A linear code is said to be proper in error detection over a symmetric memoryless channel if its undetected error probability is an increasing function of the channel symbol error probability. A proper code performs well in error detection in the sense that the better the channel, the better the performance, which makes the code appropriate for use in channels where the symbol error probability...

We prove that the D4 root system (equivalently, the set of vertices of the regular 24-cell) is not a universally optimal spherical code. We further conjecture that there is no universally optimal spherical code of 24 points in S, based on numerical computations suggesting that every 5-design consisting of 24 points in S is in a 3-parameter family (which we describe explicitly, based on a constr...

Broadcast systems are a class of networks where one system node (transmitter) simultaneously sends both common and independent information to multiple nodes (receivers) in the system. Compressing the messages transmitted in such systems using traditional (single-transmitter, single-receiver) techniques requires use of a collection of independent source codes, one for each message sent through t...

this paper describes a contra-rotating propeller (crp) system to calculate the hydrodynamic characteristics and then design the optimum operational condition to be installed on two different large bulk carriers and vlcc. the method is based on boundary element method (bem) to obtain the hydrodynamic performance of any complicated configuration such as crp system, and then the optimum propeller ...

In this study we investigate acquisition (code offset and channel state estimation) of multiple direct sequence spread spectrum DSSS signals in a multi-antenna ad hoc network. We derive the form of the optimal acquisition algorithm and show that it is NP-complete. We then derive a tractable suboptimal approach where we use a successive multistage cancellation approach in estimating the initial ...

We prove that the D4 root system (equivalently, the set of vertices of the regular 24-cell) is not a universally optimal spherical code. We further conjecture that there is no universally optimal spherical code of 24 points in S, based on numerical computations suggesting that every 5-design consisting of 24 points in S is in a 3-parameter family (which we describe explicitly, based on a constr...

A new tool for optimal heat transfer design has been constructed by coupling the OPT optimization library to the TACO D nite element heat transfer code The optimization heat transfer code can be used to quickly and e ciently nd optimal operating parameters required for target design criteria This tool has been applied to the heat transfer design of a rotating disk chemical vapor deposition reac...

Maximum distance holey packing MDHP(2, k, v, g) was first introduced by Yin and used to construct an optimal (g+1)-ary constant weight code (v, k, 2k−3) CWC. In this paper, an optimal holey packingOHPd(2, k,v, g) is introduced to construct an optimal (g + 1)-ary constant weight code (v, k, d) CWC. For k = 4, d = 4 and g = 2, it is proved that there exists an OHPd(2, k, v, g) for any integer v ≡...

Duplicated or similar source code, also known as code clones, are possible malicious ‘code smells’ that may need to be removed through refactoring to enhance maintainability. Among many potential refactoring opportunities, the choice and order of a set of refactoring activities may have distinguishable effect on the design/code quality measured in terms of software metrics. Moreover, there may ...