Minimum Information about T Regulatory Cells: A Step toward Reproducibility and Standardization

Nephrolog

Efecto de Tres Dosis de N,P Y K En la Produccion de Maracuya Amarillo (Passiflora Edulis Sims F. Flavicarpa Deg).

El objetivo de este trabajo fue evaluar el efecto de tres dosis de nitrógeno, fósforo y potasio durante tres años de producción del maracuyá amarillo. El experimento fue conducido en el municipio de Guaíba, Rio Grande del Sur, Brasil, en un suelo de la unidad de mapeamiento São Jerônimo (Laterítico Bruno Rojizo distrófico). El rendimiento médio anual osciló entre 13,7 y 16,7 t/ha en función de los tratamientos. El análisis estadístico no acusó diferencia entre las producciones de los diferentes tratamientos. Los tenores de macronutrientes en las hojas, mostraron valores considerados normales para el cultivo.Made available in DSpace on 2011-04-09T12:18:31Z (GMT). No. of bitstreams: 1 pab03mar91.pdf: 241422 bytes, checksum: 479b54144c239e206e19c9b9d8a03273 (MD5) Previous issue date: 2001-09-17199

Towards Formally Verified Compilation of Tag-Based Policy Enforcement

Hardware-assisted reference monitoring is receiving increasing attention as a way to improve the security of existing software. One example is the PIPE architecture extension, which attaches metadata tags to register and memory values and executes tag-based rules at each machine instruction to enforce a software-defined security policy. To use PIPE effectively, engineers should be able to write security policies in terms of source-level concepts like functions, local variables, and structured control operators, which are not visible at machine level. It is the job of the compiler to generate PIPE-aware machine code that enforces these source-level policies. The compiler thus becomes part of the monitored system’s trusted computing base---and hence a prime candidate for verification. To formalize compiler correctness in this setting, we extend the source language semantics with its own form of user-specified tag-based monitoring, and show that the compiler preserves that monitoring behavior. The challenges of compilation include mapping source-level monitoring policies to instruction-level tag rules, preserving fail-stop behaviors, and satisfying the surprisingly complex preconditions for conventional optimizations. In this paper, we describe the design and verification of Tagine, a small prototype compiler that translates a simple tagged WHILE language to a tagged register transfer language and performs simple optimizations. Tagine is based on the RTLgen and Deadcode phases of the CompCert compiler, and hence is written and verified in Coq. This work is a first step toward verification of a full-scale compiler for a realistic tagged source language