281 resources related to Circadian rhythm
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The conference program will consist of plenary lectures, symposia, workshops andinvitedsessions of the latest significant findings and developments in all the major fields ofbiomedical engineering.Submitted papers will be peer reviewed. Accepted high quality paperswill be presented in oral and postersessions, will appear in the Conference Proceedings and willbe indexed in PubMed/MEDLINE & IEEE Xplore
2019 IEEE 58th Conference on Decision and Control (CDC)
The CDC is recognized as the premier scientific and engineering conference dedicated to the advancement of the theory and practice of systems and control. The CDC annually brings together an international community of researchers and practitioners in the field of automatic control to discuss new research results, perspectives on future developments, and innovative applications relevant to decision making, systems and control, and related areas.The 58th CDC will feature contributed and invited papers, as well as workshops and may include tutorial sessions.The IEEE CDC is hosted by the IEEE Control Systems Society (CSS) in cooperation with the Society for Industrial and Applied Mathematics (SIAM), the Institute for Operations Research and the Management Sciences (INFORMS), the Japanese Society for Instrument and Control Engineers (SICE), and the European Union Control Association (EUCA).
2019 IEEE International Conference on Systems, Man, and Cybernetics (SMC2019) will be held in the south of Europe in Bari, one of the most beautiful and historical cities in Italy. The Bari region’s nickname is “Little California” for its nice weather and Bari's cuisine is one of Italian most traditional , based of local seafood and olive oil. SMC2019 is the flagship conference of the IEEE Systems, Man, and Cybernetics Society. It provides an international forum for researchers and practitioners to report up-to-the-minute innovations and developments, summarize stateof-the-art, and exchange ideas and advances in all aspects of systems science and engineering, human machine systems and cybernetics. Advances have importance in the creation of intelligent environments involving technologies interacting with humans to provide an enriching experience, and thereby improve quality of life.
ISSCC is the foremost global forum for solid-state circuits and systems-on-a-chip. The Conference offers 5 days of technical papers and educational events related to integrated circuits, including analog, digital, data converters, memory, RF, communications, imagers, medical and MEMS ICs.
IEEE/SICE SII is the premier symposium series presenting the state of the art and future perspectives of System integration, where industry experts, researchers, and academics share ideas and experiences surrounding frontier technologies, breakthrough and innovative solutions and applications.
The theory, design and application of Control Systems. It shall encompass components, and the integration of these components, as are necessary for the construction of such systems. The word `systems' as used herein shall be interpreted to include physical, biological, organizational and other entities and combinations thereof, which can be represented through a mathematical symbolism. The Field of Interest: shall ...
Broad coverage of concepts and methods of the physical and engineering sciences applied in biology and medicine, ranging from formalized mathematical theory through experimental science and technological development to practical clinical applications.
Part I will now contain regular papers focusing on all matters related to fundamental theory, applications, analog and digital signal processing. Part II will report on the latest significant results across all of these topic areas.
Specific topics of interest include, but are not limited to, sequence analysis, comparison and alignment methods; motif, gene and signal recognition; molecular evolution; phylogenetics and phylogenomics; determination or prediction of the structure of RNA and Protein in two and three dimensions; DNA twisting and folding; gene expression and gene regulatory networks; deduction of metabolic pathways; micro-array design and analysis; proteomics; ...
Methods, algorithms, and human-machine interfaces for physical and logical design, including: planning, synthesis, partitioning, modeling, simulation, layout, verification, testing, and documentation of integrated-circuit and systems designs of all complexities. Practical applications of aids resulting in producible analog, digital, optical, or microwave integrated circuits are emphasized.
Computers in Cardiology 1995, 1995
The aim of this study was to examine how sampling rates below 1000 Hz influence the precision of heart rate variability analysis. Simulated tachograms as well as tachograms from healthy persons were investigated. With parameters from time, frequency domain and non-linear dynamics these tachograms were classified. The results were compared with theoretical assumptions and special error measures were derived. New ...
IEEE Spectrum, 1990
Concerns that electromagnetic (EM) fields may cause cancer and endocrine and nervous system disorders are discussed. The focus is on 60 Hz fields, where the mechanism of interaction probably involves the cell membrane, is nonlinear, and may act by causing some cooperative phenomena among the components of the cell membrane. Two basic epidemiological study designs have been used in work ...
