Character Segmentation in Asian Collector's Seal Imprints: An Attempt to Retrieval Based on Ancient Character Typeface

Collector's seals provide important clues about the ownership of a book. They contain much information pertaining to the essential elements of ancient materials and also show the details of possession, its relation to the book, the identity of the collectors and their social status and wealth, amongst others. Asian collectors have typically used artistic ancient characters rather than modern ones to make their seals. In addition to the owner's name, several other words are used to express more profound meanings. A system that automatically recognizes these characters can help enthusiasts and professionals better understand the background information of these seals. However, there is a lack of training data and labelled images, as samples of some seals are scarce and most of them are degraded images. It is necessary to find new ways to make full use of such scarce data. While these data are available online, they do not contain information on the characters'position. The goal of this research is to provide retrieval tools assist in obtaining more information from Asian collector's seals imprints without consuming a lot of computational resources. In this paper, a character segmentation method is proposed to predict the candidate characters'area without any labelled training data that contain character coordinate information. A retrieval-based recognition system that focuses on a single character is also proposed to support seal retrieval and matching. The experimental results demonstrate that the proposed character segmentation method performs well on Asian collector's seals, with 92% of the test data being correctly segmented

Exploring psychological mechanisms of personalised advertising affecting online impulse buying in the social commerce context

Purpose - The purpose of this research is to investigate how perceived personalisation of social media advertising influences online impulse buying. In the context of social commerce, this study focused on the factors associated with advertising and their determinant roles in impulse buying. Using S-O-R as a theoretical basis, this research establishes a multi-step theoretical model incorporating Perceived ad personalisation, Perceived interactivity, Perceived involvement, and Arousal as predictors of impulse buying. Accordingly, this research seeks to disclose the mechanisms of multiple paths that could reveal the influence of the advertising’s psychological effects on consumers’ purchase intentions. Design/methodology/approach - This research is considered confirmatory in nature to extend the existing literature. The research paradigm of positivism is employed to conduct the project. The quantitative approach is therefore applicable to this study. Specifically, this research conducted an online survey using measurements adapted from the previous work. 313 valid responses were collected and used for the statistical analysis. Confirmatory factor analysis was employed to examine the reliability and validity of the measurement scales, followed by structural equation modelling to test the hypotheses. Findings - The results of data analysis indicated the predictive role of perceived ad personalisation on online impulse buying. Specifically, this research highlighted the indirect effect of Perceived ad personalisation on Urge to buy impulsively through Perceived involvement and Arousal. The findings confirmed the positive relationship between Perceived ad personalisation and Perceived interactivity, Perceived involvement and Arousal, respectively. In turn, Perceived involvement and Arousal positively related Urge to buy impulsively, whereas Perceived interactivity failed to pose a significant direct effect on the dependent variable. Further to this, it is thought that Perceived interactivity and Arousal may perform serial mediating effects that underlie the hypothesised psychological process as they were both shown to positively influence Perceived involvement. Originality/value - This research mainly contributes to incorporating the three intervening factors of Perceived interactivity, Perceived involvement and Arousal to the psychological mechanisms from Perceived ad personalisation to online impulse buying by extending the theoretical framework of S-O-R. This study also shed light on further studies pertinent in the context of social commerce, considering its empirical findings. Key words – social media advertising; online impulse buying; social commerce; perceived personalisation; perceived interactivity; perceived involvement; arousal

catena-Poly[[(1,10-phenanthroline-κ2 N,N′)copper(I)]-μ2-iodido]

The solvothermal reaction of copper(I) iodide and 1,10-phenanthroline (phen) in ethanol yielded the title polymeric compound, [CuI(C12H8N2)]n. The asymmmetric unit comprises one Cu+ cation, one I− anion and one phen ligand. Each Cu+ cation is in a distorted tetrahedral coordination by two iodide anions and two N atoms from a bidentate chelating phen ligand. The Cu+ cations are bridged through the iodide anions, leading to a zigzag chain structure extending parallel to [100]. There are π–π inter­actions among adjacent phen ligands of one chain [centroid–centroid distance = 3.693 (3) Å]

Two-dimensional dysprosium(III) triiodate(V) dihydrate, Dy(IO3)3(H2O)·H2O

During our research into novel nonlinear optical materials using 1,10-phenanthroline as an appending ligand on lanthanide iodates, crystals of an infinite layered DyIII iodate compound, Dy(IO3)3(H2O)·H2O, were obtained under hydro­thermal conditions. The DyIII cation has a dicapped trigonal prismatic coordination environment consisting of one water O atom and seven other O atoms from seven iodate anions. These iodate anions bridge the DyIII cations into a two-dimensional structure. Through O—H⋯O hydrogen bonds, all of these layers stack along [111], giving a supra­molecular channel, with the solvent water mol­ecules filling the voids

