Document (#35961)

Author

Naderi, H.
Rumpler, B.

Title

PERCIRS: a system to combine personalized and collaborative information retrieval

Source

Journal of documentation. 66(2010) no.4, S.532-562

Year

2010

Abstract

Purpose - This paper aims to discuss and test the claim that utilization of the personalization techniques can be valuable to improve the efficiency of collaborative information retrieval (CIR) systems. Design/methodology/approach - A new personalized CIR system, called PERCIRS, is presented based on the user profile similarity calculation (UPSC) formulas. To this aim, the paper proposes several UPSC formulas as well as two techniques to evaluate them. As the proposed CIR system is personalized, it could not be evaluated by Cranfield, like evaluation techniques (e.g. TREC). Hence, this paper proposes a new user-centric mechanism, which enables PERCIRS to be evaluated. This mechanism is generic and can be used to evaluate any other personalized IR system. Findings - The results show that among the proposed UPSC formulas in this paper, the (query-document)-graph based formula is the most effective. After integrating this formula into PERCIRS and comparing it with nine other IR systems, it is concluded that the results of the system are better than the other IR systems. In addition, the paper shows that the complexity of the system is less that the complexity of the other CIR systems. Research limitations/implications - This system asks the users to explicitly rank the returned documents, while explicit ranking is still not widespread enough. However it believes that the users should actively participate in the IR process in order to aptly satisfy their needs to information. Originality/value - The value of this paper lies in combining collaborative and personalized IR, as well as introducing a mechanism which enables the personalized IR system to be evaluated. The proposed evaluation mechanism is very valuable for developers of personalized IR systems. The paper also introduces some significant user profile similarity calculation formulas, and two techniques to evaluate them. These formulas can also be used to find the user's community in the social networks.

Theme

Social tagging
Retrievalstudien

Object

PERCIRS

Similar documents (content)

1. Zhou, D.; Lawless, S.; Wu, X.; Zhao, W.; Liu, J.: ¬A study of user profile representation for personalized cross-language information retrieval (2016) 0.39

