News & Archives

Publications

Optimizing Budget Allocation for Low-Volume Roads Through the AHP-TOPSIS Approach

Evaluates an AHP–TOPSIS framework for rural-road maintenance prioritization using 724 one-kilometer road sections across eight regional bureaus in Thailand. Compared with conventional allocation under the same budget, the study reports 7.4% greater maintenance coverage and lower regional variation in post-maintenance roughness.

Suranaree Journal of Science and Technology, 33(4), 010450 (1–15) · Publication record

Preprints

YOLO26-RD: An End-to-End Road Damage Detection Network With Learnable Contrast Enhancement and Edge-Guided Downsampling

A pavement-distress detector informed by an audit of road-survey imagery. LearnableContrast adjusts local contrast, while EdgeSPD uses edge information during downsampling. The study compares five model scales with matched baselines; its findings are reported in an arXiv preprint.

arXiv:2608.15713v2 · Preprint · Revised 18 August 2026 · Revised preprint

Publications

Ethical Appetite: The Market Dynamics of Price Premiums for Animal Welfare-Friendly Food Products

Examines associations between animal-welfare labels and food prices using Swiss supermarket data, considering both consumer preferences and production costs.

Research on World Agricultural Economy, 7(3) · Online publication

Activities & knowledge exchange

Pawarotorn shares digital infrastructure practice

Infra Plus reports Pawarotorn Chaipetch’s participation as its representative in an Engineering Expo panel on field data, GIS, AI and infrastructure management.

Infra Plus / International Engineering Expo 2026 · Source report date

Publications

A Comparative Performance Study of Conventional Hot Mix Asphalt Concrete and Plastic Waste-Modified Hot Mix Asphalt Concrete

Compares conventional asphalt concrete and recycled-plastic-modified mixtures using laboratory and field tests of stiffness, moisture resistance, rutting and fatigue.

Road and Airfield Pavement Technology · ICPT 2025, Lecture Notes in Civil Engineering 771, 847–858 · Publication record

Publications

Diffusion-Based Synthetic Augmentation with Quality-Aware Reference Selection and mAP-Guided Allocation for Enhancing Vehicle Detection Robustness

Studies diffusion-based synthetic data augmentation for vehicle detection, using quality-aware reference selection and mAP-guided allocation. Citation and authorship are verified from ACM-deposited metadata; the full text was not accessible in this scan.

Proceedings of the 3rd Asia Symposium on Image and Graphics (ASIG 2025), 51–63 · Online April 2026 · Online publication

Activities & knowledge exchange

Weerachai and Nuntawat mentor co-op students at Infra Plus

In their company roles, Weerachai Wongweeranimit and Nuntawat Lersinghanart provided feedback at Infra Plus’s co-operative education project presentations.

Infra Plus · Event date

Activities & knowledge exchange

ThaiRAP reports highway assessments and training

iRAP reports ThaiRAP support for 18,129 km of highway assessments, training for 124 Department of Highways staff, and a separate road-safety workshop for 45 students.

ThaiRAP / Department of Highways · Source report date

Publications

Enhancing Highway Traffic Volume Surveys in Thailand with Image Processing and Machine Learning

A camera-based traffic survey device detects, counts and classifies vehicles into 13 Department of Highways categories. Image processing and machine learning support automated traffic-volume collection.

Proceedings of the 14th Asia-Pacific Conference on Transportation and the Environment (APTE 2025), 188–198 · Online publication

Publications

Exploring Key Determinants of Traffic Accidents Fatalities in Thailand: A Hybrid Approach Machine Learning and Statistics

Statistical association measures and a convolutional deep-learning model examine factors linked to fatalities in Thai highway crash records. The study highlights safety equipment, road-user type and lighting conditions.

Proceedings of the 14th Asia-Pacific Conference on Transportation and the Environment (APTE 2025), 116–126 · Online publication

Publications

Role of Safety Awareness in Promoting E-Scooter Rental Services: Evidence from Bangkok

A survey of 234 participants at Chulalongkorn University combines factor analysis and logistic regression to examine how safety awareness relates to recommending rental e-scooter services.

Proceedings of the 14th Asia-Pacific Conference on Transportation and the Environment (APTE 2025), 127–136 · Online publication

Activities & knowledge exchange

Weerachai’s geographical association appointment announced

Infra Plus announced Weerachai Wongweeranimit’s appointment to the Geographical Association of Thailand executive board for 2025–2027.

Infra Plus / Geographical Association of Thailand · Source report date

Publications

Crash severity prediction using a virtual geometry-group-based deep learning approach with images-based feature representation

A VGG-based convolutional model predicts crash severity from Thai highway records for 2011–2023. Categorical features become grayscale images, with class balancing and Bayesian optimisation; evaluation uses F1-score and AUC.

