expected...
A robustly stable index finger control algorithm is presented which allows a robotic hand to learn from experience. The proposed algorithm considers a specific case of environment interaction that requires simultaneous motion and posture control of the manipulator. In preliminary experiments, hand motion profiles of ten human test subjects were recorded while running their hands over a contoured surface...
In this paper, a new method for solving the inverse kinematics of the fingers of an anthropomorphic hand is proposed. Our approach combines a Modified Selectively Damped Least Squares (MSDLS) and Jacobian Transpose (JT) methods. The main advantages of this method with respect to the ordinary SDLS are: optimal Cartesian increment, shorter computation time and better response near singularity configurations...
In general, optimal design for the mechanism such as Gough-Stewart Platform (GSP) does not take into account practical factors of the mechanism such as its component weight and size, and mechanical interferences among them, etc. Particularly, in designing a robot module for micro-surgical operations which would be mounted at the end of a macro manipulator, its light weight, compactness, as well as...
This paper studies secure transmission with parallel relays. We use relays to help users for transmission, but we also wish to keep the information secret against the relays. We first study the secrecy rate region for a simple parallel relay channel, and then extend the results to the parallel relay broadcast channel, in which the users receive different messages from the source.
This paper deals with a switching control method for underactuated manipulators. This method selects a partially-stable controller from a number of partially-stable controllers which are designed fuzzy reasoning. We design switching rules on an error energy plane, in which boundary curves to split an energy plane into utilized partially-stable controllers describe fuzzy rules. In this study, we consider...
In this paper, we study the joint resource allocation for the multi-destination amplify-and-forward relay network with direct source-to-destination links based on orthogonal frequency division multiplexing (OFDM) transmission. We aim to maximize the sum rate by jointly optimizing power allocation, subcarrier pairing, user assignment and transmission mode classification subject to the individual power...
The purpose of this research is to analyze the innovation efficiency of Chinese domestic-funded enterprises. Data envelopment analysis (DEA) and Malmquist index are used to evaluate innovation efficiency changes. CCR model is applied to measure technical innovation efficiency scores, radial movements, and slack movements. BCC model is extended to analyze the factors that contribute to technical innovation...
Text emotion analysis suffers from the lack of faithful emotion features, and the difficulty of mining multiple emotions that are mixed together. In this paper, we provide a Gibbs sampling method to solve these two problems. We explicitly characterize the emotion combination phenomenons, and predict the complex emotions of words together with the emotion intensities for each singular emotion through...
This work addresses joint transceiver optimization for multiple-input, multiple-output (MIMO) systems. In practical systems the complete knowledge of channel state information (CSI) is hardly available at transmitter. To tackle this problem, we resort to the codebook approach to precoding design, where the receiver selects a precoding matrix from a finite set of predefined precoding matrices based...
In this paper we propose a novel algorithm for Distributed Compressed Sensing (DCS) problem, referred as Regularized Sparsity Adaptive Matching Pursuit (RSAMP), which is a modified version of Regularized Orthogonal Matching Pursuit (ROMP) method. It can provide a fast runtime and reconstruct several input signals simultaneously without prior information of their sparseness. This makes it as a promising...
This paper puts the emphasis on symbol timing issues in DC-OFDM based UWB systems. We divide the synchronization process into four modules by functionality: packet detection, coarse timing, TFC detection and fine timing. In the aspect of algorithm development, we adopt the joint auto-correlation and cross-correlation method to meet the requirements of UWB system in different indoor multi-path environments,...
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