2006 IEEE/NLM Life Science Systems and Applications Workshop, 2006
For studying autonomous circadian rhythms of proteins in organisms, various mathematical models have been proposed. In this study, we have investigated bifurcations of periodic oscillations observed in circadian models incorporating the effect on a light-dark cycle and show that the waveform of the periodic variation in the light-induced parameter has a marked influence on the global bifurcation structure or the ...
Proceedings of the 40th IEEE Conference on Decision and Control (Cat. No.01CH37228), 2001
Concerns the modelling of biological control with rhythm, especially the mammalian circadian rhythm. Van der Pol oscillator networks have been proposed as a template to produce abstract circuit models that are capable of producing complex oscillatory and spiking patterns of behavior. Here, a particular case of a symmetrically coupled network is treated for its global behavior. It is shown that ...
Computers in Cardiology, 2002
To determine whether sleep periods can be identified from Holter-derived data using a combination of hourly average HR patterns and hourly spectral plots, Holier data from N=77 randomly-selected subjects with self-reported bed:wake (B:W) times were examined. N=50 were patients with a recent MI (C), 12 were younger subjects from a Holler quality validation study (Y), and 15 were subjects>65 years ...
The aim of this study was to examine how sampling rates below 1000 Hz influence the precision of heart rate variability analysis. Simulated tachograms as well as tachograms from healthy persons were investigated. With parameters from time, frequency domain and non-linear dynamics these tachograms were classified. The results were compared with theoretical assumptions and special error measures were derived. New developed measures from non-linear dynamics showed an insensitive behavior to a reduced sampling frequency down to 128 Hz. The major results of this study lead to the conclusion to use sampling rates only above 120 Hz which implies a total error in the range of approximately 1.8/spl plusmn/1.5%. However only the use of sampling rates above 200 Hz provides nearly error free results.
Concerns that electromagnetic (EM) fields may cause cancer and endocrine and nervous system disorders are discussed. The focus is on 60 Hz fields, where the mechanism of interaction probably involves the cell membrane, is nonlinear, and may act by causing some cooperative phenomena among the components of the cell membrane. Two basic epidemiological study designs have been used in work on cancer caused by EM fields. The first, retrospective case-control studies, compare an existing population of cases with a control group without the disease that is selected to be similar in all other characteristics. The second type computes the proportional mortality (or incidence) ratio, which compares the mortality from (or incidence of) disease in the sample population to that in general public. Selected studies that have looked for a link between exposure to power-frequency fields and cancer are summarized. Results have been mixed, but many studies do suggest a connection. One possibility is that EM fields act as a promoter of cancer. Also discussed are studies on birth defects and circadian rhythm, and cell and organ studies. Some experiments suggest that mediation by the cell membrane and/or large proteins that float in it is the mechanism by which fields couple to the cell.<<ETX>>
For studying autonomous circadian rhythms of proteins in organisms, various mathematical models have been proposed. In this study, we have investigated bifurcations of periodic oscillations observed in circadian models incorporating the effect on a light-dark cycle and show that the waveform of the periodic variation in the light-induced parameter has a marked influence on the global bifurcation structure or the type of dynamic behavior resulting from the forcing term of the circadian oscillator by the LD cycles
Concerns the modelling of biological control with rhythm, especially the mammalian circadian rhythm. Van der Pol oscillator networks have been proposed as a template to produce abstract circuit models that are capable of producing complex oscillatory and spiking patterns of behavior. Here, a particular case of a symmetrically coupled network is treated for its global behavior. It is shown that for a certain connection pattern the circuit is capable of producing globally asymptotically stable oscillations.
