Electric Signs Research Articles

Design Method of Electric Bicycle Traffic Signs Using Particle Swarm Optimization with Convolutional Neural Network

Design Method of Electric Bicycle Traffic Signs Using Particle Swarm Optimization with Convolutional Neural Network

Hypokalemia : what correlation with psychotic relapse ?

IntroductionHypokalemia is often detected on standard biological assessments of patients hospitalized for psychiatric disorders. Many explanations are advanced by clinicians like insufficient food intake or drug effects. But what if there was a relationship between this ionic disorder and psychotic relapses?ObjectivesTo assess the frequency of hypokalemia in patients hospitalized for a psychotic relapse and to study its relationship with certain clinical characteristics.Methods This is a cross-sectional study conducted over a 3-month period (july-september 2021), including 37 male patients diagnosed with schizophrenia and hospitalized in a psychiatric unit for a psychotic relapse. Patients had blood collection before medication that was sent for a complete blood count and blood chemistry testing.ResultsBlood potassium level ranged from 2.92 to 4.87 mmol/L with an average of 3.74 mmol/l. Half patients ( 54.1% , N=20 ) had hypokalemia. Among them, two had electric signs on their ECG and two had physical symptoms. In patients with hypokalemia, the cause of hospitalization was the agitation in 80% of cases versus 58.8% in patients with normal potassium levels. The correlation was not significant between hypokalemia and the use of a restraint (p=0.160) or the somatic history (p=0.495).Conclusionshypokalemia is an ionic disorder that should be detected in patients with schizophrenia. It exposes the patient to the risk of a sudden death, especially with use of antipsychotics that are at a high risk for torsade de pointes.DisclosureNo significant relationships.

Piezoelectric Devices in Biomedical Applications

Piezoelectricity is a nature of material imbalance that prompts the change of electric signs into actual misshaping and on the other hand actual deformity into an electric sign. The past decade has witnessed significant advances in medically

Morphological cardiac changes in electrocution deaths: A literature review.

Electrical injury may lead to damage to the conducting tissue, myocardial changes and even sudden cardiac death. Victims of low-voltage electrocution may have no electric marks, burns or other signs typical of electrical injuries. In these cases, the absence of other specific findings could make the identification of the cause of death very difficult. A broad spectrum of cardiac changes in cases of electrocution has been described in the literature, including the break-up of myocardial fibres, cardiomyolysis, haemorrhagic areas, the separation of myofibres and alternating hypercontracted-hyperdistended myocytes. All the described alterations, however, cannot be exclusively attributed to electrocution, since no specific morphological cardiac findings have so far been identified in electrocution. However, a few histological patterns recur, and their knowledge may be important for the forensic pathologist. This literature review describes the main pathological patterns observed in cases of fatal electrocution based on a literature search carried out up to September 2019 in the databases PubMed and Scopus. The search criteria included the keywords for cardiac lesions and electrocution. On the grounds of the literature data, a list of major and minor diagnostic markers for the passage of the electrical current through the heart tissue was created.

Analysis of runaway electron discharge formation during Joint European Torus plasma start-up

Joint European Torus (JET) plasma initiations that form a significant quantity of runaway electrons have been studied. It is shown that there is no direct relationship between the prefill pressure and breakdown electric field and signs of runaway electrons during the plasma initiation. Runaway electron generation is determined by the electric field and density development at and after burn-through. A clear criterion of density and electric field at one given point in time, which would ensure the avoidance of runaway electron generation, cannot be determined, because the timescales for the formation of runaway electrons and for the dynamics of the density differ significantly. Moreover, the formation process can be reversed, reducing the influence of runaway electrons on the discharge. Ensuring a high enough density will reduce the likelihood that runaway electron discharges are formed. It is also found that at JET the electric field often exceeds the critical electric field during the early stages of the current ramp-up phase, even when no signs of runaway electrons are present. Expected runaway current dynamics have been analysed using the discharge circuit equation. The comparison of the expected runaway electron current dynamics shows it to be significantly slower compared to theoretical expectations in the presence of a hot and dense thermal background plasma. This could be explained by an enhanced critical electric field and/or a reduced confinement of runaway electrons. The latter is shown to be affected by bursts of magnetohydrodynamic activity that are characteristic during the current ramp-up. The development of discharges in which the current is fully carried by runaway electrons happens on a slow timescale of several seconds, limited by the available flux. Such timescales are sufficient for improved active control of these events, avoiding runaway currents at plasma initiation exceeding values at which they could damage in-vessel components. The results provide insight into the improvement and interpretation of self-consistent modelling of runaway electron generation during the start-up of International Thermonuclear Experimental Reactor discharges.

