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Search Results: 1 - 10 of 471 matches for " Ili? Vojin "
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An improved AC-amplifier for electrophysiology
Jorgovanovi? Nikola,Bojani? Dubravka,IliVojin,Stani?i? Darko
Journal of Automatic Control , 2009, DOI: 10.2298/jac0901007j
Abstract: We present the design, simulation and test results of a new AC amplifier for electrophysiological measurements based on a three op-amp instrumentation amplifier (IA). The design target was to increase the common mode rejection ratio (CMRR), thereby improving the quality of the recorded physiological signals in a noisy environment. The new amplifier actively suppresses the DC component of the differential signal and actively reduces the common mode signal in the first stage of the IA. These functions increase the dynamic range of the amplifier's first stage of the differential signal. The next step was the realization of the amplifier in a single chip technology. The design and tests of the new AC amplifier with a differential gain of 79.2 dB, a CMRR of 130 dB at 50 Hz, a high-pass cutoff frequency at 0.01 Hz and common mode reduction in the first stage of the 49.8 dB are presented in this paper.
A multi-pad electrode based functional electrical stimulation system for restoration of grasp
Male?evi? Neboj?a M,Maneski Lana Z,IliVojin,Jorgovanovi? Nikola
Journal of NeuroEngineering and Rehabilitation , 2012, DOI: 10.1186/1743-0003-9-66
Abstract: Background Functional electrical stimulation (FES) applied via transcutaneous electrodes is a common rehabilitation technique for assisting grasp in patients with central nervous system lesions. To improve the stimulation effectiveness of conventional FES, we introduce multi-pad electrodes and a new stimulation paradigm. Methods The new FES system comprises an electrode composed of small pads that can be activated individually. This electrode allows the targeting of motoneurons that activate synergistic muscles and produce a functional movement. The new stimulation paradigm allows asynchronous activation of motoneurons and provides controlled spatial distribution of the electrical charge that is delivered to the motoneurons. We developed an automated technique for the determination of the preferred electrode based on a cost function that considers the required movement of the fingers and the stabilization of the wrist joint. The data used within the cost function come from a sensorized garment that is easy to implement and does not require calibration. The design of the system also includes the possibility for fine-tuning and adaptation with a manually controllable interface. Results The device was tested on three stroke patients. The results show that the multi-pad electrodes provide the desired level of selectivity and can be used for generating a functional grasp. The results also show that the procedure, when performed on a specific user, results in the preferred electrode configuration characteristics for that patient. The findings from this study are of importance for the application of transcutaneous stimulation in the clinical and home environments.
From biology to ethics: The future of evolution as humanity's path to justice
Raki? Vojin
Theoria, Beograd , 2009, DOI: 10.2298/theo0903037r
Abstract: The future evolution of the human might not be marked so much by his physical change, as by his moral development. I will offer three arguments in favor of the thesis that humanity is gradually moving in the direction of superior moral relations, i.e. the configuration of individuals and societies with an expanded inclination toward justice. The first argument is Kant's, the second Doyle's (which is in fact an indirect argument), while the third one is my own contribution to the discussion. All three arguments I will not only present, but also explain how they relate to each other. I will conclude that the thesis about the gradual development of humanity in the direction of social relations with a stronger foundation in justice can be cogently substantiated.
Is armageddon the alternative to moral enhancement?
Raki? Vojin
Theoria, Beograd , 2012, DOI: 10.2298/theo1203073r
Abstract: Eudaimonic agents have to become dominant in humanity if it is to seriously diminish the probability of its self-annihilation. In order for this to happen, humanity ought to be morally enhanced. It will be argued that moral and cognitive enhancement have to be combined in such a way that all cognitive bio-enhancement leads to moral enhancement.
Religion within the boundaries of mere reason as the key for a comprehension of Kant's cosmopolitanism
Raki? Vojin
Theoria, Beograd , 2010, DOI: 10.2298/theo1001005r
Abstract: This article advances the thesis that Kant's cosmopolitanism is to be interpreted as a view that contains at its core the idea of a world state as the final destination of humanity's historical progress. Evidence for this is to be found in Kant's Religion Within the Boundaries of Mere Reason, in particular on the basis of an interpretation of the notion of the 'ethical commonwealth'. A phase in this progress of humanity toward a world state is a federation of states that Kant advances in Toward Perpetual Peace. Before elucidating this core idea of my article, a review of contemporary interpretations of Kant's cosmopolitanism will be offered. The primary division of these interpretations will be based on the distinction between the 'democratic peace paradigm' and the 'cosmopolitan democracy paradigm'. It will be asserted that the proponents of both paradigms generally claim to have Kantian underpinnings, but by and large suffer from a failure to devote the necessary attention to Religion Within the Boundaries of Mere Reason. This failure is above all detrimental to the argumentation of the proponents of the cosmopolitan democracy paradigm.
