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Tytuł:
Semivolatile compounds in schools and their influence on cognitive performance of children
Autorzy:
Hutter, Hans-Peter
Haluza, Daniela
Piegler, Kathrin
Hohenblum, Philipp
Fröhlich, Marina
Scharf, Sigrid
Uhl, Maria
Damberger, Bernhard
Tappler, Peter
Kundi, Michael
Wallner, Peter
Moshammer, Hanns
Powiązania:
https://bibliotekanauki.pl/articles/2179136.pdf
Data publikacji:
2013-08-01
Wydawca:
Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
Tematy:
children’s health
cognitive performance
indoor air pollution
semivolatile compounds
TCEP
Opis:
Objectives: WHO's Children's Environment and Health Action Plan for Europe (CEHAPE) focuses on improvements of indoor environments where children spend most of their time. To investigate the relationship between school indoor air pollutants and cognitive performance in elementary school children, a multidisciplinary study was planned in all-day schools in Austria. Materials and Methods: In a cross-sectional study (LuKi study: Air and Children) indoor air pollutants were monitored in nine elementary all-day schools in urban and rural regions of Austria. In addition, school dust and suspended particulates ($\text{PM}_\text{10}$, $\text{PM}_\text{2.5}$) were measured, focusing on semivolatile compounds (e.g. phthalates, phosphororganic compounds [POC]). Health status and environmental conditions were determined by parents' questionnaire, cognitive function was measured by Standard Progressive Matrices (SPM). Results: Overall, 596 children (6-8 years of age) were eligible for the study. Cognitive tests were performed in 436 children. Analysis showed significant correlations of tris(2-chlorethyl)-phosphate (TCEP) in $\text{PM}_\text{10}$ and $\text{PM}_\text{2.5}$ and school dust samples with cognitive performance. Cognitive performance decreased with increasing concentrations of TCEP. Furthermore, cognitive function decreased significantly with increasing CO₂ levels. Conclusions: POC are widely used as plasticizers, flame retardants and floor sealing. This is the first report of a correlation between TCEP in indoor air samples and impairment of cognitive performance in school children. As a precautionary measure, it is recommended to prohibit the use of toxic chemicals and those suspected of a toxic potential in children's environments such as schools.
Źródło:
International Journal of Occupational Medicine and Environmental Health; 2013, 26, 4; 628-635
1232-1087
1896-494X
Pojawia się w:
International Journal of Occupational Medicine and Environmental Health
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Bilingualism and cognitive reserve: It’s a matter of top-down or bottom-up process
Autorzy:
Rees, Jessica
Boutris, Panagiotis
Bevan, Brodie
Izura, Cristina
Powiązania:
https://bibliotekanauki.pl/articles/1120854.pdf
Data publikacji:
2020
Wydawca:
Uniwersytet im. Adama Mickiewicza w Poznaniu
Tematy:
bilingualism
cognitive performance
Opis:
Cognitive performance declines with age following different trajectories. The cognitive trade-off, however, between age and cognitive reserve is still not clear. In addition, bilingualism has been thought to play a role in delaying cognitive decline by affecting cognitive control outside the scope of language. However, the effect has been unreliably reproduced and without exploring sufficiently the differences between cognitive functions that govern language control. In the current study 112 adults varying in age, level of bilingualism and cognitive reserve, completed a modified version of the Simon task, which engaged the mechanisms of interference suppression and shifting. Using ex-Gaussian analysis, the Simon effect was replicated in the normal component and the shifting effect was found in the exponential. Additional linear mixed-effects model analysis showed a significant “negative” effect of bilingualism on inhibition and a “positive” effect of cognitive reserve on shifting, both independent of age. Age affected similarly the speed of engagement of both executive functions irrespectively of language or cognitive background. Implications of a bilingual disadvantage and a beneficial effect of cognitive reserve during ageing are discussed.
Źródło:
Yearbook of the Poznań Linguistic Meeting; 2020, 6, 1; 113-158
2449-7525
Pojawia się w:
Yearbook of the Poznań Linguistic Meeting
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Effect of Age on Cognitive Performance Under the Impact of Vibration in a Driving Environment
Autorzy:
Muzammil, M.