   0.39286628 = sum of:
     0.39286628 = product of:
       0.9821657 = sum of:
         0.024950985 = weight(abstract_txt:evaluation in 4167) [ClassicSimilarity], result of:
           0.024950985 = score(doc=4167,freq=2.0), product of:
             0.06301593 = queryWeight, product of:
               4.479632 = idf(docFreq=1368, maxDocs=44421)
               0.014067211 = queryNorm
             0.39594725 = fieldWeight in 4167, product of:
               1.4142135 = tf(freq=2.0), with freq of:
                 2.0 = termFreq=2.0
               4.479632 = idf(docFreq=1368, maxDocs=44421)
               0.0625 = fieldNorm(doc=4167)
         0.029239552 = weight(abstract_txt:proposes in 4167) [ClassicSimilarity], result of:
           0.029239552 = score(doc=4167,freq=1.0), product of:
             0.0882502 = queryWeight, product of:
               1.183403 = boost
               5.30121 = idf(docFreq=601, maxDocs=44421)
               0.014067211 = queryNorm
             0.33132562 = fieldWeight in 4167, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               5.30121 = idf(docFreq=601, maxDocs=44421)
               0.0625 = fieldNorm(doc=4167)
         0.038845148 = weight(abstract_txt:user in 4167) [ClassicSimilarity], result of:
           0.038845148 = score(doc=4167,freq=7.0), product of:
             0.0638201 = queryWeight, product of:
               1.2325349 = boost
               3.6808684 = idf(docFreq=3042, maxDocs=44421)
               0.014067211 = queryNorm
             0.60866636 = fieldWeight in 4167, product of:
               2.6457512 = tf(freq=7.0), with freq of:
                 7.0 = termFreq=7.0
               3.6808684 = idf(docFreq=3042, maxDocs=44421)
               0.0625 = fieldNorm(doc=4167)
         0.10878157 = weight(abstract_txt:profile in 4167) [ClassicSimilarity], result of:
           0.10878157 = score(doc=4167,freq=4.0), product of:
             0.13348079 = queryWeight, product of:
               1.4554062 = boost
               6.519684 = idf(docFreq=177, maxDocs=44421)
               0.014067211 = queryNorm
             0.8149605 = fieldWeight in 4167, product of:
               2.0 = tf(freq=4.0), with freq of:
                 4.0 = termFreq=4.0
               6.519684 = idf(docFreq=177, maxDocs=44421)
               0.0625 = fieldNorm(doc=4167)
         0.011013864 = weight(abstract_txt:that in 4167) [ClassicSimilarity], result of:
           0.011013864 = score(doc=4167,freq=2.0), product of:
             0.052689664 = queryWeight, product of:
               1.5837921 = boost
               2.3649352 = idf(docFreq=11344, maxDocs=44421)
               0.014067211 = queryNorm
             0.20903271 = fieldWeight in 4167, product of:
               1.4142135 = tf(freq=2.0), with freq of:
                 2.0 = termFreq=2.0
               2.3649352 = idf(docFreq=11344, maxDocs=44421)
               0.0625 = fieldNorm(doc=4167)
         0.027543092 = weight(abstract_txt:systems in 4167) [ClassicSimilarity], result of:
           0.027543092 = score(doc=4167,freq=2.0), product of:
             0.09135108 = queryWeight, product of:
               1.903714 = boost
               3.411175 = idf(docFreq=3984, maxDocs=44421)
               0.014067211 = queryNorm
             0.30150813 = fieldWeight in 4167, product of:
               1.4142135 = tf(freq=2.0), with freq of:
                 2.0 = termFreq=2.0
               3.411175 = idf(docFreq=3984, maxDocs=44421)
               0.0625 = fieldNorm(doc=4167)
         0.06329068 = weight(abstract_txt:techniques in 4167) [ClassicSimilarity], result of:
           0.06329068 = score(doc=4167,freq=3.0), product of:
             0.12900245 = queryWeight, product of:
               2.023433 = boost
               4.5321174 = idf(docFreq=1298, maxDocs=44421)
               0.014067211 = queryNorm
             0.49061608 = fieldWeight in 4167, product of:
               1.7320508 = tf(freq=3.0), with freq of:
                 3.0 = termFreq=3.0
               4.5321174 = idf(docFreq=1298, maxDocs=44421)
               0.0625 = fieldNorm(doc=4167)
         0.015468017 = weight(abstract_txt:this in 4167) [ClassicSimilarity], result of:
           0.015468017 = score(doc=4167,freq=2.0), product of:
             0.072728 = queryWeight, product of:
               2.1486003 = boost
               2.4062347 = idf(docFreq=10885, maxDocs=44421)
               0.014067211 = queryNorm
             0.21268311 = fieldWeight in 4167, product of:
               1.4142135 = tf(freq=2.0), with freq of:
                 2.0 = termFreq=2.0
               2.4062347 = idf(docFreq=10885, maxDocs=44421)
               0.0625 = fieldNorm(doc=4167)
         0.040296122 = weight(abstract_txt:paper in 4167) [ClassicSimilarity], result of:
           0.040296122 = score(doc=4167,freq=2.0), product of:
             0.1317013 = queryWeight, product of:
               2.7046053 = boost
               3.4616103 = idf(docFreq=3788, maxDocs=44421)
               0.014067211 = queryNorm
             0.30596602 = fieldWeight in 4167, product of:
               1.4142135 = tf(freq=2.0), with freq of:
                 2.0 = termFreq=2.0
               3.4616103 = idf(docFreq=3788, maxDocs=44421)
               0.0625 = fieldNorm(doc=4167)
         0.62273663 = weight(abstract_txt:personalized in 4167) [ClassicSimilarity], result of:
           0.62273663 = score(doc=4167,freq=6.0), product of:
             0.56655717 = queryWeight, product of:
               5.609585 = boost
               7.179679 = idf(docFreq=91, maxDocs=44421)
               0.014067211 = queryNorm
             1.0991594 = fieldWeight in 4167, product of:
               2.4494898 = tf(freq=6.0), with freq of:
                 6.0 = termFreq=6.0
               7.179679 = idf(docFreq=91, maxDocs=44421)
               0.0625 = fieldNorm(doc=4167)
       0.4 = coord(10/25)
   

