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Search Results: 1 - 10 of 144483 matches for " F. Peper "
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New noise-based logic representations to avoid some problems with time complexity
H. Wen,L. B. Kish,A. Klappenecker,F. Peper
Physics , 2011,
Abstract: Instantaneous noise-based logic can avoid time-averaging, which implies significant potential for low-power parallel operations in beyond-Moore-law-chips. However, the universe (uniform superposition) will be zero with high probability (non-zero with exponentially low probability) in the random-telegraph-wave representation thus the operations with the universe would require exponential time-complexity. To fix this deficiency, we modify the amplitudes of the signals of the L and H states and achieve an exponential speedup compared to the old situation. Another improvement concerns the identification of a single product (hyperspace) state. We introduce a time shifted noise-based logic, which is constructed by shifting each reference signal with a small time delay. This modification implies an exponential speedup of single hyperspace vector identification compared to the former case and it requires the same, O(N) complexity as in quantum computing.
Potentiometric Response Characteristics of Membrane-Based -Selective Electrodes Containing Ionophore-Functionalized Polymeric Microspheres
Shane Peper,Chad Gonczy
International Journal of Electrochemistry , 2011, DOI: 10.4061/2011/276896
Abstract: Cs
Information theoretic security by the laws of classical physics
R. Mingesz,L. B. Kish,Z. Gingl,C. G. Granqvist,H. Wen,F. Peper,T. Eubank,G. Schmera
Physics , 2012,
Abstract: It has been shown recently that the use of two pairs of resistors with enhanced Johnson-noise and a Kirchhoff-loop-i.e., a Kirchhoff-Law-Johnson-Noise (KLJN) protocol-for secure key distribution leads to information theoretic security levels superior to those of a quantum key distribution, including a natural immunity against a man-in-the-middle attack. This issue is becoming particularly timely because of the recent full cracks of practical quantum communicators, as shown in numerous peer-reviewed publications. This presentation first briefly surveys the KLJN system and then discusses related, essential questions such as: what are perfect and imperfect security characteristics of key distribution, and how can these two types of securities be unconditional (or information theoretical)? Finally the presentation contains a live demonstration.
Working Parents' use of work-life policies
Dulk,Laura den; Peper,Bram;
Sociologia, Problemas e Práticas , 2007,
Abstract: in this paper, we examine working parent?s use of work-life policies in three financial sector organizations in the netherlands. we analyse the barriers and support regarding the actual take up of work-life policies by working parents and to what extent this in turn influence their experienced work-life balance. we collected survey data in three dutch financial sector organizations: one public sector organization and two private firms. all three differ considerably regarding their organizational culture and working practices. two of the organizations are characterised by a contradictory work-life culture, and one by an approving work-life culture. findings point out that household characteristics and the work-life culture in the organization determine the take up of work-life policies. with respect to the work-life balance of working parents, organizational culture is an important determinant, no impact is found of the utilization of policies.
Information Networks Secured by the Laws of Physics
Laszlo B. Kish,Ferdinand Peper
Computer Science , 2011,
Abstract: In this paper, we survey the state of the art of the secure key exchange method that is secured by the laws of classical statistical physics, and involves the Kirchhoff's law and the generalized Johnson noise equation, too. We discuss the major characteristics and advantages of these schemes especially in comparison with quantum encryption, and analyze some of the technical challenges of its implementation, too. Finally, we outline some ideas about how to use already existing and currently used wire lines, such as power lines, phone lines, internet lines to implement unconditionally secure information networks.
Instantaneous, non-squeezed, noise-based logic
Ferdinand Peper,Laszlo B. Kish
Computer Science , 2010, DOI: 10.1142/S0219477511000521
Abstract: Noise-based logic, by utilizing its multidimensional logic hyperspace, has significant potential for low-power parallel operations in beyond-Moore-chips. However universal gates for Boolean logic thus far had to rely on either time averaging to distinguish signals from each other or, alternatively, on squeezed logic signals, where the logic-high was represented by a random process and the logic-low was a zero signal. A major setback is that squeezed logic variables are unable to work in the hyperspace, because the logic-low zero value sets the hyperspace product vector to zero. This paper proposes Boolean universal logic gates that alleviate such shortcomings. They are able to work with non-squeezed logic values where both the high and low values are encoded into nonzero, bipolar, independent random telegraph waves. Non-squeezed universal Boolean logic gates for spike-based brain logic are also shown. The advantages vs. disadvantages of the two logic types are compared.