Powiązania:
https://bibliotekanauki.pl/articles/90076.pdf
Data publikacji:
2004
Wydawca:
Centralny Instytut Ochrony Pracy
Tematy:
equivalent acceleration of vibration
difficulty index
driving environment
cognitive performance
reaction time
adaptacja człowieka do pracy
kierowcy i maszyniści
drgania
transport
czas reakcji
Opis:
The effect of organismic variable age on human cognitive performance was studied under the impact of vibration in different automobile driving environments, namely city streets, rural roads and highways. Reaction time was measured in milliseconds through a human response measurement system specifically designed for the purpose. Results of the study showed that age had a significant effect in city street and rural road conditions. It was also found that the level of equivalent acceleration of vibration and a difficulty index significantly affected cognitive performance in all driving conditions. The organismic variable age observed to have a significant effect on task performance implied that youngsters and older people are stressed differently in specific environments of driving so proper stress management strategies should be evolved for them in order to minimize the number of accidents.
Źródło:
International Journal of Occupational Safety and Ergonomics; 2004, 10, 4; 333-348
1080-3548
Pojawia się w:
International Journal of Occupational Safety and Ergonomics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Exercise and Heat-Load on Simple Reaction Time of University Students
Autorzy:
Chandra, A. M.
Ghosh, S.
Barman, S.
Iqbal, R.
Sadhu, N.
Powiązania:
https://bibliotekanauki.pl/articles/89834.pdf
Data publikacji:
2010
Wydawca:
Centralny Instytut Ochrony Pracy
Tematy:
reaction time
exercise
heat stress
cognitive performance
Opis:
Visual and auditory simple reaction times for both right and left hands of young university male students were recorded with a simple reaction timer, before and after an exercise schedule without and with elevated temperatures in a climatic chamber. The results indicated a decrease in both visual and auditory reaction times after the exercise, but a marked increase in them was noticed when exercise was performed at elevated temperatures. The difference in reaction times in preferred and nonpreferred hands was negligible at rest, i.e., without any exercise and elevated temperature. However, the difference was significant when exercise was performed at elevated temperatures. Visual reaction time was longer than auditory reaction time in all conditions. The results suggest that in hot industries, increased temperature has a specific rather than general effect on cognitive processes, perception and attentiveness, leading to increased chances of human errors, fatal accidents and loss of productivity.
Źródło:
International Journal of Occupational Safety and Ergonomics; 2010, 16, 4; 497-505
1080-3548
Pojawia się w:
International Journal of Occupational Safety and Ergonomics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Emergence of eSports Nutrition: A Review
Autorzy:
Ribeiro, Fernando J.
Viana, Victor M.
Borges, Nuno P.
Teixeira, Vitor H.
Powiązania:
https://bibliotekanauki.pl/articles/1339108.pdf
Data publikacji:
2021
Wydawca:
Uniwersytet Szczeciński. Wydawnictwo Naukowe Uniwersytetu Szczecińskiego
Tematy:
eSports
nutrition
eSports nutrition
video games
cognitive performance
Opis:
Peak cognitive performance is of paramount importance for the sports and competitive activities that depend on a high level of cognitive performance, such as eSports. The popularity of eSports has increased rapidly in recent years and will probably continue to rise in the forthcoming years. Above all, eSports practitioners require higher levels of cognitive abilities and motor skills for optimal performance and may benefit from adequate body composition and proper nutrition, as happens with more traditional athletes. However, there is a noticeable shortage of scientific knowledge in this area, including in nutritional-related aspects. Therefore, the objective of this non-systematic review is to summarize the nutritional strategies that may enhance health, cognitive performance, decrease reaction time and minimize fatigue. This information may be relevant for eSports competitors and set a base for further investigations, which could ultimately lead to the establishment of nutritional recommendations specific for this competitive population.
Źródło:
Central European Journal of Sport Sciences and Medicine; 2021, 33, 1; 81-95
2300-9705
2353-2807
Pojawia się w:
Central European Journal of Sport Sciences and Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The effect of air quality on sleep and cognitive performance in school children aged 10–12 years: a double-blinded, placebo-controlled, crossover trial
Autorzy:
Klausen, Frida B.
Amidi, Ali
Kjærgaard, Søren K.
Schlünssen, Vivi
Ravn, Peter
Østergaard, Kirsten
Gutzke, Vibeke H.
Glasius, Marianne
Grønborg, Therese K.
Hansen, Stefan N.