2. Ahn, J.-w.; Brusilovsky, P.: Adaptive visualization for exploratory information retrieval (2013) 0.35

   0.352826 = sum of:
     0.352826 = product of:
       0.80187726 = sum of:
         0.025584608 = weight(abstract_txt:proposes in 3717) [ClassicSimilarity], result of:
           0.025584608 = score(doc=3717,freq=1.0), product of:
             0.0882502 = queryWeight, product of:
               1.183403 = boost
               5.30121 = idf(docFreq=601, maxDocs=44421)
               0.014067211 = queryNorm
             0.28990993 = fieldWeight in 3717, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               5.30121 = idf(docFreq=601, maxDocs=44421)
               0.0546875 = fieldNorm(doc=3717)
         0.018168155 = weight(abstract_txt:user in 3717) [ClassicSimilarity], result of:
           0.018168155 = score(doc=3717,freq=2.0), product of:
             0.0638201 = queryWeight, product of:
               1.2325349 = boost
               3.6808684 = idf(docFreq=3042, maxDocs=44421)
               0.014067211 = queryNorm
             0.28467762 = fieldWeight in 3717, product of:
               1.4142135 = tf(freq=2.0), with freq of:
                 2.0 = termFreq=2.0
               3.6808684 = idf(docFreq=3042, maxDocs=44421)
               0.0546875 = fieldNorm(doc=3717)
         0.035367455 = weight(abstract_txt:complexity in 3717) [ClassicSimilarity], result of:
           0.035367455 = score(doc=3717,freq=1.0), product of:
             0.109513015 = queryWeight, product of:
               1.3182801 = boost
               5.90541 = idf(docFreq=328, maxDocs=44421)
               0.014067211 = queryNorm
             0.3229521 = fieldWeight in 3717, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               5.90541 = idf(docFreq=328, maxDocs=44421)
               0.0546875 = fieldNorm(doc=3717)
         0.014962498 = weight(abstract_txt:other in 3717) [ClassicSimilarity], result of:
           0.014962498 = score(doc=3717,freq=1.0), product of:
             0.07775755 = queryWeight, product of:
               1.5709455 = boost
               3.5186288 = idf(docFreq=3578, maxDocs=44421)
               0.014067211 = queryNorm
             0.19242501 = fieldWeight in 3717, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               3.5186288 = idf(docFreq=3578, maxDocs=44421)
               0.0546875 = fieldNorm(doc=3717)
         0.016692001 = weight(abstract_txt:that in 3717) [ClassicSimilarity], result of:
           0.016692001 = score(doc=3717,freq=6.0), product of:
             0.052689664 = queryWeight, product of:
               1.5837921 = boost
               2.3649352 = idf(docFreq=11344, maxDocs=44421)
               0.014067211 = queryNorm
             0.3167984 = fieldWeight in 3717, product of:
               2.4494898 = tf(freq=6.0), with freq of:
                 6.0 = termFreq=6.0
               2.3649352 = idf(docFreq=11344, maxDocs=44421)
               0.0546875 = fieldNorm(doc=3717)
         0.034082837 = weight(abstract_txt:systems in 3717) [ClassicSimilarity], result of:
           0.034082837 = score(doc=3717,freq=4.0), product of:
             0.09135108 = queryWeight, product of:
