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排序方式: 共有493条查询结果,搜索用时 9 毫秒
31.
A new hybrid improvement heuristic approach to simple straight and U-type assembly line balancing problems 总被引:4,自引:0,他引:4
This paper presents a new hybrid improvement heuristic approach to simple straight and U-type assembly line balancing problems
which is based on the idea of adaptive learning approach and simulated annealing. The proposed approach uses a weight parameter
to perturb task priorities of a solution to obtain improved solutions. The weight parameters are then modified using a learning
strategy. The maximization of line efficiency (i.e., the minimization of the number of stations) and the equalization of workloads
among stations (i.e., the minimization of the smoothness index or the minimization of the variation of workloads) are considered
as the performance criteria. In order to clarify the proposed solution methodology, a well known problem taken from literature
is solved. A computational study is conducted by solving a large number of benchmark problems available in the literature
to compare the performance of the proposed approach to the existing methods such as simulated annealing and genetic algorithms.
Some test instances taken from literature are also solved by the proposed approach. The results of the computational study
show that the proposed approach performs quite effectively. It also yields optimal solutions for all test problems within
a short computational time. 相似文献
32.
Bilal Alataş Erhan Akin 《Soft Computing - A Fusion of Foundations, Methodologies and Applications》2006,10(3):230-237
In this paper, a genetic algorithm (GA) is proposed as a search strategy for not only positive but also negative quantitative
association rule (AR) mining within databases. Contrary to the methods used as usual, ARs are directly mined without generating
frequent itemsets. The proposed GA performs a database-independent approach that does not rely upon the minimum support and
the minimum confidence thresholds that are hard to determine for each database. Instead of randomly generated initial population,
uniform population that forces the initial population to be not far away from the solutions and distributes it in the feasible
region uniformly is used. An adaptive mutation probability, a new operator called uniform operator that ensures the genetic
diversity, and an efficient adjusted fitness function are used for mining all interesting ARs from the last population in
only single run of GA. The efficiency of the proposed GA is validated upon synthetic and real databases. 相似文献
33.
34.
A comprehensive design and performance evaluation study of counter flow wet cooling towers 总被引:2,自引:0,他引:2
Jameel-Ur-Rehman Khan Bilal Ahmed Qureshi Syed M. Zubair 《International Journal of Refrigeration》2004,27(8):914-923
Fouling of cooling tower fills is one of the most important factors affecting its thermal performance, which reduces cooling tower effectiveness and capability with time. In this paper, the fouling model presented in an earlier paper using the experimental data on fill fouling, is used to investigate the risk based thermal performance of the cooling tower. It is demonstrated that effectiveness of the cooling tower degrades significantly with time indicating that for a low risk level (p=0.01), there is about 6.0% decrease in effectiveness for the given fouling model. The sensitivity analysis of the cooling tower is investigated for both rating and design calculation for different values of mass flow rate ratios. The effect of atmospheric pressure on the thermal performance of the cooling tower is also demonstrated. 相似文献
35.
Hameed Hussain Saif Ur Rehman Malik Abdul Hameed Samee Ullah Khan Gage Bickler Nasro Min-Allah Muhammad Bilal Qureshi Limin Zhang Wang Yongji Nasir Ghani Joanna Kolodziej Albert Y. Zomaya Cheng-Zhong Xu Pavan Balaji Abhinav Vishnu Fredric Pinel Johnatan E. Pecero Dzmitry Kliazovich Pascal Bouvry Hongxiang Li Lizhe Wang Dan Chen Ammar Rayes 《Parallel Computing》2013
An efficient resource allocation is a fundamental requirement in high performance computing (HPC) systems. Many projects are dedicated to large-scale distributed computing systems that have designed and developed resource allocation mechanisms with a variety of architectures and services. In our study, through analysis, a comprehensive survey for describing resource allocation in various HPCs is reported. The aim of the work is to aggregate under a joint framework, the existing solutions for HPC to provide a thorough analysis and characteristics of the resource management and allocation strategies. Resource allocation mechanisms and strategies play a vital role towards the performance improvement of all the HPCs classifications. Therefore, a comprehensive discussion of widely used resource allocation strategies deployed in HPC environment is required, which is one of the motivations of this survey. Moreover, we have classified the HPC systems into three broad categories, namely: (a) cluster, (b) grid, and (c) cloud systems and define the characteristics of each class by extracting sets of common attributes. All of the aforementioned systems are cataloged into pure software and hybrid/hardware solutions. The system classification is used to identify approaches followed by the implementation of existing resource allocation strategies that are widely presented in the literature. 相似文献
36.
Touqeer Haseeb Zaman Shakir Amin Rashid Hussain Mudassar Al-Turjman Fadi Bilal Muhammad 《The Journal of supercomputing》2021,77(12):14053-14089
The Journal of Supercomputing - The Internet of Things is a rapidly evolving technology in which interconnected computing devices and sensors share data over the network to decipher different... 相似文献
37.
38.
Hedgehog Antagonist Pyrimidine–Indole Hybrid Molecule Inhibits Ciliogenesis through Microtubule Destabilisation 下载免费PDF全文
Harleen Khatra Pragya Paramita Khan Sankha Pattanayak Jhuma Bhadra Bilal Rather Saikat Chakrabarti Taniya Saha Prof. Surajit Sinha 《Chembiochem : a European journal of chemical biology》2018,19(7):723-735
One of the crucial regulators of embryonic patterning and tissue development is the Hedgehog‐glioma (Hh‐Gli) signalling pathway; its uncontrolled activation has been implicated in different types of cancer in adult tissues. Primary cilium is one of the important factors required for the activation of Hh signalling, as it brings the critical components together for key protein–protein interactions required for Hh pathway regulation. Most of the synthetic and natural small molecule modulators of the pathway primarily antagonise Smoothened (Smo) or other effectors like Hh ligand or Gli. Here, we report a previously described Hh antagonist, with a pyrimidine–indole hybrid (PIH) core structure, as an inhibitor of ciliogenesis. The compound is unique in its mode of action, as it shows perturbation of microtubule dynamics in both cell‐based assays and in vivo systems (zebrafish embryos). Further studies revealed that the probable targets are α‐tubulin and its acetylated form, found in the cytoplasm and primary cilia. PIH also showed axonal defasiculation in developing zebrafish embryos. We thus propose that PIH antagonises Hh signalling by repressing cilia biogenesis and disassembling α‐tubulin from its stabilised form. 相似文献
39.
Bilal Muhammad Imtiaz Sana Abdul Wadood Ghouzali Sanaa Asif Shahzad 《Multimedia Tools and Applications》2014,72(2):1073-1092
Multimedia Tools and Applications - Conventional steganography focuses on invisibility and undetectability, as the main concern is to make the algorithms immune to steganalysis. Zero-steg-anography... 相似文献
40.
Sardar Muhammad Bilal Atta ur Rehman Khan Samee Ullah Khan Sajjad A. Madani Babar Nazir Mazliza Othman 《Wireless Personal Communications》2014,77(4):2497-2515
Over the last few years, vehicular ad hoc networks (VANETs) have gained popularity for their interesting applications. To make efficient routing decisions, VANET routing protocols require road traffic density information for which they use density estimation schemes. This paper presents a distributed mechanism for road vehicular density estimation that considers multiple road factors, such as road length and junctions. Extensive simulations are carried out to analyze the effectiveness of the proposed technique. Simulation results suggested that, the proposed technique is more accurate compared to the existing technique. Moreover, it facilitate VANET routing protocols to increase packet delivery ratio and reduce end-to-end delay. 相似文献