Understanding Electrocardiography in Adult Patients With Congenital Heart Disease

ImportanceCongenital heart disease in adults is still a relatively new concept for many cardiologists, and the complexity as well as diversity of cardiac phenotypes encountered necessitate that systematic, practical information be available for the nonspecialist. The analysis of the 12-lead electrocardiogram is an invaluable cornerstone in the clinical appraisal of these patients.ObservationsConsideration of the main anatomic and pathophysiological aspects of the various congenital heart conditions can shed light on their distinctive electrocardiogram patterns, which are an electrical reflection of intrinsic cardiac anatomy abnormalities, surgical scarring, and progressive cardiac remodeling attributable to hemodynamic perturbations. While congenital heart disease may be diagnosed or suspected on electrocardiogram observation in adults who are previously undiagnosed, specific markers have also been identified to optimize risk stratification in certain defects.Conclusions and RelevanceThis review outlines that main electrocardiogram patterns in adult patients with congenital heart disease can be appreciated by the understanding of the underlying pathophysiology. Periodic surveillance is of particular importance in this population to unmask early electric signs of disease evolution.

Machine Learning Based Classifier for Falsehood Detection

The investigation of physiological techniques for Falsehood identification tests utilizing the enthusiastic aggravations started as a part of mid 1900s. The need of Falsehood recognition has been a piece of our general public from hundreds of years back. Different requirements drifted over the general public raising the need to create trick evidence philosophies for Falsehood identification. The established similar addressing tests have been having a tendency to gather uncertain results against which new hearty strategies are being explored upon for acquiring more productive Falsehood discovery set up.Electroencephalography (EEG) is a non-obtrusive strategy to quantify the action of mind through the anodes appended to the scalp of a subject. Electroencephalogram is a record of the electric signs produced by the synchronous activity of mind cells over a timeframe. The fundamental goal is to accumulate and distinguish the important information through this action which can be acclimatized for giving surmising to Falsehood discovery in future analysis.This work proposes a strategy for Falsehood discovery utilizing EEG database recorded on irregular people of various age gatherings and social organizations. The factual investigation is directed utilizing MATLAB v-14. It is a superior dialect for specialized registering which spares a considerable measure of time with streamlined investigation systems. In this work center is made on Falsehood Classification by Support Vector Machine (SVM). 72 Samples are set up by making inquiries from standard poll with a Wright and wrong replies in a diverse era from the individual in wearable head unit. 52 samples are trained and 20 are tested. By utilizing Bluetooth based Neurosky’s Mindwave kit, brain waves are recorded and qualities are arranged appropriately. In this work confusion matrix is derived by matlab programs and accuracy of 56.25 % is achieved.

Axonal Neuropathy as a Rare Side Effect of Sulfasalazine

Sulphasalazine, one of the 5-aminosalicylates, is widely used for the treatment of inflammatory bowel diseases and arthritis. Beside its classic adverse effects like blood dyscrasias and hepatic failure, peripheral neuropathy has been reported as a rare adverse drug reaction to sulphasalazine. The mechanism of this neurotoxicity is unknown tell nowaday. We report a case of neurotoxicity that occurs after prolonged use of sulphasalazine. Previously, reported cases of neurotoxicity have not shown improvement of electric signs in nerve conduction study after stopping treatment.

비전도성 벽과의 상호작용에 따른 한 쌍 입자의 직류 유전영동 운동

The present study numerically investigated two-dimensional dielectrophoretic motions of a pair of particles suspended freely in a viscous fluid, interacting with a nearby nonconducting planar wall, under an external uniform electric field. The results show that the motions depend strongly on the set of two electric conductivity signs and the particles-wall separation gap. When both particles have the same sign, they revolve and finally align parallel to the electric field. In contrast, with different signs, they revolve in the opposite direction and finally align perpendicular to the field. Simultaneously, they are repelled to move farther away from the wall regardless of their conductivity set. With further separation from the wall, the particles-wall interaction effect diminishes and tthe particle-particle effect dominates.

