Fast Hardware Implementations of Static P Systems

In this article we present a simulator of non-deterministic static P systems using Field Programmable Gate Array (FPGA) technology. Its major feature is a high performance, achieving a constant processing time for each transition. Our approach is based on representing all possible applications as words of some regular context-free language. Then, using formal power series it is possible to obtain the number of possibilities and select one of them following a uniform distribution, in a fair and non-deterministic way. According to these ideas, we yield an implementation whose results show an important speed-up, with a strong independence from the size of the P system

Grocio Catolico. Orden europeo y monarquia catolica durante la Guerra de Devolucion, 1667-1668

Centro de Informacion y Documentacion Cientifica (CINDOC). C/Joaquin Costa, 22. 28002 Madrid. SPAIN / CINDOC - Centro de Informaciòn y Documentaciòn CientìficaSIGLEESSpai

Fast Hardware Implementations of Static P Systems

International audienc

Fast Hardware Implementations of Static P Systems

International audienc

Embedded LUKS (E-LUKS): A Hardware Solution to IoT Security

The Internet of Things (IoT) security is one of the most important issues developers have to face. Data tampering must be prevented in IoT devices and some or all of the confidentiality, integrity, and authenticity of sensible data files must be assured in most practical IoT applications, especially when data are stored in removable devices such as microSD cards, which is very common. Software solutions are usually applied, but their effectiveness is limited due to the reduced resources available in IoT systems. This paper introduces a hardware-based security framework for IoT devices (Embedded LUKS) similar to the Linux Unified Key Setup (LUKS) solution used in Linux systems to encrypt data partitions. Embedded LUKS (E-LUKS) extends the LUKS capabilities by adding integrity and authentication methods, in addition to the confidentiality already provided by LUKS. E-LUKS uses state-of-the-art encryption and hash algorithms such as PRESENT and SPONGENT. Both are recognized as adequate solutions for IoT devices being PRESENT incorporated in the ISO/IEC 29192-2:2019 for lightweight block ciphers. E-LUKS has been implemented in modern XC7Z020 FPGA chips, resulting in a smaller hardware footprint compared to previous LUKS hardware implementations, a footprint of about a 10% of these LUKS implementations, making E-LUKS a great alternative to provide Full Disk Encryption (FDE) alongside authentication to a wide range of IoT devices

Patterns of cell proliferation and cell death in the developing retina and optic tectum of the brown trout.

Item does not contain fulltextWe have analyzed the patterns of cell proliferation and cell death in the retina and optic tectum of the brown trout (Salmo trutta fario) throughout embryonic and postembryonic stages. Cell proliferation was detected by immunohistochemistry with an antibody against the proliferating cell nuclear antigen (PCNA), and apoptosis by means of the TUNEL method. Haematoxylin and DAPI staining were also used to demonstrate apoptotic cells. Photoreceptor cell differentiation was assessed by immunohistochemistry with antibodies against opsins. Throughout embryonic development, PCNA-immunoreactive (PCNA-ir) cells become progressively restricted to the peripheral growth zone of the retina, which appears to be the principal source of new retinal cells from late embryos to adults. However, some PCNA-ir cells are observed secondarily in the differentiated retina, first in the inner nuclear layer of 15-mm alevins and later in the outer nuclear layer of 16-mm alevins, after differentiation of the first rods in the central retina, as demonstrated with opsin immunocytochemistry. Our observations also support the view that the PCNA-ir cells observed secondarily in the INL of the central retina of alevins are photoreceptor precursors. The number and distribution of apoptotic cells in the retina and optic tectum of the trout change throughout development, allowing distinction of several waves of apoptosis. Cell death is detected in proliferating areas at early stages, then in postmitotic or differentiating areas, and later concurring temporal and spatially with the establishment of visual circuits, thus indicating a relationship between apoptosis and proliferation, differentiation and synaptogenesis