Publications and works

Open-source tools

ThoughtDAGAC

Thinking with AI on an infinite canvas.

Extended with researchers at the Max Planck Institute for Intelligent Systems in TraceVista.

Features and demos

TextFoldC

Read at the level of detail you need.

Features and demos

Dissertation

ABCBeyond predictions: alignment between prior knowledge and machine learning for human-centric augmented intelligence

Chen, X. Doctoral dissertation, Leibniz University Hannover, 2024

The dissertation behind the first three alignments: decision-making process, methodological paradigm and interaction pattern alignment.

A · Decision-making process alignment

AFront-Loading Cost Estimation in Early-Stage BIM Design

Jang, S., Chen, X., & Borrmann, A. Computing in Civil Engineering 2026, 2026

Brings cost estimation forward into early-stage BIM design.

ABWorkflow-Oriented Convex Decomposition of 2D Building Geometry

Dalach, A., Chen, X., & Borrmann, A. In Proceedings of the 33rd International Workshop on Intelligent Computing in Engineering (EG-ICE), 2026

Convex decomposition of 2D building geometry, organised around the engineering workflows that use it.

AEvaluation of Building Design Variants in Early Phases on the Basis of Adaptive Detailing Strategies

Napps, D., Staudt, J., Saluz, U., Chen, X., Steiner, D., Zong, C., Deghim, F., Lang, W., Geyer, P., Schnellenbach-Held, M., Petzold, F., Borrmann, A., & König, M. Buildings, 2026

Evaluates building design variants in early phases, when information is incomplete, on the basis of adaptive detailing strategies.

AA holistic two-stage decision-making methodology for passive and active building design strategies under uncertainty

Zong, C., Chen, X., Deghim, F., Staudt, J., Geyer, P., & Lang, W. Building and Environment, 2024

Organises passive and active building design decisions into two stages and carries their uncertainty through both.

ASustainability recommendation system for process-oriented building design alternatives under multi-objective scenarios

Chen, X., & Geyer, P. In Proceedings of 30th International Workshop on Intelligent Computing in Engineering, EG-ICE 2023, 2023

This manuscript introduces a recommendation system as an application extension practice for machine assistance in the sustainable building design domain. By involving multi-objective optimization processes, this system aims to be the bridge...

ABIntegrated data-driven and knowledge-based performance evaluation for machine assistance in building design decision support

Chen X., Saluz U., Staudt J., Margesin M., Lang W., & Geyer P. In Proceedings of 29th International Workshop on Intelligent Computing in Engineering, EG-ICE 2022, special issue, 2022

This research implements a practice of the integration between a data-driven model and knowledge-based methods within the same context in the early phases of building design. The objective is to enhance decision-making...

AMachine assistance in energy-efficient building design: A predictive framework toward dynamic interaction with human decision-making under uncertainty

Chen, X., & Geyer, P. Applied Energy, 2022

Drawing inspiration from the human nervous system’s estimation process, we present a key framework designed to revolutionize how we approach complex decision-making challenges across various domains. This framework seamlessly integrates uncertainty quantification,...

B · Methodological paradigm alignment (prior knowledge)

BA heterogeneous dataset of European building energy models and simulation results for surrogate modeling

Dalach, A., Chen, X., & Geyer, P. Scientific Data (under review)

A heterogeneous dataset of European building energy models and simulation results, organised for surrogate modelling.

ABFrom 'What-is' to 'What-if' in Human-Factor Analysis: A Post-Occupancy Evaluation Case

Chen, X., Sun, R., Geyer, P., Borrmann, A., & Schiavon, S. Building and Environment, 2026

In complex human-centric systems, we may lose ourselves optimizing for symptoms rather than causes. Most analytical methods are designed to answer "what-is" (descriptive) questions, yet we often apply them to "what-if" (interventional)...

BIntegrating symbolic neural networks with building physics: A study and proposal

Chen, X., Lv, G., Zhuang, X., Roa, C. D., Schiavon, S., & Geyer, P. Journal of Building Engineering, 2025

Explores Kolmogorov–Arnold Networks (KAN) for symbolic learning in building physics, demonstrating improved interpretability, robustness under data scarcity, and potential for physics-informed knowledge discovery.

BCExplainable AI for engineering design: A unified approach of systems engineering and component-based deep learning

Geyer, P., Singh, M. M., & Chen, X. Advanced Engineering Informatics, 2024

Introducing a groundbreaking intersection of systems engineering and deep learning: our component-based, data-driven model. This unique approach not only adapts to the inherent structure of systems engineering but also prioritizes domain knowledge,...

BComponent-based machine learning modeling for predicting building energy performance – An overview

Geyer, P., Chen, X., & Nabavi, S. A. In Proceedings of BauSim 2024, 10th Conference of IBPSA-Germany and Austria, 2024

An overview of component-based machine learning for predicting building energy performance.

BUtilizing domain knowledge: robust machine learning for building energy performance prediction with small, inconsistent datasets

Chen, X., Singh, M.M. & Geyer, P. Knowledge-Based Systems, 2024

In the engineering domain, most systems are composed of the same basic components with diverse compositions. By disentangling the compositionality from the system and embedding it into the model organization, we actually...