Saving The Union: Solomon Schechter And Abraham Lincoln

“From roof tops and windows throughout the city flags waved in the breeze yesterday in honor of Lincoln’s memory,” the New York Times wrote on February 13, 1909. “At night,” the story continued, “when darkness shut out the sight of the flag display, electric signs on a few of the ‘skyscrapers’ told those in the streets that Lincoln’s memory was still being honored. On the top of Times Building the name ‘Lincoln’ in electric letters shone out conspicuously and could be seen for many miles. Just below, and on the top of the extention were two crossed flags in electric lights. These too, could be seen for miles.”2 Scenes like that played out all over the city, the entire United States, even throughout the world, honoring Lincoln for his character and for his vocation, for his wisdom and kindness, for his saving the Union and emancipating the slaves, above all for his sacrificing his life for the nation. Everyone, from soon to be outgoing President Theodore Roosevelt to Leo Tolstoy, eulogized the martyred hero of the republic. Roosevelt drew on his own memories, that of a six-year old boy in Manhattan who watched the funeral cortege process down Broadway, and who as an adult wore a ring bearing a few strands of Lincoln’s hair. He placed Lincoln in that most select of company, that of George Washington, as one of the two greatest Americans. The patrician lauded the humble hero of modest background “power was his, but not pleasure … [he] never faltered as he bore for a burden the destinies of his people.”3 Tolstoy painted Lincoln on an even larger canvas, that of world history, amidst the pantheon of giants like Alexander and Caesar, Frederick the Great, and Napoleon. They all lagged behind Lincoln in moral power, advanced the novelist, “in depth of feeling and in a certain moral power … he was a Christ in miniature, a saint of humanity.”4

Study of Acoustic Emission in a Compression Test of Andesite Rock

In the compression test of a material's sample, elastic waves produced by dynamic processes are known as acoustic emissions (AE). These waves, which propagate from the source to the material surface, arrive to the piezoelectric sensor where they are converted to electric signs and transformed into the typical AE parameters. These parameters will be employed for the evaluation of failure mechanisms present in the test. In this work, the mechanic behaviour of andesite's rocks of Cerro Blanco, San Juan, Argentina was studied. Two compression tests were performed for two cylindrical rock samples and the AE parameters were measured. The measurement configuration consisted of two syntonized sensors at 60kHz and 150kHz placed on the lateral face of the sample. The AE parameters registered were amplitude, duration, energy, RMS, etc. This data group was related to the load–time curve. Different indicators like average frequency and the ratio of rise–time to amplitude of the signal were calculated. These indicators were analyzed and evaluated with the purpose of identifying the damage level and the type of failure.

Development and Evaluation of a Green Wave Control Algorithm Based on Two-Way Bandwidth Maximization for Transit Signal Priority

A good traffic signal design is one of the key solutions to many transportation problems. A two-way green wave control strategy for transit signal priority is reviewed and evaluated in this paper. Considering the traffic tidal phenomenon along the arterial roads during rush hours, a directional transit signal priority algorithm depend on the passenger flow has been developed for the coordination in signalized intersections. The algorithm provides signal timing plans for each intersection and the optimal bus speed along each section based on two-way bandwidth maximization. The strategy was designed to provide sectional control on transits, using electric signs and existing traffic control devices. In this paper, the strategys efficiency was evaluated using VISSIM micro-simulation along an arterial road which contains five intersections and serves more than ten bus lines. Actual data was used in the simulation. The simulation results show that the presented algorithm can effectively improve the operation efficiency of the transit system. This green wave control strategy reduced the number of stops by 34 % to 47 % and travel delay time by 27 % to 30% of the transit, while restricting the impact on vehicular traffic to the minimum. Moreover, the number of stops and travel delay time of vehicular traffic actually got a slight decrease. The algorithm shows promising results, and with minor upgrades, it can be applied to any type of intersection.

