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Zhigang Lu

7 accepted papers

2026

Approximation Algorithm for Constrained k-Center Clustering: A Local Search Approach

AAAI 2026technical

Clustering is a long-standing research problem and a fundamental tool in AI and data analysis. The traditional k-center problem, known as a fundamental theoretical challenge in clustering, has a best possible approximation ratio of 2, and any improvement to a ratio of 2 - ε would imply P = NP. In th

Cited by 0SourcePDFScholar
2026

GARNET: GoT-Based Alert Reduction and Narrative Event Tracing

AAAI 2026technical

Alerts generated by Security Operations Centers (SOCs) are often numerous and scattered, requiring significant effort from security analysts to manage, which severely slows response times. While recent alert correlation graph methods can effectively reduce alert volume, these graphs are often too co

Cited by 0SourcePDFScholar
2026

Optimized Algorithms for Text Clustering with LLM-Generated Constraints

AAAI 2026technical

Clustering is a fundamental tool that has garnered significant interest across a wide range of applications including text analysis. To improve clustering accuracy, many researchers have proposed incorporating background knowledge, typically in the form of must‑link and cannot‑link constraints, to

Cited by 0SourcePDFScholar
2026

Sentient: Detecting APTs via Capturing Indirect Dependencies and Behavioral Logic

AAAI 2026technical

Advanced Persistent Threats (APTs) are difficult to detect due to their complexity and stealthiness. To mitigate such attacks, many approaches model entities and their relationship using provenance graphs to detect the stealthy and persistent characteristics of APTs. However, existing detection meth

Cited by 0SourcePDFScholar
2025

DCASI: A Sequence-based Attack Investigation Method Using DTW Contrastive Learning

ICASSP 2025accepted

The stealth and persistence of APT attacks make investigation particularly challenging, further complicated by the diversity and volume of host logs. Existing methods, though effective, have limitations: 1) They rely heavily on manual processing and complex models that often fail to capture temporal…

Cited by 0SourceScholar
2025

One Head to Rule Them All: Amplifying LVLM Safety through a Single Critical Attention Head

NeurIPS 2025poster

Large Vision-Language Models (LVLMs) have demonstrated impressive capabilities in tasks requiring multimodal understanding. However, recent studies indicate that LVLMs are more vulnerable than LLMs to unsafe inputs and prone to generating harmful content. Existing defense strategies primarily includ…

Cited by 0SourcecodeScholar
2024

Efficient Constrained K-center Clustering with Background Knowledge

AAAI 2024technical

Center-based clustering has attracted significant research interest from both theory and practice. In many practical applications, input data often contain background knowledge that can be used to improve clustering results. In this work, we build on widely adopted k-center clustering and model its…