The current debate: (C+M) E and ultimate harm
Raki? Vojin
Filozofija i Dru?tvo , 2012, DOI: 10.2298/fid1204087r
Abstract: Persson and Savulescu (2011b) is a largely successful defense of the position promoted in Persson and Savulescu (2008) against Fenton’s critique of this position in Fenton (2009). However, one of Fenton’s essential censures has remained without response: if moral enhancement (ME) is to occur at the genetic or biological level, as Persson and Savulescu suppose it can and ought to, it will not be possible without significant scientific progress, including cognitive enhancement (CE) by bio-medical means. I will offer a response here to this critique Fenton raised-a response Persson and Savulecu did not give. It will be based on the concept of “integrated neuroenhancement”, abbreviated (C+M) E. [Projekat Ministarstva nauke Republike Srbije, br. 41004: Rare Diseases: Molecular Pathophysiology, Diagnostic and Therapeutic Modalities, and Social, Ethical, and Legal Aspects, and br. 43007: Studying Climate Change and its Influence on the Environment: Impacts, Adaptation and Mitigation]
Integration of cognitive and moral enhancement
Raki? Vojin
Filozofija i Dru?tvo , 2012, DOI: 10.2298/fid1202091r
Abstract: I will discuss four major perspectives on cognitive enhancement and morality: 1) cognitive enhancement is morally impermissible because humans are not supposed to alter what God has ordained or nature has shaped; 2) cognitive enhancement is our moral duty, because a cognitively upgraded human is a better human; 3) cognitive enhancement is morally permissible only if it is preceded by moral enhancement; 4) cognitive enhancement is morally permissible only if it is a means to moral enhancement. I shall argue that the first three perspectives are less cogent than the fourth. The fourth perspective integrates cognitive and moral enhancement into one whole. I will denote it by (C+M) E. [Projekat Ministarstva nauke Republike Srbije, br. 41004 i 43007]
The future of morality and international justice
Raki? Vojin
Filozofija i Dru?tvo , 2010, DOI: 10.2298/fid1001019r
Abstract: The focus of this paper will be on the issue of justice, specifically in international relations. In that context, a number of existing theories of international justice will be briefly reviewed. Afterwards, I will turn to the question of what justice actually is. The assertion that justice is based on the idea of freedom will be substantiated. I will attempt to support my position with Doyle's and Kant's argumentation. It will be concluded that there are robust arguments in favor of the thesis that our historical development is marked by a gradual expansion of freedom and justice. Furthermore, we have strong reasons to aspire liberal internationalism based on the idea of humanity's gradual approximation of some form of global state because such a conception might be the best warrant of justice in international relations.
A Fourier series solution for the longitudinal vibrations of a bar with viscous boundary conditions at each end
Vojin Jovanovic
Mathematics , 2011,
Abstract: This paper presents the generalized Fourier series solution for the longitudinal vibrations of a bar subjected to viscous boundary conditions at each end. The model of the system produces a non-selfadjoint eigenvalue problem which does not yield a self-orthogonal set of eigenfunctions with respect to the usual inner product. Therefore, these functions cannot be used to calculate the coefficients of expansion in the Fourier series. Furthermore, the eigenfunctions and eigenvalues are complex-valued. The eigenfunctions can be utilized if the space of the wave operator is extended and a suitable inner product is defined. It is further demonstrated that the series solution contains the solutions for free-free, fixed-damper, fixed-fixed and fixed-free bar cases. The presented procedure is applicable in general to other problems of this type. As an illustration of the theoretical discussion, the results from numerical simulations are presented.
Medical and social factors influencing reproduction in Serbia
?ulovi? Vojin,Ljubi? Aleksandar
Srpski Arhiv za Celokupno Lekarstvo , 2002, DOI: 10.2298/sarh0208247s
Abstract: The authors present results of researches whose aim was to determine the factors that may substantially influence population reproduction in the Republic of Serbia, taking into consideration all specific factors, like cultural background, economic situation, health education, health service organization, religious and historical factors, etc. The research was based on the population census from 1981. Seventeen regions of the inner part of the Republic of Serbia, Vojvodina and Kosovo were included in this research. Stratification was made according to the place of living (village, town) age, occupation (farmer, housewife, non and half-qualified, qualified and highly qualified workers) and education (without education, with unfinished or finished primary school, with secondary school, with college or university degree). In this way 2,141 women were questioned with 101 questions by the method of interview. Interviews were conducted exclusively by doctors - gynaecologists. We determined the frequency of the use of contraceptives, intentional abortions, spontaneous abortions, pre-term deliveries, marriage infertility and term deliveries. Thus, 57.4% of women had basic knowledge of contraception, but only 15.9% of them used it; 58.9% of women had intentional abortions; 16.2% of women had spontaneous abortions, 5.1% of them had pre-term deliveries, and 67% of women had term deliveries. Marriage infertility was found in 8.6% of women. When evaluating population health and behavior, we obtained some information and data concerning addicted diseases (alcohol, smoking, drugs, tranquilizers) homosexuality and ways of sexual intercourse. It was concluded that enormous differences existed among certain regions in the Republic of Serbia, which were conditioned by the diversity of the above mentioned influences. Proposals for the measures to be undertaken in the Republic of Serbia in order to regulate population policy, are given.
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