lý luận thuần tuý của f quesney

... suitable for genetic operators The method of representation has a major impact on the performance of the GA Different representation schemes might cause different performances in terms of accuracy ... regardless of the position of the object Thus, a simplified fuzzy model of the sensor consists of rules such as “If (T–Tref ) is small Then (γ –γref ) is small” where Tref is the value of T when ... Schaffer J D., Caruana R A., Eshelman L J and Das R., (1989), A study of control parameters affecting on-line performance of genetic algorithms for function optimisation, Proc Third Int Conf on...

Ngày tải lên: 25/01/2014, 13:20

... FIGURE 3.7 (a) Shannon’s function (M = 2) (b) Amplitude of the gradient for Shannon’s function (M = 2) It is easy to prove that Sµ is a measure of fuzziness, according to requirements f a), f ... and it is often referred to as the membership matrix of the fuzzy relation ᏾k Equation 3.6 is very similar to the resolution form of ᏾k, as defined in (Klir and Folger 1988) Indeed, if we consider ... Actually, H ,4 are the matrix forms of characteristic functions χ ,4 The matrix form of the membership function defining the fuzzy relation ᏾ is then ©2001 CRC Press LLC def { ᏹ = max• α m H m m∈ ,4...

Ngày tải lên: 17/10/2013, 11:15

... if the shop-load levels are very low Scheduling in FMSs is different from scheduling in job shops or transfer lines In FMSs, utilization level of each machine can be different For example, if ... randomness of information in the knowledge base, fuzzy logic furnishes a systematic basis for the computation of certainty factors in the form of fuzzy numbers At this juncture, fuzzy logic provides ... of a Routing Parts Select AGVs Part Selection from Input Buffers Part Selection from Output Buffers Intersections Select AGVs AGVs Select Parts The rules of each decision point can have different...

Ngày tải lên: 19/10/2013, 18:15

... determination of a set of features required The number of neurons in input layer corresponds to n, the total number of features derived for parts from a CAD system The inputs are in the form of a binary ... number of neurons in the first hidden layer (feature family level) equals the number of feature families Features of all existing parts are collected and a feature–part incidence matrix is formed ... activation function f ′ι(netpi) The output value of the activation function becomes the input for a neuron in the next layer For more details on the basic operation of three-layer feedforward networks...

Ngày tải lên: 19/10/2013, 18:15

... manufacturing and design engineers Using proper classification schemes, part features can represent form features, tolerance features, assembly features, functional features, or material features ... with necessary form features from the feature library ψ v Based on either indexing scheme, design case dk can be represented into a vector format d k in terms of form features from ψ Accordingly, ... not only feature-appearing frequency but also associative feature information Specifically, proposed fuzzy feature association procedure, FFA, can be defined as [ ] v v FFA a , R → a new Equation...

Ngày tải lên: 23/10/2013, 16:15

... in different cells Since the fitness function in a genetic algorithm is a measure of goodness of the solution to the objective function, the following fitness function, which is an inverse of the ... (number of parts), stop, otherwise go to step With this procedure, for example if the value of the first gene in Figure 6.5 is and there are only three different alternative routings for part ... regard to different aspects of cellular manufacturing systems can be found in Wemmerlov and Hyer [1987] Kusiak and Cheng [1991] have also reviewed some applications of models and algorithms for the...

Ngày tải lên: 23/10/2013, 16:15

... after F3 , otherwise the drill (T14) would not be able to reach the bottom of F5 On the other hand, F5 should also be produced after F1 as F1 is the datum feature of F5 F7 should be produced after ... PRs — Firstly, the PRs between features are identified F1 should be produced after F2 and F8 for better machining efficiency F4 should be produced after F3 due to parent–child relationship F5 should ... less preferred For example, for the part in Figure 9.3, the PR of F2 → F9 is a hard one, while the PR of F4 → F1 0 is a soft one By categorizing the PRs into hard and soft ones, a feasible process...