               1.903714 = boost
               3.411175 = idf(docFreq=3984, maxDocs=44421)
               0.014067211 = queryNorm
             0.37309727 = fieldWeight in 3717, product of:
               2.0 = tf(freq=4.0), with freq of:
                 4.0 = termFreq=4.0
               3.411175 = idf(docFreq=3984, maxDocs=44421)
               0.0546875 = fieldNorm(doc=3717)
         0.03197328 = weight(abstract_txt:techniques in 3717) [ClassicSimilarity], result of:
           0.03197328 = score(doc=3717,freq=1.0), product of:
             0.12900245 = queryWeight, product of:
               2.023433 = boost
               4.5321174 = idf(docFreq=1298, maxDocs=44421)
               0.014067211 = queryNorm
             0.24785016 = fieldWeight in 3717, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               4.5321174 = idf(docFreq=1298, maxDocs=44421)
               0.0546875 = fieldNorm(doc=3717)
         0.009570347 = weight(abstract_txt:this in 3717) [ClassicSimilarity], result of:
           0.009570347 = score(doc=3717,freq=1.0), product of:
             0.072728 = queryWeight, product of:
               2.1486003 = boost
               2.4062347 = idf(docFreq=10885, maxDocs=44421)
               0.014067211 = queryNorm
             0.13159096 = fieldWeight in 3717, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               2.4062347 = idf(docFreq=10885, maxDocs=44421)
               0.0546875 = fieldNorm(doc=3717)
         0.024931954 = weight(abstract_txt:paper in 3717) [ClassicSimilarity], result of:
           0.024931954 = score(doc=3717,freq=1.0), product of:
             0.1317013 = queryWeight, product of:
               2.7046053 = boost
               3.4616103 = idf(docFreq=3788, maxDocs=44421)
               0.014067211 = queryNorm
             0.18930681 = fieldWeight in 3717, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               3.4616103 = idf(docFreq=3788, maxDocs=44421)
               0.0546875 = fieldNorm(doc=3717)
         0.045649547 = weight(abstract_txt:system in 3717) [ClassicSimilarity], result of:
           0.045649547 = score(doc=3717,freq=3.0), product of:
             0.14288953 = queryWeight, product of:
               3.0116537 = boost
               3.372775 = idf(docFreq=4140, maxDocs=44421)
               0.014067211 = queryNorm
             0.3194744 = fieldWeight in 3717, product of:
               1.7320508 = tf(freq=3.0), with freq of:
                 3.0 = termFreq=3.0
               3.372775 = idf(docFreq=4140, maxDocs=44421)
               0.0546875 = fieldNorm(doc=3717)
         0.5448946 = weight(abstract_txt:personalized in 3717) [ClassicSimilarity], result of:
           0.5448946 = score(doc=3717,freq=6.0), product of:
             0.56655717 = queryWeight, product of:
               5.609585 = boost
               7.179679 = idf(docFreq=91, maxDocs=44421)
               0.014067211 = queryNorm
             0.96176445 = fieldWeight in 3717, product of:
               2.4494898 = tf(freq=6.0), with freq of:
                 6.0 = termFreq=6.0
               7.179679 = idf(docFreq=91, maxDocs=44421)
               0.0546875 = fieldNorm(doc=3717)
       0.44 = coord(11/25)
   

