This paper describes the system that has been used by TeamX in SemEval-2014 Task 9 Subtask B. The system is a sentiment analyzer based on a supervised text categorization approach designed with following two concepts. Firstly, since lexicon features were shown to be effective in SemEval-2013 Task 2, various lexicons and pre-processors for them are introduced to enhance lexical information. Secondly, since a distribution of sentiment on tweets is known to be unbalanced, an weighting scheme is introduced to bias an output of a machine learner. For the test run, the system was tuned towards Twitter texts and successfully achieved high scoring results on Twitter data, average F 1 70.96 on Twitter2014 and average F 1 56.50 on Twitter2014Sarcasm.
Profile inference of SNS users is valuable for marketing, target advertisement, and opinion polls. Several studies examining profile inference have been reported to date. Although information of various types is included in SNS, most such studies only use text information. It is expected that incorporating information of other types into text classifiers can provide more accurate profile inference. As described in this paper, we propose combined method of text processing and image processing to improve gender inference accuracy. By applying the simple formula to combine two results derived from a text processor and an image processor, significantly increased accuracy was confirmed.
Poly(octadecyl acrylate) exists in a crystalline state at room temperature. This crystalline state was formed even after being grafted onto silica through the terminal group of the polymer. When this polymer-grafted silica (SiI-ODAn) was used as a reversed phase liquid chromatography packing material, better selectivity for diastereomerized phenylethylamines derivatized by (S)-(-)-(2,3-naphthalenedicarboximidyl)propionyl fluoride was observed at room temperature than was observed for simple octadecylated silica (aDS). On the other hand, increasing temperature reduced the selectivity to be close to that of ODE Additional experiments showed the better selectivity derived from SiI-ODAn was due to both the highly-oriented structure of the polymer and the carbonyl-rc interaction with the diastereomer. A theoretical investigation of this carbonyl-rc interaction is also described briefly.mainly as an organic stationary phase in RPLC. However, since the hydrophobicity difference between diastereomers is rather small, a D S usually shows low selectivity. Therefore, we focus on the fact that the above-mentioned diastereomerizing reagents have chromophoric groups which can work as a ~-~ interaction source. From these considerations, we applied poly(long-chain alkyl acrylate)grafted silicas (Sil-ODAn and Sil-DCAn) as packing materials for diastereomer separation in an RPLC mode. These polymeric organic phases have been developed by us [8 10] and are very attractive for the following reasons: (1) they have many carbonyl groups that act as ~-electron sources and (2) they undergo a temperature-induced crystalline-to-isotropic phase transition as schematically illustrated in Figure 1. In this paper, we wish to report that diastereomeric separation can be enhanced through high orientation of the carbonyl groups on silica.Original
Aminopalladation of olefins is theoretically investigated here as an example of palladium-assisted nucleophilic attack on a coordinated olefin by an ab initio MO method and energy decomposition analysis. In [PdF3(C2H4)f and PdF2(NH3)(C2H4), the trans attack of a nucleophile, NH3, on the coordinated ethylene causes significant destabilization. In [PdF(NH3)2(C2H4)]+ and [PdF(PH3)2(C2H4)]+, on the other hand, the trans attack of NH3 proceeds easily with a rather small activation barrier. These results suggest that the active species is a cationic palladium(II)-olefin complex. Analyses of the interaction energy and electron distribution indicate that not only charge transfer from the nucleophile, NH3, to C2H4 but also polarization of the Pd-C2H4 moiety is important to the reaction. Orbital mixings for frontier orbitals proposed here clearly elucidate why the cationic complex accelerates nucleophilic attack but why both the neutral and anionic complexes hardly do and how the geometry and electronic structure change during the reaction.
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