No abstract

No abstract

The huge amount of information available in the currently evolving world wide information infrastructure at any one time can easily overwhelm end-users. One way to address the information explosion is to use an "information filtering agent" which can select information according to the interest and/or need of an end-user. However, at present few such information filtering agents exist. In this study, we evaluate the use of feature-based approaches to user modcling with the purpose of creating a filtering agent for the video-on-demand application. We evaluate several feature and clique-based models for 10 voluntary subjects who provided ratings for the movies. Our preliminary results suggest that feature-based selection can be a useful tool to recommend movies according to the taste of the user and can be as effective as a movie rating expert. We compare our feature-based approach with a clique-based approach, which has advantages whcrc information from other users is available.

Ghwhfwlrq ri qhdu gxsolfdwh grfxphqwv lv dq lpsruwdqw sure0 ohp lq pdq| gdwd plqlqj dqg lqirupdwlrq owhulqj dssolfd0 wlrqv1 Zkhq idfhg zlwk pdvvlyh txdqwlwlhv ri gdwd/ wudgl0 wlrqdo gxsolfdwh ghwhfwlrq whfkqltxhv uho|lqj rq gluhfw lqwhu0 grfxphqw vlplodulw| frpsxwdwlrq +h1j1/ xvlqj wkh frvlqh phd0 vxuh, duh riwhq qrw ihdvleoh jlyhq wkh wlph dqg phpru| shu0 irupdqfh frqvwudlqwv1 Rq wkh rwkhu kdqg/ qjhusulqw0edvhg phwkrgv/ vxfk dv L0Pdwfk/ duh yhu| dwwudfwlyh frpsxwd0 wlrqdoo| exw pd| eh eulwwoh zlwk uhvshfw wr vpdoo fkdqjhv wr grfxphqw frqwhqw1 Zh irfxv rq dssurdfkhv wr qhdu0 uhsolfd ghwhfwlrq wkdw duh edvhg xsrq odujh0froohfwlrq vwd0 wlvwlfv dqg suhvhqw d jhqhudo whfkqltxh ri lqfuhdvlqj wkhlu urexvwqhvv yld pxowlsoh oh{lfrq udqgrpl}dwlrq1 Lq h{shu0 lphqwv zlwk odujh zhe0sdjh dqg vsdp0hpdlo gdwdvhwv wkh sursrvhg phwkrg lv vkrzq wr frqvlvwhqwo| rxwshuirup wudgl0 wlrqdo L0Pdwfk/ zlwk wkh uhodwlyh lpsuryhphqw lq gxsolfdwh0 grfxphqw uhfdoo uhdfklqj dv kljk dv 73093(1 Wkh odujh jdlqv lq ghwhfwlrq dffxudf| duh rvhw e| rqo| vpdoo lqfuhdvhv lq frpsxwdwlrqdo uhtxluhphqwv1Fdwhjrulhv dqg Vxemhfw Ghvfulswruv= K151;^Gdwdedvh Pdqdjhphqw`= Gdwdedvh Dssolfdwlrqv 0 Gdwd Plqlqj Jhqhudo Whupv= Dojrulwkpv/ H{shulphqwdwlrq/ Uholdelo0 lw|1 Nh|zrugv= Ghgxsolfdwlrq/ Gdwd Fohdqlqj/ Vsdp Ilowhulqj/ Zhe Plqlqj1

We have measured the cross sections at 90° cm. for n* and 7r° photoproduction with polarized photons. The photon energies ranged from 0.8 to 2.2 GeV. We compare the resonant "bumps" in the cross section with theoretical models. The measured asymmetry agrees with a quark-model calculation though the predicted cross sections are low.