3. Xie, H.; Li, X.; Wang, T.; Lau, R.Y.K.; Wong, T.-L.; Chen, L.; Wang, F.L.; Li, Q.: Incorporating sentiment into tag-based user profiles and resource profiles for personalized search in folksonomy (2016) 0.35

   0.34693512 = sum of:
     0.34693512 = product of:
       0.8673378 = sum of:
         0.028726377 = weight(abstract_txt:user in 3671) [ClassicSimilarity], result of:
           0.028726377 = score(doc=3671,freq=5.0), product of:
             0.0638201 = queryWeight, product of:
               1.2325349 = boost
               3.6808684 = idf(docFreq=3042, maxDocs=44421)
               0.014067211 = queryNorm
             0.45011488 = fieldWeight in 3671, product of:
               2.236068 = tf(freq=5.0), with freq of:
                 5.0 = termFreq=5.0
               3.6808684 = idf(docFreq=3042, maxDocs=44421)
               0.0546875 = fieldNorm(doc=3671)
         0.047591936 = weight(abstract_txt:profile in 3671) [ClassicSimilarity], result of:
           0.047591936 = score(doc=3671,freq=1.0), product of:
             0.13348079 = queryWeight, product of:
               1.4554062 = boost
               6.519684 = idf(docFreq=177, maxDocs=44421)
               0.014067211 = queryNorm
             0.3565452 = fieldWeight in 3671, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               6.519684 = idf(docFreq=177, maxDocs=44421)
               0.0546875 = fieldNorm(doc=3671)
         0.04365771 = weight(abstract_txt:proposed in 3671) [ClassicSimilarity], result of:
           0.04365771 = score(doc=3671,freq=3.0), product of:
             0.1000216 = queryWeight, product of:
               1.5430051 = boost
               4.608063 = idf(docFreq=1203, maxDocs=44421)
               0.014067211 = queryNorm
             0.4364828 = fieldWeight in 3671, product of:
               1.7320508 = tf(freq=3.0), with freq of:
                 3.0 = termFreq=3.0
               4.608063 = idf(docFreq=1203, maxDocs=44421)
               0.0546875 = fieldNorm(doc=3671)
         0.0068144803 = weight(abstract_txt:that in 3671) [ClassicSimilarity], result of:
           0.0068144803 = score(doc=3671,freq=1.0), product of:
             0.052689664 = queryWeight, product of:
               1.5837921 = boost
               2.3649352 = idf(docFreq=11344, maxDocs=44421)
               0.014067211 = queryNorm
             0.1293324 = fieldWeight in 3671, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               2.3649352 = idf(docFreq=11344, maxDocs=44421)
               0.0546875 = fieldNorm(doc=3671)
         0.029516604 = weight(abstract_txt:systems in 3671) [ClassicSimilarity], result of:
           0.029516604 = score(doc=3671,freq=3.0), product of:
             0.09135108 = queryWeight, product of:
               1.903714 = boost
               3.411175 = idf(docFreq=3984, maxDocs=44421)
               0.014067211 = queryNorm
             0.3231117 = fieldWeight in 3671, product of:
               1.7320508 = tf(freq=3.0), with freq of:
                 3.0 = termFreq=3.0
               3.411175 = idf(docFreq=3984, maxDocs=44421)
               0.0546875 = fieldNorm(doc=3671)
         0.09009022 = weight(abstract_txt:collaborative in 3671) [ClassicSimilarity], result of:
           0.09009022 = score(doc=3671,freq=3.0), product of:
             0.16212063 = queryWeight, product of:
               1.9644438 = boost
               5.866657 = idf(docFreq=341, maxDocs=44421)
               0.014067211 = queryNorm
             0.5556987 = fieldWeight in 3671, product of:
               1.7320508 = tf(freq=3.0), with freq of:
                 3.0 = termFreq=3.0
               5.866657 = idf(docFreq=341, maxDocs=44421)
               0.0546875 = fieldNorm(doc=3671)
         0.03197328 = weight(abstract_txt:techniques in 3671) [ClassicSimilarity], result of:
           0.03197328 = score(doc=3671,freq=1.0), product of:
             0.12900245 = queryWeight, product of:
               2.023433 = boost
               4.5321174 = idf(docFreq=1298, maxDocs=44421)
               0.014067211 = queryNorm
             0.24785016 = fieldWeight in 3671, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               4.5321174 = idf(docFreq=1298, maxDocs=44421)
               0.0546875 = fieldNorm(doc=3671)
         0.019140694 = weight(abstract_txt:this in 3671) [ClassicSimilarity], result of:
           0.019140694 = score(doc=3671,freq=4.0), product of:
             0.072728 = queryWeight, product of:
               2.1486003 = boost
               2.4062347 = idf(docFreq=10885, maxDocs=44421)
               0.014067211 = queryNorm
             0.26318192 = fieldWeight in 3671, product of:
               2.0 = tf(freq=4.0), with freq of:
                 4.0 = termFreq=4.0
               2.4062347 = idf(docFreq=10885, maxDocs=44421)
               0.0546875 = fieldNorm(doc=3671)
         0.024931954 = weight(abstract_txt:paper in 3671) [ClassicSimilarity], result of:
           0.024931954 = score(doc=3671,freq=1.0), product of:
             0.1317013 = queryWeight, product of:
               2.7046053 = boost
               3.4616103 = idf(docFreq=3788, maxDocs=44421)
               0.014067211 = queryNorm
             0.18930681 = fieldWeight in 3671, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               3.4616103 = idf(docFreq=3788, maxDocs=44421)
               0.0546875 = fieldNorm(doc=3671)
         0.5448946 = weight(abstract_txt:personalized in 3671) [ClassicSimilarity], result of:
           0.5448946 = score(doc=3671,freq=6.0), product of:
             0.56655717 = queryWeight, product of:
               5.609585 = boost
               7.179679 = idf(docFreq=91, maxDocs=44421)
               0.014067211 = queryNorm
             0.96176445 = fieldWeight in 3671, product of:
               2.4494898 = tf(freq=6.0), with freq of:
                 6.0 = termFreq=6.0
               7.179679 = idf(docFreq=91, maxDocs=44421)
               0.0546875 = fieldNorm(doc=3671)
       0.4 = coord(10/25)
   