To determine whether sleep periods can be identified from Holter-derived data using a combination of hourly average HR patterns and hourly spectral plots, Holier data from N=77 randomly-selected subjects with self-reported bed:wake (B:W) times were examined. N=50 were patients with a recent MI (C), 12 were younger subjects from a Holler quality validation study (Y), and 15 were subjects>65 years old from the Cardiovascular Health Study (O). N=18 (C) were excluded for a combination of abnormal circadian rhythm and abnormal HRV plots. The accuracy of hourly HR+HRV patterns to identify bedtime /spl plusmn/1 hr was: 100% (O), 84% (C), and 100% (Y). Hourly HR+HRV patterns identified wake-times /spl plusmn/1 hr 100% of the time for (O), 91% for (C) and 100% (Y). Identification of sleep periods from Holter data appears feasible in different groups using a simple algorithm. This method could permit detailed study of sleep periods in Holter cohorts where diaries are unavailable.
A wrist movement and arterial pulse recording system has been developed for continuous data acquisition in studies of activity/rest time periods, sleep quantity and quality, general activity level, resting heart rate and circadian rhythms. The system employs a wrist-mounted optical sensor, low-power 8-bit single chip microcomputer and a compact flash memory. The microcomputer detects whether the wrist is moving or inactive; if it is moving, activity signals are recorded by the compact flash memory. If the wrist is at rest, the arterial pulse waveform is continuously recorded.
Rhythmic levels of activity with nearly twenty-four hour periods in the absence of environmental cues have been observed in species across four kingdoms. For the fly and the mouse it is established that these circadian rhythms arise from cellular genetic networks containing delayed transcriptional feedback mechanisms. This origination of physiologically relevant rhythms from dynamic feedback has inspired many mathematical models of this process. In the present work, the ability of four models from the literature to produce reliable oscillations in the face of stochastic disturbances is explored. The results show that there is a trade off of resistance to some disturbances for increased sensitivity to others, which allows an analogy to the Bode sensitivity integral to be made.
After an introduction on the effects of light on human wellness, circadian rhythm and perception of objects with this work we propose an innovative white LED lighting system able to smoothly change CCT (Correlated Color Temperature) while sensibly changing the spectral power density in the blue region (460-480 nm). Designing methodology, photometrical, electrical, optical and thermal results will be discussed. The proposed tunable white LED system is able to achieve high CRI (Color Rendering Index) (above 90) in a large CCT range (2800 - 5500 K), thus allowing a high comfort light in different conditions. Results from thermal design indicate a maximum junction temperature of 85°C at 700 mA, with an equivalent thermal resistance junction to ambient of 1.6 K/W for the series of LEDs used in the light engine. The optical emission has been designed by means of a color mixing chamber and a parabolic reflector thus achieving a good color uniformity at different emission angles and 18° beam divergence. The Light engine is engineered to be efficient (above 85 lm/W) and cost effective while working with a standard commercially available constant current LED driver. The specific control gear can be programmed to control the intensity and CCT of several lamps connected together.
A living body has self-organized information processing systems in their nerve system. They construct various internal models of the environment autonomically. Periodic behaviors, such as circadian rhythm, locomotion of limbs in walking and tapping, come from these internal pattern generators. They obtain the periodic signal by use of external stimuli, that is, brightness of day lights and images from eyes. In this study, the authors represent that a model based on multilayer type neural network with feedback connections. This neural network can construct periodic pattern generators by training using external input signal. Arbitrary periodic signal can be generated if the network trained properly. Both periodic scalar signals and periodic image signals were examined to investigate characteristic of the proposed model. After the neural network training, they generated periodic signals that are identical to training pattern autonomically. In addition, stability of the generation of periodic signals was observed even if noise was mixed in the signal generation process. This characteristic is corresponding to homeostasis of biological system. These results show a pattern generator similar to a biological system was constructed in the proposed model. This neural network model is expected to be convenient as a model to analyze the fundamental mechanism of the brain function.
The multivariate simulation is based on models of physiological and physical activities using Markov chains and Petri networks and is designed to produce the medical and behavioral data normally obtained from a patient living in the HIS/sup 2/. The HIS/sup 2/ is an experimental platform to develop and evaluate technologies that ensure high levels of safety and health care for residential treatment. It records a patient's vital signs, daily activities, and metrological conditions that are then interpreted and manipulated in the data fusion programs. The main goal of the computer simulation is to generate databases that allow us to assess the alarm triggering procedures and tools used in the data fusion analysis programs developed for the HIS/sup 2/. An example of data fusion program, the system for the automatic measurements of the circadian rhythms of activity, which uses these databases, is briefly presented.
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