An empirical study on the effect of internal marketing on frontline service employees' performance

2008-2009 > Academic research: refereed > Publication in refereed journalVersion of RecordPublishe

Realization of Pan Jiazheng′s extremum principle with optimization methods

2007-2008 > Academic research: refereed > Publication in refereed journalVersion of RecordPublishe

An approach to achieve message efficient early-stopping uniform consensus protocols

2003-2004 > Academic research: refereed > Refereed conference paperVersion of RecordPublishe

Spatial heterogeneity and driving forces of environmental productivity growth in China: Would it help to switch pollutant discharge fees to environmental taxes?

© 2019 Elsevier Ltd Emission charge policy has recently switched from pollutant discharge fees to environmental taxes in China. Considering spatial heterogeneity, the effects of changes in emission charge policy may subject to different Chinese regions. In this study, environmental efficiencies of Chinese regions are evaluated through provincial environmentally extended input-output tables and a frontier-based optimization model. Driving factors of environmental productivity growth are identified through global Luenberger productivity decomposition approach. Moreover, spatial heterogeneity on the effects of change in emission charge policy on environment and economy are assessed. Results show that all regions experienced environmental productivity growth. Technology progress is the major driving factor in most regions with an average contribution of 90%, while technical efficiency regress slows environmental productivity growth in Southwest region. Switching from pollutant discharge fees to environmental taxes would decreases emission intensities by 1.42% on average, but it would have different negative impact on economic growth (−1.13%∼-4.90% of regional GDP) due to spatially heterogeneous trade-offs between environmental protection and economic development. Addressing such spatial heterogeneity provide not only a basis for diversified tax rate determination but also a framework for other environmental policy assessment

Asymmetric hydroformylation of styrene catalyzed by pyranoside diphosphite-rh(Ⅰ) complexes

2006-2007 > Academic research: refereed > Publication in refereed journalVersion of RecordPublishe

The effect of magnetic stimulation on potential rhythm of cerebral cortex

An approach using magnetic stimulation to modulate the electromagnetic potential rhythm of the cerebral cortex to induce sleep is proposed. Animal experiments were designed and carried out to examine this approach. The results showed that, in comparison with a control group, magnetic stimulation can influence and modulate the activities of brain potentials, and consequently promote the efficiency of the sleep process (p<0.01).published_or_final_versio

Adipose tissue-derived stem cells in oral mucosa tissue engineering: Enhanced migration and proliferation in co-culture with oral keratinocytes in vitro

Tissue-engineered oral mucosa holds a great prospect in urethroplasty and adipose tissue-derived stem cells (ADSCs) may play an important role in this field. In this research, canine oral keratinocytes (OKs) and ADSCs were harvested and cultured in vitro. The affinity between the two cell lines was evaluated by analyzing their migration and proliferation patterns in a co-culture environment. The results demonstrate that both canine ADSCs and OKs showed improved migration in the presence of the other cell line as a co-culture when compared to monoculture. Further, conditioned medium using the supernatant of one cell line accelerated the other cell line’s proliferation rate. Hence, it was concluded that the affinity between OKs and ADSCs was fitting; the presence of ADSCs accelerated the migration and proliferation of OKs in vitro. These results indicate that it is practical to use ADSCs and OKs to construct a tissue-engineered oral mucosa, since the presence of the former could activate the latter in vitro, maybe even in vivo. This may help to build tissue-engineered oral mucosa, which may be a new method for urethroplasty.Key words: Urethroplasty, adipose tissue-derived stem cells, oral keratinocytes, tissue engineering

SQG-Differential Evolution for difficult optimization problems under a tight function evaluation budget

In the context of industrial engineering, it is important to integrate efficient computational optimization methods in the product development process. Some of the most challenging simulation-based engineering design optimization problems are characterized by: a large number of design variables, the absence of analytical gradients, highly non-linear objectives and a limited function evaluation budget. Although a huge variety of different optimization algorithms is available, the development and selection of efficient algorithms for problems with these industrial relevant characteristics, remains a challenge. In this communication, a hybrid variant of Differential Evolution (DE) is introduced which combines aspects of Stochastic Quasi-Gradient (SQG) methods within the framework of DE, in order to improve optimization efficiency on problems with the previously mentioned characteristics. The performance of the resulting derivative-free algorithm is compared with other state-of-the-art DE variants on 25 commonly used benchmark functions, under tight function evaluation budget constraints of 1000 evaluations. The experimental results indicate that the new algorithm performs excellent on the 'difficult' (high dimensional, multi-modal, inseparable) test functions. The operations used in the proposed mutation scheme, are computationally inexpensive, and can be easily implemented in existing differential evolution variants or other population-based optimization algorithms by a few lines of program code as an non-invasive optional setting. Besides the applicability of the presented algorithm by itself, the described concepts can serve as a useful and interesting addition to the algorithmic operators in the frameworks of heuristics and evolutionary optimization and computing

Frequency domain regression method to calculate response factors of multilayer walls

2000-2001 > Academic research: refereed > Publication in refereed journalVersion of RecordPublishe