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Xiang Shao

Publications and source records attributed to Xiang Shao.

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ROSClaw: A Hierarchical Semantic-Physical Framework for Heterogeneous Multi-Agent Collaboration

The integration of large language models (LLMs) with embodied agents has improved high-level reasoning capabilities; however, a critical gap remains between semantic understanding and physical execution. While vision-language-action (VLA) and vision-language-navigation (VLN) systems enable robots to perform manipulation and navigation tasks from natural language instructions, they still struggle with long-horizon sequential and temporally structured tasks. Existing frameworks typically adopt modular pipelines for data collection, skill training, and policy deployment, resulting in high costs in experimental validation and policy optimization. To address these limitations, we propose ROSClaw, an agent framework for heterogeneous robots that integrates policy learning and task execution within a unified vision-language model (VLM) controller. The framework leverages e-URDF representations of heterogeneous robots as physical constraints to construct a sim-to-real topological mapping, enabling real-time access to the physical states of both simulated and real-world agents. We further incorporate a data collection and state accumulation mechanism that stores robot states, multimodal observations, and execution trajectories during real-world execution, enabling subsequent iterative policy optimization. During deployment, a unified agent maintains semantic continuity between reasoning and execution, and dynamically assigns task-specific control to different agents, thereby improving robustness in multi-policy execution. By establishing an autonomous closed-loop framework, ROSClaw minimizes the reliance on robot-specific development workflows. The framework supports hardware-level validation, automated generation of SDK-level control programs, and tool-based execution, enabling rapid cross-platform transfer and continual improvement of robotic skills. Ours project page: https://www.rosclaw.io/.

cs.RO

Flexible Bidding in Service-Oriented Combinatorial Spectrum Forward Auctions

Traditional combinatorial spectrum auctions mainly rely on fixed bidding and matching processes, which limit participants' ability to adapt their strategies and often result in suboptimal social welfare in dynamic spectrum sharing environments. To address these limitations, we propose a novel approximately truthful combinatorial forward auction scheme with a flexible bidding mechanism aimed at enhancing resource efficiency and maximizing social welfare. In the proposed scheme, each buyer submits a combinatorial bid consisting of the base spectrum demand and adjustable demand ranges, enabling the auctioneer to dynamically optimize spectrum allocation in response to market conditions. To standardize the valuation across heterogeneous frequency bands, we introduce a Spectrum Equivalent Mapping (SEM) coefficient. A greedy matching algorithm is employed to determine winning bids by sorting buyers based on their equivalent unit bid prices and allocating resources within supply constraints. Simulation results demonstrate that the proposed flexible bidding mechanism significantly outperforms existing benchmark methods, achieving notably higher social welfare in dynamic spectrum sharing scenarios.

cs.GT