4. Sah, M.; Wade, V.: Personalized concept-based search on the Linked Open Data (2015) 0.33

   0.33273846 = sum of:
     0.33273846 = product of:
       0.7562238 = sum of:
         0.022251356 = weight(abstract_txt:user in 3511) [ClassicSimilarity], result of:
           0.022251356 = score(doc=3511,freq=3.0), product of:
             0.0638201 = queryWeight, product of:
               1.2325349 = boost
               3.6808684 = idf(docFreq=3042, maxDocs=44421)
               0.014067211 = queryNorm
             0.3486575 = fieldWeight in 3511, product of:
               1.7320508 = tf(freq=3.0), with freq of:
                 3.0 = termFreq=3.0
               3.6808684 = idf(docFreq=3042, maxDocs=44421)
               0.0546875 = fieldNorm(doc=3511)
         0.033822633 = weight(abstract_txt:similarity in 3511) [ClassicSimilarity], result of:
           0.033822633 = score(doc=3511,freq=1.0), product of:
             0.10630038 = queryWeight, product of:
               1.2987999 = boost
               5.8181453 = idf(docFreq=358, maxDocs=44421)
               0.014067211 = queryNorm
             0.31817982 = fieldWeight in 3511, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               5.8181453 = idf(docFreq=358, maxDocs=44421)
               0.0546875 = fieldNorm(doc=3511)
         0.03961857 = weight(abstract_txt:enables in 3511) [ClassicSimilarity], result of:
           0.03961857 = score(doc=3511,freq=1.0), product of:
             0.11812152 = queryWeight, product of:
               1.3691131 = boost
               6.133123 = idf(docFreq=261, maxDocs=44421)
               0.014067211 = queryNorm
             0.33540517 = fieldWeight in 3511, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               6.133123 = idf(docFreq=261, maxDocs=44421)
               0.0546875 = fieldNorm(doc=3511)
         0.013628961 = weight(abstract_txt:that in 3511) [ClassicSimilarity], result of:
           0.013628961 = score(doc=3511,freq=4.0), product of:
             0.052689664 = queryWeight, product of:
               1.5837921 = boost
               2.3649352 = idf(docFreq=11344, maxDocs=44421)
               0.014067211 = queryNorm
             0.2586648 = fieldWeight in 3511, product of:
               2.0 = tf(freq=4.0), with freq of:
                 4.0 = termFreq=4.0
               2.3649352 = idf(docFreq=11344, maxDocs=44421)
               0.0546875 = fieldNorm(doc=3511)
         0.06809036 = weight(abstract_txt:evaluated in 3511) [ClassicSimilarity], result of:
           0.06809036 = score(doc=3511,freq=2.0), product of:
             0.15398344 = queryWeight, product of:
               1.9145093 = boost
               5.717531 = idf(docFreq=396, maxDocs=44421)
               0.014067211 = queryNorm
             0.44219273 = fieldWeight in 3511, product of:
               1.4142135 = tf(freq=2.0), with freq of:
                 2.0 = termFreq=2.0
               5.717531 = idf(docFreq=396, maxDocs=44421)
               0.0546875 = fieldNorm(doc=3511)
         0.03197328 = weight(abstract_txt:techniques in 3511) [ClassicSimilarity], result of:
           0.03197328 = score(doc=3511,freq=1.0), product of:
             0.12900245 = queryWeight, product of:
