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21.
Feature selection is one of the most important techniques for data preprocessing in classification problems. In this paper, fuzzy grids–based association rules mining, as an effective data mining technique, is used for feature selection in misuse detection application in computer networks. The main idea of this algorithm is to find the relationships between items in large datasets so that it detects correlations between inputs of the system and then eliminates the redundant inputs. To classify the attacks, a fuzzy ARTMAP neural network is employed whose training parameters are optimized by gravitational search algorithm. The performance of the proposed system is compared with some other machine learning methods in the same application. Experimental results show that the proposed system, when choosing optimum “feature subset size-adjustment” parameter, performs better in terms of detection rate, false alarm rate, and cost per example in classification problems. In addition, employing the reduced-size feature set results in more than 8.4 percent reduction in computational complexity. 相似文献
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M. Rabiee Reza Sadeghi Rad M. Mazinani R. Shafaei 《The International Journal of Advanced Manufacturing Technology》2014,71(5-8):1229-1245
This paper addresses the problem of no-wait two-stage flexible flow shop scheduling problem (NWTSFFSSP) considering unrelated parallel machines, sequence-dependent setup times, probable reworks and different ready times to actualize the problem. The performance measure used in this study is minimizing maximum completion time (makespan). Because of the complexity of addressed problem, we propose a novel intelligent hybrid algorithm [called hybrid algorithm (HA)] based on imperialist competitive algorithm (ICA) which are combined with simulated annealing (SA), variable neighborhood search (VNS) and genetic algorithm (GA) for solving the mentioned problem. The hybridization is carried out to overcome some existing drawbacks of each of these three algorithms and also for increasing the capability of ICA. To achieve reliable results, Taguchi approach is used to define robust parameters' values for our proposed algorithm. A simulation model is developed to study the performance of our proposed algorithm against ICA, SA, VNS, GA and ant colony optimization (ACO). The results of the study reveal the relative superiority of HA studied. In addition, potential areas for further researches are highlighted. 相似文献
25.
A distributed explicit rate allocation algorithm based on the generalised max-min (GMM) fairness principle is proposed for the available bit rate (ABR) ATM services. Compared with a similar algorithm for GMM, it employs fewer fields in an RM cell and imposes lower requirements on the computational capability of the switches 相似文献
26.
S.S. Razavi Tousi R. Yazdani Rad E. Salahi I. Mobasherpour M. Razavi 《Powder Technology》2009,192(3):346-351
High energy ball milling was used to produce a nanostructured Al matrix composite reinforced by submicron α-alumina particles. Scanning electron microscopy analysis as well as tap and green density measurements were used to optimize the milling time needed for the completion of the mechanical milling process. Results show that addition of alumina particles as the reinforcement has a drastic effect on the size, morphology and pressability of the powder. Scanning electron microscopy shows that distribution of alumina particles in the Al matrix reaches a full homogeneity after steady state. This would increase the hardness of powder due to a nano-structured matrix and oxide dispersion strengthening. 相似文献
27.
A time-delay controller is proposed in this letter. This controller possesses attractive properties, such as requiring only one tuning parameter. Furthermore, it can be applied to higher order systems as well as systems with dominant delay. The basic structure is integrated with an online estimation algorithm to form an adaptive time-delay controller. An experimental study is included to demonstrate its performance and merits compared with two similar controllers. 相似文献
28.
Performance Comparison of Automated Vehicle Controllers 总被引:1,自引:0,他引:1
1IntroductionAutomatedhighwaysystems穴AHS雪havedrawnmoreandmoreattentioninrecentyearsbecausefullautomationcangreatlyincreasehighwaycapacitywhileimprovingsafety.IneachplatoonofAHS熏everyvehicle穴excepttheleadingcar雪tightlyfollowstheprecedingvehicle熏andcanreactquicklytotheprecedingcarandemergency.Thedesignofintelligentvehiclecontrolsystemisanim鄄portantpartofAHS熏anditinvolvesautomaticcontrolofthrottleandbrake眼1演.Oneoftheobjectivesofintelligentvehiclecontrolistoachieveautomaticvehic… 相似文献
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G. Ghodrati Amiri A. Abdolahi Rad N. Khanmohamadi Hazaveh 《Computer-Aided Civil and Infrastructure Engineering》2014,29(10):758-770
A method to generate a suite of artificial near‐fault ground motion time histories for specified earthquakes is presented. A wavelet‐based nonstationary (WB‐NS) model has been employed to effectively capture the time‐varying frequency content of a particular acceleration record and continuous wavelet transform has been used to simulate the largest velocity pulse. Furthermore, an iterative procedure using discrete wavelet transform is utilized to modify an earthquake ground motion and generate energy‐compatible ground motion. Eventually, the artificial near‐fault accelerogram is achieved via the superposition of a coherent extracted velocity pulse with a random acceleration record corresponding to a WB‐NS model and multiplied by a time‐modulating envelope function. The effectiveness of the method is demonstrated by comparing the spectral response and Arias intensity curves of the simulated accelerograms with those of the real records. 相似文献
30.
Ali Rahmatmand Mahmood Yaghoubi Ebrahim Goshtasbi Rad Mohammad Mehdi Tavakol 《Building Simulation》2014,7(3):305-319
This paper presents experimental and numerical study of airflow distribution around a reduced-scale model of a common type of domed-roof building. Measurements are performed in an open loop wind tunnel. A new modified Counihan scheme is developed for constructing a part-depth atmospheric boundary layer (ABL). Measured quantities include: wind velocity profile, turbulence intensity and airflow pattern around the building. To conduct the experiments, a 1:54 scale model of a real domed-roof building with six windows and an aperture on the roof is fabricated and placed in the test section of the wind tunnel. In addition, using a numerical modeling, turbulent airflow around such scale model in the wind tunnel is simulated and airflow field inside and outside the model as well as ventilating discharge coefficient are computed. It is illustrated that, airflow around this type of building contains complex adjacent recirculation flows. The building with open apertures has acceptable discharge coefficient for ventilation, which can be a factor to ensure comfort condition for residents as well as complying with energy-saving considerations. 相似文献