Evaluation From User Evaluation distance(s, t) ,(S1-t,)(1) Evaluation phase where distance(s, t)is the Euclidean distance between two nteractive G Phase items. The variable n is the number of music features and m Selection indicates the length of each property Truncation Selection Note that before calculating distance between two items, the values of music features are normalized to the range of o and l IV. THE EXPERIMENT Probability P In this section, we describe the implementation of our P<05 proposed system and experiment results. A total of 200 MP3 music files were used for this experiment and the properties of each file were acquired by CLAM in Feature extraction ection Ill. A) Crossover A. Implementation BLX-O crossover We incorporate with this system, which is implemented Java Servlet Page(JSP), the information gathered in the ent to make it convenient for the user evaluation. As shown in Fig. 4, the website provides essential information such as artist name Figure 2. The process of Interactive GA phase and song title: users can rate their preferences about each music item by clicking the corresponding icon. The rating is represented by a scale from 0 to 100. Each time a user BLX-a Crossover evaluates a page of 10 items. The initial page is randomly Select two items Xr and Y(t) cording to the uniform distribution. The 2. Create two offsprings X(t+1)and Y(t+1)as follows: successive page is constructed based on the user evaluation of the preceding one. In order to help users'evaluation, we For i= 1 to n(ength of chromosome)do provide a function that users can listen to the music tracks (1)Calculate Distance between X(o and Y( which they are not familiar with. Di=l X(o-Y(t) B. Experiment results (2)Choose an uniform random real number u from interval <mn(X(n,Y()-(a·D),max(x(n,Y(t)+(a·D)> To assess the performance of our proposed system, we performed experiments on the built website, 10 users were asked to evaluate 7 pages(a total of 70 items per each user) (3)Repeat step(2)as same as X(t+1) he evaluation results were automatically collected in our system's database. We measured the average score of rating for each page. However, we excluded two malevolence users Figure 3. The operation of BLX-a Crossover (in evaluating scores) by inspecting the scores of successive 2)Crossover: In the crossover step, the system executes Artst Name Rating BLX-a Crossover [12], because the music features are My love (Feat. NC Mong) ★★★★★ represented as real numbers in this system. Fig. 3 shows 3 KMiI how to apply BLX-a Crossover on the selected individuals. s Samey alate similarity 78 Super unior Somy Soy between music features of selected items resulted from the ★女女女安 previous operations and all the remaining items in the 6 4Nna ★★★安安 system storage. Each individual has its own unique 9 After chod 安女女女女 properties extracted by CLAM(descried in Feature 13 Dmamk uo ★★★★女 Extraction Phase). This system, thus, calculates the SG Wannabe 女女女女卖 similarity by checking the distance of the properties of each ★★女女 Figure 4. The experiment website V6-416 10 2nd International Conference on Computer Engineering and Technology TVolume 6]:?3 5( -5 :C3 5 #MO$- +'    )( -5 8 #MO $- @>?A <     5     <    3 :3 C . .55#MO$-  -3 ,' #" ) 5   <.         5- 5               3 !  -   .  9 55 8 < $# *       &# +3        <&  55  *.  9 *>++3   *+      - - -      > ? > * + >   .  *+   !   <. .  3 -<  <     553 6<  <. .  -   = /  >3 (D3 !!ML!(!6 (    . <   5     55  85  3?//LC .85   55  .9<$#     &# *<  (((3+3  "%    % 5 .   . 5    "- - L *" L+     5- 5 *     &# +3% <  .< 5-   85    -    &   -     - 3  .  :3 0 .< 5-               G     5  <   <& 5   3   5  <    /  >//3 !     -  5  >/  3    5             < 3  -5 <   - 5  3 ( 5;- . 5-         & .  .3  %       5     55   . 5  85     < .<G >/  . &-25*2/ 5+3  -  .       ;<3% -  53.-.8. -  * - +< 5 - 53 :03 85  .< V6-416 2010 2nd International Conference on Computer Engineering and Technology [Volume 6]