               2.023433 = boost
               4.5321174 = idf(docFreq=1298, maxDocs=44421)
               0.014067211 = queryNorm
             0.24785016 = fieldWeight in 3511, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               4.5321174 = idf(docFreq=1298, maxDocs=44421)
               0.0546875 = fieldNorm(doc=3511)
         0.013534515 = weight(abstract_txt:this in 3511) [ClassicSimilarity], result of:
           0.013534515 = score(doc=3511,freq=2.0), product of:
             0.072728 = queryWeight, product of:
               2.1486003 = boost
               2.4062347 = idf(docFreq=10885, maxDocs=44421)
               0.014067211 = queryNorm
             0.18609773 = fieldWeight in 3511, product of:
               1.4142135 = tf(freq=2.0), with freq of:
                 2.0 = termFreq=2.0
               2.4062347 = idf(docFreq=10885, maxDocs=44421)
               0.0546875 = fieldNorm(doc=3511)
         0.03525911 = weight(abstract_txt:paper in 3511) [ClassicSimilarity], result of:
           0.03525911 = score(doc=3511,freq=2.0), product of:
             0.1317013 = queryWeight, product of:
               2.7046053 = boost
               3.4616103 = idf(docFreq=3788, maxDocs=44421)
               0.014067211 = queryNorm
             0.26772028 = fieldWeight in 3511, product of:
               1.4142135 = tf(freq=2.0), with freq of:
                 2.0 = termFreq=2.0
               3.4616103 = idf(docFreq=3788, maxDocs=44421)
               0.0546875 = fieldNorm(doc=3511)
         0.08639059 = weight(abstract_txt:mechanism in 3511) [ClassicSimilarity], result of:
           0.08639059 = score(doc=3511,freq=1.0), product of:
             0.2502558 = queryWeight, product of:
               2.8182654 = boost
               6.312396 = idf(docFreq=218, maxDocs=44421)
               0.014067211 = queryNorm
             0.34520915 = fieldWeight in 3511, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               6.312396 = idf(docFreq=218, maxDocs=44421)
               0.0546875 = fieldNorm(doc=3511)
         0.026355779 = weight(abstract_txt:system in 3511) [ClassicSimilarity], result of:
           0.026355779 = score(doc=3511,freq=1.0), product of:
             0.14288953 = queryWeight, product of:
               3.0116537 = boost
               3.372775 = idf(docFreq=4140, maxDocs=44421)
               0.014067211 = queryNorm
             0.18444863 = fieldWeight in 3511, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               3.372775 = idf(docFreq=4140, maxDocs=44421)
               0.0546875 = fieldNorm(doc=3511)
         0.38529864 = weight(abstract_txt:personalized in 3511) [ClassicSimilarity], result of:
           0.38529864 = score(doc=3511,freq=3.0), product of:
             0.56655717 = queryWeight, product of:
               5.609585 = boost
               7.179679 = idf(docFreq=91, maxDocs=44421)
               0.014067211 = queryNorm
             0.68007016 = fieldWeight in 3511, product of:
               1.7320508 = tf(freq=3.0), with freq of:
                 3.0 = termFreq=3.0
               7.179679 = idf(docFreq=91, maxDocs=44421)
               0.0546875 = fieldNorm(doc=3511)
       0.44 = coord(11/25)
   

