608 research outputs found
A New Approach of Clustering Feedback Sessions for Inferring User Search Goals
Internet information is growing every day exponentially. In order to find out the exact required information from this web search engines has become absolutely necessary tool for the web users. It has also become more difficult to provide user the required information. When Different users provide an ambiguous query to a search engine, they might be having different search goals. Therefore, it is required to find and analyze user search goals to improve the performance of a search engine and user experience. By representing the results in cluster we find out different user search goals for a query. It has advantages in improving search engine relevance and user experience. It extends the delivery and quality of internet information services to the end user. It also improves performance of Web server system. Query classification, search result reorganization and session boundary detection are the approaches attempt to find out user search goals. But the mentioned approaches has many limitations. A new approach has been implemented that overcomes the limitations and analyze, discover user search goals using feedback sessions. This approach first takes the user search query. For each single result of the search query pseudo-documents are generated. Using K-means++ clustering algorithm, these pseudo-documents are clustered. Each cluster can be considered as one user search goal. Finally in restructured result is given to the user where each URL is categorized into a cluster centered by the inferred search goals. Then depending upon user click through, results are restructured and represented to the user in order to satisfy the information need.
DOI: 10.17762/ijritcc2321-8169.15071
Survey on the Use of Feedback Sessions for Inferring User Search Goals
Largest source of web traffic are search engines. Search engines are being used by different kind of users for different purpose. When users are searching something they have a different search goal in mind. Thus the queries are mostly ambiguous one. In order to improve search engine relevance and thus user experience inference and analysis of user search is required. To get the best results it is needful to capture different user search goals. This paper first talks about the different ways of inferring user search goals. Then insights of new approach has been discussed. A new algorithm firstly specifies a framework to analyze user search goals by clustering feedback sessions. There should be a proper way to represent these feedback sessions. In the second step of this algorithm pseudo-documents are prepared to represent feedback sessions. With this original results are restructured. This in turn is used to select optimal user search goals
Soft gluon radiation and energy dependence of total hadronic cross-sections
An impact parameter representation for soft gluon radiation is applied to
obtain both the initial decrease of the total cross-section ()
for proton-proton collisions as well as the later rise of with
energy for both and . The non-perturbative soft part of the
eikonal includes only limited low energy gluon emission and leads to the
initial decrease in the proton-proton cross- section. On the other hand, the
rapid rise in the hard, perturbative jet part of the eikonal is tamed into the
experimentally observed mild increase by soft gluon radiation whose maximum
energy rises slowly with energy.Comment: 30 pages, 6 figures. Version accepted for publication in Physical
Review D. Additional section with explanatory material added making the paper
more self contained and two figures changed to have a complete summary of the
available accelerator dat
Subtle Radiological Features of Splenic Avulsion following Abdominal Trauma
Splenic trauma in children following blunt abdominal injury is usually treated by nonoperative management (NOM). Splenectomy following abdominal trauma is rare in children. NOM is successful as in the majority of instances the injury to the spleen is contained within its capsule or a localised haematoma. Rarely, the spleen may suffer from an avulsion injury that causes severe uncontrollable bleeding and necessitates an emergency laparotomy and splenectomy. We report two cases of children requiring splenectomy following severe blunt abdominal injury. In both instances emergency laparotomy was undertaken for uncontrollable bleeding despite resuscitation. The operating team was unaware of the precise source of bleeding preoperatively. Retrospective review of the computed tomography (CT) scans revealed subtle radiological features that indicate splenic avulsion. We wish to highlight these radiological features of splenic avulsion as they can help to focus management decisions regarding the need/timing for a laparotomy following blunt abdominal trauma in children
Intense blue-emitting Ca5Al8O14 : Eu phosphor for mercury free lamp
The calcium aluminates doped with Eu ions, Ca5Al8O14 : Eu, phosphors are prepared by the
combustion method. The formation of crystalline aluminates was confirmed by X-ray diffraction pattern. The
prepared phosphors were characterized by SEM, TGA, DTA, particle size analyzer and Photoluminescence (PL)
techniques. From the UV-excited luminescence spectra it was found that the Eu ions acts as a luminescent
centre with luminescence at the blue (λmax = 470 nm) region due to 4f 65d1 → 4f 7 transition. The excitation
spectra show the broad band at 355 nm wavelength (λem = 470 nm). The excitation 355 nm is a mercury free
excitation and therefore Ca5Al8O14 : Eu may be useful for the solid state lighting phosphor in lamp industry.Intense blue-emitting Ca5Al8O14 : Eu phosphor for mercury free lamp
Abhay D Deshmukh1*, S J Dhoble1, S V Godbole2, M K Bhide2 and D R Peshwe3
1Kamla Nehru College, Sakkardara Square, Nagpur-440 009, Maharashtra, India
2Spectroscopy Section, Radiochemistry Division, Bhabha Atomic Research Centre,
Mumbai-400 085, India
3Department of Metallurgical and Materials Engineering, VNIT, Nagpur-440 011,
Maharashtra, India
E-mail : [email protected] Nehru College, Sakkardara Square, Nagpur-440 009, Maharashtra, India
2Spectroscopy Section, Radiochemistry Division, Bhabha Atomic Research Centre,
Mumbai-400 085, India
3Department of Metallurgical and Materials Engineering, VNIT, Nagpur-440 011,
Maharashtra, Indi
Hadronic Cross-sections in two photon Processes at a Future Linear Collider
In this note we address the issue of measurability of the hadronic
cross-sections at a future photon collider as well as for the two-photon
processes at a future high energy linear collider. We extend, to
higher energy, our previous estimates of the accuracy with which the \gamgam\
cross-section needs to be measured, in order to distinguish between different
theoretical models of energy dependence of the total cross-sections. We show
that the necessary precision to discriminate among these models is indeed
possible at future linear colliders in the Photon Collider option. Further we
note that even in the option a measurement of the hadron production
cross-section via \gamgam processes, with an accuracy necessary to allow
discrimination between different theoretical models, should be possible. We
also comment briefly on the implications of these predictions for hadronic
backgrounds at the future TeV energy collider CLIC.Comment: 20 pages, 5 figures, LaTeX. Added an acknowledgemen
High Precision and -production data and the Nuclear Glue
We use the high statistics E-772 data on the nuclear dependence of the
production of quarkonia and and dimuons at large
transverse momentum in - collisions to get information about the
gluonic EMC effect. We find a satisfactory quantitative agreement of the
theoretical predictions with the data although none of the models of the EMC
effect we consider could account for the entire data. Since all the qualitative
features are understood none the less in terms of perturbative QCD with nuclear
dependent parton densities, our results suggest that these data can now be used
for a better determination of the nuclear parton densities. Our conslusions are
shown to be insensitive to the hadronisation mechanism for the quarkonia.Comment: 28 pages, 8 Figures (included as uuencoded figs.uu file at the end),
RevTeX, TIFR/TH/93-57, BU-TH-93/
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