ABSTRACT
Visible Light Communications (VLC) is a cutting edge technology for data communication that is being considered to be implemented in a wide range of applications such as Inter-vehicle communication or Local Area Network (LAN) communication. As a novel technology, some aspects of the implementation of VLC have not been deeply considered or tested. Among these aspects, security and its implementation may become an obstacle for VLCs broad usage. In this article, we have used the well-known Risk Matrix methodology to determine the relative risk that several common attacks have in a VLC network. Four examples: a War Driving, a Queensland alike Denial of Service, a Preshared Key Cracking, and an Evil Twin attack, illustrate the utilization of the methodology over a VLC implementation. The used attacks also covered the different areas delimited by the attack taxonomy used in this work. By defining and determining which attacks present a greater risk, the results of this work provide a lead into which areas should be invested to increase the safety of VLC networks.
Subject(s)
Communication , Computer Security , Light , Local Area NetworksABSTRACT
Due to the massive insertion of embedded cameras in a wide variety of devices and the generalized use of LED lamps, Optical Camera Communication (OCC) has been proposed as a practical solution for future Internet of Things (IoT) and smart cities applications. Influence of mobility, weather conditions, solar radiation interference, and external light sources over Visible Light Communication (VLC) schemes have been addressed in previous works. Some authors have studied the spatial intersymbol interference from close emitters within an OCC system; however, it has not been characterized or measured in function of the different transmitted wavelengths. In this work, this interference has been experimentally characterized and the Normalized Power Signal to Interference Ratio (NPSIR) for easily determining the interference in other implementations, independently of the selected system devices, has been also proposed. A set of experiments in a darkroom, working with RGB multi-LED transmitters and a general purpose camera, were performed in order to obtain the NPSIR values and to validate the deduced equations for 2D pixel representation of real distances. These parameters were used in the simulation of a wireless sensor network scenario in a small office, where the Bit Error Rate (BER) of the communication link was calculated. The experiments show that the interference of other close emitters in terms of the distance and the used wavelength can be easily determined with the NPSIR. Finally, the simulation validates the applicability of the deduced equations for scaling the initial results into real scenarios.
ABSTRACT
Paciente de 34 años que, tras un continuo de visitas médicas a diferentes especialidades, consulta en la unidad de psiquiatría por bullying (acoso escolar). El principal motivo de acoso, exclusión y burla es el olor corporal que desprende. La remisión de informes de otras especialidades nos indica que queda descartada cualquier afección dermatológica y ninguna de las otras enfermedades propuestas por la paciente. La entrevista clínica psiquiátrica, así como la utilización de otras técnicas de evaluación y diagnóstico, nos sugirió la realización de un diagnóstico diferencial entre el cuadro obsesivo compulsivo y la psicosis monosintomática.
A 34 year old patient who was seen in the Harassment Psychiatry Unit after a series of medical visits to different specialties. The main reason for his harassment, exclusion and derision was due to his body odor. The reports issued by the other specialties ruled out any dermatological pathology, and any of the other conditions proposed by the patient. The psychiatric clinical interview, including the use of other evaluation and diagnostic techniques, suggested a differential diagnosis between a compulsive obsessive picture and mono-symptomatic psychosis.
Subject(s)
Humans , Male , Adult , Smell , Syndrome , Paranoid Disorders , Schizoid Personality Disorder , Schizophrenia , BullyingABSTRACT
A 34 year old patient who was seen in the Harassment Psychiatry Unit after a series of medical visits to different specialties. The main reason for his harassment, exclusion and derision was due to his body odor. The reports issued by the other specialties ruled out any dermatological pathology, and any of the other conditions proposed by the patient. The psychiatric clinical interview, including the use of other evaluation and diagnostic techniques, suggested a differential diagnosis between a compulsive obsessive picture and mono-symptomatic psychosis.