Search

Abstract Background The traditional Chinese dentistry classroom teaching model focuses on the instruction of knowledge details, but less on the frameworks and learners’ motivation. Here, we introduced a combination of mind mapping and PBL instruction (MBL)into the prosthodontics course for Chinese dental students. This study aimed to evaluate the effectiveness and efficiency of MBL in prosthodontics and make observations from the students’ perspectives, based on their response with the learning process. Methods We prospectively enrolled 56 fourth-year undergraduates of stomatology, and these participants were randomly allocated into either the combined mind map teaching group (MBL) or the problem-based learning group (PBL) to attend the prosthodontics course. An anonymous questionnaire was also administered to both groups to evaluate the students’ perceptions and experiences, using closed and open-ended items. Data were analyzed using descriptive statistics and thematic analysis. Results The students’ responses to closed items indicate their experience in PBL and MBL to be positive, including increased motivation, improved memory of knowledge, enhanced discipline connection and raised teamwork, with fairly higher ratings for the MBL group. However, the tutor-guided competence scores including the memory and framework part, were significantly higher for MBL group than PBL group (two-way ANOVA, p

Link prediction aims at predicting the missing links or new links based on known topological or attribute information of networks, which is one of the most significant and challenging tasks in complex network analysis. Recently, many local similarity-based methods have been proposed and they performed well in most cases. However, most of these methods simultaneously ignore the contributions of the local structure information between endpoints and their common neighbors, as well as transmission abilities of different 3-hop paths. To address these issues, in this paper, we propose a novel link prediction method that aims at improving the prediction accuracy of the existing local similarity-based methods by integrating with local structure information and node degree information along 3-hop paths. Extensive experiments have been performed on nine real-world networks and the results demonstrate that our proposed method is superior to the existing state-of-the-art methods. [ABSTRACT FROM AUTHOR]

Purpose: The author proposed a friction plunge micro-welding (FPMW) method and applied it to column grid array packaging to realize the connection of copper columns without precision molds assisted positioning. The purpose of this paper is to study the flow behavior of the solder undergoing frictional thermo-mechanical action during the FPMW and to determine the source of the solders in the micro-zones with different microstructure characteristics near the solder/Cu column friction interface. Design/methodology/approach: Three kinds of Sn58Bi/SAC305 and SAC305/Pb90Sn composite solder samples were designed to study the flow behavior of the solder during FPMW using Bi and Pb as tracer elements. Findings: The results show that most of the solders in the position occupied by the copper column was softened and plasticized during the welding process and was extruded to side of the copper column, flowing axially, circumferentially and radially along a trajectory similar to a conical spiral line. Under the drive of the tangential friction force and the radial hold-tight force, the extruded out visco-plastic solders fully mixed with the visco-plastic solders on the sides of the copper column, and bonded with the solders that deformed plastically on the periphery, so that a stir zone and a dynamic recrystallization zone finally evolved. The outside plastically deformed solders evolved into a thermo-mechanical affected zone. Originality/value: The flow behavior of the solder during the FPMW was determined, as well as the source of the solders in micro-zones with different microstructure characteristics. [ABSTRACT FROM AUTHOR]