Zachariae, Robert
Wargocki, Pawel
Sigsgaard, Torben
Powiązania:
https://bibliotekanauki.pl/articles/2203016.pdf
Data publikacji:
2023-05-23
Wydawca:
Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
Tematy:
sleep quality
cognition
indoor air
CO2 exposure
school children
RCT study
Opis:
Objectives To investigate the effect of CO₂ during sleep on next-morning cognitive performance in young schoolchildren, the authors performed a double-blind fully balanced crossover placebo-controlled study. Material and Methods The authors included 36 children aged 10–12 years in the climate chamber. The children slept at 21°C in 6 groups each at 3 different conditions separated by 7 days in a random order. Conditions were as follows: high ventilation with CO₂ at 700 ppm, high ventilation with added pure CO₂ at 2000–3000 ppm, and reduced ventilation with CO₂ at 2–3000 ppm and bioeffluents. Children were subjected to a digital cognitive test battery (CANTAB) in the evening prior to sleep and on the next morning after breakfast. Sleep quality was monitored with wrist actigraphs. Results There were no significant exposure effects on cognitive performance. Sleep efficiency was significantly lower at high ventilation with CO₂ at 700 ppm which is considered to be a chance effect. No other effects were seen, and no relation between air quality during sleep and next-morning cognitive performance was observed in the children emitting an estimated 10 l CO₂ /h per child. Conclusions No effect of CO₂ during sleep was found on next day cognition. The children were awakened in the morning, and spent from 45–70 min in well-ventilated rooms before they were tested. Hence, it cannot be precluded that the children have benefitted from the good indoor air quality conditions before and during the testing period. The slightly better sleep efficiency during high CO₂ concentrations might be a chance finding. Hence, replication is needed in actual bedrooms controlling for other external factors before any generalizations can be made.
Źródło:
International Journal of Occupational Medicine and Environmental Health; 2023, 36, 2; 177-191
1232-1087
1896-494X
Pojawia się w:
International Journal of Occupational Medicine and Environmental Health
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Study of Computer-Based Task Performance Under Thermal Stress
Autorzy:
Chase, B.
Karwowski, W.
Benedict, M. E.
Quesada, P. M.
Irwin-Chase, H. M.
Powiązania:
https://bibliotekanauki.pl/articles/90836.pdf
Data publikacji:
2003
Wydawca:
Centralny Instytut Ochrony Pracy
Tematy:
dual task
thermal environment
cognitive performance
środowisko pracy
obciążenie cieplne
aklimatyzacja w wysokiej temperaturze
mikroklimat
Opis:
A visual-visual dual computer task was designed to test the effect of the thermal environment on dual task performance. The temperatures selected for testing were 20 and 35 °C Wet Bulb Globe Temperature (WBGT). 34 volunteers were randomly assigned to 1 of the 2 temperature conditions. Individual differences in single task performance were controlled by equating the baselines of single task performance. Once individual differences in single task capacity were con-trolled, statistically significant differences in performance were demonstrated. Mean Accuracy was computed over a 1-hr testing period in each temperature condition. Participants’ mean accuracy in the 35° condition (38.18%) was substantially lower than in the 20° condition (50.88%).
Źródło:
International Journal of Occupational Safety and Ergonomics; 2003, 9, 1; 5-15
1080-3548
Pojawia się w:
International Journal of Occupational Safety and Ergonomics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Human Performance Cognitive-Behavioral Modeling: A Benefit for Occupational Safety
Autorzy:
Gore, B. F.
Powiązania:
https://bibliotekanauki.pl/articles/89933.pdf
Data publikacji:
2002
Wydawca:
Centralny Instytut Ochrony Pracy
Tematy:
modeling system safety
human performance modeling
human factors methodology
bezpieczeństwo pracy
badanie czynności
komputer
czynnik ludzki
wspomaganie komputerowe
modelowanie działań ludzkich
narzędzia informatyczne
Opis:
Human Performance Modeling (HPM) is a computer-aided job analysis software methodology used to generate predictions of complex human automation integration and system flow patterns with the goal of improving operator and system safety. The use of HPM tools has recently been increasing due to reductions in computational cost, augmentations in the tools’ fidelity, and usefulness in the generated output. An examination of an Air Man-machine Integration Design and Analysis System (Air MIDAS) model evaluating complex human-automation integration currently underway at NASA Ames Research Center will highlight the importance to occupational safety of considering both cognitive and physical aspects of performance when researching human error.
