Bu çalışmada, Türkiye'nin kuzey batısında Zonguldak'ta (41ºK-31ºD) yer alan ve su toplama alanı yaklaşık 12 km2 olan ormanlık bir dağ akarsuyu (Harmankaya) dalma havuzlarıyla ilişkili olarak incelenmiştir. Akarsuda 22 havuzu tespit edilmiş olup, havuzlarının düşüm yükseklikleri 0.7-20 m, ortalama havuz derinlikleri ise 0.53-1.59 m arasında değişmektedir. Seçilen havuzda, derinliği boyunca çözün...

The rise of smart applications has drawn interest to logical reasoning over data streams. Recently, different query languages and stream processing/reasoning engines were proposed in different communities. However, due to a lack of theoretical foundations, the expressivity and semantics of these diverse approaches were given only informally. Towards clear specifications and means for analytic s...

It is necessary that the linear complexity of a key stream sequence in a stream cipher system is not less than half of a period. This paper puts forward the linear complexity of a class of binary interleaved sequences with period 4N over the finite field with characteristic 2. Results show that the linear complexity of some of these sequences satisfies the requirements of cryptography.

In this paper we investigate univariate algebraic attacks on filter generators over extension fields Fq = F2n with focus on the WelchGong (WG) family of stream ciphers. Our main contribution is to break WG-5, WG-7, WG-8 and WG-16 by combining results on the so-called spectral immunity (minimum distance of certain cyclic codes) with properties of the WG type stream cipher construction. The spect...

to the user's queries should be time and space efficient. In this paper, we consider the special requirements of indexing to determine the performance of different techniques in data stream processing environments. Stream indexing has main differences with approaches in traditional databases. Also, we compare data stream indexing models analytically that can provide a suitable method for stream...

The aim of this short paper is to explore a new connection between a conjecture concerning sharp boundary observability estimates for the 1-D heat equation in small time and a conjecture concerning the cost of null-controllability for a 1-D convection-diffusion equation with constant coefficients controlled on the boundary in the vanishing viscosity limit, in the spirit of what is done in [Pier...