Results in Engineering, 27, 106155 · Publication record

Publications

Accounting of the Overburden Pressure on Analysis of Down-Hole Seismic Shear Wave Velocity

Compares four ways to interpret down-hole seismic measurements at three Thai sites, examining how overburden pressure affects inferred soil velocities.

Engineering Journal · Online publication

Publications

Overloaded truck problem in Thailand: Investigating Root Causes, Enforcement Gaps, and Policy Solutions

Examines truck overloading in Thailand through bridge weigh-in-motion data and enforcement evidence, linking infrastructure monitoring with transport policy.

Case Studies on Transport Policy · Publication record

Publications

Fiscal Implications of Government’s Collective VGF Support in Multiple PPP Toll Roads in Bangladesh

Assesses the government funding needed to make three PPP toll-road projects in Bangladesh financially viable, comparing alternative grant schedules with the national budget.

Proceedings of 7th International Conference on Civil Engineering and Architecture, Volume 2, LNCE 641, 199–211 · Online publication

Publications

A Multi-Criteria Decision Support System for Prioritizing Road Maintenance: Integrating AHP and TOPSIS with a Focus on Low-Volume Roads

Combines AHP factor weighting with TOPSIS ranking to prioritize road maintenance. Economic, engineering, environmental and social criteria help account for low-volume roads that traffic and roughness measures alone may overlook. The study evaluates the decision-support approach on a Thai rural-road network.

IOP Conference Series: Earth and Environmental Science, 1450(1), 012004 · Publication record

Preprints

The Green Premium Puzzle: Empirical Evidence from Climate-Friendly Food Products

This preprint analyses Swedish supermarket products and finds no general price premium for better climate-impact scores after accounting for product characteristics.

arXiv:2507.10333 — preprint, not peer reviewed · Publication record

Publications

Derivation of Shear Wave Velocity Profiles from Explosion-Induced Seismic Waves

Tests a simpler interpretation of explosion-generated seismic data against MASW at five Thai sites. Accuracy varies with changes in soil layers.

Engineering Journal · Publication record

Publications

Conformal Prediction for Uncertainty Quantification and Reliable HER2 Status Classification in Breast Cancer IHC Images

Studies conformal prediction for quantifying uncertainty in HER2 status classification from breast-cancer immunohistochemistry images.

IEEE Access, 13, pp. 51645–51659 · Publication record

Publications

A Fused Deep Learning Expert System for Road Damage Detection and Size Analysis Using YOLO9tr and Depth Estimation

Conference paper combining YOLO9tr and depth estimation for detecting road damage and analysing its size. Bibliographic details follow IEEE’s Crossref deposit.

2024 International Conference on Intelligent Computing and Next Generation Networks (ICNGN), 1–5 · Publication record

Publications

Ideal performance assessment of non-recirculating anaerobic fluidized bed reactors treating low to high strength organic loads with low retention time

Evaluates anaerobic fluidised bed reactors containing PVA media over 240 days, varying organic loading and hydraulic retention time without internal recirculation.

Process Biochemistry · Publication record

Activities & knowledge exchange

Industry experts join Chula asphalt-materials teaching

On 2 and 4 September, Tipco specialists taught third-year Civil Engineering Materials students; Boonchai Sangpetngam joined the experience-sharing sessions.

Chula Civil Engineering / Tipco Asphalt · Event date

Publications

YOLO9tr: a lightweight model for pavement damage detection utilizing a generalized efficient layer aggregation network and attention mechanism

A lightweight pavement-damage detector based on YOLOv9 with partial attention. The study evaluates accuracy and inference speed using road images from multiple countries and an expanded set of damage classes. The journal article and its earlier arXiv version are grouped as one work.

Journal of Real-Time Image Processing, 21, Article 163 · Online publication

Activities & knowledge exchange

Boonchai presents a recycled-asphalt prototype with Tipco

Boonchai Sangpetngam and a Tipco Asphalt representative presented research combining reclaimed asphalt concrete with waste palm oil rejuvenator at SCI Power for Future Thailand.

Chula Civil Engineering / Tipco Asphalt · Event date

Publications

A comparative study of road traffic violation between Thai and Japanese teenagers

Uses questionnaire responses from Bangkok and Sapporo with structural equation modelling to compare factors associated with teenage road-user violations and identify context-specific safety measures.

IATSS Research, 48(1), 55–67 · Publication record

Publications

The Develop Testing of Field CBR Testing Tools

Evaluates a modified field CBR test assembly, comparing test results, variability and operating time with conventional equipment.

Journal of Educational Innovation and Research, 8(3), 1181–1196 · Publication record

Publications

An Evaluation of the Accuracy of GNSS Receivers Integrated with MEMS-IMU Sensors for Optimal Angle Determination in Tilted Observation Scenarios Using the NRTK GNSS Technique in Thailand

Tests GNSS receivers with inertial sensors at different pole tilts and levels of obstruction to evaluate positioning accuracy under NRTK surveying.