Electric Vehicle Charging Station Signs: An Evaluation of Driver Comprehension and Perceived Risk

As drivers continue to purchase electric vehicles, there is an increasing demand for electric vehicle charging stations and, consequently, signing for these stations. Previous research evaluated a sign which was recommended to the Manual on Uniform Traffic Control Devices (MUTCD) team for addition to the MUTCD; however there remained concerns that drivers’ perceptions of electric vehicle charging stations signs had not been adequately addressed. The present research focused on driver comprehension and perceived risk of electric shock in regard to two electric vehicle charging station signs. Members of the driving public completed a computer-based survey which consisted of open-ended questions, rating tasks, and ranking tasks. Drivers did not necessarily associate a risk of electric shock with electric vehicle charging stations. In fact, nearly 100 percent reported that they would feel comfortable using a public electric vehicle charging station. When asked specifically about the risk of electric shock, statistically significant differences in sign alternatives arose only in the risk of electric shock implied by the sign. Further, drivers perceived the risk of shock from using an electric vehicle charging station as lower than many commonly used items which contain an electric charge (e.g., toaster, hair dryer, and extension cord). Given that both alternatives were well comprehended, either sign is suitable for use.

Tetralogy of Fallot with an abnormal coronary artery: surgical options and prognostic factors

The objectives were to determine in patients with Tetralogy of Fallot (ToF) and abnormal coronary artery (ACA): the long-term outcomes of different surgical strategies; the risk factors for right ventricular outflow tract (RVOT) obstruction, reoperation, heart failure and mortality. To date, the surgical strategies and prognostic factors for repair of ToF with an ACA, crossing the RVOT and avoiding a classic repair, have not been evaluated in a large series using a multivariate analysis. A retrospective study (1986-2011) included 72 patients. The mean follow-up was 9.6 ± 6.8 years. Median age at surgery was 1.5 years (0.2-11.3). The main surgical techniques were 'tailored' right ventriculotomy and patch of the RVOT (63%; n = 45), implantation of a conduit between the right ventricle (RV) and the pulmonary artery (PA; 25%; n = 18) and a transatrial ± transpulmonary approach (11%; n = 8). Univariate and multivariate logistic regression analyses were performed. Intrahospital mortality was 2.7%. Actuarial freedom from reoperation and actuarial survival at 15 years were 77% (confidence interval [CI]: 70-83%) and 94% (CI: 90-97%), respectively. Reoperations occurred more frequently after conduit implantation (50%) than after patch reconstruction (17%) or transatrial ± transpulmonary approach (0%; P = 0.002). The transatrial ± transpulmonary approach was significantly less complicated, with a long-term RVOT obstruction of 0% compared with the other surgical techniques (45.4%; P = 0.03). Implantation of a RV-PA conduit was an independent risk factor for RVOT obstruction (odds ratio [OR]: 31; P < 0.001) and reoperation (OR: 20; P = 0.02). An immediate postoperative right ventricle/left ventricle (RV/LV) pressure ratio >0.5 was independently associated with a long-term RV/LV pressure ratio >0.5 (OR: 14; P = 0.001), but was not a risk factor for reoperation (P = 0.8). Postoperative electric ischaemic signs independently increased the risk of long-term heart failure (OR: 22; P = 0.04). The transatrial ± transpulmonary approach displays the best long-term outcomes, by reducing the risks for RVOT obstruction and reoperation, but does not improve the patient survival. A RV-PA conduit was an independent risk factor for RVOT obstruction and reoperation. An immediate postoperative RV/LV pressure ratio >0.5 was not a risk factor for reoperation. The transatrial ± transpulmonary approach should be preferred to the implantation of a conduit or a tailored right ventriculotomy whenever possible.

Prospección arqueológica en América Central mediante el uso de métodos geofísicos

Los métodos geofísicos de prospección son considerados como una herramienta importante en ladetección arqueológica ya que permite detectar y parametrizar los restos de estructuras enterradas gracias al es-tudio de algunas de las propiedades físicas del mismo. El análisis numérico de las señales eléctricas, magnéticas y electromagnéticas, productos de la aplicación de las técnicas de cartografía y perfilaje en dos sitios arqueológicamante importantes de la región centroamericana que se presentan en este artículo, ha permitido poner enevidencia el contraste en las propiedades físicas de los restos arqueológicos así como del suelo adyacente.

