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26 papers · 1 filter
Exact Histogram Specification Optimized for Structural Similarity
Alireza Avanaki
An exact histogram specification (EHS) method modifies its input image to have a specified histogram. Applications of EHS include image (contrast) enhancement (e.g., by histogram e…
Cosmological constant influence on cosmic string spacetime
Amir H. Abbassi, Amir M. Abbassi
We investigate the line element of spacetime around a linear cosmic string in the presence of a cosmological constant. We obtain the metric and argue that it should be discarded be…
Energy-momentum Distribution in Static and Non-static Cosmic String Space-times
Amir M. Abbassi, Saeed Mirshekari, Amir H. Abbassi
We elaborate the problem of energy-momentum in general relativity by energy-momentum prescriptions theory. In this regard, we calculate M\oller,Landau-Lifshitz, Papapetrou, Einstei…
Joint Adaptive Modulation-Coding and Cooperative ARQ for Wireless Relay Networks
Morteza Mardani, Jalil S. Harsini, Farshad Lahouti +1
This paper presents a cross-layer approach to jointly design adaptive modulation and coding (AMC) at the physical layer and cooperative truncated automatic repeat request (ARQ) pro…
Geodesic Congruences in the Palatini f(R) Theory
Fatimah Shojai, Ali Shojai
We shall investigate the properties of a congruence of geodesics in the framework of Palatini f(R) theories. We shall evaluate the modified geodesic deviation equation and the Rayc…
On the existence of embeddings into modules of finite homological dimensions
Ryo Takahashi, Siamak Yassemi, Yuji Yoshino
Let R be a commutative Noetherian local ring. We show that R is Gorenstein if and only if every finitely generated R-module can be embedded in a finitely generated R-module of fini…