Engineering Journal, 28(11), pp. 99–109 · Publication record

Publications

Precision Road Infrastructure Management: Monocular Vision-Based 3D Damage Detection and Assessment

Combines YOLO9tr damage detection with calibrated monocular depth estimation to assess pavement damage using a vehicle-mounted camera. The conference manuscript investigates both damage classification and dimensional measurement, extending the detector toward road-maintenance assessment.

The 3rd International Conference on Advance Civil Engineering and Smart Structure · Author-uploaded conference manuscript, November 2024 · Publication record

Publications

Parasitic Egg Detection and Classification in Low-Cost Microscopic Images Using Transfer Learning

Evaluates transfer learning with AlexNet and ResNet50 to locate and classify parasite eggs in images from a low-cost USB microscope.

SN Computer Science, 5, 82 · Online publication

Publications

Influence of PPP Transportation Projects on Socio-Economic Development in Thailand and Impact of COVID-19 on PPP Projects

Case studies of two urban rail systems and two tollways examine socio-economic benefits and pandemic-related financial risks in Thai public–private partnerships.

Revisiting Public-Private Partnerships: Lessons from COVID-19, 173–193 · Online publication

Activities & knowledge exchange

ThaiRAP reports highway and Bangkok assessment work

The Chulalongkorn-led programme reported highway and motorway assessments, alongside road-safety assessment and capacity-building collaboration with BMA.

ThaiRAP / iRAP · Source report date

Publications

Applying synchrotron radiation-based attenuated total reflection-fourier transform infrared to chemically characterise organic functional groups in terrestrial soils of King George Island, Antarctica

Uses synchrotron-based infrared spectroscopy to characterise organic functional groups in soil samples from King George Island, Antarctica.

Heliyon, 9(9), e19711 · Publication record

Publications

GNSS rover receivers’ horizontal positioning accuracy assessments based on NRTK-VRS surveying

Assesses GNSS rover horizontal positioning accuracy for network-RTK virtual-reference-station surveying, with relevance to cadastral measurements in Thailand.

Survey Review, 56(395), pp. 191–199 · Online publication

Publications

Passengers’ Intentions to Use Public Transport during the COVID-19 Pandemic: A Case Study of Bangkok and Jakarta

Structural equation models compare how service quality, passenger confidence and health measures relate to bus-use intentions in Bangkok and Jakarta during the pandemic.

Sustainability, 15(6), 5273 · Online publication

Publications

Geometric and Statistical Assessments on Horizontal Positioning Accuracy in Relation with GNSS CORS Triangulations of NRTK Positioning Services in Thailand

Assesses how reference-station geometry and spacing relate to horizontal positioning accuracy across Thailand’s NRTK-VRS network.

International Journal of Geoinformatics, 19(2), pp. 1–9 · Online publication

Publications

Best Practice for Mapping Production from UAV Imagery

Investigates processing and quality assessment for UAV mapping using imagery acquired over the Chulalongkorn UAV test field.

Engineering Journal of Research and Development, 34(1) · Publication record

Publications

3D reconstruction of proximal femoral fracture from biplanar radiographs with fractural representative learning

Develops FracReconNet to reconstruct fractured proximal femurs in 3D from two radiographic views, using fracture representations and training-data augmentation.

Scientific Reports, 13, 455 · Online publication

Publications

Investigating informal transport travelers’ heterogeneity: A case study of Silor in Bangkok, Thailand

Surveys across five Silor routes in Bangkok compare travel patterns and service perceptions among users and non-users. Statistical classification identified four user groups with different needs and expectations.

Kasetsart Journal of Social Sciences, 45(1), 235–246 · Online publication

Publications

MANet: a multi-attention network for automatic liver tumor segmentation in computed tomography (CT) imaging

In a medical-imaging collaboration, introduces MANet: a U-Net-based network with residual learning and channel and spatial attention for liver-tumour segmentation in CT images.

Scientific Reports, 13, 20098 · Publication record

Publications

Development of Model for Predicting the Flexible Pavement Strength

A pavement-strength prediction study relates base materials, repeated axle loads, temperature and season to structural condition. Model outputs are compared with falling-weight deflectometer measurements from actual roads.

28th National Convention on Civil Engineering (NCCE 28), TRL69, 1–10 · Publication record

Publications

Estimation of Highway Maintenance Costs due to Heavy Truck Traffic

HDM-4 simulations use Highway 344 data to examine pavement damage and maintenance costs over 20 years for four heavy-truck categories. The analysis supports exploration of maintenance-based truck charges.