Ngày tải lên: 27/10/2013, 23:15

... Thus, for a feasible schedule, the following conditions are required: k kЈ k kЈ kЈЈ k kЈЈ k 1 ␦(s Ϫ f ) ϭ  0 if s ijl Ϫ f ijЈl Ն 0, 1 kЈЈ k ␦ ( s ijЈl Ϫ f ijl ) ϭ  0 if s ijЈl Ϫ f ijl Ն ... For example, let 1–3–2–6–4–7–8–5 be a feasible solution of a sequence of eight operations required for the completion of a workpiece Then x 261 indicates that the fourth time slot (or the fourth ... starting time of operation j performed by MUi on WLl in the kth time slot Define s ijl ϭ , if k k k ϭ 1; s ijl ϭ ϩϱ for infeasible i, j, k, l ; and s k ϭϩϱ if Σ x ijl ϭ for all j, k, l , i.e., for any...

Ngày tải lên: 27/10/2013, 23:15

... characteristics Therefore, performance of the controller significantly affects the overall performance of the control system for the manufacturing process Equally important is the performance of the actuator ... help of the three colors of lamp with different incident angles, we can acquire color patterns of three different slope surfaces in an image at a time Figure 12.6(a) shows a typical image of solder ... of metal along the edge by making the best use of the skin effect and proximity effects of high-frequency currents When the molten metal from both adjacent edges runs together by the action of...

Ngày tải lên: 06/11/2013, 09:15

... affects the efficiency and profitability of these manufacturing firms The primary causal factor for cast fractures and/or deformities is the distribution of moisture content inside the cast before ... type For the experiments carried out by Tekie et al., there were a total of four different combinations of gas and reactor Therefore, the authors developed four different quadratic response surface ... of an engine manifold • Media flow rate through the manifold • Number of cycles of the AFM machine piston Media conditions: • Temperature of the media • Temperature of the manifold • Number of...

Ngày tải lên: 06/11/2013, 09:15

... structure of a set of tasks, reflecting precedence constraints among them, can be defined in different ways In addition, different criteria that measure the quality of the performance of a schedule ... sublist1 from parent p2 and slide holes to cross section (iii) Insert sublist1 into the holes of parent p2 to form the offspring o1 and insert sublist2 into the holes of parent p1 to form the offspring ... bottleneck machines Different measures of bottleneck quality of machines will yield different sequences of bottleneck machines The quality of the schedules obtained by the shifting bottleneck heuristic...

Ngày tải lên: 06/11/2013, 09:15

... 41: 42: 43: 44: 45: 46: 47: 48: 49: 50: 51: 52: 53: 54: IF( IF( IF( IF( IF( IF( IF( IF( IF( IF( IF( IF( IF( IF( IF( IF( IF( IF( IF( IF( A3=1)&( A6=1) THEN Machine State=1 A6=1) THEN Machine State=1 ... IF( A2=1)&( A4=2)&( A5=1)&( A6=3) THEN Machine State=4 (2/2=100%) Possible rules for concept ë4í: 13: 14: 15: 16: 17: 18: 19: 20: 21: 22: 23: 24: 25: IF( IF( IF( IF( IF( IF( IF( IF( IF( IF( IF( ... (1/1=100%) (1/1=100%) (1/1=100%) Possible rules for concept ë1í: 25: 26: 27: 28: 29: 30: 31: 32: 33: 34: IF( IF( IF( IF( IF( IF( IF( IF( IF( IF( A1=1)&( A3=2)&( A0=1)&( A1=1)&( A4=1)&( A0=1)&(...

Ngày tải lên: 13/12/2013, 01:15

... α-cut of a fuzzy set F as an interval of confidence (IC) F = [f1 (α), f2 (α)] Equation (18.11) which is a monotonic decreasing function of α, that is, (α′ >α) ⇒ (F ′ ⊂ F ) Equation (18.12) where for ... are as follows: ©2001 CRC Press LLC Shift Fuzzy Magnitude Classifier Cutoff value(s) Mean Shift Mean/ Variance Shift M-NN Sample Observations Variance Shift Individual Observations Cutoff value(s) ... variance shifts simultaneously One of the major components of the proposed system is composed of several feedforward neural networks that are trained off-line via simulation data Fuzzy sets are...