Neuropsychological effects of chronic low-dose exposure to polychlorinated biphenyls (PCBs): A cross-sectional study
Martin Peper, Martin Klett, Rudolf Morgenstern
Environmental Health , 2005, DOI: 10.1186/1476-069x-4-22
Abstract: Thirty employees exposed to indoor air contaminated with PCBs from elastic sealants in a school building were compared to 30 non-exposed controls matched for education and age, controlling for gender (age range 37–61 years). PCB exposure was verified by external exposure data and biological monitoring (PCB 28, 101, 138, 153, 180). Subjective complaints, learning and memory, executive function, and visual-spatial function was assessed by standardized neuropsychological testing. Since exposure status depended on the use of contaminated rooms, an objectively exposed subgroup (N = 16; PCB 28 = 0.20 μg/l; weighted exposure duration 17.9 ± 7 years) was identified and compared with 16 paired controls.Blood analyses indicated a moderate exposure effect size (d) relative to expected background exposure for total PCB (4.45 ± 2.44 μg/l; d = 0.4). A significant exposure effect was found for the low chlorinated PCBs 28 (0.28 ± 0.25 μg/l; d = 1.5) and 101 (0.07 ± 0.09 μg/l; d = 0.7). Although no neuropsychological effects exceeded the adjusted significance level, estimation statistics showed elevated effect sizes for several variables. The objectively exposed subgroup showed a trend towards increased subjective attentional and emotional complaints (tiredness and slowing of practical activities, emotional state) as well as attenuated attentional performance (response shifting and alertness in a cued reaction task).Chronic inhalation of low chlorinated PCBs that involved elevated blood levels was associated with a subtle attenuation of emotional well-being and attentional function. Extended research is needed to replicate the potential long-term low PCB effects in a larger sample.The neurobehavioral effects of polychlorinated biphenyls (PCBs) have been extensively studied in neonates and children [39,62,77]. However, no conclusive evidence is available on chronic nervous system effects in adult humans. The present neuropsychological group study explored the potential cognitive and
Instantaneous noise-based logic
Laszlo B. Kish,Sunil Khatri,Ferdinand Peper
Physics , 2010, DOI: 10.1142/S0219477510000253
Abstract: We show two universal, Boolean, deterministic logic schemes based on binary noise timefunctions that can be realized without time-averaging units. The first scheme is based on a new bipolar random telegraph wave scheme and the second one makes use of the recent noise-based logic which is conjectured to be the brain's method of logic operations [Physics Letters A 373 (2009) 2338-2342]. Error propagation and error removal issues are also addressed.
Massively parallel computing on an organic molecular layer
Anirban Bandyopadhyay,Ranjit Pati,Satyajit Sahu,Ferdinand Peper,Daisuke Fujita
Physics , 2011, DOI: 10.1038/nphys1636
Abstract: Current computers operate at enormous speeds of ~10^13 bits/s, but their principle of sequential logic operation has remained unchanged since the 1950s. Though our brain is much slower on a per-neuron base (~10^3 firings/s), it is capable of remarkable decision-making based on the collective operations of millions of neurons at a time in ever-evolving neural circuitry. Here we use molecular switches to build an assembly where each molecule communicates-like neurons-with many neighbors simultaneously. The assembly's ability to reconfigure itself spontaneously for a new problem allows us to realize conventional computing constructs like logic gates and Voronoi decompositions, as well as to reproduce two natural phenomena: heat diffusion and the mutation of normal cells to cancer cells. This is a shift from the current static computing paradigm of serial bit-processing to a regime in which a large number of bits are processed in parallel in dynamically changing hardware.
A Systematic Review of Bilateral Upper Limb Training Devices for Poststroke Rehabilitation
A. (Lex) E. Q. van Delden,C. (Lieke) E. Peper,Gert Kwakkel,Peter J. Beek
Stroke Research and Treatment , 2012, DOI: 10.1155/2012/972069
Abstract: Introduction. In stroke rehabilitation, bilateral upper limb training is gaining ground. As a result, a growing number of mechanical and robotic bilateral upper limb training devices have been proposed. Objective. To provide an overview and qualitative evaluation of the clinical applicability of bilateral upper limb training devices. Methods. Potentially relevant literature was searched in the PubMed, Web of Science, and Google Scholar databases from 1990 onwards. Devices were categorized as mechanical or robotic (according to the PubMed MeSH term of robotics). Results. In total, 6 mechanical and 14 robotic bilateral upper limb training devices were evaluated in terms of mechanical and electromechanical characteristics, supported movement patterns, targeted part and active involvement of the upper limb, training protocols, outcomes of clinical trials, and commercial availability. Conclusion. Initial clinical results are not yet of such caliber that the devices in question and the concepts on which they are based are firmly established. However, the clinical outcomes do not rule out the possibility that the concept of bilateral training and the accompanied devices may provide a useful extension of currently available forms of therapy. To actually demonstrate their (surplus) value, more research with adequate experimental, dose-matched designs, and sufficient statistical power are required. 1. Introduction As technology advances, a growing number of mechanical and robotic training devices (i.e., mechanical devices with electronic, computerized control systems) for upper limb training have been proposed for stroke rehabilitation. Compared to conventional therapies, these training devices have the advantage that they allow a self-controlled increase in training intensity and frequency as well as the opportunity to train independently [1–4]. In recent years, a substantial number of these training devices have been designed specifically for bilateral upper limb training, but an integral overview and evaluation have thus far been lacking. The present study seeks to fill this lacuna. Bilateral upper limb training is by no means a new form of stroke rehabilitation. Since days long past, therapists have been creative in using appliances, such as pulleys, to move the most impaired upper limb simultaneously with the less impaired upper limb [5]. Nevertheless, the current upsurge in the interest in bilateral upper limb training has a relatively short history and arose partly serendipitously [6, 7] and partly from insights gleaned from the motor control literature.
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