Wilfred W. F. Lau

Exploring the effects of gender and learning styles on computer programming performance: implications for programming pedagogy

Computer programming has been taught in secondary schools for more than two decades. However, little is known about how students learn to program. From the curriculum implementation perspectives, learning style helps address the issue of learner differences, resulting in a shift from a teacher-centred approach to a learner-focused approach. This study aims to investigate the effects of gender and learning styles on computer programming performance. The Gregorc Style Delineator (GSD) was employed to measure learning styles. A test was administered to assess students’ programming performance. Two hundred and seventeen secondary school students of age from 14 to 19 participated in this study. Results indicated that no gender differences in programming performance were found after controlling for the effect of student ability. Academic ability had a differential effect on programming knowledge. Sequential learners in general performed better than random learners. These results suggest the importance of the ordering dimension of the GSD in influencing programming performance. Implications of the findings in relation to programming pedagogy are discussed in this paper. [ABSTRACT FROM AUTHOR]

Modelling programming performance: Beyond the influence of learner characteristics

In the 21st century, the ubiquitous nature of technology today is evident and to a large extent, most of us benefit from the modern convenience brought about by technology. Yet to be technology literate, it is argued that learning to program still plays an important role. One area of research in programming concerns the identification of predictors of programming success. Previous studies have identified a number of predictors. This study examined the effect of a combination of predictors (gender, learning styles, mental models, prior composite academic ability, and medium of instruction) on programming performance. Data were collected anonymously through a website from 131 secondary school students in Hong Kong who opted for computer programming in the Computer and Information Technology curriculum. Partial Least Squares (PLS) modelling was used to test a hypothesized theoretical structural model. All of the five aforementioned variables were either direct or indirect predictors of programming performance and the antecedents accounted for 43.6% of the variance in programming performance. While this study shows the influence of learner characteristics such as gender, learning styles, and mental models on programming performance, it highlights the effect that prior composite academic ability and medium of instruction exert on learning outcomes, which is uncommon among studies of similar purpose. These findings have significant implications for policy makers and educators alike.

Adolescents' risky online behaviours: The influence of gender, religion, and parenting style

This study explored the influence of gender, religion, and parenting style on risky online behaviours in a sample of 825 Secondary 2 students in Hong Kong. Three risky online behaviours, namely, unauthorised acts (UNAC), internet stickiness (INST), and plagiarism (PLAG) were examined. It was found that males tended to be involved in more risky online behaviours than did females. Christians were no different from non-Christians in terms of risky online behaviours. Parenting style did not seem to be effective in reducing risky online behaviours. There was some evidence that gender moderated the relationship between risky online behaviours and parenting style. Taken together, gender, religion, and parenting style predicted risky online behaviours significantly. Implications of the findings are discussed.

Immediate Tracheoesophageal puncture for voice restoration in laryngopharyngeal resection

A 2-year prospective study on primary tracheoesophageal puncture was carried out to evaluate the morbidity of the procedure and its success in restoring speech. Fifty-two patients, 36 of whom suffered from carcinoma of the larynx and 16, carcinoma of the hypopharynx, were entered into the study. Thirty-three patients underwent total laryngectomy with primary pharyngeal closure, 14 patients had, in addition, pharyngectomy and pectoralis major myocutaneous flap reconstruction, and 5 patients had pharyngolaryngoesophagectomy and gastric transposition. Tracheoesophageal or tracheogastric speech was successful in 58, 86, and 80 percent, respectively. Manometric studies showed that the neopharyngeal sphincter pressure decreased in all instances, but a correlation between the neopharyngeal pressure and the success of tracheoesophageal speech was not demonstrable. The morbidity rate related to tracheoesophageal puncture was low. Therefore, we believe it to be a safe and feasible procedure that can facilitate early voice restoration.

Prospective screening for multiple tumors of the upper aerodigestive tract: a simple routine procedure.

Detection of a second primary at the time of initial work‐up of patients with head and neck cancers has an important bearing on management planning. In a 12‐month period, a series of 105 patients with an index head and neck primary (skin malignancies excluded) of the squamous cell type were subjected to the following screening procedure. Under topical anesthesia, with the patient in the sitting position, a small‐size flexible bronchofiberscope (Olympus B3R) was introduced through the nose. As the scope was advanced, the nasal cavity, nasopharynx, oropharynx, hypopharynx, and larynx were examined. The tracheobronchial tree was also examined if the chest x‐ray showed abnormal findings. The endoscope was then passed down to examine the esophagus, with oxygen insufflated via the biopsy channel at a rate of 1 liter per minute.