BMachine learning in proton exchange membrane water electrolysis — A knowledge-integrated framework

Chen, X., Rex, A., Woelke, J., Eckert, C., Bensmann, B., Hanke-Rauschenbach, R., & Geyer, P. Applied Energy, 2024

This paper demonstrates the general applicability of the knowledge-integration machine learning framework. It is showcased through real-world PEMWE case studies, highlighting its potential to drive sustainable energy solutions and pave the way...

BFeasibility Analysis of POD and Deep-autoencoder for Indoor Environment CFD Prediction

Wang, S., Chen, X., & Geyer, P. In Proceedings of the 18th International IBPSA Conference, Building Simulation 2023, 2023

Compares proper orthogonal decomposition and deep autoencoders as reduced representations for indoor-environment CFD prediction.

BPerformance investigation of different topology organizations in district heating systems with component-based machine learning

Guo, T., Chen, X., Geyer, P., & Kriegel, M. In Proceedings of the 18th International IBPSA Conference, Building Simulation 2023, 2023

Component-based machine learning to compare topology organisations of district heating systems.

BPathway toward prior knowledge-integrated machine learning in engineering

Chen, X., & Geyer, P. In Proceedings of 18th International IBPSA conference and Exhibition, Building Simulation 2023, 2023

Proposing a paradigm to systematically embed prior knowledge and domain insights into data-driven models, addressing domain-specific challenges through three levels of knowledge integration: modeling knowledge for system description, inductive logic and disentanglement...

ABIntroducing causal inference in the energy-efficient building design process

Chen, X., Abualdenien, J., Singh, M. M., Borrmann, A., & Geyer, P. Energy and Buildings, 2022

In the design and decision-making process, distinguishing between correlation and causation is not just a philosophical mindset but a crucial methodological consideration. As we transition from intuition-driven decisions to data-driven methodologies, it’s...

BA hybrid-model forecasting framework for reducing the building energy performance gap

Chen, X., Guo, T., Kriegel, M., & Geyer, P. Advanced Engineering Informatics, 2022

An intuitive way to combine knowledge-based simulation for data enrichment while introducing extra information to machine learning models. This hybrid-model framework ensures that both domain knowledge and data are well utilized, reducing...

ABA Dynamic Feedforward Control Strategy for Energy-efficient Building System Operation

Chen X., Cai X., Kümpel A., Müller D., & Geyer P. In Proceedings of Passive and Low Energy Architecture, PLEA 2022, 2022

Leveraging the confluence of simulation, first-principles models, and machine learning, we introduce a pioneering approach that marries the strengths of feedforward and feedback loops. Think of it as a reinforcement learning paradigm:...

BA hybrid-model forecasting framework for reducing the building energy performance gap

Chen, X., Guo, T., & Geyer, P. In Proceedings of 28th International Workshop on Intelligent Computing in Engineering, EG-ICE 2021, special issue, 2021

Introducing a cutting-edge approach to bridging the persistent energy performance gap in the building industry: By synergistically merging domain knowledge from building simulations with the prowess of machine learning, our hybrid-model forecasting...

BComponent-based machine learning for predicting representative time-series of energy performance in building design

Chen, X., Singh, M.M. & Geyer, P. In Proceedings of 28th International Workshop on Intelligent Computing in Engineering, EG-ICE 2021, 2021

Imagine building performance prediction as a dynamic Lego set, where each block represents a distinct component of the design. Just as Lego pieces can be assembled in countless ways to create varied...

C · Interaction pattern alignment (communication)

ACContext Repair for LLMs: Pilot v2

Chen, X. Research report, ThoughtDAG, 2026

How a wrong claim keeps steering an LLM conversation after its source turn is deleted, and which graph edits remove it, tested on nine model endpoints with exact-match scoring.

ABCUsing causal inference to avoid fallouts in data-driven parametric analysis: A case study in the architecture, engineering, and construction industry

Chen, X., Sun, R., Saluz, U., Schiavon, S., & Geyer, P. Developments in the Built Environment, 2023

This research proposes a symbiosis pattern between human intelligence and machine capabilities with the importance of causal analysis in preventing biases in data-driven models and prior knowledge: the necessity of understanding the...

BCToward reliable signals decoding for electroencephalogram: A benchmark study to EEGNeX

Chen, X., Teng, X., Chen, H., Pan, Y., & Geyer, P. Biomedical Signal Processing and Control, 2023

Are the limits of our language the limits of our world? Just as we use words to share ideas, our brains have their own unique language, spoken through electrical signals. To better...

D · Fundamental mechanism alignment

DConstraint Breeds Generalization: Temporal Dynamics as an Inductive Bias

Chen, X. arXiv preprint, 2025

Proposes that physical constraints in biological systems shape dynamics to function not as limitations, but as a temporal inductive bias that breeds generalization. Through phase-space analysis, reveals a fundamental asymmetry between expansive...

DDynamical Alignment: A Principle for Adaptive Neural Computation

Chen, X. Neuromorphic Computing and Engineering, 2025

Reveals a universal adaptive computation principle in spiking neural networks, showing that matching input temporal structure to neuronal timescales produces two computational modes: dissipative (efficient) and expansive (high-performance), allowing fixed architectures to...

Other

欧盟-德国建筑碳中和前沿; Frontiers of carbon neutrality in EU-German building sector

Chen X., Zhang Y., & Cai X. 暖通空调; Heating Ventilating & Air Conditioning, 2022

A thorough overview of carbon neutrality in the EU regarding policy framework, technology support, economics foundation, and recycling strategy.