28th National Convention on Civil Engineering (NCCE 28), TRL75, 1–6 · Publication record

Publications

Impacts of human resource management and knowledge management on non-financial organizational performance: Evidence of Thai infrastructure construction firms

A structural equation model evaluates relationships among human-resource practices, knowledge management and non-financial performance in Thai infrastructure construction firms. Knowledge management is examined as a mediating factor.

Ain Shams Engineering Journal, 13(6), 101750 · Publication record

Publications

A study of human resource management and knowledge management influencing the performance of Thai infrastructure contractors

Structural equation modelling examined relationships between human resource practices, knowledge management and the performance of Thai infrastructure contractors. The analysis found positive links between these organisational factors in the firms studied.

Journal of Engineering and Innovation, 15(4), 1–10 · Publication record

Publications

An Empirical Examination of Knowledge Management and Organizational Learning as Mediating Variables between HRM and Sustainable Organizational Performance

Partial least-squares structural equation modelling examines how knowledge management and organisational learning mediate links between human-resource practices and sustainable performance in Thai construction firms.

Sustainability, 14(20), 13351 · Online publication

Publications

A Case Study of Multi-head Camera Systems on UAV for the Generation of High-quality 3D Mapping

Develops and tests geometric calibration for a five-camera UAV rig using a controlled survey field.

Engineering Journal of Research and Development, 33(4), 89–105 · Publication record

Publications

Factors Influencing Battery Electric Vehicle Adoption in Thailand—Expanding the Unified Theory of Acceptance and Use of Technology’s Variables

An online survey of 403 participants in Bangkok and nearby areas was analysed using structural equation modelling. The study examined how technology acceptance and environmental concern relate to battery-electric vehicle purchase intentions and use.

Sustainability, 14(14), 8482 · Online publication

Activities & knowledge exchange

ThaiRAP receives the Prime Minister’s road-safety award

Kasem Choocharukul received the award on behalf of ThaiRAP during the 15th National Road Safety Seminar.

ThaiRAP / National Road Safety Seminar · Event date

Publications

Permanent Deformation Behavior under Repeated Load of Recycled Material Stabilized with Bitumen Emulsion

Repeated-load tests examined permanent deformation in recycled pavement materials treated with bitumen emulsion and cement. The laboratory results offer guidance for designing recycled pavement rehabilitation materials.

Engineering Journal, 26(4), 13–23 · Publication record

Publications

Analytical of Multi-Criteria Approach for Identifying the Weight and Factor of Rural Road Maintenance Prioritization

Uses the Analytic Hierarchy Process to weight economic, engineering and social factors for rural-road maintenance. It relates priorities to the Department of Rural Roads’ strategic objectives, including network connectivity and the needs of low-traffic routes.

International Journal of GEOMATE, 22(91), 70–79 · Publication record

Publications

Achievement of the Development of Highway Bridge Building Management After the Completion of the Project

Uses questionnaires and interviews to examine factors affecting the outcomes of completed highway bridge construction projects.

Journal of Buddhist Anthropology, 7(2), 186–201 · Publication record

Publications

Object Detection of Road Assets Using Transformer-Based YOLOX with Feature Pyramid Decoder on Thai Highway Panorama

Combines a Vision Transformer backbone with YOLOX and a feature-pyramid decoder to detect roadside assets in Thai highway images.

Information, 13(1), 5 · Online publication

Activities & knowledge exchange

Kasem contributes to a WHO road-safety discussion

iRAP reports an interview with Kasem Choocharukul, as ThaiRAP Lead, on the WHO–Royal Thai Government road-safety cooperation strategy.

iRAP / ThaiRAP · Source report date

Publications

Computational Framework for the Determination of Duration and Revenue Sharing Rates in PPP Concession Renewal: A Monte Carlo and Risk Premium Approach

Uses Monte Carlo simulation and a risk-premium approach to evaluate concession duration and revenue sharing when renewing a PPP toll-road contract.

Engineering Journal, 25(7), 59–71 · Publication record

Publications

Preliminary Design for Segmental Joint of Precast Tunnel Liner

Presents preliminary calculations for bolted and unbolted tunnel-lining joints, connecting joint flexural capacity with stiffness reduction and segment arrangement.

Civil and Environmental Engineering · Online publication

Publications

Vehicle Axle Load Identification Using Extracted Bridge Influence Line via Updated Static Component Technique

Combines a measured bridge influence line with iterative load estimation. Simulations and scaled experiments assess accuracy under road roughness and measurement noise.

Engineering Journal · Publication record

Publications

Skid resistance of Asphalt Hot-mix Recycling

Examines skid resistance and polishing performance of asphalt mixtures with different proportions of reclaimed asphalt pavement.

Naresuan University Engineering Journal, 16(1), 53–63 · Publication record