Ngày tải lên: 13/12/2013, 01:15

... Comparison of Performance of IQCs and SPD For the different simulations, the iterative inversion for the IQC, referred to from now on as IQCII, is performed using an iterative inversion rate of 0.05 ... recommend feedforward neural networks (FFNs) for modeling the quality response characteristics Some of the reasons for making this recommendation are as follows: Universal Approximation FFNs can ... vector y is a function of x1 through xN, and hence can be written (for time-invariant systems) as () y =f x Equation (17.7) Here, f( x) = (f1 (x), …, fM(x))T denotes a column vector of functions,...

Ngày tải lên: 13/12/2013, 01:15

... Machining Parameters Proximity Sensor Fuzzifier Deffuzzifier Ra Spindle Speed Feed Rate Fuzzy Inference Engine Depth of Cut ISRR-FN FIGURE 16.8 Structure of the ISRR-FN Each domain interval was divided ... common fuzzy rule base After input vectors were fuzzified by the fuzzification interface, the fuzzy inference engine generated output values by inferencing these fuzzified input values based on the fuzzy ... of the surface finish, or surface roughness, affects several functional attributes of parts, such as surface friction, wear, reflectivity, heat transmission, porosity, coating adherence, and fatigue...

Ngày tải lên: 13/12/2013, 01:15

... WS WF WS WF WS WF WS WF WS WF WS WF A B C D E AA AB BA BB BA AB BC CB CC CB BC CD DC DD DC CD DE ED EE ED DE EF FE FF FE EF Then wear states A B C D E F where µι (w)(i = A, B, …, F) is the fuzzy ... membership of spindle current Fuzzy value of tool wears Real cutting current design Fusion with fuzzy inference Defuzzification of tool wears Calculating the membership of feed current Fuzzy rules ... 0.14 -feature f1 ; o -feature f2 ; x -feature f3 ; * -feature f4 ; Features value 0.12 0.1 0.08 0.06 0.04 0.02 0 0.1 0.2 0.3 0.4 0.5 Tool flank wear (mm) FIGURE 15.31 The relationship between features...

Ngày tải lên: 13/12/2013, 01:15

... Definition of Attributes Attribute Definition The mean of the resultant force F = Crest factor of the feed force CF = Fx + Fy + Fz ( ) ( ) max F z – F z Fz F The ratio of the cutting forces RF = z = Fr ... = z = Fr 10 11 Fz 2 Fx + Fy The mean crossing rate of the feed force Fz The energy of the feed force Fz in the frequency band [64–128] Hz The energy of the feed force Fz in the frequency band ... most effective one This is due to the fact that all the force and vibration information have been mixed up (so we cannot differentiate the directional forces and vibrations, the effect of plowing,...

Ngày tải lên: 13/12/2013, 01:15

... diagnosis, the frame of discernment is the union of all possible fault hypotheses Each piece of collected evidence can be mapped to a fault or group of faults within Θ The likelihood of a fault proposition ... number of efforts to obtain the optimal network structure have been described [Kim and May, 1994] Other efforts have focused on the effect of variations in learning parameters on network performance ... gas flows P weight Butterfly valve position Modular Neural Network B weight thickness hot muffle muffle temperatures FIGURE 13.12 (a) Block diagram of a modular neural network (b) Schematic of...

Ngày tải lên: 13/12/2013, 01:16

... the state of control of the process The performance of the neural network was fair, with a prediction rate of approximately 70% The sensitivity of the performance was investigated for various ... of manufacturing systems to the control of manufacturing processes One top-down classification of neural network applications to intelligent manufacturing, as shown in Figure 2.1, results in four ... modeling and design of manufacturing systems, including machine-cell and part-family formation for cellular manufacturing systems; (2) modeling, planning, and scheduling of manufacturing processes;...

Ngày tải lên: 25/01/2014, 13:20