Effects of different evaluative feedback on students' self-efficacy in learning

Two studies examined the effects of four types of teachers' evaluative feedback on Chinese students' self-efficacy in English vocabulary acquisition. In Study 1, a random sample of Grade 8 students (N = 79) learned prefixes and received either formative or summative feedback after failure in test. The results showed that students who received summative feedback showed a larger decrease in their self-efficacy than those who received formative feedback. In Study 2, a random sample of Grade 7 students (N = 77) went through similar procedures as in Study 1 except that students received either self-referenced or norm-referenced feedback. The results showed that self-referenced feedback was more beneficial to students' self-efficacy than norm-referenced feedback. The influences of teachers' evaluation and feedback on students' self-efficacy are discussed. © Springer Science+Business Media B.V. 2008.postprin

The Chinese classroom paradox: A cross-cultural comparison of teacher controlling behaviors

postprin

Inter-disciplinary service learning - housing for the community

2014-2015 > Academic research: refereed > Refereed conference paperVersion of RecordPublishe

A dual colour dual fusion fluorescence in situ hybridisation study on the genesis of complex variant translocations in chronic myelogenous leukaemia

Complex variant 9;22 translocations occur in a significant minority of chronic myelogenous leukaemia (CML) patients. Different mechanisms of their formation have been described. We report dual colour dual fusion fluorescence in situ hybridisation data in 12 Chinese CML patients with complex translocations. Three previously reported breakpoint hotspots in a third partner chromosome (14q32, 17q25, 1q2l) were observed. In 10/12 (83.3%) patients, the abnormality occurred as a single step 3-break event. Only a single abnormal clone harbouring the complex translocation was seen in this group. The remaining 2 cases in the chronic phase showed a 4-break mechanism (2/12,16.7%). Deletion of 5' ABL at der(9) was not observed in any of the 12 patients, however, the loss of 3' BCR was observed in 1 patient (1/12, 8.3%). Together with previous findings, these data suggest that these variant translocations occur more often as a 3-break single-step process with no reciprocal ABL-BCR fusion. On the other hand, a 4-break event is also regularly seen during the initial stages of leukaemogenesis, which likely predisposes to der(9) deletion. The observed difference in rates of der(9) deletion reported in a series of CML patients with variant translocations may be related to a difference in rates of a 4-break event.published_or_final_versio

A matrix-pencil approach to blind separation of non-white sourcesin white noise

The problem of blind source separation in additive white noise is an important problem in speech, array and acoustic signal processing. In general this problem requires the use of higher order statistics of the received signals. However for many signal sources, such as speech with distinct non-white power spectral densities, second order statistics of the received signal mixture can be exploited for signal separation. While previous approaches often assume that additive noise is absent or that the noise correlation matrix is known, we propose a simple and yet effective signal extraction method for signal source separation under unknown white noise. This new and unbiased signal extractor is derived from the matrix pencil formed between output auto-correlation matrices at different delays. Simulation examples are presented.published_or_final_versio

A matrix-pencil approach to blind separation of colored nonstationary signals

For many signal sources such as speech with distinct, nonwhite power spectral densities, second-order statistics of the received signal mixture can be exploited for signal separation. Without knowledge on noise correlation matrix, we propose a simple and yet effective signal extraction method for signal source separation under unknown temporally white noise. This new and unbiased signal extractor is derived from the matrix pencil formed between output autocorrelation matrices at different delays. Based on the matrix pencil, an ESPRIT-type algorithm is derived to get an optimal solution in least square sense. Our method is well suited for systems with colored sensor noises and for nonstationary signals. © 2000 IEEE.published_or_final_versio

Common association of haemolytic uraemic syndrome with invasive Streptococcus pneumoniae infection in five Chinese paediatric patients

Haemolytic uraemic syndrome is an important cause of acute renal impairment in childhood. We review the incidence, and clinical and laboratory features of haemolytic uraemic syndrome in a Chinese population. Five patients were identified from 2006 to 2008. All patients were young children with associated invasive Streptococcus pneumoniae pulmonary infection. Serotypes 3, 14, and 19A were confirmed in four patients. The classical post-diarrhoeal form associated with Escherichia coli (O157:H7) infection was not seen. One patient died of acute respiratory failure. Streptococcus pneumoniae infection, as an associated condition in haemolytic uraemic syndrome, is important and relatively common in Chinese patients, especially among children. The acute clinical picture is similar to that reported in the western literature, except for an uncommon association with meningitis. The medium-term renal outcome of the Chinese population appears to be more favourable than the Caucasians. Widespread vaccination against Streptococcus pneumoniae may have resulted in changes in bacterial epidemiology and clinicians should be continuously aware of this severe disease. The use of washed blood components for transfusion in the acute stage requires further study.published_or_final_versio

电脑辅助及远程认知康复的发展与应用

2003-2004 > Academic research: refereed > Publication in refereed journalVersion of RecordPublishe

An evaluation study of a gender-specific smoking cessation program to help Hong Kong Chinese women quit smoking

published_or_final_versio

Experience of using bevacizumab in epithelial ovarian, fallopian tube and primary peritoneal cancers in a single centre

Objectives: To review the use of bevacizumab in epithelial ovarian, fallopian tube and primary peritoneal cancers in our centre. Methods: Patients receiving bevacizumab for epithelial ovarian, fallopian tube and primary peritoneal cancer at the Division of Gynaecological Oncology, Queen Mary Hospital, The University of Hong Kong between January 2011 and December 2015 were included. A retrospective chart review was performed. Main outcome measures were adverse events and progression-free survival. Results: Overall, 41 patients received bevacizumab for epithelial ovarian, fallopian tube or primary peritoneal cancer, of which 24 were for primary treatment and 17 for recurrent disease. Of 24 patients who received bevacizumab as primary treatment, the median age was 52 years, and 12.5% of the patients had early-stage high-risk disease, 87.5% had FIGO stage III or IV disease, 45.8% had a serous adenocarcinoma, and 54.2% had residual disease after debulking surgery. Of 17 patients who received bevacizumab for recurrent disease, the median age was 52 years, and 94.1% of the patients were having their first recurrence, 64.7% had platinum-sensitive disease and 41.2% had a serous adenocarcinoma. Grade 2 or higher hypertension and proteinuria occured in 24.4% and 12.2% of patients, respectively. Bevacizumab was discontinued in 7.3% of patients due to adverse events and 31.7% due to inadequate therapeutic response. The median progression free survival was 18.0 months (95% CI 13.6 to 22.4) for primary treatment and 11.0 months (95% CI 8.4 to 13.6) for recurrent disease. Conclusions: With acceptable toxicity, combination of bevacizumab and chemotherapy may be considered as treatment modality in newly diagnosed suboptimally debulked stage III or stage IV ovarian cancer as well as in recurrent ovarian cancer.postprin