Źródło:
International Journal of Occupational Safety and Ergonomics; 2002, 8, 3; 339-351
1080-3548
Pojawia się w:
International Journal of Occupational Safety and Ergonomics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Zmiany sprawności funkcji poznawczych w trakcie suplementacji wielonienasyconymi kwasami tłuszczowymi omega-3 w grupie chorych na schizofrenię – przegląd systematyczny
Changes in cognitive performance during supplementation with omega-3 polyunsaturated fatty acids in patients with schizophrenia – a systematic review
Autorzy:
Grancow-Grabka, Marta
Gmitrowicz, Agnieszka
Pawełczyk, Agnieszka
Pawełczyk, Tomasz
Powiązania:
https://bibliotekanauki.pl/articles/941068.pdf
Data publikacji:
2016
Wydawca:
Medical Communications
Tematy:
cognitive deficit
cognitive functions
omega-3 polyunsaturated fatty acids
schizophrenia
supplementation
deficyt poznawczy
funkcje poznawcze
schizofrenia
suplementacja
wielonienasycone kwasy tłuszczowe omega-3
Opis:
Cognitive function deficit is a constant phenomenon described in the population of patients with schizophrenia – in the premorbid period, during exacerbations and between the successive episodes. Cognitive dysfunction is an independent prognostic factor in schizophrenia. Studies indicate that this pathology dimension affects patient-functioning indicators, such as: treatment and rehabilitation outcomes, cooperation during treatment, professional, family and social functioning, the ability to live independently as well as the quality of life. Current methods for the treatment of schizophrenia fail to ensure sufficient improvement in this dimension of the disease. The usefulness of omega-3 polyunsaturated fatty acids, both as a monotherapy and an augmentation of antipsychotic treatment in schizophrenia, has been investigated during the last 25 years. The obtained results are inconclusive, however, a positive tendency in the outcomes related to symptomatic improvement have been observed. The effects of omega-3 polyunsaturated fatty acid supplementation on the cognitive functioning of patients diagnosed with schizophrenia has been relatively rarely evaluated. However, there is a theoretical rationale for the beneficial effect of omega-3 polyunsaturated fatty acid supplementation on cognitive function. The known effects of these substances that could contribute to the improvement in cognitive function include: immunomodulatory effects in the CNS, improvement of oxidative stress parameters, changes in neurotransmission as well as effects on neuroplasticity. The aim of this paper is to present a systematic review of research findings on the changes in cognitive performance in patients diagnosed with schizophrenia who receive omega-3 polyunsaturated fatty acid supplementation.
Deficyt w obszarze funkcjonowania poznawczego jest stałym fenomenem opisywanym w populacji osób z rozpoznaniem schizofrenii – w okresie przedchorobowym, w trakcie pogorszeń, jak również między kolejnymi epizodami. Zaburzenie funkcjonowania poznawczego stanowi niezależny czynnik rokowniczy w schizofrenii. Badania wskazują, że właśnie od tego wymiaru patologii zależą takie wykładniki funkcjonowania pacjentów, jak: wyniki leczenia i rehabilitacji, współpraca w leczeniu, funkcjonowanie zawodowe, rodzinne i społeczne, zdolność do samodzielnej egzystencji oraz jakość życia. Dotychczasowe metody leczenia schizofrenii nie zapewniają wystarczającej poprawy w zakresie tego wymiaru choroby. W okresie ostatnich 25 lat testowano użyteczność wielonienasyconych kwasów tłuszczowych omega-3 jako monoterapii oraz jako augmentacji leczenia przeciwpsychotycznego w schizofrenii. Uzyskane wyniki są niejednoznaczne, choć podkreśla się tzw. pozytywny trend uzyskiwanych wyników w zakresie poprawy objawowej. Stosunkowo rzadko oceniano wpływ suplementacji preparatami wielonienasyconych kwasów tłuszczowych omega-3 na funkcjonowanie poznawcze osób z rozpoznaniem schizofrenii. Korzystny wpływ suplementacji wielonienasyconymi kwasami tłuszczowymi na funkcjonowanie poznawcze ma uzasadnienie teoretyczne. Wśród znanych działań tych substancji mogących wpływać na usprawnienie funkcji poznawczych należy wymienić: działanie immunomodulacyjne w obrębie ośrodkowego układu nerwowego, poprawę parametrów stresu oksydacyjnego, zmiany w zakresie neurotransmisji oraz wpływ na procesy plastyczności neuronalnej. Celem niniejszej pracy jest przedstawienie systematycznego przeglądu wyników badań dotyczących zmian sprawności funkcjonowania poznawczego u osób z rozpoznaniem schizofrenii będących w trakcie suplementacji wielonienasyconymi kwasami tłuszczowymi omega-3.