5. Díaz, A.; Gervás, P.: User-model based personalized summarization (2007) 0.25

   0.252991 = sum of:
     0.252991 = product of:
       0.7027527 = sum of:
         0.01764301 = weight(abstract_txt:evaluation in 1952) [ClassicSimilarity], result of:
           0.01764301 = score(doc=1952,freq=1.0), product of:
             0.06301593 = queryWeight, product of:
               4.479632 = idf(docFreq=1368, maxDocs=44421)
               0.014067211 = queryNorm
             0.279977 = fieldWeight in 1952, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               4.479632 = idf(docFreq=1368, maxDocs=44421)
               0.0625 = fieldNorm(doc=1952)
         0.038845148 = weight(abstract_txt:user in 1952) [ClassicSimilarity], result of:
           0.038845148 = score(doc=1952,freq=7.0), product of:
             0.0638201 = queryWeight, product of:
               1.2325349 = boost
               3.6808684 = idf(docFreq=3042, maxDocs=44421)
               0.014067211 = queryNorm
             0.60866636 = fieldWeight in 1952, product of:
               2.6457512 = tf(freq=7.0), with freq of:
                 7.0 = termFreq=7.0
               3.6808684 = idf(docFreq=3042, maxDocs=44421)
               0.0625 = fieldNorm(doc=1952)
         0.017099997 = weight(abstract_txt:other in 1952) [ClassicSimilarity], result of:
           0.017099997 = score(doc=1952,freq=1.0), product of:
             0.07775755 = queryWeight, product of:
               1.5709455 = boost
               3.5186288 = idf(docFreq=3578, maxDocs=44421)
               0.014067211 = queryNorm
             0.2199143 = fieldWeight in 1952, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               3.5186288 = idf(docFreq=3578, maxDocs=44421)
               0.0625 = fieldNorm(doc=1952)
         0.019076573 = weight(abstract_txt:that in 1952) [ClassicSimilarity], result of:
           0.019076573 = score(doc=1952,freq=6.0), product of:
             0.052689664 = queryWeight, product of:
               1.5837921 = boost
               2.3649352 = idf(docFreq=11344, maxDocs=44421)
               0.014067211 = queryNorm
             0.3620553 = fieldWeight in 1952, product of:
               2.4494898 = tf(freq=6.0), with freq of:
                 6.0 = termFreq=6.0
               2.3649352 = idf(docFreq=11344, maxDocs=44421)
               0.0625 = fieldNorm(doc=1952)
         0.027543092 = weight(abstract_txt:systems in 1952) [ClassicSimilarity], result of:
           0.027543092 = score(doc=1952,freq=2.0), product of:
             0.09135108 = queryWeight, product of:
               1.903714 = boost
               3.411175 = idf(docFreq=3984, maxDocs=44421)
               0.014067211 = queryNorm
             0.30150813 = fieldWeight in 1952, product of:
               1.4142135 = tf(freq=2.0), with freq of:
                 2.0 = termFreq=2.0
               3.411175 = idf(docFreq=3984, maxDocs=44421)
               0.0625 = fieldNorm(doc=1952)
         0.015468017 = weight(abstract_txt:this in 1952) [ClassicSimilarity], result of:
           0.015468017 = score(doc=1952,freq=2.0), product of:
             0.072728 = queryWeight, product of:
               2.1486003 = boost
               2.4062347 = idf(docFreq=10885, maxDocs=44421)
               0.014067211 = queryNorm
             0.21268311 = fieldWeight in 1952, product of:
               1.4142135 = tf(freq=2.0), with freq of:
                 2.0 = termFreq=2.0
               2.4062347 = idf(docFreq=10885, maxDocs=44421)
               0.0625 = fieldNorm(doc=1952)
         0.028493663 = weight(abstract_txt:paper in 1952) [ClassicSimilarity], result of:
           0.028493663 = score(doc=1952,freq=1.0), product of:
             0.1317013 = queryWeight, product of:
               2.7046053 = boost
               3.4616103 = idf(docFreq=3788, maxDocs=44421)
               0.014067211 = queryNorm
             0.21635064 = fieldWeight in 1952, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               3.4616103 = idf(docFreq=3788, maxDocs=44421)
               0.0625 = fieldNorm(doc=1952)
         0.03012089 = weight(abstract_txt:system in 1952) [ClassicSimilarity], result of:
           0.03012089 = score(doc=1952,freq=1.0), product of:
             0.14288953 = queryWeight, product of:
               3.0116537 = boost
               3.372775 = idf(docFreq=4140, maxDocs=44421)
               0.014067211 = queryNorm
             0.21079844 = fieldWeight in 1952, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               3.372775 = idf(docFreq=4140, maxDocs=44421)
               0.0625 = fieldNorm(doc=1952)
         0.5084623 = weight(abstract_txt:personalized in 1952) [ClassicSimilarity], result of:
           0.5084623 = score(doc=1952,freq=4.0), product of:
             0.56655717 = queryWeight, product of:
               5.609585 = boost
               7.179679 = idf(docFreq=91, maxDocs=44421)
               0.014067211 = queryNorm
             0.89745986 = fieldWeight in 1952, product of:
               2.0 = tf(freq=4.0), with freq of:
                 4.0 = termFreq=4.0
               7.179679 = idf(docFreq=91, maxDocs=44421)
               0.0625 = fieldNorm(doc=1952)
       0.36 = coord(9/25)