منابع مشابه
study of hash functions based on chaotic maps
توابع درهم نقش بسیار مهم در سیستم های رمزنگاری و پروتکل های امنیتی دارند. در سیستم های رمزنگاری برای دستیابی به احراز درستی و اصالت داده دو روش مورد استفاده قرار می گیرند که عبارتند از توابع رمزنگاری کلیددار و توابع درهم ساز. توابع درهم ساز، توابعی هستند که هر متن با طول دلخواه را به دنباله ای با طول ثابت تبدیل می کنند. از جمله پرکاربردترین و معروف ترین توابع درهم می توان توابع درهم ساز md4, md...
Experimental Manufacture of Paper for War Maps
Early in World War II, a new map paper was developed that greatly improved the quality and performance of war maps. The National Bureau of Standards cooperated in the development and, subsequently, determined by experimental manufacture how to make the paper from commercially available raw materials. The best results were obtained in experimental manufacture by using fiber furnishes of 100-perc...
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Paper maps and mobile electronic devices have complementary strengths and shortcomings in outdoor use. In many scenarios like small craft sailing or cross-country trekking a complete replacements of maps is neither useful nor desirable. Paper maps are failsafe, relatively cheap, offer superior resolution and provide large scale overview. In uses like open-water sailing it is therefore mandatory...
متن کاملPolystyrene mounting medium.
Polystyrene mounting medium obtainable Ltd, 20 Du The medium described by Kirkpatrick One pounc and Lendrum (1939) and named by them mountant DPX (Distrene plasticised in xylene) was (75°% one replaced by a better formula in 1941. This medium BPS (butyl phthalate plasticised styrene) has given excellent and economical service until recently. The current trouble was not due to the makers of the ...
متن کاملOn topological transitive maps on operator algebras
We consider the transitive linear maps on the operator algebra $B(X)$for a separable Banach space $X$. We show if a bounded linear map is norm transitive on $B(X)$,then it must be hypercyclic with strong operator topology. Also we provide a SOT-transitivelinear map without being hypercyclic in the strong operator topology.
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ژورنال
عنوان ژورنال: School Science and Mathematics
سال: 1909
ISSN: 0036-6803
DOI: 10.1111/j.1949-8594.1909.tb01416.x