Źródło:
Psychiatria i Psychologia Kliniczna; 2016, 16, 3; 155-159
1644-6313
2451-0645
Pojawia się w:
Psychiatria i Psychologia Kliniczna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Occupational Cognitive Failures and Safety Performance in the Workplace
Autorzy:
Allahyari, T.
Rangi, N. H.
Khalkhali, H.
Khosravi, Y.
Powiązania:
https://bibliotekanauki.pl/articles/90818.pdf
Data publikacji:
2014
Wydawca:
Centralny Instytut Ochrony Pracy
Tematy:
occupational cognitive failure
safety consequences
accident involvement
industrial workplace
wypadki przy pracy
stanowiska pracy
błąd człowieka
kwestionariusz
aspekt poznawczy
Opis:
Introduction. The majority of industrial accidents occur because of human errors. Human error has different causes, however, in all cases cognitive abilities and limitations of human play an important role. Occupational cognitive failures are cognitively-based human errors that occur at work. The aim of this study was to examine the relationship between occupational cognitive failures and safety consequences. Method. Personnel of a large industrial company in Iran filled out an occupational cognitive failure questionnaire (OCFQ) and answered questions on accidents. Univariate and multiple logistic regression analysis were used to determine the relationship between cognitive failures and safety consequences. Results. According to developed regression models, personnel with a high rate of cognitive failure, in comparison to low rate, have a high risk of minor injury involvement (OR 5.1, 95% CI [2.62, 10.3]); similar results were for major injury and near miss. Discussion. The results of this study revealed usefulness of the OCFQ as a tool of predicting safetyrelated consequences and planning preventive actions.
Źródło:
International Journal of Occupational Safety and Ergonomics; 2014, 20, 1; 175-180
1080-3548
Pojawia się w:
International Journal of Occupational Safety and Ergonomics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Performance Evaluation of Cognitive Radio Network Based on 2-D Markov Chain
Autorzy:
Islam, M. I.
Rabbi, M. F.
Khan, R. T.
Akhter, J.
Powiązania:
https://bibliotekanauki.pl/articles/958115.pdf
Data publikacji:
2015
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
cognitive radio networks
misdetection
probability of false alarm
throughput and traffic of limited channel
Opis:
The objective of cognitive radio network is to enhance the wireless network spectrum utilization. In such a network, two types of users are enlisted, namely primary user (PU) and secondary user (SU). The PU can access any channel in case of its availability, but SU users have lower priority and can access a channel only when it is unused by PUs. The performance of such a network solely depends on two traffic parameters: probability of false alarm and probability of misdetection. In this paper the performance of such a network is analyzed based on two dimensional Markov chain including those parameters. The main contribution of this paper is to evaluate blocking probability and PU and SU throughput using the state transition chain instead of existing statistical analysis.
Źródło:
Journal of Telecommunications and Information Technology; 2015, 3; 39-44
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Practical measures of cognitive function and promotion of their performance in the context of research
Autorzy:
Gujski, Mariusz
Juńczyk, Tomasz
Pinkas, Jaroslaw
Owoc, Alfred
Bojar, Iwona
Powiązania:
https://bibliotekanauki.pl/articles/989037.pdf
Data publikacji:
2016
Wydawca:
Instytut Medycyny Wsi
Tematy:
cognitive function
cognitive reserve
prevention
training programmes
Opis:
The aging of the population generates a number of very interesting research questions in the fields of medicine, psychology, sociology, demography, and many others. One of the issues subject to both intensive research by scientists and exploration by practitioners is associated with cognitive functions. The article presents current knowledge regarding practical actions in the field of promoting cognitive function using diagnostic programmes and training using modern technologies. An important aspect presented in this study is also related to the welfare of the maintenance or improvement of cognitive function. Information and communication technologies will contribute to the dissemination of computerized cognitive training, also personalized.
