2025-06-22

Thesis: Ontology-based multi-source heterogeneous O&M data integration framework for tunnel structural health assessment has been published in the journal Structure and Infrastructure Engineering.

As a typical representative of infrastructure, tunnels are indispensable carriers for the normal operation of cities, with their safe and efficient operation directly influencing urban efficiency. However, the various data supporting tunnel operation and maintenance (O&M) exhibit significant diverse sources and structural differences, which pose substantial challenges to tasks such as tunnel structural health assessment. To address these challenges, this paper proposes an ontology-based multi-source heterogeneous O&M data integration framework to support the assessment of tunnel structural health, thereby improving decision-making efficiency in tunnel maintenance. The framework consists of four layers: data layer, ontology layer, mapping layer, and application layer, enabling the unified modeling, integration, and comprehensive application of multi-source heterogeneous tunnel O&M data. Additionally, the proposed framework is applied to a practical engineering project, the Tanglang Mountain Tunnel. Compared with existing methods, the framework demonstrates improvements in data fusion accuracy, data completeness, and operational efficiency.

Note: Structure and Infrastructure Engineering is a journal in the field of engineering technology in the Q2 zone, with an impact factor of 2.6. The first author of the paper is Liu Longxiang, a master's student, and I am the corresponding author. The research results were funded by the National Key Research and Development Program of China .

2025-06-14

On June 14th, the research group held a team-building activity aimed at bidding farewell to the graduating students and enhancing the team's cohesion at the same time.

This team-building activity was carefully planned and rich in content. At the beginning of the event, the members participated in an immersive live-action theater murder mystery game, engaging in team reasoning and competition among four camps, fully demonstrating their wisdom and spirit of collaboration. The evening dinner party was filled with a warm and lively atmosphere, interspersed with interactive games including those about teamwork and fun challenges, with laughter and joy never ceasing. At the end of the event, the graduates shared their unforgettable experiences in the team and expressed their gratitude. Everyone also presented them with graduation blessings and gifts. I also delivered a brief speech, thanking everyone for their hard work and expressing my beautiful expectations for the future development of the team.

This team-building activity not only relaxed both the body and mind but also strengthened the bonds among the members. The event concluded successfully with a group photo as a memento. The research group wishes the graduates a bright future!

2025-06-11

The citation count of "Web-oriented BIM 3D Viewing and Information Management" on China National Knowledge Infrastructure (CNKI) has reached 100 times.

BIM Server provides a solution for BIM to support construction life cycle. Currently , the structure of BIM Server is C/S, but gradually B/S also shows its advantages. The release of the HTML5 standard brings the WebCL technology which supports hardware graphics acceleration in browser and is one of a series of revolutionary Web technologies. Thereby the foundation is laidfor achieving Web-oriented BIM infomation management and 3D display of BIM model. In this paper, the model information scope and its expression of Web-oriented BIM is ana-lyzed, and the corresponding information management technology and the BIM model display based on the Three. js, which is a WebCL framework, are studied. Then, a WebCL-based platform for 3D display and information management of BIM is also developed. Application shows that the graphics platform of the platform performs stable with nice rendering for large BIM. Meanwhile the platform provides rich feature supports for Web client by favorable interactive functions, showing a great application value.

Journal of Information Technology in Civil Engineering and Architecture was founded in 2009. It is a national first-class journal sponsored by the China Graphics Society and under the supervision of the China Association for Science and Technology. Wang Hengwei is the first author of the paper. The other authors include Associate Researcher Lin Jiarui and Professor Zhang Jianping from the Department of Civil Engineering at Tsinghua University.

2025-05-24

The paper "Fluid flow and heat transfer characteristics of manifold microchannel heat sinks with ribs of different shapes" has been published in the Journal International Journal of Heat and Mass Transfer.

Manifold Microchannel Heat Sink (MCHS) is an effective device to dissipate the heat generated from the chips with large-scale circuits. Although it is found that adding ribs to the microchannels of the traditional MCHS improves its performance in heat dissipation, there is no systematic study to investigate the effect of adding ribs to the manifold MCHS. The pressure drops, mean temperatures, the Nusselt number, the heat enhancement efficiency, the characteristics of flows and heat transfers have been studied numerically in the manifold MCHS with five different shaped ribs and compared to the smooth manifold MCHS in this paper. The comparison shows that the development of boundary layers in the flow and temperature fields is interrupted by the ribs, which leads to an enhancement in heat dissipation. Compared to the smooth manifold MCHS, the ribs reduce the temperature of the substrate bottom by 9.2%-25.1% and the Nusselt numbers are increased by 11.5%-45.2%. However, the ribs in the microchannels increase the pressure drops by 55.7%-111.4%. As the Reynolds number increases, the influence of ribs on these key indicators becomes more pronounced. Through the computational analysis of the thermal enhancement efficiency, it is found that benefits of adding ribs overwhelms at higher Reynolds number (exceeds 200). The elliptical ribs are recommended among the different rib shapes under investigation and the heat enhancement efficiency achieves a maximum value of 1.17 when the Reynolds number is 450.

Note: The International Journal of Heat and Mass Transfer belongs to the Q1 zone of engineering and technology journals, with an impact factor of 5.0. The first author of the paper is Chen Shoujun from the Institute for Ocean Engineering. Teacher Li Sunwei is the corresponding author. The research results were supported by the Guangdong Basic and Applied Basic Research Foundation.  The authors acknowledge the support from the Tsinghua Shenzhen International Graduate School - Shenzhen Pengrui Young Faculty Program of Shenzhen Pengrui Foundation.

2025-05-16

Congratulations to Liu Longxiang on successfully passing the master's thesis defense at Tsinghua University!

The title of Liu Longxiang's paper is "Research and Application of Tunnel Multi-Source Heterogeneous O&M Data Fusion Based on Ontology". This research takes multi-source heterogeneous operation and maintenance data of tunnels as the research object, introduces ontology semantic web technology, and integrates and utilizes various tunnel operation and maintenance data resources. Firstly, this study constructed a classification system for tunnel operation and maintenance data. For different types of tunnel operation and maintenance data, domain ontology models were established respectively in different ways to achieve the unification of data formats. Subsequently, this study proposed an ontology mapping strategy based on comprehensive similarity to achieve efficient and accurate mapping among ontology models of different operation and maintenance data. Finally, a healthy operation and maintenance strategy for tunnel structures is proposed, including steps such as application ontology construction, mapping and semantic query, structural health assessment, and maintenance strategy selection. In addition, this study also developed a multi-source heterogeneous operation and maintenance data management platform for tunnels and applied it in the actual engineering project of Tanglangshan Tunnel in Shenzhen City, achieving good results.