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Information Sciences Institute

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Selected work

Representative Papers

Gender Attribution in Causal Beliefs

Aug 22, 2026

研究使用Twitter数据和语言模型分析了性别归因在因果关系表达中的差异,揭示了女性常被关联负面情绪及人际关系问题,而男性则更多与正面情绪及结构性影响相关。

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"If It Looks Like a User": Measuring Real-Time Moderation Effects via Social Media Simulation

Aug 17, 2026

This study addresses the overestimation of real-time efficacy in static social media moderation assessments by constructing an empirically calibrated agent-based simulation framework. Utilizing CMA-ES evolutionary strategies to optimize parameters and replicate authentic statistical characteristics, this work quantitatively reveals for the first time how compensatory user reposting significantly undermines governance effectiveness in dynamic moderation environments. The findings confirm that actual moderation performance falls below static estimates due to these adaptive user behaviors. Consequently, this research proposes a high-fidelity simulation methodology that overcomes traditional evaluation biases, providing a reliable dynamic benchmark and theoretical foundation for optimizing content moderation strategies.

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When Chatbots Accommodate: What AI Companions Optimize for in Vulnerable Conversations

Jun 03, 2026

Existing moderation approaches struggle to uncover the true response strategies of AI companion chatbots when users express vulnerability, as they focus narrowly on predefined crisis triggers while overlooking decision-making dynamics in ongoing interactions. This work proposes the first vulnerability–response pairing classification framework tailored for long-term dialogues and leverages inverse reinforcement learning on approximately 48,000 real conversational turns to infer the implicit optimization objectives of GPT-4.1, Character.AI, and Replika. The analysis reveals that GPT-4.1 tends to offer advice, Character.AI exhibits dispersed strategies, and Replika consistently asks questions while maintaining presence. All three systems avoid corrective friction and dynamically adapt their responses based on user risk level and relational intimacy, thereby transcending the limitations of conventional output-level moderation.

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BioTamperNet: Affinity-Guided State-Space Model Detecting Tampered Biomedical Images

Feb 01, 2026

This work addresses the challenge that existing image forensic methods, trained primarily on natural images, struggle to effectively detect subtle copy-paste manipulations in biomedical images, thereby compromising the integrity of scientific data. To this end, we propose BioTamperNet, a novel framework that, for the first time, integrates affinity-guided self-attention and cross-attention mechanisms with a lightweight linear attention module inspired by state space models. This architecture enables end-to-end precise localization of both tampered regions and their corresponding source regions. Evaluated on standard biomedical image forensics benchmarks, BioTamperNet significantly outperforms current state-of-the-art methods, demonstrating superior accuracy and fine-grained detection capability.

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Latest Papers

Gender Attribution in Causal Beliefs

Aug 22, 2026

研究使用Twitter数据和语言模型分析了性别归因在因果关系表达中的差异,揭示了女性常被关联负面情绪及人际关系问题,而男性则更多与正面情绪及结构性影响相关。

0 citationsRead paper

"If It Looks Like a User": Measuring Real-Time Moderation Effects via Social Media Simulation

Aug 17, 2026

This study addresses the overestimation of real-time efficacy in static social media moderation assessments by constructing an empirically calibrated agent-based simulation framework. Utilizing CMA-ES evolutionary strategies to optimize parameters and replicate authentic statistical characteristics, this work quantitatively reveals for the first time how compensatory user reposting significantly undermines governance effectiveness in dynamic moderation environments. The findings confirm that actual moderation performance falls below static estimates due to these adaptive user behaviors. Consequently, this research proposes a high-fidelity simulation methodology that overcomes traditional evaluation biases, providing a reliable dynamic benchmark and theoretical foundation for optimizing content moderation strategies.

0 citationsRead paper

When Chatbots Accommodate: What AI Companions Optimize for in Vulnerable Conversations

Jun 03, 2026

Existing moderation approaches struggle to uncover the true response strategies of AI companion chatbots when users express vulnerability, as they focus narrowly on predefined crisis triggers while overlooking decision-making dynamics in ongoing interactions. This work proposes the first vulnerability–response pairing classification framework tailored for long-term dialogues and leverages inverse reinforcement learning on approximately 48,000 real conversational turns to infer the implicit optimization objectives of GPT-4.1, Character.AI, and Replika. The analysis reveals that GPT-4.1 tends to offer advice, Character.AI exhibits dispersed strategies, and Replika consistently asks questions while maintaining presence. All three systems avoid corrective friction and dynamically adapt their responses based on user risk level and relational intimacy, thereby transcending the limitations of conventional output-level moderation.

0 citationsRead paper

BioTamperNet: Affinity-Guided State-Space Model Detecting Tampered Biomedical Images

Feb 01, 2026

This work addresses the challenge that existing image forensic methods, trained primarily on natural images, struggle to effectively detect subtle copy-paste manipulations in biomedical images, thereby compromising the integrity of scientific data. To this end, we propose BioTamperNet, a novel framework that, for the first time, integrates affinity-guided self-attention and cross-attention mechanisms with a lightweight linear attention module inspired by state space models. This architecture enables end-to-end precise localization of both tampered regions and their corresponding source regions. Evaluated on standard biomedical image forensics benchmarks, BioTamperNet significantly outperforms current state-of-the-art methods, demonstrating superior accuracy and fine-grained detection capability.

0 citationsRead paper