Hong Kong Baptist University

About: Hong Kong Baptist University is a education organization based out in Hong Kong, China. It is known for research contribution in the topics: Population & China. The organization has 7811 authors who have published 18919 publications receiving 555274 citations. The organization is also known as: Hong Kong Baptist College & HKBU.

Super-resolution reconstruction in a computational compound-eye imaging system

Abstract: From consumer electronics to biomedical applications, device miniaturization has shown to be highly desirable. This often includes reducing the size of some optical systems. However, diffraction effects impose a constraint on image quality when we simply scale down the imaging parameters. Over the past few years, compound-eye imaging system has emerged as a promising architecture in the development of compact visual systems. Because multiple low-resolution (LR) sub-images are captured, post-processing algorithms for the reconstruction of a high-resolution (HR) final image from the LR images play a critical role in affecting the image quality. In this paper, we describe and investigate the performance of a compound-eye system recently reported in the literature. We discuss both the physical construction and the mathematical model of the imaging components, followed by an application of our super-resolution algorithm in reconstructing the image. We then explore several variations of the imaging system, such as the incorporation of a phase mask in extending the depth of field, which are not possible with a traditional camera. Simulations with a versatile virtual camera system that we have built verify the feasibility of these additions, and we also report the tolerance of the compound-eye system to variations in physical parameters, such as optical aberrations, that are inevitable in actual systems.

The impact of market orientation and strategic HRM on firm performance: the case of Chinese enterprises

Abstract: This study examines market orientation as the antecedent to strategic human resource management (SHRM), and the related effects on firm performance in an emerging economy context. It is suggested that the relationship between SHRM and firm performance is moderated by ownership type and autonomy in staffing of these firms. Empirical results from a sample of Chinese firms from various industries and regions reveal that SHRM mediates the relationship between market orientation and firm performance. It is also found that the effect of SHRM on firm performance is stronger for firms with a higher degree of autonomy in staffing, and weaker for private firms. Other types of ownership (state or foreign) have no effect on this relationship.

Symmetric Versus Unsymmetric Platinum(II) Bis(aryleneethynylene)s with Distinct Electronic Structures for Optical Power Limiting/Optical Transparency Trade‐off Optimization

Abstract: A new series of symmetric and unsymmetric Pt(ll) bis(acetylide) complexes of the type D-C≡C-Pt(PBu 3 ) 2 -C≡C-D (D-Pt-D), A-C≡C-Pt(PBi 3 ) 2 -C≡C-A (A-Pt-A) and D-C≡C-Pt(PBu 3 ) 2 -C≡C-A (D-Pt-A) (D, donor groups; A, acceptor groups) are synthesized, and show superior optical power limiting (OPL)/optical transparency trade-offs. By tailoring the electronic properties of the aryleneethynylene group, distinct electronic structures for these metalated complexes can be obtained, which significantly affect their photophysical behavior and OPL properties for a nanosecond laser pulse at 532 nm. Electronic influence of the ligand type and the molecular symmetry of metal group on the optical transparency/nonlinearity optimization is thoroughly elucidated. Generally, aryleneethynylene ligands with π electron-accepting nature will effectively enhance the harvesting efficiency of the triplet excited states. The ligand variation to the OPL strength of these Pt(ll) compounds follows the order: D-Pt-D > D-Pt-A > A-Pt-A. These results could be attributed to the distinctive excited state character induced by their different electronic structures, on the basis of the data from both photophysical studies and theoretical calculations. All of the complexes show very good optical transparencies in the visible-light region and exhibit excellent OPL responses with very impressive figure of merit σ ex /σ o values (up to 17), which remarkably outweigh those of state-of-the-art reverse saturable absorption dyes such as C 60 and metallophthalocyanines with very poor transparencies. Their lower optical-limiting thresholds (0.05 J cm -2 at 92% linear transmittance) compared with that of the best materials (ca. 0.07 j J cm -2 for InPc and PbPc dyes) currently in use will render these highly transparent materials promising candidates for practical OPL devices for the protection of human eyes and other delicate electro-optic sensors.