Exploring psychological mechanisms of personalised advertising affecting online impulse buying in the social commerce context

Purpose - The purpose of this research is to investigate how perceived personalisation of social media advertising influences online impulse buying. In the context of social commerce, this study focused on the factors associated with advertising and their determinant roles in impulse buying. Using S-O-R as a theoretical basis, this research establishes a multi-step theoretical model incorporating Perceived ad personalisation, Perceived interactivity, Perceived involvement, and Arousal as predictors of impulse buying. Accordingly, this research seeks to disclose the mechanisms of multiple paths that could reveal the influence of the advertising’s psychological effects on consumers’ purchase intentions. Design/methodology/approach - This research is considered confirmatory in nature to extend the existing literature. The research paradigm of positivism is employed to conduct the project. The quantitative approach is therefore applicable to this study. Specifically, this research conducted an online survey using measurements adapted from the previous work. 313 valid responses were collected and used for the statistical analysis. Confirmatory factor analysis was employed to examine the reliability and validity of the measurement scales, followed by structural equation modelling to test the hypotheses. Findings - The results of data analysis indicated the predictive role of perceived ad personalisation on online impulse buying. Specifically, this research highlighted the indirect effect of Perceived ad personalisation on Urge to buy impulsively through Perceived involvement and Arousal. The findings confirmed the positive relationship between Perceived ad personalisation and Perceived interactivity, Perceived involvement and Arousal, respectively. In turn, Perceived involvement and Arousal positively related Urge to buy impulsively, whereas Perceived interactivity failed to pose a significant direct effect on the dependent variable. Further to this, it is thought that Perceived interactivity and Arousal may perform serial mediating effects that underlie the hypothesised psychological process as they were both shown to positively influence Perceived involvement. Originality/value - This research mainly contributes to incorporating the three intervening factors of Perceived interactivity, Perceived involvement and Arousal to the psychological mechanisms from Perceived ad personalisation to online impulse buying by extending the theoretical framework of S-O-R. This study also shed light on further studies pertinent in the context of social commerce, considering its empirical findings. Key words – social media advertising; online impulse buying; social commerce; perceived personalisation; perceived interactivity; perceived involvement; arousal

Copper catalyzed tandem asymmetric conjugate addition cyclization reaction in presence of chiral phosphoramidite ligands

Copper-catalyzed intramolecular conjugate addition–cyclization in the presence of chiral phosphoramidite ligands was described. Cyclic products with multiple chiral centers were obtained with up to 93:7 diastereomeric ratio and 94% ee

Copper-Catalyzed Enantioselective Intramolecular Conjugate Addition/Trapping Reactions: Synthesis of Cyclic Compounds with Multichiral Centers

The Cu-catalyzed enantioselective conjugate addition of dialkylzinc to bis-alpha,beta-unsaturated carbonyl compounds followed by the intramolecular trapping of the zinc enolate in the presence of chiral phosphoramidite ligands was investigated. Cyclic and heterocyclic compounds with multichiral centers were formed as a mixture of two diastereomers with excellent diastereoselectivities (up to 99:1) and enantioselectivities (up to 94 % ee, ee=enantiomeric excess). The stereochemistry was determined to be trans,trans for the major products and trans,cis for the minor products. The absolute configuration of the cyclic compounds was assigned by comparison with the analogous adduct derived from trans-3-nonen-2-one and Et(2)Zn or the adduct obtained through conjugate addition of Me(2)Zn to trans-1-phenyl-non-2-en-1-one. Further transformation of these cyclic products into more complex compounds is under investigation in our laboratory

Asymmetric conjugate addition to α-halo enones : Dramatic effect of styrene on the enantioselectivity

A simple trick could prove generally valuable for asymmetric copper-catalyzed conjugate addition reactions. It was found that the enantioselectivities of such reactions of dialkyl zinc reagents with α-halo enones in the presence of chiral phosphorimidite ligands were dramatically improved upon the addition of styrene, which acts as a radical scavenger to suppress the competitive non-asymmetric radical pathway (see example)

Copper catalyzed asymmetric conjugate addition-bromination of α, β unsaturated ketones : a highly effective one pot reaction for the synthesis of chiral α bromo β alkyl ketone

An efficient one-pot reaction for the synthesis of chiral a-bromo-ß-alkyl ketones was developed. The final products were obtained with excellent enantiomeric excess and good isolated yields. The synthetic potential was illustrated by the radical cyclization of the a-brominated ketone