Báo cáo khoa học: "STRUCTURAL DISAMBIGUATION WITH CONSTRAINT PROPAGATION" pot

... ing and successive disambiguation are performed by adding new constraints to the constraint network. Newly added constraints are efficiently propagated over the network by Constraint Propagation ... <0BJ,I>, and so on. An arc in a constraint network represents a bi- nary constraint imposed on two roles. Each arc is associated with a two-dimensional matrix called a c...

Ngày tải lên: 08/03/2014, 18:20

... of finding the word-sense-chain with maximum overlap can be viewed as a specialised example of the class of constraint- based optimisation problems for which Constraint Handling In Prolog (CHIP) ... describe how a constraint can be satisfied). In addition, classes of built-in predicates over finite domain variables exist for: (1) arithmetic and symbolic constraints (basic constra...

Ngày tải lên: 22/02/2014, 10:20

... class with each word and collecting statistics on word class co-occurrences. For instance, instead of calculating the probability of (eat, bread) di- rectly, these methods associate eat with ... classes, however. Some class- based methods (e.g., Yarowsky, 1992) associate each word with a single class without considcr- ing the other words in the co-occurrence. How- ever, a word...

Ngày tải lên: 17/03/2014, 07:20

... satisfies a set of linguistic constraints. I will identify some properties of linguistic constraints which allow this problem to be solved efficiently using constraint satisfaction algorithms. ... multiple constraints, each describing a certain dimension of linguistic knowledge. The grammar is partitioned into operations and constraints. Some of these are given in (1); note that ma...

Ngày tải lên: 23/03/2014, 20:20

... spectrometer with a magnet (Oxford Instruments) operating with a 1 H frequency of 500 MHz. The sample was maintained at a temperature of 25 °C. Gradient enhanced HSQC spectra were collected with a ... buffer and mixed with 0.5 lmol PhK5 peptide. The complex was concentrated using a centricon filter unit with a 3 kDa cut-off to a final concentration of 0.75 mm. Data were processed wit...

Ngày tải lên: 19/02/2014, 17:20

... Proceedings of EACL '99 POS Disambiguation and Unknown Word Guessing with Decision Trees Giorgos S. Orphanos Computer Engineering & Informatics ... specific problems. The decision trees induced are combined with a high- coverage lexicon to form a tagger that achieves 93,5% overall disambiguation accuracy. 1 Introduction Part-of-speech ... Participle). Towards the...

Ngày tải lên: 22/02/2014, 03:20

... with a naive Bayes classifier, the sense s assigned to an example with features f 1 , . . . , f n is chosen so as to maximize: p(s) n  j=1 p(f j |s) In our domain adaptation study, we start with ... different contexts is known as word sense disambiguation (WSD). To date, the best performing systems in WSD use a corpus-based, supervised learning approach. With this approach, one woul...

Ngày tải lên: 08/03/2014, 02:21

... actually introduce an additional and new layer of abstraction, which, we hypothesize, aligns well with the task of parse disambiguation: we first parse the unlabeled data. In this way we obtain full ... 2007). Of these, Mc- Closky et al. (2006) deal specifically with self- training for data-driven statistical parsing. They show that together with a re-ranker, improvements 37 are obtaine...

Ngày tải lên: 08/03/2014, 21:20

... named entity disambiguation me- thods. Currently, the common methods for named entity disambiguation include name ob- servation clustering (Bagga and Baldwin, 1998) and entity linking with knowledge ... transition rate from node i to node j with path length k, we can view the λ as a penalty factor for the transition path length: by setting the λ with a value within (0, 1),...

Ngày tải lên: 16/03/2014, 23:20

... drawn with molscript [34] and rendered with bobscript [35] and raster3d [36]. Molecular surface analysis Molecular surface and electrostatic potentials were calcula- ted and displayed with grasp ... tetramers showing the distribution of the electrostatic potentials. The negative poten- tial is coloured red and displayed at )5 kT level, the positive poten- tial is colored blue and displa...

Ngày tải lên: 30/03/2014, 20:20