We study the nonlinearity and the weight of the rotation-symmetric (RotS) functions defined by Pieprzyk and Qu [6]. We give exact results for the nonlinearity and weight of 2-degree RotS functions with the help of the semi-bent functions [2] and we give the generating function for the weight of the 3-degree RotS function. Based on the numerical examples and our observations we state a conjectur...

In this paper, we describe our current work on exploring the consistency of read-only transactions (ROT) in real-time systems. A ROT is a transaction that only reads, but does not update any data items. Since there is a significant proportion of ROTs in several real-time systems, it is important to investigate how to process ROTs efficiently with separate algorithms. We identify three different...

A read-only transaction (ROT) does not modify any data. The main issues regarding processing ROTs are correctness, data currency and performance. Two-phase Locking (2PL) protocol is widely used for concurrency control with serializabilty as correctness criteria. Even though 2PL processes ROTs correctly with no data currency related issues, the performance deteriorates as data contention increas...

In this paper, we investigate the approach of using separate algorithms to process read-only transactions in realtime systems. A read-only transaction (ROT) is a transaction that only reads, but does not update any data item. Since there is a significant proportion of ROTs in several real-time systems, it is important to investigate how to process ROTs effectively. Using an algorithm to process...

A read-only transaction (ROT) does not modify any data. Efforts are being made in the literature to improve the performance of ROTs without correctness and data currency issues. The widely used twophase locking protocol (2PL) processes the transactions without any correctness and data currency issues. However, the performance of 2PL deteriorates with data contention. Snapshot isolation (SI)-bas...

In this paper, we describe our current work on exploring the consistency of read-only transactions (ROT) in real-time systems. A ROT is a transaction that only reads, but does not update any data items. Since there is a significant proportion of ROTs in several real-time systems, it is important to investigate how to process ROTs efficiently with separate algorithms. We identify three different...

A read-only transaction (ROT) does not modify any data. The main issues regarding processing ROTs are correctness, data currency and performance. Two-phase Locking (2PL) protocol is widely used for concurrency control with serializabilty as correctness criteria. Even though 2PL processes ROTs correctly with no data currency related issues, the performance deteriorates as data contention increas...

In this paper, we introduce a class of cubic rotation symmetric (RotS) functions and prove that it can yield bent and semi-bent functions. To the best of our knowledge, this is the second primary construction of an infinite class of nonquadratic RotS bent functions which could be found and the first class of nonquadratic RotS semi-bent functions. We also study a class of idempotents (giving Rot...

Recent research shows that the class of Rotation Symmetric Boolean Functions (RSBFs), i.e., the class of Boolean functions that are invariant under circular translation of indices, are potentially rich in functions of cryptographic significance. Here we present new results regarding the Rotation Symmetric (rots) correlation immune (CI) and bent functions. We present important data structures fo...

Cassava root rots are important diseases in different agroecological zones of West Africa. The causing pathogens were collected from 101 farmers’ fields in forest mosaic savanna, southern guinea savanna, northern guinea savanna and sudan savanna of Benin were isolated, identified and analyzed for their virulence. A total of 51 isolates were found showing different disease reaction with 13.7% hi...