Źródło:
Annals of Agricultural and Environmental Medicine; 2016, 23, 3
1232-1966
Pojawia się w:
Annals of Agricultural and Environmental Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
COGNITIVE FUNCTIONING AND SAFETY DETERMINANTS IN THE WORK OF A TRAIN DRIVERS
Autorzy:
Kata, Grzegorz
Poleszak, Wiesław
Powiązania:
https://bibliotekanauki.pl/articles/2138040.pdf
Data publikacji:
2021-06-26
Wydawca:
Fundacja Edukacji Medycznej, Promocji Zdrowia, Sztuki i Kultury Ars Medica
Tematy:
railway traffic safety
train driver’s performance
cognitive functioning
eye-tracking
Opis:
The reports of committees investigating the causes of rail accidents indicate the significance of the so-called human factor (e.g. UTK, 2019). In addition to issues related to perso nality functioning, the organization and culture of work, this also includes variables related to the cognitive functioning of train drivers themselves. These are significant factors that determine the occurrence of accidents that result from ignoring or not spotting railway signals and signs. The purpose of this study was to verify the relationship between cognitive functioning and safety determinants, which was measured using an eye-tracking technique. The application of this technique was intended to check its usefulness in the field of railway traffic safety and to achieve an approximate simulation environment of the real working conditions of a train driver. In the present study, the Vienna Test System was used as a me - thod for the determination of cognitive functioning. Based on the variables described in the subject literature, the following tests were applied: Determination Test, Visual Memory Test, Visual Pursuit Test, Reaction Time, Cognitrone, Signal Detection and Vigilance. In addition to computer cognitive tests, an eye-tracking test method was designed based on a film recorded in real train-driving situation. Measures describing areas of interest (AOI) that are crucial for safety were analysed. Due to the pilot nature of the research, only 10 passenger train drivers participated in the study. The results of the study showed a link between the cognitive functioning of the train drivers and visual security determinants. Significant correlations were found with stress tolerance resulting from cognitive overload, visual memory, alertness and concentration ability under time pressure. The study confirmed the significant role of the train driver's cogni- tive functioning in the analysis and perception of safety-critical signals. The use of an eye-tracking method has delivered results that are in agreement with studies based on other methods. This pro- vides a sound basis for the continuation of research using eye- tracking in the assessment of rail transport safety. In the future, the research should be extended to include an analysis of the effect of demographic and situational variables (types of signalling devices and signage) and a broader model of the relationship between cog- nitive functioning and the driver's visual attention. This will provide data that is crucial for the prevention of railway incidents and the development of training plans for train drivers.
Źródło:
Acta Neuropsychologica; 2021, 19(2); 277-289
1730-7503
2084-4298
Pojawia się w:
Acta Neuropsychologica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Cognitive Function in Tropical Climate
Autorzy:
Robin, Nicolas
Coudevylle, Guillaume
Powiązania:
https://bibliotekanauki.pl/articles/1177787.pdf
Data publikacji:
2018
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Heat stress
cognition
mental performance
task complexity
tropical climate
Opis:
The physiological and psychological responses to environmental heat stress have been well established. However, in the tropical climate (i.e., hot: 31 ±2 °C and wet climatic environment: 75% ± 10% rH), that concerns millions of people, most studies deals with exercise: Aerobic exercise is negatively affected and the impact of this environment on cognition is unclear. This short communication reviews some studies using cognitive tasks realized in tropical climate or using environmental conditions leading heat stress. In agreement with the literature, it is suggested that, at school, office or university in tropical climates, it is preferable to study in air conditioning or naturally ventilated rooms than in hot and wet climatic conditions in order to reduce feelings of fatigue and thermal discomfort. Further investigations, using cooling or psychological training techniques are needed in order to try to limit the negatives effects of tropical climate on cognition.
Źródło:
World Scientific News; 2018, 100; 244-247
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Performance Analysis of the Cognitive Radio Network with Opportunistic Spectrum Access
Autorzy:
Chęciński, R.
Kaszuba-Chęcińska, A.
Kryk, M.
Łopatka, J.
Malon, K.
Skokowski, P.
Powiązania:
https://bibliotekanauki.pl/articles/226072.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
MANET
cognitive radio
dynamic spectrum access
USRP
RF switch matix
real time demonstrator
Opis:
Efficient access to the spectral resources becomes a challenge for future military wireless communication systems. It requires spectral situation awareness, knowledge of current regulations, local policies and hardware platform limitations. It can be achieved by cognitive radios, realizing cognitive cycle, consisting typically of continuous observation, orientation, reasoning and decision making. All these elements must be realized in parallel and shouldn't interfere with each other. Even more difficult issue is related with cooperation between different nodes, especially in wireless domain, in harsh propagation conditions. Unpredictable phenomena create hard conditions for all deterministic behavior models, and their reproduction is a key element for efficient operation of the network. Very popular computer simulations are always simplified, and real time implementation gives an opportunity to make the next step in system elaboration. This paper presents a real-time demonstrator of cognitive radio network. It can work both in wired mode, using radio channel emulator and in mobile mode, to verify influence of real conditions on proposed cognitive solutions and assess their effectiveness.
Źródło:
International Journal of Electronics and Telecommunications; 2018, 64, 1; 51-56
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 20

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