Socialism and Occultism at the Fin de Siècle : Elective Affinities

La Bus (1891), J.K. Huysmans's fictional account of occultism in France at fin de siecle, charismatic decadent des Hermies recommends that in order avoid horrors of daily life, his friend Durtal keep his eyes fixed on pavement. When do that, he explains, you see reflections of electric signs which assume all manner of shapes: alchemical symbols, armoral bearings of alchemists on raised plinths, cog-wheels, talismanic characters, bizarre pentacles with suns, hammers and anchors (2^0). As this compendium of material and immaterial images glimpsed in reflective gleam of metropolitan street suggests, for des Hermies, occult is not simply an escape from quotidian; it is indissociable from it. Materialist and spiritualist signs are inseparable. In Oscar Wilde's play LadyWindermere s Fan (1892), Lord Darlington famously declares that we are all in gutter, but some of us are looking at stars (III. 30^). Where Wilde separates supramundane from mundane, Huysmans makes them mutually implicit: des Hermies can see constellations in gutter. In a previous chapter of La Bas, des Hermies had emphasized how interrelationship of positivism and mysticism in contemporary Paris, apparently so incongruous, in fact typified the tail-ends of centuries: Magic flourishes when materialism is rife (219). In febrile atmosphere of late-nineteenth century London, too, magic flourished alongside its old frere ennemi. It is not simply that occultism was a reaction against increasingly discredited materialism of nineteenth century. Their relationship was more dialectical than that. At a collective level, it was perhaps closer to what Freud called a reaction-formation, a compensatory response that represses its complicity with phenomenon that it constitutes as its opposite (93-94). As an exoteric movement, spiritualism had for almost half a century been infatuated with problem of providing empirical evidence for afterlife. In late nineteenth century, esoteric movements such as theosophy, which self-consciously appropriated aspects of spiritualism that it sought to displace, also sought material proof of immaterial. If, therefore, fin de siecle was characterized, as Terry Eagleton

Modern Times: The Untold Story of Modernism in Australia (review)

Reviewed by: Modern Times: The Untold Story of Modernism in Australia Robert Dixon Modern Times: The Untold Story of Modernism in Australia. Ann Stephen, Philip Goad, and Andrew McNamara, eds. Carlton, Vic.: Miegunyah Press in association with Powerhouse Publishing, 2008. Pp. xxxiii + 253. $72.40 (Paper). Modern Times follows an earlier collection of primary sources by the same editors and publisher, Modernism and Australia: Documents on Art, Design and Architecture, 1917–1967 (2006). In Australia it is accompanied by an eponymous travelling exhibition that opened at the Powerhouse Museum, Sydney, in August 2008, where Ann Stephen is curator. Reviewers of the earlier volume read it, incorrectly, as elaborating Bernard Smith's received account of the Australian reception of modernism in Australian Painting (1962) as a series of belated, style-based shifts occurring discretely within painting, sculpture, design, and architecture. Accordingly, in their introduction to Modern Times, the editors stress that the essays collected here tell, "for the first time", another, "untold" history of Australia's informed engagement with modernism as an international, interdisciplinary project spanning five decades, from 1917 to 1967. The twenty-five essays collected here deal with the popular reception of "modernism"—or "modernity"—in and range of media, including painting, architecture, design, fashion, photography, [End Page 256] and advertising; and a range of sites, such as skyscrapers, exhibitions, factories, milkbars, and suburban swimming pools. They are divided into five thematic, roughly chronological sections: "Abstract in Australia," "Bodies & Bathers," "City Living," "Designs on the Space Age," and "Electric Signs & Spectacles." As in many wide-ranging collections with multiple authors, however, the editors' initial arguments about modernism and social modernity, cultural nationalism and internationalism, and the belatedness or otherwise of provincial cultures, tend to drop in and out of their contributors' essays, varying as they do in content, length, and approach. Their argument is cogently demonstrated, for example, in several of the essays in "Abstract in Australia," including Andrew McNamara's "The Bauhaus in Australia," Annabel Pegus's "Colour in Art," and Heather Johnson's "Modern Rooms." These essays use prosopography—so common now in transnational histories—to trace modernism's flows of people, texts, and ideas across national borders, as seen in a series of exhibitions in Sydney and Melbourne from the 1910s to the 1960s: Roland Wakelin and Roy de Maistre's "Colour in Art Exhibition" (1919); de Maistre's contribution to Sydney Ure Smith's Burdekin House Exhibition (1929); Alleyene Zander's incorporation of locally made furniture in her Exhibition of British Contemporary Art (1933); and the involvement of Ludwig Hirschfeld-Mack, a former Bauhaus teacher who came to Australia in 1940, in Clement Meadmore's "The Bauhaus: Aspects and Influence" (1961). Pegus demonstrates that de Maistre's experiments with colour were contemporary with similar experiments in London and Paris, while Meadmore's internationalism made him unconcerned with what he called the "geographical thing" (5): that is, the "nationalist modernism" of the Antipodeans. While the careers of de Maistre, Hirschfeld-Mack, Margaret Preston, John Power, Wolfgang Sievers, and Harry Seidler confrm modernism's international project, these essays by and large focus on the Australian phase of their careers, paradoxically giving the book a national frame of reference – de Maistre, for example, plays no part in the narrative after his departure for London in 1930, where he associated with Francis Bacon, Herbert Read, and Patrick White. Stephen's essay, "The Body at the Scene of Modernism," serves as an introduction to the essays in Part 2, outlining the theme of "embodied modernism." Her arguments about the body, the body image and mass consumption, exemplified by the Berlei lingerie company's mechanical figure-type indicator, suggest Tim Armstrong's influential formulation of "prosthetic modernity."1 This usefully draws together a range of examples from many fields of practice—from X-rays in medical practice and avant-garde photography, to the migration of Max Dupain's nudes from modernist art photography to advertising and erotica—but the argument might be sharpened by a distinction between forms of high modernism and what cinema historian Miriam Hansen terms "vernacular modernism."2 The connections—as well as the discontinuities—between these domains of practice are reflected in the content and approach of...

