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The following topics are dealt with: artificial intelligence; automatic control; biomedical engineering; communication systems; communication theory; computer aided design; computer engineering; computer networks; computer science; education; electromagnetics; electron devices; electronics; image processing; information and communication technologies; knowledge-based systems; multimedia systems; optical...
Summary form only given. The field of digital signal processing (DSP) has been a very active area of research and application for more than 3 decades. This broad development has paralleled in time the rapid development of high speed electronic digital computers, microelectronics, and integrated circuit fabrication technologies. An ever-increasing assortment of integrated circuits specifically tailored...
Summary form only given. Digital images are formed by the pixel values on the selected rectangular grids. Many image processing applications, such as zooming (up and down-scaling), affine transforms (translation, rotation, rescaling), and image warping, require generating pixel values at the desired new positions based on the existing values at the original positions. Pixel values at these new coordinates...
Summary form only given. Since the early days of microminiaturization in the 1970's and 70's, the design and implementation of filters has presented a special problem. The reason for this is mainly that conventional LCR filters, and in particular, inductors, cannot be miniaturized, let alone integrated, on a chip. Thus, for the last forty years or so, inductorless alternatives to LCR filters that...
The paper presents results on the study of HIV-1, Clade F, variability using IT techniques for the quantitative analysis of nucleotide sequences. Specifically, phase analysis and RNA secondary structure for the protease and reverse transcriptase genomic signals have been used to characterize the variability of HIV strains isolated in Romania. Variability signals with respect to average, median and...
We propose a new strategy for cooperative transmit diversity based on superposition modulation and multiuser detection. The new scheme can outperform "classical" cooperative diversity based on decode-and-forward by about 1.5-2 dB in the SNR range of interest, and at the same computational complexity
This paper presents a general approach to distributed detection in sensor networks with noisy communication links. The sensors are independent and observe a common phenomenon. Communication links are noisy and we model them as binary symmetric channels (BSCs). We first consider a scenario with a single access point (AP), and we follow a Bayesian approach for the evaluation of the probability of decision...
This paper attempts to define future 4G wireless networks starting from the convergence idea and adopting cooperative techniques and principles. The later will allow novel services at low power consumptions avoiding the problems associated with the linear extension of existing wireless networks. An architecture for mobile terminals supporting cooperation is presented. Furthermore, a set of cooperative...
In this paper, we approach the partner choice problem in coded cooperative OFDM systems. We first define the user cooperation gain, G f, along with the related cooperation decision parameter, Thetaf, and demonstrate that cooperation is beneficial to the user with Gf > 1, or equivalently Thetaf < 1. The cooperation decision parameter is estimated via the Chernoff upper bound on the pairwise error...
In this paper, we propose a novel distributed turbo coding (DTC) scheme for wireless sensor networks. In the proposed scheme, rather than making a decision on the transmitted information symbols at the relay as in the conventional DTC, the relay calculates and forwards the corresponding soft information. The proposed scheme can effectively overcome error propagation due to erroneous decoding at the...
This paper gives a short overview about new human-centered robotic approaches applied to the rehabilitation of gait and upper-extremity functions in patients with movement disorders. So-called "patient-cooperative" strategies can take into account the patient's intention and efforts rather than imposing any predefined movement. It is hypothesized that such human-centered robotic approaches...
Using a simplified model of quiet standing, we demonstrated analytically that a proportional-derivative (PD) controller can mimic the physiologic control strategy applied by healthy individuals during quiet standing. In a second step, utilizing transcutaneous functional electrical stimulation (FES) of the ankle extensors in experiments with a spinal cord injured subject, it was verified that the PD...
Rehabilitation system for re-education of walking is aimed for gait training in incomplete spinal cord injured patients soon after the accident. It consists of three systems: actuation, sensory, and cognitive. Actuation system is represented by electrical stimulation. Sensory system makes use of goniometers, gyroscopes, accelerometers, hand pushbuttons, and foot-switches. Cognitive information is...
The present work is given in the context of motor function rehabilitation via implanted functional electro-stimulation (FES). Our ultimate objective is to use natural muscle sensitive fiber information as feedback for the FES artificial controller. This implies online extraction of information from neural activity in a form usable by a closed-loop controller. In this study, the in-vivo viscoelastic...
We present the improved control for a neural prosthesis (NP) for functional electrical therapy of standing and walking of hemiplegic individuals. The rule-based control is based on a finite state model that uses kinematics of the legs as input and stimulation of muscles as the output. The rules were determined by an artificial neural network (ANN) through the off-line training that used kinematic...
Mobile agent provides a way to think about solving software problems in a networked environment that fits more naturally with the real world. Mobile agent technology can make distributed systems more adaptable to application needs especially in mobile environment. The use of mobile code makes distributed supervisor systems and the abstractions they provide more flexible to build and use. This paper...
This paper describes an authenticated key agreement procedure for establishing conference sessions between multiple users in IP multimedia subsystem (IMS) of 3G mobile network. The main presumption is a tightly coupled conference model with a central conference server (focus/mixer). The server has only basic functionalities of message distribution, whereby SIP messages are used as carriers for agreement...
There are many problems facing the successful creation of a wireless ubiquitous computing platform. In this paper we outline two pivotal components we have developed, that are needed to build dynamic mobile applications. Firstly we present a peer-to-peer algorithm to resolve location ambiguity in heterogeneous ad-hoc wireless networks, interconnected via public radio networks. Secondly we show how...
The Mobile Electronic Medical Station (meMS) is a combination of a mobile and a measurement device for medical purposes. A tool obtained by such a combination is an extremely useful mobile gadget. Benefits of using Internet should be distributed between all those who participate in this new dimension of life. Diseases that ravage the planet and because of which people die every day present a challenge...
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