Tumor clearance at resection margins in total laryngectomy. A clinicopathologic study

The specimens from total laryngectomy performed in 70 patients were studied using the step‐serial whole organ sectioning technique. Transverse histologic sections were taken and examined for minimum tumor clearance. The clinical status of patients for at least 4 years of observation was correlated with microscopic clearance of margins. The actual presence of tumor at the margins of resection was found in 21 (30%) of the specimens. The tumor was found to reach within 1 mm, 2 mm, and more than 2 mm from the margins in nine (13%), four (6%), and 36 (51%) specimens, respectively. The anterolateral margin was most commonly involved (19%), followed by the posterolateral (11%), postcricoid (7%), and upper (1.4%) margins. Local recurrence was found to be related to degree of clearance as 10 of 21 (48%) patients with no clearance and one of nine (11%) with 1 mm clearance had local failure. None of the patients with 2 mm clearance or more developed local recurrence. It is concluded that step‐serial whole organ sectioning is an adequate method for thoroughly examining resection margins in laryngectomy specimens.

Effects of social media usage and social media multitasking on the academic performance of university students

In todays society, social media have become an almost indispensable part of daily life, particularly among university students, who are generally heavy social media users. Social media multitasking has also been increasingly prevalent. Little, however, is known about how social media usage and social media multitasking influence the academic performance of university students. This study examined whether and how these two behaviors predict academic performance among university students. From a sample of 348 undergraduate students at a comprehensive university in Hong Kong, this study found that using social media for academic purposes was not a significant predictor of academic performance as measured by cumulative grade point average, whereas using social media for nonacademic purposes (video gaming in particular) and social media multitasking significantly negatively predicted academic performance. Effects of social media usage and social media multitasking on cumulative GPA were examined.Participants were 348 undergraduate students at a comprehensive university in Hong Kong.Academic use of social media did not predict cumulative GPA.Video gaming and social media multitasking negatively predicted cumulative GPA.

Treatment of neck nodes in oral cancer

In a review of 98 patients who were operated upon for squamous oral cancer, a high proportion of them (48%) developed recurrence after a minimum follow-up of 2 years. Nodal status significantly affected the nodal recurrence rate and survival. For N0, N1, N3 tumours, the 2-year nodal recurrence-free rates were 79, 83, 18%, and the 2-year survival rates were 58, 59 and 10%. For small tumours with N0 neck, the group with elective neck dissection and the observed group did not have statistically different nodal recurrence-free rate and overall survival. The 2-year nodal recurrence-free rate was 92% versus 77% (P value > 0.3) and the 2-year survival rate was 56% versus 72% (P value > 0.6). In patients with N1 neck, radical neck dissection was reasonably effective in controlling neck metastasis. Radical neck dissection in an attempt to treat fixed neck nodes (N3) was not successful in controlling the neck disease.

Reconstruction of hypopharyngeal defects in cancer surgery: Do we have a choice?☆

Abstract Between 1982 and 1985, 83 patients with hypopharyngeal or extensive laryngeal cancers underwent pharyngoesophagectomy (48 patients), circumferential pharyngectomy (8 patients), and partial pharyngectomy (27 patients), depending on the site and extent of tumor involvement. The resultant hypopharyngeal defects were reconstructed with gastric transposition, a tubed pectoralis major myocutaneous flap, and a pectoralis major flap patch, respectively. There were three hospital deaths in the gastric transposition group (6 percent) and none in both pectoralis major flap groups. The leakage rate was 8.3 percent in the gastric transposition group, 25 percent in the tubed pectoralis major flap group, and 3.7 percent in the pectoralis major flap patch group. Stricture was avoided with the interdigitation technique used at the tubed-flap-to-esophagus anastomosis, although the fistula rate was high. The overall complication rate was higher with gastric transposition. Although swallowing was satisfactory in all three groups, 42 percent of the patients with gastric transposition experienced regurgitation. Over a follow-up period of 16 to 50 months the local recurrence rate was 5 percent, and the actuarial survival rate was 55 percent at 24 months.

The impact of the medium of instruction: The case of teaching and learning of computer programming

Despite the seemingly good prospects in the Information Technology (IT) industry, the expected number of students who are interested in the relevant subjects has been limited. While numerous studies have explored the influence of various variables on programming course participation and performance at a personal level, there have been few studies conducted at a policy level. This study examined the impact of the medium of instruction (MOI) on student learning of computer programming in Hong Kong. It also examined the effects of gender and prior academic ability on programming performance. No gender differences in programming performance were found in the sample after prior academic ability was controlled. Prior academic ability affected performance differentially. Chinese-medium instructed students tended to outperform their English-medium instructed counterparts and middle and low-ability students in English-medium schools were notably at-risk. In view of these results, we argue that the MOI issue is further complicated by student ability. This provides a new understanding of the impact of the MOI on student learning. At a policy level, the results offer empirical evidence for policy-makers to rethink the current MOI policy. At a school level, we propose some metacognitive and cognitive strategies to address the needs of those at-risk learners. Finally, we intend to raise a series of questions that warrant further discussion and investigation.