093 Look on the hold of heart failure management in Morocco, about 294 patient

the objective was to identify the epidemiological, clinical and the outcome of heart failure (HF) in a Moroccan hospital. A retrospective study using a serie of 294 patients hospitalized in our service from January 2005 to December 2008. The HF occupies 14% of hospitalizations. The mean length of stay was 14 ± 3.1 days. The mean age was 58 ± 11.5 years. Men were mostly represented with a ratio H / F = 3.5. The main cardiovascular risk factor was smoking (55%) followed by hypertension (40%) and diabetes (35%). Dyspnea was the main symptom reported in 91% of the cases. The clinical presentation was that of left (65%), right (22%) and global(23%) HF. Among electric signs, we found Atrial fibrillation (30%), a Q-wave (58%) and left ventricular hypertrophy (28%). the chest x-ray showed a cardiomegaly (89%) and signs of pulmonary overload (86%). Biology showed electrolyte abnormalities in half of the cases, renal failure (35%) and anemia (28%). In echocardiography, the mean left ventricular ejection fraction (LVEF) was 34.5 ± 5.4%. LVEF was > 45% for 26% of patients. 134 patients underwent a coronary angiography which objectified coronary damage in 84% of the cases. The main causes were ischemic heart disease (42%), valvular heart disease(24%) and hypertension (13%). most used drugs were angiotensin converting enzym inhibitors and diuretics. 21% of patients underwent a mitral valve replacement with mechanical prosthesis. Among patients with coronary artery disease, 33% were revascularized by coronary bypass (21%) and coronary angioplasty (12%). Cardiac resynchronization was performed for 19 patients using implantable automatic defibrillator for 3 of them.Hospital mortality was 10%. The main features of this population is the relatively young age, male predominance, ischemic heart disease as a leading cause and low rate of HF with preserved systolic function.

"From over-sweet cake to wholemeal bread": the Home &amp; Building years: New Zealand Architecture in the 1940s

In 1940, when Helen Gosset, writing for the New Zealand Home &amp; Building, asked her readers to "[a]nalyze for a moment the intricate exterior design which meets one's eye from the streets of a modern city," she gave a vivid account of urban life of that decade:A complexity of motor wheels, iron girders, tall window - dotted buildings, flashing electric signs, vivid shop windows, traffic signals, and as a back drop for all this, the bustle of modern industry. These things make up the lives of moderns. Is it any wonder that they find a certain comfort in straight lines and the absence of ornament?

Simulação da visão das cores: decodificando a transdução quântica-elétrica

We propose an experimental simulation, using accessible and low cost materials, on the biophysical mechanism of the color vision in accordance with the Young-Helmholtz s Trichromatic Theory, approaching mainly the coding and decoding process of electric signs that arrive to the cerebral cortex. The stimulus that unchains this process is given through transformation of the quantized energy of a light photon that takes place in the photocells of the retina of the human eye. The construction of a simple system of collection and analysis of data, using a multimeter, filters, LDR and LEDs allows us to establish connections between the visual system and the simulation model.